[PATCH v3 45/46] Silicon/Phytium: Added Rtc driver to FT2000/4

[Ling Jia <jialing@phytium.com.cn>]

The RealTimeClockLib implemented EFI RealTimeClock
runtime services via RTC Lib.

v3:
Optimized the codes to conform to specifications.

Signed-off-by: Ling Jia <jialing@phytium.com.cn>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>
---
 Silicon/Phytium/PhytiumCommonPkg/PhytiumCommonPkg.dec                     |   1 +
 Platform/Phytium/DurianPkg/DurianPkg.dsc                                  |   6 +
 Platform/Phytium/DurianPkg/DurianPkg.fdf                                  |   2 +
 Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.inf |  39 ++
 Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.h   |  24 +
 Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.c   | 462 ++++++++++++++++++++
 6 files changed, 534 insertions(+)

diff --git a/Silicon/Phytium/PhytiumCommonPkg/PhytiumCommonPkg.dec b/Silicon/Phytium/PhytiumCommonPkg/PhytiumCommonPkg.dec
index 2686ba3cc3a2..4c6c5c5f1118 100644
--- a/Silicon/Phytium/PhytiumCommonPkg/PhytiumCommonPkg.dec
+++ b/Silicon/Phytium/PhytiumCommonPkg/PhytiumCommonPkg.dec
@@ -45,6 +45,7 @@ [PcdsFixedAtBuild.common]
   gPhytiumPlatformTokenSpaceGuid.PcdSpiFlashSize|0x0|UINT64|0x00000005
   gPhytiumPlatformTokenSpaceGuid.PcdSpiControllerBase|0x0|UINT64|0x00000006
   gPhytiumPlatformTokenSpaceGuid.PcdSpiControllerSize|0x0|UINT64|0x00000007
+  gPhytiumPlatformTokenSpaceGuid.PcdRtcBaseAddress|0x0|UINT32|0x00000008
 
 [Protocols]
   gSpiMasterProtocolGuid = { 0xdf093560, 0xf955, 0x11ea, { 0x96, 0x42, 0x43, 0x9d, 0x80, 0xdd, 0x0b, 0x7c}}
diff --git a/Platform/Phytium/DurianPkg/DurianPkg.dsc b/Platform/Phytium/DurianPkg/DurianPkg.dsc
index 99034365d38f..9579f8e9b7d0 100644
--- a/Platform/Phytium/DurianPkg/DurianPkg.dsc
+++ b/Platform/Phytium/DurianPkg/DurianPkg.dsc
@@ -29,6 +29,10 @@ [LibraryClasses.common]
   # Phytium Platform library
   ArmPlatformLib|Silicon/Phytium/FT2000-4Pkg/Library/PlatformLib/PlatformLib.inf
 
+  #FT2000-4Pkg RTC Driver
+  RealTimeClockLib|Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.inf
+  TimeBaseLib|EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.inf
+
   # PL011 UART Driver and Dependency Libraries
   SerialPortLib|ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.inf
   PL011UartClockLib|ArmPlatformPkg/Library/PL011UartClockLib/PL011UartClockLib.inf
@@ -168,6 +172,8 @@ [Components.common]
       NULL|MdeModulePkg/Library/VarCheckUefiLib/VarCheckUefiLib.inf
   }
   MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteDxe.inf
+  EmbeddedPkg/ResetRuntimeDxe/ResetRuntimeDxe.inf
+  EmbeddedPkg/RealTimeClockRuntimeDxe/RealTimeClockRuntimeDxe.inf
 
   #
   # Common Arm Timer and Gic Components
diff --git a/Platform/Phytium/DurianPkg/DurianPkg.fdf b/Platform/Phytium/DurianPkg/DurianPkg.fdf
index 67458458ddd5..242f647ca1b1 100644
--- a/Platform/Phytium/DurianPkg/DurianPkg.fdf
+++ b/Platform/Phytium/DurianPkg/DurianPkg.fdf
@@ -93,6 +93,8 @@ [FV.FvMain]
   #
   INF MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf
   INF MdeModulePkg/Universal/SecurityStubDxe/SecurityStubDxe.inf
+  INF EmbeddedPkg/RealTimeClockRuntimeDxe/RealTimeClockRuntimeDxe.inf
+  INF EmbeddedPkg/ResetRuntimeDxe/ResetRuntimeDxe.inf
   INF EmbeddedPkg/MetronomeDxe/MetronomeDxe.inf
 
