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![Wolfgang Denk](/assets/img/avatar_default.png)
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
758 lines
19 KiB
C
758 lines
19 KiB
C
/*
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* Copyright (c) 2013 The Chromium OS Authors.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <malloc.h>
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#include <tpm.h>
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#include <asm/unaligned.h>
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#include <linux/string.h>
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/* Useful constants */
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enum {
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DIGEST_LENGTH = 20,
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/* max lengths, valid for RSA keys <= 2048 bits */
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TPM_PUBKEY_MAX_LENGTH = 288,
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};
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/**
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* Print a byte string in hexdecimal format, 16-bytes per line.
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*
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* @param data byte string to be printed
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* @param count number of bytes to be printed
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*/
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static void print_byte_string(uint8_t *data, size_t count)
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{
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int i, print_newline = 0;
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for (i = 0; i < count; i++) {
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printf(" %02x", data[i]);
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print_newline = (i % 16 == 15);
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if (print_newline)
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putc('\n');
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}
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/* Avoid duplicated newline at the end */
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if (!print_newline)
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putc('\n');
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}
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/**
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* Convert a text string of hexdecimal values into a byte string.
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*
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* @param bytes text string of hexdecimal values with no space
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* between them
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* @param data output buffer for byte string. The caller has to make
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* sure it is large enough for storing the output. If
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* NULL is passed, a large enough buffer will be allocated,
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* and the caller must free it.
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* @param count_ptr output variable for the length of byte string
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* @return pointer to output buffer
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*/
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static void *parse_byte_string(char *bytes, uint8_t *data, size_t *count_ptr)
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{
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char byte[3];
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size_t count, length;
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int i;
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length = strlen(bytes);
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count = length / 2;
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if (!data)
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data = malloc(count);
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if (!data)
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return NULL;
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byte[2] = '\0';
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for (i = 0; i < length; i += 2) {
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byte[0] = bytes[i];
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byte[1] = bytes[i + 1];
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data[i / 2] = (uint8_t)simple_strtoul(byte, NULL, 16);
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}
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if (count_ptr)
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*count_ptr = count;
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return data;
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}
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/**
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* Convert TPM command return code to U-Boot command error codes.
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*
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* @param return_code TPM command return code
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* @return value of enum command_ret_t
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*/
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static int convert_return_code(uint32_t return_code)
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{
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if (return_code)
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return CMD_RET_FAILURE;
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else
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return CMD_RET_SUCCESS;
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}
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/**
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* Return number of values defined by a type string.
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*
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* @param type_str type string
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* @return number of values of type string
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*/
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static int type_string_get_num_values(const char *type_str)
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{
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return strlen(type_str);
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}
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/**
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* Return total size of values defined by a type string.
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*
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* @param type_str type string
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* @return total size of values of type string, or 0 if type string
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* contains illegal type character.
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*/
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static size_t type_string_get_space_size(const char *type_str)
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{
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size_t size;
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for (size = 0; *type_str; type_str++) {
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switch (*type_str) {
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case 'b':
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size += 1;
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break;
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case 'w':
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size += 2;
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break;
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case 'd':
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size += 4;
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break;
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default:
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return 0;
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}
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}
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return size;
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}
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/**
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* Allocate a buffer large enough to hold values defined by a type
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* string. The caller has to free the buffer.
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*
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* @param type_str type string
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* @param count pointer for storing size of buffer
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* @return pointer to buffer or NULL on error
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*/
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static void *type_string_alloc(const char *type_str, uint32_t *count)
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{
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void *data;
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size_t size;
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size = type_string_get_space_size(type_str);
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if (!size)
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return NULL;
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data = malloc(size);
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if (data)
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*count = size;
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return data;
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}
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/**
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* Pack values defined by a type string into a buffer. The buffer must have
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* large enough space.
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*
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* @param type_str type string
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* @param values text strings of values to be packed
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* @param data output buffer of values
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* @return 0 on success, non-0 on error
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*/
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static int type_string_pack(const char *type_str, char * const values[],
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uint8_t *data)
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{
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size_t offset;
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uint32_t value;
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for (offset = 0; *type_str; type_str++, values++) {
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value = simple_strtoul(values[0], NULL, 0);
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switch (*type_str) {
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case 'b':
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data[offset] = value;
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offset += 1;
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break;
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case 'w':
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put_unaligned_be16(value, data + offset);
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offset += 2;
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break;
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case 'd':
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put_unaligned_be32(value, data + offset);
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offset += 4;
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break;
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default:
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return -1;
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}
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}
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return 0;
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}
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/**
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* Read values defined by a type string from a buffer, and write these values
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* to environment variables.
