RE: NexGen detection

From: Maciej W. Rozycki (macro@ds2.pg.gda.pl)
Date: Fri Apr 14 2000 - 11:37:38 EST


On Fri, 14 Apr 2000, Thomas S. Iversen wrote:

> > This is cheating -- a 5th family processor ought to support wp. Some
>
> It's cheating in one sense not in others. The information you see is what
> calling CPUID is yielding. I *know* that the processor has a broken WP,
> but it also clearly says so :)

 If you compile for an 486 or better the kernel assumes WP works right --
no check is performed other than the following one (this is taken from
include/asm-i386/bugs.h):

if (boot_cpu_data.x86 == 3)
        panic("Kernel requires i486+ for 'invlpg' and other features");

You may actually check for "boot_cpu_data.x86_vendor == X86_VENDOR_NEXGEN"
here; hopefully the remaining code does not depend on the family directly.

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +

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