Messages in this thread | | | Date | Wed, 3 Sep 2003 14:50:20 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH] Pentium Pro - sysenter - doublefault |
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Hi!
> > 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.... Pavel -- Pavel Written on sharp zaurus, because my Velo1 broke. If you have Velo you don't need...
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