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