add flag for disabling msi-x

Reference: /n/atom/patch/applied2013/msixflag
Date: Sun Dec 29 16:10:10 CET 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/dat.h	Sun Dec 29 16:10:05 2013
+++ /sys/src/nix/k10/dat.h	Sun Dec 29 16:10:06 2013
@@ -241,6 +241,7 @@
 			uchar	noi8042kbd;
 			uchar	novga;
 			uchar	nomsi;
+			uchar	nomsix;
 			uchar	nocmos;
 
 			uchar	monitor;
--- /sys/src/nix/k10/devarch.c	Sun Dec 29 16:10:07 2013
+++ /sys/src/nix/k10/devarch.c	Sun Dec 29 16:10:07 2013
@@ -389,6 +389,7 @@
 	p = seprint(p, e, "i8042kbd	%d\n", !sys->noi8042kbd);
 	p = seprint(p, e, "vga	%d\n", !sys->novga);
 	p = seprint(p, e, "msi	%d\n", !sys->nomsi);
+	p = seprint(p, e, "msi-x	%d\n", !sys->nomsix);
 	p = seprint(p, e, "cmos	%d\n", !sys->nocmos);
 
 	p = seprint(p, e, "monitor	%d\n", sys->monitor);
@@ -424,8 +425,7 @@
 	delay(1);
 	outb(0xcf9, i|0x06);				/* RST_CPU transition */
 
-	for(;;)
-		pause();
+	ndnr();
 }
 
 /*