From mboxrd@z Thu Jan  1 00:00:00 1970
From: AKASHI Takahiro <takahiro.akashi@linaro.org>
Date: Fri, 22 Feb 2019 10:04:51 +0900
Subject: [U-Boot] [PATCH v7 2/7] cmd: add efidebug command
In-Reply-To: <c71e46bd-c4af-4174-009a-fc57dc8d1f14@gmx.de>
References: <20190221062652.3641-1-takahiro.akashi@linaro.org>
 <20190221062652.3641-3-takahiro.akashi@linaro.org>
 <c71e46bd-c4af-4174-009a-fc57dc8d1f14@gmx.de>
Message-ID: <20190222010449.GN20286@linaro.org>
List-Id: <u-boot.lists.denx.de>
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To: u-boot@lists.denx.de

On Thu, Feb 21, 2019 at 08:24:21PM +0100, Heinrich Schuchardt wrote:
> On 2/21/19 7:26 AM, AKASHI Takahiro wrote:
> > Currently, there is no easy way to add or modify UEFI variables.
> > In particular, bootmgr supports BootOrder/BootXXXX variables, it is
> > quite hard to define them as u-boot variables because they are represented
> > in a complicated and encoded format.
> > 
> > The new command, efidebug, helps address these issues and give us
> > more friendly interfaces:
> >  * efidebug boot add: add BootXXXX variable
> >  * efidebug boot rm: remove BootXXXX variable
> >  * efidebug boot dump: display all BootXXXX variables
> >  * efidebug boot next: set BootNext variable
> >  * efidebug boot order: set/display a boot order (BootOrder)
> > 
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> > ---
> >  MAINTAINERS    |   1 +
> >  cmd/Kconfig    |  10 +
> >  cmd/Makefile   |   1 +
> >  cmd/efidebug.c | 578 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  4 files changed, 590 insertions(+)
> >  create mode 100644 cmd/efidebug.c
> > 
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 0cce9db2660e..4fabb75eda37 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -471,6 +471,7 @@ F:	lib/efi*/
> >  F:	test/py/tests/test_efi*
> >  F:	test/unicode_ut.c
> >  F:	cmd/bootefi.c
> > +F:	cmd/efidebug.c
> >  F:	cmd/nvedit_efi.c
> >  F:	tools/file2include.c
> >  
> > diff --git a/cmd/Kconfig b/cmd/Kconfig
> > index ddcdee44538d..88b086b074be 100644
> > --- a/cmd/Kconfig
> > +++ b/cmd/Kconfig
> > @@ -1407,6 +1407,16 @@ config CMD_DISPLAY
> >  	  displayed on a simple board-specific display. Implement
> >  	  display_putc() to use it.
> >  
> > +config CMD_EFIDEBUG
> > +	bool "efidebug - display/configure UEFI environment"
> > +	depends on EFI_LOADER
> > +	default n
> > +	help
> > +	  Enable the 'efidebug' command which provides a subset of UEFI
> > +	  shell utility with simplified functionality. It will be useful
> > +	  particularly for managing boot parameters as  well as examining
> > +	  various EFI status for debugging.
