Hi Laszlo,
This change is look good to me and I will take
this change into edk2/OvmfPkg/LoongArchVirt/ which I'm porting.
Thanks.
Reviewed-by: Chao Li <lichao@loongson.cn>
RealTimeClockLib instances are consumed by edk2's EmbeddedPkg/RealTimeClockRuntimeDxe driver. In its entry point function InitializeRealTimeClock(), the driver: (1) calls LibRtcInitialize(), (2) sets the GetTime(), SetTime(), GetWakeupTime() and SetWakeupTime() runtime services to its own similarly-named functions -- where those functions wrap the corresponding RealTimeClockLib APIs, (3) installs EFI_REAL_TIME_CLOCK_ARCH_PROTOCOL with a NULL protocol interface. Steps (2) and (3) conform to PI v1.8 sections II-9.7.2.4 through II-9.7.2.7. However, this means that LibRtcInitialize() (of any RealTimeClockLib instance) should not itself (a) set the GetTime(), SetTime(), GetWakeupTime() and SetWakeupTime() runtime services, nor (b) install EFI_REAL_TIME_CLOCK_ARCH_PROTOCOL. The runtime service pointers will be overwritten in step (2) anyway, and step (3) will uselessly install a second (NULL-interface) EFI_REAL_TIME_CLOCK_ARCH_PROTOCOL instance in the protocol database. (The protocol only serves to notify the DXE Foundation about said runtime services being available.) Clean up LoongArchQemuPkg/LsRealTimeClockLib accordingly. (Note that the lib instance INF file already does not list UefiRuntimeServicesTableLib.) Build-tested only (with "Loongson.dsc"). Cc: Bibo Mao <maobibo@loongson.cn> Cc: Chao Li <lichao@loongson.cn> Cc: Xianglai li <lixianglai@loongson.cn> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=4565 Signed-off-by: Laszlo Ersek <lersek@redhat.com> --- Notes: context:-W Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.inf | 3 --- Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.c | 16 ---------------- 2 files changed, 19 deletions(-) diff --git a/Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.inf b/Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.inf index 5aa95650f8ba..c5ab1a702167 100644 --- a/Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.inf +++ b/Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.inf @@ -40,8 +40,5 @@ [Pcd] [Guids] gEfiEventVirtualAddressChangeGuid -[Protocols] - gEfiRealTimeClockArchProtocolGuid # PROTOCOL ALWAYS_PRODUCED - [Depex] TRUE diff --git a/Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.c b/Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.c index eeac011a9400..954589ecb328 100644 --- a/Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.c +++ b/Platform/Loongson/LoongArchQemuPkg/Library/LsRealTimeClockLib/LsRealTimeClockLib.c @@ -1,30 +1,28 @@ /** @file Implement EFI RealTimeClock runtime services via RTC Lib. Copyright (c) 2022, Loongson Limited. All rights reserved. SPDX-License-Identifier: BSD-2-Clause-Patent **/ #include <Uefi.h> #include <PiDxe.h> #include <Guid/EventGroup.h> #include <Guid/GlobalVariable.h> #include <Library/BaseLib.h> #include <Library/DebugLib.h> #include <Library/DxeServicesTableLib.h> #include <Library/IoLib.h> #include <Library/MemoryAllocationLib.h> #include <Library/PcdLib.h> #include <Library/RealTimeClockLib.h> #include <Library/TimeBaseLib.h> #include <Library/UefiBootServicesTableLib.h> -#include <Library/UefiRuntimeServicesTableLib.h> #include <Library/UefiRuntimeLib.h> -#include <Protocol/RealTimeClock.h> #include "LsRealTimeClock.h" STATIC BOOLEAN mInitialized = FALSE; @@ -291,46 +289,32 @@ EFIAPI LibRtcInitialize ( IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable ) { EFI_STATUS Status; - EFI_HANDLE Handle; InitRtc (); Status = KvmtoolRtcMapMemory (ImageHandle, (mRtcBase & ~EFI_PAGE_MASK)); if (EFI_ERROR (Status)) { DEBUG (( DEBUG_ERROR, "Failed to map memory for loongson 7A RTC. Status = %r\n", Status )); return Status; } - // Setup the setters and getters - gRT->GetTime = LibGetTime; - gRT->SetTime = LibSetTime; - - // Install the protocol - Handle = NULL; - Status = gBS->InstallMultipleProtocolInterfaces ( - &Handle, - &gEfiRealTimeClockArchProtocolGuid, NULL, - NULL - ); - ASSERT_EFI_ERROR (Status); - // // Register for the virtual address change event // Status = gBS->CreateEventEx ( EVT_NOTIFY_SIGNAL, TPL_NOTIFY, VirtualNotifyEvent, NULL, &gEfiEventVirtualAddressChangeGuid, &mRtcVirtualAddrChangeEvent ); ASSERT_EFI_ERROR (Status); return Status; }