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RE: Bug fix to /proc/cpuinfo implementation
- From: "Chris January" <chris at atomice dot net>
- To: <cygwin at cygwin dot com>
- Date: Wed, 23 Jun 2004 18:07:16 +0100
- Subject: RE: Bug fix to /proc/cpuinfo implementation
> Hi
>
> I hope I email to correct mailing list...
>
> It seems that '/proc/cpuinfo' doesn't report 3dnow and
> 3dnowext support correctly.
>
> Because I had been using it for recognizing processor
> features I looked briefly into fhandler_proc.cc (taken
> freshly from cvs) and I think I fixed the problem. The
> changed file compiles and *should* correctly detect presence
> of 3dnow instruction support (by using AMD's 0x8000..1
> extended function). I haven't have time to test it (= figure out how
> build+install process actually works) because I decided to
> write my own
> cpuid detection routines from scratch instead.
Actually nearly all of the processor feature flags are wrong for AMD
processors. This is a known bug. Your patch looks to be going about the
right way to fix it. I'll try to add the rest of the AMD flags in.
Chris
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