* [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
@ 2019-08-13 10:53 Donald Kuo
2019-08-15 2:45 ` [edk2-devel] " Dong, Eric
0 siblings, 1 reply; 20+ messages in thread
From: Donald Kuo @ 2019-08-13 10:53 UTC (permalink / raw)
To: devel; +Cc: Ray Ni, Star Zeng, Eric Dong, Amy Chan, Rangasai V Chaganty
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1909
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Amy Chan <amy.chan@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Signed-off-by: Donald Kuo <donald.kuo@intel.com>
---
UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c | 41 +++
UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf | 35 +++
UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni | 17 ++
UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c | 274 +++++++++++++++++++++
UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c | 81 ++++++
UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf | 37 +++
UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni | 17 ++
UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c | 58 +++++
UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf | 36 +++
UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni | 17 ++
UefiCpuPkg/UefiCpuPkg.dec | 8 +
UefiCpuPkg/UefiCpuPkg.dsc | 3 +
12 files changed, 624 insertions(+)
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
new file mode 100644
index 0000000000..6ddf917bad
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
@@ -0,0 +1,41 @@
+/** @file
+ CPUID Leaf 0x15 for Core Crystal Clock frequency instance as Base Timer Library.
+
+ Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+
+/**
+ CPUID Leaf 0x15 for Core Crystal Clock Frequency.
+
+ The TSC counting frequency is determined by using CPUID leaf 0x15. Frequency in MHz = Core XTAL frequency * EBX/EAX.
+ In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if not supported.
+ @return The number of TSC counts per second.
+
+**/
+UINT64
+CpuidCoreClockCalculateTscFrequency (
+ VOID
+ );
+
+/**
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+InternalGetPerformanceCounterFrequency (
+ VOID
+ )
+{
+ return CpuidCoreClockCalculateTscFrequency ();
+}
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
new file mode 100644
index 0000000000..fd93adc5f1
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
@@ -0,0 +1,35 @@
+## @file
+# Base CPU Timer Library
+#
+# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+# counter features are provided by the processors time stamp counter.
+#
+# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = BaseCpuTimerLib
+ FILE_GUID = F10B5B91-D15A-496C-B044-B5235721AA08
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = TimerLib|SEC PEI_CORE PEIM
+ MODULE_UNI_FILE = BaseCpuTimerLib.uni
+
+[Sources]
+ CpuTimerLib.c
+ BaseCpuTimerLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ PcdLib
+ DebugLib
+
+[Pcd]
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ## CONSUMES
diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
new file mode 100644
index 0000000000..fcf2b0fbcb
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
@@ -0,0 +1,17 @@
+// /** @file
+// Base CPU Timer Library
+//
+// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+// counter features are provided by the processors time stamp counter.
+//
+// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "CPU Timer Library"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Provides basic timer support using CPUID Leaf 0x15 XTAL frequency."
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
new file mode 100644
index 0000000000..0b9e9384f5
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
@@ -0,0 +1,274 @@
+/** @file
+ CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer Library.
+
+ Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+#include <Library/PcdLib.h>
+#include <Library/DebugLib.h>
+#include <Register/Cpuid.h>
+
+GUID mCpuCrystalFrequencyHobGuid = { 0xe1ec5ad0, 0x8569, 0x46bd, { 0x8d, 0xcd, 0x3b, 0x9f, 0x6f, 0x45, 0x82, 0x7a } };
+
+/**
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+InternalGetPerformanceCounterFrequency (
+ VOID
+ );
+
+/**
+ CPUID Leaf 0x15 for Core Crystal Clock Frequency.
+
+ The TSC counting frequency is determined by using CPUID leaf 0x15. Frequency in MHz = Core XTAL frequency * EBX/EAX.
+ In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if not supported.
+ @return The number of TSC counts per second.
+
+**/
+UINT64
+CpuidCoreClockCalculateTscFrequency (
+ VOID
+ )
+{
+ UINT64 TscFrequency;
+ UINT64 CoreXtalFrequency;
+ UINT32 RegEax;
+ UINT32 RegEbx;
+ UINT32 RegEcx;
+
+ //
+ // Use CPUID leaf 0x15 Time Stamp Counter and Nominal Core Crystal Clock Information
+ // EBX returns 0 if not supported. ECX, if non zero, provides Core Xtal Frequency in hertz.
+ // TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX.
+ //
+ AsmCpuid (CPUID_TIME_STAMP_COUNTER, &RegEax, &RegEbx, &RegEcx, NULL);
+
+ //
+ // If EBX returns 0, the XTAL ratio is not enumerated.
+ //
+ ASSERT (RegEbx != 0);
+ //
+ // If ECX returns 0, the XTAL frequency is not enumerated.
+ //
+ if (RegEcx == 0) {
+ CoreXtalFrequency = PcdGet64 (PcdCpuCoreCrystalClockFrequency);
+ } else {
+ CoreXtalFrequency = (UINT64) RegEcx;
+ }
+
+ //
+ // Calculate TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX
+ //
+ TscFrequency = DivU64x32 (MultU64x32 (CoreXtalFrequency, RegEbx) + (UINT64)(RegEax >> 1), RegEax);
+
+ return TscFrequency;
+}
+
+/**
+ Stalls the CPU for at least the given number of ticks.
+
+ Stalls the CPU for at least the given number of ticks. It's invoked by
+ MicroSecondDelay() and NanoSecondDelay().
+
+ @param Delay A period of time to delay in ticks.
+
+**/
+VOID
+InternalCpuDelay (
+ IN UINT64 Delay
+ )
+{
+ UINT64 Ticks;
+
+ //
+ // The target timer count is calculated here
+ //
+ Ticks = AsmReadTsc() + Delay;
+
+ //
+ // Wait until time out
+ // Timer wrap-arounds are NOT handled correctly by this function.
+ // Thus, this function must be called within 10 years of reset since
+ // Intel guarantees a minimum of 10 years before the TSC wraps.
+ //
+ while (AsmReadTsc() <= Ticks) {
+ CpuPause();
+ }
+}
+
+/**
+ Stalls the CPU for at least the given number of microseconds.
+
+ Stalls the CPU for the number of microseconds specified by MicroSeconds.
+
+ @param[in] MicroSeconds The minimum number of microseconds to delay.
+
+ @return MicroSeconds
+
+**/
+UINTN
+EFIAPI
+MicroSecondDelay (
+ IN UINTN MicroSeconds
+ )
+{
+
+ InternalCpuDelay (
+ DivU64x32 (
+ MultU64x64 (
+ MicroSeconds,
+ InternalGetPerformanceCounterFrequency ()
+ ),
+ 1000000u
+ )
+ );
+
+ return MicroSeconds;
+}
+
+/**
+ Stalls the CPU for at least the given number of nanoseconds.
+
+ Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
+
+ @param NanoSeconds The minimum number of nanoseconds to delay.
+
+ @return NanoSeconds
+
+**/
+UINTN
+EFIAPI
+NanoSecondDelay (
+ IN UINTN NanoSeconds
+ )
+{
+
+ InternalCpuDelay (
+ DivU64x32 (
+ MultU64x64 (
+ NanoSeconds,
+ InternalGetPerformanceCounterFrequency ()
+ ),
+ 1000000000u
+ )
+ );
+
+ return NanoSeconds;
+}
+
+/**
+ Retrieves the current value of a 64-bit free running performance counter.
+
+ Retrieves the current value of a 64-bit free running performance counter. The
+ counter can either count up by 1 or count down by 1. If the physical
+ performance counter counts by a larger increment, then the counter values
+ must be translated. The properties of the counter can be retrieved from
+ GetPerformanceCounterProperties().
+
+ @return The current value of the free running performance counter.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounter (
+ VOID
+ )
+{
+ return AsmReadTsc ();
+}
+
+/**
+ Retrieves the 64-bit frequency in Hz and the range of performance counter
+ values.
+
+ If StartValue is not NULL, then the value that the performance counter starts
+ with immediately after is it rolls over is returned in StartValue. If
+ EndValue is not NULL, then the value that the performance counter end with
+ immediately before it rolls over is returned in EndValue. The 64-bit
+ frequency of the performance counter in Hz is always returned. If StartValue
+ is less than EndValue, then the performance counter counts up. If StartValue
+ is greater than EndValue, then the performance counter counts down. For
+ example, a 64-bit free running counter that counts up would have a StartValue
+ of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
+ that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
+
+ @param StartValue The value the performance counter starts with when it
+ rolls over.
+ @param EndValue The value that the performance counter ends with before
+ it rolls over.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounterProperties (
+ OUT UINT64 *StartValue, OPTIONAL
+ OUT UINT64 *EndValue OPTIONAL
+ )
+{
+ if (StartValue != NULL) {
+ *StartValue = 0;
+ }
+
+ if (EndValue != NULL) {
+ *EndValue = 0xffffffffffffffffULL;
+ }
+ return InternalGetPerformanceCounterFrequency ();
+}
+
+/**
+ Converts elapsed ticks of performance counter to time in nanoseconds.
+
+ This function converts the elapsed ticks of running performance counter to
+ time value in unit of nanoseconds.
+
+ @param Ticks The number of elapsed ticks of running performance counter.
+
+ @return The elapsed time in nanoseconds.
+
+**/
+UINT64
+EFIAPI
+GetTimeInNanoSecond (
+ IN UINT64 Ticks
+ )
+{
+ UINT64 Frequency;
+ UINT64 NanoSeconds;
+ UINT64 Remainder;
+ INTN Shift;
+
+ Frequency = GetPerformanceCounterProperties (NULL, NULL);
+
+ //
+ // Ticks
+ // Time = --------- x 1,000,000,000
+ // Frequency
+ //
+ NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency, &Remainder), 1000000000u);
+
+ //
+ // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.
+ // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should < 2^(64-30) = 2^34,
+ // i.e. highest bit set in Remainder should <= 33.
+ //
+ Shift = MAX (0, HighBitSet64 (Remainder) - 33);
+ Remainder = RShiftU64 (Remainder, (UINTN) Shift);
+ Frequency = RShiftU64 (Frequency, (UINTN) Shift);
+ NanoSeconds += DivU64x64Remainder (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);
+
+ return NanoSeconds;
+}
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
new file mode 100644
index 0000000000..2d0ef6ab07
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
@@ -0,0 +1,81 @@
+/** @file
+ CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer Library.
+
+ Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+#include <Library/HobLib.h>
+
+extern GUID mCpuCrystalFrequencyHobGuid;
+
+/**
+ CPUID Leaf 0x15 for Core Crystal Clock Frequency.
+
+ The TSC counting frequency is determined by using CPUID leaf 0x15. Frequency in MHz = Core XTAL frequency * EBX/EAX.
+ In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if not supported.
+ @return The number of TSC counts per second.
+
+**/
+UINT64
+CpuidCoreClockCalculateTscFrequency (
+ VOID
+ );
+
+//
+// Cached CPU Crystal counter frequency
+//
+UINT64 mCpuCrystalCounterFrequency = 0;
+
+
+/**
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+InternalGetPerformanceCounterFrequency (
+ VOID
+ )
+{
+ return mCpuCrystalCounterFrequency;
+}
+
+/**
+ The constructor function is to initialize CpuCrystalCounterFrequency.
+
+ @param ImageHandle The firmware allocated handle for the EFI image.
+ @param SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+DxeCpuTimerLibConstructor (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_HOB_GUID_TYPE *GuidHob;
+
+ //
+ // Initialize CpuCrystalCounterFrequency
+ //
+ GuidHob = GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid);
+ if (GuidHob != NULL) {
+ mCpuCrystalCounterFrequency = *(UINT64*)GET_GUID_HOB_DATA (GuidHob);
+ } else {
+ mCpuCrystalCounterFrequency = CpuidCoreClockCalculateTscFrequency ();
+ }
+
+ return EFI_SUCCESS;
+}
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
new file mode 100644
index 0000000000..6c83549c87
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
@@ -0,0 +1,37 @@
+## @file
+# DXE CPU Timer Library
+#
+# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+# counter features are provided by the processors time stamp counter.
+#
+# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = DxeCpuTimerLib
+ FILE_GUID = F22CC0DA-E7DB-4E4D-ABE2-A608188233A2
+ MODULE_TYPE = DXE_DRIVER
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = TimerLib|DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION UEFI_DRIVER SMM_CORE
+ CONSTRUCTOR = DxeCpuTimerLibConstructor
+ MODULE_UNI_FILE = DxeCpuTimerLib.uni
+
+[Sources]
+ CpuTimerLib.c
+ DxeCpuTimerLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ PcdLib
+ DebugLib
+ HobLib
+
+[Pcd]
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ## CONSUMES
diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
new file mode 100644
index 0000000000..f55b92abac
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
@@ -0,0 +1,17 @@
+// /** @file
+// DXE CPU Timer Library
+//
+// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+// counter features are provided by the processors time stamp counter.
+//
+// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "CPU Timer Library"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Provides basic timer support using CPUID Leaf 0x15 XTAL frequency."
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
new file mode 100644
index 0000000000..91a7212056
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
@@ -0,0 +1,58 @@
+/** @file
+ CPUID Leaf 0x15 for Core Crystal Clock frequency instance as PEI Timer Library.
+
+ Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiPei.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+#include <Library/HobLib.h>
+#include <Library/DebugLib.h>
+
+extern GUID mCpuCrystalFrequencyHobGuid;
+
+/**
+ CPUID Leaf 0x15 for Core Crystal Clock Frequency.
+
+ The TSC counting frequency is determined by using CPUID leaf 0x15. Frequency in MHz = Core XTAL frequency * EBX/EAX.
+ In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if not supported.
+ @return The number of TSC counts per second.
+
+**/
+UINT64
+CpuidCoreClockCalculateTscFrequency (
+ VOID
+ );
+
+/**
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+InternalGetPerformanceCounterFrequency (
+ VOID
+ )
+{
+ UINT64 *CpuCrystalCounterFrequency;
+ EFI_HOB_GUID_TYPE *GuidHob;
+
+ CpuCrystalCounterFrequency = NULL;
+ GuidHob = GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid);
+ if (GuidHob == NULL) {
+ CpuCrystalCounterFrequency = (UINT64*)BuildGuidHob(&mCpuCrystalFrequencyHobGuid, sizeof (*CpuCrystalCounterFrequency));
+ ASSERT (CpuCrystalCounterFrequency != NULL);
+ *CpuCrystalCounterFrequency = CpuidCoreClockCalculateTscFrequency ();
+ } else {
+ CpuCrystalCounterFrequency = (UINT64*)GET_GUID_HOB_DATA (GuidHob);
+ }
+
+ return *CpuCrystalCounterFrequency;
+}
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
new file mode 100644
index 0000000000..7af0fc44a6
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
@@ -0,0 +1,36 @@
+## @file
+# PEI CPU Timer Library
+#
+# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+# counter features are provided by the processors time stamp counter.
+#
+# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = PeiCpuTimerLib
+ FILE_GUID = 2B13DE00-1A5F-4DD7-A298-01B08AF1015A
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = TimerLib|PEI_CORE PEIM
+ MODULE_UNI_FILE = PeiCpuTimerLib.uni
+
+[Sources]
+ CpuTimerLib.c
+ PeiCpuTimerLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ PcdLib
+ DebugLib
+ HobLib
+
+[Pcd]
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ## CONSUMES
diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
new file mode 100644
index 0000000000..49beb44908
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
@@ -0,0 +1,17 @@
+// /** @file
+// PEI CPU Timer Library
+//
+// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+// counter features are provided by the processors time stamp counter.
+//
+// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "CPU Timer Library"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Provides basic timer support using CPUID Leaf 0x15 XTAL frequency."
+
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index 14ddaa8633..a94bd2ea30 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -211,6 +211,14 @@
# @Prompt If CPU features will be initialized during S3 resume.
gUefiCpuPkgTokenSpaceGuid.PcdCpuFeaturesInitOnS3Resume|FALSE|BOOLEAN|0x0000001D
+ ## Specifies CPUID Leaf 0x15 Time Stamp Counter and Nominal Core Crystal Clock Frequency.
+ # TSC Frequency = ECX (core crystal clock frequency) * EBX/EAX.
+ # Intel Xeon Processor Scalable Family with CPUID signature 06_55H = 25000000 (25MHz)
+ # 6th and 7th generation Intel Core processors and Intel Xeon W Processor Family = 24000000 (24MHz)
+ # Intel Atom processors based on Goldmont Microarchitecture with CPUID signature 06_5CH = 19200000 (19.2MHz)
+ # @Prompt Core Crystal Clock Frequency is for CPUID Leaf 0x15.ECX
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency|24000000|UINT64|0x32132113
+
[PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
## Specifies max supported number of Logical Processors.
# @Prompt Configure max supported number of Logical Processors
diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
index bf690d3978..e7dfe30eda 100644
--- a/UefiCpuPkg/UefiCpuPkg.dsc
+++ b/UefiCpuPkg/UefiCpuPkg.dsc
@@ -101,6 +101,9 @@
UefiCpuPkg/CpuIoPei/CpuIoPei.inf
UefiCpuPkg/Library/SecPeiDxeTimerLibUefiCpu/SecPeiDxeTimerLibUefiCpu.inf
UefiCpuPkg/Application/Cpuid/Cpuid.inf
+ UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
+ UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
+ UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
[Components.IA32, Components.X64]
UefiCpuPkg/CpuDxe/CpuDxe.inf
--
2.14.2.windows.3
^ permalink raw reply related [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-13 10:53 [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf Donald Kuo
@ 2019-08-15 2:45 ` Dong, Eric
2019-08-15 3:02 ` Donald Kuo
0 siblings, 1 reply; 20+ messages in thread
From: Dong, Eric @ 2019-08-15 2:45 UTC (permalink / raw)
To: devel@edk2.groups.io, Kuo, Donald
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V
Reviewed-by: Eric Dong <eric.dong@intel.com>
> -----Original Message-----
> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
> Donald Kuo
> Sent: Tuesday, August 13, 2019 6:53 PM
> To: devel@edk2.groups.io
> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Dong, Eric
> <eric.dong@intel.com>; Chan, Amy <amy.chan@intel.com>; Chaganty,
> Rangasai V <rangasai.v.chaganty@intel.com>
> Subject: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using
> CPUID(0x15) TSC leaf
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1909
>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Star Zeng <star.zeng@intel.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Amy Chan <amy.chan@intel.com>
> Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
> Signed-off-by: Donald Kuo <donald.kuo@intel.com>
> ---
> UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c | 41 +++
> UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf | 35 +++
> UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni | 17 ++
> UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c | 274
> +++++++++++++++++++++
> UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c | 81 ++++++
> UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf | 37 +++
> UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni | 17 ++
> UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c | 58 +++++
> UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf | 36 +++
> UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni | 17 ++
> UefiCpuPkg/UefiCpuPkg.dec | 8 +
> UefiCpuPkg/UefiCpuPkg.dsc | 3 +
> 12 files changed, 624 insertions(+)
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
>
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> new file mode 100644
> index 0000000000..6ddf917bad
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> @@ -0,0 +1,41 @@
> +/** @file
> + CPUID Leaf 0x15 for Core Crystal Clock frequency instance as Base Timer
> Library.
> +
> + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Base.h>
> +#include <Library/TimerLib.h>
> +#include <Library/BaseLib.h>
> +
> +/**
> + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> +
> + The TSC counting frequency is determined by using CPUID leaf 0x15.
> Frequency in MHz = Core XTAL frequency * EBX/EAX.
> + In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if
> not supported.
> + @return The number of TSC counts per second.
> +
> +**/
> +UINT64
> +CpuidCoreClockCalculateTscFrequency (
> + VOID
> + );
> +
> +/**
> + Internal function to retrieves the 64-bit frequency in Hz.
> +
> + Internal function to retrieves the 64-bit frequency in Hz.
> +
> + @return The frequency in Hz.
> +
> +**/
> +UINT64
> +InternalGetPerformanceCounterFrequency (
> + VOID
> + )
> +{
> + return CpuidCoreClockCalculateTscFrequency (); }
> +
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> new file mode 100644
> index 0000000000..fd93adc5f1
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> @@ -0,0 +1,35 @@
> +## @file
> +# Base CPU Timer Library
> +#
> +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> +The performance # counter features are provided by the processors time
> stamp counter.
> +#
> +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> #
> +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> +
> +[Defines]
> + INF_VERSION = 0x00010005
> + BASE_NAME = BaseCpuTimerLib
> + FILE_GUID = F10B5B91-D15A-496C-B044-B5235721AA08
> + MODULE_TYPE = BASE
> + VERSION_STRING = 1.0
> + LIBRARY_CLASS = TimerLib|SEC PEI_CORE PEIM
> + MODULE_UNI_FILE = BaseCpuTimerLib.uni
> +
> +[Sources]
> + CpuTimerLib.c
> + BaseCpuTimerLib.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + UefiCpuPkg/UefiCpuPkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + PcdLib
> + DebugLib
> +
> +[Pcd]
> + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> +CONSUMES
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> new file mode 100644
> index 0000000000..fcf2b0fbcb
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> @@ -0,0 +1,17 @@
> +// /** @file
> +// Base CPU Timer Library
> +//
> +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> +The performance // counter features are provided by the processors time
> stamp counter.
> +//
> +// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> //
> +// SPDX-License-Identifier: BSD-2-Clause-Patent // // **/
> +
> +
> +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> Library"
> +
> +#string STR_MODULE_DESCRIPTION #language en-US "Provides basic
> timer support using CPUID Leaf 0x15 XTAL frequency."
> +
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> new file mode 100644
> index 0000000000..0b9e9384f5
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> @@ -0,0 +1,274 @@
> +/** @file
> + CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer Library.
> +
> + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Base.h>
> +#include <Library/TimerLib.h>
> +#include <Library/BaseLib.h>
> +#include <Library/PcdLib.h>
> +#include <Library/DebugLib.h>
> +#include <Register/Cpuid.h>
> +
> +GUID mCpuCrystalFrequencyHobGuid = { 0xe1ec5ad0, 0x8569, 0x46bd, {
> +0x8d, 0xcd, 0x3b, 0x9f, 0x6f, 0x45, 0x82, 0x7a } };
> +
> +/**
> + Internal function to retrieves the 64-bit frequency in Hz.
> +
> + Internal function to retrieves the 64-bit frequency in Hz.
> +
> + @return The frequency in Hz.
> +
> +**/
> +UINT64
> +InternalGetPerformanceCounterFrequency (
> + VOID
> + );
> +
> +/**
> + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> +
> + The TSC counting frequency is determined by using CPUID leaf 0x15.
> Frequency in MHz = Core XTAL frequency * EBX/EAX.
> + In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if
> not supported.
> + @return The number of TSC counts per second.
> +
> +**/
> +UINT64
> +CpuidCoreClockCalculateTscFrequency (
> + VOID
> + )
> +{
> + UINT64 TscFrequency;
> + UINT64 CoreXtalFrequency;
> + UINT32 RegEax;
> + UINT32 RegEbx;
> + UINT32 RegEcx;
> +
> + //
> + // Use CPUID leaf 0x15 Time Stamp Counter and Nominal Core Crystal
> + Clock Information // EBX returns 0 if not supported. ECX, if non zero,
> provides Core Xtal Frequency in hertz.
> + // TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX.
> + //
> + AsmCpuid (CPUID_TIME_STAMP_COUNTER, &RegEax, &RegEbx, &RegEcx,
> NULL);
> +
> + //
> + // If EBX returns 0, the XTAL ratio is not enumerated.
> + //
> + ASSERT (RegEbx != 0);
> + //
> + // If ECX returns 0, the XTAL frequency is not enumerated.
> + //
> + if (RegEcx == 0) {
> + CoreXtalFrequency = PcdGet64 (PcdCpuCoreCrystalClockFrequency);
> + } else {
> + CoreXtalFrequency = (UINT64) RegEcx; }
> +
> + //
> + // Calculate TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX //
> + TscFrequency = DivU64x32 (MultU64x32 (CoreXtalFrequency, RegEbx) +
> + (UINT64)(RegEax >> 1), RegEax);
> +
> + return TscFrequency;
> +}
> +
> +/**
> + Stalls the CPU for at least the given number of ticks.
> +
> + Stalls the CPU for at least the given number of ticks. It's invoked
> + by
> + MicroSecondDelay() and NanoSecondDelay().
> +
> + @param Delay A period of time to delay in ticks.
> +
> +**/
> +VOID
> +InternalCpuDelay (
> + IN UINT64 Delay
> + )
> +{
> + UINT64 Ticks;
> +
> + //
> + // The target timer count is calculated here // Ticks =
> + AsmReadTsc() + Delay;
> +
> + //
> + // Wait until time out
> + // Timer wrap-arounds are NOT handled correctly by this function.
> + // Thus, this function must be called within 10 years of reset since
> + // Intel guarantees a minimum of 10 years before the TSC wraps.
> + //
> + while (AsmReadTsc() <= Ticks) {
> + CpuPause();
> + }
> +}
> +
> +/**
> + Stalls the CPU for at least the given number of microseconds.
> +
> + Stalls the CPU for the number of microseconds specified by MicroSeconds.
> +
> + @param[in] MicroSeconds The minimum number of microseconds to
> delay.
> +
> + @return MicroSeconds
> +
> +**/
> +UINTN
> +EFIAPI
> +MicroSecondDelay (
> + IN UINTN MicroSeconds
> + )
> +{
> +
> + InternalCpuDelay (
> + DivU64x32 (
> + MultU64x64 (
> + MicroSeconds,
> + InternalGetPerformanceCounterFrequency ()
> + ),
> + 1000000u
> + )
> + );
> +
> + return MicroSeconds;
> +}
> +
> +/**
> + Stalls the CPU for at least the given number of nanoseconds.
> +
> + Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
> +
> + @param NanoSeconds The minimum number of nanoseconds to delay.
> +
> + @return NanoSeconds
> +
> +**/
> +UINTN
> +EFIAPI
> +NanoSecondDelay (
> + IN UINTN NanoSeconds
> + )
> +{
> +
> + InternalCpuDelay (
> + DivU64x32 (
> + MultU64x64 (
> + NanoSeconds,
> + InternalGetPerformanceCounterFrequency ()
> + ),
> + 1000000000u
> + )
> + );
> +
> + return NanoSeconds;
> +}
> +
> +/**
> + Retrieves the current value of a 64-bit free running performance counter.
> +
> + Retrieves the current value of a 64-bit free running performance
> + counter. The counter can either count up by 1 or count down by 1. If
> + the physical performance counter counts by a larger increment, then
> + the counter values must be translated. The properties of the counter
> + can be retrieved from GetPerformanceCounterProperties().
> +
> + @return The current value of the free running performance counter.
> +
> +**/
> +UINT64
> +EFIAPI
> +GetPerformanceCounter (
> + VOID
> + )
> +{
> + return AsmReadTsc ();
> +}
> +
> +/**
> + Retrieves the 64-bit frequency in Hz and the range of performance
> +counter
> + values.
> +
> + If StartValue is not NULL, then the value that the performance
> + counter starts with immediately after is it rolls over is returned in
> + StartValue. If EndValue is not NULL, then the value that the
> + performance counter end with immediately before it rolls over is
> + returned in EndValue. The 64-bit frequency of the performance counter
> + in Hz is always returned. If StartValue is less than EndValue, then
> + the performance counter counts up. If StartValue is greater than
> + EndValue, then the performance counter counts down. For example, a
> + 64-bit free running counter that counts up would have a StartValue of
> + 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
> that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
> +
> + @param StartValue The value the performance counter starts with when
> it
> + rolls over.
> + @param EndValue The value that the performance counter ends with
> before
> + it rolls over.
> +
> + @return The frequency in Hz.
> +
> +**/
> +UINT64
> +EFIAPI
> +GetPerformanceCounterProperties (
> + OUT UINT64 *StartValue, OPTIONAL
> + OUT UINT64 *EndValue OPTIONAL
> + )
> +{
> + if (StartValue != NULL) {
> + *StartValue = 0;
> + }
> +
> + if (EndValue != NULL) {
> + *EndValue = 0xffffffffffffffffULL;
> + }
> + return InternalGetPerformanceCounterFrequency (); }
> +
> +/**
> + Converts elapsed ticks of performance counter to time in nanoseconds.
> +
> + This function converts the elapsed ticks of running performance
> + counter to time value in unit of nanoseconds.
> +
> + @param Ticks The number of elapsed ticks of running performance
> counter.
> +
> + @return The elapsed time in nanoseconds.
