diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2006-06-27 02:53:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-27 17:32:37 -0700 |
| commit | 19eadf98c8167eac843580683317b99572e2abf0 (patch) | |
| tree | a5625f7834f0f06fc28a605c3cdb8debe2218498 /arch/x86_64/kernel/irq.c | |
| parent | bd9e0b74f52dbac6241643fadca2393808b14c7a (diff) | |
[PATCH] x86: increase interrupt vector range
Remove the limit of 256 interrupt vectors by changing the value stored in
orig_{e,r}ax to be the complemented 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>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/irq.c')
| -rw-r--r-- | arch/x86_64/kernel/irq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c index 59518d4d4358..3be0a7e4bf08 100644 --- a/arch/x86_64/kernel/irq.c +++ b/arch/x86_64/kernel/irq.c @@ -115,8 +115,8 @@ skip: */ asmlinkage unsigned int do_IRQ(struct pt_regs *regs) { - /* high bits used in ret_from_ code */ - unsigned irq = regs->orig_rax & 0xff; + /* high bit used in ret_from_ code */ + unsigned irq = ~regs->orig_rax; exit_idle(); irq_enter(); |