[authen-passphrase-scrypt.git] / scrypt-1.2.1 / libcperciva / cpusupport / cpusupport_x86_aesni.c

#include "cpusupport.h"

#ifdef CPUSUPPORT_X86_CPUID
#include <cpuid.h>

#define CPUID_AESNI_BIT (1 << 25)
#endif

CPUSUPPORT_FEATURE_DECL(x86, aesni)
{
#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 ((ecx & CPUID_AESNI_BIT) ? 1 : 0);

unsupported:
#endif
	return (0);
}
Commit	Line	Data
0c1f3509 MG	1	#include "cpusupport.h"
	2
	3	#ifdef CPUSUPPORT_X86_CPUID
	4	#include <cpuid.h>
	5
	6	#define CPUID_AESNI_BIT (1 << 25)
	7	#endif
	8
	9	CPUSUPPORT_FEATURE_DECL(x86, aesni)
	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 ((ecx & CPUID_AESNI_BIT) ? 1 : 0);
	26
	27	unsupported:
	28	#endif
	29	return (0);
	30	}