On Sun, May 19, 2019 at 7:31 AM Olaf van der Spek <m...@vdspek.org> wrote:
>
> What's eax after cpuid function 0?

After calling cpuid function 0x0, %eax returns the expected 0x1.

Here is the output of 'cpuid -r'.

# cpuid -r
CPU 0:
   0x00000000 0x00: eax=0x00000001 ebx=0x746e6543 ecx=0x736c7561 edx=0x48727561
   0x00000001 0x00: eax=0x00000585 ebx=0x746e6543 ecx=0x00000000 edx=0x008001b5
   0x80000000 0x00: eax=0x80000005 ebx=0x00000000 ecx=0x00000000 edx=0x00000050
   0x80000001 0x00: eax=0x00000585 ebx=0x00000000 ecx=0x00000000 edx=0x808001b5
   0x80000002 0x00: eax=0x20544449 ebx=0x436e6957 ecx=0x20706968 edx=0x44332d32
   0x80000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
   0x80000004 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
   0x80000005 0x00: eax=0x80000005 ebx=0x08800880 ecx=0x20040120 edx=0x20020120
   0x80860000 0x00: eax=0x80860000 ebx=0x08800880 ecx=0x00000000 edx=0x00000050
   0xc0000000 0x00: eax=0xc0000005 ebx=0x08800880 ecx=0x00000000 edx=0x00000050
   0xc0000001 0x00: eax=0x00000585 ebx=0x08800880 ecx=0x00000000 edx=0x808001b5
   0xc0000002 0x00: eax=0x20544449 ebx=0x436e6957 ecx=0x20706968 edx=0x44332d32
   0xc0000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
   0xc0000004 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
   0xc0000005 0x00: eax=0xc0000005 ebx=0x08800880 ecx=0x20040120 edx=0x20020120

- Matthew


- Matthew
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