100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/ke/systime.cc
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* DESCRIPTION: Timebase and system clock support
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* DEVELOPERS: Aiken Harris <harraiken91@gmail.com>
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*/
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#include <xtos.hh>
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/**
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* Returns the current system time.
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*
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* @param SystemTime
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* Supplies a pointer to a variable that receives the current system time.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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KE::SystemTime::GetSystemTime(OUT PLARGE_INTEGER SystemTime)
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{
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LARGE_INTEGER CurrentTime;
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/* Fetch the time using the lock-free shared data mechanism and return it */
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CurrentTime = KE::SharedData::GetSystemTime();
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SystemTime->QuadPart = CurrentTime.QuadPart;
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}
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/**
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* Sets the system time, updates the boot time, and optionally updates the hardware Real-Time Clock (RTC).
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*
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* @param NewTime
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* Supplies a pointer to the new system time.
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*
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* @param OldTime
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* Supplies a pointer to a variable that receives the previous system time.
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*
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* @param AdjustInterruptTime
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* Specifies if the physical interrupt time should be adjusted.
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*
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* @param WriteToRtc
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* Specifies if the new system time should be written to RTC.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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KE::SystemTime::SetSystemTime(IN PLARGE_INTEGER NewTime,
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OUT PLARGE_INTEGER OldTime,
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IN BOOLEAN CorrectInterruptTime,
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IN BOOLEAN WriteToRtc)
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{
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LARGE_INTEGER TimeDelta;
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TIME_FIELDS TimeFields;
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/* Check if the new system time should be written to the RTC */
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if(WriteToRtc)
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{
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/* Convert the new system time to a human-readable calendar structure */
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RTL::Time::XtEpochToTimeFields(NewTime, &TimeFields);
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}
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/* Start a guarded code block */
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{
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/* Raise runlevel to HIGH level */
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KE::RaiseRunLevel Runlevel(HIGH_LEVEL);
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/* Save the previous system time for the caller and for delta calculation */
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GetSystemTime(OldTime);
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/* Write new system time to the Kernel Shared Data */
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KE::SharedData::SetSystemTime(*NewTime);
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/* Check if the new system time should be written to the RTC */
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if(WriteToRtc)
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{
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/* Update the hardware CMOS clock */
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HL::Rtc::SetRealTimeClock(&TimeFields);
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}
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/* Calculate the time difference */
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TimeDelta.QuadPart = NewTime->QuadPart - OldTime->QuadPart;
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/* Update the boot time by the delta */
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BootTime.QuadPart += TimeDelta.QuadPart;
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}
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/* Check if interrupt time needs to be corrected */
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if(CorrectInterruptTime)
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{
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UNIMPLEMENTED;
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}
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}
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