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Annotation of quake2/client/x86.c, revision 1.1.1.2

1.1.1.2 ! root        1: /*
        !             2: Copyright (C) 1997-2001 Id Software, Inc.
        !             3: 
        !             4: This program is free software; you can redistribute it and/or
        !             5: modify it under the terms of the GNU General Public License
        !             6: as published by the Free Software Foundation; either version 2
        !             7: of the License, or (at your option) any later version.
        !             8: 
        !             9: This program is distributed in the hope that it will be useful,
        !            10: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
        !            12: 
        !            13: See the GNU General Public License for more details.
        !            14: 
        !            15: You should have received a copy of the GNU General Public License
        !            16: along with this program; if not, write to the Free Software
        !            17: Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
        !            18: 
        !            19: */
1.1       root       20: #include <stdlib.h>
                     21: #include "client.h"
                     22: 
                     23: #if id386
                     24: 
                     25: static unsigned long bias;
                     26: static unsigned long *histogram;
                     27: static unsigned long start, range;
                     28: static unsigned long bias;
                     29: 
                     30: __declspec( naked ) void x86_TimerStart( void )
                     31: {
                     32:        __asm _emit 0fh
                     33:        __asm _emit 31h
                     34:        __asm mov  start, eax
                     35:        __asm ret
                     36: }
                     37: 
                     38: __declspec( naked ) void x86_TimerStop( void )
                     39: {
                     40:        __asm push edi
                     41:        __asm mov edi, histogram
                     42:        __asm _emit 0fh
                     43:        __asm _emit 31h
                     44:        __asm sub eax, start
                     45:        __asm sub eax, bias
                     46:        __asm js discard
                     47:        __asm cmp eax, range
                     48:        __asm jge  discard
                     49:        __asm lea edi, [edi + eax*4]
                     50:        __asm inc dword ptr [edi]
                     51: discard:
                     52:        __asm pop edi
                     53:        __asm ret
                     54: }
                     55: 
                     56: #pragma warning( disable: 4035 )
                     57: static __declspec( naked ) unsigned long x86_TimerStopBias( void )
                     58: {
                     59:        __asm push edi
                     60:        __asm mov edi, histogram
                     61:        __asm _emit 0fh
                     62:        __asm _emit 31h
                     63:        __asm sub eax, start
                     64:        __asm pop edi
                     65:        __asm ret
                     66: }
                     67: #pragma warning( default:4035 )
                     68: 
                     69: void x86_TimerInit( unsigned long smallest, unsigned length )
                     70: {
                     71:        int i;
                     72:        unsigned long biastable[100];
                     73: 
                     74:        range = length;
                     75:        bias = 10000;
                     76: 
                     77:        for ( i = 0; i < 100; i++ )
                     78:        {
                     79:                x86_TimerStart();
                     80:                biastable[i] = x86_TimerStopBias();
                     81: 
                     82:                if ( bias > biastable[i] )
                     83:                        bias = biastable[i];
                     84:        }
                     85: 
                     86:        bias += smallest;
                     87:        histogram = Z_Malloc( range * sizeof( unsigned long ) );
                     88: }
                     89: 
                     90: unsigned long *x86_TimerGetHistogram( void )
                     91: {
                     92:        return histogram;
                     93: }
                     94: 
                     95: #endif

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