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authorJeremy Fitzhardinge <jeremy@goop.org>2009-02-06 14:09:40 -0800
committerIngo Molnar <mingo@elte.hu>2009-02-09 12:15:57 +0100
commit9b2b76a3344146c4d8d300874e73af8161204f87 (patch)
tree13c22f62ac7610f07b93fe9f4a75e0f57ebb450d /arch/x86/kernel/irq_64.c
parentcc6c50066ec1ac98bef97117e2f078bb89bbccc7 (diff)
downloadblackbird-op-linux-9b2b76a3344146c4d8d300874e73af8161204f87.tar.gz
blackbird-op-linux-9b2b76a3344146c4d8d300874e73af8161204f87.zip
x86: add handle_irq() to allow interrupt injection
Xen uses a different interrupt path, so introduce handle_irq() to allow interrupts to be inserted into the normal interrupt path. This is handled slightly differently on 32 and 64-bit. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/irq_64.c')
-rw-r--r--arch/x86/kernel/irq_64.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 018963aa6ee3..a93f3b0dc7f2 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -48,6 +48,20 @@ static inline void stack_overflow_check(struct pt_regs *regs)
#endif
}
+bool handle_irq(unsigned irq, struct pt_regs *regs)
+{
+ struct irq_desc *desc;
+
+ stack_overflow_check(regs);
+
+ desc = irq_to_desc(irq);
+ if (unlikely(!desc))
+ return false;
+
+ generic_handle_irq_desc(irq, desc);
+ return true;
+}
+
/*
* do_IRQ handles all normal device IRQ's (the special
* SMP cross-CPU interrupts have their own specific
@@ -56,7 +70,6 @@ static inline void stack_overflow_check(struct pt_regs *regs)
asmlinkage unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
- struct irq_desc *desc;
/* high bit used in ret_from_ code */
unsigned vector = ~regs->orig_ax;
@@ -64,14 +77,10 @@ asmlinkage unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
exit_idle();
irq_enter();
- irq = __get_cpu_var(vector_irq)[vector];
- stack_overflow_check(regs);
+ irq = __get_cpu_var(vector_irq)[vector];
- desc = irq_to_desc(irq);
- if (likely(desc))
- generic_handle_irq_desc(irq, desc);
- else {
+ if (!handle_irq(irq, regs)) {
if (!disable_apic)
ack_APIC_irq();
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