The code in question:
void cpuid(unsigned info, unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned
*edx)
{
#ifdef __GNUC__
#if defined(__i386__) || defined(__x86_64__)
*eax = info;
__asm volatile
("mov %%ebx, %%edi;" /* 32bit PIC: don't clobber ebx */
"cpuid;"
"mov %%ebx, %%esi;"
"mov %%edi, %%ebx;"
:"+a" (*eax), "=S" (*ebx), "=c" (*ecx), "=d" (*edx)
: :"edi");
#endif
#endif
}
On 64-bit systems upper half of %rbx gets clobbered, because only %ebx is
preserved via %edi.
--
Andriy Gapon
------------------------------------------------------------------------------
Virtualization & Cloud Management Using Capacity Planning
Cloud computing makes use of virtualization - but cloud computing
also focuses on allowing computing to be delivered as a service.
http://www.accelacomm.com/jaw/sfnl/114/51521223/
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