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SubjectRe: APIC version and 8-bit APIC IDs
Hi Maciej,

> It actually depends on the APIC type, rather than the CPU. E.g. with
> Pentium systems the width of the ID is either 4 bits or 8 bits,
> depending on whether the integrated or an external 82489DX APIC is
> used. This should be able to be determined by the APIC version; for
> v <= 0xf the ID is 8-bit and for v >= 0x10 it used to be 4-bit. Now
> you only need to determine what is the value of v above 0x10 that
> makes the ID 8-bit again.

That would be v>=0x14 for Intel. But that is wrong for AMD CPUs. The
actual Dual-Core Athlon CPUs we have report an APIC version of 0x10.
Please refer to the start of this thread.

Anyway, I understand that you agree this does not belong into the
subarch code?


Martin Wilck Phone: +49 5251 8 15113
Fujitsu Siemens Computers Fax: +49 5251 8 20409
Heinz-Nixdorf-Ring 1
D-33106 Paderborn
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