* [edk2 0/3] v3 RISC-V SBI-backed SerialLib
@ 2023-03-03 18:04 Andrei Warkentin
2023-03-03 18:04 ` [edk2 1/3] MdePkg: BaseRiscVSbiLib: make more useful to consumers Andrei Warkentin
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Andrei Warkentin @ 2023-03-03 18:04 UTC (permalink / raw)
To: devel; +Cc: Andrei Warkentin
Hello!
Here are three patches that provide a SerialLib backed by SBI console.
Both legacy and DBCN mechanisms are supported in various execution
environments and have been tested with UART and HTIF consoles.
This is also available at
https://github.com/andreiw/edk2-rv-wip/tree/patchset-2
Compared to v2:
- Probes legacy extension as well.
- Encode supported module types in the INF file. This is done using LIBRARY_CLASS,
as MODULE_TYPE cannot encode multiple types, so MODULE_TYPE is retained as BASE.
- Update INF version and generate brand new GUIDs instead of editing them.
- Checked that all patches retain ^M endings.
Checking patch file: 0001-MdePkg-BaseRiscVSbiLib-make-more-useful-to-consumers.patch
MdePkg: BaseRiscVSbiLib: make more useful to consumers
The commit message format passed all checks.
The code passed all checks.
Checking patch file: 0002-PATCH-v3-MdePkg-add-SBI-based-SeriaPortLib-for-RISC-.patch
[PATCH v3] MdePkg: add SBI-based SeriaPortLib for RISC-V
The commit message format passed all checks.
The code passed all checks.
Checking patch file: 0003-OvmfPkg-RiscVVirt-Add-missing-SerialPortInitialize-t.patch
OvmfPkg: RiscVVirt: Add missing SerialPortInitialize to Sec
The commit message format passed all checks.
The code passed all checks.
Andrei Warkentin (3):
MdePkg: BaseRiscVSbiLib: make more useful to consumers
MdePkg: add SBI-based SeriaPortLib for RISC-V
OvmfPkg: RiscVVirt: Add missing SerialPortInitialize to Sec
MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf | 36 +++
MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf | 39 +++
OvmfPkg/RiscVVirt/Sec/SecMain.inf | 1 +
MdePkg/Include/Library/BaseRiscVSbiLib.h | 40 ++-
OvmfPkg/RiscVVirt/Sec/SecMain.h | 1 +
MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c | 3 +-
MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c | 285 ++++++++++++++++++++
MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c | 233 ++++++++++++++++
OvmfPkg/RiscVVirt/Sec/SecMain.c | 4 +-
MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni | 16 ++
MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni | 16 ++
11 files changed, 668 insertions(+), 6 deletions(-)
create mode 100644 MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf
create mode 100644 MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf
create mode 100644 MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c
create mode 100644 MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c
create mode 100644 MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni
create mode 100644 MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni
--
2.25.1
^ permalink raw reply [flat|nested] 7+ messages in thread
* [edk2 1/3] MdePkg: BaseRiscVSbiLib: make more useful to consumers
2023-03-03 18:04 [edk2 0/3] v3 RISC-V SBI-backed SerialLib Andrei Warkentin
@ 2023-03-03 18:04 ` Andrei Warkentin
2023-03-10 6:23 ` Sunil V L
2023-03-03 18:04 ` [edk2 2/3] [PATCH v3] MdePkg: add SBI-based SeriaPortLib for RISC-V Andrei Warkentin
2023-03-03 18:04 ` [edk2 3/3] OvmfPkg: RiscVVirt: Add missing SerialPortInitialize to Sec Andrei Warkentin
2 siblings, 1 reply; 7+ messages in thread
From: Andrei Warkentin @ 2023-03-03 18:04 UTC (permalink / raw)
To: devel; +Cc: Andrei Warkentin, Daniel Schaefer, Sunil V L, Gerd Hoffmann
Add a few more definitions and make SbiCall and TranslateError
usable (not static) by library users.
Cc: Daniel Schaefer <git@danielschaefer.me>
Cc: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Andrei Warkentin <andrei.warkentin@intel.com>
---
MdePkg/Include/Library/BaseRiscVSbiLib.h | 40 ++++++++++++++++++--
MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c | 3 +-
2 files changed, 38 insertions(+), 5 deletions(-)
diff --git a/MdePkg/Include/Library/BaseRiscVSbiLib.h b/MdePkg/Include/Library/BaseRiscVSbiLib.h
index e75520b4b888..2244165a6b6a 100644
--- a/MdePkg/Include/Library/BaseRiscVSbiLib.h
+++ b/MdePkg/Include/Library/BaseRiscVSbiLib.h
@@ -2,6 +2,7 @@
Library to call the RISC-V SBI ecalls
Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
+ Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -18,10 +19,28 @@
#include <Uefi.h>
/* SBI Extension IDs */
-#define SBI_EXT_TIME 0x54494D45
-#define SBI_EXT_SRST 0x53525354
+#define SBI_EXT_0_1_CONSOLE_PUTCHAR 0x1
+#define SBI_EXT_0_1_CONSOLE_GETCHAR 0x2
+#define SBI_EXT_BASE 0x10
+#define SBI_EXT_DBCN 0x4442434E
+#define SBI_EXT_TIME 0x54494D45
+#define SBI_EXT_SRST 0x53525354
-/* SBI function IDs for TIME extension*/
+/* SBI function IDs for base extension */
+#define SBI_EXT_BASE_SPEC_VERSION 0x0
+#define SBI_EXT_BASE_IMPL_ID 0x1
+#define SBI_EXT_BASE_IMPL_VERSION 0x2
+#define SBI_EXT_BASE_PROBE_EXT 0x3
+#define SBI_EXT_BASE_GET_MVENDORID 0x4
+#define SBI_EXT_BASE_GET_MARCHID 0x5
+#define SBI_EXT_BASE_GET_MIMPID 0x6
+
+/* SBI function IDs for DBCN extension */
+#define SBI_EXT_DBCN_WRITE 0x0
+#define SBI_EXT_DBCN_READ 0x1
+#define SBI_EXT_DBCN_WRITE_BYTE 0x2
+
+/* SBI function IDs for TIME extension */
#define SBI_EXT_TIME_SET_TIMER 0x0
/* SBI function IDs for SRST extension */
@@ -62,6 +81,21 @@ typedef struct {
UINTN Value; ///< Value returned
} SBI_RET;
+SBI_RET
+EFIAPI
+SbiCall (
+ IN UINTN ExtId,
+ IN UINTN FuncId,
+ IN UINTN NumArgs,
+ ...
+ );
+
+EFI_STATUS
+EFIAPI
+TranslateError (
+ IN UINTN SbiError
+ );
+
VOID
EFIAPI
SbiSetTimer (
diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
index 2ba8f5ed366a..1141abfab9d0 100644
--- a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
+++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
@@ -4,6 +4,7 @@
It allows calling an SBI function via an ecall from S-Mode.
Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
+ Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -31,7 +32,6 @@
@retval Returns SBI_RET structure with value and error code.