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*
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* @param type_str type string
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* @param data input buffer of values
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* @param vars names of environment variables
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* @return 0 on success, non-0 on error
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*/
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static int type_string_write_vars(const char *type_str, uint8_t *data,
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char * const vars[])
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{
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size_t offset;
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uint32_t value;
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for (offset = 0; *type_str; type_str++, vars++) {
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switch (*type_str) {
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case 'b':
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value = data[offset];
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offset += 1;
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break;
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case 'w':
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value = get_unaligned_be16(data + offset);
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offset += 2;
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break;
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case 'd':
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value = get_unaligned_be32(data + offset);
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offset += 4;
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break;
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default:
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return -1;
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}
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if (setenv_ulong(*vars, value))
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return -1;
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}
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return 0;
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}
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static int do_tpm_startup(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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enum tpm_startup_type mode;
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if (argc != 2)
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return CMD_RET_USAGE;
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if (!strcasecmp("TPM_ST_CLEAR", argv[1])) {
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mode = TPM_ST_CLEAR;
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} else if (!strcasecmp("TPM_ST_STATE", argv[1])) {
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mode = TPM_ST_STATE;
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} else if (!strcasecmp("TPM_ST_DEACTIVATED", argv[1])) {
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mode = TPM_ST_DEACTIVATED;
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} else {
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printf("Couldn't recognize mode string: %s\n", argv[1]);
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return CMD_RET_FAILURE;
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}
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return convert_return_code(tpm_startup(mode));
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}
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static int do_tpm_nv_define_space(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t index, perm, size;
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if (argc != 4)
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return CMD_RET_USAGE;
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index = simple_strtoul(argv[1], NULL, 0);
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perm = simple_strtoul(argv[2], NULL, 0);
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size = simple_strtoul(argv[3], NULL, 0);
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return convert_return_code(tpm_nv_define_space(index, perm, size));
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}
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static int do_tpm_nv_read_value(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t index, count, rc;
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void *data;
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if (argc != 4)
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return CMD_RET_USAGE;
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index = simple_strtoul(argv[1], NULL, 0);
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data = (void *)simple_strtoul(argv[2], NULL, 0);
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count = simple_strtoul(argv[3], NULL, 0);
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rc = tpm_nv_read_value(index, data, count);
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if (!rc) {
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puts("area content:\n");
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print_byte_string(data, count);
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}
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return convert_return_code(rc);
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}
