doc: rockchip: Adapt Pine64 Rock64 board instructions

[thirdparty/u-boot.git] / cmd / efidebug.c

// 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 <hexdump.h>
#include <malloc.h>
#include <search.h>
#include <linux/ctype.h>

#define BS systab.boottime
#define RT systab.runtime

/**
 * efi_get_device_handle_info() - get information of UEFI device
 *
 * @handle:             Handle of UEFI device
 * @dev_path_text:      Pointer to text of device path
 * Return:              0 on success, -1 on failure
 *
 * Currently return a formatted text of device path.
 */
static int efi_get_device_handle_info(efi_handle_t handle, u16 **dev_path_text)
{
        struct efi_device_path *dp;
        efi_status_t ret;

        ret = EFI_CALL(BS->open_protocol(handle, &efi_guid_device_path,
                                         (void **)&dp, NULL /* FIXME */, NULL,
                                         EFI_OPEN_PROTOCOL_GET_PROTOCOL));
        if (ret == EFI_SUCCESS) {
                *dev_path_text = efi_dp_str(dp);
                return 0;
        } else {
                return -1;
        }
}

#define EFI_HANDLE_WIDTH ((int)sizeof(efi_handle_t) * 2)

static const char spc[] = "                ";
static const char sep[] = "================";

/**
 * do_efi_show_devices() - show UEFI devices
 *
 * @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 "devices" sub-command.
 * Show all UEFI devices and their information.
 */
static int do_efi_show_devices(cmd_tbl_t *cmdtp, int flag,
                               int argc, char * const argv[])
{
        efi_handle_t *handles;
        efi_uintn_t num, i;
        u16 *dev_path_text;
        efi_status_t ret;

        ret = EFI_CALL(BS->locate_handle_buffer(ALL_HANDLES, NULL, NULL,
                                                &num, &handles));
        if (ret != EFI_SUCCESS)
                return CMD_RET_FAILURE;

        if (!num)
                return CMD_RET_SUCCESS;

        printf("Device%.*s Device Path\n", EFI_HANDLE_WIDTH - 6, spc);
        printf("%.*s ====================\n", EFI_HANDLE_WIDTH, sep);
        for (i = 0; i < num; i++) {
                if (!efi_get_device_handle_info(handles[i], &dev_path_text)) {
                        printf("%p %ls\n", handles[i], dev_path_text);
                        efi_free_pool(dev_path_text);
                }
        }

        EFI_CALL(BS->free_pool(handles));

        return CMD_RET_SUCCESS;
}

/**
 * efi_get_driver_handle_info() - get information of UEFI driver
 *
 * @handle:             Handle of UEFI device
 * @driver_name:        Driver name
 * @image_path:         Pointer to text of device path
 * Return:              0 on success, -1 on failure
 *
 * Currently return no useful information as all UEFI drivers are
 * built-in..
 */
static int efi_get_driver_handle_info(efi_handle_t handle, u16 **driver_name,
                                      u16 **image_path)
{
        struct efi_handler *handler;
        struct efi_loaded_image *image;
        efi_status_t ret;

        /*
         * driver name
         * TODO: support EFI_COMPONENT_NAME2_PROTOCOL
         */
        *driver_name = NULL;

        /* image name */
        ret = efi_search_protocol(handle, &efi_guid_loaded_image, &handler);
        if (ret != EFI_SUCCESS) {
                *image_path = NULL;
                return 0;
        }

        image = handler->protocol_interface;
        *image_path = efi_dp_str(image->file_path);

        return 0;
}

/**
 * do_efi_show_drivers() - show UEFI drivers
 *
 * @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 "drivers" sub-command.
 * Show all UEFI drivers and their information.
 */
static int do_efi_show_drivers(cmd_tbl_t *cmdtp, int flag,
                               int argc, char * const argv[])
{
        efi_handle_t *handles;
        efi_uintn_t num, i;
        u16 *driver_name, *image_path_text;
        efi_status_t ret;

