Re: APIC version and 8-bit APIC IDs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]
  Powered by Linux