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 preceeded by a 32 bit CRC over the data part. 20 * 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 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE) 146 extern char *env_name_spec; 147 #endif 148 149 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE) 150 151 typedef struct environment_s { 152 uint32_t crc; /* CRC32 over data bytes */ 153 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT 154 unsigned char flags; /* active/obsolete flags */ 155 #endif 156 unsigned char data[ENV_SIZE]; /* Environment data */ 157 } env_t; 158 159 #ifdef ENV_IS_EMBEDDED 160 extern env_t environment; 161 #endif /* ENV_IS_EMBEDDED */ 162 163 extern const unsigned char default_environment[]; 164 extern env_t *env_ptr; 165 166 extern void env_relocate_spec(void); 167 extern unsigned char env_get_char_spec(int); 168 169 #if defined(CONFIG_NEEDS_MANUAL_RELOC) 170 extern void env_reloc(void); 171 #endif 172 173 #ifndef DO_DEPS_ONLY 174 175 #include <env_attr.h> 176 #include <env_callback.h> 177 #include <env_flags.h> 178 #include <search.h> 179 180 extern struct hsearch_data env_htab; 181 182 /* Function that returns a character from the environment */ 183 unsigned char env_get_char(int); 184 185 /* Function that returns a pointer to a value from the environment */ 186 const unsigned char *env_get_addr(int); 187 unsigned char env_get_char_memory(int index); 188 189 /* Function that updates CRC of the enironment */ 190 void env_crc_update(void); 191 192 /* Look up the variable from the default environment */ 193 char *getenv_default(const char *name); 194 195 /* [re]set to the default environment */ 196 void set_default_env(const char *s); 197 198 /* [re]set individual variables to their value in the default environment */ 199 int set_default_vars(int nvars, char * const vars[]); 200 201 /* Import from binary representation into hash table */ 202 int env_import(const char *buf, int check); 203 204 #endif /* DO_DEPS_ONLY */ 205 206 #endif /* _ENVIRONMENT_H_ */ 207