**/
-STATIC
SBI_RET
EFIAPI
SbiCall (
@@ -88,7 +88,6 @@ SbiCall (
@param[in] SbiError SBI error code
@retval EFI_STATUS
**/
-STATIC
EFI_STATUS
EFIAPI
TranslateError (
--
2.25.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* [edk2 2/3] [PATCH v3] MdePkg: add SBI-based SeriaPortLib for RISC-V
2023-03-03 18:04 [edk2 0/3] v3 RISC-V SBI-backed SerialLib Andrei Warkentin
2023-03-03 18:04 ` [edk2 1/3] MdePkg: BaseRiscVSbiLib: make more useful to consumers Andrei Warkentin
@ 2023-03-03 18:04 ` Andrei Warkentin
2023-03-10 7:19 ` Sunil V L
2023-03-03 18:04 ` [edk2 3/3] OvmfPkg: RiscVVirt: Add missing SerialPortInitialize to Sec Andrei Warkentin
2 siblings, 1 reply; 7+ messages in thread
From: Andrei Warkentin @ 2023-03-03 18:04 UTC (permalink / raw)
To: devel; +Cc: Andrei Warkentin, Daniel Schaefer, Sunil V L, Gerd Hoffmann
These are implementations of SerialPortLib using SBI console services.
- SecPeiRiscVSerialPortLibSbi is appropriate for SEC/PEI (XIP) environments
- PrePiDxeRiscVSerialPortLibSbi is appropriate for PrePI/DXE environments
Tested with:
- Qemu RiscVVirt (non-DBCN case, backed by UART)
- TinyEMU + RiscVVirt (non-DBCN case, HTIF)
- TinyEMU + RiscVVirt (DBCN case, HTIF)
Cc: Daniel Schaefer <git@danielschaefer.me>
Cc: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Andrei Warkentin <andrei.warkentin@intel.com>
---
MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf | 36 +++
MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf | 39 +++
MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c | 285 ++++++++++++++++++++
MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c | 233 ++++++++++++++++
MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni | 16 ++
MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni | 16 ++
6 files changed, 625 insertions(+)
diff --git a/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf
new file mode 100644
index 000000000000..1d8544756bb9
--- /dev/null
+++ b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf
@@ -0,0 +1,36 @@
+## @file
+# Serial Port Library backed by SBI console.
+#
+# Meant for PrePi and DXE environments (where globals are allowed). See
+# SecPeiSerialPortLibRiscVSbi for a reduced variant appropriate for SEC
+# and PEI (XIP) environments.
+#
+# Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001B
+ BASE_NAME = PrePiDxeRiscVSerialPortLibSbi
+ MODULE_UNI_FILE = PrePiDxeRiscVSerialPortLibSbi.uni
+ FILE_GUID = 872af743-ab56-45b4-a065-602567f4820c
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = SerialPortLib | SEC DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER UEFI_DRIVER UEFI_APPLICATION
+
+
+#
+# VALID_ARCHITECTURES = RISCV64
+#
+
+[Sources]
+ PrePiDxeRiscVSerialPortLibSbi.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+
+[LibraryClasses]
+ RiscVSbiLib
diff --git a/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf
new file mode 100644
index 000000000000..7bc7cd47c11c
--- /dev/null
+++ b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf
@@ -0,0 +1,39 @@
+## @file
+# Serial Port Library backed by SBI console.
+#
+# Meant for SEC and PEI (XIP) environments.
+#
+# Due to limitations of SBI console interface and XIP environments
+# (on use of globals), this library instance does not implement reading
+# and polling the serial port. See PrePiDxeSerialPortLibRiscVSbi for
+# the full-featured variant meant for PrePi and DXE environments.
+#
+# Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001B
+ BASE_NAME = SecPeiRiscVSerialPortLibSbi
+ MODULE_UNI_FILE = SecPeiRiscVSerialPortLibSbi.uni
+ FILE_GUID = 639fad38-4bfd-4eb9-9f09-e97c7947d480
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = SerialPortLib | SEC PEI_CORE PEIM
+
+
+#
+# VALID_ARCHITECTURES = RISCV64
+#
+
+[Sources]
+ SecPeiRiscVSerialPortLibSbi.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+
+[LibraryClasses]
+ RiscVSbiLib
diff --git a/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c
new file mode 100644
index 000000000000..cedda04ee5aa
--- /dev/null
+++ b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c
@@ -0,0 +1,285 @@
+/** @file
+ Serial Port Library backed by SBI console.
+
+ Meant for PrePi and DXE environments (where globals are allowed). See
+ SecPeiSerialPortLibRiscVSbi for a reduced variant appropriate for SEC
+ and PEI (XIP) environments.
+
+ Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/SerialPortLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+
+STATIC BOOLEAN mHaveDbcn = FALSE;
+STATIC BOOLEAN mHaveLegacyPutchar = FALSE;
+STATIC BOOLEAN mHaveLegacyGetchar = FALSE;
+STATIC INT64 mLastGetChar = -1;
+
+/**
+ Initialize the serial device hardware.
+
+ If no initialization is required, then return RETURN_SUCCESS.
+ If the serial device was successfully initialized, then return RETURN_SUCCESS.
+ If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
+
+ @retval RETURN_SUCCESS The serial device was initialized.
+ @retval RETURN_DEVICE_ERROR The serial device could not be initialized.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortInitialize (
+ VOID
+ )
+{
+ SBI_RET Ret;
+
+ Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_DBCN);
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value != 0))
+ {
+ mHaveDbcn = TRUE;
+ } else {
+ Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_0_1_CONSOLE_PUTCHAR);
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value != 0))
+ {
+ mHaveLegacyPutchar = TRUE;
+ }
+
+ Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_0_1_CONSOLE_GETCHAR);
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value != 0))
+ {
+ mHaveLegacyGetchar = TRUE;
+ }
+ }
+
+ return RETURN_SUCCESS;
+}
+
+/**
+ Write data from buffer to serial device.
+
+ Writes NumberOfBytes data bytes from Buffer to the serial device.
+ The number of bytes actually written to the serial device is returned.
+ If the return value is less than NumberOfBytes, then the write operation failed.
+ If Buffer is NULL, then ASSERT().
+ If NumberOfBytes is zero, then return 0.
+
+ @param Buffer The pointer to the data buffer to be written.
+ @param NumberOfBytes The number of bytes to written to the serial device.
+
+ @retval 0 NumberOfBytes is 0.
+ @retval >0 The number of bytes written to the serial device.
+ If this value is less than NumberOfBytes, then the write operation failed.
+
+**/
+UINTN
+EFIAPI
+SerialPortWrite (
+ IN UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ )
+{
+ UINTN Index;
+
+ if (mHaveDbcn) {
+ SBI_RET Ret;
+ Ret = SbiCall (
+ SBI_EXT_DBCN,
+ SBI_EXT_DBCN_WRITE,
+ 3,
+ NumberOfBytes,
+ ((UINTN)Buffer),
+ 0
+ );
+ if (TranslateError (Ret.Error) != EFI_SUCCESS) {
+ return 0;
+ }
+
+ return Ret.Value;
+ } else if (mHaveLegacyPutchar) {
+ for (Index = 0; Index < NumberOfBytes; Index++) {
+ SbiCall (SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, 1, Buffer[Index]);
+ }
+
+ return Index;
+ }
+
+ /*
+ * Neither DBCN or legacy extension were present.