   INF Silicon/Phytium/FT2000-4Pkg/Drivers/SpiDxe/SpiDxe.inf
diff --git a/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.inf b/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.inf
new file mode 100644
index 000000000000..09a06d53aef7
--- /dev/null
+++ b/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.inf
@@ -0,0 +1,39 @@
+#/** @file
+#  Phytium RealTime Clock Library file.
+#
+#  Copyright (C) 2020, Phytium Technology Co, Ltd. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x0001001b
+  BASE_NAME                      = RealTimeClockLib
+  FILE_GUID                      = fb320c94-40fe-11eb-b990-171865af292c
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = RealTimeClockLib
+
+[Sources.common]
+  RealTimeClockLib.c
+  RealTimeClockLib.h
+
+[Packages]
+  ArmPlatformPkg/ArmPlatformPkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdePkg/MdePkg.dec
+  Silicon/Phytium/PhytiumCommonPkg/PhytiumCommonPkg.dec
+
+[LibraryClasses]
+  DebugLib
+  DxeServicesTableLib
+  IoLib
+  TimeBaseLib
+  UefiRuntimeLib
+
+[Guids]
+  gEfiEventVirtualAddressChangeGuid
+
+[Pcd]
+  gPhytiumPlatformTokenSpaceGuid.PcdRtcBaseAddress
diff --git a/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.h b/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.h
new file mode 100644
index 000000000000..41ce002dc3be
--- /dev/null
+++ b/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.h
@@ -0,0 +1,24 @@
+/** @file
+  Phytium RealTime Clock Header.
+
+  Copyright (C) 2020, Phytium Technology Co Ltd. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef REAL_TIME_CLOCK_H_
+#define REAL_TIME_CLOCK_H_
+
+#define RTC_CMR       0x4
+#define RTC_AES_SEL   0x8
+#define RTC_CCR       0xC
+#define RTC_STAT      0x10
+#define RTC_RSTAT     0x14
+#define RTC_EOI       0x18
+#define RTC_CDR_LOW   0x20
+#define RTC_CCVR      0x24
+#define RTC_CLR_LOW   0x28
+#define RTC_CLR       0x2C
+
+#endif // REAL_TIME_CLOCK_H_
diff --git a/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.c b/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.c
new file mode 100644
index 000000000000..bf3047fb6795
--- /dev/null
+++ b/Silicon/Phytium/FT2000-4Pkg/Library/RealTimeClockLib/RealTimeClockLib.c
@@ -0,0 +1,462 @@
+/** @file
+  Implement EFI RealTimeClock runtime services via RTC Lib.
+
+  Copyright (C) 2020, Phytium Technology Co Ltd. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+
+#include <Library/DebugLib.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/IoLib.h>
+#include <Library/TimeBaseLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeLib.h>
+#include <Protocol/RealTimeClock.h>
+#include "RealTimeClockLib.h"
+
+STATIC EFI_EVENT    mRtcVirtualAddrChangeEvent;
+STATIC UINTN        mRtcBase;
+STATIC CONST CHAR16   mTimeZoneVariableName[] = L"RtcTimeZone";
+STATIC CONST CHAR16   mDaylightVariableName[] = L"RtcDaylight";
+
+/**
+  Returns the current time and date information, and the time-keeping capabilities
+  of the hardware platform.
+
+  @param  Time                   A pointer to storage to receive a snapshot of the current time.
+  @param  Capabilities           An optional pointer to a buffer to receive the real time clock
+                                 device's capabilities.
+
+  @retval EFI_SUCCESS            The operation completed successfully.
+  @retval EFI_INVALID_PARAMETER  Time is NULL.
+  @retval EFI_DEVICE_ERROR       The time could not be retrieved due to hardware error.
+  @retval EFI_SECURITY_VIOLATION The time could not be retrieved due to an authentication failure.
+
+**/
+EFI_STATUS
+EFIAPI
+LibGetTime (
+  OUT EFI_TIME                *Time,
+  OUT EFI_TIME_CAPABILITIES   *Capabilities
