Re: [PATCH] Pentium Pro - sysenter - doublefault

[Jamie Lokier]

Mikael Pettersson wrote:
> 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.

-- Jamie
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