Make context switching much more MI:

 - Move the functionality of choosing a process from cpu_switch into
   a much simpler function: cpu_switchto. Instead of having the locore
   code walk the run queues, let the MI code choose the process we
   want to run and only implement the context switching itself in MD
   code.
 - Let MD context switching run without worrying about spls or locks.
 - Instead of having the idle loop implemented with special contexts
   in MD code, implement one idle proc for each cpu. make the idle
   loop MI with MD hooks.
 - Change the proc lists from the old style vax queues to TAILQs.
 - Change the sleep queue from vax queues to TAILQs. This makes
   wakeup() go from O(n^2) to O(n)

there will be some MD fallout, but it will be fixed shortly.
There's also a few cleanups to be done after this.

deraadt@, kettenis@ ok

3 files changed, 5 insertions, 8 deletions

diff --git a/sys/arch/powerpc/conf/files.powerpc b/sys/arch/powerpc/conf/files.powerpc
index 9bfb6960e27..d3effdc83a4 100644
--- a/sys/arch/powerpc/conf/files.powerpc
+++ b/sys/arch/powerpc/conf/files.powerpc
@@ -1,8 +1,7 @@
-#	$OpenBSD: files.powerpc,v 1.42 2007/03/22 19:26:27 kettenis Exp $
+#	$OpenBSD: files.powerpc,v 1.43 2007/10/10 15:53:52 art Exp $
 #
 
 file	arch/powerpc/powerpc/setjmp.S			ddb
-file	arch/powerpc/powerpc/Locore.c
 file	arch/powerpc/powerpc/bcopy.c
 file	arch/powerpc/powerpc/copystr.c
 file	arch/powerpc/powerpc/cpu_subr.c
diff --git a/sys/arch/powerpc/include/pcb.h b/sys/arch/powerpc/include/pcb.h
index a49d03f1488..7560dee7b17 100644
--- a/sys/arch/powerpc/include/pcb.h
+++ b/sys/arch/powerpc/include/pcb.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pcb.h,v 1.10 2007/03/20 20:59:53 kettenis Exp $	*/
+/*	$OpenBSD: pcb.h,v 1.11 2007/10/10 15:53:52 art Exp $	*/
 /*	$NetBSD: pcb.h,v 1.1 1996/09/30 16:34:29 ws Exp $	*/
 
 /*-
@@ -49,7 +49,6 @@ struct pcb {
 	struct pmap *pcb_pm;	/* pmap of our vmspace */
 	struct pmap *pcb_pmreal; /* real address of above */
 	register_t pcb_sp;	/* saved SP */
-	int pcb_spl;		/* saved SPL */
 	faultbuf *pcb_onfault;	/* For use during copyin/copyout */
 	int pcb_flags;
 #define	PCB_FPU		1	/* Process had FPU initialized */
diff --git a/sys/arch/powerpc/powerpc/vm_machdep.c b/sys/arch/powerpc/powerpc/vm_machdep.c
index 5a7d92622de..89755b7c774 100644
--- a/sys/arch/powerpc/powerpc/vm_machdep.c
+++ b/sys/arch/powerpc/powerpc/vm_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vm_machdep.c,v 1.44 2007/06/20 17:29:36 miod Exp $	*/
+/*	$OpenBSD: vm_machdep.c,v 1.45 2007/10/10 15:53:52 art Exp $	*/
 /*	$NetBSD: vm_machdep.c,v 1.1 1996/09/30 16:34:57 ws Exp $	*/
 
 /*
@@ -123,7 +123,6 @@ cpu_fork(struct proc *p1, struct proc *p2, void *stack, size_t stacksize,
 	sf->sp = (int)cf;
 	sf->user_sr = pmap_kernel()->pm_sr[PPC_USER_SR]; /* just in case */
 	pcb->pcb_sp = (int)stktop2;
-	pcb->pcb_spl = 0;
 }
 
 /*
@@ -155,8 +154,8 @@ cpu_exit(struct proc *p)
 		pool_put(&ppc_vecpl, pcb->pcb_vr);
 #endif /* ALTIVEC */
 	
-	(void)splsched();
-	switchexit(p);
+	pmap_deactivate(p);
+	sched_exit(p);
 }
 
 /*