Re: Still not perfect AMD detection
Brian Gerst (bgerst@quark.vpplus.com)
Wed, 30 Dec 1998 10:48:19 -0500
Kurt Garloff wrote:
>
> On Wed, Dec 30, 1998 at 02:37:38AM +0000, Alan Cox wrote:
>
> > > vendor_id : AuthenticAMD
> > > cpu family : 5
> > > model : 6
> > > model name : AMD-K6tm w/ multimedia extensions
> > > stepping : 2
> > > cpu MHz : 200.459398
> > > flags : fpu vme de pse tsc msr mce cx8 10 mmx
> > >
> > > Note the number 10 in flags line. Other information is correct.
> > > 2.2.0-pre1+ac1+ide update, UP.
> >
> > Do you know what bit 10 is ?
>
> According to AMD docs (#20734, rev. i), the K6 (6.2) should return
> 0080_01BF on CPUID1 in EDX, which means
> fpu, vme, de, pse, tsc, msr, mce, cx8, mmx
>
> Later versions of the K6 (7.1) add "sep" and "3dnow" (8.0 = K6-2).
>
> Bit "10" is not documented in the above doc!
> It's correct for the kernel to report it like that then ...
Quoted from sandpile.org:
The K6 model 6 used bit 10 to indicate the SYSCALL/SYSRET
extensions. Starting with the K6 model 7, bit 11 is used to
indicate these extensions.
--
Brian Gerst
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