106 lines
2.3 KiB
C
Executable File
106 lines
2.3 KiB
C
Executable File
#include <stdbool.h>
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#include "cpu_features.h"
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/* level 1 edx bits */
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#define EDX_CX8 (1 << 8) /* CMPXCHG8B */
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#define EDX_CMOV (1 << 15)
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#define EDX_MMX (1 << 23)
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#define EDX_FXSR (1 << 24) /* FXSAVE and FXRSTOR */
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#define EDX_SSE (1 << 25)
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#define EDX_SSE2 (1 << 26)
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/* level 1 ecx bits */
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#define ECX_SSE3 (1 << 0)
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#define ECX_CX16 (1 << 13) /* CMPXCHG16B */
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/* extended level 0x80000001 edx bits */
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#define EDX_3DNOW (1 << 31)
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#define EDX_3DNOWP (1 << 30)
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#define EDX_LM (1 << 29) /*LONG MODE */
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#define __cpuid(level,a,b,c,d) \
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asm volatile ("cpuid;" \
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: "=a" (a), "=b" (b), "=c" (c), "=d" (d)\
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: "0" (level))
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/* Combine the different cpuid flags into a single bitmap. */
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unsigned int __cpu_features = 0;
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void __cpu_features_init (void)
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{
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unsigned int eax, ebx, ecx, edx;
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/* Try to change the value of CPUID bit (bit 21) in EFLAGS.
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If the bit can be toggled, CPUID is supported. */
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asm volatile ("pushfl; pushfl; popl %0;"
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"movl %0,%1; xorl %2,%0;"
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"pushl %0; popfl; pushfl; popl %0; popfl"
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: "=&r" (eax), "=&r" (ebx)
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: "i" (0x00200000));
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if (((eax ^ ebx) & 0x00200000) == 0)
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return;
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__cpuid (0, eax, ebx, ecx, edx);
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if (eax == 0)
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return;
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__cpuid (1, eax, ebx, ecx, edx);
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if (edx & EDX_CX8)
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__cpu_features |= _CRT_CMPXCHG8B;
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if (edx & EDX_CMOV)
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__cpu_features |= _CRT_CMOV;
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if (edx & EDX_MMX)
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__cpu_features |= _CRT_MMX;
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if (edx & EDX_FXSR)
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__cpu_features |= _CRT_FXSR;
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if (edx & EDX_SSE)
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__cpu_features |= _CRT_SSE;
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if (edx & EDX_SSE2)
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__cpu_features |= _CRT_SSE2;
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if (ecx & ECX_SSE3)
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__cpu_features |= _CRT_SSE3;
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if (ecx & ECX_CX16)
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__cpu_features |= _CRT_CMPXCHG16B;
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__cpuid (0x80000000, eax, ebx, ecx, edx);
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if (eax < 0x80000001)
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return;
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__cpuid (0x80000001, eax, ebx, ecx, edx);
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if (edx & EDX_3DNOW)
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__cpu_features |= _CRT_3DNOW;
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if (edx & EDX_3DNOWP)
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__cpu_features |= _CRT_3DNOWP;
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return;
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}
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#ifdef TEST
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#include <stdio.h>
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#define report(feature) \
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if ((feature) & __cpu_features) printf( #feature " found\n")
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int main()
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{
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__cpu_features_init();
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report(_CRT_CMPXCHG8B);
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report(_CRT_CMOV);
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report(_CRT_MMX);
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report(_CRT_FXSR);
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report(_CRT_SSE);
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report(_CRT_SSE2);
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report(_CRT_SSE3);
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report(_CRT_CMPXCHG16B);
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report(_CRT_3DNOW);
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report(_CRT_3DNOWP);
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return 0;
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}
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#endif
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