31 lines
571 B
C
31 lines
571 B
C
#include "cpusupport.h"
|
|
|
|
#ifdef CPUSUPPORT_X86_CPUID
|
|
#include <cpuid.h>
|
|
#endif
|
|
|
|
#define CPUID_SSE2_BIT (1 << 26)
|
|
|
|
CPUSUPPORT_FEATURE_DECL(x86, sse2)
|
|
{
|
|
#ifdef CPUSUPPORT_X86_CPUID
|
|
unsigned int eax, ebx, ecx, edx;
|
|
|
|
/* Check if CPUID supports the level we need. */
|
|
if (!__get_cpuid(0, &eax, &ebx, &ecx, &edx))
|
|
goto unsupported;
|
|
if (eax < 1)
|
|
goto unsupported;
|
|
|
|
/* Ask about CPU features. */
|
|
if (!__get_cpuid(1, &eax, &ebx, &ecx, &edx))
|
|
goto unsupported;
|
|
|
|
/* Return the relevant feature bit. */
|
|
return (edx & CPUID_SSE2_BIT);
|
|
|
|
unsupported:
|
|
#endif
|
|
return (0);
|
|
}
|