kernel: cleanup exit()/shutdown()/reboot() code

introduce cpushutdown() function that does the common
operation of initiating shutdown, returning once all
cpu's got the message and are about to shutdown. this
avoids duplicated code which isnt really machine specific.

automatic reboot on panic only when *debug= is not set
and the machine is a cpu server or has no display,
otherwise just hang.

2 files changed, 3 insertions, 43 deletions

diff --git a/sys/src/9/bcm/dat.h b/sys/src/9/bcm/dat.h
index cb860a6fa..76d4012c3 100644
--- a/sys/src/9/bcm/dat.h
+++ b/sys/src/9/bcm/dat.h
@@ -225,7 +225,6 @@ struct
 	Lock;
 	int	machs;			/* bitmap of active CPUs */
 	int	exiting;		/* shutdown */
-	int	ispanic;		/* shutdown in response to a panic */
 }active;
 
 extern register Mach* m;			/* R10 */
diff --git a/sys/src/9/bcm/main.c b/sys/src/9/bcm/main.c
index 1746a5279..a39637a21 100644
--- a/sys/src/9/bcm/main.c
+++ b/sys/src/9/bcm/main.c
@@ -522,39 +522,13 @@ confinit(void)
 
 }
 
-static void
-shutdown(int ispanic)
-{
-	int ms, once;
-
-	lock(&active);
-	if(ispanic)
-		active.ispanic = ispanic;
-	else if(m->machno == 0 && (active.machs & (1<<m->machno)) == 0)
-		active.ispanic = 0;
-	once = active.machs & (1<<m->machno);
-	active.machs &= ~(1<<m->machno);
-	active.exiting = 1;
-	unlock(&active);
-
-	if(once)
-		iprint("cpu%d: exiting\n", m->machno);
-	spllo();
-	for(ms = 5*1000; ms > 0; ms -= TK2MS(2)){
-		delay(TK2MS(2));
-		if(active.machs == 0 && consactive() == 0)
-			break;
-	}
-	delay(1000);
-}
-
 /*
  *  exit kernel either on a panic or user request
  */
 void
-exit(int code)
+exit(int)
 {
-	shutdown(code);
+	cpushutdown();
 	splfhi();
 	archreboot();
 }
@@ -579,17 +553,8 @@ reboot(void *entry, void *code, ulong size)
 {
 	void (*f)(ulong, ulong, ulong);
 
-	print("starting reboot...");
 	writeconf();
-	shutdown(0);
-
-	/*
-	 * should be the only processor running now
-	 */
-
-	print("reboot entry %#lux code %#lux size %ld\n",
-		PADDR(entry), PADDR(code), size);
-	delay(100);
+	cpushutdown();
 
 	/* turn off buffered serial console */
 	serialoq = nil;
@@ -612,10 +577,6 @@ reboot(void *entry, void *code, ulong size)
 
 	/* off we go - never to return */
 	(*f)(PADDR(entry), PADDR(code), size);
-
-	iprint("loaded kernel returned!\n");
-	delay(1000);
-	archreboot();
 }
 
 int