PcAtChipsetPkg/Rtc: Fix a UEFI Win7 boot hang issue

The patch updates the Century value in CMOS location specified
by FADT.Century to avoid UEFI Win7 hang during booting.
Per the ACPI spec if the FADT.Century is zero, it's not needed
to store the century value in CMOS. But UEFI Win7 treats the
Century storage is optional only when FADT.Century is 0x80.
While Linux strictly follows the ACPI spec and treats Century
storage is optional when FADT.Century is 0.
So if a platform wants to support both UEFI Win7 and Linux,
it needs to report FADT.Century to a traditional value which
doesn't equal to 0 or 0x80 (0x32 mostly). And RTC driver is
enhanced to save the century value to the location specified
by FADT.Century.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19442 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 23 insertions, 3 deletions

diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c
index 9cf3988705..6f2a987f22 100644
--- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c
+++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c
@@ -1,7 +1,7 @@
 /** @file

   Provides Set/Get time operations.

 

-Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>

 This program and the accompanying materials

 are licensed and made available under the terms and conditions of the BSD License

 which accompanies this distribution.  The full text of the license may be found at

@@ -14,11 +14,10 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 

 #include "PcRtc.h"

 

-PC_RTC_MODULE_GLOBALS  mModuleGlobal;

+PC_RTC_MODULE_GLOBALS  mModuleGlobal = { 0 };

 

 EFI_HANDLE             mHandle = NULL;

 

-

 /**

   Returns the current time and date information, and the time-keeping capabilities

   of the hardware platform.

@@ -133,11 +132,32 @@ InitializePcRtc (
   )

 {

   EFI_STATUS  Status;

+  EFI_EVENT   Event;

 

   EfiInitializeLock (&mModuleGlobal.RtcLock, TPL_CALLBACK);

 

   Status = PcRtcInit (&mModuleGlobal);

   ASSERT_EFI_ERROR (Status);

+  

+  Status = gBS->CreateEventEx (

+                  EVT_NOTIFY_SIGNAL,

+                  TPL_CALLBACK,

+                  PcRtcAcpiTableChangeCallback,

+                  NULL,

+                  &gEfiAcpi10TableGuid,

+                  &Event

+                  );

+  ASSERT_EFI_ERROR (Status);

+  

+  Status = gBS->CreateEventEx (

+                  EVT_NOTIFY_SIGNAL,

+                  TPL_CALLBACK,

+                  PcRtcAcpiTableChangeCallback,

+                  NULL,

+                  &gEfiAcpiTableGuid,

+                  &Event

+                  );

+  ASSERT_EFI_ERROR (Status);

 

   gRT->GetTime       = PcRtcEfiGetTime;

   gRT->SetTime       = PcRtcEfiSetTime;