efi_loader: helper function to add EFI object to list

[oweals/u-boot.git] / lib / efi_loader / efi_boottime.c

diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 0fb2848ecf9a70b6b8f0eaff472106ca695f2526..a37fb25638ce35aea864a6d7c0ae92b18bdaaafd 100644 (file)
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -321,6 +321,23 @@ static efi_status_t EFIAPI efi_free_pool_ext(void *buffer)
        return EFI_EXIT(r);
 }
 
+/*
+ * Add a new object to the object list.
+ *
+ * The protocols list is initialized.
+ * The object handle is set.
+ *
+ * @obj        object to be added
+ */
+void efi_add_handle(struct efi_object *obj)
+{
+       if (!obj)
+               return;
+       INIT_LIST_HEAD(&obj->protocols);
+       obj->handle = obj;
+       list_add_tail(&obj->link, &efi_obj_list);
+}
+
 /*
  * Create handle.
  *
@@ -337,11 +354,8 @@ efi_status_t efi_create_handle(void **handle)
                              (void **)&obj);
        if (r != EFI_SUCCESS)
                return r;
-       memset(obj, 0, sizeof(struct efi_object));
-       obj->handle = obj;
-       INIT_LIST_HEAD(&obj->protocols);
-       list_add_tail(&obj->link, &efi_obj_list);
-       *handle = obj;
+       efi_add_handle(obj);
+       *handle = obj->handle;
        return r;
 }
 
@@ -1163,14 +1177,15 @@ void efi_setup_loaded_image(struct efi_loaded_image *info, struct efi_object *ob
 {
        efi_status_t ret;
 
+       /* Add internal object to object list */
+       efi_add_handle(obj);
+       /* efi_exit() assumes that the handle points to the info */
        obj->handle = info;
 
        info->file_path = file_path;
        if (device_path)
                info->device_handle = efi_dp_find_obj(device_path, NULL);
 
-       INIT_LIST_HEAD(&obj->protocols);
-       list_add_tail(&obj->link, &efi_obj_list);
        /*
         * When asking for the device path interface, return
         * bootefi_device_path
@@ -1379,6 +1394,17 @@ static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
                        efi_status_t exit_status, unsigned long exit_data_size,
                        int16_t *exit_data)
 {
+       /*
+        * We require that the handle points to the original loaded
+        * image protocol interface.
+        *
+        * For getting the longjmp address this is safer than locating
+        * the protocol because the protocol may have been reinstalled
+        * pointing to another memory location.
+        *
+        * TODO: We should call the unload procedure of the loaded
+        *       image protocol.
+        */
        struct efi_loaded_image *loaded_image_info = (void*)image_handle;
 
        EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,