D45157.diff
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	diff --git a/sys/x86/include/apicvar.h b/sys/x86/include/apicvar.h
	--- a/sys/x86/include/apicvar.h
	+++ b/sys/x86/include/apicvar.h
	@@ -78,7 +78,12 @@
	#define MAX_APIC_ID 0x800
	#define APIC_ID_ALL 0xffffffff

	-#define IOAPIC_MAX_ID xAPIC_MAX_APIC_ID
	+/*
	+ * The 0xff ID is used for broadcast IPIs for local APICs when not using
	+ * x2APIC. IPIs are not sent to I/O APICs so it's acceptable for an I/O APIC
	+ * to use that ID.
	+ */
	+#define IOAPIC_MAX_ID 0xff

	/* I/O Interrupts are used for external devices such as ISA, PCI, etc. */
	#define APIC_IO_INTS (IDT_IO_INTS + 16)