1/* 2 * CPU detection code, extracted from mmx.h 3 * (c)1997-99 by H. Dietz and R. Fisher 4 * Converted to C and improved by Fabrice Bellard. 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include <stdlib.h> 24#include "libavutil/x86_cpu.h" 25#include "libavcodec/dsputil.h" 26 27#undef printf 28 29/* ebx saving is necessary for PIC. gcc seems unable to see it alone */ 30#define cpuid(index,eax,ebx,ecx,edx)\ 31 __asm__ volatile\ 32 ("mov %%"REG_b", %%"REG_S"\n\t"\ 33 "cpuid\n\t"\ 34 "xchg %%"REG_b", %%"REG_S\ 35 : "=a" (eax), "=S" (ebx),\ 36 "=c" (ecx), "=d" (edx)\ 37 : "0" (index)); 38 39/* Function to test if multimedia instructions are supported... */ 40int mm_support(void) 41{ 42 int rval = 0; 43 int eax, ebx, ecx, edx; 44 int max_std_level, max_ext_level, std_caps=0, ext_caps=0; 45 46#if ARCH_X86_32 47 x86_reg a, c; 48 __asm__ volatile ( 49 /* See if CPUID instruction is supported ... */ 50 /* ... Get copies of EFLAGS into eax and ecx */ 51 "pushfl\n\t" 52 "pop %0\n\t" 53 "mov %0, %1\n\t" 54 55 /* ... Toggle the ID bit in one copy and store */ 56 /* to the EFLAGS reg */ 57 "xor $0x200000, %0\n\t" 58 "push %0\n\t" 59 "popfl\n\t" 60 61 /* ... Get the (hopefully modified) EFLAGS */ 62 "pushfl\n\t" 63 "pop %0\n\t" 64 : "=a" (a), "=c" (c) 65 : 66 : "cc" 67 ); 68 69 if (a == c) 70 return 0; /* CPUID not supported */ 71#endif 72 73 cpuid(0, max_std_level, ebx, ecx, edx); 74 75 if(max_std_level >= 1){ 76 cpuid(1, eax, ebx, ecx, std_caps); 77 if (std_caps & (1<<23)) 78 rval |= FF_MM_MMX; 79 if (std_caps & (1<<25)) 80 rval |= FF_MM_MMXEXT 81#if HAVE_SSE 82 | FF_MM_SSE; 83 if (std_caps & (1<<26)) 84 rval |= FF_MM_SSE2; 85 if (ecx & 1) 86 rval |= FF_MM_SSE3; 87 if (ecx & 0x00000200 ) 88 rval |= FF_MM_SSSE3 89#endif 90 ; 91 } 92 93 cpuid(0x80000000, max_ext_level, ebx, ecx, edx); 94 95 if(max_ext_level >= 0x80000001){ 96 cpuid(0x80000001, eax, ebx, ecx, ext_caps); 97 if (ext_caps & (1<<31)) 98 rval |= FF_MM_3DNOW; 99 if (ext_caps & (1<<30)) 100 rval |= FF_MM_3DNOWEXT; 101 if (ext_caps & (1<<23)) 102 rval |= FF_MM_MMX; 103 if (ext_caps & (1<<22)) 104 rval |= FF_MM_MMXEXT; 105 } 106 107#if 0 108 av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s%s%s\n", 109 (rval&FF_MM_MMX) ? "MMX ":"", 110 (rval&FF_MM_MMXEXT) ? "MMX2 ":"", 111 (rval&FF_MM_SSE) ? "SSE ":"", 112 (rval&FF_MM_SSE2) ? "SSE2 ":"", 113 (rval&FF_MM_SSE3) ? "SSE3 ":"", 114 (rval&FF_MM_SSSE3) ? "SSSE3 ":"", 115 (rval&FF_MM_3DNOW) ? "3DNow ":"", 116 (rval&FF_MM_3DNOWEXT) ? "3DNowExt ":""); 117#endif 118 return rval; 119} 120 121#ifdef TEST 122int main ( void ) 123{ 124 int mm_flags; 125 mm_flags = mm_support(); 126 printf("mm_support = 0x%08X\n",mm_flags); 127 return 0; 128} 129#endif 130