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, int flags); 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_ */ 328