From ec35e997ad836c2ac95ae5c43f2e8f883062081e Mon Sep 17 00:00:00 2001
From: lgao4 <lgao4@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Tue, 6 May 2008 05:38:06 +0000
Subject: [PATCH] Enable storage of daylight saving and time zone data of
 SetTime() service, and fix bug of SetWakeupTime() service.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5168 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../PcatRealTimeClockRuntimeDxe/PcRtc.c       | 39 ++++++++++++++++++-
 .../PcatRealTimeClockRuntimeDxe/PcRtc.h       |  3 +-
 .../PcatRealTimeClockRuntimeDxe.inf           |  7 +++-
 3 files changed, 45 insertions(+), 4 deletions(-)

diff --git a/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.c b/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.c
index f97a2b7e7b..a007bd0595 100644
--- a/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.c
+++ b/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.c
@@ -107,6 +107,8 @@ Returns:
   RTC_REGISTER_D  RegisterD;
   UINT8           Century;
   EFI_TIME        Time;
+  UINTN           DataSize;
+  UINT32          TimerVar;
 
   //
   // Acquire RTC Lock to make access to RTC atomic
@@ -175,8 +177,9 @@ Returns:
 
   //
   // Set RTC configuration after get original time
+  // The value of bit AIE should be reserved.
   //
-  RtcWrite (RTC_ADDRESS_REGISTER_B, RTC_INIT_REGISTER_B);
+  RtcWrite (RTC_ADDRESS_REGISTER_B, RTC_INIT_REGISTER_B | (RegisterB.Data & BIT5));
 
   //
   // Release RTC Lock.
@@ -199,6 +202,25 @@ Returns:
     Time.Year   = RTC_INIT_YEAR;
   }
   //
+  // Get the data of Daylight saving and time zone, if they have been
+  // stored in NV variable during previous boot.
+  //
+  DataSize = sizeof (UINT32);
+  Status = EfiGetVariable (
+             L"TimerVar",
+             &gEfiGenericPlatformVariableGuid,
+             NULL,
+             &DataSize,
+             (VOID *) &TimerVar
+             );
+  if (!EFI_ERROR (Status)) {
+    Global->SavedTimeZone = (INT16) TimerVar;
+    Global->Daylight      = (UINT8) (TimerVar >> 16);
+
+    Time.TimeZone = Global->SavedTimeZone;
+    Time.Daylight = Global->Daylight;
+  }
+  //
   // Reset time value according to new RTC configuration
   //
   PcRtcSetTime (&Time, Global);
@@ -343,6 +365,7 @@ Routine Description:
   EFI_TIME        RtcTime;
   RTC_REGISTER_B  RegisterB;
   UINT8           Century;
+  UINT32          TimerVar;
 
   if (Time == NULL) {
     return EFI_INVALID_PARAMETER;
@@ -417,7 +440,19 @@ Routine Description:
   //
   Global->SavedTimeZone = Time->TimeZone;
   Global->Daylight      = Time->Daylight;
-  return Status;
+
+  TimerVar = Time->Daylight;
+  TimerVar = (UINT32) ((TimerVar << 16) | Time->TimeZone);
+  Status =  EfiSetVariable (
+              L"TimerVar",
+              &gEfiGenericPlatformVariableGuid,
+              EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
+              sizeof (TimerVar),
+              &TimerVar
+              );
+  ASSERT_EFI_ERROR (Status);
+
+  return EFI_SUCCESS;
 }
 
 EFI_STATUS
diff --git a/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.h b/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.h
index b120d09819..c44731a2f8 100644
--- a/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.h
+++ b/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.h
@@ -20,6 +20,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <PiDxe.h>
 
 #include <Protocol/RealTimeClock.h>
+#include <Guid/GenericPlatformVariable.h>
 
 #include <Library/BaseLib.h>
 #include <Library/DebugLib.h>
@@ -35,7 +36,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 typedef struct {
   EFI_LOCK  RtcLock;
-  UINT16    SavedTimeZone;
+  INT16     SavedTimeZone;
   UINT8     Daylight;
 } PC_RTC_MODULE_GLOBALS;
 
diff --git a/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf b/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf
index d50129fd52..f464369bd1 100644
--- a/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf
+++ b/MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf
@@ -40,6 +40,7 @@
 
 [Packages]
   MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
 
 [LibraryClasses]
   UefiRuntimeServicesTableLib
@@ -53,8 +54,12 @@
   DebugLib
   BaseLib
 
+[Guids]
+  gEfiGenericPlatformVariableGuid               # ALWAYS_CONSUMED
+
 [Protocols]
   gEfiRealTimeClockArchProtocolGuid             # PROTOCOL ALWAYS_PRODUCED
 
 [Depex]
-  TRUE
\ No newline at end of file
+  gEfiVariableArchProtocolGuid AND gEfiVariableWriteArchProtocolGuid
+  
\ No newline at end of file