reactos/wine
1
0
Fork 0
mirror of https://github.com/reactos/wine.git synced 2024-11-29 22:50:43 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Return a fixed frequency of 1193182 Hz for the Performance Counter.

Browse Source
This commit is contained in:
Rein Klazes 2005-01-19 17:01:06 +00:00 committed by Alexandre Julliard
parent c1b4d7d16f
commit 47fe880924
1 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
dlls/kernel/cpu.c
View File

@ -188,7 +188,8 @@ BOOL WINAPI QueryPerformanceCounter(PLARGE_INTEGER counter)
/* i586 optimized version */ /* i586 optimized version */
__asm__ __volatile__ ( "rdtsc" __asm__ __volatile__ ( "rdtsc"
: "=a" (counter->u.LowPart), "=d" (counter->u.HighPart) ); : "=a" (counter->u.LowPart), "=d" (counter->u.HighPart) );
counter->QuadPart = counter->QuadPart / 1000; /* see below */ /* see below */
counter->QuadPart = counter->QuadPart / ( cpuHz / 1193182 ) ;
return TRUE; return TRUE;
} }
#endif #endif
@ -219,10 +220,12 @@ BOOL WINAPI QueryPerformanceFrequency(PLARGE_INTEGER frequency)
{ {
#if defined(__i386__) && defined(__GNUC__) #if defined(__i386__) && defined(__GNUC__)
if (IsProcessorFeaturePresent( PF_RDTSC_INSTRUCTION_AVAILABLE )) { if (IsProcessorFeaturePresent( PF_RDTSC_INSTRUCTION_AVAILABLE )) {
/* The way Windows calculates this value is unclear, however simply using the CPU frequency /* On a standard PC, Windows returns the clock frequency for the
gives a value out by approximately a thousand. That can cause some applications to crash, * 8253 Programmable Interrupt Timer, which has been 1193182 Hz
so we divide here to make our number more similar to the one Windows gives */ * since the first IBM PC (cpuHz/4). There are applications that
frequency->QuadPart = cpuHz / 1000; * crash when the returned frequency is much higher or lower, so
* do not try to be smart */
frequency->QuadPart = 1193182;
return TRUE; return TRUE;
} }
#endif #endif