1 /* SPDX-License-Identifier: GPL-2.0+ */
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.
8 * It should not be included by board files, drivers and code other than that
9 * related to the environment implementation.
12 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
15 #ifndef _ENV_INTERNAL_H_
16 #define _ENV_INTERNAL_H_
18 #include <linux/kconfig.h>
20 /**************************************************************************
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.
28 * The environment is preceded by a 32 bit CRC over the data part.
30 *************************************************************************/
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
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
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"
48 #endif /* CONFIG_ENV_IS_IN_FLASH */
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"
56 extern unsigned long nand_env_oob_offset;
57 # endif /* CONFIG_ENV_OFFSET_OOB */
58 #endif /* CONFIG_ENV_IS_IN_NAND */
61 * For the flash types where embedded env is supported, but it cannot be
62 * calculated automatically (i.e. NAND), take the board opt-in.
64 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
65 # define ENV_IS_EMBEDDED
68 /* The build system likes to know if the env is embedded */
70 # ifdef ENV_IS_EMBEDDED
71 # ifndef CONFIG_ENV_IS_EMBEDDED
72 # define CONFIG_ENV_IS_EMBEDDED
79 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
80 # define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
82 # define ENV_HEADER_SIZE (sizeof(uint32_t))
85 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
88 * If the environment is in RAM, allocate extra space for it in the malloc
91 #if defined(CONFIG_ENV_IS_EMBEDDED)
92 #define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
93 #elif (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE < CONFIG_SYS_MONITOR_BASE) || \
94 (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN) || \
95 defined(CONFIG_ENV_IS_IN_NVRAM)
96 #define TOTAL_MALLOC_LEN (CONFIG_SYS_MALLOC_LEN + CONFIG_ENV_SIZE)
98 #define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
101 typedef struct environment_s {
102 uint32_t crc; /* CRC32 over data bytes */
103 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
104 unsigned char flags; /* active/obsolete flags ENVF_REDUND_ */
106 unsigned char data[ENV_SIZE]; /* Environment data */
109 #ifdef ENV_IS_EMBEDDED
110 extern env_t embedded_environment;
111 #endif /* ENV_IS_EMBEDDED */
113 #ifdef DEFAULT_ENV_IS_RW
114 extern char default_environment[];
116 extern const char default_environment[];
121 #include <env_attr.h>
122 #include <env_callback.h>
123 #include <env_flags.h>
144 /* value for the various operations we want to perform on the env */
146 ENVOP_GET_CHAR, /* we want to call the get_char function */
147 ENVOP_INIT, /* we want to call the init function */
148 ENVOP_LOAD, /* we want to call the load function */
149 ENVOP_SAVE, /* we want to call the save function */
150 ENVOP_ERASE, /* we want to call the erase function */
155 enum env_location location;
158 * load() - Load the environment from storage
160 * This method is required for loading environment
162 * @return 0 if OK, -ve on error
167 * save() - Save the environment to storage
169 * This method is required for 'saveenv' to work.
171 * @return 0 if OK, -ve on error
176 * erase() - Erase the environment on storage
178 * This method is optional and required for 'eraseenv' to work.
180 * @return 0 if OK, -ve on error
185 * init() - Set up the initial pre-relocation environment
187 * This method is optional.
189 * @return 0 if OK, -ENOENT if no initial environment could be found,
195 /* Declare a new environment location driver */
196 #define U_BOOT_ENV_LOCATION(__name) \
197 ll_entry_declare(struct env_driver, __name, env_driver)
199 /* Declare the name of a location */
200 #ifdef CONFIG_CMD_SAVEENV
201 #define ENV_NAME(_name) .name = _name,
203 #define ENV_NAME(_name)
206 #ifdef CONFIG_CMD_SAVEENV
207 #define env_save_ptr(x) x
209 #define env_save_ptr(x) NULL
212 #define ENV_SAVE_PTR(x) (CONFIG_IS_ENABLED(SAVEENV) ? (x) : NULL)
213 #define ENV_ERASE_PTR(x) (CONFIG_IS_ENABLED(CMD_ERASEENV) ? (x) : NULL)
215 extern struct hsearch_data env_htab;
218 * env_ext4_get_intf() - Provide the interface for env in EXT4
220 * It is a weak function allowing board to overidde the default interface for
221 * U-Boot env in EXT4: CONFIG_ENV_EXT4_INTERFACE
223 * Return: string of interface, empty if not supported
225 const char *env_ext4_get_intf(void);
228 * env_ext4_get_dev_part() - Provide the device and partition for env in EXT4
230 * It is a weak function allowing board to overidde the default device and
231 * partition used for U-Boot env in EXT4: CONFIG_ENV_EXT4_DEVICE_AND_PART
233 * Return: string of device and partition
235 const char *env_ext4_get_dev_part(void);
238 * arch_env_get_location()- Provide the best location for the U-Boot environment
240 * It is a weak function allowing board to overidde the environment location
241 * on architecture level. This has lower priority than env_get_location(),
242 * which can be defined on board level.
244 * @op: operations performed on the environment
245 * @prio: priority between the multiple environments, 0 being the
247 * Return: an enum env_location value on success, or -ve error code.
249 enum env_location arch_env_get_location(enum env_operation op, int prio);
252 * env_get_location()- Provide the best location for the U-Boot environment
254 * It is a weak function allowing board to overidde the environment location
255 * on board level. This has higher priority than arch_env_get_location(),
256 * which can be defined on architecture level.
258 * @op: operations performed on the environment
259 * @prio: priority between the multiple environments, 0 being the
261 * Return: an enum env_location value on success, or -ve error code.
263 enum env_location env_get_location(enum env_operation op, int prio);
266 * env_fat_get_intf() - Provide the interface for env in FAT
268 * It is a weak function allowing board to overidde the default interface for
269 * U-Boot env in FAT: CONFIG_ENV_FAT_INTERFACE
271 * Return: string of interface, empty if not supported
273 const char *env_fat_get_intf(void);
276 * env_fat_get_dev_part() - Provide the device and partition for env in FAT
278 * It is a weak function allowing board to overidde the default device and
279 * partition used for U-Boot env in FAT: CONFIG_ENV_FAT_DEVICE_AND_PART
281 * Return: string of device and partition
283 char *env_fat_get_dev_part(void);
284 #endif /* DO_DEPS_ONLY */
286 #endif /* _ENV_INTERNAL_H_ */