include/environment.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * (C) Copyright 2002
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 #ifndef _ENVIRONMENT_H_
   8 #define _ENVIRONMENT_H_
   9
  10 #include <linux/kconfig.h>
  11
  12 /**************************************************************************
  13  *
  14  * The "environment" is stored as a list of '\0' terminated
  15  * "name=value" strings. The end of the list is marked by a double
  16  * '\0'. New entries are always added at the end. Deleting an entry
  17  * shifts the remaining entries to the front. Replacing an entry is a
  18  * combination of deleting the old value and adding the new one.
  19  *
  20  * The environment is preceded by a 32 bit CRC over the data part.
  21  *
  22  *************************************************************************/
  23
  24 #if defined(CONFIG_ENV_IS_IN_FLASH)
  25 # ifndef        CONFIG_ENV_ADDR
  26 #  define       CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
  27 # endif
  28 # ifndef        CONFIG_ENV_OFFSET
  29 #  define       CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
  30 # endif
  31 # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
  32 #  define       CONFIG_ENV_ADDR_REDUND  \
  33                 (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
  34 # endif
  35 # if defined(CONFIG_ENV_SECT_SIZE) || defined(CONFIG_ENV_SIZE)
  36 #  ifndef       CONFIG_ENV_SECT_SIZE
  37 #   define      CONFIG_ENV_SECT_SIZE    CONFIG_ENV_SIZE
  38 #  endif
  39 #  ifndef       CONFIG_ENV_SIZE
  40 #   define      CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
  41 #  endif
  42 # else
  43 #  error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"
  44 # endif
  45 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
  46 #  define CONFIG_ENV_SIZE_REDUND        CONFIG_ENV_SIZE
  47 # endif
  48 # if    (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) &&         \
  49         (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <=                  \
  50         (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
  51 #  define ENV_IS_EMBEDDED
  52 # endif
  53 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
  54 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  55 # endif
  56 # ifdef CONFIG_ENV_IS_EMBEDDED
  57 #  error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
  58 #  error "it is calculated automatically for you"
  59 # endif
  60 #endif  /* CONFIG_ENV_IS_IN_FLASH */
  61
  62 #if defined(CONFIG_ENV_IS_IN_MMC)
  63 # ifdef CONFIG_ENV_OFFSET_REDUND
  64 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  65 # endif
  66 #endif
  67
  68 #if defined(CONFIG_ENV_IS_IN_NAND)
  69 # if defined(CONFIG_ENV_OFFSET_OOB)
  70 #  ifdef CONFIG_ENV_OFFSET_REDUND
  71 #   error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
  72 #   error "is set"
  73 #  endif
  74 extern unsigned long nand_env_oob_offset;
  75 #  define CONFIG_ENV_OFFSET nand_env_oob_offset
  76 # else
  77 #  ifndef CONFIG_ENV_OFFSET
  78 #   error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
  79 #  endif
  80 #  ifdef CONFIG_ENV_OFFSET_REDUND
  81 #   define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  82 #  endif
  83 # endif /* CONFIG_ENV_OFFSET_OOB */
  84 # ifndef CONFIG_ENV_SIZE
  85 #  error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_NAND"
  86 # endif
  87 #endif /* CONFIG_ENV_IS_IN_NAND */
  88
  89 #if defined(CONFIG_ENV_IS_IN_UBI)
  90 # ifndef CONFIG_ENV_UBI_PART
  91 #  error "Need to define CONFIG_ENV_UBI_PART when using CONFIG_ENV_IS_IN_UBI"
  92 # endif
  93 # ifndef CONFIG_ENV_UBI_VOLUME
  94 #  error "Need to define CONFIG_ENV_UBI_VOLUME when using CONFIG_ENV_IS_IN_UBI"
  95 # endif
  96 # if defined(CONFIG_ENV_UBI_VOLUME_REDUND)
  97 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  98 # endif
  99 # ifndef CONFIG_ENV_SIZE
 100 #  error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
 101 # endif
 102 # ifndef CONFIG_CMD_UBI
 103 #  error "Need to define CONFIG_CMD_UBI when using CONFIG_ENV_IS_IN_UBI"
 104 # endif
 105 #endif /* CONFIG_ENV_IS_IN_UBI */
 106
 107 /* Embedded env is only supported for some flash types */
 108 #ifdef CONFIG_ENV_IS_EMBEDDED
 109 # if    !defined(CONFIG_ENV_IS_IN_FLASH)        && \
 110         !defined(CONFIG_ENV_IS_IN_NAND)         && \
 111         !defined(CONFIG_ENV_IS_IN_ONENAND)      && \
 112         !defined(CONFIG_ENV_IS_IN_SPI_FLASH)
 113 #  error "CONFIG_ENV_IS_EMBEDDED not supported for your flash type"
 114 # endif
 115 #endif
 116
 117 /*
 118  * For the flash types where embedded env is supported, but it cannot be
 119  * calculated automatically (i.e. NAND), take the board opt-in.