> +
> +**/
> +UINT64
> +EFIAPI
> +GetTimeInNanoSecond (
> + IN UINT64 Ticks
> + )
> +{
> + UINT64 Frequency;
> + UINT64 NanoSeconds;
> + UINT64 Remainder;
> + INTN Shift;
> +
> + Frequency = GetPerformanceCounterProperties (NULL, NULL);
> +
> + //
> + // Ticks
> + // Time = --------- x 1,000,000,000
> + // Frequency
> + //
> + NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency,
> + &Remainder), 1000000000u);
> +
> + //
> + // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.
> + // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should <
> + 2^(64-30) = 2^34, // i.e. highest bit set in Remainder should <= 33.
> + //
> + Shift = MAX (0, HighBitSet64 (Remainder) - 33); Remainder =
> + RShiftU64 (Remainder, (UINTN) Shift); Frequency = RShiftU64
> + (Frequency, (UINTN) Shift); NanoSeconds += DivU64x64Remainder
> + (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);
> +
> + return NanoSeconds;
> +}
> +
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> new file mode 100644
> index 0000000000..2d0ef6ab07
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> @@ -0,0 +1,81 @@
> +/** @file
> + CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer Library.
> +
> + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <PiDxe.h>
> +#include <Library/TimerLib.h>
> +#include <Library/BaseLib.h>
> +#include <Library/HobLib.h>
> +
> +extern GUID mCpuCrystalFrequencyHobGuid;
> +
> +/**
> + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> +
> + The TSC counting frequency is determined by using CPUID leaf 0x15.
> Frequency in MHz = Core XTAL frequency * EBX/EAX.
> + In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if
> not supported.
> + @return The number of TSC counts per second.
> +
> +**/
> +UINT64
> +CpuidCoreClockCalculateTscFrequency (
> + VOID
> + );
> +
> +//
> +// Cached CPU Crystal counter frequency //
> +UINT64 mCpuCrystalCounterFrequency = 0;
> +
> +
> +/**
> + Internal function to retrieves the 64-bit frequency in Hz.
> +
> + Internal function to retrieves the 64-bit frequency in Hz.
> +
> + @return The frequency in Hz.
> +
> +**/
> +UINT64
> +InternalGetPerformanceCounterFrequency (
> + VOID
> + )
> +{
> + return mCpuCrystalCounterFrequency;
> +}
> +
> +/**
> + The constructor function is to initialize CpuCrystalCounterFrequency.
> +
> + @param ImageHandle The firmware allocated handle for the EFI image.
> + @param SystemTable A pointer to the EFI System Table.
> +
> + @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +DxeCpuTimerLibConstructor (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + EFI_HOB_GUID_TYPE *GuidHob;
> +
> + //
> + // Initialize CpuCrystalCounterFrequency // GuidHob =
> + GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid); if (GuidHob != NULL)
> + {
> + mCpuCrystalCounterFrequency = *(UINT64*)GET_GUID_HOB_DATA
> + (GuidHob); } else {
> + mCpuCrystalCounterFrequency = CpuidCoreClockCalculateTscFrequency
> + (); }
> +
> + return EFI_SUCCESS;
> +}
> +
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> new file mode 100644
> index 0000000000..6c83549c87
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> @@ -0,0 +1,37 @@
> +## @file
> +# DXE CPU Timer Library
> +#
> +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> +The performance # counter features are provided by the processors time
> stamp counter.
> +#
> +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> #
> +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> +
> +[Defines]
> + INF_VERSION = 0x00010005
> + BASE_NAME = DxeCpuTimerLib
> + FILE_GUID = F22CC0DA-E7DB-4E4D-ABE2-A608188233A2
> + MODULE_TYPE = DXE_DRIVER
> + VERSION_STRING = 1.0
> + LIBRARY_CLASS = TimerLib|DXE_CORE DXE_DRIVER
> DXE_RUNTIME_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION
> UEFI_DRIVER SMM_CORE
> + CONSTRUCTOR = DxeCpuTimerLibConstructor
> + MODULE_UNI_FILE = DxeCpuTimerLib.uni
> +
> +[Sources]
> + CpuTimerLib.c
> + DxeCpuTimerLib.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + UefiCpuPkg/UefiCpuPkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + PcdLib
> + DebugLib
> + HobLib
> +
> +[Pcd]
> + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> +CONSUMES
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> new file mode 100644
> index 0000000000..f55b92abac
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> @@ -0,0 +1,17 @@
> +// /** @file
> +// DXE CPU Timer Library
> +//
> +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> +The performance // counter features are provided by the processors time
> stamp counter.
> +//
> +// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> //
> +// SPDX-License-Identifier: BSD-2-Clause-Patent // // **/
> +
> +
> +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> Library"
> +
> +#string STR_MODULE_DESCRIPTION #language en-US "Provides basic
> timer support using CPUID Leaf 0x15 XTAL frequency."
> +
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> new file mode 100644
> index 0000000000..91a7212056
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> @@ -0,0 +1,58 @@
> +/** @file
> + CPUID Leaf 0x15 for Core Crystal Clock frequency instance as PEI Timer
> Library.
> +
> + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <PiPei.h>
> +#include <Library/TimerLib.h>
> +#include <Library/BaseLib.h>
> +#include <Library/HobLib.h>
> +#include <Library/DebugLib.h>
> +
> +extern GUID mCpuCrystalFrequencyHobGuid;
> +
> +/**
> + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> +
> + The TSC counting frequency is determined by using CPUID leaf 0x15.
> Frequency in MHz = Core XTAL frequency * EBX/EAX.
> + In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if
> not supported.
> + @return The number of TSC counts per second.
> +
> +**/
> +UINT64
> +CpuidCoreClockCalculateTscFrequency (
> + VOID
> + );
> +
> +/**
> + Internal function to retrieves the 64-bit frequency in Hz.
> +
> + Internal function to retrieves the 64-bit frequency in Hz.
> +
> + @return The frequency in Hz.
> +
> +**/
> +UINT64
> +InternalGetPerformanceCounterFrequency (
> + VOID
> + )
> +{
> + UINT64 *CpuCrystalCounterFrequency;
> + EFI_HOB_GUID_TYPE *GuidHob;
> +
> + CpuCrystalCounterFrequency = NULL;
> + GuidHob = GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid); if
> + (GuidHob == NULL) {
> + CpuCrystalCounterFrequency =
> (UINT64*)BuildGuidHob(&mCpuCrystalFrequencyHobGuid, sizeof
> (*CpuCrystalCounterFrequency));
> + ASSERT (CpuCrystalCounterFrequency != NULL);
> + *CpuCrystalCounterFrequency = CpuidCoreClockCalculateTscFrequency
> + (); } else {
> + CpuCrystalCounterFrequency = (UINT64*)GET_GUID_HOB_DATA
> (GuidHob);
> + }
> +
> + return *CpuCrystalCounterFrequency;
> +}
> +
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> new file mode 100644
> index 0000000000..7af0fc44a6
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> @@ -0,0 +1,36 @@
> +## @file
> +# PEI CPU Timer Library
> +#
> +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> +The performance # counter features are provided by the processors time
> stamp counter.
> +#
> +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> #
> +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> +
> +[Defines]
> + INF_VERSION = 0x00010005
> + BASE_NAME = PeiCpuTimerLib
> + FILE_GUID = 2B13DE00-1A5F-4DD7-A298-01B08AF1015A
> + MODULE_TYPE = BASE
> + VERSION_STRING = 1.0
> + LIBRARY_CLASS = TimerLib|PEI_CORE PEIM
> + MODULE_UNI_FILE = PeiCpuTimerLib.uni
> +
> +[Sources]
> + CpuTimerLib.c
> + PeiCpuTimerLib.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + UefiCpuPkg/UefiCpuPkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + PcdLib
> + DebugLib
> + HobLib
> +
> +[Pcd]
> + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> +CONSUMES
> diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> new file mode 100644
> index 0000000000..49beb44908
> --- /dev/null
> +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> @@ -0,0 +1,17 @@
> +// /** @file
> +// PEI CPU Timer Library
> +//
> +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> +The performance // counter features are provided by the processors time
> stamp counter.
> +//
> +// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> //
> +// SPDX-License-Identifier: BSD-2-Clause-Patent // // **/
> +
> +
> +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> Library"
> +
> +#string STR_MODULE_DESCRIPTION #language en-US "Provides basic
> timer support using CPUID Leaf 0x15 XTAL frequency."
> +
> diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
> index 14ddaa8633..a94bd2ea30 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dec
> +++ b/UefiCpuPkg/UefiCpuPkg.dec
> @@ -211,6 +211,14 @@
> # @Prompt If CPU features will be initialized during S3 resume.
>
> gUefiCpuPkgTokenSpaceGuid.PcdCpuFeaturesInitOnS3Resume|FALSE|BOO
> LEAN|0x0000001D
>
> + ## Specifies CPUID Leaf 0x15 Time Stamp Counter and Nominal Core
> Crystal Clock Frequency.
> + # TSC Frequency = ECX (core crystal clock frequency) * EBX/EAX.
> + # Intel Xeon Processor Scalable Family with CPUID signature 06_55H =
> 25000000 (25MHz)
> + # 6th and 7th generation Intel Core processors and Intel Xeon W
> Processor Family = 24000000 (24MHz)
> + # Intel Atom processors based on Goldmont Microarchitecture with
> CPUID signature 06_5CH = 19200000 (19.2MHz)
> + # @Prompt Core Crystal Clock Frequency is for CPUID Leaf 0x15.ECX
> +
> +
> gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency|24000000|
> UIN
> + T64|0x32132113
> +
> [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
> ## Specifies max supported number of Logical Processors.
> # @Prompt Configure max supported number of Logical Processors diff --git
> a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc index
> bf690d3978..e7dfe30eda 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dsc
> +++ b/UefiCpuPkg/UefiCpuPkg.dsc
> @@ -101,6 +101,9 @@
> UefiCpuPkg/CpuIoPei/CpuIoPei.inf
>
> UefiCpuPkg/Library/SecPeiDxeTimerLibUefiCpu/SecPeiDxeTimerLibUefiCpu.i
> nf
> UefiCpuPkg/Application/Cpuid/Cpuid.inf
> + UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> + UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> + UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
>
> [Components.IA32, Components.X64]
> UefiCpuPkg/CpuDxe/CpuDxe.inf
> --
> 2.14.2.windows.3
>
>
>
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-15 2:45 ` [edk2-devel] " Dong, Eric
@ 2019-08-15 3:02 ` Donald Kuo
2019-08-15 4:02 ` Liming Gao
0 siblings, 1 reply; 20+ messages in thread
From: Donald Kuo @ 2019-08-15 3:02 UTC (permalink / raw)
To: Dong, Eric, devel@edk2.groups.io, Gao, Liming
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V, Lai, Luke,
Li, Kevin Y
Hi Liming,
As we plan to add new TimerLib to use CPUID Leaf 0x15 (CPU XTAL clock frequency) to calculate TSC to resolve performance value unreliable concern.
As the code review had got approved and planning into 201908 stable tag. Please help to review whether any concern for 201908 stable tag.
Thanks,
Donald
> -----Original Message-----
> From: Dong, Eric
> Sent: Thursday, August 15, 2019 10:46 AM
> To: devel@edk2.groups.io; Kuo, Donald <donald.kuo@intel.com>
> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan,
> Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaganty@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> using CPUID(0x15) TSC leaf
>
> Reviewed-by: Eric Dong <eric.dong@intel.com>
>
> > -----Original Message-----
> > From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
> > Donald Kuo
> > Sent: Tuesday, August 13, 2019 6:53 PM
> > To: devel@edk2.groups.io
> > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > Dong, Eric <eric.dong@intel.com>; Chan, Amy <amy.chan@intel.com>;
> > Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>
> > Subject: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> > using
> > CPUID(0x15) TSC leaf
> >
> > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> >
> > Cc: Ray Ni <ray.ni@intel.com>
> > Cc: Star Zeng <star.zeng@intel.com>
> > Cc: Eric Dong <eric.dong@intel.com>
> > Cc: Amy Chan <amy.chan@intel.com>
> > Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
> > Signed-off-by: Donald Kuo <donald.kuo@intel.com>
> > ---
> > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c | 41 +++
> > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf | 35 +++
> > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni | 17 ++
> > UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c | 274
> > +++++++++++++++++++++
> > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c | 81 ++++++
> > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf | 37 +++
> > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni | 17 ++
> > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c | 58 +++++
> > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf | 36 +++
> > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni | 17 ++
> > UefiCpuPkg/UefiCpuPkg.dec | 8 +
> > UefiCpuPkg/UefiCpuPkg.dsc | 3 +
> > 12 files changed, 624 insertions(+)
> > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > create mode 100644
> UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > create mode 100644
> UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > create mode 100644
> UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> >
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > new file mode 100644
> > index 0000000000..6ddf917bad
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > @@ -0,0 +1,41 @@
> > +/** @file
> > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance as Base
> > +Timer
> > Library.
> > +
> > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > +**/
> > +
> > +#include <Base.h>
> > +#include <Library/TimerLib.h>
> > +#include <Library/BaseLib.h>
> > +
> > +/**
> > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > +
> > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > + In newer flavors of the CPU, core xtal frequency is returned in ECX
> > + or 0 if
> > not supported.
> > + @return The number of TSC counts per second.
> > +
> > +**/
> > +UINT64
> > +CpuidCoreClockCalculateTscFrequency (
> > + VOID
> > + );
> > +
> > +/**
> > + Internal function to retrieves the 64-bit frequency in Hz.
> > +
> > + Internal function to retrieves the 64-bit frequency in Hz.
> > +
> > + @return The frequency in Hz.
> > +
> > +**/
> > +UINT64
> > +InternalGetPerformanceCounterFrequency (
> > + VOID
> > + )
> > +{
> > + return CpuidCoreClockCalculateTscFrequency (); }
> > +
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > new file mode 100644
> > index 0000000000..fd93adc5f1
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > @@ -0,0 +1,35 @@
> > +## @file
> > +# Base CPU Timer Library
> > +#
> > +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > +The performance # counter features are provided by the processors
> > +time
> > stamp counter.
> > +#
> > +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> #
> > +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > +
> > +[Defines]
> > + INF_VERSION = 0x00010005
> > + BASE_NAME = BaseCpuTimerLib
> > + FILE_GUID = F10B5B91-D15A-496C-B044-B5235721AA08
> > + MODULE_TYPE = BASE
> > + VERSION_STRING = 1.0
> > + LIBRARY_CLASS = TimerLib|SEC PEI_CORE PEIM
> > + MODULE_UNI_FILE = BaseCpuTimerLib.uni
> > +
> > +[Sources]
> > + CpuTimerLib.c
> > + BaseCpuTimerLib.c
> > +
> > +[Packages]
> > + MdePkg/MdePkg.dec
> > + UefiCpuPkg/UefiCpuPkg.dec
> > +
> > +[LibraryClasses]
> > + BaseLib
> > + PcdLib
> > + DebugLib
> > +
> > +[Pcd]
> > + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> > +CONSUMES
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > new file mode 100644
> > index 0000000000..fcf2b0fbcb
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > @@ -0,0 +1,17 @@
> > +// /** @file
> > +// Base CPU Timer Library
> > +//
> > +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > +The performance // counter features are provided by the processors
> > +time
> > stamp counter.
> > +//
> > +// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> //
> > +// SPDX-License-Identifier: BSD-2-Clause-Patent // // **/
> > +
> > +
> > +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> > Library"
> > +
> > +#string STR_MODULE_DESCRIPTION #language en-US "Provides
> basic
> > timer support using CPUID Leaf 0x15 XTAL frequency."
> > +
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > new file mode 100644
> > index 0000000000..0b9e9384f5
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > @@ -0,0 +1,274 @@
> > +/** @file
> > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer
> Library.
> > +
> > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > +**/
> > +
> > +#include <Base.h>
> > +#include <Library/TimerLib.h>
> > +#include <Library/BaseLib.h>
> > +#include <Library/PcdLib.h>
> > +#include <Library/DebugLib.h>
> > +#include <Register/Cpuid.h>
> > +
> > +GUID mCpuCrystalFrequencyHobGuid = { 0xe1ec5ad0, 0x8569, 0x46bd, {
> > +0x8d, 0xcd, 0x3b, 0x9f, 0x6f, 0x45, 0x82, 0x7a } };
> > +
> > +/**
> > + Internal function to retrieves the 64-bit frequency in Hz.
> > +
> > + Internal function to retrieves the 64-bit frequency in Hz.
> > +
> > + @return The frequency in Hz.
> > +
> > +**/
> > +UINT64
> > +InternalGetPerformanceCounterFrequency (
> > + VOID
> > + );
> > +
> > +/**
> > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > +
> > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > + In newer flavors of the CPU, core xtal frequency is returned in ECX
> > + or 0 if
> > not supported.
> > + @return The number of TSC counts per second.
> > +
> > +**/
> > +UINT64
> > +CpuidCoreClockCalculateTscFrequency (
> > + VOID
> > + )
> > +{
> > + UINT64 TscFrequency;
> > + UINT64 CoreXtalFrequency;
> > + UINT32 RegEax;
> > + UINT32 RegEbx;
> > + UINT32 RegEcx;
> > +
> > + //
> > + // Use CPUID leaf 0x15 Time Stamp Counter and Nominal Core Crystal
> > + Clock Information // EBX returns 0 if not supported. ECX, if non
> > + zero,
> > provides Core Xtal Frequency in hertz.
> > + // TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX.
> > + //
> > + AsmCpuid (CPUID_TIME_STAMP_COUNTER, &RegEax, &RegEbx,
> &RegEcx,
> > NULL);
> > +
> > + //
> > + // If EBX returns 0, the XTAL ratio is not enumerated.
> > + //
> > + ASSERT (RegEbx != 0);
> > + //
> > + // If ECX returns 0, the XTAL frequency is not enumerated.
> > + //
> > + if (RegEcx == 0) {
> > + CoreXtalFrequency = PcdGet64 (PcdCpuCoreCrystalClockFrequency);
> > + } else {
> > + CoreXtalFrequency = (UINT64) RegEcx; }
> > +
> > + //
> > + // Calculate TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX
> > + // TscFrequency = DivU64x32 (MultU64x32 (CoreXtalFrequency, RegEbx)
> > + + (UINT64)(RegEax >> 1), RegEax);
> > +
> > + return TscFrequency;
> > +}
> > +
> > +/**
> > + Stalls the CPU for at least the given number of ticks.
> > +
> > + Stalls the CPU for at least the given number of ticks. It's invoked
> > + by
> > + MicroSecondDelay() and NanoSecondDelay().
> > +
> > + @param Delay A period of time to delay in ticks.
> > +
> > +**/
> > +VOID
> > +InternalCpuDelay (
> > + IN UINT64 Delay
> > + )
> > +{
> > + UINT64 Ticks;
> > +
> > + //
> > + // The target timer count is calculated here // Ticks =
> > + AsmReadTsc() + Delay;
> > +
> > + //
> > + // Wait until time out
> > + // Timer wrap-arounds are NOT handled correctly by this function.
> > + // Thus, this function must be called within 10 years of reset
> > +since
> > + // Intel guarantees a minimum of 10 years before the TSC wraps.
> > + //
> > + while (AsmReadTsc() <= Ticks) {
> > + CpuPause();
> > + }
> > +}
> > +
> > +/**
> > + Stalls the CPU for at least the given number of microseconds.
> > +
> > + Stalls the CPU for the number of microseconds specified by
> MicroSeconds.
> > +
> > + @param[in] MicroSeconds The minimum number of microseconds to
> > delay.
> > +
> > + @return MicroSeconds
> > +
> > +**/
> > +UINTN
> > +EFIAPI
> > +MicroSecondDelay (
> > + IN UINTN MicroSeconds
> > + )
> > +{
> > +
> > + InternalCpuDelay (
> > + DivU64x32 (
> > + MultU64x64 (
> > + MicroSeconds,
> > + InternalGetPerformanceCounterFrequency ()
> > + ),
> > + 1000000u
> > + )
> > + );
> > +
> > + return MicroSeconds;
> > +}
> > +
> > +/**
> > + Stalls the CPU for at least the given number of nanoseconds.
> > +
> > + Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
> > +
> > + @param NanoSeconds The minimum number of nanoseconds to delay.
> > +
> > + @return NanoSeconds
> > +
> > +**/
> > +UINTN
> > +EFIAPI
> > +NanoSecondDelay (
> > + IN UINTN NanoSeconds
> > + )
> > +{
> > +
> > + InternalCpuDelay (
> > + DivU64x32 (
> > + MultU64x64 (
> > + NanoSeconds,
> > + InternalGetPerformanceCounterFrequency ()
> > + ),
> > + 1000000000u
> > + )
> > + );
> > +
> > + return NanoSeconds;
> > +}
> > +
> > +/**
> > + Retrieves the current value of a 64-bit free running performance counter.
> > +
> > + Retrieves the current value of a 64-bit free running performance
> > + counter. The counter can either count up by 1 or count down by 1.
> > + If the physical performance counter counts by a larger increment,
> > + then the counter values must be translated. The properties of the
> > + counter can be retrieved from GetPerformanceCounterProperties().
> > +
> > + @return The current value of the free running performance counter.
> > +
> > +**/
> > +UINT64
> > +EFIAPI
> > +GetPerformanceCounter (
> > + VOID
> > + )
> > +{
> > + return AsmReadTsc ();
> > +}
> > +
> > +/**
> > + Retrieves the 64-bit frequency in Hz and the range of performance
> > +counter
> > + values.
> > +
> > + If StartValue is not NULL, then the value that the performance
> > + counter starts with immediately after is it rolls over is returned
> > + in StartValue. If EndValue is not NULL, then the value that the
> > + performance counter end with immediately before it rolls over is
> > + returned in EndValue. The 64-bit frequency of the performance
> > + counter in Hz is always returned. If StartValue is less than
> > + EndValue, then the performance counter counts up. If StartValue is
> > + greater than EndValue, then the performance counter counts down. For
> > + example, a 64-bit free running counter that counts up would have a
> > + StartValue of
> > + 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running
> > + counter
> > that counts down would have a StartValue of 0xFFFFFF and an EndValue of
> 0.
> > +
> > + @param StartValue The value the performance counter starts with
> > + when
> > it
> > + rolls over.
> > + @param EndValue The value that the performance counter ends with
> > before
> > + it rolls over.
> > +
> > + @return The frequency in Hz.
> > +
> > +**/
> > +UINT64
> > +EFIAPI
> > +GetPerformanceCounterProperties (
> > + OUT UINT64 *StartValue, OPTIONAL
> > + OUT UINT64 *EndValue OPTIONAL
> > + )
> > +{
> > + if (StartValue != NULL) {
> > + *StartValue = 0;
> > + }
> > +
> > + if (EndValue != NULL) {
> > + *EndValue = 0xffffffffffffffffULL; } return
> > + InternalGetPerformanceCounterFrequency (); }
> > +
> > +/**
> > + Converts elapsed ticks of performance counter to time in nanoseconds.
> > +
> > + This function converts the elapsed ticks of running performance
> > + counter to time value in unit of nanoseconds.
> > +
> > + @param Ticks The number of elapsed ticks of running performance
> > counter.
> > +
> > + @return The elapsed time in nanoseconds.
> > +
> > +**/
> > +UINT64
> > +EFIAPI
> > +GetTimeInNanoSecond (
> > + IN UINT64 Ticks
> > + )
> > +{
> > + UINT64 Frequency;
> > + UINT64 NanoSeconds;
> > + UINT64 Remainder;
> > + INTN Shift;
> > +
> > + Frequency = GetPerformanceCounterProperties (NULL, NULL);
> > +
> > + //
> > + // Ticks
> > + // Time = --------- x 1,000,000,000
> > + // Frequency
> > + //
> > + NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency,
> > + &Remainder), 1000000000u);
> > +
> > + //
> > + // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.
> > + // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should
> > + <
> > + 2^(64-30) = 2^34, // i.e. highest bit set in Remainder should <= 33.
> > + //
> > + Shift = MAX (0, HighBitSet64 (Remainder) - 33); Remainder =
> > + RShiftU64 (Remainder, (UINTN) Shift); Frequency = RShiftU64
> > + (Frequency, (UINTN) Shift); NanoSeconds += DivU64x64Remainder
> > + (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);
> > +
> > + return NanoSeconds;
> > +}
> > +
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > new file mode 100644
> > index 0000000000..2d0ef6ab07
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > @@ -0,0 +1,81 @@
> > +/** @file
> > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer
> Library.
> > +
> > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > +**/
> > +
> > +#include <PiDxe.h>
> > +#include <Library/TimerLib.h>
> > +#include <Library/BaseLib.h>
> > +#include <Library/HobLib.h>
> > +
> > +extern GUID mCpuCrystalFrequencyHobGuid;
> > +
> > +/**
> > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > +
> > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > + In newer flavors of the CPU, core xtal frequency is returned in ECX
> > + or 0 if
> > not supported.
> > + @return The number of TSC counts per second.
> > +
> > +**/
> > +UINT64
> > +CpuidCoreClockCalculateTscFrequency (
> > + VOID
> > + );
> > +
> > +//
> > +// Cached CPU Crystal counter frequency //
> > +UINT64 mCpuCrystalCounterFrequency = 0;
> > +
> > +
> > +/**
> > + Internal function to retrieves the 64-bit frequency in Hz.
> > +
> > + Internal function to retrieves the 64-bit frequency in Hz.
> > +
> > + @return The frequency in Hz.
> > +
> > +**/
> > +UINT64
> > +InternalGetPerformanceCounterFrequency (
> > + VOID
> > + )
> > +{
> > + return mCpuCrystalCounterFrequency; }
> > +
> > +/**
> > + The constructor function is to initialize CpuCrystalCounterFrequency.
> > +
> > + @param ImageHandle The firmware allocated handle for the EFI image.
> > + @param SystemTable A pointer to the EFI System Table.
> > +
> > + @retval EFI_SUCCESS The constructor always returns
> RETURN_SUCCESS.
> > +
> > +**/
> > +EFI_STATUS
> > +EFIAPI
> > +DxeCpuTimerLibConstructor (
> > + IN EFI_HANDLE ImageHandle,
> > + IN EFI_SYSTEM_TABLE *SystemTable
> > + )
> > +{
> > + EFI_HOB_GUID_TYPE *GuidHob;
> > +
> > + //
> > + // Initialize CpuCrystalCounterFrequency // GuidHob =
> > + GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid); if (GuidHob !=
> > + NULL) {
> > + mCpuCrystalCounterFrequency = *(UINT64*)GET_GUID_HOB_DATA
> > + (GuidHob); } else {
> > + mCpuCrystalCounterFrequency =
> CpuidCoreClockCalculateTscFrequency
> > + (); }
> > +
> > + return EFI_SUCCESS;
> > +}
> > +
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > new file mode 100644
> > index 0000000000..6c83549c87
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > @@ -0,0 +1,37 @@
> > +## @file
> > +# DXE CPU Timer Library
> > +#
> > +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > +The performance # counter features are provided by the processors
> > +time
> > stamp counter.
> > +#
> > +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> #
> > +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > +
> > +[Defines]
> > + INF_VERSION = 0x00010005
> > + BASE_NAME = DxeCpuTimerLib
> > + FILE_GUID = F22CC0DA-E7DB-4E4D-ABE2-A608188233A2
> > + MODULE_TYPE = DXE_DRIVER
> > + VERSION_STRING = 1.0
> > + LIBRARY_CLASS = TimerLib|DXE_CORE DXE_DRIVER
> > DXE_RUNTIME_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION
> UEFI_DRIVER
> > SMM_CORE
> > + CONSTRUCTOR = DxeCpuTimerLibConstructor
> > + MODULE_UNI_FILE = DxeCpuTimerLib.uni
> > +
> > +[Sources]
> > + CpuTimerLib.c
> > + DxeCpuTimerLib.c
> > +
> > +[Packages]
> > + MdePkg/MdePkg.dec
> > + UefiCpuPkg/UefiCpuPkg.dec
> > +
> > +[LibraryClasses]
> > + BaseLib
> > + PcdLib
> > + DebugLib
> > + HobLib
> > +
> > +[Pcd]
> > + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> > +CONSUMES
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > new file mode 100644
> > index 0000000000..f55b92abac
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > @@ -0,0 +1,17 @@
> > +// /** @file
> > +// DXE CPU Timer Library
> > +//
> > +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > +The performance // counter features are provided by the processors
> > +time
> > stamp counter.
> > +//
> > +// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> //
> > +// SPDX-License-Identifier: BSD-2-Clause-Patent // // **/
> > +
> > +
> > +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> > Library"
> > +
> > +#string STR_MODULE_DESCRIPTION #language en-US "Provides
> basic
> > timer support using CPUID Leaf 0x15 XTAL frequency."
