include/environment.h

   1 /*
   2  * (C) Copyright 2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #ifndef _ENVIRONMENT_H_
   9 #define _ENVIRONMENT_H_
  10
  11 #include <linux/kconfig.h>
  12
  13 /**************************************************************************
  14  *
  15  * The "environment" is stored as a list of '\0' terminated
  16  * "name=value" strings. The end of the list is marked by a double
  17  * '\0'. New entries are always added at the end. Deleting an entry
  18  * shifts the remaining entries to the front. Replacing an entry is a
  19  * combination of deleting the old value and adding the new one.
  20  *
  21  * The environment is preceded by a 32 bit CRC over the data part.
  22  *
  23  *************************************************************************/
  24
  25 #if defined(CONFIG_ENV_IS_IN_FLASH)
  26 # ifndef        CONFIG_ENV_ADDR
  27 #  define       CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
  28 # endif
  29 # ifndef        CONFIG_ENV_OFFSET
  30 #  define       CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
  31 # endif
  32 # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
  33 #  define       CONFIG_ENV_ADDR_REDUND  \
  34                 (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
  35 # endif
  36 # if defined(CONFIG_ENV_SECT_SIZE) || defined(CONFIG_ENV_SIZE)
  37 #  ifndef       CONFIG_ENV_SECT_SIZE
  38 #   define      CONFIG_ENV_SECT_SIZE    CONFIG_ENV_SIZE
  39 #  endif
  40 #  ifndef       CONFIG_ENV_SIZE
  41 #   define      CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
  42 #  endif
  43 # else
  44 #  error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"
  45 # endif
  46 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
  47 #  define CONFIG_ENV_SIZE_REDUND        CONFIG_ENV_SIZE
  48 # endif
  49 # if    (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) &&         \
  50         (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <=                  \
  51         (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
  52 #  define ENV_IS_EMBEDDED
  53 # endif
  54 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
  55 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  56 # endif
  57 # ifdef CONFIG_ENV_IS_EMBEDDED
  58 #  error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
  59 #  error "it is calculated automatically for you"
  60 # endif
  61 #endif  /* CONFIG_ENV_IS_IN_FLASH */
  62
  63 #if defined(CONFIG_ENV_IS_IN_MMC)
  64 # ifdef CONFIG_ENV_OFFSET_REDUND
  65 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  66 # endif
  67 #endif
  68
  69 #if defined(CONFIG_ENV_IS_IN_NAND)
  70 # if defined(CONFIG_ENV_OFFSET_OOB)
  71 #  ifdef CONFIG_ENV_OFFSET_REDUND
  72 #   error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
  73 #   error "is set"
  74 #  endif
  75 extern unsigned long nand_env_oob_offset;
  76 #  define CONFIG_ENV_OFFSET nand_env_oob_offset
  77 # else
  78 #  ifndef CONFIG_ENV_OFFSET
  79 #   error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
  80 #  endif
  81 #  ifdef CONFIG_ENV_OFFSET_REDUND
  82 #   define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  83 #  endif
  84 # endif /* CONFIG_ENV_OFFSET_OOB */
  85 # ifndef CONFIG_ENV_SIZE
  86 #  error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_NAND"
  87 # endif
  88 #endif /* CONFIG_ENV_IS_IN_NAND */
  89
  90 #if defined(CONFIG_ENV_IS_IN_UBI)
  91 # ifndef CONFIG_ENV_UBI_PART
  92 #  error "Need to define CONFIG_ENV_UBI_PART when using CONFIG_ENV_IS_IN_UBI"
  93 # endif
  94 # ifndef CONFIG_ENV_UBI_VOLUME
  95 #  error "Need to define CONFIG_ENV_UBI_VOLUME when using CONFIG_ENV_IS_IN_UBI"
  96 # endif
  97 # if defined(CONFIG_ENV_UBI_VOLUME_REDUND)
  98 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  99 # endif
 100 # ifndef CONFIG_ENV_SIZE
 101 #  error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
 102 # endif
 103 # ifndef CONFIG_CMD_UBI
 104 #  error "Need to define CONFIG_CMD_UBI when using CONFIG_ENV_IS_IN_UBI"
 105 # endif
 106 #endif /* CONFIG_ENV_IS_IN_UBI */
 107
 108 /* Embedded env is only supported for some flash types */
 109 #ifdef CONFIG_ENV_IS_EMBEDDED
 110 # if    !defined(CONFIG_ENV_IS_IN_FLASH)        && \
 111         !defined(CONFIG_ENV_IS_IN_NAND)         && \
 112         !defined(CONFIG_ENV_IS_IN_ONENAND)      && \
 113         !defined(CONFIG_ENV_IS_IN_SPI_FLASH)
 114 #  error "CONFIG_ENV_IS_EMBEDDED not supported for your flash type"
 115 # endif
 116 #endif
 117
 118 /*
 119  * For the flash types where embedded env is supported, but it cannot be
 120  * calculated automatically (i.e. NAND), take the board opt-in.
