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: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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