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114 lines
3.5 KiB
114 lines
3.5 KiB
/* Cpu detection code, extracted from mmx.h ((c)1997-99 by H. Dietz |
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and R. Fisher). Converted to C and improved by Gerard Lantau */ |
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#include <stdlib.h> |
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#include "../dsputil.h" |
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/* ebx saving is necessary for PIC. gcc seems unable to see it alone */ |
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#define cpuid(index,eax,ebx,ecx,edx)\ |
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__asm __volatile\ |
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("movl %%ebx, %%esi\n\t"\ |
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"cpuid\n\t"\ |
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"xchgl %%ebx, %%esi"\ |
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: "=a" (eax), "=S" (ebx),\ |
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"=c" (ecx), "=d" (edx)\ |
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: "0" (index)); |
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/* Function to test if multimedia instructions are supported... */ |
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int mm_support(void) |
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{ |
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int rval; |
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int eax, ebx, ecx, edx; |
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__asm__ __volatile__ ( |
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/* See if CPUID instruction is supported ... */ |
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/* ... Get copies of EFLAGS into eax and ecx */ |
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"pushf\n\t" |
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"popl %0\n\t" |
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"movl %0, %1\n\t" |
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|
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/* ... Toggle the ID bit in one copy and store */ |
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/* to the EFLAGS reg */ |
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"xorl $0x200000, %0\n\t" |
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"push %0\n\t" |
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"popf\n\t" |
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/* ... Get the (hopefully modified) EFLAGS */ |
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"pushf\n\t" |
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"popl %0\n\t" |
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: "=a" (eax), "=c" (ecx) |
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: |
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: "cc" |
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); |
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if (eax == ecx) |
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return 0; /* CPUID not supported */ |
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cpuid(0, eax, ebx, ecx, edx); |
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if (ebx == 0x756e6547 && |
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edx == 0x49656e69 && |
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ecx == 0x6c65746e) { |
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/* intel */ |
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inteltest: |
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cpuid(1, eax, ebx, ecx, edx); |
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if ((edx & 0x00800000) == 0) |
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return 0; |
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rval = MM_MMX; |
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if (edx & 0x02000000) |
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rval |= MM_MMXEXT | MM_SSE; |
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if (edx & 0x04000000) |
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rval |= MM_SSE2; |
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return rval; |
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} else if (ebx == 0x68747541 && |
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edx == 0x69746e65 && |
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ecx == 0x444d4163) { |
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/* AMD */ |
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cpuid(0x80000000, eax, ebx, ecx, edx); |
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if ((unsigned)eax < 0x80000001) |
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goto inteltest; |
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cpuid(0x80000001, eax, ebx, ecx, edx); |
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if ((edx & 0x00800000) == 0) |
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return 0; |
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rval = MM_MMX; |
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if (edx & 0x80000000) |
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rval |= MM_3DNOW; |
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if (edx & 0x00400000) |
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rval |= MM_MMXEXT; |
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return rval; |
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} else if (ebx == 0x69727943 && |
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edx == 0x736e4978 && |
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ecx == 0x64616574) { |
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/* Cyrix Section */ |
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/* See if extended CPUID level 80000001 is supported */ |
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/* The value of CPUID/80000001 for the 6x86MX is undefined |
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according to the Cyrix CPU Detection Guide (Preliminary |
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Rev. 1.01 table 1), so we'll check the value of eax for |
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CPUID/0 to see if standard CPUID level 2 is supported. |
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According to the table, the only CPU which supports level |
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2 is also the only one which supports extended CPUID levels. |
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*/ |
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if (eax != 2) |
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goto inteltest; |
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cpuid(0x80000001, eax, ebx, ecx, edx); |
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if ((eax & 0x00800000) == 0) |
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return 0; |
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rval = MM_MMX; |
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if (eax & 0x01000000) |
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rval |= MM_MMXEXT; |
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return rval; |
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} else { |
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return 0; |
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} |
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} |
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#ifdef __TEST__ |
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int main ( void ) |
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{ |
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int mm_flags; |
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mm_flags = mm_support(); |
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printf("mm_support = 0x%08u\n",mm_flags); |
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return 0; |
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} |
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#endif
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