        ret = EFI_CALL(BS->locate_handle_buffer(
                                BY_PROTOCOL, &efi_guid_driver_binding_protocol,
                                NULL, &num, &handles));
        if (ret != EFI_SUCCESS)
                return CMD_RET_FAILURE;

        if (!num)
                return CMD_RET_SUCCESS;

        printf("Driver%.*s Name                 Image Path\n",
               EFI_HANDLE_WIDTH - 6, spc);
        printf("%.*s ==================== ====================\n",
               EFI_HANDLE_WIDTH, sep);
        for (i = 0; i < num; i++) {
                if (!efi_get_driver_handle_info(handles[i], &driver_name,
                                                &image_path_text)) {
                        if (image_path_text)
                                printf("%p %-20ls %ls\n", handles[i],
                                       driver_name, image_path_text);
                        else
                                printf("%p %-20ls <built-in>\n",
                                       handles[i], driver_name);
                        EFI_CALL(BS->free_pool(driver_name));
                        EFI_CALL(BS->free_pool(image_path_text));
                }
        }

        EFI_CALL(BS->free_pool(handles));

        return CMD_RET_SUCCESS;
}

static const struct {
        const char *text;
        const efi_guid_t guid;
} guid_list[] = {
        {
                "Device Path",
                EFI_DEVICE_PATH_PROTOCOL_GUID,
        },
        {
                "Device Path To Text",
                EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID,
        },
        {
                "Device Path Utilities",
                EFI_DEVICE_PATH_UTILITIES_PROTOCOL_GUID,
        },
        {
                "Unicode Collation 2",
                EFI_UNICODE_COLLATION_PROTOCOL2_GUID,
        },
        {
                "Driver Binding",
                EFI_DRIVER_BINDING_PROTOCOL_GUID,
        },
        {
                "Simple Text Input",
                EFI_SIMPLE_TEXT_INPUT_PROTOCOL_GUID,
        },
        {
                "Simple Text Input Ex",
                EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL_GUID,
        },
        {
                "Simple Text Output",
                EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_GUID,
        },
        {
                "Block IO",
                EFI_BLOCK_IO_PROTOCOL_GUID,
        },
        {
                "Simple File System",
                EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID,
        },
        {
                "Loaded Image",
                EFI_LOADED_IMAGE_PROTOCOL_GUID,
        },
        {
                "Graphics Output",
                EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID,
        },
        {
                "HII String",
                EFI_HII_STRING_PROTOCOL_GUID,
        },
        {
                "HII Database",
                EFI_HII_DATABASE_PROTOCOL_GUID,
        },
        {
                "HII Config Routing",
                EFI_HII_CONFIG_ROUTING_PROTOCOL_GUID,
        },
        {
                "Simple Network",
                EFI_SIMPLE_NETWORK_PROTOCOL_GUID,
        },
        {
                "PXE Base Code",
                EFI_PXE_BASE_CODE_PROTOCOL_GUID,
        },
};

/**
 * get_guid_text - get string of protocol guid
 * @guid:       Protocol guid
 * Return:      String
 *
 * Return string for display to represent the protocol.
 */
static const char *get_guid_text(const efi_guid_t *guid)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(guid_list); i++)
                if (!guidcmp(&guid_list[i].guid, guid))
                        break;

        if (i != ARRAY_SIZE(guid_list))
                return guid_list[i].text;
        else
                return NULL;
}

/**
 * do_efi_show_handles() - show UEFI handles
 *
 * @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 "dh" sub-command.
 * Show all UEFI handles and their information, currently all protocols
 * added to handle.
 */
static int do_efi_show_handles(cmd_tbl_t *cmdtp, int flag,
                               int argc, char * const argv[])
{
        efi_handle_t *handles;
        efi_guid_t **guid;
        efi_uintn_t num, count, i, j;
        const char *guid_text;
        efi_status_t ret;

        ret = EFI_CALL(BS->locate_handle_buffer(ALL_HANDLES, NULL, NULL,
                                                &num, &handles));
        if (ret != EFI_SUCCESS)
                return CMD_RET_FAILURE;

        if (!num)
                return CMD_RET_SUCCESS;

        printf("Handle%.*s Protocols\n", EFI_HANDLE_WIDTH - 6, spc);
        printf("%.*s ====================\n", EFI_HANDLE_WIDTH, sep);
        for (i = 0; i < num; i++) {
                printf("%p", handles[i]);
                ret = EFI_CALL(BS->protocols_per_handle(handles[i], &guid,
                                                        &count));
                if (ret || !count) {
                        putc('\n');
                        continue;
                }

                for (j = 0; j < count; j++) {
                        if (j)
                                printf(", ");
                        else
                                putc(' ');