 121  */
 122 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
 123 # define ENV_IS_EMBEDDED
 124 #endif
 125
 126 /* The build system likes to know if the env is embedded */
 127 #ifdef DO_DEPS_ONLY
 128 # ifdef ENV_IS_EMBEDDED
 129 #  ifndef CONFIG_ENV_IS_EMBEDDED
 130 #   define CONFIG_ENV_IS_EMBEDDED
 131 #  endif
 132 # endif
 133 #endif
 134
 135 #include "compiler.h"
 136
 137 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 138 # define ENV_HEADER_SIZE        (sizeof(uint32_t) + 1)
 139
 140 # define ACTIVE_FLAG   1
 141 # define OBSOLETE_FLAG 0
 142 #else
 143 # define ENV_HEADER_SIZE        (sizeof(uint32_t))
 144 #endif
 145
 146 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
 147
 148 typedef struct environment_s {
 149         uint32_t        crc;            /* CRC32 over data bytes        */
 150 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 151         unsigned char   flags;          /* active/obsolete flags        */
 152 #endif
 153         unsigned char   data[ENV_SIZE]; /* Environment data             */
 154 } env_t;
 155
 156 #ifdef ENV_IS_EMBEDDED
 157 extern env_t environment;
 158 #endif /* ENV_IS_EMBEDDED */
 159
 160 extern const unsigned char default_environment[];
 161 extern env_t *env_ptr;
 162
 163 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 164 extern void env_reloc(void);
 165 #endif
 166
 167 #ifdef CONFIG_ENV_IS_IN_MMC
 168 #include <mmc.h>
 169
 170 extern int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
 171 # ifdef CONFIG_SYS_MMC_ENV_PART
 172 extern uint mmc_get_env_part(struct mmc *mmc);
 173 # endif
 174 #endif
 175
 176 #ifndef DO_DEPS_ONLY
 177
 178 #include <env_attr.h>
 179 #include <env_callback.h>
 180 #include <env_flags.h>
 181 #include <search.h>
 182
 183 /* Value for environment validity */
 184 enum env_valid {
 185         ENV_INVALID,    /* No valid environment */
 186         ENV_VALID,      /* First or only environment is valid */
 187         ENV_REDUND,     /* Redundant environment is valid */
 188 };
 189
 190 enum env_location {
 191         ENVL_UNKNOWN,
 192         ENVL_EEPROM,
 193         ENVL_EXT4,
 194         ENVL_FAT,
 195         ENVL_FLASH,
 196         ENVL_MMC,
 197         ENVL_NAND,
 198         ENVL_NVRAM,
 199         ENVL_ONENAND,
 200         ENVL_REMOTE,
 201         ENVL_SPI_FLASH,
 202         ENVL_UBI,
 203         ENVL_NOWHERE,
 204
 205         ENVL_COUNT,
 206 };
 207
 208 /* value for the various operations we want to perform on the env */
 209 enum env_operation {
 210         ENVOP_GET_CHAR, /* we want to call the get_char function */
 211         ENVOP_INIT,     /* we want to call the init function */
 212         ENVOP_LOAD,     /* we want to call the load function */
 213         ENVOP_SAVE,     /* we want to call the save function */
 214 };
 215
 216 struct env_driver {
 217         const char *name;
 218         enum env_location location;
 219
 220         /**
 221          * get_char() - Read a character from the environment
 222          *
 223          * This method is optional. If not provided, a default implementation
 224          * will read from gd->env_addr.
