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cmd: add efidebug command 

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>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
AKASHI Takahiro 2019-02-25 15:54:38 +09:00 committed by Heinrich Schuchardt
parent 454568b4f0
commit 59df7e7e77
4 changed files with 599 additions and 0 deletions
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1
MAINTAINERS
View File

@ -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

10
cmd/Kconfig
View File

@ -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"
depends on LED

1
cmd/Makefile
View File

@ -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

587
cmd/efidebug.c Normal file
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@ -0,0 +1,587 @@
// 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>
#define RT systab.runtime
/**
* do_efi_boot_add() - set UEFI load 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 load 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 = LOAD_OPTION_ACTIVE; /* always ACTIVE */
/* 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_CALL(RT->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 load 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 load 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_CALL(RT->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 load option
*
* @id: Load option number
* @data: Value of UEFI load option variable
*
* Decode the value of UEFI load 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 & LOAD_OPTION_ACTIVE ? 'A' : '-',
/* FORCE RECONNECT */
lo.attributes & LOAD_OPTION_FORCE_RECONNECT ? 'R' : '-',
/* HIDDEN */
lo.attributes & LOAD_OPTION_HIDDEN ? 'H' : '-',
lo.attributes);
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 load option
*
* @id: Load option number
*
* Dump information defined by UEFI load 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_CALL(RT->get_variable(var_name16, &guid, NULL, &size, NULL));
if (ret == (int)EFI_BUFFER_TOO_SMALL) {
data = malloc(size);
ret = EFI_CALL(RT->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 load 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 load 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 load options
*
* Return: CMD_RET_SUCCESS on success, CMD_RET_RET_FAILURE on failure
*
* Show order of UEFI load 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_CALL(RT->get_variable(L"BootOrder", &guid, NULL, &size,
NULL));
if (ret == EFI_BUFFER_TOO_SMALL) {
bootorder = malloc(size);
ret = EFI_CALL(RT->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_CALL(RT->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_CALL(RT->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_CALL(RT->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 load 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_CALL(RT->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 load 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 display 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
);