reorganize port/clock.c to properly deal with >1 mach

Reference: /n/atom/patch/applied2013/fsmpclock
Date: Mon Aug 26 05:26:39 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/port/clock.c	Mon Aug 26 05:25:40 2013
+++ /sys/src/fs/port/clock.c	Mon Aug 26 05:25:41 2013
@@ -92,11 +92,11 @@
 void
 clock(Timet n, uintptr pc)
 {
-	int i;
 	User *p;
 
 	clockreload(n);
-	m->ticks++;
+	if(m->machno == 0)
+		m->ticks++;		/* wrong */
 
 	if(cons.profile) {
 		cons.profbuf[0] += TK2MS(1);
@@ -108,27 +108,22 @@
 			cons.profbuf[1] += TK2MS(1);
 	}
 
-	lights(Lreal, (m->ticks>>6)&1);
+	p = m->proc;
+	if(p == nil)
+		p = m->intrp;
+	if(p)
+		p->time.count += 10*TK2MS(1);
+	else
+		m->idle.count += 10*TK2MS(1);
+	m->intrp = 0;
+
 	if(m->machno == 0){
 		if(f.cons >= 0) {
 			(*consputc)(f.cons);
 			f.cons = -1;
 		}
-		p = m->proc;
-		if(p == 0)
-			p = m->intrp;
-		if(p)
-			p->time.count += 10*TK2MS(1);
-		else
-			m->idle.count += 10*TK2MS(1);
-		for(i=1; i<conf.nmach; i++){
-			if(active.machs & (1<<i)){
-				p = MACHP(i)->proc;
-				if(p && p != m->intrp)
-					p->time.count += 10*TK2MS(1);
-			}
-		}
-		m->intrp = 0;
+
+		lights(Lreal, (m->ticks>>6)&1);
 
 		f.time += TK2MS(1);
 		while(f.time >= 1000) {
@@ -138,7 +133,7 @@
 	}
 
 	if(active.exiting && active.machs&(1<<m->machno)){
-		print("someone's exiting\n");
+		print("cpu%d: someone's exiting\n", m->machno);
 		exit();
 	}