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static int do_tpm_nv_write_value(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t index, rc;
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size_t count;
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void *data;
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if (argc != 3)
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return CMD_RET_USAGE;
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index = simple_strtoul(argv[1], NULL, 0);
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data = parse_byte_string(argv[2], NULL, &count);
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if (!data) {
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printf("Couldn't parse byte string %s\n", argv[2]);
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return CMD_RET_FAILURE;
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}
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rc = tpm_nv_write_value(index, data, count);
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free(data);
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return convert_return_code(rc);
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}
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static int do_tpm_extend(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t index, rc;
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uint8_t in_digest[20], out_digest[20];
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if (argc != 3)
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return CMD_RET_USAGE;
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index = simple_strtoul(argv[1], NULL, 0);
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if (!parse_byte_string(argv[2], in_digest, NULL)) {
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printf("Couldn't parse byte string %s\n", argv[2]);
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return CMD_RET_FAILURE;
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}
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rc = tpm_extend(index, in_digest, out_digest);
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if (!rc) {
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puts("PCR value after execution of the command:\n");
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print_byte_string(out_digest, sizeof(out_digest));
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}
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return convert_return_code(rc);
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}
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static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t index, count, rc;
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void *data;
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if (argc != 4)
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return CMD_RET_USAGE;
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index = simple_strtoul(argv[1], NULL, 0);
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data = (void *)simple_strtoul(argv[2], NULL, 0);
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count = simple_strtoul(argv[3], NULL, 0);
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rc = tpm_pcr_read(index, data, count);
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if (!rc) {
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puts("Named PCR content:\n");
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print_byte_string(data, count);
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}
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return convert_return_code(rc);
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}
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static int do_tpm_tsc_physical_presence(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint16_t presence;
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if (argc != 2)
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return CMD_RET_USAGE;
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presence = (uint16_t)simple_strtoul(argv[1], NULL, 0);
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return convert_return_code(tpm_tsc_physical_presence(presence));
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}
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static int do_tpm_read_pubek(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t count, rc;
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void *data;
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if (argc != 3)
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return CMD_RET_USAGE;
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data = (void *)simple_strtoul(argv[1], NULL, 0);
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count = simple_strtoul(argv[2], NULL, 0);
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rc = tpm_read_pubek(data, count);
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if (!rc) {
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puts("pubek value:\n");
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print_byte_string(data, count);
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}
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return convert_return_code(rc);
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}
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static int do_tpm_physical_set_deactivated(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint8_t state;
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if (argc != 2)
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return CMD_RET_USAGE;
