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/** @file
Adjust Default System Time.
Copyright (c) 2015, 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 that 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 <PlatformDxe.h>
//
// Date and time initial values.
// They are used if the RTC values are invalid during driver initialization
//
#define RTC_INIT_SECOND 0
#define RTC_INIT_MINUTE 0
#define RTC_INIT_HOUR 0
#define RTC_ADDRESS_CENTURY 50 // R/W Range 19..20 Bit 8 is R/W
#define RTC_ADDRESS_REGISTER 0x70
#define RTC_DATA_REGISTER 0x71
CHAR16 mBiosReleaseDate[20];
/**
Convert a single character to number.
It assumes the input Char is in the scope of L'0' ~ L'9' and L'A' ~ L'F'
@param Char The input char which need to change to a hex number.
**/
UINTN
CharToUint (
IN CHAR16 Char
)
{
if ((Char >= L'0') && (Char <= L'9')) {
return (UINTN) (Char - L'0');
}
if ((Char >= L'A') && (Char <= L'F')) {
return (UINTN) (Char - L'A' + 0xA);
}
ASSERT (FALSE);
return 0;
}
/**
See if YEAR field of a variable of EFI_TIME type is correct.
@param Time The time to be checked.
@retval EFI_INVALID_PARAMETER Some fields of Time are not correct.
@retval EFI_SUCCESS Time is a valid EFI_TIME variable.
**/
EFI_STATUS
CheckRtcTimeFields (
IN EFI_TIME *Time
)
{
UINT16 YearBuilt;
YearBuilt = (UINT16)(CharToUint(mBiosReleaseDate[8])*10 + CharToUint(mBiosReleaseDate[9]) + 2000);
if ((Time->Year) < YearBuilt) {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
/**
ExitPmAuth Protocol notification event handler, which set initial system time to be
the time when BIOS was built.
@param[in] Event Event whose notification function is being invoked.
@param[in] Context Pointer to the notification function's context.
**/
VOID
EFIAPI
AdjustDefaultRtcTimeCallback (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
EFI_TIME EfiTime;
UINT8 Century;
CHAR16 BiosVersion[60];
CHAR16 BiosReleaseTime[20];
//
// Get BIOS built time from Bios-ID.
//
SetMem(BiosVersion, sizeof(BiosVersion), 0);
SetMem(mBiosReleaseDate, sizeof(mBiosReleaseDate), 0);
SetMem(BiosReleaseTime, sizeof(BiosReleaseTime), 0);
Status = GetBiosVersionDateTime (BiosVersion, mBiosReleaseDate, BiosReleaseTime);
ASSERT_EFI_ERROR(Status);
if (EFI_ERROR (Status)) {
return;
}
//
// Get current RTC time.
//
Status = gRT->GetTime (&EfiTime, NULL);
//
// Validate RTC time fields
//
Status = CheckRtcTimeFields (&EfiTime);
if (EFI_ERROR (Status)) {
//
// Date such as Dec 28th of 2015
//
// Month
// BiosReleaseDate[0] = '1';
// BiosReleaseDate[1] = '2';
//
// Day
// BiosReleaseDate[3] = '2';
// BiosReleaseDate[4] = '8';
//
//
// Year
//
// BiosReleaseDate[6] = '2';
// BiosReleaseDate[7] = '0';
// BiosReleaseDate[8] = '1'
// BiosReleaseDate[9] = '5';
EfiTime.Second = RTC_INIT_SECOND;
EfiTime.Minute = RTC_INIT_MINUTE;
EfiTime.Hour = RTC_INIT_HOUR;
EfiTime.Day = (UINT8)(CharToUint(mBiosReleaseDate[3])*10 + CharToUint(mBiosReleaseDate[4]));
EfiTime.Month = (UINT8)(CharToUint(mBiosReleaseDate[0])*10 + CharToUint(mBiosReleaseDate[1]));
EfiTime.Year = (UINT16)(CharToUint(mBiosReleaseDate[8])*10 + CharToUint(mBiosReleaseDate[9]) + 2000);
EfiTime.Nanosecond = 0;
EfiTime.TimeZone = EFI_UNSPECIFIED_TIMEZONE;
EfiTime.Daylight = 1;
DEBUG ((EFI_D_INFO, "Day:%d Month:%d Year:%d \n", (UINT32)EfiTime.Day, (UINT32)EfiTime.Month, (UINT32)EfiTime.Year));
//
// Reset time value according to new RTC configuration
//
Status = gRT->SetTime (&EfiTime);
ASSERT_EFI_ERROR(Status);
//
// Set the RTC century in case that UEFI SetTime sevice does not set this register.
//
Century = DecimalToBcd8 ((UINT8) (EfiTime.Year / 100));
IoWrite8 (RTC_ADDRESS_REGISTER, (UINT8) (RTC_ADDRESS_CENTURY | (UINT8) (IoRead8 (PCAT_RTC_ADDRESS_REGISTER) & 0x80)));
IoWrite8 (RTC_DATA_REGISTER, Century);
}
return;
}
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