Re: RFC: [2.6 patch] better i386 CPU selection

Maciej W. Rozycki
2003-09-16T12:45:56Z

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 +