Re: [PATCH v4 1/4] x86/cpu/topology: Use initial APIC ID from XTOPOLOGY leaf on AMD/HYGON

[K Prateek Nayak]

On 8/25/2025 1:27 PM, K Prateek Nayak wrote:
> AMD64 Architecture Programmer's Manual Volume 2: System Programming Pub.
> 24593 Rev. 3.42 [2] Section 16.12 "x2APIC_ID" mentions the Extended
> Enumeration leaf 0x8000001e (which was later superseded by the extended

The above should have been CPUID leaf 0xb (Fn0000_000B_EDX[31:0]) and
not 0x8000001e. Sorry for the oversight.

> leaf 0x80000026) provides the full x2APIC ID under all circumstances
> unlike the one reported by CPUID leaf 0x8000001e EAX which depends on
> the mode in which APIC is configured.
-- 
Thanks and Regards,
Prateek