1 /* SPDX-License-Identifier: GPL-2.0+ */
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 #ifndef _ENVIRONMENT_H_
8 #define _ENVIRONMENT_H_
10 #include <linux/kconfig.h>
12 /**************************************************************************
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.
20 * The environment is preceded by a 32 bit CRC over the data part.
22 *************************************************************************/
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)
28 # ifndef CONFIG_ENV_OFFSET
29 # define CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
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)
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
39 # ifndef CONFIG_ENV_SIZE
40 # define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
43 # error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"
45 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
46 # define CONFIG_ENV_SIZE_REDUND CONFIG_ENV_SIZE
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
53 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
54 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
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"
60 #endif /* CONFIG_ENV_IS_IN_FLASH */
62 #if defined(CONFIG_ENV_IS_IN_MMC)
63 # ifdef CONFIG_ENV_OFFSET_REDUND
64 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
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"
74 extern unsigned long nand_env_oob_offset;
75 # define CONFIG_ENV_OFFSET nand_env_oob_offset
77 # ifndef CONFIG_ENV_OFFSET
78 # error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
80 # ifdef CONFIG_ENV_OFFSET_REDUND
81 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
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"
87 #endif /* CONFIG_ENV_IS_IN_NAND */
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"
93 # ifndef CONFIG_ENV_UBI_VOLUME
94 # error "Need to define CONFIG_ENV_UBI_VOLUME when using CONFIG_ENV_IS_IN_UBI"
96 # if defined(CONFIG_ENV_UBI_VOLUME_REDUND)
97 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
99 # ifndef CONFIG_ENV_SIZE
100 # error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
102 # ifndef CONFIG_CMD_UBI
103 # error "Need to define CONFIG_CMD_UBI when using CONFIG_ENV_IS_IN_UBI"
105 #endif /* CONFIG_ENV_IS_IN_UBI */
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"
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.
121 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
122 # define ENV_IS_EMBEDDED
125 /* The build system likes to know if the env is embedded */
127 # ifdef ENV_IS_EMBEDDED
128 # ifndef CONFIG_ENV_IS_EMBEDDED
129 # define CONFIG_ENV_IS_EMBEDDED
134 #include "compiler.h"
136 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
137 # define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
139 # define ACTIVE_FLAG 1
140 # define OBSOLETE_FLAG 0
142 # define ENV_HEADER_SIZE (sizeof(uint32_t))
145 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
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 */
152 unsigned char data[ENV_SIZE]; /* Environment data */
155 #ifdef ENV_IS_EMBEDDED
156 extern env_t environment;
157 #endif /* ENV_IS_EMBEDDED */
159 extern const unsigned char default_environment[];
161 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
162 extern void env_reloc(void);
167 #include <env_attr.h>
168 #include <env_callback.h>
169 #include <env_flags.h>
172 /* Value for environment validity */
174 ENV_INVALID, /* No valid environment */
175 ENV_VALID, /* First or only environment is valid */
176 ENV_REDUND, /* Redundant environment is valid */
197 /* value for the various operations we want to perform on the env */
199 ENVOP_GET_CHAR, /* we want to call the get_char function */
200 ENVOP_INIT, /* we want to call the init function */
201 ENVOP_LOAD, /* we want to call the load function */
202 ENVOP_SAVE, /* we want to call the save function */
203 ENVOP_ERASE, /* we want to call the erase function */
208 enum env_location location;
211 * load() - Load the environment from storage
213 * This method is optional. If not provided, no environment will be
216 * @return 0 if OK, -ve on error
221 * save() - Save the environment to storage
223 * This method is required for 'saveenv' to work.
225 * @return 0 if OK, -ve on error
230 * erase() - Erase the environment on storage
232 * This method is optional and required for 'eraseenv' to work.
234 * @return 0 if OK, -ve on error
239 * init() - Set up the initial pre-relocation environment
241 * This method is optional.
243 * @return 0 if OK, -ENOENT if no initial environment could be found,
249 /* Declare a new environment location driver */
250 #define U_BOOT_ENV_LOCATION(__name) \
251 ll_entry_declare(struct env_driver, __name, env_driver)
253 /* Declare the name of a location */
254 #ifdef CONFIG_CMD_SAVEENV
255 #define ENV_NAME(_name) .name = _name,
257 #define ENV_NAME(_name)
260 #ifdef CONFIG_CMD_SAVEENV
261 #define env_save_ptr(x) x
263 #define env_save_ptr(x) NULL
266 extern struct hsearch_data env_htab;
268 /* Function that updates CRC of the enironment */
269 void env_crc_update(void);
271 /* Look up the variable from the default environment */
272 char *env_get_default(const char *name);
274 /* [re]set to the default environment */
275 void set_default_env(const char *s, int flags);
277 /* [re]set individual variables to their value in the default environment */
278 int set_default_vars(int nvars, char * const vars[], int flags);
280 /* Import from binary representation into hash table */
281 int env_import(const char *buf, int check);
283 /* Export from hash table into binary representation */
284 int env_export(env_t *env_out);
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);
293 * env_get_char() - Get a character from the early environment
295 * This reads from the pre-relocation environment
297 * @index: Index of character to read (0 = first)
298 * @return character read, or -ve on error
300 int env_get_char(int index);
303 * env_load() - Load the environment from storage
305 * @return 0 if OK, -ve on error
310 * env_save() - Save the environment to storage
312 * @return 0 if OK, -ve on error
317 * env_erase() - Erase the environment on storage
319 * @return 0 if OK, -ve on error
324 * env_fix_drivers() - Updates envdriver as per relocation
326 void env_fix_drivers(void);
328 void eth_parse_enetaddr(const char *addr, uint8_t *enetaddr);
329 int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr);
330 int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr);
332 #endif /* DO_DEPS_ONLY */
334 #endif /* _ENVIRONMENT_H_ */