                        guid_text = get_guid_text(guid[j]);
                        if (guid_text)
                                puts(guid_text);
                        else
                                printf("%pUl", guid[j]);
                }
                putc('\n');
        }

        EFI_CALL(BS->free_pool(handles));

        return CMD_RET_SUCCESS;
}

/**
 * do_efi_show_images() - show UEFI images
 *
 * @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 "images" sub-command.
 * Show all UEFI loaded images and their information.
 */
static int do_efi_show_images(cmd_tbl_t *cmdtp, int flag,
                              int argc, char * const argv[])
{
        efi_print_image_infos(NULL);

        return CMD_RET_SUCCESS;
}

static const char * const efi_mem_type_string[] = {
        [EFI_RESERVED_MEMORY_TYPE] = "RESERVED",
        [EFI_LOADER_CODE] = "LOADER CODE",
        [EFI_LOADER_DATA] = "LOADER DATA",
        [EFI_BOOT_SERVICES_CODE] = "BOOT CODE",
        [EFI_BOOT_SERVICES_DATA] = "BOOT DATA",
        [EFI_RUNTIME_SERVICES_CODE] = "RUNTIME CODE",
        [EFI_RUNTIME_SERVICES_DATA] = "RUNTIME DATA",
        [EFI_CONVENTIONAL_MEMORY] = "CONVENTIONAL",
        [EFI_UNUSABLE_MEMORY] = "UNUSABLE MEM",
        [EFI_ACPI_RECLAIM_MEMORY] = "ACPI RECLAIM MEM",
        [EFI_ACPI_MEMORY_NVS] = "ACPI NVS",
        [EFI_MMAP_IO] = "IO",
        [EFI_MMAP_IO_PORT] = "IO PORT",
        [EFI_PAL_CODE] = "PAL",
};

static const struct efi_mem_attrs {
        const u64 bit;
        const char *text;
} efi_mem_attrs[] = {
        {EFI_MEMORY_UC, "UC"},
        {EFI_MEMORY_UC, "UC"},
        {EFI_MEMORY_WC, "WC"},
        {EFI_MEMORY_WT, "WT"},
        {EFI_MEMORY_WB, "WB"},
        {EFI_MEMORY_UCE, "UCE"},
        {EFI_MEMORY_WP, "WP"},
        {EFI_MEMORY_RP, "RP"},
        {EFI_MEMORY_XP, "WP"},
        {EFI_MEMORY_NV, "NV"},
        {EFI_MEMORY_MORE_RELIABLE, "REL"},
        {EFI_MEMORY_RO, "RO"},
        {EFI_MEMORY_RUNTIME, "RT"},
};

/**
 * print_memory_attributes() - print memory map attributes
 *
 * @attributes: Attribute value
 *
 * Print memory map attributes
 */
static void print_memory_attributes(u64 attributes)
{
        int sep, i;

        for (sep = 0, i = 0; i < ARRAY_SIZE(efi_mem_attrs); i++)
                if (attributes & efi_mem_attrs[i].bit) {
                        if (sep) {
                                putc('|');
                        } else {
                                putc(' ');
                                sep = 1;
                        }
                        puts(efi_mem_attrs[i].text);
                }
}

#define EFI_PHYS_ADDR_WIDTH (int)(sizeof(efi_physical_addr_t) * 2)

