| 1 | #include "cpusupport.h" |
| 2 | |
| 3 | #ifdef CPUSUPPORT_X86_CPUID |
| 4 | #include <cpuid.h> |
| 5 | |
| 6 | #define CPUID_SSE2_BIT (1 << 26) |
| 7 | #endif |
| 8 | |
| 9 | CPUSUPPORT_FEATURE_DECL(x86, sse2) |
| 10 | { |
| 11 | #ifdef CPUSUPPORT_X86_CPUID |
| 12 | unsigned int eax, ebx, ecx, edx; |
| 13 | |
| 14 | /* Check if CPUID supports the level we need. */ |
| 15 | if (!__get_cpuid(0, &eax, &ebx, &ecx, &edx)) |
| 16 | goto unsupported; |
| 17 | if (eax < 1) |
| 18 | goto unsupported; |
| 19 | |
| 20 | /* Ask about CPU features. */ |
| 21 | if (!__get_cpuid(1, &eax, &ebx, &ecx, &edx)) |
| 22 | goto unsupported; |
| 23 | |
| 24 | /* Return the relevant feature bit. */ |
| 25 | return ((edx & CPUID_SSE2_BIT) ? 1 : 0); |
| 26 | |
| 27 | unsupported: |
| 28 | #endif |
| 29 | return (0); |
| 30 | } |