+ */
+ return NumberOfBytes;
+}
+
+/**
+ Read data from serial device and save the datas in buffer.
+
+ Reads NumberOfBytes data bytes from a serial device into the buffer
+ specified by Buffer. The number of bytes actually read is returned.
+ If the return value is less than NumberOfBytes, then the rest operation failed.
+ If Buffer is NULL, then ASSERT().
+ If NumberOfBytes is zero, then return 0.
+
+ @param Buffer The pointer to the data buffer to store the data read from the serial device.
+ @param NumberOfBytes The number of bytes which will be read.
+
+ @retval 0 Read data failed; No data is to be read.
+ @retval >0 The actual number of bytes read from serial device.
+
+**/
+UINTN
+EFIAPI
+SerialPortRead (
+ OUT UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ )
+{
+ UINTN Index = 0;
+
+ while ((Index < NumberOfBytes) && SerialPortPoll ()) {
+ Buffer[Index++] = (UINT8)mLastGetChar;
+ mLastGetChar = -1;
+ }
+
+ return Index;
+}
+
+/**
+ Polls a serial device to see if there is any data waiting to be read.
+
+ Polls a serial device to see if there is any data waiting to be read.
+ If there is data waiting to be read from the serial device, then TRUE is returned.
+ If there is no data waiting to be read from the serial device, then FALSE is returned.
+
+ @retval TRUE Data is waiting to be read from the serial device.
+ @retval FALSE There is no data waiting to be read from the serial device.
+
+**/
+BOOLEAN
+EFIAPI
+SerialPortPoll (
+ VOID
+ )
+{
+ /*
+ * Careful. OpenSBI with HTIF console will return -1 followed by -2
+ * if there is no character received. So just check for values >= 0.
+ */
+
+ if (mLastGetChar >= 0) {
+ return TRUE;
+ }
+
+ if (mHaveDbcn) {
+ UINT8 Buffer;
+ SBI_RET Ret = SbiCall (
+ SBI_EXT_DBCN,
+ SBI_EXT_DBCN_READ,
+ 3,
+ 1,
+ ((UINTN)&Buffer),
+ 0
+ );
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value == 1))
+ {
+ mLastGetChar = Buffer;
+ }
+ } else if (mHaveLegacyGetchar) {
+ mLastGetChar = (INT64)SbiCall (SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0).Error;
+ }
+
+ return mLastGetChar >= 0;
+}
+
+/**
+ Sets the control bits on a serial device.
+
+ @param Control Sets the bits of Control that are settable.
+
+ @retval RETURN_SUCCESS The new control bits were set on the serial device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetControl (
+ IN UINT32 Control
+ )
+{
+ return RETURN_SUCCESS;
+}
+
+/**
+ Retrieve the status of the control bits on a serial device.
+
+ @param Control A pointer to return the current control signals from the serial device.
+
+ @retval RETURN_SUCCESS The control bits were read from the serial device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortGetControl (
+ OUT UINT32 *Control
+ )
+{
+ *Control = 0;
+ return RETURN_SUCCESS;
+}
+
+/**
+ Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
+ data bits, and stop bits on a serial device.
+
+ @param BaudRate The requested baud rate. A BaudRate value of 0 will use the
+ device's default interface speed.
+ On output, the value actually set.
+ @param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the
+ serial interface. A ReceiveFifoDepth value of 0 will use
+ the device's default FIFO depth.
+ On output, the value actually set.
+ @param Timeout The requested time out for a single character in microseconds.
+ This timeout applies to both the transmit and receive side of the
+ interface. A Timeout value of 0 will use the device's default time
+ out value.
+ On output, the value actually set.
+ @param Parity The type of parity to use on this serial device. A Parity value of
+ DefaultParity will use the device's default parity value.
+ On output, the value actually set.
+ @param DataBits The number of data bits to use on the serial device. A DataBits
+ vaule of 0 will use the device's default data bit setting.
+ On output, the value actually set.
+ @param StopBits The number of stop bits to use on this serial device. A StopBits
+ value of DefaultStopBits will use the device's default number of
+ stop bits.
+ On output, the value actually set.
+
+ @retval RETURN_SUCCESS The new attributes were set on the serial device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.
+ @retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetAttributes (
+ IN OUT UINT64 *BaudRate,
+ IN OUT UINT32 *ReceiveFifoDepth,
+ IN OUT UINT32 *Timeout,
+ IN OUT EFI_PARITY_TYPE *Parity,
+ IN OUT UINT8 *DataBits,
+ IN OUT EFI_STOP_BITS_TYPE *StopBits
+ )
+{
+ return RETURN_SUCCESS;
+}
diff --git a/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c
new file mode 100644
index 000000000000..0ad5931be3ae
--- /dev/null
+++ b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c
@@ -0,0 +1,233 @@
+/** @file
+ Serial Port Library backed by SBI console.
+
+ Meant for SEC and PEI (XIP) environments.
+
+ Due to limitations of SBI console interface and XIP environments
+ (on use of globals), this library instance does not implement reading
+ and polling the serial port. See PrePiDxeSerialPortLibRiscVSbi for
+ the full-featured variant meant for PrePi and DXE environments.
+
+ Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/SerialPortLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+
+/**
+ Initialize the serial device hardware.
+
+ If no initialization is required, then return RETURN_SUCCESS.
+ If the serial device was successfully initialized, then return RETURN_SUCCESS.
+ If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
+
+ @retval RETURN_SUCCESS The serial device was initialized.
+ @retval RETURN_DEVICE_ERROR The serial device could not be initialized.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortInitialize (
+ VOID
+ )
+{
+ return RETURN_SUCCESS;
+}
+
+/**
+ Write data from buffer to serial device.
+
+ Writes NumberOfBytes data bytes from Buffer to the serial device.
+ The number of bytes actually written to the serial device is returned.
+ If the return value is less than NumberOfBytes, then the write operation failed.
+ If Buffer is NULL, then ASSERT().
+ If NumberOfBytes is zero, then return 0.
+
+ @param Buffer The pointer to the data buffer to be written.
+ @param NumberOfBytes The number of bytes to written to the serial device.
+
+ @retval 0 NumberOfBytes is 0.
+ @retval >0 The number of bytes written to the serial device.
+ If this value is less than NumberOfBytes, then the write operation failed.
+
+**/
+UINTN
+EFIAPI
+SerialPortWrite (
+ IN UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ )
+{
+ SBI_RET Ret;
+ UINTN Index;
+
+ Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_DBCN);
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value != 0))
+ {
+ Ret = SbiCall (
+ SBI_EXT_DBCN,
+ SBI_EXT_DBCN_WRITE,
+ 3,
+ NumberOfBytes,
+ ((UINTN)Buffer),
+ 0
+ );
+ if (TranslateError (Ret.Error) != EFI_SUCCESS) {
+ return 0;
+ }
+
+ return Ret.Value;
+ }
+
+ Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_0_1_CONSOLE_PUTCHAR);
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value != 0))
+ {
+ for (Index = 0; Index < NumberOfBytes; Index++) {
+ SbiCall (SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, 1, Buffer[Index]);
+ }
+
+ return Index;
+ }
+
+ /*
+ * Neither DBCN or legacy extension were present.
