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.
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