+  )
+{
+  UINT32      EpochSeconds;
+  INT16       TimeZone;
+  UINT8       Daylight;
+  UINTN       Size;
+  EFI_STATUS  Status;
+
+  // Ensure Time is a valid pointer
+  if (Time == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  MmioWrite32 (mRtcBase + RTC_AES_SEL, 0x100);
+  //
+  //read cdr high 32bit
+  //
+  EpochSeconds = MmioRead32 (mRtcBase + RTC_CCVR);
+  MmioRead32 (mRtcBase + RTC_CDR_LOW);
+  //
+  // Get the current time zone information from non-volatile storage
+  //
+  Size = sizeof (TimeZone);
+  Status = EfiGetVariable (
+      (CHAR16 *)mTimeZoneVariableName,
+      &gEfiCallerIdGuid,
+      NULL,
+      &Size,
+      (VOID *)&TimeZone
+      );
+
+  if (EFI_ERROR (Status)) {
+    ASSERT (Status != EFI_INVALID_PARAMETER);
+    ASSERT (Status != EFI_BUFFER_TOO_SMALL);
+    //
+    // The time zone variable does not exist in non-volatile storage, so create it.
+    //UTC+8:00
+    //
+    Time->TimeZone = -480;
+    //
+    // Store it
+    //
+    Status = EfiSetVariable (
+        (CHAR16 *)mTimeZoneVariableName,
+        &gEfiCallerIdGuid,
+        EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+        Size,
+        (VOID *)&(Time->TimeZone)
+        );
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+  } else {
+    //
+    // Got the time zone
+    //
+    Time->TimeZone = TimeZone;
+    //
+    // Check TimeZone bounds: -1440 to 1440 or 2047
+    //
+    if (((Time->TimeZone < -1440) || (Time->TimeZone > 1440))
+      && (Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE)) {
+      Time->TimeZone = EFI_UNSPECIFIED_TIMEZONE;
+    }
+    //
+    // Adjust for the correct time zone
+    //
+    if (Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE) {
+      EpochSeconds -= Time->TimeZone * SEC_PER_MIN;
+    }
+  }
+  //
+  // Get the current daylight information from non-volatile storage
+  //
+  Size = sizeof (Daylight);
+  Status = EfiGetVariable (
+      (CHAR16 *)mDaylightVariableName,
+      &gEfiCallerIdGuid,
+      NULL,
+      &Size,
+      (VOID *)&Daylight
+      );
+
+  if (EFI_ERROR (Status)) {
+    ASSERT (Status != EFI_INVALID_PARAMETER);
+    ASSERT (Status != EFI_BUFFER_TOO_SMALL);
+    //
+    // The daylight variable does not exist in non-volatile storage, so create it.
+    //
+    Time->Daylight = 0;
+    //
+    // Store it
+    //
+    Status = EfiSetVariable (
+        (CHAR16 *)mDaylightVariableName,
+        &gEfiCallerIdGuid,
+        EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+        Size,
+        (VOID *)&(Time->Daylight)
+        );
+
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+  } else {
+    //
+    // Got the daylight information
+    //
+    Time->Daylight = Daylight;
+    //
+    // Adjust for the correct period
+    //
+    if ((Time->Daylight & EFI_TIME_IN_DAYLIGHT) == EFI_TIME_IN_DAYLIGHT) {
+      //
+      // Convert to adjusted time, i.e. spring forwards one hour
+      //
+      EpochSeconds += SEC_PER_HOUR;
+    }
+  }
+
+  //
+  // Convert from internal 32-bit time to UEFI time
+  //
+  EpochToEfiTime (EpochSeconds, Time);
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Sets the current local time and date information.
+
+  @param[in]  Time                  A pointer to the current time.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+  @retval EFI_INVALID_PARAMETER A time field is out of range.
+  @retval EFI_DEVICE_ERROR      The time could not be set due due to hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+LibSetTime (
+  IN  EFI_TIME                *Time
+  )
+{
+  UINTN    EpochSeconds;
+  EFI_STATUS  Status;
+  //
+  // the maximum time span is just over 136 years.
