Re: [PATCH v1 10/12] tools/x86/kcpuid: Update bitfields to x86-cpuid-db v2.0

[Ahmed S. Darwish]

On Thu, 06 Mar 2025, H. Peter Anvin wrote:
>
> Leaf 3h was not unique to Transmeta.
>

Thanks, I missed that Pentium III can provide leaf 0x3 as well.

It seems that leaf 0x3's format differs between Intel and Transmeta.  On
Intel, PSN is at ECX:EDX, while on Transmeta, the PSN is at EAX:EBX, and
ECX:EDX on non-evaluation models provide the rest. [*]

Unfortunately, so far, x86-cpuid-db does not support having a CPUID
bitfield with different interpretations across vendors.

Given that Linux force disables PSN at early boot, I'll just remove that
leaf from the database — for now.  (Time wise, finishing the new
linux/arch/x86/ CPUID data model for mainline submission is a much higher
priority.)

All the best,
Ahmed

[*] "Processor Recognition", Transmeta Corporation, 2002/05/07.