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    SubjectRe: [PATCH] Pentium Pro - sysenter - doublefault
    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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