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 /**************************************************************************
  12  *
  13  * The "environment" is stored as a list of '\0' terminated
  14  * "name=value" strings. The end of the list is marked by a double
  15  * '\0'. New entries are always added at the end. Deleting an entry
  16  * shifts the remaining entries to the front. Replacing an entry is a
  17  * combination of deleting the old value and adding the new one.
  18  *
  19  * The environment is preceded by a 32 bit CRC over the data part.
  20  *
  21  *************************************************************************/
  22
  23 #if defined(CONFIG_ENV_IS_IN_FLASH)
  24 # ifndef        CONFIG_ENV_ADDR
  25 #  define       CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
  26 # endif
  27 # ifndef        CONFIG_ENV_OFFSET
  28 #  define       CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
  29 # endif
  30 # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
  31 #  define       CONFIG_ENV_ADDR_REDUND  \
  32                 (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
  33 # endif
  34 # if defined(CONFIG_ENV_SECT_SIZE) || defined(CONFIG_ENV_SIZE)
  35 #  ifndef       CONFIG_ENV_SECT_SIZE
  36 #   define      CONFIG_ENV_SECT_SIZE    CONFIG_ENV_SIZE
  37 #  endif
  38 #  ifndef       CONFIG_ENV_SIZE
  39 #   define      CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
  40 #  endif
  41 # else
  42 #  error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"
  43 # endif
  44 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
  45 #  define CONFIG_ENV_SIZE_REDUND        CONFIG_ENV_SIZE
  46 # endif
  47 # if    (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) &&         \
  48         (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <=                  \
  49         (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
  50 #  define ENV_IS_EMBEDDED
  51 # endif
  52 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
  53 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  54 # endif
  55 # ifdef CONFIG_ENV_IS_EMBEDDED
  56 #  error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
  57 #  error "it is calculated automatically for you"
  58 # endif
  59 #endif  /* CONFIG_ENV_IS_IN_FLASH */
  60
  61 #if defined(CONFIG_ENV_IS_IN_MMC)
  62 # ifdef CONFIG_ENV_OFFSET_REDUND
  63 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  64 # endif
  65 #endif
  66
  67 #if defined(CONFIG_ENV_IS_IN_NAND)
  68 # if defined(CONFIG_ENV_OFFSET_OOB)
  69 #  ifdef CONFIG_ENV_OFFSET_REDUND
  70 #   error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
  71 #   error "is set"
  72 #  endif
  73 extern unsigned long nand_env_oob_offset;
  74 #  define CONFIG_ENV_OFFSET nand_env_oob_offset
  75 # else
  76 #  ifndef CONFIG_ENV_OFFSET
  77 #   error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
  78 #  endif
  79 #  ifdef CONFIG_ENV_OFFSET_REDUND
  80 #   define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  81 #  endif
  82 # endif /* CONFIG_ENV_OFFSET_OOB */
  83 # ifndef CONFIG_ENV_SIZE
  84 #  error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_NAND"
  85 # endif
  86 #endif /* CONFIG_ENV_IS_IN_NAND */
  87
  88 #if defined(CONFIG_ENV_IS_IN_UBI)
  89 # ifndef CONFIG_ENV_UBI_PART
  90 #  error "Need to define CONFIG_ENV_UBI_PART when using CONFIG_ENV_IS_IN_UBI"
  91 # endif
  92 # ifndef CONFIG_ENV_UBI_VOLUME
  93 #  error "Need to define CONFIG_ENV_UBI_VOLUME when using CONFIG_ENV_IS_IN_UBI"
  94 # endif
  95 # if defined(CONFIG_ENV_UBI_VOLUME_REDUND)
  96 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  97 # endif
  98 # ifndef CONFIG_ENV_SIZE
  99 #  error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
 100 # endif
 101 # ifndef CONFIG_CMD_UBI
 102 #  error "Need to define CONFIG_CMD_UBI when using CONFIG_ENV_IS_IN_UBI"
 103 # endif
 104 #endif /* CONFIG_ENV_IS_IN_UBI */
 105
 106 /* Embedded env is only supported for some flash types */
 107 #ifdef CONFIG_ENV_IS_EMBEDDED
 108 # if    !defined(CONFIG_ENV_IS_IN_FLASH)        && \
 109         !defined(CONFIG_ENV_IS_IN_NAND)         && \
 110         !defined(CONFIG_ENV_IS_IN_ONENAND)      && \
 111         !defined(CONFIG_ENV_IS_IN_SPI_FLASH)
 112 #  error "CONFIG_ENV_IS_EMBEDDED not supported for your flash type"
 113 # endif
 114 #endif
 115
 116 /*
 117  * For the flash types where embedded env is supported, but it cannot be
 118  * calculated automatically (i.e. NAND), take the board opt-in.
