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/*
* Copyright (c) 2012-2013 The Chromium OS Authors. All rights reserved.
*
* Licensed under the BSD 3-clause.
*/
#ifndef __LTP_CPUID_H__
#define __LTP_CPUID_H__
static inline void cpuid(unsigned int info, unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
#if defined(__i386__) || defined(__x86_64__)
unsigned int _eax = info, _ebx, _ecx, _edx;
asm volatile(
# ifdef __i386__
"xchg %%ebx, %%esi;" /* save ebx (for PIC) */
"cpuid;"
"xchg %%esi, %%ebx;" /* restore ebx & pass to caller */
: "=S" (_ebx),
# else
"cpuid;"
: "=b" (_ebx),
# endif
"+a" (_eax), "=c" (_ecx), "=d" (_edx)
: /* inputs: eax is handled above */
);
if (eax) *eax = _eax;
if (ebx) *ebx = _ebx;
if (ecx) *ecx = _ecx;
if (edx) *edx = _edx;
#endif
}
#endif
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