> > +
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > new file mode 100644
> > index 0000000000..91a7212056
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > @@ -0,0 +1,58 @@
> > +/** @file
> > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance as PEI
> > +Timer
> > Library.
> > +
> > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > +**/
> > +
> > +#include <PiPei.h>
> > +#include <Library/TimerLib.h>
> > +#include <Library/BaseLib.h>
> > +#include <Library/HobLib.h>
> > +#include <Library/DebugLib.h>
> > +
> > +extern GUID mCpuCrystalFrequencyHobGuid;
> > +
> > +/**
> > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > +
> > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > + In newer flavors of the CPU, core xtal frequency is returned in ECX
> > + or 0 if
> > not supported.
> > + @return The number of TSC counts per second.
> > +
> > +**/
> > +UINT64
> > +CpuidCoreClockCalculateTscFrequency (
> > + VOID
> > + );
> > +
> > +/**
> > + Internal function to retrieves the 64-bit frequency in Hz.
> > +
> > + Internal function to retrieves the 64-bit frequency in Hz.
> > +
> > + @return The frequency in Hz.
> > +
> > +**/
> > +UINT64
> > +InternalGetPerformanceCounterFrequency (
> > + VOID
> > + )
> > +{
> > + UINT64 *CpuCrystalCounterFrequency;
> > + EFI_HOB_GUID_TYPE *GuidHob;
> > +
> > + CpuCrystalCounterFrequency = NULL;
> > + GuidHob = GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid); if
> > + (GuidHob == NULL) {
> > + CpuCrystalCounterFrequency =
> > (UINT64*)BuildGuidHob(&mCpuCrystalFrequencyHobGuid, sizeof
> > (*CpuCrystalCounterFrequency));
> > + ASSERT (CpuCrystalCounterFrequency != NULL);
> > + *CpuCrystalCounterFrequency = CpuidCoreClockCalculateTscFrequency
> > + (); } else {
> > + CpuCrystalCounterFrequency = (UINT64*)GET_GUID_HOB_DATA
> > (GuidHob);
> > + }
> > +
> > + return *CpuCrystalCounterFrequency; }
> > +
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > new file mode 100644
> > index 0000000000..7af0fc44a6
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > @@ -0,0 +1,36 @@
> > +## @file
> > +# PEI CPU Timer Library
> > +#
> > +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > +The performance # counter features are provided by the processors
> > +time
> > stamp counter.
> > +#
> > +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> #
> > +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > +
> > +[Defines]
> > + INF_VERSION = 0x00010005
> > + BASE_NAME = PeiCpuTimerLib
> > + FILE_GUID = 2B13DE00-1A5F-4DD7-A298-01B08AF1015A
> > + MODULE_TYPE = BASE
> > + VERSION_STRING = 1.0
> > + LIBRARY_CLASS = TimerLib|PEI_CORE PEIM
> > + MODULE_UNI_FILE = PeiCpuTimerLib.uni
> > +
> > +[Sources]
> > + CpuTimerLib.c
> > + PeiCpuTimerLib.c
> > +
> > +[Packages]
> > + MdePkg/MdePkg.dec
> > + UefiCpuPkg/UefiCpuPkg.dec
> > +
> > +[LibraryClasses]
> > + BaseLib
> > + PcdLib
> > + DebugLib
> > + HobLib
> > +
> > +[Pcd]
> > + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> > +CONSUMES
> > diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > new file mode 100644
> > index 0000000000..49beb44908
> > --- /dev/null
> > +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > @@ -0,0 +1,17 @@
> > +// /** @file
> > +// PEI CPU Timer Library
> > +//
> > +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > +The performance // counter features are provided by the processors
> > +time
> > stamp counter.
> > +//
> > +// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> //
> > +// SPDX-License-Identifier: BSD-2-Clause-Patent // // **/
> > +
> > +
> > +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> > Library"
> > +
> > +#string STR_MODULE_DESCRIPTION #language en-US "Provides
> basic
> > timer support using CPUID Leaf 0x15 XTAL frequency."
> > +
> > diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
> > index 14ddaa8633..a94bd2ea30 100644
> > --- a/UefiCpuPkg/UefiCpuPkg.dec
> > +++ b/UefiCpuPkg/UefiCpuPkg.dec
> > @@ -211,6 +211,14 @@
> > # @Prompt If CPU features will be initialized during S3 resume.
> >
> > gUefiCpuPkgTokenSpaceGuid.PcdCpuFeaturesInitOnS3Resume|FALSE|BOO
> > LEAN|0x0000001D
> >
> > + ## Specifies CPUID Leaf 0x15 Time Stamp Counter and Nominal Core
> > Crystal Clock Frequency.
> > + # TSC Frequency = ECX (core crystal clock frequency) * EBX/EAX.
> > + # Intel Xeon Processor Scalable Family with CPUID signature 06_55H =
> > 25000000 (25MHz)
> > + # 6th and 7th generation Intel Core processors and Intel Xeon W
> > Processor Family = 24000000 (24MHz)
> > + # Intel Atom processors based on Goldmont Microarchitecture with
> > CPUID signature 06_5CH = 19200000 (19.2MHz)
> > + # @Prompt Core Crystal Clock Frequency is for CPUID Leaf 0x15.ECX
> > +
> > +
> >
> gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency|24000000|
> > UIN
> > + T64|0x32132113
> > +
> > [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
> > ## Specifies max supported number of Logical Processors.
> > # @Prompt Configure max supported number of Logical Processors diff
> > --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc index
> > bf690d3978..e7dfe30eda 100644
> > --- a/UefiCpuPkg/UefiCpuPkg.dsc
> > +++ b/UefiCpuPkg/UefiCpuPkg.dsc
> > @@ -101,6 +101,9 @@
> > UefiCpuPkg/CpuIoPei/CpuIoPei.inf
> >
> >
> UefiCpuPkg/Library/SecPeiDxeTimerLibUefiCpu/SecPeiDxeTimerLibUefiCpu.i
> > nf
> > UefiCpuPkg/Application/Cpuid/Cpuid.inf
> > + UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > + UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > + UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> >
> > [Components.IA32, Components.X64]
> > UefiCpuPkg/CpuDxe/CpuDxe.inf
> > --
> > 2.14.2.windows.3
> >
> >
> >
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-15 3:02 ` Donald Kuo
@ 2019-08-15 4:02 ` Liming Gao
2019-08-15 4:40 ` Donald Kuo
2019-08-16 16:16 ` Laszlo Ersek
0 siblings, 2 replies; 20+ messages in thread
From: Liming Gao @ 2019-08-15 4:02 UTC (permalink / raw)
To: Kuo, Donald, Dong, Eric, devel@edk2.groups.io
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V, Lai, Luke,
Li, Kevin Y, Laszlo Ersek (lersek@redhat.com),
leif.lindholm@linaro.org, afish@apple.com, Kinney, Michael D
Donald:
This change is a new feature. Now, it is not in edk2 feature planning list. If you want to catch it into 201908 stable tag, please get approve from Stewards first. I have cc this mail to all Stewards.
For this patch, I have one minor comment. You add one PCD in UefiCpuPkg DEC. Please also add this PCD into UefiCpuPkg.uni.
Thanks
Liming
> -----Original Message-----
> From: Kuo, Donald
> Sent: Thursday, August 15, 2019 11:02 AM
> To: Dong, Eric <eric.dong@intel.com>; devel@edk2.groups.io; Gao, Liming <liming.gao@intel.com>
> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin Y <kevin.y.li@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
>
> Hi Liming,
>
> As we plan to add new TimerLib to use CPUID Leaf 0x15 (CPU XTAL clock frequency) to calculate TSC to resolve performance value
> unreliable concern.
>
> As the code review had got approved and planning into 201908 stable tag. Please help to review whether any concern for 201908 stable
> tag.
>
> Thanks,
> Donald
>
> > -----Original Message-----
> > From: Dong, Eric
> > Sent: Thursday, August 15, 2019 10:46 AM
> > To: devel@edk2.groups.io; Kuo, Donald <donald.kuo@intel.com>
> > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan,
> > Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > <rangasai.v.chaganty@intel.com>
> > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> > using CPUID(0x15) TSC leaf
> >
> > Reviewed-by: Eric Dong <eric.dong@intel.com>
> >
> > > -----Original Message-----
> > > From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
> > > Donald Kuo
> > > Sent: Tuesday, August 13, 2019 6:53 PM
> > > To: devel@edk2.groups.io
> > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > Dong, Eric <eric.dong@intel.com>; Chan, Amy <amy.chan@intel.com>;
> > > Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>
> > > Subject: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> > > using
> > > CPUID(0x15) TSC leaf
> > >
> > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> > >
> > > Cc: Ray Ni <ray.ni@intel.com>
> > > Cc: Star Zeng <star.zeng@intel.com>
> > > Cc: Eric Dong <eric.dong@intel.com>
> > > Cc: Amy Chan <amy.chan@intel.com>
> > > Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
> > > Signed-off-by: Donald Kuo <donald.kuo@intel.com>
> > > ---
> > > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c | 41 +++
> > > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf | 35 +++
> > > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni | 17 ++
> > > UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c | 274
> > > +++++++++++++++++++++
> > > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c | 81 ++++++
> > > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf | 37 +++
> > > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni | 17 ++
> > > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c | 58 +++++
> > > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf | 36 +++
> > > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni | 17 ++
> > > UefiCpuPkg/UefiCpuPkg.dec | 8 +
> > > UefiCpuPkg/UefiCpuPkg.dsc | 3 +
> > > 12 files changed, 624 insertions(+)
> > > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > > create mode 100644
> > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > create mode 100644
> > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > create mode 100644
> > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > >
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > > b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > > new file mode 100644
> > > index 0000000000..6ddf917bad
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > > @@ -0,0 +1,41 @@
> > > +/** @file
> > > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance as Base
> > > +Timer
> > > Library.
> > > +
> > > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > +
> > > +**/
> > > +
> > > +#include <Base.h>
> > > +#include <Library/TimerLib.h>
> > > +#include <Library/BaseLib.h>
> > > +
> > > +/**
> > > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > > +
> > > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > > + In newer flavors of the CPU, core xtal frequency is returned in ECX
> > > + or 0 if
> > > not supported.
> > > + @return The number of TSC counts per second.
> > > +
> > > +**/
> > > +UINT64
> > > +CpuidCoreClockCalculateTscFrequency (
> > > + VOID
> > > + );
> > > +
> > > +/**
> > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > +
> > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > +
> > > + @return The frequency in Hz.
> > > +
> > > +**/
> > > +UINT64
> > > +InternalGetPerformanceCounterFrequency (
> > > + VOID
> > > + )
> > > +{
> > > + return CpuidCoreClockCalculateTscFrequency (); }
> > > +
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > new file mode 100644
> > > index 0000000000..fd93adc5f1
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > @@ -0,0 +1,35 @@
> > > +## @file
> > > +# Base CPU Timer Library
> > > +#
> > > +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > +The performance # counter features are provided by the processors
> > > +time
> > > stamp counter.
> > > +#
> > > +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> #
> > > +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > > +
> > > +[Defines]
> > > + INF_VERSION = 0x00010005
> > > + BASE_NAME = BaseCpuTimerLib
> > > + FILE_GUID = F10B5B91-D15A-496C-B044-B5235721AA08
> > > + MODULE_TYPE = BASE
> > > + VERSION_STRING = 1.0
> > > + LIBRARY_CLASS = TimerLib|SEC PEI_CORE PEIM
> > > + MODULE_UNI_FILE = BaseCpuTimerLib.uni
> > > +
> > > +[Sources]
> > > + CpuTimerLib.c
> > > + BaseCpuTimerLib.c
> > > +
> > > +[Packages]
> > > + MdePkg/MdePkg.dec
> > > + UefiCpuPkg/UefiCpuPkg.dec
> > > +
> > > +[LibraryClasses]
> > > + BaseLib
> > > + PcdLib
> > > + DebugLib
> > > +
> > > +[Pcd]
> > > + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> > > +CONSUMES
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > > b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > > new file mode 100644
> > > index 0000000000..fcf2b0fbcb
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > > @@ -0,0 +1,17 @@
> > > +// /** @file
> > > +// Base CPU Timer Library
> > > +//
> > > +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > +The performance // counter features are provided by the processors
> > > +time
> > > stamp counter.
> > > +//
> > > +// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> //
> > > +// SPDX-License-Identifier: BSD-2-Clause-Patent // // **/
> > > +
> > > +
> > > +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> > > Library"
> > > +
> > > +#string STR_MODULE_DESCRIPTION #language en-US "Provides
> > basic
> > > timer support using CPUID Leaf 0x15 XTAL frequency."
> > > +
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > > b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > > new file mode 100644
> > > index 0000000000..0b9e9384f5
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > > @@ -0,0 +1,274 @@
> > > +/** @file
> > > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer
> > Library.
> > > +
> > > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > +
> > > +**/
> > > +
> > > +#include <Base.h>
> > > +#include <Library/TimerLib.h>
> > > +#include <Library/BaseLib.h>
> > > +#include <Library/PcdLib.h>
> > > +#include <Library/DebugLib.h>
> > > +#include <Register/Cpuid.h>
> > > +
> > > +GUID mCpuCrystalFrequencyHobGuid = { 0xe1ec5ad0, 0x8569, 0x46bd, {
> > > +0x8d, 0xcd, 0x3b, 0x9f, 0x6f, 0x45, 0x82, 0x7a } };
> > > +
> > > +/**
> > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > +
> > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > +
> > > + @return The frequency in Hz.
> > > +
> > > +**/
> > > +UINT64
> > > +InternalGetPerformanceCounterFrequency (
> > > + VOID
> > > + );
> > > +
> > > +/**
> > > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > > +
> > > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > > + In newer flavors of the CPU, core xtal frequency is returned in ECX
> > > + or 0 if
> > > not supported.
> > > + @return The number of TSC counts per second.
> > > +
> > > +**/
> > > +UINT64
> > > +CpuidCoreClockCalculateTscFrequency (
> > > + VOID
> > > + )
> > > +{
> > > + UINT64 TscFrequency;
> > > + UINT64 CoreXtalFrequency;
> > > + UINT32 RegEax;
> > > + UINT32 RegEbx;
> > > + UINT32 RegEcx;
> > > +
> > > + //
> > > + // Use CPUID leaf 0x15 Time Stamp Counter and Nominal Core Crystal
> > > + Clock Information // EBX returns 0 if not supported. ECX, if non
> > > + zero,
> > > provides Core Xtal Frequency in hertz.
> > > + // TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX.
> > > + //
> > > + AsmCpuid (CPUID_TIME_STAMP_COUNTER, &RegEax, &RegEbx,
> > &RegEcx,
> > > NULL);
> > > +
> > > + //
> > > + // If EBX returns 0, the XTAL ratio is not enumerated.
> > > + //
> > > + ASSERT (RegEbx != 0);
> > > + //
> > > + // If ECX returns 0, the XTAL frequency is not enumerated.
> > > + //
> > > + if (RegEcx == 0) {
> > > + CoreXtalFrequency = PcdGet64 (PcdCpuCoreCrystalClockFrequency);
> > > + } else {
> > > + CoreXtalFrequency = (UINT64) RegEcx; }
> > > +
> > > + //
> > > + // Calculate TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX
> > > + // TscFrequency = DivU64x32 (MultU64x32 (CoreXtalFrequency, RegEbx)
> > > + + (UINT64)(RegEax >> 1), RegEax);
> > > +
> > > + return TscFrequency;
> > > +}
> > > +
> > > +/**
> > > + Stalls the CPU for at least the given number of ticks.
> > > +
> > > + Stalls the CPU for at least the given number of ticks. It's invoked
> > > + by
> > > + MicroSecondDelay() and NanoSecondDelay().
> > > +
> > > + @param Delay A period of time to delay in ticks.
> > > +
> > > +**/
> > > +VOID
> > > +InternalCpuDelay (
> > > + IN UINT64 Delay
> > > + )
> > > +{
> > > + UINT64 Ticks;
> > > +
> > > + //
> > > + // The target timer count is calculated here // Ticks =
> > > + AsmReadTsc() + Delay;
> > > +
> > > + //
> > > + // Wait until time out
> > > + // Timer wrap-arounds are NOT handled correctly by this function.
> > > + // Thus, this function must be called within 10 years of reset
> > > +since
> > > + // Intel guarantees a minimum of 10 years before the TSC wraps.
> > > + //
> > > + while (AsmReadTsc() <= Ticks) {
> > > + CpuPause();
> > > + }
> > > +}
> > > +
> > > +/**
> > > + Stalls the CPU for at least the given number of microseconds.
> > > +
> > > + Stalls the CPU for the number of microseconds specified by
> > MicroSeconds.
> > > +
> > > + @param[in] MicroSeconds The minimum number of microseconds to
> > > delay.
> > > +
> > > + @return MicroSeconds
> > > +
> > > +**/
> > > +UINTN
> > > +EFIAPI
> > > +MicroSecondDelay (
> > > + IN UINTN MicroSeconds
> > > + )
> > > +{
> > > +
> > > + InternalCpuDelay (
> > > + DivU64x32 (
> > > + MultU64x64 (
> > > + MicroSeconds,
> > > + InternalGetPerformanceCounterFrequency ()
> > > + ),
> > > + 1000000u
> > > + )
> > > + );
> > > +
> > > + return MicroSeconds;
> > > +}
> > > +
> > > +/**
> > > + Stalls the CPU for at least the given number of nanoseconds.
> > > +
> > > + Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
> > > +
> > > + @param NanoSeconds The minimum number of nanoseconds to delay.
> > > +
> > > + @return NanoSeconds
> > > +
> > > +**/
> > > +UINTN
> > > +EFIAPI
> > > +NanoSecondDelay (
> > > + IN UINTN NanoSeconds
> > > + )
> > > +{
> > > +
> > > + InternalCpuDelay (
> > > + DivU64x32 (
> > > + MultU64x64 (
> > > + NanoSeconds,
> > > + InternalGetPerformanceCounterFrequency ()
> > > + ),
> > > + 1000000000u
> > > + )
> > > + );
> > > +
> > > + return NanoSeconds;
> > > +}
> > > +
> > > +/**
> > > + Retrieves the current value of a 64-bit free running performance counter.
> > > +
> > > + Retrieves the current value of a 64-bit free running performance
> > > + counter. The counter can either count up by 1 or count down by 1.
> > > + If the physical performance counter counts by a larger increment,
> > > + then the counter values must be translated. The properties of the
> > > + counter can be retrieved from GetPerformanceCounterProperties().
> > > +
> > > + @return The current value of the free running performance counter.
> > > +
> > > +**/
> > > +UINT64
> > > +EFIAPI
> > > +GetPerformanceCounter (
> > > + VOID
> > > + )
> > > +{
> > > + return AsmReadTsc ();
> > > +}
> > > +
> > > +/**
> > > + Retrieves the 64-bit frequency in Hz and the range of performance
> > > +counter
> > > + values.
> > > +
> > > + If StartValue is not NULL, then the value that the performance
> > > + counter starts with immediately after is it rolls over is returned
> > > + in StartValue. If EndValue is not NULL, then the value that the
> > > + performance counter end with immediately before it rolls over is
> > > + returned in EndValue. The 64-bit frequency of the performance
> > > + counter in Hz is always returned. If StartValue is less than
> > > + EndValue, then the performance counter counts up. If StartValue is
> > > + greater than EndValue, then the performance counter counts down. For
> > > + example, a 64-bit free running counter that counts up would have a
> > > + StartValue of
> > > + 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running
> > > + counter
> > > that counts down would have a StartValue of 0xFFFFFF and an EndValue of
> > 0.
> > > +
> > > + @param StartValue The value the performance counter starts with
> > > + when
> > > it
> > > + rolls over.
> > > + @param EndValue The value that the performance counter ends with
> > > before
> > > + it rolls over.
> > > +
> > > + @return The frequency in Hz.
> > > +
> > > +**/
> > > +UINT64
> > > +EFIAPI
> > > +GetPerformanceCounterProperties (
> > > + OUT UINT64 *StartValue, OPTIONAL
> > > + OUT UINT64 *EndValue OPTIONAL
> > > + )
> > > +{
> > > + if (StartValue != NULL) {
> > > + *StartValue = 0;
> > > + }
> > > +
> > > + if (EndValue != NULL) {
> > > + *EndValue = 0xffffffffffffffffULL; } return
> > > + InternalGetPerformanceCounterFrequency (); }
> > > +
> > > +/**
> > > + Converts elapsed ticks of performance counter to time in nanoseconds.
> > > +
> > > + This function converts the elapsed ticks of running performance
> > > + counter to time value in unit of nanoseconds.
> > > +
> > > + @param Ticks The number of elapsed ticks of running performance
> > > counter.
> > > +
> > > + @return The elapsed time in nanoseconds.
> > > +
> > > +**/
> > > +UINT64
> > > +EFIAPI
> > > +GetTimeInNanoSecond (
> > > + IN UINT64 Ticks
> > > + )
> > > +{
> > > + UINT64 Frequency;
> > > + UINT64 NanoSeconds;
> > > + UINT64 Remainder;
> > > + INTN Shift;
> > > +
> > > + Frequency = GetPerformanceCounterProperties (NULL, NULL);
> > > +
> > > + //
> > > + // Ticks
> > > + // Time = --------- x 1,000,000,000
> > > + // Frequency
> > > + //
> > > + NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency,
> > > + &Remainder), 1000000000u);
> > > +
> > > + //
> > > + // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.
> > > + // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should
> > > + <
> > > + 2^(64-30) = 2^34, // i.e. highest bit set in Remainder should <= 33.
> > > + //
> > > + Shift = MAX (0, HighBitSet64 (Remainder) - 33); Remainder =
> > > + RShiftU64 (Remainder, (UINTN) Shift); Frequency = RShiftU64
> > > + (Frequency, (UINTN) Shift); NanoSeconds += DivU64x64Remainder
> > > + (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);
> > > +
> > > + return NanoSeconds;
> > > +}
> > > +
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > > b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > > new file mode 100644
> > > index 0000000000..2d0ef6ab07
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > > @@ -0,0 +1,81 @@
> > > +/** @file
> > > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer
> > Library.
> > > +
> > > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > +
> > > +**/
> > > +
> > > +#include <PiDxe.h>
> > > +#include <Library/TimerLib.h>
> > > +#include <Library/BaseLib.h>
> > > +#include <Library/HobLib.h>
> > > +
> > > +extern GUID mCpuCrystalFrequencyHobGuid;
> > > +
> > > +/**
> > > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > > +
> > > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > > + In newer flavors of the CPU, core xtal frequency is returned in ECX
> > > + or 0 if
> > > not supported.
> > > + @return The number of TSC counts per second.
> > > +
> > > +**/
> > > +UINT64
> > > +CpuidCoreClockCalculateTscFrequency (
> > > + VOID
> > > + );
> > > +
> > > +//
> > > +// Cached CPU Crystal counter frequency //
> > > +UINT64 mCpuCrystalCounterFrequency = 0;
> > > +
> > > +
> > > +/**
> > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > +
> > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > +
> > > + @return The frequency in Hz.
> > > +
> > > +**/
> > > +UINT64
> > > +InternalGetPerformanceCounterFrequency (
> > > + VOID
> > > + )
> > > +{
> > > + return mCpuCrystalCounterFrequency; }
> > > +
> > > +/**
> > > + The constructor function is to initialize CpuCrystalCounterFrequency.
> > > +
> > > + @param ImageHandle The firmware allocated handle for the EFI image.
> > > + @param SystemTable A pointer to the EFI System Table.
> > > +
> > > + @retval EFI_SUCCESS The constructor always returns
> > RETURN_SUCCESS.
> > > +
> > > +**/
> > > +EFI_STATUS
> > > +EFIAPI
> > > +DxeCpuTimerLibConstructor (
> > > + IN EFI_HANDLE ImageHandle,
> > > + IN EFI_SYSTEM_TABLE *SystemTable
> > > + )
> > > +{
> > > + EFI_HOB_GUID_TYPE *GuidHob;
> > > +
> > > + //
> > > + // Initialize CpuCrystalCounterFrequency // GuidHob =
> > > + GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid); if (GuidHob !=
> > > + NULL) {
> > > + mCpuCrystalCounterFrequency = *(UINT64*)GET_GUID_HOB_DATA
> > > + (GuidHob); } else {
> > > + mCpuCrystalCounterFrequency =
> > CpuidCoreClockCalculateTscFrequency
> > > + (); }
> > > +
> > > + return EFI_SUCCESS;
> > > +}
> > > +
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > new file mode 100644
> > > index 0000000000..6c83549c87
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > @@ -0,0 +1,37 @@
> > > +## @file
> > > +# DXE CPU Timer Library
> > > +#
> > > +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > +The performance # counter features are provided by the processors
> > > +time
> > > stamp counter.
> > > +#
> > > +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> #
> > > +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > > +
> > > +[Defines]
> > > + INF_VERSION = 0x00010005
> > > + BASE_NAME = DxeCpuTimerLib
> > > + FILE_GUID = F22CC0DA-E7DB-4E4D-ABE2-A608188233A2
> > > + MODULE_TYPE = DXE_DRIVER
> > > + VERSION_STRING = 1.0
> > > + LIBRARY_CLASS = TimerLib|DXE_CORE DXE_DRIVER
> > > DXE_RUNTIME_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION
> > UEFI_DRIVER
> > > SMM_CORE
> > > + CONSTRUCTOR = DxeCpuTimerLibConstructor
> > > + MODULE_UNI_FILE = DxeCpuTimerLib.uni
> > > +
> > > +[Sources]
> > > + CpuTimerLib.c
> > > + DxeCpuTimerLib.c
> > > +
> > > +[Packages]
> > > + MdePkg/MdePkg.dec
> > > + UefiCpuPkg/UefiCpuPkg.dec
> > > +
> > > +[LibraryClasses]
> > > + BaseLib
> > > + PcdLib
> > > + DebugLib
> > > + HobLib
> > > +
> > > +[Pcd]
> > > + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> > > +CONSUMES
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > > b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > > new file mode 100644
> > > index 0000000000..f55b92abac
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > > @@ -0,0 +1,17 @@
> > > +// /** @file
> > > +// DXE CPU Timer Library
> > > +//
> > > +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > +The performance // counter features are provided by the processors
> > > +time
> > > stamp counter.
> > > +//
> > > +// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> //
> > > +// SPDX-License-Identifier: BSD-2-Clause-Patent // // **/
> > > +
> > > +
> > > +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> > > Library"
> > > +
> > > +#string STR_MODULE_DESCRIPTION #language en-US "Provides
> > basic
> > > timer support using CPUID Leaf 0x15 XTAL frequency."
> > > +
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > > b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > > new file mode 100644
> > > index 0000000000..91a7212056
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > > @@ -0,0 +1,58 @@
> > > +/** @file
> > > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance as PEI
> > > +Timer
> > > Library.
> > > +
> > > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > +
> > > +**/
> > > +
> > > +#include <PiPei.h>
> > > +#include <Library/TimerLib.h>
> > > +#include <Library/BaseLib.h>
> > > +#include <Library/HobLib.h>
> > > +#include <Library/DebugLib.h>
> > > +
> > > +extern GUID mCpuCrystalFrequencyHobGuid;
> > > +
> > > +/**
> > > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > > +
> > > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > > + In newer flavors of the CPU, core xtal frequency is returned in ECX
> > > + or 0 if
> > > not supported.
> > > + @return The number of TSC counts per second.
> > > +
> > > +**/
> > > +UINT64
> > > +CpuidCoreClockCalculateTscFrequency (
> > > + VOID
> > > + );
> > > +
> > > +/**
> > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > +
> > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > +
> > > + @return The frequency in Hz.
> > > +
> > > +**/
> > > +UINT64
> > > +InternalGetPerformanceCounterFrequency (
> > > + VOID
> > > + )
> > > +{
> > > + UINT64 *CpuCrystalCounterFrequency;
> > > + EFI_HOB_GUID_TYPE *GuidHob;
> > > +
> > > + CpuCrystalCounterFrequency = NULL;
> > > + GuidHob = GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid); if
> > > + (GuidHob == NULL) {
> > > + CpuCrystalCounterFrequency =
> > > (UINT64*)BuildGuidHob(&mCpuCrystalFrequencyHobGuid, sizeof
> > > (*CpuCrystalCounterFrequency));
> > > + ASSERT (CpuCrystalCounterFrequency != NULL);
> > > + *CpuCrystalCounterFrequency = CpuidCoreClockCalculateTscFrequency
> > > + (); } else {
> > > + CpuCrystalCounterFrequency = (UINT64*)GET_GUID_HOB_DATA
> > > (GuidHob);
> > > + }
> > > +
> > > + return *CpuCrystalCounterFrequency; }
> > > +
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > > b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > > new file mode 100644
> > > index 0000000000..7af0fc44a6
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > > @@ -0,0 +1,36 @@
> > > +## @file
> > > +# PEI CPU Timer Library
> > > +#
> > > +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > +The performance # counter features are provided by the processors
> > > +time
> > > stamp counter.
