ULONG
NTAPI
HalpSetCmosData(IN ULONG BusNumber,
IN ULONG SlotNumber,
IN PVOID Buffer,
IN ULONG Length)
{
PUCHAR Ptr = (PUCHAR)Buffer;
ULONG Address = SlotNumber;
ULONG Len = Length;
/* FIXME: Acquire CMOS Lock */
/* Do nothing if we don't have a length */
if (!Length) return 0;
/* Check if this is simple CMOS */
if (!BusNumber)
{
/* Loop the buffer up to 0xFF */
while ((Len > 0) && (Address < 0x100))
{
/* Write the data */
HalpWriteCmos((UCHAR)Address, *Ptr);
/* Update position and length */
Ptr++;
Address++;
Len--;
}
}
else if (BusNumber == 1)
{
/* Loop the buffer up to 0xFFFF */
while ((Len > 0) && (Address < 0x10000))
{
/* Write the data */
HalpWriteCmos((UCHAR)Address, *Ptr);
/* Update position and length */
Ptr++;
Address++;
Len--;
}
}
/* FIXME: Release the CMOS Lock */
/* Return length read */
return Length - Len;
}
/*
* @implemented
*/
BOOLEAN
NTAPI
HalSetRealTimeClock(IN PTIME_FIELDS Time)
{
/* FIXME: Acquire CMOS Lock */
/* Loop while update is in progress */
while ((HalpReadCmos(RTC_REGISTER_A)) & RTC_REG_A_UIP);
/* Write time fields to CMOS RTC */
HalpWriteCmos(0, INT_BCD(Time->Second));
HalpWriteCmos(2, INT_BCD(Time->Minute));
HalpWriteCmos(4, INT_BCD(Time->Hour));
HalpWriteCmos(6, INT_BCD(Time->Weekday));
HalpWriteCmos(7, INT_BCD(Time->Day));
HalpWriteCmos(8, INT_BCD(Time->Month));
HalpWriteCmos(9, INT_BCD(Time->Year % 100));
/* FIXME: Set the century byte */
/* FIXME: Release the CMOS Lock */
/* Always return TRUE */
return TRUE;
}
/*
* @implemented
*/
VOID
NTAPI
HalStopProfileInterrupt(IN KPROFILE_SOURCE ProfileSource)
{
UCHAR StatusB;
/* Acquire the CMOS lock */
HalpAcquireCmosSpinLock();
/* Read Status Register B */
StatusB = HalpReadCmos(RTC_REGISTER_B);
/* Disable periodic interrupts */
StatusB = StatusB & ~RTC_REG_B_PI;
/* Write new value into Status Register B */
HalpWriteCmos(RTC_REGISTER_B, StatusB);
/* Release the CMOS lock */
HalpReleaseCmosSpinLock();
}
/*
* @implemented
*/
ARC_STATUS
NTAPI
HalSetEnvironmentVariable(IN PCH Name,
IN PCH Value)
{
UCHAR Val;
/* Only variable supported on x86 */
if (_stricmp(Name, "LastKnownGood")) return ENOMEM;
/* Check if this is true or false */
if (!_stricmp(Value, "TRUE"))
{
/* It's true, acquire CMOS lock (FIXME) */
/* Read the current value and add the flag */
Val = HalpReadCmos(RTC_REGISTER_B) | 1;
}
else if (!_stricmp(Value, "FALSE"))
{
/* It's false, acquire CMOS lock (FIXME) */
/* Read the current value and mask out the flag */
Val = HalpReadCmos(RTC_REGISTER_B) & ~1;
}
else
{
/* Fail */
return ENOMEM;
}
/* Write new value */
HalpWriteCmos(RTC_REGISTER_B, Val);
/* Release the lock and return success */
return ESUCCESS;
}
VOID
NTAPI
HalpInitializeTsc(VOID)
{
ULONG_PTR Flags;
KIDTENTRY OldIdtEntry, *IdtPointer;
PKPCR Pcr = KeGetPcr();
UCHAR RegisterA, RegisterB;
/* Check if the CPU supports RDTSC */
if (!(KeGetCurrentPrcb()->FeatureBits & KF_RDTSC))
{
KeBugCheck(HAL_INITIALIZATION_FAILED);
}
/* Save flags and disable interrupts */
Flags = __readeflags();
_disable();
/* Enable the periodic interrupt in the CMOS */
RegisterB = HalpReadCmos(RTC_REGISTER_B);
HalpWriteCmos(RTC_REGISTER_B, RegisterB | RTC_REG_B_PI);
/* Modify register A to RTC_MODE to get SAMPLE_FREQENCY */
RegisterA = HalpReadCmos(RTC_REGISTER_A);
RegisterA = (RegisterA & 0xF0) | RTC_MODE;
HalpWriteCmos(RTC_REGISTER_A, RegisterA);
/* Save old IDT entry */
IdtPointer = KiGetIdtEntry(Pcr, HalpRtcClockVector);
OldIdtEntry = *IdtPointer;
/* Set the calibration ISR */
KeRegisterInterruptHandler(HalpRtcClockVector, TscCalibrationISR);
/* Reset TSC value to 0 */
__writemsr(MSR_RDTSC, 0);
/* Enable the timer interupt */
HalEnableSystemInterrupt(HalpRtcClockVector, CLOCK_LEVEL, Latched);
/* Read register C, so that the next interrupt can happen */
HalpReadCmos(RTC_REGISTER_C);;
/* Wait for completion */
_enable();
while (TscCalibrationPhase < NUM_SAMPLES) _ReadWriteBarrier();
_disable();
/* Disable the periodic interrupt in the CMOS */
HalpWriteCmos(RTC_REGISTER_B, RegisterB & ~RTC_REG_B_PI);
/* Disable the timer interupt */
HalDisableSystemInterrupt(HalpRtcClockVector, CLOCK_LEVEL);
/* Restore old IDT entry */
*IdtPointer = OldIdtEntry;
/* Calculate an average, using simplified linear regression */
HalpCpuClockFrequency.QuadPart = DoLinearRegression(NUM_SAMPLES - 1,
TscCalibrationArray);
/* Restore flags */
__writeeflags(Flags);
}