[U-Boot] [PATCH v6 2/7] cmd: add efidebug command
Heinrich Schuchardt
xypron.glpk at gmx.de
Tue Feb 19 19:32:52 UTC 2019
On 1/24/19 12:04 PM, 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 at linaro.org>
I could not make this work on qemu_arm_defconfig:
Usage:
efidebug boot add <bootid> <label> <interface> <device>[:<part>] <file
path> [<load options>]
=> efidebug boot add 00AA 'fancy label' mmc 0:1 wonder.efi '--do-it'
=> efidebug boot dump
=>
I would expect either an error or an output of `dump`.
As the UEFI spec teaches: "Each Boot#### variable is the name “Boot”
appended with a unique four digit hexadecimal number." So 00AA should be
a valid id.
Best regards
Heinrich
> ---
> MAINTAINERS | 1 +
> cmd/Kconfig | 10 ++
> cmd/Makefile | 1 +
> cmd/efidebug.c | 461 +++++++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 473 insertions(+)
> create mode 100644 cmd/efidebug.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 22ac686ab2d6..7ad8c01a3b93 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -438,6 +438,7 @@ 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 812a7eb9b74b..f0405a490635 100644
> --- a/cmd/Kconfig
> +++ b/cmd/Kconfig
> @@ -1403,6 +1403,16 @@ 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 142e0ee222ca..48f2742168be 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..d836576cf6e0
> --- /dev/null
> +++ b/cmd/efidebug.c
> @@ -0,0 +1,461 @@
> +// 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>
> +
> +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 */
> +
> + /* 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) {
> + 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;
> +}
> +
> +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;
> +}
> +
> +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' : '-',
> + /* FORCE RECONNECT */
> + lo.attributes & 0x2 ? 'R' : '-',
> + /* HIDDEN */
> + lo.attributes & 0x8 ? '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);
> +}
> +
> +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);
> +}
> +
> +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;
> +}
> +
> +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;
> +}
> +
> +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;
> +}
> +
> +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,
> + "", ""),
> +};
> +
> +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, "", ""),
> +};
> +
> +/* Interpreter command to configure UEFI environment */
> +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> <device>[:<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"
> + " - show 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
> +);
>
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