> > > +#
> > > +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> #
> > > +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > > +
> > > +[Defines]
> > > + INF_VERSION = 0x00010005
> > > + BASE_NAME = PeiCpuTimerLib
> > > + FILE_GUID = 2B13DE00-1A5F-4DD7-A298-01B08AF1015A
> > > + MODULE_TYPE = BASE
> > > + VERSION_STRING = 1.0
> > > + LIBRARY_CLASS = TimerLib|PEI_CORE PEIM
> > > + MODULE_UNI_FILE = PeiCpuTimerLib.uni
> > > +
> > > +[Sources]
> > > + CpuTimerLib.c
> > > + PeiCpuTimerLib.c
> > > +
> > > +[Packages]
> > > + MdePkg/MdePkg.dec
> > > + UefiCpuPkg/UefiCpuPkg.dec
> > > +
> > > +[LibraryClasses]
> > > + BaseLib
> > > + PcdLib
> > > + DebugLib
> > > + HobLib
> > > +
> > > +[Pcd]
> > > + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> > > +CONSUMES
> > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > > b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > > new file mode 100644
> > > index 0000000000..49beb44908
> > > --- /dev/null
> > > +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > > @@ -0,0 +1,17 @@
> > > +// /** @file
> > > +// PEI CPU Timer Library
> > > +//
> > > +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > +The performance // counter features are provided by the processors
> > > +time
> > > stamp counter.
> > > +//
> > > +// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR> //
> > > +// SPDX-License-Identifier: BSD-2-Clause-Patent // // **/
> > > +
> > > +
> > > +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> > > Library"
> > > +
> > > +#string STR_MODULE_DESCRIPTION #language en-US "Provides
> > basic
> > > timer support using CPUID Leaf 0x15 XTAL frequency."
> > > +
> > > diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
> > > index 14ddaa8633..a94bd2ea30 100644
> > > --- a/UefiCpuPkg/UefiCpuPkg.dec
> > > +++ b/UefiCpuPkg/UefiCpuPkg.dec
> > > @@ -211,6 +211,14 @@
> > > # @Prompt If CPU features will be initialized during S3 resume.
> > >
> > > gUefiCpuPkgTokenSpaceGuid.PcdCpuFeaturesInitOnS3Resume|FALSE|BOO
> > > LEAN|0x0000001D
> > >
> > > + ## Specifies CPUID Leaf 0x15 Time Stamp Counter and Nominal Core
> > > Crystal Clock Frequency.
> > > + # TSC Frequency = ECX (core crystal clock frequency) * EBX/EAX.
> > > + # Intel Xeon Processor Scalable Family with CPUID signature 06_55H =
> > > 25000000 (25MHz)
> > > + # 6th and 7th generation Intel Core processors and Intel Xeon W
> > > Processor Family = 24000000 (24MHz)
> > > + # Intel Atom processors based on Goldmont Microarchitecture with
> > > CPUID signature 06_5CH = 19200000 (19.2MHz)
> > > + # @Prompt Core Crystal Clock Frequency is for CPUID Leaf 0x15.ECX
> > > +
> > > +
> > >
> > gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency|24000000|
> > > UIN
> > > + T64|0x32132113
> > > +
> > > [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
> > > ## Specifies max supported number of Logical Processors.
> > > # @Prompt Configure max supported number of Logical Processors diff
> > > --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc index
> > > bf690d3978..e7dfe30eda 100644
> > > --- a/UefiCpuPkg/UefiCpuPkg.dsc
> > > +++ b/UefiCpuPkg/UefiCpuPkg.dsc
> > > @@ -101,6 +101,9 @@
> > > UefiCpuPkg/CpuIoPei/CpuIoPei.inf
> > >
> > >
> > UefiCpuPkg/Library/SecPeiDxeTimerLibUefiCpu/SecPeiDxeTimerLibUefiCpu.i
> > > nf
> > > UefiCpuPkg/Application/Cpuid/Cpuid.inf
> > > + UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > + UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > + UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > >
> > > [Components.IA32, Components.X64]
> > > UefiCpuPkg/CpuDxe/CpuDxe.inf
> > > --
> > > 2.14.2.windows.3
> > >
> > >
> > >
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-15 4:02 ` Liming Gao
@ 2019-08-15 4:40 ` Donald Kuo
2019-08-16 16:16 ` Laszlo Ersek
1 sibling, 0 replies; 20+ messages in thread
From: Donald Kuo @ 2019-08-15 4:40 UTC (permalink / raw)
To: Gao, Liming, Dong, Eric, devel@edk2.groups.io
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V, Lai, Luke,
Li, Kevin Y, Laszlo Ersek (lersek@redhat.com),
leif.lindholm@linaro.org, afish@apple.com, Kinney, Michael D
[-- Attachment #1: Type: text/plain, Size: 33310 bytes --]
Thanks Liming for review.
Update UefiCpuPkg.uni for review again.
Thanks,
Donald
> -----Original Message-----
> From: Gao, Liming
> Sent: Thursday, August 15, 2019 12:03 PM
> To: Kuo, Donald <donald.kuo@intel.com>; Dong, Eric
> <eric.dong@intel.com>; devel@edk2.groups.io
> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan,
> Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin
> Y <kevin.y.li@intel.com>; Laszlo Ersek (lersek@redhat.com)
> <lersek@redhat.com>; leif.lindholm@linaro.org; afish@apple.com; Kinney,
> Michael D <michael.d.kinney@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> using CPUID(0x15) TSC leaf
>
> Donald:
> This change is a new feature. Now, it is not in edk2 feature planning list. If
> you want to catch it into 201908 stable tag, please get approve from
> Stewards first. I have cc this mail to all Stewards.
>
> For this patch, I have one minor comment. You add one PCD in UefiCpuPkg
> DEC. Please also add this PCD into UefiCpuPkg.uni.
>
> Thanks
> Liming
> > -----Original Message-----
> > From: Kuo, Donald
> > Sent: Thursday, August 15, 2019 11:02 AM
> > To: Dong, Eric <eric.dong@intel.com>; devel@edk2.groups.io; Gao,
> > Liming <liming.gao@intel.com>
> > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > Kevin Y <kevin.y.li@intel.com>
> > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library
> > by using CPUID(0x15) TSC leaf
> >
> > Hi Liming,
> >
> > As we plan to add new TimerLib to use CPUID Leaf 0x15 (CPU XTAL clock
> > frequency) to calculate TSC to resolve performance value unreliable
> concern.
> >
> > As the code review had got approved and planning into 201908 stable
> > tag. Please help to review whether any concern for 201908 stable tag.
> >
> > Thanks,
> > Donald
> >
> > > -----Original Message-----
> > > From: Dong, Eric
> > > Sent: Thursday, August 15, 2019 10:46 AM
> > > To: devel@edk2.groups.io; Kuo, Donald <donald.kuo@intel.com>
> > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > <rangasai.v.chaganty@intel.com>
> > > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > library by using CPUID(0x15) TSC leaf
> > >
> > > Reviewed-by: Eric Dong <eric.dong@intel.com>
> > >
> > > > -----Original Message-----
> > > > From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf
> > > > Of Donald Kuo
> > > > Sent: Tuesday, August 13, 2019 6:53 PM
> > > > To: devel@edk2.groups.io
> > > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > > Dong, Eric <eric.dong@intel.com>; Chan, Amy <amy.chan@intel.com>;
> > > > Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>
> > > > Subject: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library
> > > > by using
> > > > CPUID(0x15) TSC leaf
> > > >
> > > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> > > >
> > > > Cc: Ray Ni <ray.ni@intel.com>
> > > > Cc: Star Zeng <star.zeng@intel.com>
> > > > Cc: Eric Dong <eric.dong@intel.com>
> > > > Cc: Amy Chan <amy.chan@intel.com>
> > > > Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
> > > > Signed-off-by: Donald Kuo <donald.kuo@intel.com>
> > > > ---
> > > > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c | 41 +++
> > > > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf | 35 +++
> > > > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni | 17 ++
> > > > UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c | 274
> > > > +++++++++++++++++++++
> > > > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c | 81 ++++++
> > > > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf | 37 +++
> > > > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni | 17 ++
> > > > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c | 58 +++++
> > > > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf | 36 +++
> > > > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni | 17 ++
> > > > UefiCpuPkg/UefiCpuPkg.dec | 8 +
> > > > UefiCpuPkg/UefiCpuPkg.dsc | 3 +
> > > > 12 files changed, 624 insertions(+) create mode 100644
> > > > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > > > create mode 100644
> > > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > > create mode 100644
> > > UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > > > create mode 100644 UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > > > create mode 100644
> > > > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > > > create mode 100644
> > > > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > > create mode 100644
> > > UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > > > create mode 100644
> > > > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > > > create mode 100644
> > > > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > > > create mode 100644
> > > > UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > > >
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > > > b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > > > new file mode 100644
> > > > index 0000000000..6ddf917bad
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
> > > > @@ -0,0 +1,41 @@
> > > > +/** @file
> > > > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance as
> > > > +Base Timer
> > > > Library.
> > > > +
> > > > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > +
> > > > +**/
> > > > +
> > > > +#include <Base.h>
> > > > +#include <Library/TimerLib.h>
> > > > +#include <Library/BaseLib.h>
> > > > +
> > > > +/**
> > > > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > > > +
> > > > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > > > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > > > + In newer flavors of the CPU, core xtal frequency is returned in
> > > > + ECX or 0 if
> > > > not supported.
> > > > + @return The number of TSC counts per second.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +CpuidCoreClockCalculateTscFrequency (
> > > > + VOID
> > > > + );
> > > > +
> > > > +/**
> > > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > > +
> > > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > > +
> > > > + @return The frequency in Hz.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +InternalGetPerformanceCounterFrequency (
> > > > + VOID
> > > > + )
> > > > +{
> > > > + return CpuidCoreClockCalculateTscFrequency (); }
> > > > +
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > > b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > > new file mode 100644
> > > > index 0000000000..fd93adc5f1
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > > @@ -0,0 +1,35 @@
> > > > +## @file
> > > > +# Base CPU Timer Library
> > > > +#
> > > > +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > > +The performance # counter features are provided by the
> > > > +processors time
> > > > stamp counter.
> > > > +#
> > > > +# Copyright (c) 2019, Intel Corporation. All rights
> > > > +reserved.<BR> #
> > > > +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > > > +
> > > > +[Defines]
> > > > + INF_VERSION = 0x00010005
> > > > + BASE_NAME = BaseCpuTimerLib
> > > > + FILE_GUID = F10B5B91-D15A-496C-B044-B5235721AA08
> > > > + MODULE_TYPE = BASE
> > > > + VERSION_STRING = 1.0
> > > > + LIBRARY_CLASS = TimerLib|SEC PEI_CORE PEIM
> > > > + MODULE_UNI_FILE = BaseCpuTimerLib.uni
> > > > +
> > > > +[Sources]
> > > > + CpuTimerLib.c
> > > > + BaseCpuTimerLib.c
> > > > +
> > > > +[Packages]
> > > > + MdePkg/MdePkg.dec
> > > > + UefiCpuPkg/UefiCpuPkg.dec
> > > > +
> > > > +[LibraryClasses]
> > > > + BaseLib
> > > > + PcdLib
> > > > + DebugLib
> > > > +
> > > > +[Pcd]
> > > > + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> > > > +CONSUMES
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > > > b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > > > new file mode 100644
> > > > index 0000000000..fcf2b0fbcb
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
> > > > @@ -0,0 +1,17 @@
> > > > +// /** @file
> > > > +// Base CPU Timer Library
> > > > +//
> > > > +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > > +The performance // counter features are provided by the
> > > > +processors time
> > > > stamp counter.
> > > > +//
> > > > +// Copyright (c) 2019, Intel Corporation. All rights
> > > > +reserved.<BR> // // SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > +// // **/
> > > > +
> > > > +
> > > > +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> > > > Library"
> > > > +
> > > > +#string STR_MODULE_DESCRIPTION #language en-US "Provides
> > > basic
> > > > timer support using CPUID Leaf 0x15 XTAL frequency."
> > > > +
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > > > b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > > > new file mode 100644
> > > > index 0000000000..0b9e9384f5
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
> > > > @@ -0,0 +1,274 @@
> > > > +/** @file
> > > > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance of
> > > > +Timer
> > > Library.
> > > > +
> > > > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > +
> > > > +**/
> > > > +
> > > > +#include <Base.h>
> > > > +#include <Library/TimerLib.h>
> > > > +#include <Library/BaseLib.h>
> > > > +#include <Library/PcdLib.h>
> > > > +#include <Library/DebugLib.h>
> > > > +#include <Register/Cpuid.h>
> > > > +
> > > > +GUID mCpuCrystalFrequencyHobGuid = { 0xe1ec5ad0, 0x8569, 0x46bd,
> > > > +{ 0x8d, 0xcd, 0x3b, 0x9f, 0x6f, 0x45, 0x82, 0x7a } };
> > > > +
> > > > +/**
> > > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > > +
> > > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > > +
> > > > + @return The frequency in Hz.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +InternalGetPerformanceCounterFrequency (
> > > > + VOID
> > > > + );
> > > > +
> > > > +/**
> > > > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > > > +
> > > > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > > > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > > > + In newer flavors of the CPU, core xtal frequency is returned in
> > > > + ECX or 0 if
> > > > not supported.
> > > > + @return The number of TSC counts per second.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +CpuidCoreClockCalculateTscFrequency (
> > > > + VOID
> > > > + )
> > > > +{
> > > > + UINT64 TscFrequency;
> > > > + UINT64 CoreXtalFrequency;
> > > > + UINT32 RegEax;
> > > > + UINT32 RegEbx;
> > > > + UINT32 RegEcx;
> > > > +
> > > > + //
> > > > + // Use CPUID leaf 0x15 Time Stamp Counter and Nominal Core
> > > > + Crystal Clock Information // EBX returns 0 if not supported.
> > > > + ECX, if non zero,
> > > > provides Core Xtal Frequency in hertz.
> > > > + // TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX.
> > > > + //
> > > > + AsmCpuid (CPUID_TIME_STAMP_COUNTER, &RegEax, &RegEbx,
> > > &RegEcx,
> > > > NULL);
> > > > +
> > > > + //
> > > > + // If EBX returns 0, the XTAL ratio is not enumerated.
> > > > + //
> > > > + ASSERT (RegEbx != 0);
> > > > + //
> > > > + // If ECX returns 0, the XTAL frequency is not enumerated.
> > > > + //
> > > > + if (RegEcx == 0) {
> > > > + CoreXtalFrequency = PcdGet64
> > > > + (PcdCpuCoreCrystalClockFrequency);
> > > > + } else {
> > > > + CoreXtalFrequency = (UINT64) RegEcx; }
> > > > +
> > > > + //
> > > > + // Calculate TSC frequency = (ECX, Core Xtal Frequency) *
> > > > + EBX/EAX // TscFrequency = DivU64x32 (MultU64x32
> > > > + (CoreXtalFrequency, RegEbx)
> > > > + + (UINT64)(RegEax >> 1), RegEax);
> > > > +
> > > > + return TscFrequency;
> > > > +}
> > > > +
> > > > +/**
> > > > + Stalls the CPU for at least the given number of ticks.
> > > > +
> > > > + Stalls the CPU for at least the given number of ticks. It's
> > > > + invoked by
> > > > + MicroSecondDelay() and NanoSecondDelay().
> > > > +
> > > > + @param Delay A period of time to delay in ticks.
> > > > +
> > > > +**/
> > > > +VOID
> > > > +InternalCpuDelay (
> > > > + IN UINT64 Delay
> > > > + )
> > > > +{
> > > > + UINT64 Ticks;
> > > > +
> > > > + //
> > > > + // The target timer count is calculated here // Ticks =
> > > > + AsmReadTsc() + Delay;
> > > > +
> > > > + //
> > > > + // Wait until time out
> > > > + // Timer wrap-arounds are NOT handled correctly by this function.
> > > > + // Thus, this function must be called within 10 years of reset
> > > > +since
> > > > + // Intel guarantees a minimum of 10 years before the TSC wraps.
> > > > + //
> > > > + while (AsmReadTsc() <= Ticks) {
> > > > + CpuPause();
> > > > + }
> > > > +}
> > > > +
> > > > +/**
> > > > + Stalls the CPU for at least the given number of microseconds.
> > > > +
> > > > + Stalls the CPU for the number of microseconds specified by
> > > MicroSeconds.
> > > > +
> > > > + @param[in] MicroSeconds The minimum number of microseconds
> to
> > > > delay.
> > > > +
> > > > + @return MicroSeconds
> > > > +
> > > > +**/
> > > > +UINTN
> > > > +EFIAPI
> > > > +MicroSecondDelay (
> > > > + IN UINTN MicroSeconds
> > > > + )
> > > > +{
> > > > +
> > > > + InternalCpuDelay (
> > > > + DivU64x32 (
> > > > + MultU64x64 (
> > > > + MicroSeconds,
> > > > + InternalGetPerformanceCounterFrequency ()
> > > > + ),
> > > > + 1000000u
> > > > + )
> > > > + );
> > > > +
> > > > + return MicroSeconds;
> > > > +}
> > > > +
> > > > +/**
> > > > + Stalls the CPU for at least the given number of nanoseconds.
> > > > +
> > > > + Stalls the CPU for the number of nanoseconds specified by
> NanoSeconds.
> > > > +
> > > > + @param NanoSeconds The minimum number of nanoseconds to
> delay.
> > > > +
> > > > + @return NanoSeconds
> > > > +
> > > > +**/
> > > > +UINTN
> > > > +EFIAPI
> > > > +NanoSecondDelay (
> > > > + IN UINTN NanoSeconds
> > > > + )
> > > > +{
> > > > +
> > > > + InternalCpuDelay (
> > > > + DivU64x32 (
> > > > + MultU64x64 (
> > > > + NanoSeconds,
> > > > + InternalGetPerformanceCounterFrequency ()
> > > > + ),
> > > > + 1000000000u
> > > > + )
> > > > + );
> > > > +
> > > > + return NanoSeconds;
> > > > +}
> > > > +
> > > > +/**
> > > > + Retrieves the current value of a 64-bit free running performance
> counter.
> > > > +
> > > > + Retrieves the current value of a 64-bit free running
> > > > + performance counter. The counter can either count up by 1 or count
> down by 1.
> > > > + If the physical performance counter counts by a larger
> > > > + increment, then the counter values must be translated. The
> > > > + properties of the counter can be retrieved from
> GetPerformanceCounterProperties().
> > > > +
> > > > + @return The current value of the free running performance counter.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +EFIAPI
> > > > +GetPerformanceCounter (
> > > > + VOID
> > > > + )
> > > > +{
> > > > + return AsmReadTsc ();
> > > > +}
> > > > +
> > > > +/**
> > > > + Retrieves the 64-bit frequency in Hz and the range of
> > > > +performance counter
> > > > + values.
> > > > +
> > > > + If StartValue is not NULL, then the value that the performance
> > > > + counter starts with immediately after is it rolls over is
> > > > + returned in StartValue. If EndValue is not NULL, then the value
> > > > + that the performance counter end with immediately before it
> > > > + rolls over is returned in EndValue. The 64-bit frequency of the
> > > > + performance counter in Hz is always returned. If StartValue is
> > > > + less than EndValue, then the performance counter counts up. If
> > > > + StartValue is greater than EndValue, then the performance
> > > > + counter counts down. For example, a 64-bit free running counter
> > > > + that counts up would have a StartValue of
> > > > + 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running
> > > > + counter
> > > > that counts down would have a StartValue of 0xFFFFFF and an
> > > > EndValue of
> > > 0.
> > > > +
> > > > + @param StartValue The value the performance counter starts
> > > > + with when
> > > > it
> > > > + rolls over.
> > > > + @param EndValue The value that the performance counter ends
> with
> > > > before
> > > > + it rolls over.
> > > > +
> > > > + @return The frequency in Hz.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +EFIAPI
> > > > +GetPerformanceCounterProperties (
> > > > + OUT UINT64 *StartValue, OPTIONAL
> > > > + OUT UINT64 *EndValue OPTIONAL
> > > > + )
> > > > +{
> > > > + if (StartValue != NULL) {
> > > > + *StartValue = 0;
> > > > + }
> > > > +
> > > > + if (EndValue != NULL) {
> > > > + *EndValue = 0xffffffffffffffffULL; } return
> > > > + InternalGetPerformanceCounterFrequency (); }
> > > > +
> > > > +/**
> > > > + Converts elapsed ticks of performance counter to time in
> nanoseconds.
> > > > +
> > > > + This function converts the elapsed ticks of running performance
> > > > + counter to time value in unit of nanoseconds.
> > > > +
> > > > + @param Ticks The number of elapsed ticks of running
> performance
> > > > counter.
> > > > +
> > > > + @return The elapsed time in nanoseconds.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +EFIAPI
> > > > +GetTimeInNanoSecond (
> > > > + IN UINT64 Ticks
> > > > + )
> > > > +{
> > > > + UINT64 Frequency;
> > > > + UINT64 NanoSeconds;
> > > > + UINT64 Remainder;
> > > > + INTN Shift;
> > > > +
> > > > + Frequency = GetPerformanceCounterProperties (NULL, NULL);
> > > > +
> > > > + //
> > > > + // Ticks
> > > > + // Time = --------- x 1,000,000,000
> > > > + // Frequency
> > > > + //
> > > > + NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency,
> > > > + &Remainder), 1000000000u);
> > > > +
> > > > + //
> > > > + // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.
> > > > + // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder
> > > > + should <
> > > > + 2^(64-30) = 2^34, // i.e. highest bit set in Remainder should <= 33.
> > > > + //
> > > > + Shift = MAX (0, HighBitSet64 (Remainder) - 33); Remainder =
> > > > + RShiftU64 (Remainder, (UINTN) Shift); Frequency = RShiftU64
> > > > + (Frequency, (UINTN) Shift); NanoSeconds += DivU64x64Remainder
> > > > + (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);
> > > > +
> > > > + return NanoSeconds;
> > > > +}
> > > > +
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > > > b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > > > new file mode 100644
> > > > index 0000000000..2d0ef6ab07
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
> > > > @@ -0,0 +1,81 @@
> > > > +/** @file
> > > > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance of
> > > > +Timer
> > > Library.
> > > > +
> > > > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > +
> > > > +**/
> > > > +
> > > > +#include <PiDxe.h>
> > > > +#include <Library/TimerLib.h>
> > > > +#include <Library/BaseLib.h>
> > > > +#include <Library/HobLib.h>
> > > > +
> > > > +extern GUID mCpuCrystalFrequencyHobGuid;
> > > > +
> > > > +/**
> > > > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > > > +
> > > > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > > > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > > > + In newer flavors of the CPU, core xtal frequency is returned in
> > > > + ECX or 0 if
> > > > not supported.
> > > > + @return The number of TSC counts per second.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +CpuidCoreClockCalculateTscFrequency (
> > > > + VOID
> > > > + );
> > > > +
> > > > +//
> > > > +// Cached CPU Crystal counter frequency //
> > > > +UINT64 mCpuCrystalCounterFrequency = 0;
> > > > +
> > > > +
> > > > +/**
> > > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > > +
> > > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > > +
> > > > + @return The frequency in Hz.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +InternalGetPerformanceCounterFrequency (
> > > > + VOID
> > > > + )
> > > > +{
> > > > + return mCpuCrystalCounterFrequency; }
> > > > +
> > > > +/**
> > > > + The constructor function is to initialize CpuCrystalCounterFrequency.
> > > > +
> > > > + @param ImageHandle The firmware allocated handle for the EFI
> image.
> > > > + @param SystemTable A pointer to the EFI System Table.
> > > > +
> > > > + @retval EFI_SUCCESS The constructor always returns
> > > RETURN_SUCCESS.
> > > > +
> > > > +**/
> > > > +EFI_STATUS
> > > > +EFIAPI
> > > > +DxeCpuTimerLibConstructor (
> > > > + IN EFI_HANDLE ImageHandle,
> > > > + IN EFI_SYSTEM_TABLE *SystemTable
> > > > + )
> > > > +{
> > > > + EFI_HOB_GUID_TYPE *GuidHob;
> > > > +
> > > > + //
> > > > + // Initialize CpuCrystalCounterFrequency // GuidHob =
> > > > + GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid); if (GuidHob !=
> > > > + NULL) {
> > > > + mCpuCrystalCounterFrequency = *(UINT64*)GET_GUID_HOB_DATA
> > > > + (GuidHob); } else {
> > > > + mCpuCrystalCounterFrequency =
> > > CpuidCoreClockCalculateTscFrequency
> > > > + (); }
> > > > +
> > > > + return EFI_SUCCESS;
> > > > +}
> > > > +
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > > b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > > new file mode 100644
> > > > index 0000000000..6c83549c87
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > > @@ -0,0 +1,37 @@
> > > > +## @file
> > > > +# DXE CPU Timer Library
> > > > +#
> > > > +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > > +The performance # counter features are provided by the
> > > > +processors time
> > > > stamp counter.
> > > > +#
> > > > +# Copyright (c) 2019, Intel Corporation. All rights
> > > > +reserved.<BR> #
> > > > +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > > > +
> > > > +[Defines]
> > > > + INF_VERSION = 0x00010005
> > > > + BASE_NAME = DxeCpuTimerLib
> > > > + FILE_GUID = F22CC0DA-E7DB-4E4D-ABE2-A608188233A2
> > > > + MODULE_TYPE = DXE_DRIVER
> > > > + VERSION_STRING = 1.0
> > > > + LIBRARY_CLASS = TimerLib|DXE_CORE DXE_DRIVER
> > > > DXE_RUNTIME_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION
> > > UEFI_DRIVER
> > > > SMM_CORE
> > > > + CONSTRUCTOR = DxeCpuTimerLibConstructor
> > > > + MODULE_UNI_FILE = DxeCpuTimerLib.uni
> > > > +
> > > > +[Sources]
> > > > + CpuTimerLib.c
> > > > + DxeCpuTimerLib.c
> > > > +
> > > > +[Packages]
> > > > + MdePkg/MdePkg.dec
> > > > + UefiCpuPkg/UefiCpuPkg.dec
> > > > +
> > > > +[LibraryClasses]
> > > > + BaseLib
> > > > + PcdLib
> > > > + DebugLib
> > > > + HobLib
> > > > +
> > > > +[Pcd]
> > > > + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> > > > +CONSUMES
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > > > b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > > > new file mode 100644
> > > > index 0000000000..f55b92abac
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
> > > > @@ -0,0 +1,17 @@
> > > > +// /** @file
> > > > +// DXE CPU Timer Library
> > > > +//
> > > > +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > > +The performance // counter features are provided by the
> > > > +processors time
> > > > stamp counter.
> > > > +//
> > > > +// Copyright (c) 2019, Intel Corporation. All rights
> > > > +reserved.<BR> // // SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > +// // **/
> > > > +
> > > > +
> > > > +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> > > > Library"
> > > > +
> > > > +#string STR_MODULE_DESCRIPTION #language en-US "Provides
> > > basic
> > > > timer support using CPUID Leaf 0x15 XTAL frequency."
> > > > +
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > > > b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > > > new file mode 100644
> > > > index 0000000000..91a7212056
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
> > > > @@ -0,0 +1,58 @@
> > > > +/** @file
> > > > + CPUID Leaf 0x15 for Core Crystal Clock frequency instance as
> > > > +PEI Timer
> > > > Library.
> > > > +
> > > > + Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
> > > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > +
> > > > +**/
> > > > +
> > > > +#include <PiPei.h>
> > > > +#include <Library/TimerLib.h>
> > > > +#include <Library/BaseLib.h>
> > > > +#include <Library/HobLib.h>
> > > > +#include <Library/DebugLib.h>
> > > > +
> > > > +extern GUID mCpuCrystalFrequencyHobGuid;
> > > > +
> > > > +/**
> > > > + CPUID Leaf 0x15 for Core Crystal Clock Frequency.
> > > > +
> > > > + The TSC counting frequency is determined by using CPUID leaf 0x15.
> > > > Frequency in MHz = Core XTAL frequency * EBX/EAX.
> > > > + In newer flavors of the CPU, core xtal frequency is returned in
> > > > + ECX or 0 if
> > > > not supported.
