| /* |
| * 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 |
