[U-Boot] [PATCH v13 2/4] efi: Split out test init/uninit into functions

[Simon Glass]

The functions in bootefi are very long because they mix high-level code
and control with the low-level implementation. To help with this, create
functions which handle preparing for running the test and cleaning up
afterwards.

Also shorten the awfully long variable names here.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v13: None
Changes in v12:
- Rename image to image_prot

Changes in v11: None
Changes in v9:
- Add comments to bootefi_test_prepare() about the memset()s

Changes in v7: None
Changes in v5:
- Drop call to efi_init_obj_list() which is now done in do_bootefi()

Changes in v4: None
Changes in v3:
- Add new patch to split out test init/uninit into functions

 cmd/bootefi.c | 85 +++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 65 insertions(+), 20 deletions(-)

diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 3e37805ea13..91e6046cf5f 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -453,6 +453,64 @@ exit:
 	return ret;
 }
 
+#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
+/**
+ * bootefi_test_prepare() - prepare to run an EFI test
+ *
+ * This sets things up so we can call EFI functions. This involves preparing
+ * the 'gd' pointer and setting up the load ed image data structures.
+ *
+ * @image: Pointer to a struct which will hold the loaded image info.
+ *    This struct will be inited by this function before use.
+ * @obj: Pointer to a struct which will hold the loaded image object
+ *    This struct will be inited by this function before use.
+ * @path: File path to the test being run (often just the test name with a
+ *    backslash before it
+ * @test_func: Address of the test function that is being run
+ * @return 0 if OK, -ve on error
+ */
+static efi_status_t bootefi_test_prepare(struct efi_loaded_image **imagep,
+					 struct efi_loaded_image_obj **objp,
+					 const char *path, ulong test_func)
+{
+	efi_status_t r;
+
+	/* Construct a dummy device path */
+	bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
+					      (uintptr_t)test_func,
+					      (uintptr_t)test_func);
+	bootefi_image_path = efi_dp_from_file(NULL, 0, path);
+	r = efi_setup_loaded_image(bootefi_device_path, bootefi_image_path,
+				   objp, imagep);
+	if (r)
+		return r;
+	/*
+	 * gd lives in a fixed register which may get clobbered while we execute
+	 * the payload. So save it here and restore it on every callback entry
+	 */
+	efi_save_gd();
+
+	/* Transfer environment variable efi_selftest as load options */
+	set_load_options(*imagep, "efi_selftest");
+
+	return 0;
+}
+
+/**
+ * bootefi_test_finish() - finish up after running an EFI test
+ *
+ * @image_prot: Pointer to a struct which holds the loaded image info
+ * @obj: Pointer to a struct which holds the loaded image object
+ */
+static void bootefi_test_finish(struct efi_loaded_image *image_prot,
+				struct efi_loaded_image_obj *obj)
+{
+	efi_restore_gd();
+	free(image_prot->load_options);
+	efi_delete_handle(&obj->header);
+}
+#endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
+
 static int do_bootefi_bootmgr_exec(void)
 {
 	struct efi_device_path *device_path, *file_path;
@@ -525,29 +583,16 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #endif
 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 	if (!strcmp(argv[1], "selftest")) {
-		struct efi_loaded_image_obj *image_obj;
-		struct efi_loaded_image *loaded_image_info;
-
-		/* Construct a dummy device path. */
-		bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
-						      (uintptr_t)&efi_selftest,
-						      (uintptr_t)&efi_selftest);
-		bootefi_image_path = efi_dp_from_file(NULL, 0, "\\selftest");
-
-		r = efi_setup_loaded_image(bootefi_device_path,
-					   bootefi_image_path, &image_obj,
-					   &loaded_image_info);
-		if (r != EFI_SUCCESS)
+		struct efi_loaded_image *image_prot;
+		struct efi_loaded_image_obj *obj;
+
+		if (bootefi_test_prepare(&image_prot, &obj, "\\selftest",
+					 (uintptr_t)&efi_selftest))
 			return CMD_RET_FAILURE;
 
-		efi_save_gd();
-		/* Transfer environment variable efi_selftest as load options */
-		set_load_options(loaded_image_info, "efi_selftest");
 		/* Execute the test */
-		r = efi_selftest(&image_obj->header, &systab);
-		efi_restore_gd();
-		free(loaded_image_info->load_options);
-		efi_delete_handle(&image_obj->header);
+		r = efi_selftest(&obj->header, &systab);
+		bootefi_test_finish(image_prot, obj);
 		return r != EFI_SUCCESS;
 	} else
 #endif
-- 
2.19.1.930.g4563a0d9d0-goog