UINTN
EFIAPI
ArmGenericTimerGetTimerFreq (
VOID
)
{
UINTN ArchTimerFreq = 0;
ArmArchTimerReadReg (CntFrq, (VOID *)&ArchTimerFreq);
return ArchTimerFreq;
}
UINTN
EFIAPI
ArmGenericTimerGetTimerCtrlReg (
VOID
)
{
UINTN Value;
ArmArchTimerReadReg (CntpCtl, (VOID *)&Value);
return Value;
}
UINT64
EFIAPI
ArmGenericTimerGetSystemCount (
VOID
)
{
UINT64 SystemCount;
ArmArchTimerReadReg (CntPct, (VOID *)&SystemCount);
return SystemCount;
}
UINTN
EFIAPI
ArmGenericTimerGetTimerVal (
VOID
)
{
UINTN ArchTimerValue;
ArmArchTimerReadReg (CntpTval, (VOID *)&ArchTimerValue);
return ArchTimerValue;
}
UINT64
EFIAPI
ArmGenericTimerGetCompareVal (
VOID
)
{
UINT64 Value;
ArmArchTimerReadReg (CntpCval, (VOID *)&Value);
return Value;
}
VOID
EFIAPI
ArmGenericTimerDisableTimer (
VOID
)
{
UINTN TimerCtrlReg;
ArmArchTimerReadReg (CntpCtl, (VOID *)&TimerCtrlReg);
TimerCtrlReg &= ~ARM_ARCH_TIMER_ENABLE;
ArmArchTimerWriteReg (CntpCtl, (VOID *)&TimerCtrlReg);
}
/**
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
LibSetTime (
IN EFI_TIME *Time
)
{
EFI_STATUS Status;
UINTN EpochSeconds;
UINTN Temp;
// Check the input parameters are within the range specified by UEFI
if ((Time->Year < 1900) ||
(Time->Year > 9999) ||
(Time->Month < 1 ) ||
(Time->Month > 12 ) ||
(!DayValid (Time) ) ||
(Time->Hour > 23 ) ||
(Time->Minute > 59 ) ||
(Time->Second > 59 ) ||
(Time->Nanosecond > 999999999) ||
(!((Time->TimeZone == EFI_UNSPECIFIED_TIMEZONE) || ((Time->TimeZone >= -1440) && (Time->TimeZone <= 1440)))) ||
(Time->Daylight & (~(EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT)))
) {
Status = EFI_INVALID_PARAMETER;
goto EXIT;
}
// Because the PL031 is a 32-bit counter counting seconds,
// 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)) {
Status = EFI_UNSUPPORTED;
goto EXIT;
}
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;
}
// TODO: Automatic Daylight activation
// Adjust for the correct period
if ((Time->Daylight & EFI_TIME_IN_DAYLIGHT) == EFI_TIME_IN_DAYLIGHT) {
// Convert to un-adjusted time, i.e. fall back one hour
EpochSeconds -= SEC_PER_HOUR;
}
ArmArchTimerReadReg(CntPct,&Temp);
// UINT32 force convertion for PC-LINT
mEpochDiff = EpochSeconds - Temp / (UINT32) PcdGet32(PcdArmArchTimerFreqInHz);
// The accesses to Variable Services can be very slow, because we may be writing to Flash.
// Do this after having set the RTC.
// Save the current time zone information into non-volatile storage
Status = mRT->SetVariable (
(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)) {
DEBUG ((
EFI_D_ERROR,
"LibSetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mTimeZoneVariableName,
Status
));
goto EXIT;
}
// Save the current daylight information into non-volatile storage
Status = mRT->SetVariable (
(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)) {
DEBUG ((
EFI_D_ERROR,
"LibSetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mDaylightVariableName,
Status
));
goto EXIT;
}
EXIT:
return Status;
}
/**
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
)
{
EFI_STATUS Status = EFI_SUCCESS;
UINT64 Temp;
UINT32 EpochSeconds;
INT16 TimeZone = 0;
UINT8 Daylight = 0;
UINTN Size;
// Ensure Time is a valid pointer
if (Time == NULL) {
return EFI_INVALID_PARAMETER;
}
ArmArchTimerReadReg(CntPct,&Temp);
// UINT32 force convertion for PC-LINT
EpochSeconds = mEpochDiff + Temp / (UINT32) PcdGet32(PcdArmArchTimerFreqInHz);
// Get the current time zone information from non-volatile storage
Size = sizeof (TimeZone);
Status = mRT->GetVariable (
(CHAR16 *)mTimeZoneVariableName,
&gEfiCallerIdGuid,
NULL,
&Size,
(VOID *)&TimeZone
);
if (EFI_ERROR (Status)) {
ASSERT(Status != EFI_INVALID_PARAMETER);
ASSERT(Status != EFI_BUFFER_TOO_SMALL);
if (Status != EFI_NOT_FOUND)
goto EXIT;
// The time zone variable does not exist in non-volatile storage, so create it.
Time->TimeZone = EFI_UNSPECIFIED_TIMEZONE;
// Store it
Status = mRT->SetVariable (
(CHAR16 *)mTimeZoneVariableName,
&gEfiCallerIdGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
Size,
(VOID *)&(Time->TimeZone)
);
if (EFI_ERROR (Status)) {
DEBUG ((
EFI_D_ERROR,
"LibGetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mTimeZoneVariableName,
Status
));
goto EXIT;
}
} 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 = mRT->GetVariable (
(CHAR16 *)mDaylightVariableName,
&gEfiCallerIdGuid,
NULL,
&Size,
(VOID *)&Daylight
);
if (EFI_ERROR (Status)) {
ASSERT(Status != EFI_INVALID_PARAMETER);
ASSERT(Status != EFI_BUFFER_TOO_SMALL);
if (Status != EFI_NOT_FOUND)
goto EXIT;
// The daylight variable does not exist in non-volatile storage, so create it.
Time->Daylight = 0;
// Store it
Status = mRT->SetVariable (
(CHAR16 *)mDaylightVariableName,
&gEfiCallerIdGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
Size,
(VOID *)&(Time->Daylight)
);
if (EFI_ERROR (Status)) {
DEBUG ((
EFI_D_ERROR,
"LibGetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mDaylightVariableName,
Status
));
goto EXIT;
}
} 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);
// Update the Capabilities info
if (Capabilities != NULL) {
Capabilities->Resolution = 1;
// Accuracy in ppm multiplied by 1,000,000, e.g. for 50ppm set 50,000,000
Capabilities->Accuracy = PcdGet32 (PcdArmArchTimerFreqInHz);
// FALSE: Setting the time does not clear the values below the resolution level
Capabilities->SetsToZero = FALSE;
}
EXIT:
return Status;
}