 225          *
 226          * @index: Index of character to read (0=first)
 227          * @return character read, or -ve on error
 228          */
 229         int (*get_char)(int index);
 230
 231         /**
 232          * load() - Load the environment from storage
 233          *
 234          * This method is optional. If not provided, no environment will be
 235          * loaded.
 236          *
 237          * @return 0 if OK, -ve on error
 238          */
 239         int (*load)(void);
 240
 241         /**
 242          * save() - Save the environment to storage
 243          *
 244          * This method is required for 'saveenv' to work.
 245          *
 246          * @return 0 if OK, -ve on error
 247          */
 248         int (*save)(void);
 249
 250         /**
 251          * init() - Set up the initial pre-relocation environment
 252          *
 253          * This method is optional.
 254          *
 255          * @return 0 if OK, -ENOENT if no initial environment could be found,
 256          * other -ve on error
 257          */
 258         int (*init)(void);
 259 };
 260
 261 /* Declare a new environment location driver */
 262 #define U_BOOT_ENV_LOCATION(__name)                                     \
 263         ll_entry_declare(struct env_driver, __name, env_driver)
 264
 265 /* Declare the name of a location */
 266 #ifdef CONFIG_CMD_SAVEENV
 267 #define ENV_NAME(_name) .name = _name,
 268 #else
 269 #define ENV_NAME(_name)
 270 #endif
 271
 272 #ifdef CONFIG_CMD_SAVEENV
 273 #define env_save_ptr(x) x
 274 #else
 275 #define env_save_ptr(x) NULL
 276 #endif
 277
 278 extern struct hsearch_data env_htab;
 279
 280 /* Function that updates CRC of the enironment */
 281 void env_crc_update(void);
 282
 283 /* Look up the variable from the default environment */
 284 char *env_get_default(const char *name);
 285
 286 /* [re]set to the default environment */
 287 void set_default_env(const char *s);
 288
 289 /* [re]set individual variables to their value in the default environment */
 290 int set_default_vars(int nvars, char * const vars[]);
 291
 292 /* Import from binary representation into hash table */
 293 int env_import(const char *buf, int check);
 294
 295 /* Export from hash table into binary representation */
 296 int env_export(env_t *env_out);
 297
 298 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 299 /* Select and import one of two redundant environments */
 300 int env_import_redund(const char *buf1, int buf1_status,
 301                       const char *buf2, int buf2_status);
 302 #endif
 303
 304 /**
 305  * env_get_char() - Get a character from the early environment
 306  *
 307  * This reads from the pre-relocation environemnt
 308  *
 309  * @index: Index of character to read (0 = first)
 310  * @return character read, or -ve on error
 311  */
 312 int env_get_char(int index);
 313
 314 /**
 315  * env_load() - Load the environment from storage
 316  *
 317  * @return 0 if OK, -ve on error
 318  */
 319 int env_load(void);
 320
 321 /**
 322  * env_save() - Save the environment to storage
 323  *
 324  * @return 0 if OK, -ve on error
 325  */
 326 int env_save(void);
 327
 328 #endif /* DO_DEPS_ONLY */
 329
 330 #endif /* _ENVIRONMENT_H_ */