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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Integrate UEFI variables to u-boot env interface
- *
- * Copyright (c) 2018 AKASHI Takahiro, Linaro Limited
- */
- #include <charset.h>
- #include <common.h>
- #include <command.h>
- #include <efi_loader.h>
- #include <env.h>
- #include <exports.h>
- #include <hexdump.h>
- #include <malloc.h>
- #include <linux/kernel.h>
- /*
- * From efi_variable.c,
- *
- * Mapping between UEFI variables and u-boot variables:
- *
- * efi_$guid_$varname = {attributes}(type)value
- */
- static const struct {
- u32 mask;
- char *text;
- } efi_var_attrs[] = {
- {EFI_VARIABLE_NON_VOLATILE, "NV"},
- {EFI_VARIABLE_BOOTSERVICE_ACCESS, "BS"},
- {EFI_VARIABLE_RUNTIME_ACCESS, "RT"},
- {EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS, "AW"},
- {EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS, "AT"},
- };
- /**
- * efi_dump_single_var() - show information about a UEFI variable
- *
- * @name: Name of the variable
- * @guid: Vendor GUID
- *
- * Show information encoded in one UEFI variable
- */
- static void efi_dump_single_var(u16 *name, efi_guid_t *guid)
- {
- u32 attributes;
- u8 *data;
- efi_uintn_t size;
- int count, i;
- efi_status_t ret;
- data = NULL;
- size = 0;
- ret = EFI_CALL(efi_get_variable(name, guid, &attributes, &size, data));
- if (ret == EFI_BUFFER_TOO_SMALL) {
- data = malloc(size);
- if (!data)
- goto out;
- ret = EFI_CALL(efi_get_variable(name, guid, &attributes, &size,
- data));
- }
- if (ret == EFI_NOT_FOUND) {
- printf("Error: \"%ls\" not defined\n", name);
- goto out;
- }
- if (ret != EFI_SUCCESS)
- goto out;
- printf("%ls:", name);
- for (count = 0, i = 0; i < ARRAY_SIZE(efi_var_attrs); i++)
- if (attributes & efi_var_attrs[i].mask) {
- if (count)
- putc('|');
- else
- putc(' ');
- count++;
- puts(efi_var_attrs[i].text);
- }
- printf(", DataSize = 0x%zx\n", size);
- print_hex_dump(" ", DUMP_PREFIX_OFFSET, 16, 1, data, size, true);
- out:
- free(data);
- }
- /**
- * efi_dump_vars() - show information about named UEFI variables
- *
- * @argc: Number of arguments (variables)
- * @argv: Argument (variable name) array
- * Return: CMD_RET_SUCCESS on success, or CMD_RET_RET_FAILURE
- *
- * Show information encoded in named UEFI variables
- */
- static int efi_dump_vars(int argc, char * const argv[])
- {
- u16 *var_name16, *p;
- efi_uintn_t buf_size, size;
- buf_size = 128;
- var_name16 = malloc(buf_size);
- if (!var_name16)
- return CMD_RET_FAILURE;
- for (; argc > 0; argc--, argv++) {
- size = (utf8_utf16_strlen(argv[0]) + 1) * sizeof(u16);
- if (buf_size < size) {
- buf_size = size;
- p = realloc(var_name16, buf_size);
- if (!p) {
- free(var_name16);
- return CMD_RET_FAILURE;
- }
- var_name16 = p;
- }
- p = var_name16;
- utf8_utf16_strcpy(&p, argv[0]);
- efi_dump_single_var(var_name16,
- (efi_guid_t *)&efi_global_variable_guid);
- }
- free(var_name16);
- return CMD_RET_SUCCESS;
- }
- /**
- * efi_dump_vars() - show information about all the UEFI variables
- *
- * Return: CMD_RET_SUCCESS on success, or CMD_RET_RET_FAILURE
- *
- * Show information encoded in all the UEFI variables
- */
- static int efi_dump_var_all(void)
- {
- u16 *var_name16, *p;
- efi_uintn_t buf_size, size;
- efi_guid_t guid;
- efi_status_t ret;
- 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;
- }
- efi_dump_single_var(var_name16, &guid);
- }
- free(var_name16);
- return CMD_RET_SUCCESS;
- }
- /**
- * do_env_print_efi() - show information about UEFI variables
- *
- * @cmdtp: Command table
- * @flag: Command flag
- * @argc: Number of arguments
- * @argv: Argument array
- * Return: CMD_RET_SUCCESS on success, or CMD_RET_RET_FAILURE
- *
- * This function is for "env print -e" or "printenv -e" command:
- * => env print -e [var [...]]
- * If one or more variable names are specified, show information
- * named UEFI variables, otherwise show all the UEFI variables.
- */
- int do_env_print_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
- {
- efi_status_t ret;
- /* Initialize EFI drivers */
- ret = efi_init_obj_list();
- if (ret != EFI_SUCCESS) {
- printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
- ret & ~EFI_ERROR_MASK);
- return CMD_RET_FAILURE;
- }
- if (argc > 1)
- /* show specified UEFI variables */
- return efi_dump_vars(--argc, ++argv);
- /* enumerate and show all UEFI variables */
- return efi_dump_var_all();
- }
- /**
- * append_value() - encode UEFI variable's value
- * @bufp: Buffer of encoded UEFI variable's value
- * @sizep: Size of buffer
- * @data: data to be encoded into the value
- * Return: 0 on success, -1 otherwise
- *
- * Interpret a given data string and append it to buffer.
