Messages in this thread | | | Date | Fri, 26 Aug 2011 09:24:09 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 1/2] x86, ioapic: Reserve only 128 bytes for IOAPICs |
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On 08/26/2011 09:21 AM, Bjorn Helgaas wrote: > > Is there some spec that requires all IOAPICs to be 1K aligned? I > don't doubt that's the case; I'd just like to see something more > concrete than folklore. I'm pretty sure there's some (possibly > secret) "IOAPIC architecture spec," and a section reference to it > would be nice. Even before my patch, I don't think we actually > checked or enforced any *alignment* -- we only set the size. I don't > know if it's worth it unless we have a problem it would fix, and it's > conceivable that we'd start warning about a perfectly functional > IOAPIC that's 128-byte aligned. >
The PIIX3 IOAPIC decoder could only decode addresses on a 1K granularity, but I don't think that was architectural. I will try to ask.
-hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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