lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

x86: add handle_irq() to allow interrupt injection

Browse Source 
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>
This commit is contained in:
Jeremy Fitzhardinge
2009-02-06 14:09:40 -08:00
committed by Ingo Molnar
parent cc6c50066e
commit 9b2b76a334
3 changed files with 38 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
arch/x86/kernel/irq_64.c
View File

@ -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);
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();