From: "H. Peter Anvin" <hpa@zytor.com>
To: Dave Jones <davej@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
Venki Pallipadi <venkatesh.pallipadi@intel.com>,
Len Brown <len.brown@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Andi Kleen <ak@suse.de>
Subject: Re: [PATCH] Display Intel Dynamic Acceleration feature in /proc/cpuinfo
Date: Thu, 24 May 2007 15:51:31 -0700 [thread overview]
Message-ID: <465616F3.6090501@zytor.com> (raw)
In-Reply-To: <20070524224154.GA29337@redhat.com>
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
next prev parent reply other threads:[~2007-05-24 22:52 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-23 22:46 [PATCH] Display Intel Dynamic Acceleration feature in /proc/cpuinfo Venki Pallipadi
2007-05-24 20:55 ` Andrew Morton
2007-05-24 21:01 ` Dave Jones
2007-05-24 21:08 ` Andi Kleen
2007-05-24 21:13 ` Venki Pallipadi
2007-05-24 21:25 ` Andi Kleen
2007-05-24 21:28 ` Venki Pallipadi
2007-05-24 21:37 ` Dave Jones
2007-05-24 21:56 ` Andi Kleen
2007-05-24 23:03 ` H. Peter Anvin
2007-05-24 23:13 ` Pallipadi, Venkatesh
2007-05-24 23:23 ` H. Peter Anvin
2007-05-25 0:00 ` Pallipadi, Venkatesh
2007-05-25 0:04 ` H. Peter Anvin
2007-05-30 0:52 ` Venki Pallipadi
2007-05-24 21:10 ` Venki Pallipadi
2007-05-24 22:02 ` Andrew Morton
2007-05-24 22:08 ` Venki Pallipadi
2007-05-24 22:16 ` H. Peter Anvin
2007-05-24 22:14 ` H. Peter Anvin
2007-05-24 22:41 ` Dave Jones
2007-05-24 22:51 ` H. Peter Anvin [this message]
2007-05-24 23:06 ` Dave Jones
2007-05-24 23:11 ` H. Peter Anvin
2007-05-24 23:50 ` Alan Cox
2007-05-24 23:53 ` H. Peter Anvin
2007-05-24 22:27 ` H. Peter Anvin
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