+ */
+ return NumberOfBytes;
+}
+
+/**
+ Read data from serial device and save the datas in buffer.
+
+ Reads NumberOfBytes data bytes from a serial device into the buffer
+ specified by Buffer. The number of bytes actually read is returned.
+ If the return value is less than NumberOfBytes, then the rest operation failed.
+ If Buffer is NULL, then ASSERT().
+ If NumberOfBytes is zero, then return 0.
+
+ @param Buffer The pointer to the data buffer to store the data read from the serial device.
+ @param NumberOfBytes The number of bytes which will be read.
+
+ @retval 0 Read data failed; No data is to be read.
+ @retval >0 The actual number of bytes read from serial device.
+
+**/
+UINTN
+EFIAPI
+SerialPortRead (
+ OUT UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ )
+{
+ return 0;
+}
+
+/**
+ Polls a serial device to see if there is any data waiting to be read.
+
+ Polls a serial device to see if there is any data waiting to be read.
+ If there is data waiting to be read from the serial device, then TRUE is returned.
+ If there is no data waiting to be read from the serial device, then FALSE is returned.
+
+ @retval TRUE Data is waiting to be read from the serial device.
+ @retval FALSE There is no data waiting to be read from the serial device.
+
+**/
+BOOLEAN
+EFIAPI
+SerialPortPoll (
+ VOID
+ )
+{
+ return FALSE;
+}
+
+/**
+ Sets the control bits on a serial device.
+
+ @param Control Sets the bits of Control that are settable.
+
+ @retval RETURN_SUCCESS The new control bits were set on the serial device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetControl (
+ IN UINT32 Control
+ )
+{
+ return RETURN_SUCCESS;
+}
+
+/**
+ Retrieve the status of the control bits on a serial device.
+
+ @param Control A pointer to return the current control signals from the serial device.
+
+ @retval RETURN_SUCCESS The control bits were read from the serial device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortGetControl (
+ OUT UINT32 *Control
+ )
+{
+ *Control = 0;
+ return RETURN_SUCCESS;
+}
+
+/**
+ Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
+ data bits, and stop bits on a serial device.
+
+ @param BaudRate The requested baud rate. A BaudRate value of 0 will use the
+ device's default interface speed.
+ On output, the value actually set.
+ @param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the
+ serial interface. A ReceiveFifoDepth value of 0 will use
+ the device's default FIFO depth.
+ On output, the value actually set.
+ @param Timeout The requested time out for a single character in microseconds.
+ This timeout applies to both the transmit and receive side of the
+ interface. A Timeout value of 0 will use the device's default time
+ out value.
+ On output, the value actually set.
+ @param Parity The type of parity to use on this serial device. A Parity value of
+ DefaultParity will use the device's default parity value.
+ On output, the value actually set.
+ @param DataBits The number of data bits to use on the serial device. A DataBits
+ vaule of 0 will use the device's default data bit setting.
+ On output, the value actually set.
+ @param StopBits The number of stop bits to use on this serial device. A StopBits
+ value of DefaultStopBits will use the device's default number of
+ stop bits.
+ On output, the value actually set.
+
+ @retval RETURN_SUCCESS The new attributes were set on the serial device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.
+ @retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetAttributes (
+ IN OUT UINT64 *BaudRate,
+ IN OUT UINT32 *ReceiveFifoDepth,
+ IN OUT UINT32 *Timeout,
+ IN OUT EFI_PARITY_TYPE *Parity,
+ IN OUT UINT8 *DataBits,
+ IN OUT EFI_STOP_BITS_TYPE *StopBits
+ )
+{
+ return RETURN_SUCCESS;
+}
diff --git a/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni
new file mode 100644
index 000000000000..7b22caa5a090
--- /dev/null
+++ b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni
@@ -0,0 +1,16 @@
+// /** @file
+// Serial Port Library backed by SBI console.
+//
+// Serial Port Library backed by SBI console.
+//
+// Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "Serial Port Library backed by SBI console"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Serial Port Library backed by SBI console."
+
diff --git a/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni
new file mode 100644
index 000000000000..7b22caa5a090
--- /dev/null
+++ b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni
@@ -0,0 +1,16 @@
+// /** @file
+// Serial Port Library backed by SBI console.
+//
+// Serial Port Library backed by SBI console.
+//
+// Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "Serial Port Library backed by SBI console"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Serial Port Library backed by SBI console."
+
--
2.25.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* [edk2 3/3] OvmfPkg: RiscVVirt: Add missing SerialPortInitialize to Sec
2023-03-03 18:04 [edk2 0/3] v3 RISC-V SBI-backed SerialLib Andrei Warkentin
2023-03-03 18:04 ` [edk2 1/3] MdePkg: BaseRiscVSbiLib: make more useful to consumers Andrei Warkentin
2023-03-03 18:04 ` [edk2 2/3] [PATCH v3] MdePkg: add SBI-based SeriaPortLib for RISC-V Andrei Warkentin
@ 2023-03-03 18:04 ` Andrei Warkentin
2023-03-10 6:26 ` [edk2-devel] " Sunil V L
2 siblings, 1 reply; 7+ messages in thread
From: Andrei Warkentin @ 2023-03-03 18:04 UTC (permalink / raw)
To: devel; +Cc: Andrei Warkentin, Daniel Schaefer, Sunil V L
If the SerialPortLib had any initialization needed, this
would be skipped in the RiscVVirt Sec. Follow the example
seen elsewhere (ArmVirtPkg PrePi).
Seen with BaseSerialPortLibRiscVSbi not using DBCN in Sec, yet
using DBCN elsewhere.
Cc: Daniel Schaefer <git@danielschaefer.me>
Cc: Sunil V L <sunilvl@ventanamicro.com>
Signed-off-by: Andrei Warkentin <andrei.warkentin@intel.com>
---
OvmfPkg/RiscVVirt/Sec/SecMain.inf | 1 +
OvmfPkg/RiscVVirt/Sec/SecMain.h | 1 +
OvmfPkg/RiscVVirt/Sec/SecMain.c | 4 +++-
3 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/OvmfPkg/RiscVVirt/Sec/SecMain.inf b/OvmfPkg/RiscVVirt/Sec/SecMain.inf
index aed35d3af596..0e2a5785e8a4 100644
--- a/OvmfPkg/RiscVVirt/Sec/SecMain.inf
+++ b/OvmfPkg/RiscVVirt/Sec/SecMain.inf
@@ -48,6 +48,7 @@ [LibraryClasses]
FdtLib
MemoryAllocationLib
HobLib
+ SerialPortLib
[Ppis]
gEfiTemporaryRamSupportPpiGuid # PPI ALWAYS_PRODUCED
diff --git a/OvmfPkg/RiscVVirt/Sec/SecMain.h b/OvmfPkg/RiscVVirt/Sec/SecMain.h
index 83a8058efe40..7c7650f0d298 100644
--- a/OvmfPkg/RiscVVirt/Sec/SecMain.h
+++ b/OvmfPkg/RiscVVirt/Sec/SecMain.h
@@ -29,6 +29,7 @@
#include <Library/PrePiLib.h>
#include <Library/PlatformInitLib.h>
#include <Library/PrePiHobListPointerLib.h>
+#include <Library/SerialPortLib.h>
#include <Register/RiscV64/RiscVImpl.h>
/**
diff --git a/OvmfPkg/RiscVVirt/Sec/SecMain.c b/OvmfPkg/RiscVVirt/Sec/SecMain.c
index adf73f2eb66c..db309ebdf1a3 100644
--- a/OvmfPkg/RiscVVirt/Sec/SecMain.c
+++ b/OvmfPkg/RiscVVirt/Sec/SecMain.c
@@ -1,7 +1,7 @@
/** @file
RISC-V SEC phase module for Qemu Virt.
- Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2008 - 2013, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2022, Ventana Micro Systems Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -57,6 +57,8 @@ SecStartup (
UINT64 StackBase;
UINT32 StackSize;
+ SerialPortInitialize ();
+
//
// Report Status Code to indicate entering SEC core
//
--
2.25.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [edk2 1/3] MdePkg: BaseRiscVSbiLib: make more useful to consumers
2023-03-03 18:04 ` [edk2 1/3] MdePkg: BaseRiscVSbiLib: make more useful to consumers Andrei Warkentin
@ 2023-03-10 6:23 ` Sunil V L
0 siblings, 0 replies; 7+ messages in thread
From: Sunil V L @ 2023-03-10 6:23 UTC (permalink / raw)
To: Andrei Warkentin; +Cc: devel, Daniel Schaefer, Gerd Hoffmann
On Fri, Mar 03, 2023 at 12:04:08PM -0600, Andrei Warkentin wrote:
> Add a few more definitions and make SbiCall and TranslateError
> usable (not static) by library users.
>
> Cc: Daniel Schaefer <git@danielschaefer.me>
> Cc: Sunil V L <sunilvl@ventanamicro.com>
> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
> Signed-off-by: Andrei Warkentin <andrei.warkentin@intel.com>
> ---
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [edk2-devel] [edk2 3/3] OvmfPkg: RiscVVirt: Add missing SerialPortInitialize to Sec
2023-03-03 18:04 ` [edk2 3/3] OvmfPkg: RiscVVirt: Add missing SerialPortInitialize to Sec Andrei Warkentin
@ 2023-03-10 6:26 ` Sunil V L
0 siblings, 0 replies; 7+ messages in thread
From: Sunil V L @ 2023-03-10 6:26 UTC (permalink / raw)
To: devel, andrei.warkentin; +Cc: Daniel Schaefer
On Fri, Mar 03, 2023 at 12:04:10PM -0600, Andrei Warkentin wrote:
> If the SerialPortLib had any initialization needed, this
> would be skipped in the RiscVVirt Sec. Follow the example
> seen elsewhere (ArmVirtPkg PrePi).
>
> Seen with BaseSerialPortLibRiscVSbi not using DBCN in Sec, yet
> using DBCN elsewhere.
>
> Cc: Daniel Schaefer <git@danielschaefer.me>
> Cc: Sunil V L <sunilvl@ventanamicro.com>
> Signed-off-by: Andrei Warkentin <andrei.warkentin@intel.com>
> ---
> OvmfPkg/RiscVVirt/Sec/SecMain.inf | 1 +
> OvmfPkg/RiscVVirt/Sec/SecMain.h | 1 +
> OvmfPkg/RiscVVirt/Sec/SecMain.c | 4 +++-
> 3 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/OvmfPkg/RiscVVirt/Sec/SecMain.inf b/OvmfPkg/RiscVVirt/Sec/SecMain.inf
> index aed35d3af596..0e2a5785e8a4 100644
> --- a/OvmfPkg/RiscVVirt/Sec/SecMain.inf
> +++ b/OvmfPkg/RiscVVirt/Sec/SecMain.inf
> @@ -48,6 +48,7 @@ [LibraryClasses]
> FdtLib
> MemoryAllocationLib
> HobLib
> + SerialPortLib
>
> [Ppis]
> gEfiTemporaryRamSupportPpiGuid # PPI ALWAYS_PRODUCED
> diff --git a/OvmfPkg/RiscVVirt/Sec/SecMain.h b/OvmfPkg/RiscVVirt/Sec/SecMain.h
> index 83a8058efe40..7c7650f0d298 100644
> --- a/OvmfPkg/RiscVVirt/Sec/SecMain.h
> +++ b/OvmfPkg/RiscVVirt/Sec/SecMain.h
> @@ -29,6 +29,7 @@
> #include <Library/PrePiLib.h>
> #include <Library/PlatformInitLib.h>
> #include <Library/PrePiHobListPointerLib.h>
> +#include <Library/SerialPortLib.h>
> #include <Register/RiscV64/RiscVImpl.h>
>
> /**
> diff --git a/OvmfPkg/RiscVVirt/Sec/SecMain.c b/OvmfPkg/RiscVVirt/Sec/SecMain.c
> index adf73f2eb66c..db309ebdf1a3 100644
> --- a/OvmfPkg/RiscVVirt/Sec/SecMain.c
> +++ b/OvmfPkg/RiscVVirt/Sec/SecMain.c
> @@ -1,7 +1,7 @@
> /** @file
> RISC-V SEC phase module for Qemu Virt.
>
> - Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>
> + Copyright (c) 2008 - 2013, Intel Corporation. All rights reserved.<BR>
Should be 2008 - 2023
Otherwise, LGTM.
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [edk2 2/3] [PATCH v3] MdePkg: add SBI-based SeriaPortLib for RISC-V
2023-03-03 18:04 ` [edk2 2/3] [PATCH v3] MdePkg: add SBI-based SeriaPortLib for RISC-V Andrei Warkentin
@ 2023-03-10 7:19 ` Sunil V L
0 siblings, 0 replies; 7+ messages in thread
From: Sunil V L @ 2023-03-10 7:19 UTC (permalink / raw)
To: Andrei Warkentin; +Cc: devel, Daniel Schaefer, Gerd Hoffmann
On Fri, Mar 03, 2023 at 12:04:09PM -0600, Andrei Warkentin wrote:
> These are implementations of SerialPortLib using SBI console services.
> - SecPeiRiscVSerialPortLibSbi is appropriate for SEC/PEI (XIP) environments
> - PrePiDxeRiscVSerialPortLibSbi is appropriate for PrePI/DXE environments
>
> Tested with:
> - Qemu RiscVVirt (non-DBCN case, backed by UART)
> - TinyEMU + RiscVVirt (non-DBCN case, HTIF)
> - TinyEMU + RiscVVirt (DBCN case, HTIF)
>
> Cc: Daniel Schaefer <git@danielschaefer.me>
> Cc: Sunil V L <sunilvl@ventanamicro.com>
> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
> Signed-off-by: Andrei Warkentin <andrei.warkentin@intel.com>
> ---
> MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf | 36 +++
> MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf | 39 +++
> MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c | 285 ++++++++++++++++++++
> MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c | 233 ++++++++++++++++
> MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni | 16 ++
> MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni | 16 ++
> 6 files changed, 625 insertions(+)
>
> diff --git a/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf
> new file mode 100644
> index 000000000000..1d8544756bb9
> --- /dev/null
> +++ b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.inf
> @@ -0,0 +1,36 @@
> +## @file
> +# Serial Port Library backed by SBI console.
