On 9/11/2025 10:07 AM, K Prateek Nayak wrote:
> /*
> - * In case leaf B is available, use it to derive
> - * topology information.
> + * If the extended topology leaf 0xb leaf doesn't exits,
> + * derive CORE and DIE information from the 0x8000001e leaf.
> */
> - err = detect_extended_topology(c);
> - if (!err)
> - c->x86_coreid_bits = get_count_order(c->x86_max_cores);
> + if (!has_extended_topology) {
> + c->cpu_die_id = ecx & 0xff;
Just noticed that we still need that "cpu_die_id" from 0x8000001e since
0xb on AMD does not implement the LEVEL_TYPE of DIE_TYPE (5).
> +
> + if (c->x86 >= 0x17) {
> + c->cpu_core_id = ebx & 0xff;
> +
> + if (smp_num_siblings > 1)
> + c->x86_max_cores /= smp_num_siblings;
> + }
> + }
--
Thanks and Regards,
Prateek
