reactos/ntoskrnl/ke/time.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         BSD - See COPYING.ARM in the top level directory
   4  * FILE:            ntoskrnl/ke/time.c
   5  * PURPOSE:         Implements timebase functionality
   6  * PROGRAMMERS:     ReactOS Portable Systems Group
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 /* GLOBALS ********************************************************************/
  16
  17 LONG KiTickOffset;
  18 ULONG KeTimeAdjustment;
  19
  20 /* FUNCTIONS ******************************************************************/
  21
  22 VOID
  23 FASTCALL
  24 KeUpdateSystemTime(IN PKTRAP_FRAME TrapFrame,
  25                    IN ULONG Increment,
  26                    IN KIRQL Irql)
  27 {
  28     PKPRCB Prcb = KeGetCurrentPrcb();
  29     ULARGE_INTEGER CurrentTime, InterruptTime;
  30     ULONG Hand, OldTickCount;
  31
  32     /* Add the increment time to the shared data */
  33     InterruptTime.HighPart = SharedUserData->InterruptTime.High1Time;
  34     InterruptTime.LowPart = SharedUserData->InterruptTime.LowPart;
  35     InterruptTime.QuadPart += Increment;
  36     SharedUserData->InterruptTime.High1Time = InterruptTime.HighPart;
  37     SharedUserData->InterruptTime.LowPart = InterruptTime.LowPart;
  38     SharedUserData->InterruptTime.High2Time = InterruptTime.HighPart;
  39
  40     /* Update tick count */
  41     InterlockedExchangeAdd(&KiTickOffset, -(LONG)Increment);
  42
  43     /* Check for incomplete tick */
  44     OldTickCount = KeTickCount.LowPart;
  45     if (KiTickOffset <= 0)
  46     {
  47         /* Update the system time */
  48         CurrentTime.HighPart = SharedUserData->SystemTime.High1Time;
  49         CurrentTime.LowPart = SharedUserData->SystemTime.LowPart;
  50         CurrentTime.QuadPart += KeTimeAdjustment;
  51         SharedUserData->SystemTime.High2Time = CurrentTime.HighPart;
  52         SharedUserData->SystemTime.LowPart = CurrentTime.LowPart;
  53         SharedUserData->SystemTime.High1Time = CurrentTime.HighPart;
  54
  55         /* Update the tick count */
  56         CurrentTime.HighPart = KeTickCount.High1Time;
  57         CurrentTime.LowPart = OldTickCount;
  58         CurrentTime.QuadPart += 1;
  59         KeTickCount.High2Time = CurrentTime.HighPart;
  60         KeTickCount.LowPart = CurrentTime.LowPart;
  61         KeTickCount.High1Time = CurrentTime.HighPart;
  62
  63         /* Update it in the shared user data */
  64         SharedUserData->TickCount.High2Time = CurrentTime.HighPart;
  65         SharedUserData->TickCount.LowPart = CurrentTime.LowPart;
  66         SharedUserData->TickCount.High1Time = CurrentTime.HighPart;
  67
  68         /* Check for timer expiration */
  69         Hand = OldTickCount & (TIMER_TABLE_SIZE - 1);
  70         if (KiTimerTableListHead[Hand].Time.QuadPart <= InterruptTime.QuadPart)
  71         {
  72             /* Check if we are already doing expiration */
  73             if (!Prcb->TimerRequest)
  74             {
  75                 /* Request a DPC to handle this */
  76                 Prcb->TimerRequest = (ULONG_PTR)TrapFrame;
  77                 Prcb->TimerHand = Hand;
  78                 HalRequestSoftwareInterrupt(DISPATCH_LEVEL);
  79             }
  80         }
  81
  82         /* Check for expiration with the new tick count as well */
  83         OldTickCount++;
  84     }
  85
  86     /* Check for timer expiration */
  87     Hand = OldTickCount & (TIMER_TABLE_SIZE - 1);
  88     if (KiTimerTableListHead[Hand].Time.QuadPart <= InterruptTime.QuadPart)
  89     {
  90         /* Check if we are already doing expiration */
  91         if (!Prcb->TimerRequest)
  92         {
  93             /* Request a DPC to handle this */
