Module Name: src
Committed By: reinoud
Date: Tue Aug 30 11:31:57 UTC 2011
Modified Files:
src/sys/arch/usermode/usermode: pmap.c
Log Message:
Implement pmap_page_protect()
To generate a diff of this commit:
cvs rdiff -u -r1.43 -r1.44 src/sys/arch/usermode/usermode/pmap.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/usermode/usermode/pmap.c
diff -u src/sys/arch/usermode/usermode/pmap.c:1.43 src/sys/arch/usermode/usermode/pmap.c:1.44
--- src/sys/arch/usermode/usermode/pmap.c:1.43 Tue Aug 30 10:58:41 2011
+++ src/sys/arch/usermode/usermode/pmap.c Tue Aug 30 11:31:57 2011
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.43 2011/08/30 10:58:41 reinoud Exp $ */
+/* $NetBSD: pmap.c,v 1.44 2011/08/30 11:31:57 reinoud Exp $ */
/*-
* Copyright (c) 2011 Reinoud Zandijk <rein...@netbsd.org>
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.43 2011/08/30 10:58:41 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.44 2011/08/30 11:31:57 reinoud Exp $");
#include "opt_memsize.h"
#include "opt_kmempages.h"
@@ -825,10 +825,56 @@
aprint_debug("pmap_copy_page not implemented\n");
}
+/* change access permissions on a given physical page */
void
-pmap_page_protect(struct vm_page *pg, vm_prot_t prot)
+pmap_page_protect(struct vm_page *page, vm_prot_t prot)
{
-aprint_debug("pmap_page_protect not implemented\n");
+ intptr_t ppn;
+ struct pv_entry *pv, *npv;
+
+ ppn = atop(VM_PAGE_TO_PHYS(page));
+ aprint_debug("pmap_page_protect page %"PRIiPTR" to prot %d\n", ppn, prot);
+
+ if (prot == VM_PROT_NONE) {
+ /* visit all mappings */
+ npv = pv = &pv_table[ppn];
+ while (pv != NULL && pv->pv_pmap != NULL) {
+ /* skip unmanaged entries */
+ if (pv->pv_vflags & PV_UNMANAGED) {
+ pv = pv->pv_next;
+ continue;
+ }
+
+ /* if in an active pmap deactivate */
+ if (pv->pv_pmap->pm_flags & PM_ACTIVE)
+ pmap_page_deactivate(pv);
+
+ /* if not on the head, remember our next */
+ if (pv != &pv_table[ppn])
+ npv = pv->pv_next;
+
+ /* remove from pmap */
+ pv->pv_pmap->pm_entries[pv->pv_lpn] = NULL;
+ if (pv->pv_vflags & PV_WIRED)
+ pv->pv_pmap->pm_stats.wired_count--;
+ pv_release(pv->pv_pmap, ppn, pv->pv_lpn);
+
+ pv = npv;
+ }
+ } else if (prot != VM_PROT_ALL) {
+ /* visit all mappings */
+ for (pv = &pv_table[ppn]; pv != NULL; pv = pv->pv_next) {
+ /* if managed and in a pmap restrict access */
+ if ((pv->pv_pmap != NULL) &&
+ ((pv->pv_vflags & PV_UNMANAGED) == 0)) {
+ pv->pv_prot &= prot;
+ pv_update(pv);
+ /* if in active pmap (re)activate page */
+ if (pv->pv_pmap->pm_flags & PM_ACTIVE)
+ pmap_page_activate(pv);
+ }
+ }
+ }
}
bool
