Steffen Winterfeldt wrote...
> On Wed, 18 Jan 2012, Christoph Biedl wrote:
>
> >Steffen Winterfeldt wrote...
> >
> >>Thanks! But shouldn't it be 'mov %%rbx,%%rdi' etc, then?
> >
> >Hm, why? cpuid affects only the lower 32 Bits. Using %rbx instead
> >shouldn't do harm, though.
>
> No, the result is zero-extended to 64 bits in 64bit-mode.
I stand corrected.
(Call me Thomas, I wanted to see that with my own eye, this took a
while, sorry about that.)
By the way, I am quite confused by the fact
cpuid with %eax set to 0 returns the ID in %ebx,%edx,%ecx
while
cpuid with %eax set to 0x40000000 appearently returns, if running
under xen, the ID in %ebx,%ecx,%edx, read: With %ecx and %edx in
swapped order.
Mind of you double-check your code does the right thing unless you've
already done so? I don't have a Xen installation at hand to do this,
they crashed or did other nasty things every time I've tried in the
past six years.
Christoph
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