Changes in kernel/generic/src/ddi/ddi.c [bf9cb2f:8cd680c] in mainline

File:

• kernel/generic/src/ddi/ddi.c (modified) (4 diffs)

kernel/generic/src/ddi/ddi.c

@@ -211 +211 @@
 NO_TRACE static int physmem_unmap(uintptr_t virt)
 {
-        // TODO: implement unmap
-        return EOK;
+        ASSERT(TASK);
+
+        return as_area_destroy(TASK->as, virt);
 }
 
@@ -255 +256 @@
 /** Enable range of I/O space for task.
  *
- * @param id Task ID of the destination task.
+ * @param id     Task ID of the destination task.
  * @param ioaddr Starting I/O address.
- * @param size Size of the enabled I/O space..
+ * @param size   Size of the enabled I/O space.
  *
  * @return 0 on success, EPERM if the caller lacks capabilities to use this
@@ -290 +291 @@
         int rc = ddi_iospace_enable_arch(task, ioaddr, size);
         irq_spinlock_unlock(&task->lock, true);
+
+        return rc;
+}
+
+/** Disable range of I/O space for task.
+ *
+ * @param id     Task ID of the destination task.
+ * @param ioaddr Starting I/O address.
+ * @param size   Size of the enabled I/O space.
+ *
+ * @return 0 on success, EPERM if the caller lacks capabilities to use this
+ *           syscall, ENOENT if there is no task matching the specified ID.
+ *
+ */
+NO_TRACE static int iospace_disable(task_id_t id, uintptr_t ioaddr, size_t size)
+{
+        /*
+         * Make sure the caller is authorised to make this syscall.
+         */
+        cap_t caps = cap_get(TASK);
+        if (!(caps & CAP_IO_MANAGER))
+                return EPERM;
+        
+        irq_spinlock_lock(&tasks_lock, true);
+        
+        task_t *task = task_find_by_id(id);
+        
+        if ((!task) || (!container_check(CONTAINER, task->container))) {
+                /*
+                 * There is no task with the specified ID
+                 * or the task belongs to a different security
+                 * context.
+                 */
+                irq_spinlock_unlock(&tasks_lock, true);
+                return ENOENT;
+        }
+        
+        /* Lock the task and release the lock protecting tasks_btree. */
+        irq_spinlock_exchange(&tasks_lock, &task->lock);
+        int rc = ddi_iospace_disable_arch(task, ioaddr, size);
+        irq_spinlock_unlock(&task->lock, true);
         
         return rc;
@@ -314 +356 @@
 sysarg_t sys_iospace_disable(ddi_ioarg_t *uspace_io_arg)
 {
-        // TODO: implement
-        return ENOTSUP;
+        ddi_ioarg_t arg;
+        int rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
+        if (rc != 0)
+                return (sysarg_t) rc;
+
+        return (sysarg_t) iospace_disable((task_id_t) arg.task_id,
+            (uintptr_t) arg.ioaddr, (size_t) arg.size);
 }