> > +
> >  config CMD_LED
> >  	bool "led"
> >  	default y if LED
> > diff --git a/cmd/Makefile b/cmd/Makefile
> > index b9ee51869d48..acb85f49fba8 100644
> > --- a/cmd/Makefile
> > +++ b/cmd/Makefile
> > @@ -51,6 +51,7 @@ obj-$(CONFIG_CMD_ECHO) += echo.o
> >  obj-$(CONFIG_ENV_IS_IN_EEPROM) += eeprom.o
> >  obj-$(CONFIG_CMD_EEPROM) += eeprom.o
> >  obj-$(CONFIG_EFI_STUB) += efi.o
> > +obj-$(CONFIG_CMD_EFIDEBUG) += efidebug.o
> >  obj-$(CONFIG_CMD_ELF) += elf.o
> >  obj-$(CONFIG_HUSH_PARSER) += exit.o
> >  obj-$(CONFIG_CMD_EXT4) += ext4.o
> > diff --git a/cmd/efidebug.c b/cmd/efidebug.c
> > new file mode 100644
> > index 000000000000..641ec98a4d32
> > --- /dev/null
> > +++ b/cmd/efidebug.c
> > @@ -0,0 +1,578 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + *  UEFI Shell-like command
> > + *
> > + *  Copyright (c) 2018 AKASHI Takahiro, Linaro Limited
> > + */
> > +
> > +#include <charset.h>
> > +#include <common.h>
> > +#include <command.h>
> > +#include <efi_loader.h>
> > +#include <environment.h>
> > +#include <exports.h>
> > +#include <malloc.h>
> > +#include <search.h>
> > +#include <linux/ctype.h>
> > +
> > +/**
> > + * do_efi_boot_add() - set UEFI boot option
> > + *
> > + * @cmdtp:	Command table
> > + * @flag:	Command flag
> > + * @argc:	Number of arguments
> > + * @argv:	Argument array
> > + * Return:	CMD_RET_SUCCESS on success,
> > + *		CMD_RET_USAGE or CMD_RET_RET_FAILURE on failure
> > + *
> > + * Implement efidebug "boot add" sub-command.
> > + * Create or change UEFI boot option.
> > + *   - boot add <id> <label> <interface> <devnum>[:<part>] <file> <options>
> > + */
> > +static int do_efi_boot_add(cmd_tbl_t *cmdtp, int flag,
> > +			   int argc, char * const argv[])
> > +{
> > +	int id;
> > +	char *endp;
> > +	char var_name[9];
> > +	u16 var_name16[9], *p;
> > +	efi_guid_t guid;
> > +	size_t label_len, label_len16;
> > +	u16 *label;
> > +	struct efi_device_path *device_path = NULL, *file_path = NULL;
> > +	struct efi_load_option lo;
> > +	void *data = NULL;
> > +	efi_uintn_t size;
> > +	int ret;
> > +
> > +	if (argc < 6 || argc > 7)
> > +		return CMD_RET_USAGE;
> > +
> > +	id = (int)simple_strtoul(argv[1], &endp, 16);
> > +	if (*endp != '\0' || id > 0xffff)
> > +		return CMD_RET_FAILURE;
> > +
> > +	sprintf(var_name, "Boot%04X", id);
> > +	p = var_name16;
> > +	utf8_utf16_strncpy(&p, var_name, 9);
> > +
> > +	guid = efi_global_variable_guid;
> > +
> > +	/* attributes */
> > +	lo.attributes = 0x1; /* always ACTIVE */
> 
> I would prefer the usage of a constant.
> 
> We should move the definitions from lib/efi_loader/efi_bootmgr.c to
> efi_api.h:

Okay, but in efi_loader.h as struct efi_load_option is defined there.

> #define LOAD_OPTION_ACTIVE		0x00000001
> #define LOAD_OPTION_FORCE_RECONNECT	0x00000002
> #define LOAD_OPTION_HIDDEN		0x00000008
> 
> And add the missing values:
> 
> #define LOAD_OPTION_CATEGORY		0x00001F00
> #define LOAD_OPTION_CATEGORY_BOOT	0x00000000
> #define LOAD_OPTION_CATEGORY_APP	0x00000100
> 
> > +
> > +	/* label */
> > +	label_len = strlen(argv[2]);
> > +	label_len16 = utf8_utf16_strnlen(argv[2], label_len);
> > +	label = malloc((label_len16 + 1) * sizeof(u16));
> > +	if (!label)
> > +		return CMD_RET_FAILURE;
> > +	lo.label = label; /* label will be changed below */
