include/env_internal.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Internal environment header file. This includes direct access to environment
   4  * information such as its size and offset, direct access to the default
   5  * environment and embedded environment (if used). It also provides environment
   6  * drivers with various declarations.
   7  *
   8  * It should not be included by board files, drivers and code other than that
   9  * related to the environment implementation.
  10  *
  11  * (C) Copyright 2002
  12  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  13  */
  14
  15 #ifndef _ENV_INTERNAL_H_
  16 #define _ENV_INTERNAL_H_
  17
  18 #include <linux/kconfig.h>
  19
  20 /**************************************************************************
  21  *
  22  * The "environment" is stored as a list of '\0' terminated
  23  * "name=value" strings. The end of the list is marked by a double
  24  * '\0'. New entries are always added at the end. Deleting an entry
  25  * shifts the remaining entries to the front. Replacing an entry is a
  26  * combination of deleting the old value and adding the new one.
  27  *
  28  * The environment is preceded by a 32 bit CRC over the data part.
  29  *
  30  *************************************************************************/
  31
  32 #if defined(CONFIG_ENV_IS_IN_FLASH)
  33 # if    defined(CONFIG_ENV_ADDR_REDUND) && \
  34         ((CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) &&                \
  35         (CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SIZE) <=           \
  36         (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN))
  37 #  define ENV_IS_EMBEDDED
  38 # endif
  39 # if    (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) &&         \
  40         (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <=                  \
  41         (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
  42 #  define ENV_IS_EMBEDDED
  43 # endif
  44 # ifdef CONFIG_ENV_IS_EMBEDDED
  45 #  error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
  46 #  error "it is calculated automatically for you"
  47 # endif
  48 #endif  /* CONFIG_ENV_IS_IN_FLASH */
  49
  50 #if defined(CONFIG_ENV_IS_IN_NAND)
  51 # if defined(CONFIG_ENV_OFFSET_OOB)
  52 #  ifdef CONFIG_ENV_OFFSET_REDUND
  53 #   error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
  54 #   error "is set"
  55 #  endif
  56 extern unsigned long nand_env_oob_offset;
  57 #  define CONFIG_ENV_OFFSET nand_env_oob_offset
  58 # endif /* CONFIG_ENV_OFFSET_OOB */
  59 #endif /* CONFIG_ENV_IS_IN_NAND */
  60
  61 /*
  62  * For the flash types where embedded env is supported, but it cannot be
  63  * calculated automatically (i.e. NAND), take the board opt-in.
  64  */
  65 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
  66 # define ENV_IS_EMBEDDED
  67 #endif
  68
  69 /* The build system likes to know if the env is embedded */
  70 #ifdef DO_DEPS_ONLY
  71 # ifdef ENV_IS_EMBEDDED
  72 #  ifndef CONFIG_ENV_IS_EMBEDDED
  73 #   define CONFIG_ENV_IS_EMBEDDED
  74 #  endif
  75 # endif
  76 #endif
  77
  78 #include "compiler.h"
  79
  80 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
  81 # define ENV_HEADER_SIZE        (sizeof(uint32_t) + 1)
  82 #else
  83 # define ENV_HEADER_SIZE        (sizeof(uint32_t))
  84 #endif
  85
  86 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
  87
  88 /*
  89  * If the environment is in RAM, allocate extra space for it in the malloc
  90  * region.
