From e38ab18a49ed010c79d14dd21bf4dff5e062dbb1 Mon Sep 17 00:00:00 2001
From: Ruiyu Ni <ruiyu.ni@intel.com>
Date: Wed, 18 May 2016 13:18:28 +0800
Subject: PcAtChipsetPkg/PcRtc: get century RTC address in entry point

When ACPI table is installed before PcRtc driver runs,
the ACPI table installation callback isn't called which causes the
century value isn't written to the CMOS.
The patch calls GetCenturyRtcAddress() in entry point to fix
the bug.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Anbazhagan Baraneedharan <anbazhagan@hp.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Cc: Star Zeng <star.zeng@intel.com>
---
 PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.h      | 12 +++++++++++-
 PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c |  4 ++--
 2 files changed, 13 insertions(+), 3 deletions(-)

(limited to 'PcAtChipsetPkg')

diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.h b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.h
index 7fc19f9043..ba6092de45 100644
--- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.h
+++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.h
@@ -1,7 +1,7 @@
 /** @file
   Header file for real time clock driver.
 
-Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2016, 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
@@ -359,6 +359,16 @@ IsLeapYear (
   IN EFI_TIME   *Time
   );
 
+/**
+  Get the century RTC address from the ACPI FADT table.
+
+  @return  The century RTC address or 0 if not found.
+**/
+UINT8
+GetCenturyRtcAddress (
+  VOID
+  );
+
 /**
   Notification function of ACPI Table change.
 
diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c
index 1cfb0cb198..a61a35e9ee 100644
--- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c
+++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c
@@ -1,7 +1,7 @@
 /** @file
   Provides Set/Get time operations.
 
-Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2016, 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
@@ -135,7 +135,7 @@ InitializePcRtc (
   EFI_EVENT   Event;
 
   EfiInitializeLock (&mModuleGlobal.RtcLock, TPL_CALLBACK);
-  mModuleGlobal.CenturyRtcAddress = 0;
+  mModuleGlobal.CenturyRtcAddress = GetCenturyRtcAddress ();
 
   Status = PcRtcInit (&mModuleGlobal);
   ASSERT_EFI_ERROR (Status);
-- 
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