> +#
> +# Meant for PrePi and DXE environments (where globals are allowed). See
> +# SecPeiSerialPortLibRiscVSbi for a reduced variant appropriate for SEC
> +# and PEI (XIP) environments.
> +#
> +# Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +#
> +##
> +
> +[Defines]
> + INF_VERSION = 0x0001001B
> + BASE_NAME = PrePiDxeRiscVSerialPortLibSbi
> + MODULE_UNI_FILE = PrePiDxeRiscVSerialPortLibSbi.uni
> + FILE_GUID = 872af743-ab56-45b4-a065-602567f4820c
> + MODULE_TYPE = BASE
> + VERSION_STRING = 1.0
> + LIBRARY_CLASS = SerialPortLib | SEC DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER UEFI_DRIVER UEFI_APPLICATION
> +
> +
> +#
> +# VALID_ARCHITECTURES = RISCV64
> +#
> +
> +[Sources]
> + PrePiDxeRiscVSerialPortLibSbi.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> +
> +[LibraryClasses]
> + RiscVSbiLib
> diff --git a/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf
> new file mode 100644
> index 000000000000..7bc7cd47c11c
> --- /dev/null
> +++ b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.inf
> @@ -0,0 +1,39 @@
> +## @file
> +# Serial Port Library backed by SBI console.
> +#
> +# Meant for SEC and PEI (XIP) environments.
> +#
> +# Due to limitations of SBI console interface and XIP environments
> +# (on use of globals), this library instance does not implement reading
> +# and polling the serial port. See PrePiDxeSerialPortLibRiscVSbi for
> +# the full-featured variant meant for PrePi and DXE environments.
> +#
> +# Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +#
> +##
> +
> +[Defines]
> + INF_VERSION = 0x0001001B
> + BASE_NAME = SecPeiRiscVSerialPortLibSbi
> + MODULE_UNI_FILE = SecPeiRiscVSerialPortLibSbi.uni
> + FILE_GUID = 639fad38-4bfd-4eb9-9f09-e97c7947d480
> + MODULE_TYPE = BASE
> + VERSION_STRING = 1.0
> + LIBRARY_CLASS = SerialPortLib | SEC PEI_CORE PEIM
> +
> +
> +#
> +# VALID_ARCHITECTURES = RISCV64
> +#
> +
> +[Sources]
> + SecPeiRiscVSerialPortLibSbi.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> +
> +[LibraryClasses]
> + RiscVSbiLib
> diff --git a/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c
> new file mode 100644
> index 000000000000..cedda04ee5aa
> --- /dev/null
> +++ b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.c
> @@ -0,0 +1,285 @@
> +/** @file
> + Serial Port Library backed by SBI console.
> +
> + Meant for PrePi and DXE environments (where globals are allowed). See
> + SecPeiSerialPortLibRiscVSbi for a reduced variant appropriate for SEC
> + and PEI (XIP) environments.
> +
> + Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Base.h>
> +#include <Library/SerialPortLib.h>
> +#include <Library/BaseRiscVSbiLib.h>
> +
> +STATIC BOOLEAN mHaveDbcn = FALSE;
> +STATIC BOOLEAN mHaveLegacyPutchar = FALSE;
> +STATIC BOOLEAN mHaveLegacyGetchar = FALSE;
> +STATIC INT64 mLastGetChar = -1;
> +
> +/**
> + Initialize the serial device hardware.
> +
> + If no initialization is required, then return RETURN_SUCCESS.
> + If the serial device was successfully initialized, then return RETURN_SUCCESS.
> + If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
> +
> + @retval RETURN_SUCCESS The serial device was initialized.
> + @retval RETURN_DEVICE_ERROR The serial device could not be initialized.
> +
> +**/
> +RETURN_STATUS
> +EFIAPI
> +SerialPortInitialize (
> + VOID
> + )
> +{
> + SBI_RET Ret;
> +
> + Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_DBCN);
> + if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
> + (Ret.Value != 0))
> + {
> + mHaveDbcn = TRUE;
> + } else {
> + Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_0_1_CONSOLE_PUTCHAR);
> + if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
> + (Ret.Value != 0))
> + {
> + mHaveLegacyPutchar = TRUE;
> + }
> +
> + Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_0_1_CONSOLE_GETCHAR);
> + if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
> + (Ret.Value != 0))
> + {
> + mHaveLegacyGetchar = TRUE;
> + }
> + }
> +
> + return RETURN_SUCCESS;
> +}
> +
> +/**
> + Write data from buffer to serial device.
> +
> + Writes NumberOfBytes data bytes from Buffer to the serial device.
> + The number of bytes actually written to the serial device is returned.
> + If the return value is less than NumberOfBytes, then the write operation failed.
> + If Buffer is NULL, then ASSERT().
> + If NumberOfBytes is zero, then return 0.
> +
> + @param Buffer The pointer to the data buffer to be written.
> + @param NumberOfBytes The number of bytes to written to the serial device.
> +
> + @retval 0 NumberOfBytes is 0.
> + @retval >0 The number of bytes written to the serial device.
> + If this value is less than NumberOfBytes, then the write operation failed.
> +
> +**/
> +UINTN
> +EFIAPI
> +SerialPortWrite (
> + IN UINT8 *Buffer,
> + IN UINTN NumberOfBytes
> + )
> +{
> + UINTN Index;
> +
> + if (mHaveDbcn) {
> + SBI_RET Ret;
> + Ret = SbiCall (
> + SBI_EXT_DBCN,
> + SBI_EXT_DBCN_WRITE,
> + 3,
> + NumberOfBytes,
> + ((UINTN)Buffer),
> + 0
> + );
> + if (TranslateError (Ret.Error) != EFI_SUCCESS) {
> + return 0;
> + }
> +
> + return Ret.Value;
> + } else if (mHaveLegacyPutchar) {
> + for (Index = 0; Index < NumberOfBytes; Index++) {
> + SbiCall (SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, 1, Buffer[Index]);
Should there be a check for return value and return?
> + }
> +
> + return Index;
> + }
> +
> + /*
> + * Neither DBCN or legacy extension were present.
> + */
> + return NumberOfBytes;
Shouldn't this return 0?
> +}
> +
> +/**
> + Read data from serial device and save the datas in buffer.
> +
> + Reads NumberOfBytes data bytes from a serial device into the buffer
> + specified by Buffer. The number of bytes actually read is returned.
> + If the return value is less than NumberOfBytes, then the rest operation failed.
> + If Buffer is NULL, then ASSERT().
> + If NumberOfBytes is zero, then return 0.
> +
> + @param Buffer The pointer to the data buffer to store the data read from the serial device.
> + @param NumberOfBytes The number of bytes which will be read.
> +
> + @retval 0 Read data failed; No data is to be read.
> + @retval >0 The actual number of bytes read from serial device.