> > +	utf8_utf16_strncpy(&label, argv[2], label_len);
> > +
> > +	/* file path */
> > +	ret = efi_dp_from_name(argv[3], argv[4], argv[5], &device_path,
> > +			       &file_path);
> > +	if (ret != EFI_SUCCESS) {
> > +		printf("Cannot create device path for \"%s %s\"\n",
> > +		       argv[3], argv[4]);
> > +		ret = CMD_RET_FAILURE;
> > +		goto out;
> > +	}
> > +	lo.file_path = file_path;
> > +	lo.file_path_length = efi_dp_size(file_path)
> > +				+ sizeof(struct efi_device_path); /* for END */
> > +
> > +	/* optional data */
> > +	lo.optional_data = (u8 *)(argc == 6 ? "" : argv[6]);
> > +
> > +	size = efi_serialize_load_option(&lo, (u8 **)&data);
> > +	if (!size) {
> > +		ret = CMD_RET_FAILURE;
> > +		goto out;
> > +	}
> > +
> > +	ret = efi_set_variable(var_name16, &guid,
> > +			       EFI_VARIABLE_BOOTSERVICE_ACCESS |
> > +			       EFI_VARIABLE_RUNTIME_ACCESS, size, data);
> > +	ret = (ret == EFI_SUCCESS ? CMD_RET_SUCCESS : CMD_RET_FAILURE);
> > +out:
> > +	free(data);
> > +	efi_free_pool(device_path);
> > +	efi_free_pool(file_path);
> > +	free(lo.label);
> > +
> > +	return ret;
> > +}
> > +
> > +/**
> > + * do_efi_boot_rm() - delete UEFI boot options
> > + *
> > + * @cmdtp:	Command table
> > + * @flag:	Command flag
> > + * @argc:	Number of arguments
> > + * @argv:	Argument array
> > + * Return:	CMD_RET_SUCCESS on success, CMD_RET_RET_FAILURE on failure
> > + *
> > + * Implement efidebug "boot rm" sub-command.
> > + * Delete UEFI boot options.
> > + *   - boot rm <id> ...
> > + */
> > +static int do_efi_boot_rm(cmd_tbl_t *cmdtp, int flag,
> > +			  int argc, char * const argv[])
> > +{
> > +	efi_guid_t guid;
> > +	int id, i;
> > +	char *endp;
> > +	char var_name[9];
> > +	u16 var_name16[9];
> > +	efi_status_t ret;
> > +
> > +	if (argc == 1)
> > +		return CMD_RET_USAGE;
> > +
> > +	guid = efi_global_variable_guid;
> > +	for (i = 1; i < argc; i++, argv++) {
> > +		id = (int)simple_strtoul(argv[1], &endp, 16);
> > +		if (*endp != '\0' || id > 0xffff)
> > +			return CMD_RET_FAILURE;
> > +
> > +		sprintf(var_name, "Boot%04X", id);
> > +		utf8_utf16_strncpy((u16 **)&var_name16, var_name, 9);
> > +
> > +		ret = efi_set_variable(var_name16, &guid, 0, 0, NULL);
> > +		if (ret) {
> > +			printf("cannot remove Boot%04X", id);
> > +			return CMD_RET_FAILURE;
> > +		}
> > +	}
> > +
> > +	return CMD_RET_SUCCESS;
> > +}
> > +
> > +/**
> > + * show_efi_boot_opt_data() - dump UEFI boot option
> > + *
> > + * @id:		Boot opton number
> > + * @data:	Value of UEFI boot option variable
> > + *
> > + * Decode the value of UEFI boot option variable and print information.
> > + */
> > +static void show_efi_boot_opt_data(int id, void *data)
> > +{
> > +	struct efi_load_option lo;
> > +	char *label, *p;
> > +	size_t label_len16, label_len;
> > +	u16 *dp_str;
> > +
> > +	efi_deserialize_load_option(&lo, data);
> > +
> > +	label_len16 = u16_strlen(lo.label);
> > +	label_len = utf16_utf8_strnlen(lo.label, label_len16);
> > +	label = malloc(label_len + 1);
> > +	if (!label)
> > +		return;
> > +	p = label;
> > +	utf16_utf8_strncpy(&p, lo.label, label_len16);
> > +
> > +	printf("Boot%04X:\n", id);
> > +	printf("\tattributes: %c%c%c (0x%08x)\n",
> > +	       /* ACTIVE */
> > +	       lo.attributes & 0x1 ? 'A' : '-',
> 
> Please, use constants here.

Okay.

