This jumps to test code which can call directly into the EFI support. It
does not need a separate image so it is easy to write tests with it.

For now the test just outputs a message. To try it:

./sandbox/u-boot -c "bootefi test"
U-Boot 2017.09-00204-g696c9855fe (Sep 17 2017 - 16:43:53 -0600)

DRAM:  128 MiB
MMC:
Using default environment

In:    serial
Out:   serial
Err:   serial
SCSI:  Net:   No ethernet found.
IDE:   Bus 0: not available
Found 0 disks
Hello, world!
Test passed

Signed-off-by: Simon Glass <s...@chromium.org>
---

Changes in v2:
- Rebase to master

 cmd/bootefi.c             | 25 +++++++++++++++++++++++--
 configs/sandbox_defconfig |  1 +
 include/efi_loader.h      |  3 +++
 lib/efi_loader/Kconfig    | 10 ++++++++++
 lib/efi_loader/Makefile   |  1 +
 lib/efi_loader/efi_test.c | 17 +++++++++++++++++
 6 files changed, 55 insertions(+), 2 deletions(-)
 create mode 100644 lib/efi_loader/efi_test.c

diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index a4686f17f0..a77d8b256e 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -148,13 +148,11 @@ static unsigned long do_bootefi_exec(void *efi, void *fdt,
        struct efi_object loaded_image_info_obj = {};
        struct efi_device_path *memdp = NULL;
        ulong ret;
-
        ulong (*entry)(void *image_handle, struct efi_system_table *st)
                asmlinkage;
        ulong fdt_pages, fdt_size, fdt_start, fdt_end;
        const efi_guid_t fdt_guid = EFI_FDT_GUID;
        bootm_headers_t img = { 0 };
-       int ret;
 
        /*
         * Special case for efi payload not loaded from disk, such as
@@ -318,6 +316,29 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int 
argc, char * const argv[])
                memcpy((char *)addr, __efi_helloworld_begin, size);
        } else
 #endif
+       if (IS_ENABLED(CONFIG_BOOTEFI_TEST) && !strcmp(argv[1], "test")) {
+               int ret;
+
+               /* Initialize and populate EFI object list */
+               if (efi_init_obj_list())
+                       return CMD_RET_FAILURE;
+
+               struct efi_loaded_image loaded_image_info = {};
+               struct efi_object loaded_image_info_obj = {};
+
+               efi_setup_loaded_image(&loaded_image_info,
+                                      &loaded_image_info_obj,
+                                      bootefi_device_path, bootefi_image_path);
+
+               ret = efi_test(&loaded_image_info, &systab);
+               if (ret) {
+                       printf("Test failed: err=%d\n", ret);
+                       return CMD_RET_FAILURE;
+               }
+               printf("Test passed\n");
+
+               return 0;
+       }
 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
        if (!strcmp(argv[1], "selftest")) {
                struct efi_loaded_image loaded_image_info = {};
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 08eec8ecc6..ccf142c51d 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -194,3 +194,4 @@ CONFIG_UT_TIME=y
 CONFIG_UT_DM=y
 CONFIG_UT_ENV=y
 CONFIG_UT_OVERLAY=y
+CONFIG_CMD_BOOTEFI_SELFTEST=y
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 35f8f84401..90018fbe9e 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -335,6 +335,9 @@ efi_status_t EFIAPI efi_set_variable(s16 *variable_name,
 void *efi_bootmgr_load(struct efi_device_path **device_path,
                       struct efi_device_path **file_path);
 
+/* Perform EFI tests */
+int efi_test(efi_handle_t image_handle, struct efi_system_table *systab);
+
 #else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
 
 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index dee0a96a98..659b2b18f4 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -16,3 +16,13 @@ config EFI_LOADER_BOUNCE_BUFFER
          Some hardware does not support DMA to full 64bit addresses. For this
          hardware we can create a bounce buffer so that payloads don't have to
          worry about platform details.
+
+config BOOTEFI_TEST
+       bool "Provide a test for the EFI loader"
+       depends on EFI_LOADER && SANDBOX
+       default y
+       help
+         Provides a test of the EFI loader functionality accessed via the
+         command line ('bootefi test'). This runs within U-Boot so does not
+         need a separate EFI application to work. It aims to include coverage
+         of all EFI code which can be accessed within sandbox.
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index ddb978f650..14ef85cc67 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -23,3 +23,4 @@ obj-$(CONFIG_DM_VIDEO) += efi_gop.o
 obj-$(CONFIG_PARTITIONS) += efi_disk.o
 obj-$(CONFIG_NET) += efi_net.o
 obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += efi_smbios.o
+obj-$(CONFIG_BOOTEFI_TEST) += efi_test.o
diff --git a/lib/efi_loader/efi_test.c b/lib/efi_loader/efi_test.c
new file mode 100644
index 0000000000..3fdce78b05
--- /dev/null
+++ b/lib/efi_loader/efi_test.c
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2017, Google Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <efi_api.h>
+
+int efi_test(efi_handle_t image_handle, struct efi_system_table *systable)
+{
+       struct efi_simple_text_output_protocol *con_out = systable->con_out;
+
+       con_out->output_string(con_out, L"Hello, world!\n");
+
+       return 0;
+}
-- 
2.15.0.531.g2ccb3012c9-goog

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