Messages in this thread | | | Date | Thu, 25 Aug 2011 18:41:57 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 1/2] x86, ioapic: Reserve only 128 bytes for IOAPICs |
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On 08/25/2011 05:17 PM, Bjorn Helgaas wrote: > > If the OS allocated the next 128 bytes to another device, it sounds > like it would cause a conflict on Intel boxes. This must be an area > that differs between vendors. I haven't seen a spec that mentions 256 > bytes as the required minimum MMIO size for IOAPICs, and apparently > the AMD IOAPIC decodes 240 bytes or fewer. >
For what it's worth, it's probably a bad idea on x86 for the OS to allocate addresses in the 0xFExxxxxx range...
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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