Send a ipi to wakeup the core in a role change.

Reference: /n/patches.lsub.org/patch/ipiroles
Date: Thu Jul  5 15:29:38 CES 2012
Signed-off-by: paurea@lsub.org

--- /sys/src/nix/k10/tcore.c	Tue Jul  3 10:40:23 2012
+++ /sys/src/nix/k10/tcore.c	Thu Jul  5 15:28:12 2012
@@ -218,8 +218,8 @@
 		mp->nixrole = NIXSC;
 		mp->qexpired = 1;
 		coherence();
-		/* when idlehands sleeps, this needs to send a wake it up IPI? */
-		//this breaks the core now... (ipi a TC?) apicipi(mp->apicno);
+		/* in case the core is sleeping */
+		apicipi(mp->apicno);
 		sleep(&mp->sipir, donequiesce, mp);
 
 	/* fall */
--- /sys/src/nix/k10/trap.c	Thu Jun 14 09:36:24 2012
+++ /sys/src/nix/k10/trap.c	Thu Jul  5 15:27:28 2012
@@ -17,8 +17,8 @@
 static void debugbpt(Ureg*, void*);
 static void faultamd64(Ureg*, void*);
 static void doublefault(Ureg*, void*);
+static void ipihdler(Ureg*, void*);
 static void unexpected(Ureg*, void*);
-static void expected(Ureg*, void*);
 static void dumpstackwithureg(Ureg*);
 
 static Lock vctllock;
@@ -202,7 +202,7 @@
 	trapenable(VectorBPT, debugbpt, 0, "#BP");
 	trapenable(VectorPF, faultamd64, 0, "#PF");
 	trapenable(Vector2F, doublefault, 0, "#DF");
-	intrenable(IdtIPI, expected, 0, BUSUNKNOWN, "#IPI");
+	intrenable(IdtIPI, ipihdler, 0, BUSUNKNOWN, "#IPI");
 	trapenable(Vector15, unexpected, 0, "#15");
 	nmienable();
 
@@ -595,8 +595,12 @@
 }
 
 static void
-expected(Ureg*, void*)
+ipihdler(Ureg*, void*)
 {
+	coherence();
+	if(isbooting(m) && m->proc == nil){
+			tcquiesce();
+	}
 }
 
 static void