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pc, pc64: implement acpi reset (for efi)

x230 booted in efi only (no csp) mode hangs
when traditional i8042reset() keyboard reset
is tried.

so we try acpireset() first which discoveres
and writes the acpi reset register.

--- a/sys/src/9/pc/archacpi.c

+++ b/sys/src/9/pc/archacpi.c

@@ -862,3 +862,29 @@

 {

 	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;

+	}

+}

--- 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]);

--- a/sys/src/9/pc/mp.c

+++ b/sys/src/9/pc/mp.c

@@ -585,6 +585,7 @@

 	lapicicrw(0, 0x000C0000|ApicINIT);

 	pcireset();

+	acpireset();

 	i8042reset();

 	/*

--- 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]);