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Author: Andreas Beckmann <anbe@debian.org>
Description: fix cpuid inline assembly
the old code zeroed the upper half of %rbx
--- a/helper_functions.c
+++ b/helper_functions.c
@@ -101,13 +101,7 @@ static inline void cpuid (unsigned int i
unsigned int *ecx, unsigned int *edx)
{
unsigned int _eax = info, _ebx, _ecx, _edx;
- asm volatile ("mov %%ebx, %%edi;" // save ebx (for PIC)
- "cpuid;"
- "mov %%ebx, %%esi;" // pass to caller
- "mov %%edi, %%ebx;" // restore ebx
- :"+a" (_eax), "=S" (_ebx), "=c" (_ecx), "=d" (_edx)
- : /* inputs: eax is handled above */
- :"edi" /* clobbers: we hit edi directly */);
+ asm volatile ("cpuid\n\t" : "+a" (_eax), "=b" (_ebx), "=c" (_ecx), "=d" (_edx) : : );
if (eax) *eax = _eax;
if (ebx) *ebx = _ebx;
if (ecx) *ecx = _ecx;
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