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    SubjectRe: [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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