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?
Regards Martin -- Martin Wilck Phone: +49 5251 8 15113 Fujitsu Siemens Computers Fax: +49 5251 8 20409 Heinz-Nixdorf-Ring 1 mailto:[EMAIL PROTECTED] D-33106 Paderborn http://www.fujitsu-siemens.com/primergy - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
