rearrange initialization.  take more care to leave kbd alone if bios says there is none.

Reference: /n/atom/patch/applied/kbdinit
Date: Tue Mar 11 02:05:23 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/kbd.c	Tue Mar 11 02:03:56 2014
+++ /sys/src/nix/k10/kbd.c	Tue Mar 11 02:03:57 2014
@@ -590,6 +590,15 @@
 }
 
 void
+failkbd(void)
+{
+	sys->noi8042kbd = 1;
+	iofree(Data);
+	iofree(Cmd);
+	print(initfailed);
+}
+
+void
 kbdinit(void)
 {
 	int c, try;
@@ -597,6 +606,9 @@
 	if(sys->noi8042kbd)
 		return;
 
+	ioalloc(Data, 1, 0, "kbd data");
+	ioalloc(Cmd, 1, 0, "kbd cmd");
+
 	/* wait for a quiescent controller */
 	try = 1000;
 	while(try-- > 0 && (c = inb(Status)) & (Outbusy | Inready)) {
@@ -605,8 +617,7 @@
 		delay(1);
 	}
 	if (try <= 0) {
-		print(initfailed);
-		sys->noi8042kbd = 1;
+		failkbd();
 		return;
 	}
 
@@ -622,8 +633,7 @@
 	ccc &= ~Ckbddis;
 	ccc |= Csf | Ckbdint | Cscs1;
 	if(outready() < 0) {
-		print(initfailed);
-		sys->noi8042kbd = 1;
+		failkbd();
 		return;
 	}
 
@@ -645,13 +655,12 @@
 	qnoblock(kbdq, 1);
 	addkbdq(kbdq, -1);
 
-	ioalloc(Data, 1, 0, "kbd");
-	ioalloc(Cmd, 1, 0, "kbd");
-
-	intrenable(IrqKBD, i8042intr, 0, BUSUNKNOWN, "kbd");
+	if(!sys->noi8042kbd){
+		intrenable(IrqKBD, i8042intr, 0, BUSUNKNOWN, "kbd");
 
-	kbscans[Int].num = 0;
-	setleds(kbscans + Int);
+		kbscans[Int].num = 0;
+		setleds(kbscans + Int);
+	}
 }
 
 void