+  // Time is stored in Unix Epoch format, so it starts in 1970,
+  // Therefore it can not exceed the year 2106.
+  //
+  if ((Time->Year < 1970) || (Time->Year >= 2106)) {
+    return EFI_UNSUPPORTED;
+  }
+  EpochSeconds = EfiTimeToEpoch (Time);
+  //
+  // Adjust for the correct time zone, i.e. convert to UTC time zone
+  //
+  if (Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE) {
+    EpochSeconds += Time->TimeZone * SEC_PER_MIN;
+  }
+  //
+  // Adjust for the correct period
+  //
+  if (((Time->Daylight & EFI_TIME_IN_DAYLIGHT) == EFI_TIME_IN_DAYLIGHT)
+    && (EpochSeconds > SEC_PER_HOUR)) {
+    //
+    // Convert to un-adjusted time, i.e. fall back one hour
+    //
+    EpochSeconds -= SEC_PER_HOUR;
+  }
+  //
+  // Set the Rtc
+  //
+  MmioWrite32 (mRtcBase + RTC_AES_SEL, 0x100);
+  MmioWrite32 (mRtcBase + RTC_CLR_LOW, 0x0);
+  MmioWrite32 (mRtcBase + RTC_CLR, (UINT32)EpochSeconds);
+  //
+  // Save the current time zone information into non-volatile storage
+  //
+  Status = EfiSetVariable (
+      (CHAR16 *)mTimeZoneVariableName,
+      &gEfiCallerIdGuid,
+      EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+      sizeof (Time->TimeZone),
+      (VOID *)&(Time->TimeZone)
+      );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+  //
+  // Save the current daylight information into non-volatile storage
+  //
+  Status = EfiSetVariable (
+      (CHAR16 *)mDaylightVariableName,
+      &gEfiCallerIdGuid,
+      EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+      sizeof (Time->Daylight),
+      (VOID *)&(Time->Daylight)
+      );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Returns the current wakeup alarm clock setting.
+
+  @param[out]  Enabled               Indicates if the alarm is currently enabled or disabled.
+  @param[out]  Pending               Indicates if the alarm signal is pending and requires acknowledgement.
+  @param[out]  Time                  The current alarm setting.
+
+  @retval      EFI_SUCCESS           The alarm settings were returned.
+  @retval      EFI_INVALID_PARAMETER Any parameter is NULL.
+  @retval      EFI_DEVICE_ERROR      The wakeup time could not be retrieved due to a hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+LibGetWakeupTime (
+  OUT BOOLEAN     *Enabled,
+  OUT BOOLEAN     *Pending,
+  OUT EFI_TIME    *Time
+  )
+{
+  // Not a required feature
+  return EFI_UNSUPPORTED;
+}
+
+
+/**
+  Sets the system wakeup alarm clock time.
+
+  @param[in]   Enabled               Enable or disable the wakeup alarm.
+  @param[out]  Time                  If Enable is TRUE, the time to set the wakeup alarm for.
+
+  @retval      EFI_SUCCESS           If Enable is TRUE, then the wakeup alarm was enabled. If
+                                     Enable is FALSE, then the wakeup alarm was disabled.
+  @retval      EFI_INVALID_PARAMETER A time field is out of range.
+  @retval      EFI_DEVICE_ERROR      The wakeup time could not be set due to a hardware error.
+  @retval      EFI_UNSUPPORTED       A wakeup timer is not supported on this platform.
+
+**/
+EFI_STATUS
+EFIAPI
+LibSetWakeupTime (
+  IN BOOLEAN      Enabled,
+  OUT EFI_TIME    *Time
+  )
+{
+  // Not a required feature
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Fixup internal data so that EFI can be call in virtual mode.
+  Call the passed in Child Notify event and convert any pointers in
+  lib to virtual mode.
+
+  @param[in]    Event   The Event that is being processed
+  @param[in]    Context Event Context
+
+**/
+VOID
+EFIAPI
+LibRtcVirtualNotifyEvent (
+  IN EFI_EVENT        Event,
+  IN VOID             *Context
+  )
+{
+  //
