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