> > > > + @return The number of TSC counts per second.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +CpuidCoreClockCalculateTscFrequency (
> > > > + VOID
> > > > + );
> > > > +
> > > > +/**
> > > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > > +
> > > > + Internal function to retrieves the 64-bit frequency in Hz.
> > > > +
> > > > + @return The frequency in Hz.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +InternalGetPerformanceCounterFrequency (
> > > > + VOID
> > > > + )
> > > > +{
> > > > + UINT64 *CpuCrystalCounterFrequency;
> > > > + EFI_HOB_GUID_TYPE *GuidHob;
> > > > +
> > > > + CpuCrystalCounterFrequency = NULL; GuidHob = GetFirstGuidHob
> > > > + (&mCpuCrystalFrequencyHobGuid); if (GuidHob == NULL) {
> > > > + CpuCrystalCounterFrequency =
> > > > (UINT64*)BuildGuidHob(&mCpuCrystalFrequencyHobGuid, sizeof
> > > > (*CpuCrystalCounterFrequency));
> > > > + ASSERT (CpuCrystalCounterFrequency != NULL);
> > > > + *CpuCrystalCounterFrequency =
> > > > + CpuidCoreClockCalculateTscFrequency
> > > > + (); } else {
> > > > + CpuCrystalCounterFrequency = (UINT64*)GET_GUID_HOB_DATA
> > > > (GuidHob);
> > > > + }
> > > > +
> > > > + return *CpuCrystalCounterFrequency; }
> > > > +
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > > > b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > > > new file mode 100644
> > > > index 0000000000..7af0fc44a6
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > > > @@ -0,0 +1,36 @@
> > > > +## @file
> > > > +# PEI CPU Timer Library
> > > > +#
> > > > +# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > > +The performance # counter features are provided by the
> > > > +processors time
> > > > stamp counter.
> > > > +#
> > > > +# Copyright (c) 2019, Intel Corporation. All rights
> > > > +reserved.<BR> #
> > > > +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > > > +
> > > > +[Defines]
> > > > + INF_VERSION = 0x00010005
> > > > + BASE_NAME = PeiCpuTimerLib
> > > > + FILE_GUID = 2B13DE00-1A5F-4DD7-A298-01B08AF1015A
> > > > + MODULE_TYPE = BASE
> > > > + VERSION_STRING = 1.0
> > > > + LIBRARY_CLASS = TimerLib|PEI_CORE PEIM
> > > > + MODULE_UNI_FILE = PeiCpuTimerLib.uni
> > > > +
> > > > +[Sources]
> > > > + CpuTimerLib.c
> > > > + PeiCpuTimerLib.c
> > > > +
> > > > +[Packages]
> > > > + MdePkg/MdePkg.dec
> > > > + UefiCpuPkg/UefiCpuPkg.dec
> > > > +
> > > > +[LibraryClasses]
> > > > + BaseLib
> > > > + PcdLib
> > > > + DebugLib
> > > > + HobLib
> > > > +
> > > > +[Pcd]
> > > > + gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ##
> > > > +CONSUMES
> > > > diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > > > b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > > > new file mode 100644
> > > > index 0000000000..49beb44908
> > > > --- /dev/null
> > > > +++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
> > > > @@ -0,0 +1,17 @@
> > > > +// /** @file
> > > > +// PEI CPU Timer Library
> > > > +//
> > > > +// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency.
> > > > +The performance // counter features are provided by the
> > > > +processors time
> > > > stamp counter.
> > > > +//
> > > > +// Copyright (c) 2019, Intel Corporation. All rights
> > > > +reserved.<BR> // // SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > +// // **/
> > > > +
> > > > +
> > > > +#string STR_MODULE_ABSTRACT #language en-US "CPU Timer
> > > > Library"
> > > > +
> > > > +#string STR_MODULE_DESCRIPTION #language en-US "Provides
> > > basic
> > > > timer support using CPUID Leaf 0x15 XTAL frequency."
> > > > +
> > > > diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
> > > > index 14ddaa8633..a94bd2ea30 100644
> > > > --- a/UefiCpuPkg/UefiCpuPkg.dec
> > > > +++ b/UefiCpuPkg/UefiCpuPkg.dec
> > > > @@ -211,6 +211,14 @@
> > > > # @Prompt If CPU features will be initialized during S3 resume.
> > > >
> > > >
> gUefiCpuPkgTokenSpaceGuid.PcdCpuFeaturesInitOnS3Resume|FALSE|BOO
> > > > LEAN|0x0000001D
> > > >
> > > > + ## Specifies CPUID Leaf 0x15 Time Stamp Counter and Nominal
> > > > + Core
> > > > Crystal Clock Frequency.
> > > > + # TSC Frequency = ECX (core crystal clock frequency) * EBX/EAX.
> > > > + # Intel Xeon Processor Scalable Family with CPUID signature 06_55H
> =
> > > > 25000000 (25MHz)
> > > > + # 6th and 7th generation Intel Core processors and Intel Xeon W
> > > > Processor Family = 24000000 (24MHz)
> > > > + # Intel Atom processors based on Goldmont Microarchitecture with
> > > > CPUID signature 06_5CH = 19200000 (19.2MHz)
> > > > + # @Prompt Core Crystal Clock Frequency is for CPUID Leaf
> > > > + 0x15.ECX
> > > > +
> > > > +
> > > >
> > >
> gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency|24000000|
> > > > UIN
> > > > + T64|0x32132113
> > > > +
> > > > [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic,
> PcdsDynamicEx]
> > > > ## Specifies max supported number of Logical Processors.
> > > > # @Prompt Configure max supported number of Logical Processors
> > > > diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
> > > > index bf690d3978..e7dfe30eda 100644
> > > > --- a/UefiCpuPkg/UefiCpuPkg.dsc
> > > > +++ b/UefiCpuPkg/UefiCpuPkg.dsc
> > > > @@ -101,6 +101,9 @@
> > > > UefiCpuPkg/CpuIoPei/CpuIoPei.inf
> > > >
> > > >
> > >
> UefiCpuPkg/Library/SecPeiDxeTimerLibUefiCpu/SecPeiDxeTimerLibUefiCpu
> > > .i
> > > > nf
> > > > UefiCpuPkg/Application/Cpuid/Cpuid.inf
> > > > + UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
> > > > + UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
> > > > + UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
> > > >
> > > > [Components.IA32, Components.X64]
> > > > UefiCpuPkg/CpuDxe/CpuDxe.inf
> > > > --
> > > > 2.14.2.windows.3
> > > >
> > > >
> > > >
[-- Attachment #2: Type: message/rfc822, Size: 27250 bytes --]
From: "Kuo, Donald" <donald.kuo@intel.com>
To: "devel@edk2.groups.io" <devel@edk2.groups.io>
Cc: "Ni, Ray" <ray.ni@intel.com>, "Zeng, Star" <star.zeng@intel.com>, "Dong, Eric" <eric.dong@intel.com>, "Chan, Amy" <amy.chan@intel.com>, "Chaganty, Rangasai V" <rangasai.v.chaganty@intel.com>
Subject: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
Date: Thu, 15 Aug 2019 04:37:48 +0000
Message-ID: <15BAFEB54B2C61CD.23161@groups.io>
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1909
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Amy Chan <amy.chan@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Signed-off-by: Donald Kuo <donald.kuo@intel.com>
---
UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c | 41 +++
UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf | 35 +++
UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni | 17 ++
UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c | 274 +++++++++++++++++++++
UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c | 81 ++++++
UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf | 37 +++
UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni | 17 ++
UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c | 58 +++++
UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf | 36 +++
UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni | 17 ++
UefiCpuPkg/UefiCpuPkg.dec | 8 +
UefiCpuPkg/UefiCpuPkg.dsc | 3 +
UefiCpuPkg/UefiCpuPkg.uni | 10 +
13 files changed, 634 insertions(+)
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
create mode 100644 UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
new file mode 100644
index 0000000000..6ddf917bad
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.c
@@ -0,0 +1,41 @@
+/** @file
+ CPUID Leaf 0x15 for Core Crystal Clock frequency instance as Base Timer Library.
+
+ Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+
+/**
+ CPUID Leaf 0x15 for Core Crystal Clock Frequency.
+
+ The TSC counting frequency is determined by using CPUID leaf 0x15. Frequency in MHz = Core XTAL frequency * EBX/EAX.
+ In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if not supported.
+ @return The number of TSC counts per second.
+
+**/
+UINT64
+CpuidCoreClockCalculateTscFrequency (
+ VOID
+ );
+
+/**
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+InternalGetPerformanceCounterFrequency (
+ VOID
+ )
+{
+ return CpuidCoreClockCalculateTscFrequency ();
+}
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
new file mode 100644
index 0000000000..fd93adc5f1
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
@@ -0,0 +1,35 @@
+## @file
+# Base CPU Timer Library
+#
+# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+# counter features are provided by the processors time stamp counter.
+#
+# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = BaseCpuTimerLib
+ FILE_GUID = F10B5B91-D15A-496C-B044-B5235721AA08
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = TimerLib|SEC PEI_CORE PEIM
+ MODULE_UNI_FILE = BaseCpuTimerLib.uni
+
+[Sources]
+ CpuTimerLib.c
+ BaseCpuTimerLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ PcdLib
+ DebugLib
+
+[Pcd]
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ## CONSUMES
diff --git a/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
new file mode 100644
index 0000000000..fcf2b0fbcb
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.uni
@@ -0,0 +1,17 @@
+// /** @file
+// Base CPU Timer Library
+//
+// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+// counter features are provided by the processors time stamp counter.
+//
+// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "CPU Timer Library"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Provides basic timer support using CPUID Leaf 0x15 XTAL frequency."
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
new file mode 100644
index 0000000000..0b9e9384f5
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/CpuTimerLib.c
@@ -0,0 +1,274 @@
+/** @file
+ CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer Library.
+
+ Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+#include <Library/PcdLib.h>
+#include <Library/DebugLib.h>
+#include <Register/Cpuid.h>
+
+GUID mCpuCrystalFrequencyHobGuid = { 0xe1ec5ad0, 0x8569, 0x46bd, { 0x8d, 0xcd, 0x3b, 0x9f, 0x6f, 0x45, 0x82, 0x7a } };
+
+/**
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+InternalGetPerformanceCounterFrequency (
+ VOID
+ );
+
+/**
+ CPUID Leaf 0x15 for Core Crystal Clock Frequency.
+
+ The TSC counting frequency is determined by using CPUID leaf 0x15. Frequency in MHz = Core XTAL frequency * EBX/EAX.
+ In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if not supported.
+ @return The number of TSC counts per second.
+
+**/
+UINT64
+CpuidCoreClockCalculateTscFrequency (
+ VOID
+ )
+{
+ UINT64 TscFrequency;
+ UINT64 CoreXtalFrequency;
+ UINT32 RegEax;
+ UINT32 RegEbx;
+ UINT32 RegEcx;
+
+ //
+ // Use CPUID leaf 0x15 Time Stamp Counter and Nominal Core Crystal Clock Information
+ // EBX returns 0 if not supported. ECX, if non zero, provides Core Xtal Frequency in hertz.
+ // TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX.
+ //
+ AsmCpuid (CPUID_TIME_STAMP_COUNTER, &RegEax, &RegEbx, &RegEcx, NULL);
+
+ //
+ // If EBX returns 0, the XTAL ratio is not enumerated.
+ //
+ ASSERT (RegEbx != 0);
+ //
+ // If ECX returns 0, the XTAL frequency is not enumerated.
+ //
+ if (RegEcx == 0) {
+ CoreXtalFrequency = PcdGet64 (PcdCpuCoreCrystalClockFrequency);
+ } else {
+ CoreXtalFrequency = (UINT64) RegEcx;
+ }
+
+ //
+ // Calculate TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX
+ //
+ TscFrequency = DivU64x32 (MultU64x32 (CoreXtalFrequency, RegEbx) + (UINT64)(RegEax >> 1), RegEax);
+
+ return TscFrequency;
+}
+
+/**
+ Stalls the CPU for at least the given number of ticks.
+
+ Stalls the CPU for at least the given number of ticks. It's invoked by
+ MicroSecondDelay() and NanoSecondDelay().
+
+ @param Delay A period of time to delay in ticks.
+
+**/
+VOID
+InternalCpuDelay (
+ IN UINT64 Delay
+ )
+{
+ UINT64 Ticks;
+
+ //
+ // The target timer count is calculated here
+ //
+ Ticks = AsmReadTsc() + Delay;
+
+ //
+ // Wait until time out
+ // Timer wrap-arounds are NOT handled correctly by this function.
+ // Thus, this function must be called within 10 years of reset since
+ // Intel guarantees a minimum of 10 years before the TSC wraps.
+ //
+ while (AsmReadTsc() <= Ticks) {
+ CpuPause();
+ }
+}
+
+/**
+ Stalls the CPU for at least the given number of microseconds.
+
+ Stalls the CPU for the number of microseconds specified by MicroSeconds.
+
+ @param[in] MicroSeconds The minimum number of microseconds to delay.
+
+ @return MicroSeconds
+
+**/
+UINTN
+EFIAPI
+MicroSecondDelay (
+ IN UINTN MicroSeconds
+ )
+{
+
+ InternalCpuDelay (
+ DivU64x32 (
+ MultU64x64 (
+ MicroSeconds,
+ InternalGetPerformanceCounterFrequency ()
+ ),
+ 1000000u
+ )
+ );
+
+ return MicroSeconds;
+}
+
+/**
+ Stalls the CPU for at least the given number of nanoseconds.
+
+ Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
+
+ @param NanoSeconds The minimum number of nanoseconds to delay.
+
+ @return NanoSeconds
+
+**/
+UINTN
+EFIAPI
+NanoSecondDelay (
+ IN UINTN NanoSeconds
+ )
+{
+
+ InternalCpuDelay (
+ DivU64x32 (
+ MultU64x64 (
+ NanoSeconds,
+ InternalGetPerformanceCounterFrequency ()
+ ),
+ 1000000000u
+ )
+ );
+
+ return NanoSeconds;
+}
+
+/**
+ Retrieves the current value of a 64-bit free running performance counter.
+
+ Retrieves the current value of a 64-bit free running performance counter. The
+ counter can either count up by 1 or count down by 1. If the physical
+ performance counter counts by a larger increment, then the counter values
+ must be translated. The properties of the counter can be retrieved from
+ GetPerformanceCounterProperties().
+
+ @return The current value of the free running performance counter.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounter (
+ VOID
+ )
+{
+ return AsmReadTsc ();
+}
+
+/**
+ Retrieves the 64-bit frequency in Hz and the range of performance counter
+ values.
+
+ If StartValue is not NULL, then the value that the performance counter starts
+ with immediately after is it rolls over is returned in StartValue. If
+ EndValue is not NULL, then the value that the performance counter end with
+ immediately before it rolls over is returned in EndValue. The 64-bit
+ frequency of the performance counter in Hz is always returned. If StartValue
+ is less than EndValue, then the performance counter counts up. If StartValue
+ is greater than EndValue, then the performance counter counts down. For
+ example, a 64-bit free running counter that counts up would have a StartValue
+ of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
+ that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
+
+ @param StartValue The value the performance counter starts with when it
+ rolls over.
+ @param EndValue The value that the performance counter ends with before
+ it rolls over.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounterProperties (
+ OUT UINT64 *StartValue, OPTIONAL
+ OUT UINT64 *EndValue OPTIONAL
+ )
+{
+ if (StartValue != NULL) {
+ *StartValue = 0;
+ }
+
+ if (EndValue != NULL) {
+ *EndValue = 0xffffffffffffffffULL;
+ }
+ return InternalGetPerformanceCounterFrequency ();
+}
+
+/**
+ Converts elapsed ticks of performance counter to time in nanoseconds.
+
+ This function converts the elapsed ticks of running performance counter to
+ time value in unit of nanoseconds.
+
+ @param Ticks The number of elapsed ticks of running performance counter.
+
+ @return The elapsed time in nanoseconds.
+
+**/
+UINT64
+EFIAPI
+GetTimeInNanoSecond (
+ IN UINT64 Ticks
+ )
+{
+ UINT64 Frequency;
+ UINT64 NanoSeconds;
+ UINT64 Remainder;
+ INTN Shift;
+
+ Frequency = GetPerformanceCounterProperties (NULL, NULL);
+
+ //
+ // Ticks
+ // Time = --------- x 1,000,000,000
+ // Frequency
+ //
+ NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency, &Remainder), 1000000000u);
+
+ //
+ // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.
+ // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should < 2^(64-30) = 2^34,
+ // i.e. highest bit set in Remainder should <= 33.
+ //
+ Shift = MAX (0, HighBitSet64 (Remainder) - 33);
+ Remainder = RShiftU64 (Remainder, (UINTN) Shift);
+ Frequency = RShiftU64 (Frequency, (UINTN) Shift);
+ NanoSeconds += DivU64x64Remainder (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);
+
+ return NanoSeconds;
+}
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
new file mode 100644
index 0000000000..2d0ef6ab07
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.c
@@ -0,0 +1,81 @@
+/** @file
+ CPUID Leaf 0x15 for Core Crystal Clock frequency instance of Timer Library.
+
+ Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+#include <Library/HobLib.h>
+
+extern GUID mCpuCrystalFrequencyHobGuid;
+
+/**
+ CPUID Leaf 0x15 for Core Crystal Clock Frequency.
+
+ The TSC counting frequency is determined by using CPUID leaf 0x15. Frequency in MHz = Core XTAL frequency * EBX/EAX.
+ In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if not supported.
+ @return The number of TSC counts per second.
+
+**/
+UINT64
+CpuidCoreClockCalculateTscFrequency (
+ VOID
+ );
+
+//
+// Cached CPU Crystal counter frequency
+//
+UINT64 mCpuCrystalCounterFrequency = 0;
+
+
+/**
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+InternalGetPerformanceCounterFrequency (
+ VOID
+ )
+{
+ return mCpuCrystalCounterFrequency;
+}
+
+/**
+ The constructor function is to initialize CpuCrystalCounterFrequency.
+
+ @param ImageHandle The firmware allocated handle for the EFI image.
+ @param SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+DxeCpuTimerLibConstructor (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_HOB_GUID_TYPE *GuidHob;
+
+ //
+ // Initialize CpuCrystalCounterFrequency
+ //
+ GuidHob = GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid);
+ if (GuidHob != NULL) {
+ mCpuCrystalCounterFrequency = *(UINT64*)GET_GUID_HOB_DATA (GuidHob);
+ } else {
+ mCpuCrystalCounterFrequency = CpuidCoreClockCalculateTscFrequency ();
+ }
+
+ return EFI_SUCCESS;
+}
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
new file mode 100644
index 0000000000..6c83549c87
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
@@ -0,0 +1,37 @@
+## @file
+# DXE CPU Timer Library
+#
+# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+# counter features are provided by the processors time stamp counter.
+#
+# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = DxeCpuTimerLib
+ FILE_GUID = F22CC0DA-E7DB-4E4D-ABE2-A608188233A2
+ MODULE_TYPE = DXE_DRIVER
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = TimerLib|DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION UEFI_DRIVER SMM_CORE
+ CONSTRUCTOR = DxeCpuTimerLibConstructor
+ MODULE_UNI_FILE = DxeCpuTimerLib.uni
+
+[Sources]
+ CpuTimerLib.c
+ DxeCpuTimerLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ PcdLib
+ DebugLib
+ HobLib
+
+[Pcd]
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ## CONSUMES
diff --git a/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
new file mode 100644
index 0000000000..f55b92abac
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.uni
@@ -0,0 +1,17 @@
+// /** @file
+// DXE CPU Timer Library
+//
+// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+// counter features are provided by the processors time stamp counter.
+//
+// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "CPU Timer Library"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Provides basic timer support using CPUID Leaf 0x15 XTAL frequency."
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
new file mode 100644
index 0000000000..91a7212056
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.c
@@ -0,0 +1,58 @@
+/** @file
+ CPUID Leaf 0x15 for Core Crystal Clock frequency instance as PEI Timer Library.
+
+ Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiPei.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+#include <Library/HobLib.h>
+#include <Library/DebugLib.h>
+
+extern GUID mCpuCrystalFrequencyHobGuid;
+
+/**
+ CPUID Leaf 0x15 for Core Crystal Clock Frequency.
+
+ The TSC counting frequency is determined by using CPUID leaf 0x15. Frequency in MHz = Core XTAL frequency * EBX/EAX.
+ In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if not supported.
+ @return The number of TSC counts per second.
+
+**/
+UINT64
+CpuidCoreClockCalculateTscFrequency (
+ VOID
+ );
+
+/**
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ Internal function to retrieves the 64-bit frequency in Hz.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+InternalGetPerformanceCounterFrequency (
+ VOID
+ )
+{
+ UINT64 *CpuCrystalCounterFrequency;
+ EFI_HOB_GUID_TYPE *GuidHob;
+
+ CpuCrystalCounterFrequency = NULL;
+ GuidHob = GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid);
+ if (GuidHob == NULL) {
+ CpuCrystalCounterFrequency = (UINT64*)BuildGuidHob(&mCpuCrystalFrequencyHobGuid, sizeof (*CpuCrystalCounterFrequency));
+ ASSERT (CpuCrystalCounterFrequency != NULL);
+ *CpuCrystalCounterFrequency = CpuidCoreClockCalculateTscFrequency ();
+ } else {
+ CpuCrystalCounterFrequency = (UINT64*)GET_GUID_HOB_DATA (GuidHob);
+ }
+
+ return *CpuCrystalCounterFrequency;
+}
+
diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
new file mode 100644
index 0000000000..7af0fc44a6
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
@@ -0,0 +1,36 @@
+## @file
+# PEI CPU Timer Library
+#
+# Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+# counter features are provided by the processors time stamp counter.
+#
+# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = PeiCpuTimerLib
+ FILE_GUID = 2B13DE00-1A5F-4DD7-A298-01B08AF1015A
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = TimerLib|PEI_CORE PEIM
+ MODULE_UNI_FILE = PeiCpuTimerLib.uni
+
+[Sources]
+ CpuTimerLib.c
+ PeiCpuTimerLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ PcdLib
+ DebugLib
+ HobLib
+
+[Pcd]
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency ## CONSUMES
diff --git a/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
new file mode 100644
index 0000000000..49beb44908
--- /dev/null
+++ b/UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.uni
@@ -0,0 +1,17 @@
+// /** @file
+// PEI CPU Timer Library
+//
+// Provides basic timer support using CPUID Leaf 0x15 XTAL frequency. The performance
+// counter features are provided by the processors time stamp counter.
+//
+// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "CPU Timer Library"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Provides basic timer support using CPUID Leaf 0x15 XTAL frequency."
+
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index 14ddaa8633..86ad61f64b 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -211,6 +211,14 @@
# @Prompt If CPU features will be initialized during S3 resume.
gUefiCpuPkgTokenSpaceGuid.PcdCpuFeaturesInitOnS3Resume|FALSE|BOOLEAN|0x0000001D
+ ## Specifies CPUID Leaf 0x15 Time Stamp Counter and Nominal Core Crystal Clock Frequency.
+ # TSC Frequency = ECX (core crystal clock frequency) * EBX/EAX.
+ # Intel Xeon Processor Scalable Family with CPUID signature 06_55H = 25000000 (25MHz)
+ # 6th and 7th generation Intel Core processors and Intel Xeon W Processor Family = 24000000 (24MHz)
+ # Intel Atom processors based on Goldmont Microarchitecture with CPUID signature 06_5CH = 19200000 (19.2MHz)
+ # @Prompt This PCD is the nominal frequency of the core crystal clock in Hz as is CPUID Leaf 0x15:ECX
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency|24000000|UINT64|0x32132113
+
[PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
## Specifies max supported number of Logical Processors.
# @Prompt Configure max supported number of Logical Processors
diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
index bf690d3978..e7dfe30eda 100644
--- a/UefiCpuPkg/UefiCpuPkg.dsc
+++ b/UefiCpuPkg/UefiCpuPkg.dsc
@@ -101,6 +101,9 @@
UefiCpuPkg/CpuIoPei/CpuIoPei.inf
UefiCpuPkg/Library/SecPeiDxeTimerLibUefiCpu/SecPeiDxeTimerLibUefiCpu.inf
UefiCpuPkg/Application/Cpuid/Cpuid.inf
+ UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
+ UefiCpuPkg/Library/CpuTimerLib/DxeCpuTimerLib.inf
+ UefiCpuPkg/Library/CpuTimerLib/PeiCpuTimerLib.inf
[Components.IA32, Components.X64]
UefiCpuPkg/CpuDxe/CpuDxe.inf
diff --git a/UefiCpuPkg/UefiCpuPkg.uni b/UefiCpuPkg/UefiCpuPkg.uni
index 80af4fc1d2..fbf7680726 100644
--- a/UefiCpuPkg/UefiCpuPkg.uni
+++ b/UefiCpuPkg/UefiCpuPkg.uni
@@ -242,3 +242,13 @@
#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuKnownGoodStackSize_HELP #language en-US "Size of good stack for an exception.\n"
"This PCD will only take into effect if PcdCpuStackGuard is enabled.\n"
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuCoreCrystalClockFrequency_PROMPT #language en-US "Specifies CPUID Leaf 0x15 Time Stamp Counter and Nominal Core Crystal Clock Frequency."
+
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuCoreCrystalClockFrequency_HELP #language en-US "Specifies CPUID Leaf 0x15 Time Stamp Counter and Nominal Core Crystal Clock Frequency.<BR><BR>\n"
+ "TSC Frequency = ECX (core crystal clock frequency) * EBX/EAX.<BR><BR>\n"
+ "This PCD is the nominal frequency of the core crystal clock in Hz as is CPUID Leaf 0x15:ECX.<BR><BR>\n"
+ "Default value is 24000000 for 6th and 7th generation Intel Core processors and Intel Xeon W Processor Family.<BR>\n"
+ "25000000 - Intel Xeon Processor Scalable Family with CPUID signature 06_55H(25MHz).<BR>\n"
+ "24000000 - 6th and 7th generation Intel Core processors and Intel Xeon W Processor Family(24MHz).<BR>\n"
+ "19200000 - Intel Atom processors based on Goldmont Microarchitecture with CPUID signature 06_5CH(19.2MHz).<BR>\n"
+
--
2.14.2.windows.3
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^ permalink raw reply related [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-15 4:37 Donald Kuo
@ 2019-08-15 7:20 ` Vitaly Cheptsov
2019-08-15 8:40 ` Donald Kuo
0 siblings, 1 reply; 20+ messages in thread
From: Vitaly Cheptsov @ 2019-08-15 7:20 UTC (permalink / raw)
To: Donald Kuo, devel
[-- Attachment #1: Type: text/plain, Size: 3119 bytes --]
Hello,
Thank you for the patch! I reviewed the code and noticed select issues explained below.
1. The following construction:
if (RegEbx == 0) {
DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
ASSERT (RegEbx != 0);
}
Does not look good to me, and in my opinion, should be written differently:
if (RegEbx == 0 || RegEax == 0 ) {
DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
ASSERT (RegEbx != 0);
ASSERT (RegEax != 0);
return 0;
}
The reason for the above code being wrong is potential division by zero below, which behaviour is undefined (and in fact unknown due to unspecified interrupt table state). Even though the intent is to not permit the use of this library on an unsupported platform, runtime checks and assertions are essentially NO-OPs, should be separate and not confused. For this to work properly the call to CpuidCoreClockCalculateTscFrequency should happen in library constructor with EFI_UNSUPPORTED return on CpuidCoreClockCalculateTscFrequency returning 0.
2. The notes about crystal clock frequency for 06_55H CPU signature:
"25000000 - Intel Xeon Processor Scalable Family with CPUID signature 06_55H(25MHz).<BR>\n"
# Intel Xeon Processor Scalable Family with CPUID signature 06_55H = 25000000 (25MHz)
are misleading in both this library and Intel SDM. Intel Xeon W processors have the same CPUID signature ( 06_55H) , they report 0 crystal clock frequency, and their crystal clock frequency is 24 MHz. This should at least be mentioned in the lower part mentioning Intel Xeon W Processor Family(24MHz).
Actually, given that many Intel guys are here, I wonder whether anybody knows if there is any better approach to distinguish Xeon Scalable CPUs and Xeon W CPUs besides using brand string or using marketing frequency from CPUID 16H to determine crystal clock frequency (this is what Linux does at the moment)?
3. Intel Atom Denverton with CPUID signature (06_5FH), also known as Goldmont X, reports 0 crystal clock frequency as well, and has 25 MHz frequency. This is missing from SDM, but once again I believe it should be included in the two places from the above to avoid confusion.