  94             Prcb->TimerRequest = (ULONG_PTR)TrapFrame;
  95             Prcb->TimerHand = Hand;
  96             HalRequestSoftwareInterrupt(DISPATCH_LEVEL);
  97         }
  98     }
  99
 100     /* Check if this was a full tick */
 101     if (KiTickOffset <= 0)
 102     {
 103         /* Update the tick offset */
 104         KiTickOffset += KeMaximumIncrement;
 105
 106         /* Update system runtime */
 107         KeUpdateRunTime(TrapFrame, Irql);
 108     }
 109     else
 110     {
 111         /* Increase interrupt count and exit */
 112         Prcb->InterruptCount++;
 113     }
 114
 115     /* Disable interrupts and end the interrupt */
 116     _disable();
 117     HalEndSystemInterrupt(Irql, TrapFrame);
 118
 119     /* Exit the interrupt */
 120     KiEoiHelper(TrapFrame);
 121 }
 122
 123 VOID
 124 NTAPI
 125 KeUpdateRunTime(IN PKTRAP_FRAME TrapFrame,
 126                 IN KIRQL Irql)
 127 {
 128     PKTHREAD Thread = KeGetCurrentThread();
 129     PKPRCB Prcb = KeGetCurrentPrcb();
 130
 131     /* Increase interrupt count */
 132     Prcb->InterruptCount++;
 133
 134     /* Check if we came from user mode */
 135 #ifndef _M_ARM
 136     if ((TrapFrame->SegCs & MODE_MASK) || (TrapFrame->EFlags & EFLAGS_V86_MASK))
 137 #else
 138     if (TrapFrame->PreviousMode == UserMode)
 139 #endif
 140     {
 141         /* Increase thread user time */
 142         Prcb->UserTime++;
 143         Thread->UserTime++;
 144     }
 145     else
 146     {
 147         /* See if we were in an ISR */
 148         Prcb->KernelTime++;
 149         if (Irql > DISPATCH_LEVEL)
 150         {
 151             /* Handle that */
 152             Prcb->InterruptTime++;
 153         }
 154         else if ((Irql < DISPATCH_LEVEL) || !(Prcb->DpcRoutineActive))
 155         {
 156             /* Handle being in kernel mode */
 157             Thread->KernelTime++;
 158         }
 159         else
 160         {
 161             /* Handle being in a DPC */
 162             Prcb->DpcTime++;
 163         }
 164     }
 165
 166     /* Update DPC rates */
 167     Prcb->DpcRequestRate = ((Prcb->DpcData[0].DpcCount - Prcb->DpcLastCount) +
 168                             Prcb->DpcRequestRate) >> 1;
 169     Prcb->DpcLastCount = Prcb->DpcData[0].DpcCount;
 170
 171     /* Check if the queue is large enough */
 172     if ((Prcb->DpcData[0].DpcQueueDepth) && !(Prcb->DpcRoutineActive))
 173     {
 174         /* Request a DPC */
 175         Prcb->AdjustDpcThreshold = KiAdjustDpcThreshold;
 176         HalRequestSoftwareInterrupt(DISPATCH_LEVEL);
 177
 178         /* Fix the maximum queue depth */
 179         if ((Prcb->DpcRequestRate < KiIdealDpcRate) &&
 180             (Prcb->MaximumDpcQueueDepth > 1))
 181         {
 182             /* Make it smaller */
 183             Prcb->MaximumDpcQueueDepth--;
 184         }
 185     }
 186     else
 187     {
 188         /* Check if we've reached the adjustment limit */
 189         if (!(--Prcb->AdjustDpcThreshold))
 190         {
 191             /* Reset it, and check the queue maximum */
 192             Prcb->AdjustDpcThreshold = KiAdjustDpcThreshold;
 193             if (KiMaximumDpcQueueDepth != Prcb->MaximumDpcQueueDepth)
 194             {
 195                 /* Increase it */
 196                 Prcb->MaximumDpcQueueDepth++;
 197             }
 198         }
 199     }
 200
 201     /* Decrement the thread quantum */
 202     Thread->Quantum -= CLOCK_QUANTUM_DECREMENT;
 203
 204     /* Check if the time expired */
 205     if ((Thread->Quantum <= 0) && (Thread != Prcb->IdleThread))
 206     {
 207         /* Schedule a quantum end */
 208         Prcb->QuantumEnd = 1;
 209         HalRequestSoftwareInterrupt(DISPATCH_LEVEL);
 210     }
 211 }