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PcAtChipsetPkg/Rtc: Fix a UEFI Win7 boot hang issue

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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
This commit is contained in:
Ruiyu Ni
2015-12-22 13:52:47 +00:00
committed by niruiyu
parent 1b43162d70
commit 41628cbc7c
4 changed files with 158 additions and 4 deletions
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22
PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.h
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@@ -19,6 +19,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <Uefi.h>
#include <Guid/Acpi.h>
#include <Protocol/RealTimeClock.h>
#include <Library/BaseLib.h>
@@ -34,13 +36,15 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <Library/PcdLib.h>
#include <Library/ReportStatusCodeLib.h>
typedef struct {
EFI_LOCK RtcLock;
INT16 SavedTimeZone;
UINT8 Daylight;
UINT8 CenturyRtcAddress;
} PC_RTC_MODULE_GLOBALS;
extern PC_RTC_MODULE_GLOBALS mModuleGlobal;
#define PCAT_RTC_ADDRESS_REGISTER 0x70
#define PCAT_RTC_DATA_REGISTER 0x71
@@ -355,4 +359,20 @@ IsLeapYear (
IN EFI_TIME *Time
);
/**
Notification function of ACPI Table change.
This is a notification function registered on ACPI Table change event.
It saves the Century address stored in ACPI FADT table.
@param Event Event whose notification function is being invoked.
@param Context Pointer to the notification function's context.
**/
VOID
EFIAPI
PcRtcAcpiTableChangeCallback (
IN EFI_EVENT Event,
IN VOID *Context
);
#endif