Changeset 0ee077ee in mainline for generic/include/mm/as.h

Timestamp:

2006-05-27T17:50:30Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

127c957b

Parents:

fb84455

Message:

Move the sharing functionality to address space area backends.
Add backend for continuous regions of physical memory.
Sharing for these areas works automagically now.

File:

• generic/include/mm/as.h (modified) (6 diffs)

generic/include/mm/as.h

@@ -31 +31 @@
 
 /** Address space area flags. */
-#define AS_AREA_READ    1
-#define AS_AREA_WRITE   2
-#define AS_AREA_EXEC    4
-#define AS_AREA_DEVICE  8
-#define AS_AREA_ANON    16
+#define AS_AREA_READ            1
+#define AS_AREA_WRITE           2
+#define AS_AREA_EXEC            4
+#define AS_AREA_CACHEABLE       8
 
 #ifdef KERNEL
@@ -105 +104 @@
                                              or memcpy_to_uspace(). */
 
-typedef struct share_info share_info_t;
-typedef struct mem_backend mem_backend_t;
+/** This structure contains information associated with the shared address space area. */
+typedef struct {
+        mutex_t lock;           /**< This lock must be acquired only when the as_area lock is held. */
+        count_t refcount;       /**< This structure can be deallocated if refcount drops to 0. */
+        btree_t pagemap;        /**< B+tree containing complete map of anonymous pages of the shared area. */
+} share_info_t;
+
+/** Address space area backend structure. */
+typedef struct {
+        int (* page_fault)(as_area_t *area, __address addr, pf_access_t access);
+        void (* frame_free)(as_area_t *area, __address page, __address frame);
+        void (* share)(as_area_t *area);
+} mem_backend_t;
+
+/** Backend data stored in address space area. */
+typedef struct backend_data {
+        __native d1;
+        __native d2;
+} mem_backend_data_t;
 
 /** Address space area structure.
@@ -115 +131 @@
 struct as_area {
         mutex_t lock;
+        as_t *as;               /**< Containing address space. */
         int flags;              /**< Flags related to the memory represented by the address space area. */
         int attributes;         /**< Attributes related to the address space area itself. */
@@ -121 +138 @@
         btree_t used_space;     /**< Map of used space. */
         share_info_t *sh_info;  /**< If the address space area has been shared, this pointer will
-                                     reference the share info structure. */
+                                     reference the share info structure. */
         mem_backend_t *backend; /**< Memory backend backing this address space area. */
-        void *backend_data[2];  /**< Data to be used by the backend. */
-};
 
-/** Address space area backend structure. */
-struct mem_backend {
-        int (* backend_page_fault)(as_area_t *area, __address addr, pf_access_t access);
-        void (* backend_frame_free)(as_area_t *area, __address page, __address frame);
+        /** Data to be used by the backend. */
+        mem_backend_data_t backend_data;
 };
 
@@ -141 +154 @@
 extern as_t *as_create(int flags);
 extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs,
-        mem_backend_t *backend, void **backend_data);
+        mem_backend_t *backend, mem_backend_data_t *backend_data);
 extern int as_area_resize(as_t *as, __address address, size_t size, int flags);
 extern int as_area_destroy(as_t *as, __address address);
 extern int as_area_get_flags(as_area_t *area);
-extern void as_set_mapping(as_t *as, __address page, __address frame);
 extern bool as_area_check_access(as_area_t *area, pf_access_t access);
 extern int as_page_fault(__address page, pf_access_t access, istate_t *istate);
@@ -164 +176 @@
 extern mem_backend_t anon_backend;
 extern mem_backend_t elf_backend;
+extern mem_backend_t phys_backend;
 
 /* Address space area related syscalls. */