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state = (uint8_t)simple_strtoul(argv[1], NULL, 0);
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return convert_return_code(tpm_physical_set_deactivated(state));
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}
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static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t cap_area, sub_cap, rc;
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void *cap;
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size_t count;
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if (argc != 5)
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return CMD_RET_USAGE;
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cap_area = simple_strtoul(argv[1], NULL, 0);
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sub_cap = simple_strtoul(argv[2], NULL, 0);
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cap = (void *)simple_strtoul(argv[3], NULL, 0);
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count = simple_strtoul(argv[4], NULL, 0);
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rc = tpm_get_capability(cap_area, sub_cap, cap, count);
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if (!rc) {
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puts("capability information:\n");
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print_byte_string(cap, count);
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}
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return convert_return_code(rc);
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}
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#define TPM_COMMAND_NO_ARG(cmd) \
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static int do_##cmd(cmd_tbl_t *cmdtp, int flag, \
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int argc, char * const argv[]) \
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{ \
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if (argc != 1) \
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return CMD_RET_USAGE; \
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return convert_return_code(cmd()); \
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}
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TPM_COMMAND_NO_ARG(tpm_init)
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TPM_COMMAND_NO_ARG(tpm_self_test_full)
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TPM_COMMAND_NO_ARG(tpm_continue_self_test)
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TPM_COMMAND_NO_ARG(tpm_force_clear)
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TPM_COMMAND_NO_ARG(tpm_physical_enable)
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TPM_COMMAND_NO_ARG(tpm_physical_disable)
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static int do_tpm_raw_transfer(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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void *command;
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uint8_t response[1024];
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size_t count, response_length = sizeof(response);
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uint32_t rc;
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command = parse_byte_string(argv[1], NULL, &count);
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if (!command) {
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printf("Couldn't parse byte string %s\n", argv[1]);
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return CMD_RET_FAILURE;
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}
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rc = tis_sendrecv(command, count, response, &response_length);
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free(command);
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if (!rc) {
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puts("tpm response:\n");
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print_byte_string(response, response_length);
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}
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return convert_return_code(rc);
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}
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static int do_tpm_nv_define(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t index, perm, size;
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if (argc != 4)
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return CMD_RET_USAGE;
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size = type_string_get_space_size(argv[1]);
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if (!size) {
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printf("Couldn't parse arguments\n");
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return CMD_RET_USAGE;
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}
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index = simple_strtoul(argv[2], NULL, 0);
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perm = simple_strtoul(argv[3], NULL, 0);
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return convert_return_code(tpm_nv_define_space(index, perm, size));
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}
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static int do_tpm_nv_read(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t index, count, err;
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void *data;
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if (argc < 3)
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return CMD_RET_USAGE;
