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SubjectRe: [PATCH] Pentium Pro - sysenter - doublefault

> > I double-checked AP-485 (24161823.pdf, the "real" reference to CPUID),
> > and it says (section 3.4) that SEP is unsupported when the signature
> > as a whole is less that 0x633. This means all PPros, and PII Model 3s
> > with steppings less than 3.
> "SEP is unsupported". It's interesting that Pentium Pro erratum #82
> is "SYSENTER/SYSEXIT instructions can implicitly load 'null segment
> selector' to SS and CS registers", implying that SYSENTER does
> _something_ useful on PPros.

Well, with CS==0 machine is not going to survive too long.
If it only happens sometimes you might catch the double fault
and fixup, but....
Written on sharp zaurus, because my Velo1 broke. If you have Velo you don't need...

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