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 FT2000-4Pkg/RealTimeClockLib accordingly (it only has code that's
redundant for step (3); it does not try to set "gRT" fields).

(Note that the lib instance INF file already does not list
gEfiRealTimeClockArchProtocolGuid.)

Build-tested only (with "DurianPkg.dsc").

Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ling Jia <jialing@phytium.com.cn>
Cc: Peng Xie <xiepeng@phytium.com.cn>
Cc: Yiqi Shu <shuyiqi@phytium.com.cn>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=4565
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
 Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.c b/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.c
index 5c3d0cdccff8..26fbd7a3552a 100644
--- a/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.c
+++ b/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.c
@@ -15,7 +15,6 @@
 #include <Library/TimeBaseLib.h>
 #include <Library/UefiBootServicesTableLib.h>
 #include <Library/UefiRuntimeLib.h>
-#include <Protocol/RealTimeClock.h>
 #include "RealTimeClockLib.h"
 
 STATIC EFI_EVENT    mRtcVirtualAddrChangeEvent;
@@ -344,7 +343,6 @@ LibRtcInitialize (
   )
 {
   EFI_STATUS    Status;
-  EFI_HANDLE      Handle;
   INT16         TimeZone;
   UINTN         Size;
   EFI_TIME    Time;
@@ -437,17 +435,6 @@ LibRtcInitialize (
     return Status;
   }
   //
-  // 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 (



-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#109842): https://edk2.groups.io/g/devel/message/109842
Mute This Topic: https://groups.io/mt/102079661/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/leave/3901457/1787277/102458076/xyzzy [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-