Messages in this thread | | | Date | Tue, 16 Sep 2003 14:42:29 +0200 (MET DST) | From | "Maciej W. Rozycki" <> | Subject | Re: RFC: [2.6 patch] better i386 CPU selection |
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On Fri, 12 Sep 2003, Mikael Pettersson wrote:
> GOOD_APIC is Intel P5MMX, Intel P6 and above, and AMD K7 and above. > Nothing else has GOOD_APIC: P5 Classic because of the bug, and the > rest because they don't have local APIC at all.
Other systems may (and do) have an external APIC. This includes i486 and all Pentium systems. Note that the code doing a run-time check in <asm/bugs.h> does a check for X86_FEATURE_APIC in boot_cpu_data.x86_capability -- if the bit is reset then the local APIC is external (there's no on-chip local APIC or it's disabled) and the test does not panic() even if the stepping indicates the erratum is present.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
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