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Date:	Thu, 24 May 2007 15:51:31 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Jones <davej@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Len Brown <len.brown@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH] Display Intel Dynamic Acceleration feature in /proc/cpuinfo

Dave Jones wrote:
> On Thu, May 24, 2007 at 03:14:39PM -0700, H. Peter Anvin wrote:
> 
>  > pbe collides with abuse by at least two vendors (AMD and
>  > Cyrix/Centaur/VIA) of this bit for 3DNow.
> 
> Unless I'm mistaken,
> 
> pbe comes from cpuid level 1
> 
> 3dnow comes from cpuid level 0x80000001
> though I did notice that amd have it in edx, whilst via have it in ecx
> curiously.

edx is correct.

What you're describing is correct for later-level AMD/Cyrix chips,
however, when 3DNow! was first introduced they foolishly squatted on the
Intel-assigned CPUID flags.

However, I have audited all the vendor initialization paths, and we kill
off that CPUID bit in all the places that matter.

	-hpa
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