k8 cpu rev

[YhLu]

northbridge/amd/amdk8/cpu_rev.c

static int is_cpu_pre_c0(void)
{
        return (cpuid_eax(1) & 0xffef) < 0x0f48;
}

Why need to and 0xffef?

YH

YhLu  writes:
> northbridge/amd/amdk8/cpu_rev.c
>
> static int is_cpu_pre_c0(void)
> {
>         return (cpuid_eax(1) & 0xffef) < 0x0f48;
> }
>
> Why need to and 0xffef?

Look at the various cpuid values that happen to be c0 stepping
processors.

Eric