> > +	       /* FORCE RECONNECT */
> > +	       lo.attributes & 0x2 ? 'R' : '-',
> > +	       /* HIDDEN */
> > +	       lo.attributes & 0x8 ? 'H' : '-',
> > +	       lo.attributes);
> 
> How about LOAD_OPTION_CATEGORY_APP?
> It is not supported by us yet. So it is not strictly necessary now.

Next time when "boot menu" or "hot key" will be supported.

Thanks,
-Takahiro Akashi

> Otherwise
> 
> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
> 
> 
> > +	printf("\tlabel: %s\n", label);
> > +
> > +	dp_str = efi_dp_str(lo.file_path);
> > +	printf("\tfile_path: %ls\n", dp_str);
> > +	efi_free_pool(dp_str);
> > +
> > +	printf("\tdata: %s\n", lo.optional_data);
> > +
> > +	free(label);
> > +}
> > +
> > +/**
> > + * show_efi_boot_opt() - dump UEFI boot option
> > + *
> > + * @id:		Boot opton number
> > + *
> > + * Dump information defined by UEFI boot option.
> > + */
> > +static void show_efi_boot_opt(int id)
> > +{
> > +	char var_name[9];
> > +	u16 var_name16[9], *p;
> > +	efi_guid_t guid;
> > +	void *data = NULL;
> > +	efi_uintn_t size;
> > +	int ret;
> > +
> > +	sprintf(var_name, "Boot%04X", id);
> > +	p = var_name16;
> > +	utf8_utf16_strncpy(&p, var_name, 9);
> > +	guid = efi_global_variable_guid;
> > +
> > +	size = 0;
> > +	ret = efi_get_variable(var_name16, &guid, NULL, &size, NULL);
> > +	if (ret == (int)EFI_BUFFER_TOO_SMALL) {
> > +		data = malloc(size);
> > +		ret = efi_get_variable(var_name16, &guid, NULL, &size, data);
> > +	}
> > +	if (ret == EFI_SUCCESS)
> > +		show_efi_boot_opt_data(id, data);
> > +	else if (ret == EFI_NOT_FOUND)
> > +		printf("Boot%04X: not found\n", id);
> > +
> > +	free(data);
> > +}
> > +
> > +/**
> > + * show_efi_boot_dump() - dump all UEFI boot options
> > + *
> > + * @cmdtp:	Command table
> > + * @flag:	Command flag
> > + * @argc:	Number of arguments
> > + * @argv:	Argument array
> > + * Return:	CMD_RET_SUCCESS on success, CMD_RET_RET_FAILURE on failure
> > + *
> > + * Implement efidebug "boot dump" sub-command.
> > + * Dump information of all UEFI boot options defined.
> > + *   - boot dump
> > + */
> > +static int do_efi_boot_dump(cmd_tbl_t *cmdtp, int flag,
> > +			    int argc, char * const argv[])
> > +{
> > +	char regex[256];
> > +	char * const regexlist[] = {regex};
> > +	char *variables = NULL, *boot, *value;
> > +	int len;
> > +	int id;
> > +
> > +	if (argc > 1)
> > +		return CMD_RET_USAGE;
> > +
> > +	snprintf(regex, 256, "efi_.*-.*-.*-.*-.*_Boot[0-9A-F]+");
> > +
> > +	/* TODO: use GetNextVariableName? */
> > +	len = hexport_r(&env_htab, '\n', H_MATCH_REGEX | H_MATCH_KEY,
> > +			&variables, 0, 1, regexlist);
> > +
> > +	if (!len)
> > +		return CMD_RET_SUCCESS;
> > +
> > +	if (len < 0)
> > +		return CMD_RET_FAILURE;
> > +
> > +	boot = variables;
> > +	while (*boot) {
> > +		value = strstr(boot, "Boot") + 4;
> > +		id = (int)simple_strtoul(value, NULL, 16);
> > +		show_efi_boot_opt(id);
> > +		boot = strchr(boot, '\n');
> > +		if (!*boot)
> > +			break;
> > +		boot++;
> > +	}
> > +	free(variables);
> > +
> > +	return CMD_RET_SUCCESS;
> > +}
> > +
> > +/**
> > + * show_efi_boot_order() - show order of UEFI boot options
> > + *
> > + * Return:	CMD_RET_SUCCESS on success, CMD_RET_RET_FAILURE on failure
> > + *
> > + * Show order of UEFI boot options defined by BootOrder variable.