Besides these 3 points, honestly, the library itself appears to be very limited for anything but embedding it into the firmware with known hardware, which already works just fine by defining the PCD. Missing 0 crystal clock frequency handling in runtime with hardcoding the PCD value looks very bad, because the number of modern Intel CPU models reporting 0 crystal clock frequency and having non 24 MHz frequency is quite far from 0. This makes the library essentially impossible to use in any UEFI application or third-party product even when targeting Skylake+ generation. To resolute this I vote for additional detection functionality to be added to the library to obtain crystal clock frequency when the CPUID reports 0. The PCD could be the last resort when no other method works. My opinion is that this should be resolved prior to merging the patch.
Best regards,
Vitaly
[-- Attachment #2: Type: text/html, Size: 4284 bytes --]
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-15 7:20 ` [edk2-devel] " Vitaly Cheptsov
@ 2019-08-15 8:40 ` Donald Kuo
2019-08-15 12:09 ` Vitaly Cheptsov
0 siblings, 1 reply; 20+ messages in thread
From: Donald Kuo @ 2019-08-15 8:40 UTC (permalink / raw)
To: Vitaly Cheptsov, devel@edk2.groups.io; +Cc: Dong, Eric, Ni, Ray, Gao, Liming
[-- Attachment #1: Type: text/plain, Size: 4758 bytes --]
Hi Vitaly,
Appreciated for reviewing very detail. And looks your captured some piece of code is older version. And should be ok, I do got your point.
Item #1
- I do missed RegEax error handling in case for CpuidCoreClockCalculateTscFrequency () should return 0 and EFI_UNSUPPORTED. AR: Will update it.
Item #2:
- Actually the information is from SDM Table 18-85
o As we know CPUID signature could be hard to identify processor XTAL frequency is? So we only check CPUID Leaf 0x15
o And the PCD will be defined depends on platform specific and during project early development. Based on SDM, Intel processor for CPUID.15h EAX and EBX is enumerated, but ECX could be possible not enumerated. So that is why we based on SDM Table 18-85 to create PCD as below:
§ Intel Xeon Server family: 25MHz
§ Intel Core and Intel Xeon W family: 24MHz
§ Intel Atom : 19.2MHz
§ So regards the “06_55h” might cause the confused, we could review it whether remove it??
Item #3:
- Again, the XTAL frequency is optional and should be define in early phase of new project. Default should still use AcpiTimer.
o Platform / developer owner should well know the CPU generation XTAL frequency is? Server / Client / Atom ?
o For those CPU not supported should still use AcpiTimerLib (default)
Thanks,
Donald
From: vit9696 via [] [mailto:vit9696=protonmail.com@[]]
Sent: Thursday, August 15, 2019 3:20 PM
To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io
Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
Hello,
Thank you for the patch! I reviewed the code and noticed select issues explained below.
1. The following construction:
if (RegEbx == 0) {
DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
ASSERT (RegEbx != 0);
}
Does not look good to me, and in my opinion, should be written differently:
if (RegEbx == 0 || RegEax == 0) {
DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
ASSERT (RegEbx != 0);
ASSERT (RegEax != 0);
return 0;
}
The reason for the above code being wrong is potential division by zero below, which behaviour is undefined (and in fact unknown due to unspecified interrupt table state). Even though the intent is to not permit the use of this library on an unsupported platform, runtime checks and assertions are essentially NO-OPs, should be separate and not confused. For this to work properly the call to CpuidCoreClockCalculateTscFrequency should happen in library constructor with EFI_UNSUPPORTED return on CpuidCoreClockCalculateTscFrequency returning 0.
2. The notes about crystal clock frequency for 06_55H CPU signature:
"25000000 - Intel Xeon Processor Scalable Family with CPUID signature 06_55H(25MHz).<BR>\n"
# Intel Xeon Processor Scalable Family with CPUID signature 06_55H = 25000000 (25MHz)
are misleading in both this library and Intel SDM. Intel Xeon W processors have the same CPUID signature (06_55H), they report 0 crystal clock frequency, and their crystal clock frequency is 24 MHz. This should at least be mentioned in the lower part mentioning Intel Xeon W Processor Family(24MHz).
Actually, given that many Intel guys are here, I wonder whether anybody knows if there is any better approach to distinguish Xeon Scalable CPUs and Xeon W CPUs besides using brand string or using marketing frequency from CPUID 16H to determine crystal clock frequency (this is what Linux does at the moment)?
3. Intel Atom Denverton with CPUID signature (06_5FH), also known as Goldmont X, reports 0 crystal clock frequency as well, and has 25 MHz frequency. This is missing from SDM, but once again I believe it should be included in the two places from the above to avoid confusion.
Besides these 3 points, honestly, the library itself appears to be very limited for anything but embedding it into the firmware with known hardware, which already works just fine by defining the PCD. Missing 0 crystal clock frequency handling in runtime with hardcoding the PCD value looks very bad, because the number of modern Intel CPU models reporting 0 crystal clock frequency and having non 24 MHz frequency is quite far from 0. This makes the library essentially impossible to use in any UEFI application or third-party product even when targeting Skylake+ generation. To resolute this I vote for additional detection functionality to be added to the library to obtain crystal clock frequency when the CPUID reports 0. The PCD could be the last resort when no other method works. My opinion is that this should be resolved prior to merging the patch.
Best regards,
Vitaly
[-- Attachment #2: Type: text/html, Size: 17431 bytes --]
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-15 8:40 ` Donald Kuo
@ 2019-08-15 12:09 ` Vitaly Cheptsov
2019-08-15 16:23 ` Michael D Kinney
0 siblings, 1 reply; 20+ messages in thread
From: Vitaly Cheptsov @ 2019-08-15 12:09 UTC (permalink / raw)
To: donald.kuo; +Cc: devel@edk2.groups.io
[-- Attachment #1.1: Type: text/plain, Size: 6549 bytes --]
Hi Donald,
Glad to hear it helped a little, and sorry for some outdated quotes.
Your clarification regarding model range is very helpful. Xeon W being client and thus having client clock makes sense, though I must say it was quite not obvious. I was referring to the same SDM table, and it would have been great to have vertical range binding instead of the misleading CPUID.
With that, however, I still do not see a way to dynamically determine the difference between Xeon client and server.
For us it is needed as we use TimerLib differently. For you TimerLib is a part of BSP, so you face no issue statically setting the clock frequency as a PCD. For us TimerLib is used as a part of an UEFI application compatible with different hardware, and in fact not just Intel. We have such "generic TimerLib" library, and to determine CPU frequency, as a fallback to CPUID 15H, it relies on ACPI PM timer. This is not great for two reasons:
- we have to maintain it ourselves, while we would have liked that be part of EDK II with different vendors contributing to the project.
- we still cannot find an obvious way to determine crystal clock when it is not reported, in particular for Xeon W and Xeon Scalable case.
I guess this is now out of the scope of this patch and perhaps even this exact library, but it will be helpful to hear relevant technical details on the issue and opinions on such "generic TimerLib" library to later appear in EDK II.
Best regards,
Vitaly
> 15 авг. 2019 г., в 11:40, Kuo, Donald <donald.kuo@intel.com> написал(а):
>
> Hi Vitaly,
>
> Appreciated for reviewing very detail. And looks your captured some piece of code is older version. And should be ok, I do got your point.
>
> Item #1
> - I do missed RegEax error handling in case for CpuidCoreClockCalculateTscFrequency () should return 0 and EFI_UNSUPPORTED. AR: Will update it.
>
> Item #2:
> - Actually the information is from SDM Table 18-85
> o As we know CPUID signature could be hard to identify processor XTAL frequency is? So we only check CPUID Leaf 0x15
> o And the PCD will be defined depends on platform specific and during project early development. Based on SDM, Intel processor for CPUID.15h EAX and EBX is enumerated, but ECX could be possible not enumerated. So that is why we based on SDM Table 18-85 to create PCD as below:
> § Intel Xeon Server family: 25MHz
> § Intel Core and Intel Xeon W family: 24MHz
> § Intel Atom : 19.2MHz
> § So regards the “06_55h” might cause the confused, we could review it whether remove it??
> Item #3:
> - Again, the XTAL frequency is optional and should be define in early phase of new project. Default should still use AcpiTimer.
> o Platform / developer owner should well know the CPU generation XTAL frequency is? Server / Client / Atom ?
> o For those CPU not supported should still use AcpiTimerLib (default)
>
> Thanks,
> Donald
> <>
> <>From: vit9696 via [] [mailto:vit9696=protonmail.com <http://protonmail.com/>@[]]
> Sent: Thursday, August 15, 2019 3:20 PM
> To: Kuo, Donald <donald.kuo@intel.com <mailto:donald.kuo@intel.com>>; devel@edk2.groups.io <mailto:devel@edk2.groups.io>
> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
>
> Hello,
>
> Thank you for the patch! I reviewed the code and noticed select issues explained below.
>
> 1. The following construction:
>
> if (RegEbx == 0) {
> DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
> ASSERT (RegEbx != 0);
> }
>
> Does not look good to me, and in my opinion, should be written differently:
>
> if (RegEbx == 0 || RegEax == 0) {
> DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
> ASSERT (RegEbx != 0);
> ASSERT (RegEax != 0);
> return 0;
> }
>
> The reason for the above code being wrong is potential division by zero below, which behaviour is undefined (and in fact unknown due to unspecified interrupt table state). Even though the intent is to not permit the use of this library on an unsupported platform, runtime checks and assertions are essentially NO-OPs, should be separate and not confused. For this to work properly the call to CpuidCoreClockCalculateTscFrequency should happen in library constructor with EFI_UNSUPPORTED return on CpuidCoreClockCalculateTscFrequency returning 0.
>
> 2. The notes about crystal clock frequency for 06_55H CPU signature:
> "25000000 - Intel Xeon Processor Scalable Family with CPUID signature 06_55H(25MHz).<BR>\n"
> # Intel Xeon Processor Scalable Family with CPUID signature 06_55H = 25000000 (25MHz)
>
> are misleading in both this library and Intel SDM. Intel Xeon W processors have the same CPUID signature (06_55H), they report 0 crystal clock frequency, and their crystal clock frequency is 24 MHz. This should at least be mentioned in the lower part mentioning Intel Xeon W Processor Family(24MHz).
>
> Actually, given that many Intel guys are here, I wonder whether anybody knows if there is any better approach to distinguish Xeon Scalable CPUs and Xeon W CPUs besides using brand string or using marketing frequency from CPUID 16H to determine crystal clock frequency (this is what Linux does at the moment)?
>
> 3. Intel Atom Denverton with CPUID signature (06_5FH), also known as Goldmont X, reports 0 crystal clock frequency as well, and has 25 MHz frequency. This is missing from SDM, but once again I believe it should be included in the two places from the above to avoid confusion.
>
> Besides these 3 points, honestly, the library itself appears to be very limited for anything but embedding it into the firmware with known hardware, which already works just fine by defining the PCD. Missing 0 crystal clock frequency handling in runtime with hardcoding the PCD value looks very bad, because the number of modern Intel CPU models reporting 0 crystal clock frequency and having non 24 MHz frequency is quite far from 0. This makes the library essentially impossible to use in any UEFI application or third-party product even when targeting Skylake+ generation. To resolute this I vote for additional detection functionality to be added to the library to obtain crystal clock frequency when the CPUID reports 0. The PCD could be the last resort when no other method works. My opinion is that this should be resolved prior to merging the patch.
>
> Best regards,
> Vitaly
[-- Attachment #1.2: Type: text/html, Size: 19879 bytes --]
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 489 bytes --]
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-15 12:09 ` Vitaly Cheptsov
@ 2019-08-15 16:23 ` Michael D Kinney
2019-08-16 6:56 ` Donald Kuo
0 siblings, 1 reply; 20+ messages in thread
From: Michael D Kinney @ 2019-08-15 16:23 UTC (permalink / raw)
To: devel@edk2.groups.io, vit9696@protonmail.com, Kuo, Donald,
Kinney, Michael D
[-- Attachment #1: Type: text/plain, Size: 7609 bytes --]
Vitaly,
When implementing a UEFI Application, if you want maximum compatibility, you should use UEFI Services/Protocols and minimize as many HW assumptions as possible.
I understand, especially for accurate time and clock related services, the that the UEFI Specification defined Services/Protocols can be challenging to use.
When adding content that uses HW such as TSC or CPUID the UEFI App should be implemented with good detection logic to know it is safe to use that HW, and contain the fallback logic to use an alternate mechanism if the required HW is not present. This is a very different approach than some early FW initialization code that can safely make some HW assumptions that helps keep the FW init code small and efficient. This does imply that different libraries may be required for FW init and UEFI Applications.
Thanks,
Mike
From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of Vitaly Cheptsov via Groups.Io
Sent: Thursday, August 15, 2019 5:10 AM
To: Kuo, Donald <donald.kuo@intel.com>
Cc: devel@edk2.groups.io
Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
Hi Donald,
Glad to hear it helped a little, and sorry for some outdated quotes.
Your clarification regarding model range is very helpful. Xeon W being client and thus having client clock makes sense, though I must say it was quite not obvious. I was referring to the same SDM table, and it would have been great to have vertical range binding instead of the misleading CPUID.
With that, however, I still do not see a way to dynamically determine the difference between Xeon client and server.
For us it is needed as we use TimerLib differently. For you TimerLib is a part of BSP, so you face no issue statically setting the clock frequency as a PCD. For us TimerLib is used as a part of an UEFI application compatible with different hardware, and in fact not just Intel. We have such "generic TimerLib" library, and to determine CPU frequency, as a fallback to CPUID 15H, it relies on ACPI PM timer. This is not great for two reasons:
- we have to maintain it ourselves, while we would have liked that be part of EDK II with different vendors contributing to the project.
- we still cannot find an obvious way to determine crystal clock when it is not reported, in particular for Xeon W and Xeon Scalable case.
I guess this is now out of the scope of this patch and perhaps even this exact library, but it will be helpful to hear relevant technical details on the issue and opinions on such "generic TimerLib" library to later appear in EDK II.
Best regards,
Vitaly
15 авг. 2019 г., в 11:40, Kuo, Donald <donald.kuo@intel.com<mailto:donald.kuo@intel.com>> написал(а):
Hi Vitaly,
Appreciated for reviewing very detail. And looks your captured some piece of code is older version. And should be ok, I do got your point.
Item #1
- I do missed RegEax error handling in case for CpuidCoreClockCalculateTscFrequency () should return 0 and EFI_UNSUPPORTED. AR: Will update it.
Item #2:
- Actually the information is from SDM Table 18-85
o As we know CPUID signature could be hard to identify processor XTAL frequency is? So we only check CPUID Leaf 0x15
o And the PCD will be defined depends on platform specific and during project early development. Based on SDM, Intel processor for CPUID.15h EAX and EBX is enumerated, but ECX could be possible not enumerated. So that is why we based on SDM Table 18-85 to create PCD as below:
• Intel Xeon Server family: 25MHz
• Intel Core and Intel Xeon W family: 24MHz
• Intel Atom : 19.2MHz
• So regards the “06_55h” might cause the confused, we could review it whether remove it??
Item #3:
- Again, the XTAL frequency is optional and should be define in early phase of new project. Default should still use AcpiTimer.
o Platform / developer owner should well know the CPU generation XTAL frequency is? Server / Client / Atom ?
o For those CPU not supported should still use AcpiTimerLib (default)
Thanks,
Donald
From: vit9696 via [] [mailto:vit9696=protonmail.com<http://protonmail.com/>@[]]
Sent: Thursday, August 15, 2019 3:20 PM
To: Kuo, Donald <donald.kuo@intel.com<mailto:donald.kuo@intel.com>>; devel@edk2.groups.io<mailto:devel@edk2.groups.io>
Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
Hello,
Thank you for the patch! I reviewed the code and noticed select issues explained below.
1. The following construction:
if (RegEbx == 0) {
DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
ASSERT (RegEbx != 0);
}
Does not look good to me, and in my opinion, should be written differently:
if (RegEbx == 0 || RegEax == 0) {
DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
ASSERT (RegEbx != 0);
ASSERT (RegEax != 0);
return 0;
}
The reason for the above code being wrong is potential division by zero below, which behaviour is undefined (and in fact unknown due to unspecified interrupt table state). Even though the intent is to not permit the use of this library on an unsupported platform, runtime checks and assertions are essentially NO-OPs, should be separate and not confused. For this to work properly the call to CpuidCoreClockCalculateTscFrequency should happen in library constructor with EFI_UNSUPPORTED return on CpuidCoreClockCalculateTscFrequency returning 0.
2. The notes about crystal clock frequency for 06_55H CPU signature:
"25000000 - Intel Xeon Processor Scalable Family with CPUID signature 06_55H(25MHz).<BR>\n"
# Intel Xeon Processor Scalable Family with CPUID signature 06_55H = 25000000 (25MHz)
are misleading in both this library and Intel SDM. Intel Xeon W processors have the same CPUID signature (06_55H), they report 0 crystal clock frequency, and their crystal clock frequency is 24 MHz. This should at least be mentioned in the lower part mentioning Intel Xeon W Processor Family(24MHz).
Actually, given that many Intel guys are here, I wonder whether anybody knows if there is any better approach to distinguish Xeon Scalable CPUs and Xeon W CPUs besides using brand string or using marketing frequency from CPUID 16H to determine crystal clock frequency (this is what Linux does at the moment)?
3. Intel Atom Denverton with CPUID signature (06_5FH), also known as Goldmont X, reports 0 crystal clock frequency as well, and has 25 MHz frequency. This is missing from SDM, but once again I believe it should be included in the two places from the above to avoid confusion.
Besides these 3 points, honestly, the library itself appears to be very limited for anything but embedding it into the firmware with known hardware, which already works just fine by defining the PCD. Missing 0 crystal clock frequency handling in runtime with hardcoding the PCD value looks very bad, because the number of modern Intel CPU models reporting 0 crystal clock frequency and having non 24 MHz frequency is quite far from 0. This makes the library essentially impossible to use in any UEFI application or third-party product even when targeting Skylake+ generation. To resolute this I vote for additional detection functionality to be added to the library to obtain crystal clock frequency when the CPUID reports 0. The PCD could be the last resort when no other method works. My opinion is that this should be resolved prior to merging the patch.
Best regards,
Vitaly
[-- Attachment #2: Type: text/html, Size: 60725 bytes --]
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-15 16:23 ` Michael D Kinney
@ 2019-08-16 6:56 ` Donald Kuo
2019-08-16 8:07 ` Vitaly Cheptsov
0 siblings, 1 reply; 20+ messages in thread
From: Donald Kuo @ 2019-08-16 6:56 UTC (permalink / raw)
To: Kinney, Michael D, devel@edk2.groups.io, vit9696@protonmail.com
[-- Attachment #1: Type: text/plain, Size: 8410 bytes --]
Hi Vitaly,
UEFI Application does be another scope. And regards your question on “a way to dynamically determine the difference between Xeon client and server” … is not in current design-in, for long term goal we could consider if there is proper way to identify CPU SKU dynamically.
Thanks for sharing your thought and it could be an enhancement on TimerLib in the future. ☺
Thanks,
Donald
From: Kinney, Michael D
Sent: Friday, August 16, 2019 12:23 AM
To: devel@edk2.groups.io; vit9696@protonmail.com; Kuo, Donald <donald.kuo@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>
Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
Vitaly,
When implementing a UEFI Application, if you want maximum compatibility, you should use UEFI Services/Protocols and minimize as many HW assumptions as possible.
I understand, especially for accurate time and clock related services, the that the UEFI Specification defined Services/Protocols can be challenging to use.
When adding content that uses HW such as TSC or CPUID the UEFI App should be implemented with good detection logic to know it is safe to use that HW, and contain the fallback logic to use an alternate mechanism if the required HW is not present. This is a very different approach than some early FW initialization code that can safely make some HW assumptions that helps keep the FW init code small and efficient. This does imply that different libraries may be required for FW init and UEFI Applications.
Thanks,
Mike
From: devel@edk2.groups.io<mailto:devel@edk2.groups.io> [mailto:devel@edk2.groups.io] On Behalf Of Vitaly Cheptsov via Groups.Io
Sent: Thursday, August 15, 2019 5:10 AM
To: Kuo, Donald <donald.kuo@intel.com<mailto:donald.kuo@intel.com>>
Cc: devel@edk2.groups.io<mailto:devel@edk2.groups.io>
Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
Hi Donald,
Glad to hear it helped a little, and sorry for some outdated quotes.
Your clarification regarding model range is very helpful. Xeon W being client and thus having client clock makes sense, though I must say it was quite not obvious. I was referring to the same SDM table, and it would have been great to have vertical range binding instead of the misleading CPUID.
With that, however, I still do not see a way to dynamically determine the difference between Xeon client and server.
For us it is needed as we use TimerLib differently. For you TimerLib is a part of BSP, so you face no issue statically setting the clock frequency as a PCD. For us TimerLib is used as a part of an UEFI application compatible with different hardware, and in fact not just Intel. We have such "generic TimerLib" library, and to determine CPU frequency, as a fallback to CPUID 15H, it relies on ACPI PM timer. This is not great for two reasons:
- we have to maintain it ourselves, while we would have liked that be part of EDK II with different vendors contributing to the project.
- we still cannot find an obvious way to determine crystal clock when it is not reported, in particular for Xeon W and Xeon Scalable case.
I guess this is now out of the scope of this patch and perhaps even this exact library, but it will be helpful to hear relevant technical details on the issue and opinions on such "generic TimerLib" library to later appear in EDK II.
Best regards,
Vitaly
15 авг. 2019 г., в 11:40, Kuo, Donald <donald.kuo@intel.com<mailto:donald.kuo@intel.com>> написал(а):
Hi Vitaly,
Appreciated for reviewing very detail. And looks your captured some piece of code is older version. And should be ok, I do got your point.
Item #1
- I do missed RegEax error handling in case for CpuidCoreClockCalculateTscFrequency () should return 0 and EFI_UNSUPPORTED. AR: Will update it.
Item #2:
- Actually the information is from SDM Table 18-85
o As we know CPUID signature could be hard to identify processor XTAL frequency is? So we only check CPUID Leaf 0x15
o And the PCD will be defined depends on platform specific and during project early development. Based on SDM, Intel processor for CPUID.15h EAX and EBX is enumerated, but ECX could be possible not enumerated. So that is why we based on SDM Table 18-85 to create PCD as below:
• Intel Xeon Server family: 25MHz
• Intel Core and Intel Xeon W family: 24MHz
• Intel Atom : 19.2MHz
• So regards the “06_55h” might cause the confused, we could review it whether remove it??
Item #3:
- Again, the XTAL frequency is optional and should be define in early phase of new project. Default should still use AcpiTimer.
o Platform / developer owner should well know the CPU generation XTAL frequency is? Server / Client / Atom ?
o For those CPU not supported should still use AcpiTimerLib (default)
Thanks,
Donald
From: vit9696 via [] [mailto:vit9696=protonmail.com<http://protonmail.com/>@[]]
Sent: Thursday, August 15, 2019 3:20 PM
To: Kuo, Donald <donald.kuo@intel.com<mailto:donald.kuo@intel.com>>; devel@edk2.groups.io<mailto:devel@edk2.groups.io>
Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
Hello,
Thank you for the patch! I reviewed the code and noticed select issues explained below.
1. The following construction:
if (RegEbx == 0) {
DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
ASSERT (RegEbx != 0);
}
Does not look good to me, and in my opinion, should be written differently:
if (RegEbx == 0 || RegEax == 0) {
DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
ASSERT (RegEbx != 0);
ASSERT (RegEax != 0);
return 0;
}
The reason for the above code being wrong is potential division by zero below, which behaviour is undefined (and in fact unknown due to unspecified interrupt table state). Even though the intent is to not permit the use of this library on an unsupported platform, runtime checks and assertions are essentially NO-OPs, should be separate and not confused. For this to work properly the call to CpuidCoreClockCalculateTscFrequency should happen in library constructor with EFI_UNSUPPORTED return on CpuidCoreClockCalculateTscFrequency returning 0.
2. The notes about crystal clock frequency for 06_55H CPU signature:
"25000000 - Intel Xeon Processor Scalable Family with CPUID signature 06_55H(25MHz).<BR>\n"
# Intel Xeon Processor Scalable Family with CPUID signature 06_55H = 25000000 (25MHz)
are misleading in both this library and Intel SDM. Intel Xeon W processors have the same CPUID signature (06_55H), they report 0 crystal clock frequency, and their crystal clock frequency is 24 MHz. This should at least be mentioned in the lower part mentioning Intel Xeon W Processor Family(24MHz).
Actually, given that many Intel guys are here, I wonder whether anybody knows if there is any better approach to distinguish Xeon Scalable CPUs and Xeon W CPUs besides using brand string or using marketing frequency from CPUID 16H to determine crystal clock frequency (this is what Linux does at the moment)?
3. Intel Atom Denverton with CPUID signature (06_5FH), also known as Goldmont X, reports 0 crystal clock frequency as well, and has 25 MHz frequency. This is missing from SDM, but once again I believe it should be included in the two places from the above to avoid confusion.
Besides these 3 points, honestly, the library itself appears to be very limited for anything but embedding it into the firmware with known hardware, which already works just fine by defining the PCD. Missing 0 crystal clock frequency handling in runtime with hardcoding the PCD value looks very bad, because the number of modern Intel CPU models reporting 0 crystal clock frequency and having non 24 MHz frequency is quite far from 0. This makes the library essentially impossible to use in any UEFI application or third-party product even when targeting Skylake+ generation. To resolute this I vote for additional detection functionality to be added to the library to obtain crystal clock frequency when the CPUID reports 0. The PCD could be the last resort when no other method works. My opinion is that this should be resolved prior to merging the patch.
Best regards,
Vitaly
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^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-16 6:56 ` Donald Kuo
@ 2019-08-16 8:07 ` Vitaly Cheptsov
0 siblings, 0 replies; 20+ messages in thread
From: Vitaly Cheptsov @ 2019-08-16 8:07 UTC (permalink / raw)
To: donald.kuo; +Cc: devel@edk2.groups.io
[-- Attachment #1.1: Type: text/plain, Size: 9280 bytes --]
Donald, Michael,
Yes, I see that such a use is quite new and unexpected very well by know. I expanded my thoughts in a separate e-mail thread[1] as the consideration opened up an apparently separate problem partially related to the patch. Perhaps, we could continue the discussion there some time later.
Best regards,
Vitaly
[1] Determining TSC frequency programmatically
https://edk2.groups.io/g/devel/topic/determining_tsc_frequency/32891598?p=,,,100,0,0,0::recentpostdate%2Fsticky,,,100,2,0,32891598
> 16 авг. 2019 г., в 9:56, Kuo, Donald <donald.kuo@intel.com> написал(а):
>
> Hi Vitaly,
>
> UEFI Application does be another scope. And regards your question on “a way to dynamically determine the difference between Xeon client and server” … is not in current design-in, for long term goal we could consider if there is proper way to identify CPU SKU dynamically.
>
> Thanks for sharing your thought and it could be an enhancement on TimerLib in the future. J
>
> Thanks,
> Donald
> <>
> <>From: Kinney, Michael D
> Sent: Friday, August 16, 2019 12:23 AM
> To: devel@edk2.groups.io; vit9696@protonmail.com; Kuo, Donald <donald.kuo@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
>
> Vitaly,
>
> When implementing a UEFI Application, if you want maximum compatibility, you should use UEFI Services/Protocols and minimize as many HW assumptions as possible.
>
> I understand, especially for accurate time and clock related services, the that the UEFI Specification defined Services/Protocols can be challenging to use.
>
> When adding content that uses HW such as TSC or CPUID the UEFI App should be implemented with good detection logic to know it is safe to use that HW, and contain the fallback logic to use an alternate mechanism if the required HW is not present. This is a very different approach than some early FW initialization code that can safely make some HW assumptions that helps keep the FW init code small and efficient. This does imply that different libraries may be required for FW init and UEFI Applications.
>
> Thanks,
>
> Mike
>
> From: devel@edk2.groups.io <mailto:devel@edk2.groups.io> [mailto:devel@edk2.groups.io <mailto:devel@edk2.groups.io>] On Behalf Of Vitaly Cheptsov via Groups.Io
> Sent: Thursday, August 15, 2019 5:10 AM
> To: Kuo, Donald <donald.kuo@intel.com <mailto:donald.kuo@intel.com>>
> Cc: devel@edk2.groups.io <mailto:devel@edk2.groups.io>
> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
>
> Hi Donald,
>
> Glad to hear it helped a little, and sorry for some outdated quotes.