+  // Only needed if you are going to support the OS calling RTC functions in virtual mode.
+  // You will need to call EfiConvertPointer (). To convert any stored physical addresses
+  // to virtual address. After the OS transitions to calling in virtual mode, all future
+  // runtime calls will be made in virtual mode.
+  //
+  EfiConvertPointer (0x0, (VOID **)&mRtcBase);
+
+  return;
+}
+
+/**
+  This is the declaration of an EFI image entry point. This can be the entry point to an application
+  written to this specification, an EFI boot service driver, or an EFI runtime driver.
+
+  @param[in]  ImageHandle           Handle that identifies the loaded image.
+  @param[in]  SystemTable           System Table for this image.
+
+  @retval     EFI_SUCCESS           The operation completed successfully.
+
+**/
+EFI_STATUS
+EFIAPI
+LibRtcInitialize (
+  IN EFI_HANDLE                            ImageHandle,
+  IN EFI_SYSTEM_TABLE                      *SystemTable
+  )
+{
+  EFI_STATUS    Status;
+  EFI_HANDLE      Handle;
+  INT16         TimeZone;
+  UINTN         Size;
+  EFI_TIME    Time;
+  UINT8     Daylight;
+  //
+  // Initialize RTC Base Address
+  //
+  mRtcBase = PcdGet32 (PcdRtcBaseAddress);
+  //
+  // Declare the controller as EFI_MEMORY_RUNTIME
+  //
+  Status = gDS->AddMemorySpace (
+    EfiGcdMemoryTypeMemoryMappedIo,
+    mRtcBase,
+    SIZE_4KB,
+    EFI_MEMORY_UC | EFI_MEMORY_RUNTIME
+    );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+  //
+  //init timezone
+  //
+  Size = sizeof (TimeZone);
+  Status = EfiGetVariable (
+    (CHAR16 *)mTimeZoneVariableName,
+    &gEfiCallerIdGuid,
+    NULL,
+    &Size,
+    (VOID *)&TimeZone
+    );
+  if (EFI_ERROR (Status)) {
+    ASSERT (Status != EFI_INVALID_PARAMETER);
+    ASSERT (Status != EFI_BUFFER_TOO_SMALL);
+    //
+    // The time zone variable does not exist in non-volatile storage, so create it.
+    //UTC 8:00
+    //
+    Time.TimeZone = -480;
+    //
+    // Store it
+    //
+    Status = EfiSetVariable (
+      (CHAR16 *)mTimeZoneVariableName,
+      &gEfiCallerIdGuid,
+      EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+      Size,
+      (VOID *)&(Time.TimeZone)
+      );
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+  }
+  //
+  //daylight init
+  //
+  Size = sizeof (Daylight);
+  Status = EfiGetVariable (
+    (CHAR16 *)mDaylightVariableName,
+    &gEfiCallerIdGuid,
+    NULL,
+    &Size,
+    (VOID *)&Daylight
+  );
+  if (EFI_ERROR (Status)) {
+    ASSERT (Status != EFI_INVALID_PARAMETER);
+    ASSERT (Status != EFI_BUFFER_TOO_SMALL);
+    //
+    // The daylight variable does not exist in non-volatile storage, so create it.
+    //
+    Time.Daylight = 0;
+    //
+    // Store it
+    //
+    Status = EfiSetVariable (
+      (CHAR16 *)mDaylightVariableName,
+      &gEfiCallerIdGuid,
+      EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+      Size,
+      (VOID *)&(Time.Daylight)
+      );
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+  }
+
+  Status = gDS->SetMemorySpaceAttributes (mRtcBase, SIZE_4KB, EFI_MEMORY_UC | EFI_MEMORY_RUNTIME);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+  //
+  // Install the protocol
+  //
+  Handle = NULL;
+  Status = gBS->InstallMultipleProtocolInterfaces (
+    &Handle,
+    &gEfiRealTimeClockArchProtocolGuid,
+    NULL,
+    NULL
+    );
+  ASSERT_EFI_ERROR (Status);
+  //
+  // Register for the virtual address change event
+  //
+  Status = gBS->CreateEventEx (
+    EVT_NOTIFY_SIGNAL,
+    TPL_NOTIFY,
+    LibRtcVirtualNotifyEvent,
+    NULL,
+    &gEfiEventVirtualAddressChangeGuid,
+    &mRtcVirtualAddrChangeEvent
+    );
+  ASSERT_EFI_ERROR (Status);
+  return Status;
+}
-- 
2.25.1