> > + */
> > +static int show_efi_boot_order(void)
> > +{
> > +	efi_guid_t guid;
> > +	u16 *bootorder = NULL;
> > +	efi_uintn_t size;
> > +	int num, i;
> > +	char var_name[9];
> > +	u16 var_name16[9], *p16;
> > +	void *data;
> > +	struct efi_load_option lo;
> > +	char *label, *p;
> > +	size_t label_len16, label_len;
> > +	efi_status_t ret;
> > +
> > +	guid = efi_global_variable_guid;
> > +	size = 0;
> > +	ret = efi_get_variable(L"BootOrder", &guid, NULL, &size, NULL);
> > +	if (ret == EFI_BUFFER_TOO_SMALL) {
> > +		bootorder = malloc(size);
> > +		ret = efi_get_variable(L"BootOrder", &guid, NULL, &size,
> > +				       bootorder);
> > +	}
> > +	if (ret == EFI_NOT_FOUND) {
> > +		printf("BootOrder not defined\n");
> > +		ret = CMD_RET_SUCCESS;
> > +		goto out;
> > +	} else if (ret != EFI_SUCCESS) {
> > +		ret = CMD_RET_FAILURE;
> > +		goto out;
> > +	}
> > +
> > +	num = size / sizeof(u16);
> > +	for (i = 0; i < num; i++) {
> > +		sprintf(var_name, "Boot%04X", bootorder[i]);
> > +		p16 = var_name16;
> > +		utf8_utf16_strncpy(&p16, var_name, 9);
> > +
> > +		size = 0;
> > +		ret = efi_get_variable(var_name16, &guid, NULL, &size, NULL);
> > +		if (ret != EFI_BUFFER_TOO_SMALL) {
> > +			printf("%2d: Boot%04X: (not defined)\n",
> > +			       i + 1, bootorder[i]);
> > +			continue;
> > +		}
> > +
> > +		data = malloc(size);
> > +		if (!data) {
> > +			ret = CMD_RET_FAILURE;
> > +			goto out;
> > +		}
> > +		ret = efi_get_variable(var_name16, &guid, NULL, &size, data);
> > +		if (ret != EFI_SUCCESS) {
> > +			free(data);
> > +			ret = CMD_RET_FAILURE;
> > +			goto out;
> > +		}
> > +
> > +		efi_deserialize_load_option(&lo, data);
> > +
> > +		label_len16 = u16_strlen(lo.label);
> > +		label_len = utf16_utf8_strnlen(lo.label, label_len16);
> > +		label = malloc(label_len + 1);
> > +		if (!label) {
> > +			free(data);
> > +			ret = CMD_RET_FAILURE;
> > +			goto out;
> > +		}
> > +		p = label;
> > +		utf16_utf8_strncpy(&p, lo.label, label_len16);
> > +		printf("%2d: Boot%04X: %s\n", i + 1, bootorder[i], label);
> > +		free(label);
> > +
> > +		free(data);
> > +	}
> > +out:
> > +	free(bootorder);
> > +
> > +	return ret;
> > +}
> > +
> > +/**
> > + * do_efi_boot_next() - manage UEFI BootNext variable
> > + *
> > + * @cmdtp:	Command table
> > + * @flag:	Command flag
> > + * @argc:	Number of arguments
> > + * @argv:	Argument array
> > + * Return:	CMD_RET_SUCCESS on success,
> > + *		CMD_RET_USAGE or CMD_RET_RET_FAILURE on failure
> > + *
> > + * Implement efidebug "boot next" sub-command.
> > + * Set BootNext variable.
