On Sun, May 19, 2019 at 7:31 AM Olaf van der Spek <ml@xxxxxxxxxx> 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