 120  */
 121 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
 122 # define ENV_IS_EMBEDDED
 123 #endif
 124
 125 /* The build system likes to know if the env is embedded */
 126 #ifdef DO_DEPS_ONLY
 127 # ifdef ENV_IS_EMBEDDED
 128 #  ifndef CONFIG_ENV_IS_EMBEDDED
 129 #   define CONFIG_ENV_IS_EMBEDDED
 130 #  endif
 131 # endif
 132 #endif
 133
 134 #include "compiler.h"
 135
 136 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 137 # define ENV_HEADER_SIZE        (sizeof(uint32_t) + 1)
 138
 139 # define ACTIVE_FLAG   1
 140 # define OBSOLETE_FLAG 0
 141 #else
 142 # define ENV_HEADER_SIZE        (sizeof(uint32_t))
 143 #endif
 144
 145 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
 146
 147 typedef struct environment_s {
 148         uint32_t        crc;            /* CRC32 over data bytes        */
 149 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 150         unsigned char   flags;          /* active/obsolete flags        */
 151 #endif
 152         unsigned char   data[ENV_SIZE]; /* Environment data             */
 153 } env_t;
 154
 155 #ifdef ENV_IS_EMBEDDED
 156 extern env_t environment;
 157 #endif /* ENV_IS_EMBEDDED */
 158
 159 extern const unsigned char default_environment[];
 160 extern env_t *env_ptr;
 161
 162 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 163 extern void env_reloc(void);
 164 #endif
 165
 166 #ifdef CONFIG_ENV_IS_IN_MMC
 167 #include <mmc.h>
 168
 169 extern int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
 170 # ifdef CONFIG_SYS_MMC_ENV_PART
 171 extern uint mmc_get_env_part(struct mmc *mmc);
 172 # endif
 173 #endif
 174
 175 #ifndef DO_DEPS_ONLY
 176
 177 #include <env_attr.h>
 178 #include <env_callback.h>
 179 #include <env_flags.h>
 180 #include <search.h>
 181
 182 /* Value for environment validity */
 183 enum env_valid {
 184         ENV_INVALID,    /* No valid environment */
 185         ENV_VALID,      /* First or only environment is valid */
 186         ENV_REDUND,     /* Redundant environment is valid */
 187 };
 188
 189 enum env_location {
 190         ENVL_UNKNOWN,
 191         ENVL_EEPROM,
 192         ENVL_EXT4,
 193         ENVL_FAT,
 194         ENVL_FLASH,
 195         ENVL_MMC,
 196         ENVL_NAND,
 197         ENVL_NVRAM,
 198         ENVL_ONENAND,
 199         ENVL_REMOTE,
 200         ENVL_SPI_FLASH,
 201         ENVL_UBI,
 202         ENVL_NOWHERE,
 203
 204         ENVL_COUNT,
 205 };
 206
 207 /* value for the various operations we want to perform on the env */
 208 enum env_operation {
 209         ENVOP_GET_CHAR, /* we want to call the get_char function */
 210         ENVOP_INIT,     /* we want to call the init function */
 211         ENVOP_LOAD,     /* we want to call the load function */
 212         ENVOP_SAVE,     /* we want to call the save function */
 213 };
 214
 215 struct env_driver {
 216         const char *name;
 217         enum env_location location;
 218
 219         /**
 220          * load() - Load the environment from storage
 221          *
 222          * This method is optional. If not provided, no environment will be
 223          * loaded.
 224          *
 225          * @return 0 if OK, -ve on error
 226          */
 227         int (*load)(void);
 228
 229         /**
 230          * save() - Save the environment to storage
 231          *
 232          * This method is required for 'saveenv' to work.
 233          *
 234          * @return 0 if OK, -ve on error
 235          */
 236         int (*save)(void);
 237
 238         /**
 239          * init() - Set up the initial pre-relocation environment
 240          *
 241          * This method is optional.
 242          *
 243          * @return 0 if OK, -ENOENT if no initial environment could be found,
 244          * other -ve on error
 245          */
 246         int (*init)(void);
 247 };
 248
 249 /* Declare a new environment location driver */
 250 #define U_BOOT_ENV_LOCATION(__name)                                     \
 251         ll_entry_declare(struct env_driver, __name, env_driver)
 252
 253 /* Declare the name of a location */
 254 #ifdef CONFIG_CMD_SAVEENV
 255 #define ENV_NAME(_name) .name = _name,
 256 #else
 257 #define ENV_NAME(_name)
 258 #endif
 259
 260 #ifdef CONFIG_CMD_SAVEENV
 261 #define env_save_ptr(x) x
 262 #else
 263 #define env_save_ptr(x) NULL
 264 #endif
 265
 266 extern struct hsearch_data env_htab;
 267
 268 /* Function that updates CRC of the enironment */
 269 void env_crc_update(void);
 270
 271 /* Look up the variable from the default environment */
 272 char *env_get_default(const char *name);
 273
 274 /* [re]set to the default environment */
 275 void set_default_env(const char *s);
 276
 277 /* [re]set individual variables to their value in the default environment */
 278 int set_default_vars(int nvars, char * const vars[], int flags);
 279
 280 /* Import from binary representation into hash table */
 281 int env_import(const char *buf, int check);
 282
 283 /* Export from hash table into binary representation */
 284 int env_export(env_t *env_out);
 285
 286 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 287 /* Select and import one of two redundant environments */
 288 int env_import_redund(const char *buf1, int buf1_status,
 289                       const char *buf2, int buf2_status);
 290 #endif
 291
 292 /**
 293  * env_get_char() - Get a character from the early environment
 294  *
 295  * This reads from the pre-relocation environment
 296  *
 297  * @index: Index of character to read (0 = first)
 298  * @return character read, or -ve on error
 299  */
 300 int env_get_char(int index);
 301
 302 /**
 303  * env_load() - Load the environment from storage
 304  *
 305  * @return 0 if OK, -ve on error
 306  */
 307 int env_load(void);
 308
 309 /**
 310  * env_save() - Save the environment to storage
 311  *
 312  * @return 0 if OK, -ve on error
 313  */
 314 int env_save(void);
 315
 316 /**
 317  * env_fix_drivers() - Updates envdriver as per relocation
 318  */
 319 void env_fix_drivers(void);
 320
 321 void eth_parse_enetaddr(const char *addr, uint8_t *enetaddr);
 322 int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr);
 323 int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr);
 324
 325 #endif /* DO_DEPS_ONLY */
 326
 327 #endif /* _ENVIRONMENT_H_ */