Changeset c6ae4c2 in mainline for uspace/lib/c/generic/as.c

Timestamp:

2011-12-16T21:12:52Z (13 years ago)

Author:

Martin Decky <martin@…>

Branches:

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

Children:

c8751452

Parents:

e2718e1

Message:

implement basic DMA memory mapping routines
no persistent locking (pinning) of the DMA memory is currently implemented (this can be dangerous)
no unmapping is implemented
special allocations (< 16 MB, < 4 GB) are not supported yet

File:

• uspace/lib/c/generic/as.c (modified) (1 diff)

uspace/lib/c/generic/as.c

@@ -117 +117 @@
 /** Find mapping to physical address.
  *
- * @param address Virtual address in question (virtual).
- * @param[out] frame Frame address (physical).
- * @return Error code.
- * @retval EOK No error, @p frame holds the translation.
- * @retval ENOENT Mapping not found.
+ * @param      virt Virtual address to find mapping for.
+ * @param[out] phys Physical adress.
+ *
+ * @return EOK on no error.
+ * @retval ENOENT if no mapping was found.
+ *
  */
-int as_get_physical_mapping(const void *address, uintptr_t *frame)
+int as_get_physical_mapping(const void *virt, uintptr_t *phys)
 {
-        uintptr_t tmp_frame;
-        uintptr_t virt = (uintptr_t) address;
-        
-        int rc = (int) __SYSCALL2(SYS_PAGE_FIND_MAPPING,
-            (sysarg_t) virt, (sysarg_t) &tmp_frame);
-        if (rc != EOK) {
-                return rc;
-        }
-        
-        if (frame != NULL) {
-                *frame = tmp_frame;
-        }
-        
-        return EOK;
+        return (int) __SYSCALL2(SYS_PAGE_FIND_MAPPING, (sysarg_t) virt,
+            (sysarg_t) phys);
 }