> > + *   - boot next <id>
> > + */
> > +static int do_efi_boot_next(cmd_tbl_t *cmdtp, int flag,
> > +			    int argc, char * const argv[])
> > +{
> > +	u16 bootnext;
> > +	efi_uintn_t size;
> > +	char *endp;
> > +	efi_guid_t guid;
> > +	efi_status_t ret;
> > +
> > +	if (argc != 2)
> > +		return CMD_RET_USAGE;
> > +
> > +	bootnext = (u16)simple_strtoul(argv[1], &endp, 16);
> > +	if (*endp != '\0' || bootnext > 0xffff) {
> > +		printf("invalid value: %s\n", argv[1]);
> > +		ret = CMD_RET_FAILURE;
> > +		goto out;
> > +	}
> > +
> > +	guid = efi_global_variable_guid;
> > +	size = sizeof(u16);
> > +	ret = efi_set_variable(L"BootNext", &guid,
> > +			       EFI_VARIABLE_BOOTSERVICE_ACCESS |
> > +			       EFI_VARIABLE_RUNTIME_ACCESS, size, &bootnext);
> > +	ret = (ret == EFI_SUCCESS ? CMD_RET_SUCCESS : CMD_RET_FAILURE);
> > +out:
> > +	return ret;
> > +}
> > +
> > +/**
> > + * do_efi_boot_order() - manage UEFI BootOrder variable
> > + *
> > + * @cmdtp:	Command table
> > + * @flag:	Command flag
> > + * @argc:	Number of arguments
> > + * @argv:	Argument array
> > + * Return:	CMD_RET_SUCCESS on success, CMD_RET_RET_FAILURE on failure
> > + *
> > + * Implement efidebug "boot order" sub-command.
> > + * Show order of UEFI boot options, or change it in BootOrder variable.
> > + *   - boot order [<id> ...]
> > + */
> > +static int do_efi_boot_order(cmd_tbl_t *cmdtp, int flag,
> > +			     int argc, char * const argv[])
> > +{
> > +	u16 *bootorder = NULL;
> > +	efi_uintn_t size;
> > +	int id, i;
> > +	char *endp;
> > +	efi_guid_t guid;
> > +	efi_status_t ret;
> > +
> > +	if (argc == 1)
> > +		return show_efi_boot_order();
> > +
> > +	argc--;
> > +	argv++;
> > +
> > +	size = argc * sizeof(u16);
> > +	bootorder = malloc(size);
> > +	if (!bootorder)
> > +		return CMD_RET_FAILURE;
> > +
> > +	for (i = 0; i < argc; i++) {
> > +		id = (int)simple_strtoul(argv[i], &endp, 16);
> > +		if (*endp != '\0' || id > 0xffff) {
> > +			printf("invalid value: %s\n", argv[i]);
> > +			ret = CMD_RET_FAILURE;
> > +			goto out;
> > +		}
> > +
> > +		bootorder[i] = (u16)id;
> > +	}
> > +
> > +	guid = efi_global_variable_guid;
> > +	ret = efi_set_variable(L"BootOrder", &guid,
> > +			       EFI_VARIABLE_BOOTSERVICE_ACCESS |
> > +			       EFI_VARIABLE_RUNTIME_ACCESS, size, bootorder);
> > +	ret = (ret == EFI_SUCCESS ? CMD_RET_SUCCESS : CMD_RET_FAILURE);
> > +out:
> > +	free(bootorder);
> > +
> > +	return ret;
> > +}
> > +
> > +static cmd_tbl_t cmd_efidebug_boot_sub[] = {
> > +	U_BOOT_CMD_MKENT(add, CONFIG_SYS_MAXARGS, 1, do_efi_boot_add, "", ""),
> > +	U_BOOT_CMD_MKENT(rm, CONFIG_SYS_MAXARGS, 1, do_efi_boot_rm, "", ""),
> > +	U_BOOT_CMD_MKENT(dump, CONFIG_SYS_MAXARGS, 1, do_efi_boot_dump, "", ""),
> > +	U_BOOT_CMD_MKENT(next, CONFIG_SYS_MAXARGS, 1, do_efi_boot_next, "", ""),
> > +	U_BOOT_CMD_MKENT(order, CONFIG_SYS_MAXARGS, 1, do_efi_boot_order,
> > +			 "", ""),
> > +};
> > +
> > +/**
> > + * do_efi_boot_opt() - manage UEFI boot options
> > + *
> > + * @cmdtp:	Command table
> > + * @flag:	Command flag
> > + * @argc:	Number of arguments
> > + * @argv:	Argument array
> > + * Return:	CMD_RET_SUCCESS on success,
> > + *		CMD_RET_USAGE or CMD_RET_RET_FAILURE on failure
> > + *
> > + * Implement efidebug "boot" sub-command.
