Changeset c142860 in mainline

Timestamp:

2012-01-13T22:29:44Z (13 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c7f8fc5

Parents:

f7f47a7

Message:

Use temporary pages in the anonymous backend.

File:

• kernel/generic/src/mm/backend_anon.c (modified) (7 diffs)

kernel/generic/src/mm/backend_anon.c

@@ -44 +44 @@
 #include <mm/frame.h>
 #include <mm/slab.h>
+#include <mm/km.h>
 #include <synch/mutex.h>
 #include <adt/list.h>
@@ -155 +156 @@
 int anon_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access)
 {
+        uintptr_t upage = ALIGN_DOWN(addr, PAGE_SIZE);
+        uintptr_t kpage;
         uintptr_t frame;
 
@@ -175 +178 @@
                 mutex_lock(&area->sh_info->lock);
                 frame = (uintptr_t) btree_search(&area->sh_info->pagemap,
-                    ALIGN_DOWN(addr, PAGE_SIZE) - area->base, &leaf);
+                    upage - area->base, &leaf);
                 if (!frame) {
                         bool allocate = true;
@@ -185 +188 @@
                          */
                         for (i = 0; i < leaf->keys; i++) {
-                                if (leaf->key[i] ==
-                                    ALIGN_DOWN(addr, PAGE_SIZE) - area->base) {
+                                if (leaf->key[i] == upage - area->base) {
                                         allocate = false;
                                         break;
@@ -192 +194 @@
                         }
                         if (allocate) {
-                                frame = (uintptr_t) frame_alloc_noreserve(
-                                    ONE_FRAME, 0);
-                                memsetb((void *) PA2KA(frame), FRAME_SIZE, 0);
+                                kpage = km_temporary_page_get(&frame,
+                                    FRAME_NO_RESERVE);
+                                memsetb((void *) kpage, PAGE_SIZE, 0);
+                                km_temporary_page_put(kpage);
                                 
                                 /*
@@ -201 +204 @@
                                  */
                                 btree_insert(&area->sh_info->pagemap,
-                                    ALIGN_DOWN(addr, PAGE_SIZE) - area->base,
-                                    (void *) frame, leaf);
+                                    upage - area->base, (void *) frame, leaf);
                         }
                 }
@@ -223 +225 @@
                  *   the different causes
                  */
-                frame = (uintptr_t) frame_alloc_noreserve(ONE_FRAME, 0);
-                memsetb((void *) PA2KA(frame), FRAME_SIZE, 0);
+                kpage = km_temporary_page_get(&frame, FRAME_NO_RESERVE);
+                memsetb((void *) kpage, PAGE_SIZE, 0);
+                km_temporary_page_put(kpage);
         }
         
         /*
-         * Map 'page' to 'frame'.
+         * Map 'upage' to 'frame'.
          * Note that TLB shootdown is not attempted as only new information is
          * being inserted into page tables.
          */
-        page_mapping_insert(AS, addr, frame, as_area_get_flags(area));
-        if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))
+        page_mapping_insert(AS, upage, frame, as_area_get_flags(area));
+        if (!used_space_insert(area, upage, 1))
                 panic("Cannot insert used space.");