Changes in kernel/generic/src/mm/backend_anon.c [0705fc5:2fc3b2d] in mainline

File:

• kernel/generic/src/mm/backend_anon.c (modified) (5 diffs)

kernel/generic/src/mm/backend_anon.c

@@ -48 +48 @@
 #include <synch/mutex.h>
 #include <adt/list.h>
-#include <adt/btree.h>
 #include <errno.h>
 #include <typedefs.h>
@@ -122 +121 @@
          */
         mutex_lock(&area->sh_info->lock);
-        list_foreach(area->used_space.leaf_list, leaf_link, btree_node_t,
-            node) {
-                unsigned int i;
-
-                for (i = 0; i < node->keys; i++) {
-                        uintptr_t base = node->key[i];
-                        size_t count = (size_t) node->value[i];
-                        unsigned int j;
-
-                        for (j = 0; j < count; j++) {
-                                pte_t pte;
-                                bool found;
-
-                                page_table_lock(area->as, false);
-                                found = page_mapping_find(area->as,
-                                    base + P2SZ(j), false, &pte);
-
-                                (void)found;
-                                assert(found);
-                                assert(PTE_VALID(&pte));
-                                assert(PTE_PRESENT(&pte));
-
-                                btree_insert(&area->sh_info->pagemap,
-                                    (base + P2SZ(j)) - area->base,
-                                    (void *) PTE_GET_FRAME(&pte), NULL);
-                                page_table_unlock(area->as, false);
-
-                                pfn_t pfn = ADDR2PFN(PTE_GET_FRAME(&pte));
-                                frame_reference_add(pfn);
-                        }
-
+        used_space_ival_t *ival = used_space_first(&area->used_space);
+        while (ival != NULL) {
+                uintptr_t base = ival->page;
+                size_t count = ival->count;
+                unsigned int j;
+
+                for (j = 0; j < count; j++) {
+                        pte_t pte;
+                        bool found;
+
+                        page_table_lock(area->as, false);
+                        found = page_mapping_find(area->as, base + P2SZ(j),
+                            false, &pte);
+
+                        (void)found;
+                        assert(found);
+                        assert(PTE_VALID(&pte));
+                        assert(PTE_PRESENT(&pte));
+
+                        as_pagemap_insert(&area->sh_info->pagemap,
+                            (base + P2SZ(j)) - area->base, PTE_GET_FRAME(&pte));
+                        page_table_unlock(area->as, false);
+
+                        pfn_t pfn = ADDR2PFN(PTE_GET_FRAME(&pte));
+                        frame_reference_add(pfn);
                 }
+
+                ival = used_space_next(ival);
         }
         mutex_unlock(&area->sh_info->lock);
@@ -201 +196 @@
         mutex_lock(&area->sh_info->lock);
         if (area->sh_info->shared) {
-                btree_node_t *leaf;
-
                 /*
                  * The area is shared, chances are that the mapping can be found
@@ -210 +203 @@
                  * mapping, a new frame is allocated and the mapping is created.
                  */
-                frame = (uintptr_t) btree_search(&area->sh_info->pagemap,
-                    upage - area->base, &leaf);
-                if (!frame) {
-                        bool allocate = true;
-                        unsigned int i;
+                errno_t rc = as_pagemap_find(&area->sh_info->pagemap,
+                    upage - area->base, &frame);
+                if (rc != EOK) {
+                        /* Need to allocate the frame */
+                        kpage = km_temporary_page_get(&frame,
+                            FRAME_NO_RESERVE);
+                        memsetb((void *) kpage, PAGE_SIZE, 0);
+                        km_temporary_page_put(kpage);
 
                         /*
-                         * Zero can be returned as a valid frame address.
-                         * Just a small workaround.
+                         * Insert the address of the newly allocated
+                         * frame to the pagemap.
                          */
-                        for (i = 0; i < leaf->keys; i++) {
-                                if (leaf->key[i] == upage - area->base) {
-                                        allocate = false;
-                                        break;
-                                }
-                        }
-                        if (allocate) {
-                                kpage = km_temporary_page_get(&frame,
-                                    FRAME_NO_RESERVE);
-                                memsetb((void *) kpage, PAGE_SIZE, 0);
-                                km_temporary_page_put(kpage);
-
-                                /*
-                                 * Insert the address of the newly allocated
-                                 * frame to the pagemap.
-                                 */
-                                btree_insert(&area->sh_info->pagemap,
-                                    upage - area->base, (void *) frame, leaf);
-                        }
+                        as_pagemap_insert(&area->sh_info->pagemap,
+                            upage - area->base, frame);
                 }
                 frame_reference_add(ADDR2PFN(frame));
@@ -280 +259 @@
          */
         page_mapping_insert(AS, upage, frame, as_area_get_flags(area));
-        if (!used_space_insert(area, upage, 1))
+        if (!used_space_insert(&area->used_space, upage, 1))
                 panic("Cannot insert used space.");