Changeset 7242a78e in mainline for generic/src/mm/as.c

Timestamp:

2006-05-11T16:05:02Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

8d4f2ae

Parents:

cfffb000

Message:

Add SYS_AS_AREA_DESTROY syscall.
Add few error codes to errno.h
and change as.c accordingly.

File:

• generic/src/mm/as.c (modified) (8 diffs)

generic/src/mm/as.c

@@ -195 +195 @@
  * @param flags Flags influencing the remap operation. Currently unused.
  *
- * @return address on success, (__address) -1 otherwise.
+ * @return Zero on success or a value from @ref errno.h otherwise.
  */ 
-__address as_area_resize(as_t *as, __address address, size_t size, int flags)
-{
-        as_area_t *area = NULL;
+int as_area_resize(as_t *as, __address address, size_t size, int flags)
+{
+        as_area_t *area;
         ipl_t ipl;
         size_t pages;
@@ -213 +213 @@
                 spinlock_unlock(&as->lock);
                 interrupts_restore(ipl);
-                return (__address) -1;
+                return ENOENT;
         }
 
@@ -224 +224 @@
                 spinlock_unlock(&as->lock);
                 interrupts_restore(ipl);
-                return (__address) -1;
+                return ENOTSUP;
         }
 
@@ -235 +235 @@
                 spinlock_unlock(&as->lock);
                 interrupts_restore(ipl);
-                return (__address) -1;
+                return EPERM;
         }
         
@@ -282 +282 @@
                         spinlock_unlock(&as->lock);             
                         interrupts_restore(ipl);
-                        return (__address) -1;
+                        return EADDRNOTAVAIL;
                 }
         } 
@@ -292 +292 @@
         interrupts_restore(ipl);
 
-        return address;
+        return 0;
+}
+
+/** Destroy address space area.
+ *
+ * @param as Address space.
+ * @param address Address withing the area to be deleted.
+ *
+ * @return Zero on success or a value from @ref errno.h on failure. 
+ */
+int as_area_destroy(as_t *as, __address address)
+{
+        as_area_t *area;
+        __address base;
+        ipl_t ipl;
+        int i;
+
+        ipl = interrupts_disable();
+        spinlock_lock(&as->lock);
+
+        area = find_area_and_lock(as, address);
+        if (!area) {
+                spinlock_unlock(&as->lock);
+                interrupts_restore(ipl);
+                return ENOENT;
+        }
+
+        base = area->base;      
+        for (i = 0; i < area->pages; i++) {
+                pte_t *pte;
+
+                /*
+                 * Releasing physical memory.
+                 * Areas mapping memory-mapped devices are treated differently than
+                 * areas backing frame_alloc()'ed memory.
+                 */
+                page_table_lock(as, false);
+                pte = page_mapping_find(as, area->base + i*PAGE_SIZE);
+                if (pte && PTE_VALID(pte)) {
+                        ASSERT(PTE_PRESENT(pte));
+                        page_mapping_remove(as, area->base + i*PAGE_SIZE);
+                        if (area->flags & AS_AREA_DEVICE) {
+                                __address frame;
+                                frame = PTE_GET_FRAME(pte);
+                                frame_free(ADDR2PFN(frame));
+                        }
+                        page_table_unlock(as, false);
+                } else {
+                        page_table_unlock(as, false);
+                }
+        }
+        /*
+         * Invalidate TLB's.
+         */
+        tlb_shootdown_start(TLB_INVL_PAGES, AS->asid, area->base, area->pages);
+        tlb_invalidate_pages(AS->asid, area->base, area->pages);
+        tlb_shootdown_finalize();
+
+        spinlock_unlock(&area->lock);
+
+        /*
+         * Remove the empty area from address space.
+         */
+        btree_remove(&AS->as_area_btree, base, NULL);
+        
+        spinlock_unlock(&AS->lock);
+        interrupts_restore(ipl);
+        return 0;
 }
 
@@ -308 +375 @@
  * @param src_base Base address of the source address space area.
  *
- * @return 0 on success or ENOENT if there is no such task or
+ * @return Zero on success or ENOENT if there is no such task or
  *         if there is no such address space area,
  *         EPERM if there was a problem in accepting the area or
@@ -892 +959 @@
 __native sys_as_area_resize(__address address, size_t size, int flags)
 {
-        return as_area_resize(AS, address, size, 0);
+        return (__native) as_area_resize(AS, address, size, 0);
+}
+
+/** Wrapper for as_area_destroy. */
+__native sys_as_area_destroy(__address address)
+{
+        return (__native) as_area_destroy(AS, address);
 }