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- Implement a working version of KeQueryPerformanceCounter based on the C implementation (without the strange MHZed-based code) and also support updating the performance timer during a clock interrupt, otherwise the value might become stale during the query.
- Update clock interrupt handler to update the performance counter, and also detect if someone changed the clock rate (but don't yet support this). - Test app from previous revision now works beautifully. svn path=/trunk/; revision=24963
This commit is contained in:
Alex Ionescu
parent
7cd2e3f498
commit
f09a042483
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@ -10,7 +10,13 @@
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#include <asm.h>
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#include <internal/i386/asmmacro.S>
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.intel_syntax noprefix
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.extern _HalpCurrentTimeIncrement
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/* GLOBALS *******************************************************************/
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_HalpLastPerfCounterLow: .long 0
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_HalpLastPerfCounterHigh: .long 0
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_HalpPerfCounterLow: .long 0
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_HalpPerfCounterHigh: .long 0
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/* FUNCTIONS *****************************************************************/
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@ -45,6 +51,152 @@ Done:
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ret 4
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.endfunc
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.global _KeQueryPerformanceCounter@4
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.func KeQueryPerformanceCounter@4
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_KeQueryPerformanceCounter@4:
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/* Check if we were called too early */
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cmp dword ptr _HalpCurrentRollOver, 0
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je NoCount
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/* Save volatiles */
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push ebx
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push esi
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LoopPreInt:
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/* Disable interrupts */
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pushf
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cli
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LoopPostInt:
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/* Get the current value */
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mov ebx, _HalpPerfCounterLow
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mov esi, _HalpPerfCounterHigh
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/* Read 8254 timer */
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mov al, 0
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out 0x43, al
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jmp $+2
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in al, 0x40
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jmp $+2
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movzx ecx, al
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in al, 0x40
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mov ch, al
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/* Enable interrupts and do a short wait */
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popf
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nop
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jmp $+2
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/* Disable them again */
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pushf
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cli
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/* Get the counter value again */
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mov eax, _HalpPerfCounterLow
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mov edx, _HalpPerfCounterHigh
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/* Check if someone updated the counter */
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cmp eax, ebx
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jne LoopPostInt
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cmp edx, esi
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jne LoopPostInt
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/* Check if the current 8254 value causes rollover */
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neg ecx
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add ecx, _HalpCurrentRollOver
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jnb DoRollOver
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SetSum:
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/* Calculate the sum */
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add eax, ecx
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adc edx, 0
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/* Check if we're above or below the last high value */
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cmp edx, _HalpLastPerfCounterHigh
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jb short BelowHigh
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jnz short BelowLow
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/* Check if we're above or below the last low value */
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cmp eax, _HalpLastPerfCounterLow
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jb BelowHigh
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BelowLow:
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/* Update the last value and bring back interrupts */
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mov _HalpLastPerfCounterLow, eax
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mov _HalpLastPerfCounterHigh, edx
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popf
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/* Check if caller wants frequency */
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cmp dword ptr [esp+12], 0
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jz ReturnNoFreq
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/* Save hard-coded frequency */
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mov ecx, dword ptr [esp+12]
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mov dword ptr [ecx], 1193182
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mov dword ptr [ecx+4], 0
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ReturnNoFreq:
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/* Restore volatiles */
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pop esi
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pop ebx
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ret 4
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NoCount:
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/* Return empty, called too soon */
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mov eax, 0
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mov edx, 0
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ret 4
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DoRollOver:
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/* We might have an incoming interrupt, save EFLAGS and reset rollover */
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mov esi, [esp]
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mov ecx, _HalpCurrentRollOver
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popf
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/* Check if interrupts were enabled and try again */
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test esi, EFLAGS_INTERRUPT_MASK
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jnz LoopPreInt
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/* They're not, continue where we left */
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pushf
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jmp SetSum
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BelowHigh:
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/* Get the last counter values */
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mov ebx, _HalpLastPerfCounterLow
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mov esi, _HalpLastPerfCounterHigh
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/* Check if the previous value was 0 and go back if yes */
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mov ecx, ebx
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or ecx, esi
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jz BelowLow
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/* Fixup the count with the last known value */
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sub eax, ebx
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sbb edx, esi
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/* We might have an incoming interrupt, save EFLAGS */
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mov esi, [esp]
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popf
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/* Check if interrupts were enabled and try again */
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test esi, EFLAGS_INTERRUPT_MASK
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jnz LoopPreInt
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/* They're not, continue where we left */
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pushf
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jmp BelowLow
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.endfunc
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.globl _HalpClockInterrupt@0
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.func HalpClockInterrupt@0
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_HalpClockInterrupt@0:
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@ -66,10 +218,19 @@ _HalpClockInterrupt@0:
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or al, al
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jz Spurious
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/* Do a tick */
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mov eax, _HalpCurrentTimeIncrement
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/* Update the performance counter */
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xor ebx, ebx
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jmp _KeUpdateSystemTime@0
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mov eax, _HalpCurrentRollOver
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add _HalpPerfCounterLow, eax
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adc _HalpPerfCounterHigh, ebx
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/* Get the time increment and check if someone changed the clock rate */
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mov eax, _HalpCurrentTimeIncrement
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cmp _HalpClockSetMSRate, ebx
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jz _KeUpdateSystemTime@0
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/* FIXME: Someone did! */
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int 3
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Spurious:
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@ -294,56 +294,4 @@ VOID HalpCalibrateStallExecution(VOID)
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#endif
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}
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LARGE_INTEGER
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STDCALL
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KeQueryPerformanceCounter(PLARGE_INTEGER PerformanceFreq)
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/*
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* FUNCTION: Queries the finest grained running count available in the system
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* ARGUMENTS:
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* PerformanceFreq (OUT) = The routine stores the number of
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* performance counter ticks per second here
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* RETURNS: The number of performance counter ticks since boot
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*/
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{
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PKIPCR Pcr;
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LARGE_INTEGER Value;
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_disable();
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Pcr = (PKIPCR)KeGetPcr();
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if (Pcr->PrcbData.FeatureBits & KF_RDTSC)
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{
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_enable();
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if (NULL != PerformanceFreq)
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{
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PerformanceFreq->QuadPart = Pcr->PrcbData.MHz * (ULONGLONG)1000000;
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}
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Value.QuadPart = (LONGLONG)__rdtsc();
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}
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else
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{
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LARGE_INTEGER TicksOld;
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LARGE_INTEGER TicksNew;
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ULONG CountsLeft;
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_enable();
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if (NULL != PerformanceFreq)
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{
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PerformanceFreq->QuadPart = CLOCK_TICK_RATE;
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}
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do
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{
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KeQueryTickCount(&TicksOld);
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CountsLeft = Read8254Timer();
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Value.QuadPart = TicksOld.QuadPart * LATCH + (LATCH - CountsLeft);
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KeQueryTickCount(&TicksNew);
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}
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while (TicksOld.QuadPart != TicksNew.QuadPart);
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}
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return Value;
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}
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/* EOF */
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