 119  */
 120 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
 121 # define ENV_IS_EMBEDDED
 122 #endif
 123
 124 /* The build system likes to know if the env is embedded */
 125 #ifdef DO_DEPS_ONLY
 126 # ifdef ENV_IS_EMBEDDED
 127 #  ifndef CONFIG_ENV_IS_EMBEDDED
 128 #   define CONFIG_ENV_IS_EMBEDDED
 129 #  endif
 130 # endif
 131 #endif
 132
 133 #include "compiler.h"
 134
 135 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 136 # define ENV_HEADER_SIZE        (sizeof(uint32_t) + 1)
 137
 138 # define ACTIVE_FLAG   1
 139 # define OBSOLETE_FLAG 0
 140 #else
 141 # define ENV_HEADER_SIZE        (sizeof(uint32_t))
 142 #endif
 143
 144 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
 145 extern char *env_name_spec;
 146 #endif
 147
 148 #ifdef CONFIG_ENV_AES
 149 /* Make sure the payload is multiple of AES block size */
 150 #define ENV_SIZE ((CONFIG_ENV_SIZE - ENV_HEADER_SIZE) & ~(16 - 1))
 151 #else
 152 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
 153 #endif
 154
 155 typedef struct environment_s {
 156         uint32_t        crc;            /* CRC32 over data bytes        */
 157 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 158         unsigned char   flags;          /* active/obsolete flags        */
 159 #endif
 160         unsigned char   data[ENV_SIZE]; /* Environment data             */
 161 } env_t
 162 #ifdef CONFIG_ENV_AES
 163 /* Make sure the env is aligned to block size. */
 164 __attribute__((aligned(16)))
 165 #endif
 166 ;
 167
 168 #ifdef ENV_IS_EMBEDDED
 169 extern env_t environment;
 170 #endif /* ENV_IS_EMBEDDED */
 171
 172 extern const unsigned char default_environment[];
 173 extern env_t *env_ptr;
 174
 175 extern void env_relocate_spec(void);
 176 extern unsigned char env_get_char_spec(int);
 177
 178 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 179 extern void env_reloc(void);
 180 #endif
 181
 182 #ifdef CONFIG_ENV_IS_IN_MMC
 183 #include <mmc.h>
 184
 185 extern int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
 186 # ifdef CONFIG_SYS_MMC_ENV_PART
 187 extern uint mmc_get_env_part(struct mmc *mmc);
 188 # endif
 189 #endif
 190
 191 #ifndef DO_DEPS_ONLY
 192
 193 #include <env_attr.h>
 194 #include <env_callback.h>
 195 #include <env_flags.h>
 196 #include <search.h>
 197
 198 extern struct hsearch_data env_htab;
 199
 200 /* Function that returns a character from the environment */
 201 unsigned char env_get_char(int);
 202
 203 /* Function that returns a pointer to a value from the environment */
 204 const unsigned char *env_get_addr(int);
 205 unsigned char env_get_char_memory(int index);
 206
 207 /* Function that updates CRC of the enironment */
 208 void env_crc_update(void);
 209
 210 /* Look up the variable from the default environment */
 211 char *getenv_default(const char *name);
 212
 213 /* [re]set to the default environment */
 214 void set_default_env(const char *s);
 215
 216 /* [re]set individual variables to their value in the default environment */
 217 int set_default_vars(int nvars, char * const vars[]);
 218
 219 /* Import from binary representation into hash table */
 220 int env_import(const char *buf, int check);
 221
 222 /* Export from hash table into binary representation */
 223 int env_export(env_t *env_out);
 224
 225 #endif /* DO_DEPS_ONLY */
 226
 227 #endif /* _ENVIRONMENT_H_ */