Changeset 7aaed09 in mainline for kernel/generic/src/mm/page.c

Timestamp:

2011-12-18T14:02:30Z (12 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

c868e2d

Parents:

3b71e84d (diff), 1761268 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge mainline changes.

File:

• kernel/generic/src/mm/page.c (modified) (2 diffs)

kernel/generic/src/mm/page.c

@@ -53 +53 @@
  * We assume that the other processors are either not using the mapping yet
  * (i.e. during the bootstrap) or are executing the TLB shootdown code.  While
- * we don't care much about the former case, the processors in the latter case 
+ * we don't care much about the former case, the processors in the latter case
  * will do an implicit serialization by virtue of running the TLB shootdown
  * interrupt handler.
@@ -198 +198 @@
 }
 
+int page_find_mapping(uintptr_t virt, void **phys)
+{
+        mutex_lock(&AS->lock);
+        
+        pte_t *pte = page_mapping_find(AS, virt, false);
+        if ((!PTE_VALID(pte)) || (!PTE_PRESENT(pte))) {
+                mutex_unlock(&AS->lock);
+                return ENOENT;
+        }
+        
+        *phys = (void *) PTE_GET_FRAME(pte) +
+            (virt - ALIGN_DOWN(virt, PAGE_SIZE));
+        
+        mutex_unlock(&AS->lock);
+        
+        return EOK;
+}
 
 /** Syscall wrapper for getting mapping of a virtual page.
- * 
- * @retval EOK Everything went find, @p uspace_frame and @p uspace_node
- *             contains correct values.
- * @retval ENOENT Virtual address has no mapping.
- */
-sysarg_t sys_page_find_mapping(uintptr_t virt_address,
-    uintptr_t *uspace_frame)
-{
-        mutex_lock(&AS->lock);
-        
-        pte_t *pte = page_mapping_find(AS, virt_address, false);
-        if (!PTE_VALID(pte) || !PTE_PRESENT(pte)) {
-                mutex_unlock(&AS->lock);
-                
-                return (sysarg_t) ENOENT;
-        }
-        
-        uintptr_t phys_address = PTE_GET_FRAME(pte);
-        
-        mutex_unlock(&AS->lock);
-        
-        int rc = copy_to_uspace(uspace_frame,
-            &phys_address, sizeof(phys_address));
-        if (rc != EOK) {
-                return (sysarg_t) rc;
-        }
-        
-        return EOK;
+ *
+ * @return EOK on success.
+ * @return ENOENT if no virtual address mapping found.
+ *
+ */
+sysarg_t sys_page_find_mapping(uintptr_t virt, void *phys_ptr)
+{
+        void *phys;
+        int rc = page_find_mapping(virt, &phys);
+        if (rc != EOK)
+                return rc;
+        
+        rc = copy_to_uspace(phys_ptr, &phys, sizeof(phys));
+        return (sysarg_t) rc;
 }