#include <ntoskrnl.h>
#include <debug.h>

Include dependency graph for clock.c:

Macros
#define	NDEBUG

Functions
VOID NTAPI	KeSetSystemTime (IN PLARGE_INTEGER NewTime, OUT PLARGE_INTEGER OldTime, IN BOOLEAN FixInterruptTime, IN PLARGE_INTEGER HalTime OPTIONAL)

ULONG NTAPI	KeQueryTimeIncrement (VOID)

VOID NTAPI	KeQueryTickCount (IN PLARGE_INTEGER TickCount)

VOID NTAPI	KeQuerySystemTime (OUT PLARGE_INTEGER CurrentTime)

ULONGLONG NTAPI	KeQueryInterruptTime (VOID)

VOID NTAPI	KeSetTimeIncrement (IN ULONG MaxIncrement, IN ULONG MinIncrement)

Variables
LARGE_INTEGER	KeBootTime

ULONGLONG	KeBootTimeBias

volatile KSYSTEM_TIME	KeTickCount = { 0, 0, 0 }

ULONG	KeMaximumIncrement

ULONG	KeMinimumIncrement

ULONG	KeTimeIncrement

Macro Definition Documentation

◆ NDEBUG

#define NDEBUG

Definition at line 12 of file clock.c.

Function Documentation

◆ KeQueryInterruptTime()

ULONGLONG NTAPI KeQueryInterruptTime ( VOID )

Definition at line 203 of file clock.c.

 {
     LARGE_INTEGER CurrentTime;
 
     /* Loop until we get a perfect match */
     for (;;)
     {
         /* Read the time value */
         CurrentTime.HighPart = SharedUserData->InterruptTime.High1Time;
         CurrentTime.LowPart = SharedUserData->InterruptTime.LowPart;
         if (CurrentTime.HighPart ==
             SharedUserData->InterruptTime.High2Time) break;
         YieldProcessor();
     }
 
     /* Return the time value */
     return CurrentTime.QuadPart;
 }

Referenced by CmBattAddBattery(), CmBattGetBatteryStatus(), CmBattQueryInformation(), CmBattQueryTag(), ExAllocatePoolWithTag(), i8042MouInputTestTimeout(), KeDelayExecutionThread(), KeRemoveQueue(), KeWaitForMultipleObjects(), KeWaitForSingleObject(), KiComputeDueTime(), KiInsertTimerTable(), KiRecalculateDueTime(), KiTimerExpiration(), KxSetTimerForThreadWait(), and NtQueryTimer().

◆ KeQuerySystemTime()

VOID NTAPI KeQuerySystemTime ( OUT PLARGE_INTEGER CurrentTime )

Definition at line 184 of file clock.c.

 {
     /* Loop until we get a perfect match */
     for (;;)
     {
         /* Read the time value */
         CurrentTime->HighPart = SharedUserData->SystemTime.High1Time;
         CurrentTime->LowPart = SharedUserData->SystemTime.LowPart;
         if (CurrentTime->HighPart ==
             SharedUserData->SystemTime.High2Time) break;
         YieldProcessor();
     }
 }

Referenced by KeSetSystemTime().

◆ KeQueryTickCount()

VOID NTAPI KeQueryTickCount ( IN PLARGE_INTEGER TickCount )

Definition at line 165 of file clock.c.

 {
     /* Loop until we get a perfect match */
     for (;;)
     {
         /* Read the tick count value */
         TickCount->HighPart = KeTickCount.High1Time;
         TickCount->LowPart = KeTickCount.LowPart;
         if (TickCount->HighPart == KeTickCount.High2Time) break;
         YieldProcessor();
     }
 }

Referenced by ClassAcquireRemoveLockEx(), ClassInterpretSenseInfo(), ClasspRetryDpcTimer(), ClasspRetryRequestDpc(), ClassReleaseRemoveLock(), ClassRetryRequest(), CTESystemUpTime(), DoRebootCommand(), EngGetTickCount(), IoAcquireRemoveLockEx(), IoReleaseRemoveLockEx(), JIFFIES(), KsecGatherEntropyData(), KsecGenRandom(), MiCreatePebOrTeb(), MmAllocateSpecialPool(), MmFreeSpecialPool(), NdisGetSystemUpTime(), and RxMarkFobxOnCleanup().

◆ KeQueryTimeIncrement()

ULONG NTAPI KeQueryTimeIncrement ( VOID )

Definition at line 153 of file clock.c.

 {
     /* Return the increment */
     return KeMaximumIncrement;
 }

Referenced by ClasspInterpretGesnData(), ClassPnpStartDevice(), ClassReleaseRemoveLock(), DoRebootCommand(), DriverEntry(), IoInitializeRemoveLockEx(), JIFFIES(), NdisGetSystemUpTime(), PciStallForPowerChange(), QSI_DEF(), RetryTransferPacket(), USBH_Wait(), USBPORT_RequestAsyncCallback(), USBPORT_SoftInterrupt(), USBPORT_StartTimer(), USBPORT_TimerDpc(), and USBPORT_Wait().

