--- /sys/src/9k/k10/fns.h
+++ /sys/src/9k/k10/fns.h
@@ -218,6 +218,11 @@ extern int i8259isr(int);
 extern void mpsinit(void);
 
 /*
+ * mpacpi.c
+ */
+extern void mpacpi(void);
+
+/*
  * sipi.c
  */
 extern void sipi(void);
--- /sys/src/9k/k10/k10aoe
+++ /sys/src/9k/k10/k10aoe
@@ -55,7 +55,7 @@ link +dev
 
 misc +dev
 	nocache
-	mp		apic ioapic pci sipi
+	mp		apic ioapic pci sipi mpacpi
 
 #
 #boot cpu
--- /sys/src/9k/k10/k10cpu
+++ /sys/src/9k/k10/k10cpu
@@ -49,7 +49,7 @@ link +dev
 
 misc +dev
 	cache
-	mp		apic ioapic pci sipi
+	mp		apic ioapic pci sipi mpacpi
 
 #
 #boot cpu
--- /sys/src/9k/k10/k10cpuf
+++ /sys/src/9k/k10/k10cpuf
@@ -56,7 +56,7 @@ link +dev
 
 misc +dev
 	cache
-	mp		apic ioapic pci sipi
+	mp		apic ioapic pci sipi mpacpi
 
 #
 #boot cpu
--- /sys/src/9k/k10/k10root
+++ /sys/src/9k/k10/k10root
@@ -48,7 +48,7 @@ link +dev
 
 misc +dev
 	nocache
-	mp		apic ioapic pci sipi
+	mp		apic ioapic pci sipi mpacpi
 
 #
 #boot cpu
--- /sys/src/9k/k10/mp.c
+++ /sys/src/9k/k10/mp.c
@@ -479,6 +479,7 @@ mpsinit(void)
 	 * startup.
 	 */
 	mpparse(pcmp);
+	mpacpi();
 
 	apicdump();
 	ioapicdump();
--- /dev/null
+++ /sys/src/9k/k10/mpacpi.c
@@ -0,0 +1,57 @@
+#include "u.h"
+#include "../port/lib.h"
+#include "mem.h"
+#include "dat.h"
+#include "fns.h"
+
+#include "io.h"
+#include "mp.h"
+#include "apic.h"
+#include "acpi.h"
+
+extern	Madt*	apics;
+
+void
+mpacpi(void)
+{
+	char *already;
+	int nprocid, bp;
+	Apic *apic;
+	Apicst *st;
+
+	DBG("APIC mpacpi lapic addr %#p, flags %#ux\n",
+		apics->lapicpa, apics->pcat);
+
+	nprocid = 0;
+	for(st = apics->st; st != nil; st = st->next){
+		already = "";
+		switch(st->type){
+		case ASlapic:
+			if(st->lapic.id > Napic)
+				break;
+			apic = &xapic[st->lapic.id];
+			bp = (nprocid++ == 0);
+			if(apic->useable)
+				already = "(on)";
+			else
+				apicinit(st->lapic.id, apics->lapicpa, bp);
+			USED(already);
+			DBG("apic proc %d/%d apicid %d %s\n", nprocid-1,
+				apic->machno, st->lapic.id, already);
+			break;
+		case ASioapic:
+			if(st->ioapic.id > Napic)
+				break;
+			apic = &ioapic[st->ioapic.id];
+			if(apic->useable){
+				apic->gsib = st->ioapic.ibase;
+				already = "(on)";
+			}else
+				ioapicinit(st->ioapic.id, st->ioapic.addr);
+			USED(already);
+			DBG("ioapic %d addr %p gsib %d %s\n",
+				st->ioapic.id, apic->addr, apic->gsib, already);
+			break;
+		}
+	}
+}