> +
> +**/
> +UINTN
> +EFIAPI
> +SerialPortRead (
> + OUT UINT8 *Buffer,
> + IN UINTN NumberOfBytes
> + )
> +{
> + UINTN Index = 0;
> +
> + while ((Index < NumberOfBytes) && SerialPortPoll ()) {
> + Buffer[Index++] = (UINT8)mLastGetChar;
> + mLastGetChar = -1;
> + }
> +
> + return Index;
> +}
> +
> +/**
> + Polls a serial device to see if there is any data waiting to be read.
> +
> + Polls a serial device to see if there is any data waiting to be read.
> + If there is data waiting to be read from the serial device, then TRUE is returned.
> + If there is no data waiting to be read from the serial device, then FALSE is returned.
> +
> + @retval TRUE Data is waiting to be read from the serial device.
> + @retval FALSE There is no data waiting to be read from the serial device.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +SerialPortPoll (
> + VOID
> + )
> +{
> + /*
> + * Careful. OpenSBI with HTIF console will return -1 followed by -2
> + * if there is no character received. So just check for values >= 0.
> + */
> +
> + if (mLastGetChar >= 0) {
> + return TRUE;
> + }
> +
> + if (mHaveDbcn) {
> + UINT8 Buffer;
> + SBI_RET Ret = SbiCall (
> + SBI_EXT_DBCN,
> + SBI_EXT_DBCN_READ,
> + 3,
> + 1,
> + ((UINTN)&Buffer),
> + 0
> + );
> + if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
> + (Ret.Value == 1))
> + {
> + mLastGetChar = Buffer;
> + }
> + } else if (mHaveLegacyGetchar) {
> + mLastGetChar = (INT64)SbiCall (SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0).Error;
Isn't it better to use SBI_RET?
> + }
> +
> + return mLastGetChar >= 0;
> +}
> +
> +/**
> + Sets the control bits on a serial device.
> +
> + @param Control Sets the bits of Control that are settable.
> +
> + @retval RETURN_SUCCESS The new control bits were set on the serial device.
> + @retval RETURN_UNSUPPORTED The serial device does not support this operation.
> + @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
> +
> +**/
> +RETURN_STATUS
> +EFIAPI
> +SerialPortSetControl (
> + IN UINT32 Control
> + )
> +{
> + return RETURN_SUCCESS;
> +}
> +
> +/**
> + Retrieve the status of the control bits on a serial device.
> +
> + @param Control A pointer to return the current control signals from the serial device.
> +
> + @retval RETURN_SUCCESS The control bits were read from the serial device.
> + @retval RETURN_UNSUPPORTED The serial device does not support this operation.
> + @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
> +
> +**/
> +RETURN_STATUS
> +EFIAPI
> +SerialPortGetControl (
> + OUT UINT32 *Control
> + )
> +{
> + *Control = 0;
> + return RETURN_SUCCESS;
> +}
> +
> +/**
> + Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
> + data bits, and stop bits on a serial device.
> +
> + @param BaudRate The requested baud rate. A BaudRate value of 0 will use the
> + device's default interface speed.
> + On output, the value actually set.
> + @param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the
> + serial interface. A ReceiveFifoDepth value of 0 will use
> + the device's default FIFO depth.
> + On output, the value actually set.
> + @param Timeout The requested time out for a single character in microseconds.
> + This timeout applies to both the transmit and receive side of the
> + interface. A Timeout value of 0 will use the device's default time
> + out value.
> + On output, the value actually set.
> + @param Parity The type of parity to use on this serial device. A Parity value of
> + DefaultParity will use the device's default parity value.
> + On output, the value actually set.
> + @param DataBits The number of data bits to use on the serial device. A DataBits
> + vaule of 0 will use the device's default data bit setting.
> + On output, the value actually set.
> + @param StopBits The number of stop bits to use on this serial device. A StopBits
> + value of DefaultStopBits will use the device's default number of
> + stop bits.
> + On output, the value actually set.
> +
> + @retval RETURN_SUCCESS The new attributes were set on the serial device.
> + @retval RETURN_UNSUPPORTED The serial device does not support this operation.
> + @retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value.
> + @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
> +
> +**/
> +RETURN_STATUS
> +EFIAPI
> +SerialPortSetAttributes (
> + IN OUT UINT64 *BaudRate,
> + IN OUT UINT32 *ReceiveFifoDepth,
> + IN OUT UINT32 *Timeout,
> + IN OUT EFI_PARITY_TYPE *Parity,
> + IN OUT UINT8 *DataBits,
> + IN OUT EFI_STOP_BITS_TYPE *StopBits
> + )
> +{
> + return RETURN_SUCCESS;
> +}
> diff --git a/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c
> new file mode 100644
> index 000000000000..0ad5931be3ae
> --- /dev/null
> +++ b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.c
> @@ -0,0 +1,233 @@
> +/** @file
> + Serial Port Library backed by SBI console.
> +
> + Meant for SEC and PEI (XIP) environments.
> +
> + Due to limitations of SBI console interface and XIP environments
> + (on use of globals), this library instance does not implement reading
> + and polling the serial port. See PrePiDxeSerialPortLibRiscVSbi for
> + the full-featured variant meant for PrePi and DXE environments.
> +
> + Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Base.h>
> +#include <Library/SerialPortLib.h>
> +#include <Library/BaseRiscVSbiLib.h>
> +
> +/**
> + Initialize the serial device hardware.
> +
> + If no initialization is required, then return RETURN_SUCCESS.
> + If the serial device was successfully initialized, then return RETURN_SUCCESS.
> + If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
> +
> + @retval RETURN_SUCCESS The serial device was initialized.
> + @retval RETURN_DEVICE_ERROR The serial device could not be initialized.
> +
> +**/
> +RETURN_STATUS
> +EFIAPI
> +SerialPortInitialize (
> + VOID
> + )
> +{
> + return RETURN_SUCCESS;
> +}
> +
> +/**
> + Write data from buffer to serial device.
> +
> + Writes NumberOfBytes data bytes from Buffer to the serial device.
> + The number of bytes actually written to the serial device is returned.
> + If the return value is less than NumberOfBytes, then the write operation failed.
> + If Buffer is NULL, then ASSERT().
> + If NumberOfBytes is zero, then return 0.
> +
> + @param Buffer The pointer to the data buffer to be written.
> + @param NumberOfBytes The number of bytes to written to the serial device.
> +
> + @retval 0 NumberOfBytes is 0.
> + @retval >0 The number of bytes written to the serial device.
> + If this value is less than NumberOfBytes, then the write operation failed.
> +
> +**/
> +UINTN
> +EFIAPI
> +SerialPortWrite (
> + IN UINT8 *Buffer,
> + IN UINTN NumberOfBytes
> + )
> +{
> + SBI_RET Ret;
> + UINTN Index;
> +
> + Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_DBCN);
> + if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
> + (Ret.Value != 0))
> + {
> + Ret = SbiCall (
> + SBI_EXT_DBCN,
> + SBI_EXT_DBCN_WRITE,
> + 3,
> + NumberOfBytes,
> + ((UINTN)Buffer),
> + 0
> + );
> + if (TranslateError (Ret.Error) != EFI_SUCCESS) {
> + return 0;
> + }
> +
> + return Ret.Value;
> + }
> +
> + Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_0_1_CONSOLE_PUTCHAR);
> + if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
> + (Ret.Value != 0))
> + {
> + for (Index = 0; Index < NumberOfBytes; Index++) {
> + SbiCall (SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, 1, Buffer[Index]);
Same as above. Should we check for return value?
