4 files changed, 29 insertions, 0 deletions
diff --git a/sys/src/9/pc/archacpi.c b/sys/src/9/pc/archacpi.c
index f996d90df..a9482fc83 100644
--- a/sys/src/9/pc/archacpi.c
+++ b/sys/src/9/pc/archacpi.c
@@ -862,3 +862,29 @@ amldelay(int us)
 {
 	microdelay(us);
 }
+
+/*
+ * reset machine by writing acpi reset register.
+ */
+void
+acpireset(void)
+{
+	uchar *p;
+	Tbl *t;
+	int i;
+
+	for(i=0; i < ntblmap; i++){
+		t = tblmap[i];
+		if(memcmp(t->sig, "FACP", 4) != 0)
+			continue;
+		if(get32(t->len) <= 128)
+			break;
+		p = (uchar*)t;
+		if((get32(p + 112) & (1<<10)) == 0)
+			break;
+		if(p[116+0] != IoSpace)
+			break;
+		outb(get32(p+116+4), p[128]);
+		break;
+	}
+}
diff --git a/sys/src/9/pc/fns.h b/sys/src/9/pc/fns.h
index 8ecaa0f7d..93178a000 100644
--- a/sys/src/9/pc/fns.h
+++ b/sys/src/9/pc/fns.h
@@ -1,6 +1,7 @@
 #include "../port/portfns.h"
 
 void	aamloop(int);
+void	acpireset(void);
 Dirtab*	addarchfile(char*, int, long(*)(Chan*,void*,long,vlong), long(*)(Chan*,void*,long,vlong));
 void	archinit(void);
 int	bios32call(BIOS32ci*, u16int[3]);
diff --git a/sys/src/9/pc/mp.c b/sys/src/9/pc/mp.c
index 765fa30b6..63fe687fa 100644
--- a/sys/src/9/pc/mp.c
+++ b/sys/src/9/pc/mp.c
@@ -585,6 +585,7 @@ mpshutdown(void)
 	lapicicrw(0, 0x000C0000|ApicINIT);
 
 	pcireset();
+	acpireset();
 	i8042reset();
 
 	/*
diff --git a/sys/src/9/pc64/fns.h b/sys/src/9/pc64/fns.h
index fe67edded..15eb1a0f5 100644
--- a/sys/src/9/pc64/fns.h
+++ b/sys/src/9/pc64/fns.h
@@ -1,6 +1,7 @@
 #include "../port/portfns.h"
 
 void	aamloop(int);
+void	acpireset(void);
 Dirtab*	addarchfile(char*, int, long(*)(Chan*,void*,long,vlong), long(*)(Chan*,void*,long,vlong));
 void	archinit(void);
 int	bios32call(BIOS32ci*, u16int[3]);