Route IOAPIC interrupts via ISA bus
Instead of calling the IOAPIC from the PIC, raise IOAPIC irqs via the ISA bus. As a side effect, IOAPIC lines 16-23 are enabled. Signed-off-by: NAvi Kivity <avi@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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