D55889.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
	@@ -84,6 +84,7 @@
	* to use that ID.
	*/
	#define IOAPIC_MAX_ID 0xff
	+#define IOAPIC_MAX_EXT_ID 0x7fff

	/* I/O Interrupts are used for external devices such as ISA, PCI, etc. */
	#define APIC_IO_INTS (IDT_IO_INTS + 16)
	diff --git a/sys/x86/x86/io_apic.c b/sys/x86/x86/io_apic.c
	--- a/sys/x86/x86/io_apic.c
	+++ b/sys/x86/x86/io_apic.c
	@@ -371,6 +371,13 @@
	low = IOART_DESTPHY;
	high = intpin->io_cpu << APIC_ID_SHIFT;
	intpin->io_valid = 1;
	+ } else if (intpin->io_cpu <= IOAPIC_MAX_EXT_ID &&
	+ apic_ext_dest_id == 1) {
	+ low = IOART_DESTPHY;
	+ high = intpin->io_cpu << APIC_ID_SHIFT & APIC_ID_MASK;
	+ high \|= (intpin->io_cpu >> 8) << APIC_EXT_ID_SHIFT
	+ & APIC_EXT_ID_MASK;
	+ intpin->io_valid = 1;
	} else {
	printf("%s: unsupported destination APIC ID %u for pin %u\n",
	__func__, intpin->io_cpu, intpin->io_intpin);