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 <[email protected]>
Cc: Chao Li <[email protected]>
Cc: Xianglai li <[email protected]>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=4565
Signed-off-by: Laszlo Ersek <[email protected]>
---
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;
}
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