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- /*
- Copyright (C) 1997-2001 Id Software, Inc.
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 2
- of the License, or (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- See the GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
- #include <stdlib.h>
- #include "client.h"
- #if id386
- static unsigned long bias;
- static unsigned long *histogram;
- static unsigned long start, range;
- static unsigned long bias;
- __declspec( naked ) void x86_TimerStart( void )
- {
- __asm _emit 0fh
- __asm _emit 31h
- __asm mov start, eax
- __asm ret
- }
- __declspec( naked ) void x86_TimerStop( void )
- {
- __asm push edi
- __asm mov edi, histogram
- __asm _emit 0fh
- __asm _emit 31h
- __asm sub eax, start
- __asm sub eax, bias
- __asm js discard
- __asm cmp eax, range
- __asm jge discard
- __asm lea edi, [edi + eax*4]
- __asm inc dword ptr [edi]
- discard:
- __asm pop edi
- __asm ret
- }
- #pragma warning( disable: 4035 )
- static __declspec( naked ) unsigned long x86_TimerStopBias( void )
- {
- __asm push edi
- __asm mov edi, histogram
- __asm _emit 0fh
- __asm _emit 31h
- __asm sub eax, start
- __asm pop edi
- __asm ret
- }
- #pragma warning( default:4035 )
- void x86_TimerInit( unsigned long smallest, unsigned length )
- {
- int i;
- unsigned long biastable[100];
- range = length;
- bias = 10000;
- for ( i = 0; i < 100; i++ )
- {
- x86_TimerStart();
- biastable[i] = x86_TimerStopBias();
- if ( bias > biastable[i] )
- bias = biastable[i];
- }
- bias += smallest;
- histogram = Z_Malloc( range * sizeof( unsigned long ) );
- }
- unsigned long *x86_TimerGetHistogram( void )
- {
- return histogram;
- }
- #endif
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