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if (argc != 3 + type_string_get_num_values(argv[1]))
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return CMD_RET_USAGE;
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index = simple_strtoul(argv[2], NULL, 0);
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data = type_string_alloc(argv[1], &count);
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if (!data) {
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printf("Couldn't parse arguments\n");
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return CMD_RET_USAGE;
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}
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err = tpm_nv_read_value(index, data, count);
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if (!err) {
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if (type_string_write_vars(argv[1], data, argv + 3)) {
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printf("Couldn't write to variables\n");
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err = ~0;
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}
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}
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free(data);
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return convert_return_code(err);
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}
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static int do_tpm_nv_write(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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uint32_t index, count, err;
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void *data;
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if (argc < 3)
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return CMD_RET_USAGE;
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if (argc != 3 + type_string_get_num_values(argv[1]))
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return CMD_RET_USAGE;
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index = simple_strtoul(argv[2], NULL, 0);
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data = type_string_alloc(argv[1], &count);
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if (!data) {
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printf("Couldn't parse arguments\n");
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return CMD_RET_USAGE;
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}
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if (type_string_pack(argv[1], argv + 3, data)) {
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printf("Couldn't parse arguments\n");
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free(data);
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return CMD_RET_USAGE;
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}
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err = tpm_nv_write_value(index, data, count);
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free(data);
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return convert_return_code(err);
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}
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#ifdef CONFIG_TPM_AUTH_SESSIONS
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|
|
static int do_tpm_oiap(cmd_tbl_t *cmdtp, int flag,
|
|
int argc, char * const argv[])
|
|
{
|
|
uint32_t auth_handle, err;
|
|
|
|
err = tpm_oiap(&auth_handle);
|
|
|
|
return convert_return_code(err);
|
|
}
|
|
|
|
static int do_tpm_load_key2_oiap(cmd_tbl_t *cmdtp, int flag,
|
|
int argc, char * const argv[])
|
|
{
|
|
uint32_t parent_handle, key_len, key_handle, err;
|
|
uint8_t usage_auth[DIGEST_LENGTH];
|
|
void *key;
|
|
|
|
if (argc < 5)
|
|
return CMD_RET_USAGE;
|
|
|
|
parent_handle = simple_strtoul(argv[1], NULL, 0);
|
|
key = (void *)simple_strtoul(argv[2], NULL, 0);
|
|
key_len = simple_strtoul(argv[3], NULL, 0);
|
|
if (strlen(argv[4]) != 2 * DIGEST_LENGTH)
|
|
return CMD_RET_FAILURE;
|
|
parse_byte_string(argv[4], usage_auth, NULL);
|
|
|
|
err = tpm_load_key2_oiap(parent_handle, key, key_len, usage_auth,
|
|
&key_handle);
|
|
if (!err)
|
|
printf("Key handle is 0x%x\n", key_handle);
|
|
|
|
return convert_return_code(err);
|
|
}
|
|
|
|
static int do_tpm_get_pub_key_oiap(cmd_tbl_t *cmdtp, int flag,
|
|
int argc, char * const argv[])
|
|
{
|
|
uint32_t key_handle, err;
|
|
uint8_t usage_auth[DIGEST_LENGTH];
|
|
uint8_t pub_key_buffer[TPM_PUBKEY_MAX_LENGTH];
|
|
size_t pub_key_len = sizeof(pub_key_buffer);
|
|
|
|
if (argc < 3)
|
|
return CMD_RET_USAGE;
|
|
|
|
key_handle = simple_strtoul(argv[1], NULL, 0);
|
|
if (strlen(argv[2]) != 2 * DIGEST_LENGTH)
|
|
return CMD_RET_FAILURE;
|
|
parse_byte_string(argv[2], usage_auth, NULL);
|
|
|
|
err = tpm_get_pub_key_oiap(key_handle, usage_auth,
|
|
pub_key_buffer, &pub_key_len);
|
|
if (!err) {
|
|
printf("dump of received pub key structure:\n");
|
|
print_byte_string(pub_key_buffer, pub_key_len);
|
|
}
|
|
return convert_return_code(err);
|
|
}
|
|
|
|
TPM_COMMAND_NO_ARG(tpm_end_oiap)
|
|
|
|
#endif /* CONFIG_TPM_AUTH_SESSIONS */
|
|
|
|
#define MAKE_TPM_CMD_ENTRY(cmd) \
|
|
U_BOOT_CMD_MKENT(cmd, 0, 1, do_tpm_ ## cmd, "", "")
|
|
|
|
static cmd_tbl_t tpm_commands[] = {
|
|
U_BOOT_CMD_MKENT(init, 0, 1,
|
|
do_tpm_init, "", ""),
|
|
U_BOOT_CMD_MKENT(startup, 0, 1,
|
|
do_tpm_startup, "", ""),
|
|
U_BOOT_CMD_MKENT(self_test_full, 0, 1,
|
|
do_tpm_self_test_full, "", ""),
|
|
U_BOOT_CMD_MKENT(continue_self_test, 0, 1,
|
|
do_tpm_continue_self_test, "", ""),
|
|
U_BOOT_CMD_MKENT(force_clear, 0, 1,
|
|
do_tpm_force_clear, "", ""),
|
|
U_BOOT_CMD_MKENT(physical_enable, 0, 1,
|
|
do_tpm_physical_enable, "", ""),
