Messages in this thread | | | Date | Mon, 15 May 2006 14:57:20 -0700 | From | Chris Wright <> | Subject | Re: [RFC PATCH 23/35] Increase x86 interrupt vector range |
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* Chuck Ebbert (76306.1226@compuserve.com) wrote: > In-Reply-To: <20060509085157.070289000@sous-sol.org> > > On Tue, 09 May 2006 00:00:23 -0700, Chris Wright wrote: > > > Remove the limit of 256 interrupt vectors by changing the value > > stored in orig_{e,r}ax to be the negated interrupt vector. > > The orig_{e,r}ax needs to be < 0 to allow the signal code to > > distinguish between return from interrupt and return from syscall. > > With this change applied, NR_IRQS can be > 256. > > > > Xen extends the IRQ numbering space to include room for dynamically > > allocated virtual interrupts (in the range 256-511), which requires a > > more permissive interface to do_IRQ. > > > > Signed-off-by: Ian Pratt <ian.pratt@xensource.com> > > Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk> > > Signed-off-by: Chris Wright <chrisw@sous-sol.org> > > --- > > AFAIC this could go in anytime. It's simple, self-contained and makes > sense even without Xen.
The plan is to split out things like this and push them ahead of the rest of the batch.
> One minor nit: the IRQ value isn't negated, it's complemented. The > comments need to be fixed.
OK, bitwise negated.
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