/**
 * do_efi_show_memmap() - show UEFI memory map
 *
 * @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 "memmap" sub-command.
 * Show UEFI memory map.
 */
static int do_efi_show_memmap(cmd_tbl_t *cmdtp, int flag,
                              int argc, char * const argv[])
{
        struct efi_mem_desc *memmap = NULL, *map;
        efi_uintn_t map_size = 0;
        const char *type;
        int i;
        efi_status_t ret;

        ret = EFI_CALL(BS->get_memory_map(&map_size, memmap, NULL, NULL, NULL));
        if (ret == EFI_BUFFER_TOO_SMALL) {
                map_size += sizeof(struct efi_mem_desc); /* for my own */
                ret = EFI_CALL(BS->allocate_pool(EFI_LOADER_DATA,
                                                 map_size, (void *)&memmap));
                if (ret != EFI_SUCCESS)
                        return CMD_RET_FAILURE;
                ret = EFI_CALL(BS->get_memory_map(&map_size, memmap,
                                                  NULL, NULL, NULL));
        }
        if (ret != EFI_SUCCESS) {
                EFI_CALL(BS->free_pool(memmap));
                return CMD_RET_FAILURE;
        }

        printf("Type             Start%.*s End%.*s Attributes\n",
               EFI_PHYS_ADDR_WIDTH - 5, spc, EFI_PHYS_ADDR_WIDTH - 3, spc);
        printf("================ %.*s %.*s ==========\n",
               EFI_PHYS_ADDR_WIDTH, sep, EFI_PHYS_ADDR_WIDTH, sep);
        for (i = 0, map = memmap; i < map_size / sizeof(*map); map++, i++) {
                if (map->type < EFI_MAX_MEMORY_TYPE)
                        type = efi_mem_type_string[map->type];
                else
                        type = "(unknown)";

                printf("%-16s %.*llx-%.*llx", type,
                       EFI_PHYS_ADDR_WIDTH,
                       map->physical_start,
                       EFI_PHYS_ADDR_WIDTH,
                       map->physical_start + map->num_pages * EFI_PAGE_SIZE);

                print_memory_attributes(map->attribute);
                putc('\n');
        }

        EFI_CALL(BS->free_pool(memmap));

        return CMD_RET_SUCCESS;
}

/**
 * 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.
 *
 *     efidebug 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;
        efi_status_t ret;
        int r = CMD_RET_SUCCESS;

        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_USAGE;

        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]);
                r = 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 */
        if (argc < 6)
                lo.optional_data = NULL;
        else
                lo.optional_data = (const u8 *)argv[6];

        size = efi_serialize_load_option(&lo, (u8 **)&data);
        if (!size) {
                r = CMD_RET_FAILURE;
                goto out;
        }

        ret = EFI_CALL(RT->set_variable(var_name16, &guid,
                                        EFI_VARIABLE_NON_VOLATILE |
                                        EFI_VARIABLE_BOOTSERVICE_ACCESS |
                                        EFI_VARIABLE_RUNTIME_ACCESS,
                                        size, data));
        if (ret != EFI_SUCCESS) {
                printf("Cannot set %ls\n", var_name16);
                r = CMD_RET_FAILURE;
        }
out:
        free(data);
        efi_free_pool(device_path);
        efi_free_pool(file_path);
        free(lo.label);

        return r;
}

/**
 * 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.
 *
 *     efidebug 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
 * @size:       size of the boot option
 *
 * Decode the value of UEFI load option variable and print information.
 */
static void show_efi_boot_opt_data(int id, void *data, size_t size)
{
        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("  attributes: %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("  label: %s\n", label);

        dp_str = efi_dp_str(lo.file_path);
        printf("  file_path: %ls\n", dp_str);
        efi_free_pool(dp_str);

        printf("  data:\n");
        print_hex_dump("    ", DUMP_PREFIX_OFFSET, 16, 1,
                       lo.optional_data, size + (u8 *)data -
                       (u8 *)lo.optional_data, true);
        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, size);
        else if (ret == EFI_NOT_FOUND)
                printf("Boot%04X: not found\n", id);

        free(data);
}

static int u16_tohex(u16 c)
{
        if (c >= '0' && c <= '9')
                return c - '0';
        if (c >= 'A' && c <= 'F')
                return c - 'A' + 10;