>
> Your clarification regarding model range is very helpful. Xeon W being client and thus having client clock makes sense, though I must say it was quite not obvious. I was referring to the same SDM table, and it would have been great to have vertical range binding instead of the misleading CPUID.
>
> With that, however, I still do not see a way to dynamically determine the difference between Xeon client and server.
>
> For us it is needed as we use TimerLib differently. For you TimerLib is a part of BSP, so you face no issue statically setting the clock frequency as a PCD. For us TimerLib is used as a part of an UEFI application compatible with different hardware, and in fact not just Intel. We have such "generic TimerLib" library, and to determine CPU frequency, as a fallback to CPUID 15H, it relies on ACPI PM timer. This is not great for two reasons:
> - we have to maintain it ourselves, while we would have liked that be part of EDK II with different vendors contributing to the project.
> - we still cannot find an obvious way to determine crystal clock when it is not reported, in particular for Xeon W and Xeon Scalable case.
>
> I guess this is now out of the scope of this patch and perhaps even this exact library, but it will be helpful to hear relevant technical details on the issue and opinions on such "generic TimerLib" library to later appear in EDK II.
>
> Best regards,
> Vitaly
>
> 15 авг. 2019 г., в 11:40, Kuo, Donald <donald.kuo@intel.com <mailto:donald.kuo@intel.com>> написал(а):
>
> Hi Vitaly,
>
> Appreciated for reviewing very detail. And looks your captured some piece of code is older version. And should be ok, I do got your point.
>
> Item #1
> - I do missed RegEax error handling in case for CpuidCoreClockCalculateTscFrequency () should return 0 and EFI_UNSUPPORTED. AR: Will update it.
>
> Item #2:
> - Actually the information is from SDM Table 18-85
> o As we know CPUID signature could be hard to identify processor XTAL frequency is? So we only check CPUID Leaf 0x15
> o And the PCD will be defined depends on platform specific and during project early development. Based on SDM, Intel processor for CPUID.15h EAX and EBX is enumerated, but ECX could be possible not enumerated. So that is why we based on SDM Table 18-85 to create PCD as below:
> § Intel Xeon Server family: 25MHz
> § Intel Core and Intel Xeon W family: 24MHz
> § Intel Atom : 19.2MHz
> § So regards the “06_55h” might cause the confused, we could review it whether remove it??
> Item #3:
> - Again, the XTAL frequency is optional and should be define in early phase of new project. Default should still use AcpiTimer.
> o Platform / developer owner should well know the CPU generation XTAL frequency is? Server / Client / Atom ?
> o For those CPU not supported should still use AcpiTimerLib (default)
>
> Thanks,
> Donald
>
> From: vit9696 via [] [mailto:vit9696=protonmail.com <http://protonmail.com/>@[]]
> Sent: Thursday, August 15, 2019 3:20 PM
> To: Kuo, Donald <donald.kuo@intel.com <mailto:donald.kuo@intel.com>>; devel@edk2.groups.io <mailto:devel@edk2.groups.io>
> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
>
> Hello,
>
> Thank you for the patch! I reviewed the code and noticed select issues explained below.
>
> 1. The following construction:
>
> if (RegEbx == 0) {
> DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
> ASSERT (RegEbx != 0);
> }
>
> Does not look good to me, and in my opinion, should be written differently:
>
> if (RegEbx == 0 || RegEax == 0) {
> DEBUG ((DEBUG_ERROR, "The CPU is not capble for Core Crystal Clock Frequency !!\n"));
> ASSERT (RegEbx != 0);
> ASSERT (RegEax != 0);
> return 0;
> }
>
> The reason for the above code being wrong is potential division by zero below, which behaviour is undefined (and in fact unknown due to unspecified interrupt table state). Even though the intent is to not permit the use of this library on an unsupported platform, runtime checks and assertions are essentially NO-OPs, should be separate and not confused. For this to work properly the call to CpuidCoreClockCalculateTscFrequency should happen in library constructor with EFI_UNSUPPORTED return on CpuidCoreClockCalculateTscFrequency returning 0.
>
> 2. The notes about crystal clock frequency for 06_55H CPU signature:
> "25000000 - Intel Xeon Processor Scalable Family with CPUID signature 06_55H(25MHz).<BR>\n"
> # Intel Xeon Processor Scalable Family with CPUID signature 06_55H = 25000000 (25MHz)
>
> are misleading in both this library and Intel SDM. Intel Xeon W processors have the same CPUID signature (06_55H), they report 0 crystal clock frequency, and their crystal clock frequency is 24 MHz. This should at least be mentioned in the lower part mentioning Intel Xeon W Processor Family(24MHz).
>
> Actually, given that many Intel guys are here, I wonder whether anybody knows if there is any better approach to distinguish Xeon Scalable CPUs and Xeon W CPUs besides using brand string or using marketing frequency from CPUID 16H to determine crystal clock frequency (this is what Linux does at the moment)?
>
> 3. Intel Atom Denverton with CPUID signature (06_5FH), also known as Goldmont X, reports 0 crystal clock frequency as well, and has 25 MHz frequency. This is missing from SDM, but once again I believe it should be included in the two places from the above to avoid confusion.
>
> Besides these 3 points, honestly, the library itself appears to be very limited for anything but embedding it into the firmware with known hardware, which already works just fine by defining the PCD. Missing 0 crystal clock frequency handling in runtime with hardcoding the PCD value looks very bad, because the number of modern Intel CPU models reporting 0 crystal clock frequency and having non 24 MHz frequency is quite far from 0. This makes the library essentially impossible to use in any UEFI application or third-party product even when targeting Skylake+ generation. To resolute this I vote for additional detection functionality to be added to the library to obtain crystal clock frequency when the CPUID reports 0. The PCD could be the last resort when no other method works. My opinion is that this should be resolved prior to merging the patch.
>
> Best regards,
> Vitaly
>
>
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^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-15 4:02 ` Liming Gao
2019-08-15 4:40 ` Donald Kuo
@ 2019-08-16 16:16 ` Laszlo Ersek
2019-08-16 20:40 ` Laszlo Ersek
1 sibling, 1 reply; 20+ messages in thread
From: Laszlo Ersek @ 2019-08-16 16:16 UTC (permalink / raw)
To: Gao, Liming, Kuo, Donald, Dong, Eric, devel@edk2.groups.io
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V, Lai, Luke,
Li, Kevin Y, leif.lindholm@linaro.org, afish@apple.com,
Kinney, Michael D
On 08/15/19 06:02, Gao, Liming wrote:
> Donald: This change is a new feature. Now, it is not in edk2 feature
> planning list. If you want to catch it into 201908 stable tag, please
> get approve from Stewards first. I have cc this mail to all Stewards.
- I don't mind adding a new feature, as long as it gets properly
reviewed by package owners before we enter the soft feature freeze.
- Looking at the BZ
<https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a bit more
documentation would be nice.
- On the negative side, I'm very much *not* a fan of adding features to
the open source edk2 tree without actually *consuming* the feature in an
open source tree. Are the new library instances going to be put to use
in edk2-platforms, perhaps?
We discussed this topic earlier on some of the stewards' calls. On one
hand, it's not uncommon to see library instances from Intel enter core
edk2 packages without any dependent platform code, or even a detailed
problem statement / purpose description (see e.g. commit 5c9bb86f171c
and its surrounding commits). On the other hand, attempts in the past,
to add libraries with well demonstrated and direct in-tree use cases, to
edk2 core, have been rejected, from other submitters. (Here's one
example: <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.) I'm not
prying at proprietary platform information, but a new library added to
edk2 core *should* be well-justified.
The commit message on this patch is empty. It only references
<https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I open the
BZ, this is all I get:
Need a new TSC library to check the CPUID leaf (EAX=0x15) for TSC.
For new platform (start from SKL) can use CPUID and retire/remove
the current override from AcpiTimerLib.
Does this read like an actual feature request? (TimerLib is an MdePkg
library class, so not exactly "niche".)
Plus, the BZ isn't even marked as a feature request, to begin with (the
Product field is wrong, it says "EDK2", which is for bugs, not
features). Also, the patch is on the list, and the status is still
CONFIRMED, and not IN_PROGRESS.
Why are we making a joke of bug tracking? The purpose of a public
bugzilla instance on the web is not just more red tape, not just to have
one more administrative tool that we can abuse, ignore, and write off
with make-believe actions.
It's not like another issue tracker system (JIRA, Launchpad, GitHub,
GitLab, you name it) would properly work with this level of neglect, either.
In summary: I don't mind the feature, but the documentation around it
should be *much* better.
Thanks
Laszlo
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-16 16:16 ` Laszlo Ersek
@ 2019-08-16 20:40 ` Laszlo Ersek
2019-08-20 2:43 ` Donald Kuo
0 siblings, 1 reply; 20+ messages in thread
From: Laszlo Ersek @ 2019-08-16 20:40 UTC (permalink / raw)
To: Gao, Liming, Kuo, Donald, Dong, Eric, devel@edk2.groups.io
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V, Lai, Luke,
Li, Kevin Y, leif.lindholm@linaro.org, afish@apple.com,
Kinney, Michael D
On 08/16/19 18:16, Laszlo Ersek wrote:
> On 08/15/19 06:02, Gao, Liming wrote:
>> Donald: This change is a new feature. Now, it is not in edk2 feature
>> planning list. If you want to catch it into 201908 stable tag, please
>> get approve from Stewards first. I have cc this mail to all Stewards.
> - I don't mind adding a new feature, as long as it gets properly
> reviewed by package owners before we enter the soft feature freeze.
>
> - Looking at the BZ
> <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a bit more
> documentation would be nice.
>
> - On the negative side, I'm very much *not* a fan of adding features to
> the open source edk2 tree without actually *consuming* the feature in an
> open source tree. Are the new library instances going to be put to use
> in edk2-platforms, perhaps?
>
> We discussed this topic earlier on some of the stewards' calls. On one
> hand, it's not uncommon to see library instances from Intel enter core
> edk2 packages without any dependent platform code, or even a detailed
> problem statement / purpose description (see e.g. commit 5c9bb86f171c
> and its surrounding commits). On the other hand, attempts in the past,
> to add libraries with well demonstrated and direct in-tree use cases, to
> edk2 core, have been rejected, from other submitters. (Here's one
> example: <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.) I'm not
> prying at proprietary platform information, but a new library added to
> edk2 core *should* be well-justified.
>
> The commit message on this patch is empty. It only references
> <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I open the
> BZ, this is all I get:
>
> Need a new TSC library to check the CPUID leaf (EAX=0x15) for TSC.
> For new platform (start from SKL) can use CPUID and retire/remove
> the current override from AcpiTimerLib.
>
> Does this read like an actual feature request? (TimerLib is an MdePkg
> library class, so not exactly "niche".)
In comparison, the following email does read like a feature request:
[edk2-devel] Determining TSC frequency programmatically
https://edk2.groups.io/g/devel/message/45750
http://mid.mail-archive.com/8EC14D0D-DFA5-412D-A4E1-4D641576D58E@protonmail.com
If the posting is related to TianoCore#1909, then I urge the BZ assignee to please reference the message in the TianoCore BZ.
Thanks
Laszlo
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-16 20:40 ` Laszlo Ersek
@ 2019-08-20 2:43 ` Donald Kuo
2019-08-20 6:51 ` Liming Gao
0 siblings, 1 reply; 20+ messages in thread
From: Donald Kuo @ 2019-08-20 2:43 UTC (permalink / raw)
To: devel@edk2.groups.io, lersek@redhat.com, Gao, Liming, Dong, Eric
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V, Lai, Luke,
Li, Kevin Y, leif.lindholm@linaro.org, afish@apple.com,
Kinney, Michael D
Thanks Laszlo help to review and great feedbacks. That we did miss to fulfil BZ.
I had updated Bugzilla https://bugzilla.tianocore.org/show_bug.cgi?id=1909 for more documentation.
As I know for the edk2-platforms should be consumed as KBL (7th Generation) platform in Client, and this feature based on SDM is supported on SKL (6th Generation, Family 06h) onwards. So it's ok to use as TimerLib instances for edk2-platforms.
And I think the library is new instances for TimerLib for supported CPU, and those non-supported CPU will still keep using AcpiTimerlib as TimerLib instances.
Thanks,
Donald
> -----Original Message-----
> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
> Laszlo Ersek
> Sent: Saturday, August 17, 2019 4:40 AM
> To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald
> <donald.kuo@intel.com>; Dong, Eric <eric.dong@intel.com>;
> devel@edk2.groups.io
> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan,
> Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin
> Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org; afish@apple.com; Kinney,
> Michael D <michael.d.kinney@intel.com>
> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> using CPUID(0x15) TSC leaf
>
> On 08/16/19 18:16, Laszlo Ersek wrote:
> > On 08/15/19 06:02, Gao, Liming wrote:
> >> Donald: This change is a new feature. Now, it is not in edk2 feature
> >> planning list. If you want to catch it into 201908 stable tag, please
> >> get approve from Stewards first. I have cc this mail to all Stewards.
> > - I don't mind adding a new feature, as long as it gets properly
> > reviewed by package owners before we enter the soft feature freeze.
> >
> > - Looking at the BZ
> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a bit more
> > documentation would be nice.
> >
> > - On the negative side, I'm very much *not* a fan of adding features
> > to the open source edk2 tree without actually *consuming* the feature
> > in an open source tree. Are the new library instances going to be put
> > to use in edk2-platforms, perhaps?
> >
> > We discussed this topic earlier on some of the stewards' calls. On one
> > hand, it's not uncommon to see library instances from Intel enter core
> > edk2 packages without any dependent platform code, or even a detailed
> > problem statement / purpose description (see e.g. commit 5c9bb86f171c
> > and its surrounding commits). On the other hand, attempts in the past,
> > to add libraries with well demonstrated and direct in-tree use cases,
> > to
> > edk2 core, have been rejected, from other submitters. (Here's one
> > example: <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.) I'm
> > not prying at proprietary platform information, but a new library
> > added to
> > edk2 core *should* be well-justified.
> >
> > The commit message on this patch is empty. It only references
> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I open
> > the BZ, this is all I get:
> >
> > Need a new TSC library to check the CPUID leaf (EAX=0x15) for TSC.
> > For new platform (start from SKL) can use CPUID and retire/remove
> > the current override from AcpiTimerLib.
> >
> > Does this read like an actual feature request? (TimerLib is an MdePkg
> > library class, so not exactly "niche".)
>
> In comparison, the following email does read like a feature request:
>
> [edk2-devel] Determining TSC frequency programmatically
> https://edk2.groups.io/g/devel/message/45750
> http://mid.mail-archive.com/8EC14D0D-DFA5-412D-A4E1-
> 4D641576D58E@protonmail.com
>
> If the posting is related to TianoCore#1909, then I urge the BZ assignee to
> please reference the message in the TianoCore BZ.
>
> Thanks
> Laszlo
>
>
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-20 2:43 ` Donald Kuo
@ 2019-08-20 6:51 ` Liming Gao
2019-08-20 7:21 ` Donald Kuo
0 siblings, 1 reply; 20+ messages in thread
From: Liming Gao @ 2019-08-20 6:51 UTC (permalink / raw)
To: Kuo, Donald, devel@edk2.groups.io, lersek@redhat.com, Dong, Eric
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V, Lai, Luke,
Li, Kevin Y, leif.lindholm@linaro.org, afish@apple.com,
Kinney, Michael D
Donald:
Please also attach the patch linker in BZs.
And, please submit another BZ for edk2-platforms\Platform\Intel\KabylakeOpenBoardPkg to apply this new library instance.
Thanks
Liming
>-----Original Message-----
>From: Kuo, Donald
>Sent: Tuesday, August 20, 2019 10:44 AM
>To: devel@edk2.groups.io; lersek@redhat.com; Gao, Liming
><liming.gao@intel.com>; Dong, Eric <eric.dong@intel.com>
>Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan, Amy
><amy.chan@intel.com>; Chaganty, Rangasai V
><rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin Y
><kevin.y.li@intel.com>; leif.lindholm@linaro.org; afish@apple.com; Kinney,
>Michael D <michael.d.kinney@intel.com>
>Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
>using CPUID(0x15) TSC leaf
>
>Thanks Laszlo help to review and great feedbacks. That we did miss to fulfil BZ.
>
>I had updated Bugzilla https://bugzilla.tianocore.org/show_bug.cgi?id=1909
>for more documentation.
>
>As I know for the edk2-platforms should be consumed as KBL (7th Generation)
>platform in Client, and this feature based on SDM is supported on SKL (6th
>Generation, Family 06h) onwards. So it's ok to use as TimerLib instances for
>edk2-platforms.
>
>And I think the library is new instances for TimerLib for supported CPU, and
>those non-supported CPU will still keep using AcpiTimerlib as TimerLib
>instances.
>
>Thanks,
>Donald
>
>> -----Original Message-----
>> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
>> Laszlo Ersek
>> Sent: Saturday, August 17, 2019 4:40 AM
>> To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald
>> <donald.kuo@intel.com>; Dong, Eric <eric.dong@intel.com>;
>> devel@edk2.groups.io
>> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan,
>> Amy <amy.chan@intel.com>; Chaganty, Rangasai V
>> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin
>> Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org; afish@apple.com;
>Kinney,
>> Michael D <michael.d.kinney@intel.com>
>> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
>> using CPUID(0x15) TSC leaf
>>
>> On 08/16/19 18:16, Laszlo Ersek wrote:
>> > On 08/15/19 06:02, Gao, Liming wrote:
>> >> Donald: This change is a new feature. Now, it is not in edk2 feature
>> >> planning list. If you want to catch it into 201908 stable tag, please
>> >> get approve from Stewards first. I have cc this mail to all Stewards.
>> > - I don't mind adding a new feature, as long as it gets properly
>> > reviewed by package owners before we enter the soft feature freeze.
>> >
>> > - Looking at the BZ
>> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a bit more
>> > documentation would be nice.
>> >
>> > - On the negative side, I'm very much *not* a fan of adding features
>> > to the open source edk2 tree without actually *consuming* the feature
>> > in an open source tree. Are the new library instances going to be put
>> > to use in edk2-platforms, perhaps?
>> >
>> > We discussed this topic earlier on some of the stewards' calls. On one
>> > hand, it's not uncommon to see library instances from Intel enter core
>> > edk2 packages without any dependent platform code, or even a detailed
>> > problem statement / purpose description (see e.g. commit 5c9bb86f171c
>> > and its surrounding commits). On the other hand, attempts in the past,
>> > to add libraries with well demonstrated and direct in-tree use cases,
>> > to
>> > edk2 core, have been rejected, from other submitters. (Here's one
>> > example: <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.) I'm
>> > not prying at proprietary platform information, but a new library
>> > added to
>> > edk2 core *should* be well-justified.
>> >
>> > The commit message on this patch is empty. It only references
>> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I open
>> > the BZ, this is all I get:
>> >
>> > Need a new TSC library to check the CPUID leaf (EAX=0x15) for TSC.
>> > For new platform (start from SKL) can use CPUID and retire/remove
>> > the current override from AcpiTimerLib.
>> >
>> > Does this read like an actual feature request? (TimerLib is an MdePkg
>> > library class, so not exactly "niche".)
>>
>> In comparison, the following email does read like a feature request:
>>
>> [edk2-devel] Determining TSC frequency programmatically
>> https://edk2.groups.io/g/devel/message/45750
>> http://mid.mail-archive.com/8EC14D0D-DFA5-412D-A4E1-
>> 4D641576D58E@protonmail.com
>>
>> If the posting is related to TianoCore#1909, then I urge the BZ assignee to
>> please reference the message in the TianoCore BZ.
>>
>> Thanks
>> Laszlo
>>
>>
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-20 6:51 ` Liming Gao
@ 2019-08-20 7:21 ` Donald Kuo
2019-08-20 11:56 ` Liming Gao
0 siblings, 1 reply; 20+ messages in thread
From: Donald Kuo @ 2019-08-20 7:21 UTC (permalink / raw)
To: Gao, Liming, devel@edk2.groups.io, lersek@redhat.com, Dong, Eric
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V, Lai, Luke,
Li, Kevin Y, leif.lindholm@linaro.org, afish@apple.com,
Kinney, Michael D
Hi Liming,
Done.
Patch is attached to https://bugzilla.tianocore.org/show_bug.cgi?id=1909
Another BZ to apply CpuTimerLib will be tracking on: https://bugzilla.tianocore.org/show_bug.cgi?id=2096
Thanks,
Donald
> -----Original Message-----
> From: Gao, Liming
> Sent: Tuesday, August 20, 2019 2:51 PM
> To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan,
> Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin
> Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org; afish@apple.com; Kinney,
> Michael D <michael.d.kinney@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> using CPUID(0x15) TSC leaf
>
> Donald:
> Please also attach the patch linker in BZs.
>
> And, please submit another BZ for edk2-
> platforms\Platform\Intel\KabylakeOpenBoardPkg to apply this new library
> instance.
>
> Thanks
> Liming
> >-----Original Message-----
> >From: Kuo, Donald
> >Sent: Tuesday, August 20, 2019 10:44 AM
> >To: devel@edk2.groups.io; lersek@redhat.com; Gao, Liming
> ><liming.gao@intel.com>; Dong, Eric <eric.dong@intel.com>
> >Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan,
> >Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> ><rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> >Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> >afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> >Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library
> >by using CPUID(0x15) TSC leaf
> >
> >Thanks Laszlo help to review and great feedbacks. That we did miss to fulfil
> BZ.
> >
> >I had updated Bugzilla
> >https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> >for more documentation.
> >
> >As I know for the edk2-platforms should be consumed as KBL (7th
> >Generation) platform in Client, and this feature based on SDM is
> >supported on SKL (6th Generation, Family 06h) onwards. So it's ok to
> >use as TimerLib instances for edk2-platforms.
> >
> >And I think the library is new instances for TimerLib for supported
> >CPU, and those non-supported CPU will still keep using AcpiTimerlib as
> >TimerLib instances.
> >
> >Thanks,
> >Donald
> >
> >> -----Original Message-----
> >> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
> >> Laszlo Ersek
> >> Sent: Saturday, August 17, 2019 4:40 AM
> >> To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald
> >> <donald.kuo@intel.com>; Dong, Eric <eric.dong@intel.com>;
> >> devel@edk2.groups.io
> >> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> >> Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> >> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> >> Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> >> afish@apple.com;
> >Kinney,
> >> Michael D <michael.d.kinney@intel.com>
> >> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> >> library by using CPUID(0x15) TSC leaf
> >>
> >> On 08/16/19 18:16, Laszlo Ersek wrote:
> >> > On 08/15/19 06:02, Gao, Liming wrote:
> >> >> Donald: This change is a new feature. Now, it is not in edk2
> >> >> feature planning list. If you want to catch it into 201908 stable
> >> >> tag, please get approve from Stewards first. I have cc this mail to all
> Stewards.
> >> > - I don't mind adding a new feature, as long as it gets properly
> >> > reviewed by package owners before we enter the soft feature freeze.
> >> >
> >> > - Looking at the BZ
> >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a bit more
> >> > documentation would be nice.
> >> >
> >> > - On the negative side, I'm very much *not* a fan of adding
> >> > features to the open source edk2 tree without actually *consuming*
> >> > the feature in an open source tree. Are the new library instances
> >> > going to be put to use in edk2-platforms, perhaps?
> >> >
> >> > We discussed this topic earlier on some of the stewards' calls. On
> >> > one hand, it's not uncommon to see library instances from Intel
> >> > enter core
> >> > edk2 packages without any dependent platform code, or even a
> >> > detailed problem statement / purpose description (see e.g. commit
> >> > 5c9bb86f171c and its surrounding commits). On the other hand,
> >> > attempts in the past, to add libraries with well demonstrated and
> >> > direct in-tree use cases, to
> >> > edk2 core, have been rejected, from other submitters. (Here's one
> >> > example: <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.) I'm
> >> > not prying at proprietary platform information, but a new library
> >> > added to
> >> > edk2 core *should* be well-justified.
> >> >
> >> > The commit message on this patch is empty. It only references
> >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I
> >> > open the BZ, this is all I get:
> >> >
> >> > Need a new TSC library to check the CPUID leaf (EAX=0x15) for TSC.
> >> > For new platform (start from SKL) can use CPUID and retire/remove
> >> > the current override from AcpiTimerLib.
> >> >
> >> > Does this read like an actual feature request? (TimerLib is an
> >> > MdePkg library class, so not exactly "niche".)
> >>
> >> In comparison, the following email does read like a feature request:
> >>
> >> [edk2-devel] Determining TSC frequency programmatically
> >> https://edk2.groups.io/g/devel/message/45750
> >> http://mid.mail-archive.com/8EC14D0D-DFA5-412D-A4E1-
> >> 4D641576D58E@protonmail.com
> >>
> >> If the posting is related to TianoCore#1909, then I urge the BZ
> >> assignee to please reference the message in the TianoCore BZ.
> >>
> >> Thanks
> >> Laszlo
> >>
> >>
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-20 7:21 ` Donald Kuo
@ 2019-08-20 11:56 ` Liming Gao
2019-08-20 14:00 ` Zeng, Star
0 siblings, 1 reply; 20+ messages in thread
From: Liming Gao @ 2019-08-20 11:56 UTC (permalink / raw)
To: Kuo, Donald, devel@edk2.groups.io, lersek@redhat.com, Dong, Eric
Cc: Ni, Ray, Zeng, Star, Chan, Amy, Chaganty, Rangasai V, Lai, Luke,
Li, Kevin Y, leif.lindholm@linaro.org, afish@apple.com,
Kinney, Michael D
Donald:
Thanks for your update. If no other comment, I will help push this patch tomorrow.
Thanks
Liming
> -----Original Message-----
> From: Kuo, Donald
> Sent: Tuesday, August 20, 2019 3:22 PM
> To: Gao, Liming <liming.gao@intel.com>; devel@edk2.groups.io; lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
>
> Hi Liming,
>
> Done.
>
> Patch is attached to https://bugzilla.tianocore.org/show_bug.cgi?id=1909
>
> Another BZ to apply CpuTimerLib will be tracking on: https://bugzilla.tianocore.org/show_bug.cgi?id=2096
>
> Thanks,
> Donald
>
> > -----Original Message-----
> > From: Gao, Liming
> > Sent: Tuesday, August 20, 2019 2:51 PM
> > To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan,
> > Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin
> > Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org; afish@apple.com; Kinney,
> > Michael D <michael.d.kinney@intel.com>
> > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> > using CPUID(0x15) TSC leaf
> >
> > Donald:
> > Please also attach the patch linker in BZs.
> >
> > And, please submit another BZ for edk2-
> > platforms\Platform\Intel\KabylakeOpenBoardPkg to apply this new library
> > instance.
> >
> > Thanks
> > Liming
> > >-----Original Message-----
> > >From: Kuo, Donald
> > >Sent: Tuesday, August 20, 2019 10:44 AM
> > >To: devel@edk2.groups.io; lersek@redhat.com; Gao, Liming
> > ><liming.gao@intel.com>; Dong, Eric <eric.dong@intel.com>
> > >Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan,
> > >Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > ><rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > >Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > >afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > >Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library
> > >by using CPUID(0x15) TSC leaf
> > >
> > >Thanks Laszlo help to review and great feedbacks. That we did miss to fulfil
> > BZ.
> > >
> > >I had updated Bugzilla
> > >https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> > >for more documentation.
> > >
> > >As I know for the edk2-platforms should be consumed as KBL (7th
> > >Generation) platform in Client, and this feature based on SDM is
> > >supported on SKL (6th Generation, Family 06h) onwards. So it's ok to
> > >use as TimerLib instances for edk2-platforms.
> > >
> > >And I think the library is new instances for TimerLib for supported
> > >CPU, and those non-supported CPU will still keep using AcpiTimerlib as
> > >TimerLib instances.
> > >
> > >Thanks,
> > >Donald
> > >
> > >> -----Original Message-----
> > >> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
> > >> Laszlo Ersek
> > >> Sent: Saturday, August 17, 2019 4:40 AM
> > >> To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald
> > >> <donald.kuo@intel.com>; Dong, Eric <eric.dong@intel.com>;
> > >> devel@edk2.groups.io
> > >> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > >> Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > >> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > >> Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > >> afish@apple.com;
> > >Kinney,
> > >> Michael D <michael.d.kinney@intel.com>
> > >> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > >> library by using CPUID(0x15) TSC leaf
> > >>
> > >> On 08/16/19 18:16, Laszlo Ersek wrote:
> > >> > On 08/15/19 06:02, Gao, Liming wrote:
> > >> >> Donald: This change is a new feature. Now, it is not in edk2
> > >> >> feature planning list. If you want to catch it into 201908 stable
> > >> >> tag, please get approve from Stewards first. I have cc this mail to all
> > Stewards.
