73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
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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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__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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