        /* not hexadecimal */
        return -1;
}

/**
 * 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[])
{
        u16 *var_name16, *p;
        efi_uintn_t buf_size, size;
        efi_guid_t guid;
        int id, i, digit;
        efi_status_t ret;

        if (argc > 1)
                return CMD_RET_USAGE;

        buf_size = 128;
        var_name16 = malloc(buf_size);
        if (!var_name16)
                return CMD_RET_FAILURE;

        var_name16[0] = 0;
        for (;;) {
                size = buf_size;
                ret = EFI_CALL(efi_get_next_variable_name(&size, var_name16,
                                                          &guid));
                if (ret == EFI_NOT_FOUND)
                        break;
                if (ret == EFI_BUFFER_TOO_SMALL) {
                        buf_size = size;
                        p = realloc(var_name16, buf_size);
                        if (!p) {
                                free(var_name16);
                                return CMD_RET_FAILURE;
                        }
                        var_name16 = p;
                        ret = EFI_CALL(efi_get_next_variable_name(&size,
                                                                  var_name16,
                                                                  &guid));
                }
                if (ret != EFI_SUCCESS) {
                        free(var_name16);
                        return CMD_RET_FAILURE;
                }

                if (memcmp(var_name16, L"Boot", 8))
                        continue;

                for (id = 0, i = 0; i < 4; i++) {
                        digit = u16_tohex(var_name16[4 + i]);
                        if (digit < 0)
                                break;
                        id = (id << 4) + digit;
                }
                if (i == 4 && !var_name16[8])
                        show_efi_boot_opt(id);
        }

        free(var_name16);

        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.
 *
 *     efidebug 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;
        int r = CMD_RET_SUCCESS;

        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]);
                r = CMD_RET_FAILURE;
                goto out;
        }

        guid = efi_global_variable_guid;
        size = sizeof(u16);
        ret = EFI_CALL(RT->set_variable(L"BootNext", &guid,
                                        EFI_VARIABLE_NON_VOLATILE |
                                        EFI_VARIABLE_BOOTSERVICE_ACCESS |
                                        EFI_VARIABLE_RUNTIME_ACCESS,
                                        size, &bootnext));
        if (ret != EFI_SUCCESS) {
                printf("Cannot set BootNext\n");
                r = CMD_RET_FAILURE;
        }
out:
        return r;
}

/**
 * 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.
 *
 *     efidebug 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;
        int r = CMD_RET_SUCCESS;

        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]);
                        r = 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_NON_VOLATILE |
                                        EFI_VARIABLE_BOOTSERVICE_ACCESS |
                                        EFI_VARIABLE_RUNTIME_ACCESS,
                                        size, bootorder));
        if (ret != EFI_SUCCESS) {
                printf("Cannot set BootOrder\n");
                r = CMD_RET_FAILURE;
        }
out:
        free(bootorder);

        return r;
}

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, "", ""),
        U_BOOT_CMD_MKENT(devices, CONFIG_SYS_MAXARGS, 1, do_efi_show_devices,
                         "", ""),
        U_BOOT_CMD_MKENT(drivers, CONFIG_SYS_MAXARGS, 1, do_efi_show_drivers,
                         "", ""),
        U_BOOT_CMD_MKENT(dh, CONFIG_SYS_MAXARGS, 1, do_efi_show_handles,
                         "", ""),
        U_BOOT_CMD_MKENT(images, CONFIG_SYS_MAXARGS, 1, do_efi_show_images,
                         "", ""),
        U_BOOT_CMD_MKENT(memmap, CONFIG_SYS_MAXARGS, 1, do_efi_show_memmap,
                         "", ""),
};

/**
 * 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"
        "efidebug devices\n"
        "  - show uefi devices\n"
        "efidebug drivers\n"
        "  - show uefi drivers\n"
        "efidebug dh\n"
        "  - show uefi handles\n"
        "efidebug images\n"
        "  - show loaded images\n"
        "efidebug memmap\n"
        "  - show uefi memory map\n";
#endif

U_BOOT_CMD(
        efidebug, 10, 0, do_efidebug,
        "Configure UEFI environment",
        efidebug_help_text
);