> + }
> +
> + return Index;
> + }
> +
> + /*
> + * Neither DBCN or legacy extension were present.
> + */
> + return NumberOfBytes;
Failure to write should return 0 right?
> +}
> +
> +/**
> + Read data from serial device and save the datas in buffer.
> +
> + Reads NumberOfBytes data bytes from a serial device into the buffer
> + specified by Buffer. The number of bytes actually read is returned.
> + If the return value is less than NumberOfBytes, then the rest operation failed.
> + If Buffer is NULL, then ASSERT().
> + If NumberOfBytes is zero, then return 0.
> +
> + @param Buffer The pointer to the data buffer to store the data read from the serial device.
> + @param NumberOfBytes The number of bytes which will be read.
> +
> + @retval 0 Read data failed; No data is to be read.
> + @retval >0 The actual number of bytes read from serial device.
> +
> +**/
> +UINTN
> +EFIAPI
> +SerialPortRead (
> + OUT UINT8 *Buffer,
> + IN UINTN NumberOfBytes
> + )
> +{
> + return 0;
> +}
> +
> +/**
> + Polls a serial device to see if there is any data waiting to be read.
> +
> + Polls a serial device to see if there is any data waiting to be read.
> + If there is data waiting to be read from the serial device, then TRUE is returned.
> + If there is no data waiting to be read from the serial device, then FALSE is returned.
> +
> + @retval TRUE Data is waiting to be read from the serial device.
> + @retval FALSE There is no data waiting to be read from the serial device.
> +
> +**/
> +BOOLEAN
> +EFIAPI
> +SerialPortPoll (
> + VOID
> + )
> +{
> + return FALSE;
> +}
> +
> +/**
> + Sets the control bits on a serial device.
> +
> + @param Control Sets the bits of Control that are settable.
> +
> + @retval RETURN_SUCCESS The new control bits were set on the serial device.
> + @retval RETURN_UNSUPPORTED The serial device does not support this operation.
> + @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
> +
> +**/
> +RETURN_STATUS
> +EFIAPI
> +SerialPortSetControl (
> + IN UINT32 Control
> + )
> +{
> + return RETURN_SUCCESS;
> +}
> +
> +/**
> + Retrieve the status of the control bits on a serial device.
> +
> + @param Control A pointer to return the current control signals from the serial device.
> +
> + @retval RETURN_SUCCESS The control bits were read from the serial device.
> + @retval RETURN_UNSUPPORTED The serial device does not support this operation.
> + @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
> +
> +**/
> +RETURN_STATUS
> +EFIAPI
> +SerialPortGetControl (
> + OUT UINT32 *Control
> + )
> +{
> + *Control = 0;
> + return RETURN_SUCCESS;
> +}
> +
> +/**
> + Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
> + data bits, and stop bits on a serial device.
> +
> + @param BaudRate The requested baud rate. A BaudRate value of 0 will use the
> + device's default interface speed.
> + On output, the value actually set.
> + @param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the
> + serial interface. A ReceiveFifoDepth value of 0 will use
> + the device's default FIFO depth.
> + On output, the value actually set.
> + @param Timeout The requested time out for a single character in microseconds.
> + This timeout applies to both the transmit and receive side of the
> + interface. A Timeout value of 0 will use the device's default time
> + out value.
> + On output, the value actually set.
> + @param Parity The type of parity to use on this serial device. A Parity value of
> + DefaultParity will use the device's default parity value.
> + On output, the value actually set.
> + @param DataBits The number of data bits to use on the serial device. A DataBits
> + vaule of 0 will use the device's default data bit setting.
> + On output, the value actually set.
> + @param StopBits The number of stop bits to use on this serial device. A StopBits
> + value of DefaultStopBits will use the device's default number of
> + stop bits.
> + On output, the value actually set.
> +
> + @retval RETURN_SUCCESS The new attributes were set on the serial device.
> + @retval RETURN_UNSUPPORTED The serial device does not support this operation.
> + @retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value.
> + @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
> +
> +**/
> +RETURN_STATUS
> +EFIAPI
> +SerialPortSetAttributes (
> + IN OUT UINT64 *BaudRate,
> + IN OUT UINT32 *ReceiveFifoDepth,
> + IN OUT UINT32 *Timeout,
> + IN OUT EFI_PARITY_TYPE *Parity,
> + IN OUT UINT8 *DataBits,
> + IN OUT EFI_STOP_BITS_TYPE *StopBits
> + )
> +{
> + return RETURN_SUCCESS;
> +}
> diff --git a/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni
> new file mode 100644
> index 000000000000..7b22caa5a090
> --- /dev/null
> +++ b/MdePkg/Library/PrePiDxeRiscVSerialPortLibSbi/PrePiDxeRiscVSerialPortLibSbi.uni
> @@ -0,0 +1,16 @@
> +// /** @file
> +// Serial Port Library backed by SBI console.
> +//
> +// Serial Port Library backed by SBI console.
> +//
> +// Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
> +//
> +// SPDX-License-Identifier: BSD-2-Clause-Patent
> +//
> +// **/
> +
> +
> +#string STR_MODULE_ABSTRACT #language en-US "Serial Port Library backed by SBI console"
> +
> +#string STR_MODULE_DESCRIPTION #language en-US "Serial Port Library backed by SBI console."
> +
> diff --git a/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni
> new file mode 100644
> index 000000000000..7b22caa5a090
> --- /dev/null
> +++ b/MdePkg/Library/SecPeiRiscVSerialPortLibSbi/SecPeiRiscVSerialPortLibSbi.uni
> @@ -0,0 +1,16 @@
> +// /** @file
> +// Serial Port Library backed by SBI console.
> +//
> +// Serial Port Library backed by SBI console.
> +//
> +// Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
> +//
> +// SPDX-License-Identifier: BSD-2-Clause-Patent
> +//
> +// **/
> +
> +
> +#string STR_MODULE_ABSTRACT #language en-US "Serial Port Library backed by SBI console"
> +
> +#string STR_MODULE_DESCRIPTION #language en-US "Serial Port Library backed by SBI console."
> +
> --
> 2.25.1
>
Please update MdePkg.dsc for these new libraries. Also, we need ACK from
MdePkg maintainers.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2023-03-10 7:19 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-03-03 18:04 [edk2 0/3] v3 RISC-V SBI-backed SerialLib Andrei Warkentin
2023-03-03 18:04 ` [edk2 1/3] MdePkg: BaseRiscVSbiLib: make more useful to consumers Andrei Warkentin
2023-03-10 6:23 ` Sunil V L
2023-03-03 18:04 ` [edk2 2/3] [PATCH v3] MdePkg: add SBI-based SeriaPortLib for RISC-V Andrei Warkentin
2023-03-10 7:19 ` Sunil V L
2023-03-03 18:04 ` [edk2 3/3] OvmfPkg: RiscVVirt: Add missing SerialPortInitialize to Sec Andrei Warkentin
2023-03-10 6:26 ` [edk2-devel] " Sunil V L
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