Messages in this thread | | | Date | Mon, 25 Aug 2003 07:09:00 +0100 | From | Jamie Lokier <> | Subject | Re: [PATCH] Pentium Pro - sysenter - doublefault |
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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.
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