linux-kernel - Re: [PATCH] Display Intel Dynamic Acceleration feature in /proc/cpuinfo

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Date:	Fri, 25 May 2007 00:50:25 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Dave Jones <davej@...hat.com>
Cc:	"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

On Thu, 24 May 2007 18:41:54 -0400
Dave Jones <davej@...hat.com> 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.

The older AMD docs (CPU rev guide) list bit 31 of both 0x80000001 and
0x00000001 as 3dnow

All their example code/docs say to use 0x80000001 

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