Re: APIC version and 8-bit APIC IDs
From: Martin Wilck
Date: Mon Aug 29 2005 - 02:26:30 EST
Maciej W. Rozycki wrote:
You are unfortunately mistaken -- the spec is explicit about *local* APIC
IDs having to start at 0. There are at least two places in the spec that
refer to that.
I see. Thanks for the clarification.
You can always assign 0, 16, 17, etc. to local APICs and then 1, 2, 3,
etc. for I/O APICs.
Actually, that's what we did (I messed thinks up in my posting). I think
that's an ugly configuration, though, and totally misleading in terms of
system topology.
Frankly I don't know what the actual justification
behind the requirement is. Note that the ID of 0 need not necessarily
belong to the BSP.
Starting both local APICs and IO-APICs at 0 isa working and
aesthetically pleasing solution. We're pursuing that now.
Thanks again, Martin
--
Martin Wilck Phone: +49 5251 8 15113
Fujitsu Siemens Computers Fax: +49 5251 8 20409
Heinz-Nixdorf-Ring 1 mailto:Martin.Wilck@xxxxxxxxxxxxxxxxxxx
D-33106 Paderborn http://www.fujitsu-siemens.com/primergy
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