  91  */
  92 #if defined(CONFIG_ENV_IS_EMBEDDED)
  93 #define TOTAL_MALLOC_LEN        CONFIG_SYS_MALLOC_LEN
  94 #elif (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE < CONFIG_SYS_MONITOR_BASE) || \
  95       (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN) || \
  96       defined(CONFIG_ENV_IS_IN_NVRAM)
  97 #define TOTAL_MALLOC_LEN        (CONFIG_SYS_MALLOC_LEN + CONFIG_ENV_SIZE)
  98 #else
  99 #define TOTAL_MALLOC_LEN        CONFIG_SYS_MALLOC_LEN
 100 #endif
 101
 102 typedef struct environment_s {
 103         uint32_t        crc;            /* CRC32 over data bytes        */
 104 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 105         unsigned char   flags;          /* active/obsolete flags ENVF_REDUND_ */
 106 #endif
 107         unsigned char   data[ENV_SIZE]; /* Environment data             */
 108 } env_t;
 109
 110 #ifdef ENV_IS_EMBEDDED
 111 extern env_t embedded_environment;
 112 #endif /* ENV_IS_EMBEDDED */
 113
 114 extern const unsigned char default_environment[];
 115
 116 #ifndef DO_DEPS_ONLY
 117
 118 #include <env_attr.h>
 119 #include <env_callback.h>
 120 #include <env_flags.h>
 121 #include <search.h>
 122
 123 enum env_location {
 124         ENVL_UNKNOWN,
 125         ENVL_EEPROM,
 126         ENVL_EXT4,
 127         ENVL_FAT,
 128         ENVL_FLASH,
 129         ENVL_MMC,
 130         ENVL_NAND,
 131         ENVL_NVRAM,
 132         ENVL_ONENAND,
 133         ENVL_REMOTE,
 134         ENVL_SPI_FLASH,
 135         ENVL_UBI,
 136         ENVL_NOWHERE,
 137
 138         ENVL_COUNT,
 139 };
 140
 141 /* value for the various operations we want to perform on the env */
 142 enum env_operation {
 143         ENVOP_GET_CHAR, /* we want to call the get_char function */
 144         ENVOP_INIT,     /* we want to call the init function */
 145         ENVOP_LOAD,     /* we want to call the load function */
 146         ENVOP_SAVE,     /* we want to call the save function */
 147         ENVOP_ERASE,    /* we want to call the erase function */
 148 };
 149
 150 struct env_driver {
 151         const char *name;
 152         enum env_location location;
 153
 154         /**
 155          * load() - Load the environment from storage
 156          *
 157          * This method is optional. If not provided, no environment will be
 158          * loaded.
 159          *
 160          * @return 0 if OK, -ve on error
 161          */
 162         int (*load)(void);
 163
 164         /**
 165          * save() - Save the environment to storage
 166          *
 167          * This method is required for 'saveenv' to work.
 168          *
 169          * @return 0 if OK, -ve on error
 170          */
 171         int (*save)(void);
 172
 173         /**
 174          * erase() - Erase the environment on storage
 175          *
 176          * This method is optional and required for 'eraseenv' to work.
 177          *
 178          * @return 0 if OK, -ve on error
 179          */
 180         int (*erase)(void);
 181
 182         /**
 183          * init() - Set up the initial pre-relocation environment
 184          *
 185          * This method is optional.
 186          *
 187          * @return 0 if OK, -ENOENT if no initial environment could be found,
 188          * other -ve on error
 189          */
 190         int (*init)(void);
 191 };
 192
 193 /* Declare a new environment location driver */
 194 #define U_BOOT_ENV_LOCATION(__name)                                     \
 195         ll_entry_declare(struct env_driver, __name, env_driver)
 196
 197 /* Declare the name of a location */
 198 #ifdef CONFIG_CMD_SAVEENV
 199 #define ENV_NAME(_name) .name = _name,
 200 #else
 201 #define ENV_NAME(_name)
 202 #endif
 203
 204 #ifdef CONFIG_CMD_SAVEENV
 205 #define env_save_ptr(x) x
 206 #else
 207 #define env_save_ptr(x) NULL
 208 #endif
 209
 210 #define ENV_SAVE_PTR(x) (CONFIG_IS_ENABLED(SAVEENV) ? (x) : NULL)
 211
 212 extern struct hsearch_data env_htab;
 213
 214 #endif /* DO_DEPS_ONLY */
 215
 216 #endif /* _ENV_INTERNAL_H_ */