[src/trunk]: src/sys/arch/usermode/usermode Implement pmap_destroy() followin...

[reinoud <reinoud%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f6d1ba597c5d
branches:  trunk
changeset: 769023:f6d1ba597c5d
user:      reinoud <reinoud%NetBSD.org@localhost>
date:      Tue Aug 30 10:44:06 2011 +0000

description:
Implement pmap_destroy() following Ben Harris's template

diffstat:

 sys/arch/usermode/usermode/pmap.c |  23 ++++++++++++++++++++---
 1 files changed, 20 insertions(+), 3 deletions(-)

diffs (44 lines):

diff -r 78e4a1caacdb -r f6d1ba597c5d sys/arch/usermode/usermode/pmap.c
--- a/sys/arch/usermode/usermode/pmap.c Tue Aug 30 10:37:42 2011 +0000
+++ b/sys/arch/usermode/usermode/pmap.c Tue Aug 30 10:44:06 2011 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.41 2011/08/30 10:37:42 reinoud Exp $ */
+/* $NetBSD: pmap.c,v 1.42 2011/08/30 10:44:06 reinoud Exp $ */
 
 /*-
  * Copyright (c) 2011 Reinoud Zandijk <reinoud%NetBSD.org@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.41 2011/08/30 10:37:42 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.42 2011/08/30 10:44:06 reinoud Exp $");
 
 #include "opt_memsize.h"
 #include "opt_kmempages.h"
@@ -356,7 +356,24 @@
 void
 pmap_destroy(pmap_t pmap)
 {
-aprint_debug("pmap_destroy not implemented!\n");
+       int i;
+
+       /* if multiple references exist just remove a reference */
+       aprint_debug("pmap_destroy %p\n", pmap);
+       if (--pmap->pm_count > 0)
+               return;
+
+       /* safe guard against silly errors */
+       KASSERT((pmap->pm_flags & PM_ACTIVE) == 0);
+       KASSERT(pmap->pm_stats.resident_count == 0);
+       KASSERT(pmap->pm_stats.wired_count == 0);
+#ifdef DIAGNOSTIC
+       for (i = 0; i < pm_nentries; i++)
+               if (pmap->pm_entries[i] != NULL)
+                       panic("pmap_destroy: pmap isn't empty");
+#endif
+       free((void *)pmap->pm_entries, M_VMPMAP);
+       pool_put(&pmap_pool, pmap);
 }
 
 void