| 1 | /* Cpu detection code, extracted from mmx.h ((c)1997-99 by H. Dietz
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| 2 | and R. Fisher). Converted to C and improved by Fabrice Bellard */
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| 3 |
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| 4 | #include <stdlib.h>
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| 5 | #include "../dsputil.h"
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| 6 |
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| 7 | #ifdef ARCH_X86_64
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| 8 | # define REG_b "rbx"
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| 9 | # define REG_S "rsi"
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| 10 | #else
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| 11 | # define REG_b "ebx"
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| 12 | # define REG_S "esi"
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| 13 | #endif
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| 14 |
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| 15 | /* ebx saving is necessary for PIC. gcc seems unable to see it alone */
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| 16 | #define cpuid(index,eax,ebx,ecx,edx)\
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| 17 | __asm __volatile\
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| 18 | ("mov %%"REG_b", %%"REG_S"\n\t"\
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| 19 | "cpuid\n\t"\
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| 20 | "xchg %%"REG_b", %%"REG_S\
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| 21 | : "=a" (eax), "=S" (ebx),\
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| 22 | "=c" (ecx), "=d" (edx)\
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| 23 | : "0" (index));
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| 24 |
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| 25 | /* Function to test if multimedia instructions are supported... */
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| 26 | int mm_support(void)
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| 27 | {
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| 28 | int rval = 0;
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| 29 | int eax, ebx, ecx, edx;
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| 30 | int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
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| 31 | long a, c;
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| 32 |
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| 33 | __asm__ __volatile__ (
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| 34 | /* See if CPUID instruction is supported ... */
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| 35 | /* ... Get copies of EFLAGS into eax and ecx */
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| 36 | "pushf\n\t"
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| 37 | "pop %0\n\t"
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| 38 | "mov %0, %1\n\t"
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| 39 |
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| 40 | /* ... Toggle the ID bit in one copy and store */
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| 41 | /* to the EFLAGS reg */
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| 42 | "xor $0x200000, %0\n\t"
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| 43 | "push %0\n\t"
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| 44 | "popf\n\t"
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| 45 |
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| 46 | /* ... Get the (hopefully modified) EFLAGS */
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| 47 | "pushf\n\t"
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| 48 | "pop %0\n\t"
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| 49 | : "=a" (a), "=c" (c)
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| 50 | :
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| 51 | : "cc"
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| 52 | );
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| 53 |
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| 54 | if (a == c)
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| 55 | return 0; /* CPUID not supported */
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| 56 |
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| 57 | cpuid(0, max_std_level, ebx, ecx, edx);
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| 58 |
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| 59 | if(max_std_level >= 1){
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| 60 | cpuid(1, eax, ebx, ecx, std_caps);
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| 61 | if (std_caps & (1<<23))
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| 62 | rval |= MM_MMX;
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| 63 | if (std_caps & (1<<25))
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| 64 | rval |= MM_MMXEXT | MM_SSE;
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| 65 | if (std_caps & (1<<26))
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| 66 | rval |= MM_SSE2;
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| 67 | if (ecx & 1)
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| 68 | rval |= MM_SSE3;
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| 69 | }
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| 70 |
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| 71 | cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
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| 72 |
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| 73 | if(max_ext_level >= 0x80000001){
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| 74 | cpuid(0x80000001, eax, ebx, ecx, ext_caps);
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| 75 | if (ext_caps & (1<<31))
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| 76 | rval |= MM_3DNOW;
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| 77 | if (ext_caps & (1<<30))
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| 78 | rval |= MM_3DNOWEXT;
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| 79 | if (ext_caps & (1<<23))
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| 80 | rval |= MM_MMX;
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| 81 | if (ext_caps & (1<<22))
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| 82 | rval |= MM_MMXEXT;
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| 83 | }
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| 84 |
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| 85 | #if 0
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| 86 | av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s\n",
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| 87 | (rval&MM_MMX) ? "MMX ":"",
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| 88 | (rval&MM_MMXEXT) ? "MMX2 ":"",
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| 89 | (rval&MM_SSE) ? "SSE ":"",
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| 90 | (rval&MM_SSE2) ? "SSE2 ":"",
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| 91 | (rval&MM_3DNOW) ? "3DNow ":"",
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| 92 | (rval&MM_3DNOWEXT) ? "3DNowExt ":"");
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| 93 | #endif
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| 94 | return rval;
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| 95 | }
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| 96 |
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| 97 | #ifdef __TEST__
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| 98 | int main ( void )
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| 99 | {
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| 100 | int mm_flags;
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| 101 | mm_flags = mm_support();
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| 102 | printf("mm_support = 0x%08X\n",mm_flags);
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| 103 | return 0;
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| 104 | }
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| 105 | #endif
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