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efi_loader: Add a test app

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Add a simple app to use for testing. This is intended to do whatever it
needs to for testing purposes. For now it just prints a message and
exits boot services.

There was a considerable amount of discussion about whether it is OK to
call exit-boot-services and then return to U-Boot. This is not normally
done in a real application, since exit-boot-services is used to
completely disconnect from U-Boot. For now, this part is skipped.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Simon Glass 2024-11-07 14:31:41 -07:00 • committed by Heinrich Schuchardt
parent b1e9a8bba4
commit 34d2faaef6
3 changed files with 67 additions and 0 deletions
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56
lib/efi_loader/testapp.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* EFI test application
*
* Copyright 2024 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*
* This test program is used to test the invocation of an EFI application.
* It writes a few messages to the console and then exits boot services
*/
#include <efi_api.h>
static const efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
static struct efi_system_table *systable;
static struct efi_boot_services *boottime;
static struct efi_simple_text_output_protocol *con_out;
/**
* efi_main() - entry point of the EFI application.
*
* @handle: handle of the loaded image
* @systab: system table
* Return: status code
*/
efi_status_t EFIAPI efi_main(efi_handle_t handle,
struct efi_system_table *systab)
{
struct efi_loaded_image *loaded_image;
efi_status_t ret;
systable = systab;
boottime = systable->boottime;
con_out = systable->con_out;
/* Get the loaded image protocol */
ret = boottime->open_protocol(handle, &loaded_image_guid,
(void **)&loaded_image, NULL, NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (ret != EFI_SUCCESS) {
con_out->output_string
(con_out, u"Cannot open loaded image protocol\r\n");
goto out;
}
/* UEFI requires CR LF */
con_out->output_string(con_out, u"U-Boot test app for EFI_LOADER\r\n");
out:
con_out->output_string(con_out, u"Exiting test app\n");
ret = boottime->exit(handle, ret, 0, NULL);
/* We should never arrive here */
return ret;
}