From 19eadf98c8167eac843580683317b99572e2abf0 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Tue, 27 Jun 2006 02:53:44 -0700 Subject: [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 Signed-off-by: Christian Limpach Signed-off-by: Chris Wright Signed-off-by: Rusty Russell Cc: "Protasevich, Natalie" Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/entry.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/i386/kernel/entry.S') diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S index e6e4506e749..8713e0248a0 100644 --- a/arch/i386/kernel/entry.S +++ b/arch/i386/kernel/entry.S @@ -515,7 +515,7 @@ ENTRY(irq_entries_start) .if vector CFI_ADJUST_CFA_OFFSET -4 .endif -1: pushl $vector-256 +1: pushl $~(vector) CFI_ADJUST_CFA_OFFSET 4 jmp common_interrupt .data @@ -535,7 +535,7 @@ common_interrupt: #define BUILD_INTERRUPT(name, nr) \ ENTRY(name) \ RING0_INT_FRAME; \ - pushl $nr-256; \ + pushl $~(nr); \ CFI_ADJUST_CFA_OFFSET 4; \ SAVE_ALL; \ movl %esp,%eax; \ -- cgit v1.2.3-70-g09d2