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