> > >> > - I don't mind adding a new feature, as long as it gets properly
> > >> > reviewed by package owners before we enter the soft feature freeze.
> > >> >
> > >> > - Looking at the BZ
> > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a bit more
> > >> > documentation would be nice.
> > >> >
> > >> > - On the negative side, I'm very much *not* a fan of adding
> > >> > features to the open source edk2 tree without actually *consuming*
> > >> > the feature in an open source tree. Are the new library instances
> > >> > going to be put to use in edk2-platforms, perhaps?
> > >> >
> > >> > We discussed this topic earlier on some of the stewards' calls. On
> > >> > one hand, it's not uncommon to see library instances from Intel
> > >> > enter core
> > >> > edk2 packages without any dependent platform code, or even a
> > >> > detailed problem statement / purpose description (see e.g. commit
> > >> > 5c9bb86f171c and its surrounding commits). On the other hand,
> > >> > attempts in the past, to add libraries with well demonstrated and
> > >> > direct in-tree use cases, to
> > >> > edk2 core, have been rejected, from other submitters. (Here's one
> > >> > example: <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.) I'm
> > >> > not prying at proprietary platform information, but a new library
> > >> > added to
> > >> > edk2 core *should* be well-justified.
> > >> >
> > >> > The commit message on this patch is empty. It only references
> > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I
> > >> > open the BZ, this is all I get:
> > >> >
> > >> > Need a new TSC library to check the CPUID leaf (EAX=0x15) for TSC.
> > >> > For new platform (start from SKL) can use CPUID and retire/remove
> > >> > the current override from AcpiTimerLib.
> > >> >
> > >> > Does this read like an actual feature request? (TimerLib is an
> > >> > MdePkg library class, so not exactly "niche".)
> > >>
> > >> In comparison, the following email does read like a feature request:
> > >>
> > >> [edk2-devel] Determining TSC frequency programmatically
> > >> https://edk2.groups.io/g/devel/message/45750
> > >> http://mid.mail-archive.com/8EC14D0D-DFA5-412D-A4E1-
> > >> 4D641576D58E@protonmail.com
> > >>
> > >> If the posting is related to TianoCore#1909, then I urge the BZ
> > >> assignee to please reference the message in the TianoCore BZ.
> > >>
> > >> Thanks
> > >> Laszlo
> > >>
> > >>
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-20 11:56 ` Liming Gao
@ 2019-08-20 14:00 ` Zeng, Star
2019-08-21 13:45 ` Liming Gao
0 siblings, 1 reply; 20+ messages in thread
From: Zeng, Star @ 2019-08-20 14:00 UTC (permalink / raw)
To: Gao, Liming, Kuo, Donald, devel@edk2.groups.io, lersek@redhat.com,
Dong, Eric
Cc: Ni, Ray, Chan, Amy, Chaganty, Rangasai V, Lai, Luke, Li, Kevin Y,
leif.lindholm@linaro.org, afish@apple.com, Kinney, Michael D,
Zeng, Star
Remember to add entry for it at https://github.com/tianocore/tianocore.github.io/wiki/EDK-II-Release-Planning.
> -----Original Message-----
> From: Gao, Liming
> Sent: Tuesday, August 20, 2019 7:56 PM
> To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan, Amy
> <amy.chan@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin Y
> <kevin.y.li@intel.com>; leif.lindholm@linaro.org; afish@apple.com; Kinney,
> Michael D <michael.d.kinney@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> using CPUID(0x15) TSC leaf
>
> Donald:
> Thanks for your update. If no other comment, I will help push this patch
> tomorrow.
>
> Thanks
> Liming
> > -----Original Message-----
> > From: Kuo, Donald
> > Sent: Tuesday, August 20, 2019 3:22 PM
> > To: Gao, Liming <liming.gao@intel.com>; devel@edk2.groups.io;
> > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library
> > by using CPUID(0x15) TSC leaf
> >
> > Hi Liming,
> >
> > Done.
> >
> > Patch is attached to
> > https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> >
> > Another BZ to apply CpuTimerLib will be tracking on:
> > https://bugzilla.tianocore.org/show_bug.cgi?id=2096
> >
> > Thanks,
> > Donald
> >
> > > -----Original Message-----
> > > From: Gao, Liming
> > > Sent: Tuesday, August 20, 2019 2:51 PM
> > > To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> > > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > > Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > library by using CPUID(0x15) TSC leaf
> > >
> > > Donald:
> > > Please also attach the patch linker in BZs.
> > >
> > > And, please submit another BZ for edk2-
> > > platforms\Platform\Intel\KabylakeOpenBoardPkg to apply this new
> > > library instance.
> > >
> > > Thanks
> > > Liming
> > > >-----Original Message-----
> > > >From: Kuo, Donald
> > > >Sent: Tuesday, August 20, 2019 10:44 AM
> > > >To: devel@edk2.groups.io; lersek@redhat.com; Gao, Liming
> > > ><liming.gao@intel.com>; Dong, Eric <eric.dong@intel.com>
> > > >Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > >Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > ><rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>;
> > > >Li, Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > >afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > > >Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > >library by using CPUID(0x15) TSC leaf
> > > >
> > > >Thanks Laszlo help to review and great feedbacks. That we did miss
> > > >to fulfil
> > > BZ.
> > > >
> > > >I had updated Bugzilla
> > > >https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> > > >for more documentation.
> > > >
> > > >As I know for the edk2-platforms should be consumed as KBL (7th
> > > >Generation) platform in Client, and this feature based on SDM is
> > > >supported on SKL (6th Generation, Family 06h) onwards. So it's ok
> > > >to use as TimerLib instances for edk2-platforms.
> > > >
> > > >And I think the library is new instances for TimerLib for supported
> > > >CPU, and those non-supported CPU will still keep using AcpiTimerlib
> > > >as TimerLib instances.
> > > >
> > > >Thanks,
> > > >Donald
> > > >
> > > >> -----Original Message-----
> > > >> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On
> > > >> Behalf Of Laszlo Ersek
> > > >> Sent: Saturday, August 17, 2019 4:40 AM
> > > >> To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald
> > > >> <donald.kuo@intel.com>; Dong, Eric <eric.dong@intel.com>;
> > > >> devel@edk2.groups.io
> > > >> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > >> Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > >> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>;
> > > >> Li, Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > >> afish@apple.com;
> > > >Kinney,
> > > >> Michael D <michael.d.kinney@intel.com>
> > > >> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > >> library by using CPUID(0x15) TSC leaf
> > > >>
> > > >> On 08/16/19 18:16, Laszlo Ersek wrote:
> > > >> > On 08/15/19 06:02, Gao, Liming wrote:
> > > >> >> Donald: This change is a new feature. Now, it is not in edk2
> > > >> >> feature planning list. If you want to catch it into 201908
> > > >> >> stable tag, please get approve from Stewards first. I have cc
> > > >> >> this mail to all
> > > Stewards.
> > > >> > - I don't mind adding a new feature, as long as it gets
> > > >> > properly reviewed by package owners before we enter the soft
> feature freeze.
> > > >> >
> > > >> > - Looking at the BZ
> > > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a bit
> > > >> > more documentation would be nice.
> > > >> >
> > > >> > - On the negative side, I'm very much *not* a fan of adding
> > > >> > features to the open source edk2 tree without actually
> > > >> > *consuming* the feature in an open source tree. Are the new
> > > >> > library instances going to be put to use in edk2-platforms, perhaps?
> > > >> >
> > > >> > We discussed this topic earlier on some of the stewards' calls.
> > > >> > On one hand, it's not uncommon to see library instances from
> > > >> > Intel enter core
> > > >> > edk2 packages without any dependent platform code, or even a
> > > >> > detailed problem statement / purpose description (see e.g.
> > > >> > commit 5c9bb86f171c and its surrounding commits). On the other
> > > >> > hand, attempts in the past, to add libraries with well
> > > >> > demonstrated and direct in-tree use cases, to
> > > >> > edk2 core, have been rejected, from other submitters. (Here's
> > > >> > one
> > > >> > example: <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.)
> > > >> > I'm not prying at proprietary platform information, but a new
> > > >> > library added to
> > > >> > edk2 core *should* be well-justified.
> > > >> >
> > > >> > The commit message on this patch is empty. It only references
> > > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I
> > > >> > open the BZ, this is all I get:
> > > >> >
> > > >> > Need a new TSC library to check the CPUID leaf (EAX=0x15) for TSC.
> > > >> > For new platform (start from SKL) can use CPUID and
> retire/remove
> > > >> > the current override from AcpiTimerLib.
> > > >> >
> > > >> > Does this read like an actual feature request? (TimerLib is an
> > > >> > MdePkg library class, so not exactly "niche".)
> > > >>
> > > >> In comparison, the following email does read like a feature request:
> > > >>
> > > >> [edk2-devel] Determining TSC frequency programmatically
> > > >> https://edk2.groups.io/g/devel/message/45750
> > > >> http://mid.mail-archive.com/8EC14D0D-DFA5-412D-A4E1-
> > > >> 4D641576D58E@protonmail.com
> > > >>
> > > >> If the posting is related to TianoCore#1909, then I urge the BZ
> > > >> assignee to please reference the message in the TianoCore BZ.
> > > >>
> > > >> Thanks
> > > >> Laszlo
> > > >>
> > > >>
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-20 14:00 ` Zeng, Star
@ 2019-08-21 13:45 ` Liming Gao
2019-08-21 14:54 ` Donald Kuo
0 siblings, 1 reply; 20+ messages in thread
From: Liming Gao @ 2019-08-21 13:45 UTC (permalink / raw)
To: Zeng, Star, Kuo, Donald, devel@edk2.groups.io, lersek@redhat.com,
Dong, Eric
Cc: Ni, Ray, Chan, Amy, Chaganty, Rangasai V, Lai, Luke, Li, Kevin Y,
leif.lindholm@linaro.org, afish@apple.com, Kinney, Michael D
Done. And, push @30781febe2106cc0d7186e70136120353cd67df2
Thanks
Liming
> -----Original Message-----
> From: Zeng, Star
> Sent: Tuesday, August 20, 2019 10:00 PM
> To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io; lersek@redhat.com; Dong, Eric
> <eric.dong@intel.com>
> Cc: Ni, Ray <ray.ni@intel.com>; Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>; Lai, Luke
> <luke.lai@intel.com>; Li, Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org; afish@apple.com; Kinney, Michael D
> <michael.d.kinney@intel.com>; Zeng, Star <star.zeng@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
>
> Remember to add entry for it at https://github.com/tianocore/tianocore.github.io/wiki/EDK-II-Release-Planning.
>
> > -----Original Message-----
> > From: Gao, Liming
> > Sent: Tuesday, August 20, 2019 7:56 PM
> > To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan, Amy
> > <amy.chan@intel.com>; Chaganty, Rangasai V
> > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin Y
> > <kevin.y.li@intel.com>; leif.lindholm@linaro.org; afish@apple.com; Kinney,
> > Michael D <michael.d.kinney@intel.com>
> > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> > using CPUID(0x15) TSC leaf
> >
> > Donald:
> > Thanks for your update. If no other comment, I will help push this patch
> > tomorrow.
> >
> > Thanks
> > Liming
> > > -----Original Message-----
> > > From: Kuo, Donald
> > > Sent: Tuesday, August 20, 2019 3:22 PM
> > > To: Gao, Liming <liming.gao@intel.com>; devel@edk2.groups.io;
> > > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > > Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library
> > > by using CPUID(0x15) TSC leaf
> > >
> > > Hi Liming,
> > >
> > > Done.
> > >
> > > Patch is attached to
> > > https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> > >
> > > Another BZ to apply CpuTimerLib will be tracking on:
> > > https://bugzilla.tianocore.org/show_bug.cgi?id=2096
> > >
> > > Thanks,
> > > Donald
> > >
> > > > -----Original Message-----
> > > > From: Gao, Liming
> > > > Sent: Tuesday, August 20, 2019 2:51 PM
> > > > To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> > > > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > > > Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > > afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > > > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > > library by using CPUID(0x15) TSC leaf
> > > >
> > > > Donald:
> > > > Please also attach the patch linker in BZs.
> > > >
> > > > And, please submit another BZ for edk2-
> > > > platforms\Platform\Intel\KabylakeOpenBoardPkg to apply this new
> > > > library instance.
> > > >
> > > > Thanks
> > > > Liming
> > > > >-----Original Message-----
> > > > >From: Kuo, Donald
> > > > >Sent: Tuesday, August 20, 2019 10:44 AM
> > > > >To: devel@edk2.groups.io; lersek@redhat.com; Gao, Liming
> > > > ><liming.gao@intel.com>; Dong, Eric <eric.dong@intel.com>
> > > > >Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > > >Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > > ><rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>;
> > > > >Li, Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > > >afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > > > >Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > > >library by using CPUID(0x15) TSC leaf
> > > > >
> > > > >Thanks Laszlo help to review and great feedbacks. That we did miss
> > > > >to fulfil
> > > > BZ.
> > > > >
> > > > >I had updated Bugzilla
> > > > >https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> > > > >for more documentation.
> > > > >
> > > > >As I know for the edk2-platforms should be consumed as KBL (7th
> > > > >Generation) platform in Client, and this feature based on SDM is
> > > > >supported on SKL (6th Generation, Family 06h) onwards. So it's ok
> > > > >to use as TimerLib instances for edk2-platforms.
> > > > >
> > > > >And I think the library is new instances for TimerLib for supported
> > > > >CPU, and those non-supported CPU will still keep using AcpiTimerlib
> > > > >as TimerLib instances.
> > > > >
> > > > >Thanks,
> > > > >Donald
> > > > >
> > > > >> -----Original Message-----
> > > > >> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On
> > > > >> Behalf Of Laszlo Ersek
> > > > >> Sent: Saturday, August 17, 2019 4:40 AM
> > > > >> To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald
> > > > >> <donald.kuo@intel.com>; Dong, Eric <eric.dong@intel.com>;
> > > > >> devel@edk2.groups.io
> > > > >> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > > >> Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > > >> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>;
> > > > >> Li, Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > > >> afish@apple.com;
> > > > >Kinney,
> > > > >> Michael D <michael.d.kinney@intel.com>
> > > > >> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > > >> library by using CPUID(0x15) TSC leaf
> > > > >>
> > > > >> On 08/16/19 18:16, Laszlo Ersek wrote:
> > > > >> > On 08/15/19 06:02, Gao, Liming wrote:
> > > > >> >> Donald: This change is a new feature. Now, it is not in edk2
> > > > >> >> feature planning list. If you want to catch it into 201908
> > > > >> >> stable tag, please get approve from Stewards first. I have cc
> > > > >> >> this mail to all
> > > > Stewards.
> > > > >> > - I don't mind adding a new feature, as long as it gets
> > > > >> > properly reviewed by package owners before we enter the soft
> > feature freeze.
> > > > >> >
> > > > >> > - Looking at the BZ
> > > > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a bit
> > > > >> > more documentation would be nice.
> > > > >> >
> > > > >> > - On the negative side, I'm very much *not* a fan of adding
> > > > >> > features to the open source edk2 tree without actually
> > > > >> > *consuming* the feature in an open source tree. Are the new
> > > > >> > library instances going to be put to use in edk2-platforms, perhaps?
> > > > >> >
> > > > >> > We discussed this topic earlier on some of the stewards' calls.
> > > > >> > On one hand, it's not uncommon to see library instances from
> > > > >> > Intel enter core
> > > > >> > edk2 packages without any dependent platform code, or even a
> > > > >> > detailed problem statement / purpose description (see e.g.
> > > > >> > commit 5c9bb86f171c and its surrounding commits). On the other
> > > > >> > hand, attempts in the past, to add libraries with well
> > > > >> > demonstrated and direct in-tree use cases, to
> > > > >> > edk2 core, have been rejected, from other submitters. (Here's
> > > > >> > one
> > > > >> > example: <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.)
> > > > >> > I'm not prying at proprietary platform information, but a new
> > > > >> > library added to
> > > > >> > edk2 core *should* be well-justified.
> > > > >> >
> > > > >> > The commit message on this patch is empty. It only references
> > > > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I
> > > > >> > open the BZ, this is all I get:
> > > > >> >
> > > > >> > Need a new TSC library to check the CPUID leaf (EAX=0x15) for TSC.
> > > > >> > For new platform (start from SKL) can use CPUID and
> > retire/remove
> > > > >> > the current override from AcpiTimerLib.
> > > > >> >
> > > > >> > Does this read like an actual feature request? (TimerLib is an
> > > > >> > MdePkg library class, so not exactly "niche".)
> > > > >>
> > > > >> In comparison, the following email does read like a feature request:
> > > > >>
> > > > >> [edk2-devel] Determining TSC frequency programmatically
> > > > >> https://edk2.groups.io/g/devel/message/45750
> > > > >> http://mid.mail-archive.com/8EC14D0D-DFA5-412D-A4E1-
> > > > >> 4D641576D58E@protonmail.com
> > > > >>
> > > > >> If the posting is related to TianoCore#1909, then I urge the BZ
> > > > >> assignee to please reference the message in the TianoCore BZ.
> > > > >>
> > > > >> Thanks
> > > > >> Laszlo
> > > > >>
> > > > >>
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf
2019-08-21 13:45 ` Liming Gao
@ 2019-08-21 14:54 ` Donald Kuo
0 siblings, 0 replies; 20+ messages in thread
From: Donald Kuo @ 2019-08-21 14:54 UTC (permalink / raw)
To: Gao, Liming, Zeng, Star, devel@edk2.groups.io, lersek@redhat.com,
Dong, Eric
Cc: Ni, Ray, Chan, Amy, Chaganty, Rangasai V, Lai, Luke, Li, Kevin Y,
leif.lindholm@linaro.org, afish@apple.com, Kinney, Michael D
Thanks Liming help :)
Donald
> -----Original Message-----
> From: Gao, Liming
> Sent: Wednesday, August 21, 2019 9:46 PM
> To: Zeng, Star <star.zeng@intel.com>; Kuo, Donald <donald.kuo@intel.com>;
> devel@edk2.groups.io; lersek@redhat.com; Dong, Eric
> <eric.dong@intel.com>
> Cc: Ni, Ray <ray.ni@intel.com>; Chan, Amy <amy.chan@intel.com>;
> Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>; Lai, Luke
> <luke.lai@intel.com>; Li, Kevin Y <kevin.y.li@intel.com>;
> leif.lindholm@linaro.org; afish@apple.com; Kinney, Michael D
> <michael.d.kinney@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> using CPUID(0x15) TSC leaf
>
> Done. And, push @30781febe2106cc0d7186e70136120353cd67df2
>
> Thanks
> Liming
> > -----Original Message-----
> > From: Zeng, Star
> > Sent: Tuesday, August 20, 2019 10:00 PM
> > To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald
> > <donald.kuo@intel.com>; devel@edk2.groups.io; lersek@redhat.com;
> Dong,
> > Eric <eric.dong@intel.com>
> > Cc: Ni, Ray <ray.ni@intel.com>; Chan, Amy <amy.chan@intel.com>;
> > Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>; Lai, Luke
> > <luke.lai@intel.com>; Li, Kevin Y <kevin.y.li@intel.com>;
> > leif.lindholm@linaro.org; afish@apple.com; Kinney, Michael D
> > <michael.d.kinney@intel.com>; Zeng, Star <star.zeng@intel.com>
> > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library
> > by using CPUID(0x15) TSC leaf
> >
> > Remember to add entry for it at
> https://github.com/tianocore/tianocore.github.io/wiki/EDK-II-Release-
> Planning.
> >
> > > -----Original Message-----
> > > From: Gao, Liming
> > > Sent: Tuesday, August 20, 2019 7:56 PM
> > > To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> > > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > > Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > library by using CPUID(0x15) TSC leaf
> > >
> > > Donald:
> > > Thanks for your update. If no other comment, I will help push this
> > > patch tomorrow.
> > >
> > > Thanks
> > > Liming
> > > > -----Original Message-----
> > > > From: Kuo, Donald
> > > > Sent: Tuesday, August 20, 2019 3:22 PM
> > > > To: Gao, Liming <liming.gao@intel.com>; devel@edk2.groups.io;
> > > > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>;
> > > > Li, Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > > afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > > > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > > library by using CPUID(0x15) TSC leaf
> > > >
> > > > Hi Liming,
> > > >
> > > > Done.
> > > >
> > > > Patch is attached to
> > > > https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> > > >
> > > > Another BZ to apply CpuTimerLib will be tracking on:
> > > > https://bugzilla.tianocore.org/show_bug.cgi?id=2096
> > > >
> > > > Thanks,
> > > > Donald
> > > >
> > > > > -----Original Message-----
> > > > > From: Gao, Liming
> > > > > Sent: Tuesday, August 20, 2019 2:51 PM
> > > > > To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> > > > > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > > > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star
> > > > > <star.zeng@intel.com>; Chan, Amy <amy.chan@intel.com>;
> Chaganty,
> > > > > Rangasai V <rangasai.v.chaganty@intel.com>; Lai, Luke
> > > > > <luke.lai@intel.com>; Li, Kevin Y <kevin.y.li@intel.com>;
> > > > > leif.lindholm@linaro.org; afish@apple.com; Kinney, Michael D
> > > > > <michael.d.kinney@intel.com>
> > > > > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > > > library by using CPUID(0x15) TSC leaf
> > > > >
> > > > > Donald:
> > > > > Please also attach the patch linker in BZs.
> > > > >
> > > > > And, please submit another BZ for edk2-
> > > > > platforms\Platform\Intel\KabylakeOpenBoardPkg to apply this new
> > > > > library instance.
> > > > >
> > > > > Thanks
> > > > > Liming
> > > > > >-----Original Message-----
> > > > > >From: Kuo, Donald
> > > > > >Sent: Tuesday, August 20, 2019 10:44 AM
> > > > > >To: devel@edk2.groups.io; lersek@redhat.com; Gao, Liming
> > > > > ><liming.gao@intel.com>; Dong, Eric <eric.dong@intel.com>
> > > > > >Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star
> > > > > ><star.zeng@intel.com>; Chan, Amy <amy.chan@intel.com>;
> > > > > >Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>; Lai, Luke
> > > > > ><luke.lai@intel.com>; Li, Kevin Y <kevin.y.li@intel.com>;
> > > > > >leif.lindholm@linaro.org; afish@apple.com; Kinney, Michael D
> > > > > ><michael.d.kinney@intel.com>
> > > > > >Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > > > >library by using CPUID(0x15) TSC leaf
> > > > > >
> > > > > >Thanks Laszlo help to review and great feedbacks. That we did
> > > > > >miss to fulfil
> > > > > BZ.
> > > > > >
> > > > > >I had updated Bugzilla
> > > > > >https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> > > > > >for more documentation.
> > > > > >
> > > > > >As I know for the edk2-platforms should be consumed as KBL (7th
> > > > > >Generation) platform in Client, and this feature based on SDM
> > > > > >is supported on SKL (6th Generation, Family 06h) onwards. So
> > > > > >it's ok to use as TimerLib instances for edk2-platforms.
> > > > > >
> > > > > >And I think the library is new instances for TimerLib for
> > > > > >supported CPU, and those non-supported CPU will still keep
> > > > > >using AcpiTimerlib as TimerLib instances.
> > > > > >
> > > > > >Thanks,
> > > > > >Donald
> > > > > >
> > > > > >> -----Original Message-----
> > > > > >> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On
> > > > > >> Behalf Of Laszlo Ersek
> > > > > >> Sent: Saturday, August 17, 2019 4:40 AM
> > > > > >> To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald
> > > > > >> <donald.kuo@intel.com>; Dong, Eric <eric.dong@intel.com>;
> > > > > >> devel@edk2.groups.io
> > > > > >> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star
> > > > > >> <star.zeng@intel.com>; Chan, Amy <amy.chan@intel.com>;
> > > > > >> Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>; Lai,
> > > > > >> Luke <luke.lai@intel.com>; Li, Kevin Y
> > > > > >> <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > > > >> afish@apple.com;
> > > > > >Kinney,
> > > > > >> Michael D <michael.d.kinney@intel.com>
> > > > > >> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new
> > > > > >> TSC library by using CPUID(0x15) TSC leaf
> > > > > >>
> > > > > >> On 08/16/19 18:16, Laszlo Ersek wrote:
> > > > > >> > On 08/15/19 06:02, Gao, Liming wrote:
> > > > > >> >> Donald: This change is a new feature. Now, it is not in
> > > > > >> >> edk2 feature planning list. If you want to catch it into
> > > > > >> >> 201908 stable tag, please get approve from Stewards first.
> > > > > >> >> I have cc this mail to all
> > > > > Stewards.
> > > > > >> > - I don't mind adding a new feature, as long as it gets
> > > > > >> > properly reviewed by package owners before we enter the
> > > > > >> > soft
> > > feature freeze.
> > > > > >> >
> > > > > >> > - Looking at the BZ
> > > > > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a
> > > > > >> > bit more documentation would be nice.
> > > > > >> >
> > > > > >> > - On the negative side, I'm very much *not* a fan of adding
> > > > > >> > features to the open source edk2 tree without actually
> > > > > >> > *consuming* the feature in an open source tree. Are the new
> > > > > >> > library instances going to be put to use in edk2-platforms,
> perhaps?
> > > > > >> >
> > > > > >> > We discussed this topic earlier on some of the stewards' calls.
> > > > > >> > On one hand, it's not uncommon to see library instances
> > > > > >> > from Intel enter core
> > > > > >> > edk2 packages without any dependent platform code, or even
> > > > > >> > a detailed problem statement / purpose description (see e.g.
> > > > > >> > commit 5c9bb86f171c and its surrounding commits). On the
> > > > > >> > other hand, attempts in the past, to add libraries with
> > > > > >> > well demonstrated and direct in-tree use cases, to
> > > > > >> > edk2 core, have been rejected, from other submitters.
> > > > > >> > (Here's one
> > > > > >> > example:
> > > > > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.)
> > > > > >> > I'm not prying at proprietary platform information, but a
> > > > > >> > new library added to
> > > > > >> > edk2 core *should* be well-justified.
> > > > > >> >
> > > > > >> > The commit message on this patch is empty. It only
> > > > > >> > references
> > > > > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I
> open the BZ, this is all I get:
> > > > > >> >
> > > > > >> > Need a new TSC library to check the CPUID leaf (EAX=0x15) for
> TSC.
> > > > > >> > For new platform (start from SKL) can use CPUID and
> > > retire/remove
> > > > > >> > the current override from AcpiTimerLib.
> > > > > >> >
> > > > > >> > Does this read like an actual feature request? (TimerLib is
> > > > > >> > an MdePkg library class, so not exactly "niche".)
> > > > > >>
> > > > > >> In comparison, the following email does read like a feature request:
> > > > > >>
> > > > > >> [edk2-devel] Determining TSC frequency programmatically
> > > > > >> https://edk2.groups.io/g/devel/message/45750
> > > > > >> http://mid.mail-archive.com/8EC14D0D-DFA5-412D-A4E1-
> > > > > >> 4D641576D58E@protonmail.com
> > > > > >>
> > > > > >> If the posting is related to TianoCore#1909, then I urge the
> > > > > >> BZ assignee to please reference the message in the TianoCore BZ.
> > > > > >>
> > > > > >> Thanks
> > > > > >> Laszlo
> > > > > >>
> > > > > >>
^ permalink raw reply [flat|nested] 20+ messages in thread
end of thread, other threads:[~2019-08-21 14:54 UTC | newest]
Thread overview: 20+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2019-08-13 10:53 [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf Donald Kuo
2019-08-15 2:45 ` [edk2-devel] " Dong, Eric
2019-08-15 3:02 ` Donald Kuo
2019-08-15 4:02 ` Liming Gao
2019-08-15 4:40 ` Donald Kuo
2019-08-16 16:16 ` Laszlo Ersek
2019-08-16 20:40 ` Laszlo Ersek
2019-08-20 2:43 ` Donald Kuo
2019-08-20 6:51 ` Liming Gao
2019-08-20 7:21 ` Donald Kuo
2019-08-20 11:56 ` Liming Gao
2019-08-20 14:00 ` Zeng, Star
2019-08-21 13:45 ` Liming Gao
2019-08-21 14:54 ` Donald Kuo
-- strict thread matches above, loose matches on Subject: below --
2019-08-15 4:37 Donald Kuo
2019-08-15 7:20 ` [edk2-devel] " Vitaly Cheptsov
2019-08-15 8:40 ` Donald Kuo
2019-08-15 12:09 ` Vitaly Cheptsov
2019-08-15 16:23 ` Michael D Kinney
2019-08-16 6:56 ` Donald Kuo
2019-08-16 8:07 ` Vitaly Cheptsov
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