remove the conf·monitor hack and replace with sys->monitor.
also use acpi novga to disable touching vga registers.

Reference: /n/atom/patch/applied2013/sysmonitor
Date: Sat Oct  5 19:36:27 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/devvga.c	Sat Oct  5 19:35:50 2013
+++ /sys/src/nix/k10/devvga.c	Sat Oct  5 19:35:51 2013
@@ -65,17 +65,17 @@
 	CMunblank,	"unblank",	1,
 };
 
-extern int conf·monitor;
-
 static void
 vgareset(void)
 {
+	if(sys->novga)
+		return;
 	/* reserve the 'standard' vga registers */
 	if(ioalloc(0x2b0, 0x2df-0x2b0+1, 0, "vga") < 0)
 		panic("vga ports already allocated");
 	if(ioalloc(0x3c0, 0x3da-0x3c0+1, 0, "vga") < 0)
 		panic("vga ports already allocated");
-	conf·monitor = 1;
+	sys->monitor = 1;
 }
 
 static Chan*
--- /sys/src/nix/port/devmouse.c	Sat Oct  5 19:35:52 2013
+++ /sys/src/nix/port/devmouse.c	Sat Oct  5 19:35:53 2013
@@ -104,12 +104,10 @@
 
 extern Memimage* gscreen;
 
-int conf·monitor = 1;
-
 static void
 mousereset(void)
 {
-	if(!conf·monitor)
+	if(sys->monitor)
 		return;
 
 	curs = arrow;
@@ -137,7 +135,7 @@
 static void
 mouseinit(void)
 {
-	if(!conf·monitor)
+	if(!sys->monitor)
 		return;
 
 	curs = arrow;
@@ -152,7 +150,7 @@
 static Chan*
 mouseattach(char *spec)
 {
-	if(!conf·monitor)
+	if(!sys->monitor)
 		error(Egreg);
 	return devattach('m', spec);
 }
@@ -209,7 +207,7 @@
 static void
 mousecreate(Chan*, char*, int, int)
 {
-	if(!conf·monitor)
+	if(!sys->monitor)
 		error(Egreg);
 	error(Eperm);
 }