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From: "Ahmed S. Darwish" <darwi@linutronix.de>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	x86@kernel.org, John Ogness <john.ogness@linutronix.de>,
	x86-cpuid@lists.linux.dev, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v1 10/12] tools/x86/kcpuid: Update bitfields to x86-cpuid-db v2.0
Date: Fri, 7 Mar 2025 16:07:04 +0100	[thread overview]
Message-ID: <Z8sLmGf2L4mszUEp@lx-t490> (raw)
In-Reply-To: <C7684E03-36E0-4D58-B6F0-78F4DB82D737@zytor.com>

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.

  reply	other threads:[~2025-03-07 15:07 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-03-06 20:49 [PATCH v1 00/12] tools/x86/kcpuid: x86-cpuid-db v2.2 update Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 01/12] tools/x86/kcpuid: Fix error handling Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 02/12] tools/x86/kcpuid: Remove unused local variable Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 03/12] tools/x86/kcpuid: Remove unused global variable Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 04/12] tools/x86/kcpuid: Simplify usage() handling Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 05/12] tools/x86/kcpuid: Refactor CPUID range handling for future expansion Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 06/12] tools/x86/kcpuid: Extend CPUID index mask macro Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 07/12] tools/x86/kcpuid: Add rudimentary CPU vendor detection Ahmed S. Darwish
2025-03-06 21:07   ` Andrew Cooper
2025-03-07 14:06     ` Ahmed S. Darwish
2025-03-06 22:00   ` Dave Hansen
2025-03-07 13:48     ` Ahmed S. Darwish
2025-03-07 15:46       ` H. Peter Anvin
2025-03-07 15:03   ` Dave Hansen
2025-03-10 14:21     ` Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 08/12] tools/x86/kcpuid: Restrict CPUID scanning to valid vendor ranges Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 09/12] tools/x86/kcpuid: Define Transmeta and Centaur index ranges Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 10/12] tools/x86/kcpuid: Update bitfields to x86-cpuid-db v2.0 Ahmed S. Darwish
2025-03-07  3:18   ` H. Peter Anvin
2025-03-07 15:07     ` Ahmed S. Darwish [this message]
2025-03-07 15:27       ` H. Peter Anvin
2025-03-10 14:47         ` Ahmed S. Darwish
2025-03-06 20:49 ` [PATCH v1 11/12] tools/x86/kcpuid: Update bitfields to x86-cpuid-db v2.2 Ahmed S. Darwish
2025-03-06 20:50 ` [PATCH v1 12/12] MAINTAINERS: Include kcpuid under X86 CPUID DATABASE Ahmed S. Darwish

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