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xen: use our own eventchannel->irq path

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Rather than overloading vectors for event channels, take full
responsibility for mapping an event channel to irq directly.  With
this patch Xen has its own irq allocator.

When the kernel gets an event channel upcall, it maps the event
channel number to an irq and injects it into the normal interrupt
path.

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 14:09:43 -08:00
committed by Ingo Molnar
parent eca217b36e
commit 792dc4f6cd
3 changed files with 21 additions and 24 deletions
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6
arch/x86/include/asm/xen/events.h
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@@ -15,10 +15,4 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
return raw_irqs_disabled_flags(regs->flags);
}
static inline void xen_do_IRQ(int irq, struct pt_regs *regs)
{
regs->orig_ax = ~irq;
do_IRQ(regs);
}
#endif /* _ASM_X86_XEN_EVENTS_H */