use monmwait while waiting for thunderbirdsarego

Reference: /n/atom/patch/applied2013/thundermwait
Date: Fri Sep 20 01:39:07 CES 2013
Signed-off-by: quanstro@quanstr.net

--- /sys/src/nix/port/portfns.h	Fri Sep 20 01:38:40 2013
+++ /sys/src/nix/port/portfns.h	Fri Sep 20 01:38:42 2013
@@ -190,7 +190,6 @@
 ulong		ms2tk(ulong);
 void		mul64fract(uvlong*, uvlong, uvlong);
 void		muxclose(Mnt*);
-void		(*mwait)(void *);
 Chan*		namec(char*, int, int, int);
 void		nameerror(char*, char*);
 Chan*		newchan(void);
--- /sys/src/nix/k10/main.c	Fri Sep 20 01:38:44 2013
+++ /sys/src/nix/k10/main.c	Fri Sep 20 01:38:45 2013
@@ -45,7 +45,7 @@
 	 */
 	DBG("Wait for the thunderbirds!\n");
 	while(!active.thunderbirdsarego)
-		;
+		monmwait(&active.thunderbirdsarego, 0);
 	wrmsr(0x10, sys->epoch);
 	m->rdtsc = rdtsc();
 
@@ -421,7 +421,7 @@
 	for(i = 0; i < active.nonline; i++)
 		kproc("apshut", apshut, (void*)i);
 	while(active.nonline>1)
-		;
+		pause();
 
 	/* turn off buffered serial console? */