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/** @file
Platform Real Time Clock Set Time driver.
Copyright (c) 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
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "PlatformRtc.h"
EFI_SET_TIME mOriginalSetTime;
/**
Save RTC Time to UEFI variable, and Sets the current local time and date information.
@param Time A pointer to the current time.
@retval EFI_SUCCESS The operation completed successfully.
**/
EFI_STATUS
EFIAPI
PlatformRtcSetTime (
IN EFI_TIME *Time
)
{
EFI_STATUS Status;
EFI_TIME RtcTime;
EFI_TIME RtcTime2;
UINTN DataSize;
if (Time == NULL) {
return EFI_INVALID_PARAMETER;
}
RtcTime = *Time;
//
// Save user setting time to variable.
//
if (RtcTime.Year != PcdGet16 (PcdMinimalValidYear)) {
DataSize = sizeof (EFI_TIME);
Status = gRT->GetVariable(
L"SystemRtcTime",
&gSystemRtcTimeVariableGuid,
NULL,
&DataSize,
&RtcTime2
);
if (EFI_ERROR(Status)) {
Status = EfiSetVariable (
SYSTEM_TIME_NAME,
&gSystemRtcTimeVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
sizeof (RtcTime),
&RtcTime
);
ASSERT(Status == EFI_SUCCESS);
} else {
if (~(((RtcTime.Year == RtcTime2.Year) && (RtcTime.Month == RtcTime2.Month) && (RtcTime.Day == RtcTime2.Day)) &&
((RtcTime.Hour == RtcTime2.Hour) && (RtcTime.Minute == RtcTime2.Minute) && (RtcTime.Second == RtcTime2.Second)))) {
//
// If the time to be set is the same as the saved RTC time, we do not need save the RTC time again.
//
Status = EfiSetVariable (
SYSTEM_TIME_NAME,
&gSystemRtcTimeVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
sizeof (RtcTime),
&RtcTime
);
ASSERT(Status == EFI_SUCCESS);
}
}
}
return mOriginalSetTime(Time);
}
VOID
EFIAPI
PlatformRtcSetTimeVirtualAddressChangeEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
gRT->ConvertPointer (0, (VOID **) &mOriginalSetTime);
}
/**
The User Entry Point for Platform RTC module.
This is the entry point for Platform RTC module. It installs the UEFI runtime service
including Platform SetTime().
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
**/
EFI_STATUS
EFIAPI
InitializePlatformRtc (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_EVENT Event;
//
// Make sure we can handle virtual address changes.
//
Event = NULL;
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_NOTIFY,
PlatformRtcSetTimeVirtualAddressChangeEvent,
NULL,
&gEfiEventVirtualAddressChangeGuid,
&Event
);
ASSERT_EFI_ERROR (Status);
mOriginalSetTime = gRT->SetTime;
gRT->SetTime = PlatformRtcSetTime;
return EFI_SUCCESS;
}
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