◆ KeSetSystemTime()

VOID NTAPI KeSetSystemTime	(	IN PLARGE_INTEGER	NewTime,
		OUT PLARGE_INTEGER	OldTime,
		IN BOOLEAN	FixInterruptTime,
		IN PLARGE_INTEGER HalTime	OPTIONAL
	)

Definition at line 28 of file clock.c.

 {
     TIME_FIELDS TimeFields;
     KIRQL OldIrql, OldIrql2;
     LARGE_INTEGER DeltaTime;
     PLIST_ENTRY ListHead, NextEntry;
     PKTIMER Timer;
     PKSPIN_LOCK_QUEUE LockQueue;
     LIST_ENTRY TempList, TempList2;
     ULONG Hand, i;
 
     /* Sanity checks */
     ASSERT((NewTime->HighPart & 0xF0000000) == 0);
     ASSERT(KeGetCurrentIrql() <= DISPATCH_LEVEL);
 
     /* Check if this is for the HAL */
     if (HalTime) RtlTimeToTimeFields(HalTime, &TimeFields);
 
     /* Set affinity to this CPU, lock the dispatcher, and raise IRQL */
     KeSetSystemAffinityThread(1);
     OldIrql = KiAcquireDispatcherLock();
     KeRaiseIrql(HIGH_LEVEL, &OldIrql2);
 
     /* Query the system time now */
     KeQuerySystemTime(OldTime);
 
     /* Set the new system time (ordering of these operations is critical) */
     SharedUserData->SystemTime.High2Time = NewTime->HighPart;
     SharedUserData->SystemTime.LowPart = NewTime->LowPart;
     SharedUserData->SystemTime.High1Time = NewTime->HighPart;
 
     /* Check if this was for the HAL and set the RTC time */
     if (HalTime) ExCmosClockIsSane = HalSetRealTimeClock(&TimeFields);
 
     /* Calculate the difference between the new and the old time */
     DeltaTime.QuadPart = NewTime->QuadPart - OldTime->QuadPart;
 
     /* Update system boot time */
     KeBootTime.QuadPart += DeltaTime.QuadPart;
     KeBootTimeBias = KeBootTimeBias + DeltaTime.QuadPart;
 
     /* Lower IRQL back */
     KeLowerIrql(OldIrql2);
 
     /* Check if we need to adjust interrupt time */
     if (FixInterruptTime) ASSERT(FALSE);
 
     /* Setup a temporary list of absolute timers */
     InitializeListHead(&TempList);
 
     /* Loop current timers */
     for (i = 0; i < TIMER_TABLE_SIZE; i++)
     {
         /* Loop the entries in this table and lock the timers */
         ListHead = &KiTimerTableListHead[i].Entry;
         LockQueue = KiAcquireTimerLock(i);
         NextEntry = ListHead->Flink;
         while (NextEntry != ListHead)
         {
             /* Get the timer */
             Timer = CONTAINING_RECORD(NextEntry, KTIMER, TimerListEntry);
             NextEntry = NextEntry->Flink;
 
             /* Is it absolute? */
             if (Timer->Header.Absolute)
             {
                 /* Remove it from the timer list */
                 KiRemoveEntryTimer(Timer);
 
                 /* Insert it into our temporary list */
                 InsertTailList(&TempList, &Timer->TimerListEntry);
             }
         }
 
         /* Release the lock */
         KiReleaseTimerLock(LockQueue);
     }
 
     /* Setup a temporary list of expired timers */
     InitializeListHead(&TempList2);
 
     /* Loop absolute timers */
     while (TempList.Flink != &TempList)
     {
         /* Get the timer */
         Timer = CONTAINING_RECORD(TempList.Flink, KTIMER, TimerListEntry);
         RemoveEntryList(&Timer->TimerListEntry);
 
         /* Update the due time and handle */
         Timer->DueTime.QuadPart -= DeltaTime.QuadPart;
         Hand = KiComputeTimerTableIndex(Timer->DueTime.QuadPart);
         Timer->Header.Hand = (UCHAR)Hand;
 
         /* Lock the timer and re-insert it */
         LockQueue = KiAcquireTimerLock(Hand);
         if (KiInsertTimerTable(Timer, Hand))
         {
             /* Remove it from the timer list */
             KiRemoveEntryTimer(Timer);
 
             /* Insert it into our temporary list */
             InsertTailList(&TempList2, &Timer->TimerListEntry);
         }
 
         /* Release the lock */
         KiReleaseTimerLock(LockQueue);
     }
 
     /* Process expired timers. This releases the dispatcher lock. */
     KiTimerListExpire(&TempList2, OldIrql);
 
     /* Revert affinity */
     KeRevertToUserAffinityThread();
 }

Referenced by ExpSetTimeZoneInformation(), NtSetSystemTime(), and Phase1InitializationDiscard().

◆ KeSetTimeIncrement()

VOID NTAPI KeSetTimeIncrement	(	IN ULONG	MaxIncrement,
		IN ULONG	MinIncrement
	)

Definition at line 228 of file clock.c.

 {
     /* Set some Internal Variables */
     KeMaximumIncrement = MaxIncrement;
     KeMinimumIncrement = max(MinIncrement, 10000);
     KeTimeAdjustment = MaxIncrement;
     KeTimeIncrement = MaxIncrement;
     KiTickOffset = MaxIncrement;
 }