tools/env/fw_env.h

   1 /*
   2  * (C) Copyright 2002-2008
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <stdint.h>
   9 #include <uboot_aes.h>
  10
  11 /*
  12  * Programs using the library must check which API is available,
  13  * that varies depending on the U-Boot version.
  14  * This can be changed in future
  15  */
  16 #define FW_ENV_API_VERSION      1
  17
  18 struct env_opts {
  19 #ifdef CONFIG_FILE
  20         char *config_file;
  21 #endif
  22         int aes_flag; /* Is AES encryption used? */
  23         uint8_t aes_key[AES_KEY_LENGTH];
  24         char *lockname;
  25 };
  26
  27 int parse_aes_key(char *key, uint8_t *bin_key);
  28
  29 /**
  30  * fw_printenv() - print one or several environment variables
  31  *
  32  * @argc: number of variables names to be printed, prints all if 0
  33  * @argv: array of variable names to be printed, if argc != 0
  34  * @value_only: do not repeat the variable name, print the bare value,
  35  *          only one variable allowed with this option, argc must be 1
  36  * @opts: encryption key, configuration file, defaults are used if NULL
  37  *
  38  * Description:
  39  *  Uses fw_env_open, fw_getenv
  40  *
  41  * Return:
  42  *  0 on success, -1 on failure (modifies errno)
  43  */
  44 int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts);
  45
  46 /**
  47  * fw_env_set() - adds or removes one variable to the environment
  48  *
  49  * @argc: number of strings in argv, argv[0] is variable name,
  50  *          argc==1 means erase variable, argc > 1 means add a variable
  51  * @argv: argv[0] is variable name, argv[1..argc-1] are concatenated separated
  52  *           by single blank and set as the new value of the variable
  53  * @opts: how to retrieve environment from flash, defaults are used if NULL
  54  *
  55  * Description:
  56  *  Uses fw_env_open, fw_env_write, fw_env_flush
  57  *
  58  * Return:
  59  *  0 on success, -1 on failure (modifies errno)
  60  *
  61  * ERRORS:
  62  *  EROFS - some variables ("ethaddr", "serial#") cannot be modified
  63  */
  64 int fw_env_set(int argc, char *argv[], struct env_opts *opts);
  65
  66 /**
  67  * fw_parse_script() - adds or removes multiple variables with a batch script
  68  *
  69  * @fname: batch script file name
  70  * @opts: encryption key, configuration file, defaults are used if NULL
  71  *
  72  * Description:
  73  *  Uses fw_env_open, fw_env_write, fw_env_flush
  74  *
  75  * Return:
  76  *  0 success, -1 on failure (modifies errno)
  77  *
  78  * Script Syntax:
  79  *
  80  *  key [ [space]+ value]
  81  *
  82  *  lines starting with '#' treated as comment
  83  *
  84  *  A variable without value will be deleted. Any number of spaces are allowed
  85  *  between key and value. The value starts with the first non-space character
  86  *  and ends with newline. No comments allowed on these lines.  Spaces inside
  87  *  the value are preserved verbatim.
  88  *
  89  * Script Example:
  90  *
  91  *  netdev         eth0
  92  *
  93  *  kernel_addr    400000
  94  *
  95  *  foo            spaces           are copied verbatim
  96  *
  97  *  # delete variable bar
  98  *
  99  *  bar
 100  */
 101 int fw_parse_script(char *fname, struct env_opts *opts);
 102
 103
 104 /**
 105  * fw_env_open() - read enviroment from flash into RAM cache
 106  *
 107  * @opts: encryption key, configuration file, defaults are used if NULL
 108  *
 109  * Return:
 110  *  0 on success, -1 on failure (modifies errno)
 111  */
 112 int fw_env_open(struct env_opts *opts);
 113
 114 /**
 115  * fw_getenv() - lookup variable in the RAM cache
 116  *
 117  * @name: variable to be searched
 118  * Return:
 119  *  pointer to start of value, NULL if not found
 120  */
 121 char *fw_getenv(char *name);
 122
 123 /**
 124  * fw_env_write() - modify a variable held in the RAM cache
 125  *
 126  * @name: variable
 127  * @value: delete variable if NULL, otherwise create or overwrite the variable
 128  *
 129  * This is called in sequence to update the environment in RAM without updating
 130  * the copy in flash after each set
 131  *
 132  * Return:
 133  *  0 on success, -1 on failure (modifies errno)
 134  *
 135  * ERRORS:
 136  *  EROFS - some variables ("ethaddr", "serial#") cannot be modified
 137  */
 138 int fw_env_write(char *name, char *value);
 139
 140 /**
 141  * fw_env_flush - write the environment from RAM cache back to flash
 142  *
 143  * @opts: encryption key, configuration file, defaults are used if NULL
 144  *
 145  * Return:
 146  *  0 on success, -1 on failure (modifies errno)
 147  */
 148 int fw_env_flush(struct env_opts *opts);
 149
 150 /**
 151  * fw_env_close - free allocated structure and close env
 152  *
 153  * @opts: encryption key, configuration file, defaults are used if NULL
 154  *
 155  * Return:
 156  *  0 on success, -1 on failure (modifies errno)
 157  */
 158 int fw_env_close(struct env_opts *opts);
 159
 160
 161 /**
 162  * fw_env_version - return the current version of the library
 163  *
 164  * Return:
 165  *  version string of the library
 166  */
 167 char *fw_env_version(void);
 168
 169 unsigned long crc32(unsigned long, const unsigned char *, unsigned);