|
|
U_BOOT_CMD_MKENT(physical_disable, 0, 1,
|
|
do_tpm_physical_disable, "", ""),
|
|
U_BOOT_CMD_MKENT(nv_define_space, 0, 1,
|
|
do_tpm_nv_define_space, "", ""),
|
|
U_BOOT_CMD_MKENT(nv_read_value, 0, 1,
|
|
do_tpm_nv_read_value, "", ""),
|
|
U_BOOT_CMD_MKENT(nv_write_value, 0, 1,
|
|
do_tpm_nv_write_value, "", ""),
|
|
U_BOOT_CMD_MKENT(extend, 0, 1,
|
|
do_tpm_extend, "", ""),
|
|
U_BOOT_CMD_MKENT(pcr_read, 0, 1,
|
|
do_tpm_pcr_read, "", ""),
|
|
U_BOOT_CMD_MKENT(tsc_physical_presence, 0, 1,
|
|
do_tpm_tsc_physical_presence, "", ""),
|
|
U_BOOT_CMD_MKENT(read_pubek, 0, 1,
|
|
do_tpm_read_pubek, "", ""),
|
|
U_BOOT_CMD_MKENT(physical_set_deactivated, 0, 1,
|
|
do_tpm_physical_set_deactivated, "", ""),
|
|
U_BOOT_CMD_MKENT(get_capability, 0, 1,
|
|
do_tpm_get_capability, "", ""),
|
|
U_BOOT_CMD_MKENT(raw_transfer, 0, 1,
|
|
do_tpm_raw_transfer, "", ""),
|
|
U_BOOT_CMD_MKENT(nv_define, 0, 1,
|
|
do_tpm_nv_define, "", ""),
|
|
U_BOOT_CMD_MKENT(nv_read, 0, 1,
|
|
do_tpm_nv_read, "", ""),
|
|
U_BOOT_CMD_MKENT(nv_write, 0, 1,
|
|
do_tpm_nv_write, "", ""),
|
|
#ifdef CONFIG_TPM_AUTH_SESSIONS
|
|
U_BOOT_CMD_MKENT(oiap, 0, 1,
|
|
do_tpm_oiap, "", ""),
|
|
U_BOOT_CMD_MKENT(end_oiap, 0, 1,
|
|
do_tpm_end_oiap, "", ""),
|
|
U_BOOT_CMD_MKENT(load_key2_oiap, 0, 1,
|
|
do_tpm_load_key2_oiap, "", ""),
|
|
U_BOOT_CMD_MKENT(get_pub_key_oiap, 0, 1,
|
|
do_tpm_get_pub_key_oiap, "", ""),
|
|
#endif /* CONFIG_TPM_AUTH_SESSIONS */
|
|
};
|
|
|
|
static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
|
|
{
|
|
cmd_tbl_t *tpm_cmd;
|
|
|
|
if (argc < 2)
|
|
return CMD_RET_USAGE;
|
|
tpm_cmd = find_cmd_tbl(argv[1], tpm_commands, ARRAY_SIZE(tpm_commands));
|
|
if (!tpm_cmd)
|
|
return CMD_RET_USAGE;
|
|
|
|
return tpm_cmd->cmd(cmdtp, flag, argc - 1, argv + 1);
|
|
}
|
|
|
|
U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm,
|
|
"Issue a TPM command",
|
|
"cmd args...\n"
|
|
" - Issue TPM command <cmd> with arguments <args...>.\n"
|
|
"Admin Startup and State Commands:\n"
|
|
" init\n"
|
|
" - Put TPM into a state where it waits for 'startup' command.\n"
|
|
" startup mode\n"
|
|
" - Issue TPM_Starup command. <mode> is one of TPM_ST_CLEAR,\n"
|
|
" TPM_ST_STATE, and TPM_ST_DEACTIVATED.\n"
|
|
"Admin Testing Commands:\n"
|
|
" self_test_full\n"
|
|
" - Test all of the TPM capabilities.\n"
|
|
" continue_self_test\n"
|
|
" - Inform TPM that it should complete the self-test.\n"
|
|
"Admin Opt-in Commands:\n"
|
|
" physical_enable\n"
|
|
" - Set the PERMANENT disable flag to FALSE using physical presence as\n"
|
|
" authorization.\n"
|
|
" physical_disable\n"
|
|
" - Set the PERMANENT disable flag to TRUE using physical presence as\n"
|
|
" authorization.\n"
|
|
" physical_set_deactivated 0|1\n"
|
|
" - Set deactivated flag.\n"
|
|
"Admin Ownership Commands:\n"
|
|
" force_clear\n"
|
|
" - Issue TPM_ForceClear command.\n"
|
|
" tsc_physical_presence flags\n"
|
|
" - Set TPM device's Physical Presence flags to <flags>.\n"
|
|
"The Capability Commands:\n"
|
|
" get_capability cap_area sub_cap addr count\n"
|
|
" - Read <count> bytes of TPM capability indexed by <cap_area> and\n"
|
|
" <sub_cap> to memory address <addr>.\n"
|
|
#ifdef CONFIG_TPM_AUTH_SESSIONS
|
|
"Storage functions\n"
|
|
" loadkey2_oiap parent_handle key_addr key_len usage_auth\n"
|
|
" - loads a key data from memory address <key_addr>, <key_len> bytes\n"
|
|
" into TPM using the parent key <parent_handle> with authorization\n"
|
|
" <usage_auth> (20 bytes hex string).\n"
|
|
" get_pub_key_oiap key_handle usage_auth\n"
|
|
" - get the public key portion of a loaded key <key_handle> using\n"
|
|
" authorization <usage auth> (20 bytes hex string)\n"
|
|
#endif /* CONFIG_TPM_AUTH_SESSIONS */
|
|
"Endorsement Key Handling Commands:\n"
|
|
" read_pubek addr count\n"
|
|
" - Read <count> bytes of the public endorsement key to memory\n"
|
|
" address <addr>\n"
|
|
"Integrity Collection and Reporting Commands:\n"
|
|
" extend index digest_hex_string\n"
|
|
" - Add a new measurement to a PCR. Update PCR <index> with the 20-bytes\n"
|
|
" <digest_hex_string>\n"
|
|
" pcr_read index addr count\n"
|
|
" - Read <count> bytes from PCR <index> to memory address <addr>.\n"
|
|
#ifdef CONFIG_TPM_AUTH_SESSIONS
|
|
"Authorization Sessions\n"
|
|
" oiap\n"
|
|
" - setup an OIAP session\n"
|
|
" end_oiap\n"
|
|
" - terminates an active OIAP session\n"
|
|
#endif /* CONFIG_TPM_AUTH_SESSIONS */
|
|
"Non-volatile Storage Commands:\n"
|
|
" nv_define_space index permission size\n"
|
|
" - Establish a space at index <index> with <permission> of <size> bytes.\n"
|
|
" nv_read_value index addr count\n"
|
|
" - Read <count> bytes from space <index> to memory address <addr>.\n"
|
|
" nv_write_value index addr count\n"
|
|
" - Write <count> bytes from memory address <addr> to space <index>.\n"
|
|
"Miscellaneous helper functions:\n"
|
|
" raw_transfer byte_string\n"
|
|
" - Send a byte string <byte_string> to TPM and print the response.\n"
|
|
" Non-volatile storage helper functions:\n"
|
|
" These helper functions treat a non-volatile space as a non-padded\n"
|
|
" sequence of integer values. These integer values are defined by a type\n"
|
|
" string, which is a text string of 'bwd' characters: 'b' means a 8-bit\n"
|
|
" value, 'w' 16-bit value, 'd' 32-bit value. All helper functions take\n"
|
|
" a type string as their first argument.\n"
|
|
" nv_define type_string index perm\n"
|
|
" - Define a space <index> with permission <perm>.\n"
|
|
" nv_read types_string index vars...\n"
|
|
" - Read from space <index> to environment variables <vars...>.\n"
|
|
" nv_write types_string index values...\n"
|
|
" - Write to space <index> from values <values...>.\n"
|
|
);
|