implement pmap_{,de}activate

2 files changed, 44 insertions, 2 deletions

diff --git a/sys/arch/sparc/include/pmap.h b/sys/arch/sparc/include/pmap.h
index a96e5fc48f6..550d6e9aa1a 100644
--- a/sys/arch/sparc/include/pmap.h
+++ b/sys/arch/sparc/include/pmap.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.h,v 1.7 1997/11/07 08:11:41 deraadt Exp $	*/
+/*	$OpenBSD: pmap.h,v 1.8 1999/04/22 17:07:29 art Exp $	*/
 /*	$NetBSD: pmap.h,v 1.30 1997/08/04 20:00:47 pk Exp $ */
 
 /*
@@ -246,6 +246,9 @@ int             pmap_dumpmmu __P((int (*)__P((dev_t, daddr_t, caddr_t, size_t)),
 
 /* FUNCTION DECLARATIONS FOR COMMON PMAP MODULE */
 
+struct proc;
+void		pmap_activate __P((struct proc *));
+void		pmap_deactivate __P((struct proc *));
 void		pmap_bootstrap __P((int nmmu, int nctx, int nregion));
 int		pmap_count_ptes __P((struct pmap *));
 void		pmap_prefer __P((vm_offset_t, vm_offset_t *));
diff --git a/sys/arch/sparc/sparc/pmap.c b/sys/arch/sparc/sparc/pmap.c
index 8ccd5f9dea9..950e498ea3a 100644
--- a/sys/arch/sparc/sparc/pmap.c
+++ b/sys/arch/sparc/sparc/pmap.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.c,v 1.23 1999/01/11 05:11:59 millert Exp $	*/
+/*	$OpenBSD: pmap.c,v 1.24 1999/04/22 17:07:30 art Exp $	*/
 /*	$NetBSD: pmap.c,v 1.118 1998/05/19 19:00:18 thorpej Exp $ */
 
 /*
@@ -6399,6 +6399,45 @@ pmap_redzone()
 #endif
 }
 
+/*
+ * Activate the address space for the specified process.  If the
+ * process is the current process, load the new MMU context.
+ */
+void
+pmap_activate(p)
+	struct proc *p;
+{
+	pmap_t pmap = p->p_vmspace->vm_map.pmap;
+	int s;
+
+	/*
+	 * This is essentially the same thing that happens in cpu_switch()
+	 * when the newly selected process is about to run, except that we
+	 * have to make sure to clean the register windows before we set
+	 * the new context.
+	 */
+
+	s = splpmap();
+	if (p == curproc) {
+		write_user_windows();
+		if (pmap->pm_ctx == NULL) {
+			ctx_alloc(pmap);	/* performs setcontext() */
+		} else {
+			setcontext(pmap->pm_ctxnum);
+		}
+	}
+	splx(s);
+}
+
+/*
+ * Deactivate the address space of the specified process.
+ */
+void
+pmap_deactivate(p)
+	struct proc *p;
+{
+}
+
 #ifdef DEBUG
 /*
  * Check consistency of a pmap (time consuming!).