linux-kernel - RE: [PATCH 10/10] x86-32: panic on !CX8 && XMM

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Message-ID: <SNT125-W43CEC942D4248B42CA7B1DC3470@phx.gbl>
Date:	Wed, 17 Feb 2010 17:13:23 -0800
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<hpa@...or.com>
CC:	<luca@...a-barbieri.com>, <mingo@...e.hu>,
	<a.p.zijlstra@...llo.nl>, <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 10/10] x86-32: panic on !CX8 && XMM

>> Also, don't forget the NT4 CX8 bug with non-Intel/AMD/Cyrix vendors:
>> http://www.geoffchappell.com/studies/windows/km/cpu/cx8.htm
>> If a processor support SSE (or PAE or MMX for that matter), you can pretty much assume CX8 exists even if the feature bit is cleared because of this bug.
>>
>
> Those kinds of things we *also* deal with by adjusting the CPU features
> in the detection code.

And in fact, the Linux setup code already has code similar to the code used in XP to disable this NT4 workaround.

Yuhong Bao

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