From ba2300f97b1947d4ae927cee05f76791c417d707 Mon Sep 17 00:00:00 2001
From: Gua Guo <gua.guo@intel.com>
Date: Mon, 22 May 2023 10:07:24 +0800
Subject: PcAtChipsetPkg: RTC Runtime unable to get correct IO port by PCD

RTC runtime is unable to get dynamic PCD value after booting to
OS using runtime services.

Resolution: Cache the dynamic PCD value in RTC driver entry point

Cc: Ray Ni <ray.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Gua Guo <gua.guo@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
---
 PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c | 36 ++++++++++++----------
 .../PcatRealTimeClockRuntimeDxe/PcRtcEntry.c       | 14 +++++++--
 2 files changed, 31 insertions(+), 19 deletions(-)

diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
index d8b9fa8376..ff1b019ce2 100644
--- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
+++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
@@ -11,9 +11,11 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 
 #include "PcRtc.h"
 
-extern UINTN  mRtcIndexRegister;
-extern UINTN  mRtcTargetRegister;
-
+extern UINTN   mRtcIndexRegister;
+extern UINTN   mRtcTargetRegister;
+extern UINT16  mRtcDefaultYear;
+extern UINT16  mMinimalValidYear;
+extern UINT16  mMaximalValidYear;
 //
 // Days of month.
 //
@@ -72,10 +74,10 @@ IoRtcRead (
   )
 {
   IoWrite8 (
-    PcdGet8 (PcdRtcIndexRegister),
-    (UINT8)(Address | (UINT8)(IoRead8 (PcdGet8 (PcdRtcIndexRegister)) & 0x80))
+    mRtcIndexRegister,
+    (UINT8)(Address | (UINT8)(IoRead8 (mRtcIndexRegister) & 0x80))
     );
-  return IoRead8 (PcdGet8 (PcdRtcTargetRegister));
+  return IoRead8 (mRtcTargetRegister);
 }
 
 /**
@@ -94,10 +96,10 @@ IoRtcWrite (
   )
 {
   IoWrite8 (
-    PcdGet8 (PcdRtcIndexRegister),
-    (UINT8)(Address | (UINT8)(IoRead8 (PcdGet8 (PcdRtcIndexRegister)) & 0x80))
+    mRtcIndexRegister,
+    (UINT8)(Address | (UINT8)(IoRead8 (mRtcIndexRegister) & 0x80))
     );
-  IoWrite8 (PcdGet8 (PcdRtcTargetRegister), Data);
+  IoWrite8 (mRtcTargetRegister, Data);
 }
 
 /**
@@ -317,8 +319,8 @@ PcRtcInit (
     Time.Hour       = RTC_INIT_HOUR;
     Time.Day        = RTC_INIT_DAY;
     Time.Month      = RTC_INIT_MONTH;
-    Time.Year       = MAX (PcdGet16 (PcdRtcDefaultYear), PcdGet16 (PcdMinimalValidYear));
-    Time.Year       = MIN (Time.Year, PcdGet16 (PcdMaximalValidYear));
+    Time.Year       = MAX (mRtcDefaultYear, mMinimalValidYear);
+    Time.Year       = MIN (Time.Year, mMaximalValidYear);
     Time.Nanosecond = 0;
     Time.TimeZone   = EFI_UNSPECIFIED_TIMEZONE;
     Time.Daylight   = 0;
@@ -358,8 +360,8 @@ PcRtcInit (
   Time.Hour       = RTC_INIT_HOUR;
   Time.Day        = RTC_INIT_DAY;
   Time.Month      = RTC_INIT_MONTH;
-  Time.Year       = MAX (PcdGet16 (PcdRtcDefaultYear), PcdGet16 (PcdMinimalValidYear));
-  Time.Year       = MIN (Time.Year, PcdGet16 (PcdMaximalValidYear));
+  Time.Year       = MAX (mRtcDefaultYear, mMinimalValidYear);
+  Time.Year       = MIN (Time.Year, mMaximalValidYear);
   Time.Nanosecond = 0;
   Time.TimeZone   = Global->SavedTimeZone;
   Time.Daylight   = Global->Daylight;
@@ -1031,8 +1033,8 @@ ConvertRtcTimeToEfiTime (
   //   Century is 19 if RTC year >= 70,
   //   Century is 20 otherwise.
   //
-  Century = (UINT8)(PcdGet16 (PcdMinimalValidYear) / 100);
-  if (Time->Year < PcdGet16 (PcdMinimalValidYear) % 100) {
+  Century = (UINT8)(mMinimalValidYear / 100);
+  if (Time->Year < mMinimalValidYear % 100) {
     Century++;
   }
 
@@ -1114,8 +1116,8 @@ RtcTimeFieldsValid (
   IN EFI_TIME  *Time
   )
 {
-  if ((Time->Year < PcdGet16 (PcdMinimalValidYear)) ||
-      (Time->Year > PcdGet16 (PcdMaximalValidYear)) ||
+  if ((Time->Year < mMinimalValidYear) ||
+      (Time->Year > mMaximalValidYear) ||
       (Time->Month < 1) ||
       (Time->Month > 12) ||
       (!DayValid (Time)) ||
diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c
index e6e9458d75..b600df4879 100644
--- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c
+++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtcEntry.c
@@ -16,8 +16,11 @@ EFI_HANDLE  mHandle = NULL;
 
 STATIC EFI_EVENT  mVirtualAddrChangeEvent;
 
-UINTN  mRtcIndexRegister;
-UINTN  mRtcTargetRegister;
+UINTN   mRtcIndexRegister;
+UINTN   mRtcTargetRegister;
+UINT16  mRtcDefaultYear;
+UINT16  mMinimalValidYear;
+UINT16  mMaximalValidYear;
 
 /**
   Returns the current time and date information, and the time-keeping capabilities
@@ -164,8 +167,15 @@ InitializePcRtc (
   if (FeaturePcdGet (PcdRtcUseMmio)) {
     mRtcIndexRegister  = (UINTN)PcdGet64 (PcdRtcIndexRegister64);
     mRtcTargetRegister = (UINTN)PcdGet64 (PcdRtcTargetRegister64);
+  } else {
+    mRtcIndexRegister  = (UINTN)PcdGet8 (PcdRtcIndexRegister);
+    mRtcTargetRegister = (UINTN)PcdGet8 (PcdRtcTargetRegister);
   }
 
+  mRtcDefaultYear   = PcdGet16 (PcdRtcDefaultYear);
+  mMinimalValidYear = PcdGet16 (PcdMinimalValidYear);
+  mMaximalValidYear = PcdGet16 (PcdMaximalValidYear);
+
   Status = PcRtcInit (&mModuleGlobal);
   ASSERT_EFI_ERROR (Status);
 
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