- * Buffer will be realloc'ed if necessary.
- *
- * Currently supported formats are:
- * =0x0123...: Hexadecimal number
- * =H0123...: Hexadecimal-byte array
- * ="...", =S"..." or <string>:
- * String
- */
- static int append_value(char **bufp, size_t *sizep, char *data)
- {
- char *tmp_buf = NULL, *new_buf = NULL, *value;
- unsigned long len = 0;
- if (!strncmp(data, "=0x", 2)) { /* hexadecimal number */
- union {
- u8 u8;
- u16 u16;
- u32 u32;
- u64 u64;
- } tmp_data;
- unsigned long hex_value;
- void *hex_ptr;
- data += 3;
- len = strlen(data);
- if ((len & 0x1)) /* not multiple of two */
- return -1;
- len /= 2;
- if (len > 8)
- return -1;
- else if (len > 4)
- len = 8;
- else if (len > 2)
- len = 4;
- /* convert hex hexadecimal number */
- if (strict_strtoul(data, 16, &hex_value) < 0)
- return -1;
- tmp_buf = malloc(len);
- if (!tmp_buf)
- return -1;
- if (len == 1) {
- tmp_data.u8 = hex_value;
- hex_ptr = &tmp_data.u8;
- } else if (len == 2) {
- tmp_data.u16 = hex_value;
- hex_ptr = &tmp_data.u16;
- } else if (len == 4) {
- tmp_data.u32 = hex_value;
- hex_ptr = &tmp_data.u32;
- } else {
- tmp_data.u64 = hex_value;
- hex_ptr = &tmp_data.u64;
- }
- memcpy(tmp_buf, hex_ptr, len);
- value = tmp_buf;
- } else if (!strncmp(data, "=H", 2)) { /* hexadecimal-byte array */
- data += 2;
- len = strlen(data);
- if (len & 0x1) /* not multiple of two */
- return -1;
- len /= 2;
- tmp_buf = malloc(len);
- if (!tmp_buf)
- return -1;
- if (hex2bin((u8 *)tmp_buf, data, len) < 0) {
- printf("Error: illegal hexadecimal string\n");
- free(tmp_buf);
- return -1;
- }
- value = tmp_buf;
- } else { /* string */
- if (!strncmp(data, "=\"", 2) || !strncmp(data, "=S\"", 3)) {
- if (data[1] == '"')
- data += 2;
- else
- data += 3;
- value = data;
- len = strlen(data) - 1;
- if (data[len] != '"')
- return -1;
- } else {
- value = data;
- len = strlen(data);
- }
- }
- new_buf = realloc(*bufp, *sizep + len);
- if (!new_buf)
- goto out;
- memcpy(new_buf + *sizep, value, len);
- *bufp = new_buf;
- *sizep += len;
- out:
- free(tmp_buf);
- return 0;
- }
- /**
- * do_env_set_efi() - set UEFI variable
- *
- * @cmdtp: Command table
- * @flag: Command flag
- * @argc: Number of arguments
- * @argv: Argument array
- * Return: CMD_RET_SUCCESS on success, or CMD_RET_RET_FAILURE
- *
- * This function is for "env set -e" or "setenv -e" command:
- * => env set -e var [value ...]]
- * Encode values specified and set given UEFI variable.
- * If no value is specified, delete the variable.
- */
- int do_env_set_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
- {
- char *var_name, *value = NULL;
- efi_uintn_t size = 0;
- u16 *var_name16 = NULL, *p;
- size_t len;
- efi_guid_t guid;
- u32 attributes;
- efi_status_t ret;
- if (argc == 1)
- return CMD_RET_USAGE;
- /* Initialize EFI drivers */
- ret = efi_init_obj_list();
- if (ret != EFI_SUCCESS) {
- printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
- ret & ~EFI_ERROR_MASK);
- return CMD_RET_FAILURE;
- }
- attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS |
- EFI_VARIABLE_RUNTIME_ACCESS;
- if (!strcmp(argv[1], "-nv")) {
- attributes |= EFI_VARIABLE_NON_VOLATILE;
- argc--;
- argv++;
- if (argc == 1)
- return CMD_RET_SUCCESS;
- }
- var_name = argv[1];
- if (argc == 2) {
- /* delete */
- value = NULL;
- size = 0;
- } else { /* set */
- argc -= 2;
- argv += 2;
- for ( ; argc > 0; argc--, argv++)
- if (append_value(&value, &size, argv[0]) < 0) {
- printf("## Failed to process an argument, %s\n",
- argv[0]);
- ret = CMD_RET_FAILURE;
- goto out;
- }
- }
- len = utf8_utf16_strnlen(var_name, strlen(var_name));
- var_name16 = malloc((len + 1) * 2);
- if (!var_name16) {
- printf("## Out of memory\n");
- ret = CMD_RET_FAILURE;
- goto out;
- }
- p = var_name16;
- utf8_utf16_strncpy(&p, var_name, len + 1);
- guid = efi_global_variable_guid;
- ret = EFI_CALL(efi_set_variable(var_name16, &guid, attributes,
- size, value));
- if (ret == EFI_SUCCESS) {
- ret = CMD_RET_SUCCESS;
- } else {
- printf("## Failed to set EFI variable\n");
- ret = CMD_RET_FAILURE;
- }
- out:
- free(value);
- free(var_name16);
- return ret;
- }
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