> > + * See above for details of sub-commands.
> > + */
> > +static int do_efi_boot_opt(cmd_tbl_t *cmdtp, int flag,
> > +			   int argc, char * const argv[])
> > +{
> > +	cmd_tbl_t *cp;
> > +
> > +	if (argc < 2)
> > +		return CMD_RET_USAGE;
> > +
> > +	argc--; argv++;
> > +
> > +	cp = find_cmd_tbl(argv[0], cmd_efidebug_boot_sub,
> > +			  ARRAY_SIZE(cmd_efidebug_boot_sub));
> > +	if (!cp)
> > +		return CMD_RET_USAGE;
> > +
> > +	return cp->cmd(cmdtp, flag, argc, argv);
> > +}
> > +
> > +static cmd_tbl_t cmd_efidebug_sub[] = {
> > +	U_BOOT_CMD_MKENT(boot, CONFIG_SYS_MAXARGS, 1, do_efi_boot_opt, "", ""),
> > +};
> > +
> > +/**
> > + * do_efidebug() - display and configure UEFI environment
> > + *
> > + * @cmdtp:	Command table
> > + * @flag:	Command flag
> > + * @argc:	Number of arguments
> > + * @argv:	Argument array
> > + * Return:	CMD_RET_SUCCESS on success,
> > + *		CMD_RET_USAGE or CMD_RET_RET_FAILURE on failure
> > + *
> > + * Implement efidebug command which allows us to dsiplay and
> > + * configure UEFI environment.
> > + * See above for details of sub-commands.
> > + */
> > +static int do_efidebug(cmd_tbl_t *cmdtp, int flag,
> > +		       int argc, char * const argv[])
> > +{
> > +	cmd_tbl_t *cp;
> > +	efi_status_t r;
> > +
> > +	if (argc < 2)
> > +		return CMD_RET_USAGE;
> > +
> > +	argc--; argv++;
> > +
> > +	/* Initialize UEFI drivers */
> > +	r = efi_init_obj_list();
> > +	if (r != EFI_SUCCESS) {
> > +		printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
> > +		       r & ~EFI_ERROR_MASK);
> > +		return CMD_RET_FAILURE;
> > +	}
> > +
> > +	cp = find_cmd_tbl(argv[0], cmd_efidebug_sub,
> > +			  ARRAY_SIZE(cmd_efidebug_sub));
> > +	if (!cp)
> > +		return CMD_RET_USAGE;
> > +
> > +	return cp->cmd(cmdtp, flag, argc, argv);
> > +}
> > +
> > +#ifdef CONFIG_SYS_LONGHELP
> > +static char efidebug_help_text[] =
> > +	"  - UEFI Shell-like interface to configure UEFI environment\n"
> > +	"\n"
> > +	"efidebug boot add <bootid> <label> <interface> <devnum>[:<part>] <file path> [<load options>]\n"
> > +	"  - set UEFI BootXXXX variable\n"
> > +	"    <load options> will be passed to UEFI application\n"
> > +	"efidebug boot rm <bootid#1> [<bootid#2> [<bootid#3> [...]]]\n"
> > +	"  - delete UEFI BootXXXX variables\n"
> > +	"efidebug boot dump\n"
> > +	"  - dump all UEFI BootXXXX variables\n"
> > +	"efidebug boot next <bootid>\n"
> > +	"  - set UEFI BootNext variable\n"
> > +	"efidebug boot order [<bootid#1> [<bootid#2> [<bootid#3> [...]]]]\n"
> > +	"  - set/show UEFI boot order\n"
> > +	"\n";
> > +#endif
> > +
> > +U_BOOT_CMD(
> > +	efidebug, 10, 0, do_efidebug,
> > +	"Configure UEFI environment",
> > +	efidebug_help_text
> > +);
> > 
>