Messages in this thread | | | Date | Thu, 27 Nov 2008 11:56:35 +0100 | From | Andi Kleen <> | Subject | Re: [Lguest] [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes |
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On Thu, Nov 27, 2008 at 12:13:43PM +0200, Avi Kivity wrote: > H. Peter Anvin wrote: > > > >>I suspect we could get it down to three bytes, by sharing the last > >>byte of the four-byte call sequence with the first byte of the next: > >> > >> 66 e8 ff 66 e8 fc 66 e8 f9 66 e8 f6 ... > >> > >>Every three bytes a new stub begins; it's a four-byte call to offset > >>0x6703 relative to the beginning of the first stub. > >> > >>Can anyone better 24 bits/stub? > > > >On the entirely silly level... > > > >CC xx > > Nice. Can actually go to zero, by pointing the IDT at (unmapped_area + > vector), and deducing the vector in the page fault handler from cr2.
That would be still one byte, otherwise you wouldn't get a unique index.
-Andi
-- ak@linux.intel.com
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