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- Use __KeStallExecutionProcessor instead of plain loop in HalCalibratePerformanceCounter since __KeStallExecutionProcessor is safe even for optimized builds.

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svn path=/trunk/; revision=10361
This commit is contained in:
Filip Navara 2004-08-02 15:09:22 +00:00
parent 64a312d97d
commit 3639da0250
1 changed files with 3 additions and 4 deletions
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7
reactos/hal/halx86/timer.c
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@ -20,7 +20,7 @@
* MA 02139, USA. * MA 02139, USA.
* *
*/ */
/* $Id: timer.c,v 1.5 2004/07/20 21:25:36 hbirr Exp $ /* $Id: timer.c,v 1.6 2004/08/02 15:09:22 navaraf Exp $
* *
* PROJECT: ReactOS kernel * PROJECT: ReactOS kernel
* FILE: ntoskrnl/hal/x86/udelay.c * FILE: ntoskrnl/hal/x86/udelay.c
@ -97,7 +97,7 @@ static BOOLEAN UdelayCalibrated = FALSE;
* also access RAM at the same time - making the delay imprecise. * also access RAM at the same time - making the delay imprecise.
* 2. Use compiler-specific #pragma's to disable optimization. * 2. Use compiler-specific #pragma's to disable optimization.
* 3. Use inline assembly, making it equally unportable as #2. * 3. Use inline assembly, making it equally unportable as #2.
* For supported compilers we use incline assembler. for the others, * For supported compilers we use inline assembler. For the others,
* portable plain C. * portable plain C.
*/ */
VOID STDCALL VOID STDCALL
@ -262,14 +262,13 @@ VOID HalpCalibrateStallExecution(VOID)
VOID STDCALL VOID STDCALL
HalCalibratePerformanceCounter(ULONG Count) HalCalibratePerformanceCounter(ULONG Count)
{ {
ULONG i;
ULONG flags; ULONG flags;
/* save flags and disable interrupts */ /* save flags and disable interrupts */
Ki386SaveFlags(flags); Ki386SaveFlags(flags);
Ki386DisableInterrupts(); Ki386DisableInterrupts();
for (i = 0; i < Count; i++); __KeStallExecutionProcessor(Count);
/* restore flags */ /* restore flags */
Ki386RestoreFlags(flags); Ki386RestoreFlags(flags);