/**
Sets the current local time and date information.
@param 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
SetTime (
IN EFI_TIME *Time
)
{
return LibSetTime (Time);
}
/**
Sets the current local time and date information.
@param 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
SetTime (
IN EFI_TIME *Time
)
{
EFI_STATUS Status;
BOOLEAN TimeSettingsChanged;
if (Time == NULL || !IsTimeValid (Time)) {
return EFI_INVALID_PARAMETER;
}
TimeSettingsChanged = FALSE;
if (mTimeSettings.TimeZone != Time->TimeZone ||
mTimeSettings.Daylight != Time->Daylight) {
mTimeSettings.TimeZone = Time->TimeZone;
mTimeSettings.Daylight = Time->Daylight;
TimeSettingsChanged = TRUE;
}
Status = LibSetTime (Time);
if (EFI_ERROR (Status)) {
return Status;
}
if (TimeSettingsChanged) {
Status = EfiSetVariable (
(CHAR16 *)mTimeSettingsVariableName,
&gEfiCallerIdGuid,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
sizeof (mTimeSettings),
(VOID *)&mTimeSettings);
if (EFI_ERROR (Status)) {
return EFI_DEVICE_ERROR;
}
}
return EFI_SUCCESS;
}
VOID
LibRtcInitialize (
VOID
)
{
EFI_STATUS Status;
RTC_REGISTER_A RegisterA;
RTC_REGISTER_B RegisterB;
RTC_REGISTER_C RegisterC;
RTC_REGISTER_D RegisterD;
UINT8 Century;
EFI_TIME Time;
//
// Acquire RTC Lock to make access to RTC atomic
//
EfiAcquireLock (&mRtc.RtcLock);
//
// Initialize RTC Register
//
// Make sure Division Chain is properly configured,
// or RTC clock won't "tick" -- time won't increment
//
RegisterA.Data = RTC_INIT_REGISTER_A;
RtcWrite (RTC_ADDRESS_REGISTER_A, RegisterA.Data);
//
// Read Register B
//
RegisterB.Data = RtcRead (RTC_ADDRESS_REGISTER_B);
//
// Clear RTC flag register
//
RegisterC.Data = RtcRead (RTC_ADDRESS_REGISTER_C);
//
// Clear RTC register D
//
RegisterD.Data = RTC_INIT_REGISTER_D;
RtcWrite (RTC_ADDRESS_REGISTER_D, RegisterD.Data);
//
// Wait for up to 0.1 seconds for the RTC to be updated
//
Status = RtcWaitToUpdate (100000);
if (EFI_ERROR (Status)) {
EfiReleaseLock (&mRtc.RtcLock);
return;
}
//
// Get the Time/Date/Daylight Savings values.
//
Time.Second = RtcRead (RTC_ADDRESS_SECONDS);
Time.Minute = RtcRead (RTC_ADDRESS_MINUTES);
Time.Hour = RtcRead (RTC_ADDRESS_HOURS);
Time.Day = RtcRead (RTC_ADDRESS_DAY_OF_THE_MONTH);
Time.Month = RtcRead (RTC_ADDRESS_MONTH);
Time.Year = RtcRead (RTC_ADDRESS_YEAR);
ConvertRtcTimeToEfiTime (&Time, RegisterB);
if (RtcTestCenturyRegister () == EFI_SUCCESS) {
Century = BcdToDecimal ((UINT8) (RtcRead (RTC_ADDRESS_CENTURY) & 0x7f));
} else {
Century = BcdToDecimal (RtcRead (RTC_ADDRESS_CENTURY));
}
Time.Year = (UINT16) (Century * 100 + Time.Year);
//
// Set RTC configuration after get original time
//
RtcWrite (RTC_ADDRESS_REGISTER_B, RTC_INIT_REGISTER_B);
//
// Release RTC Lock.
//
EfiReleaseLock (&mRtc.RtcLock);
//
// Validate time fields
//
Status = RtcTimeFieldsValid (&Time);
if (EFI_ERROR (Status)) {
Time.Second = RTC_INIT_SECOND;
Time.Minute = RTC_INIT_MINUTE;
Time.Hour = RTC_INIT_HOUR;
Time.Day = RTC_INIT_DAY;
Time.Month = RTC_INIT_MONTH;
Time.Year = RTC_INIT_YEAR;
}
//
// Reset time value according to new RTC configuration
//
LibSetTime (&Time);
return;
}
