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 # define CONFIG_ENV_OFFSET nand_env_oob_offset
58 # endif /* CONFIG_ENV_OFFSET_OOB */
59 #endif /* CONFIG_ENV_IS_IN_NAND */
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.
65 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
66 # define ENV_IS_EMBEDDED
69 /* The build system likes to know if the env is embedded */
71 # ifdef ENV_IS_EMBEDDED
72 # ifndef CONFIG_ENV_IS_EMBEDDED
73 # define CONFIG_ENV_IS_EMBEDDED
80 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
81 # define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
83 # define ENV_HEADER_SIZE (sizeof(uint32_t))
86 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
89 * If the environment is in RAM, allocate extra space for it in the malloc
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)
99 #define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
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_ */
107 unsigned char data[ENV_SIZE]; /* Environment data */
110 #ifdef ENV_IS_EMBEDDED
111 extern env_t embedded_environment;
112 #endif /* ENV_IS_EMBEDDED */
114 extern const unsigned char default_environment[];
118 #include <env_attr.h>
119 #include <env_callback.h>
120 #include <env_flags.h>
141 /* value for the various operations we want to perform on the env */
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 */
152 enum env_location location;
155 * load() - Load the environment from storage
157 * This method is optional. If not provided, no environment will be
160 * @return 0 if OK, -ve on error
165 * save() - Save the environment to storage
167 * This method is required for 'saveenv' to work.
169 * @return 0 if OK, -ve on error
174 * erase() - Erase the environment on storage
176 * This method is optional and required for 'eraseenv' to work.
178 * @return 0 if OK, -ve on error
183 * init() - Set up the initial pre-relocation environment
185 * This method is optional.
187 * @return 0 if OK, -ENOENT if no initial environment could be found,
193 /* Declare a new environment location driver */
194 #define U_BOOT_ENV_LOCATION(__name) \
195 ll_entry_declare(struct env_driver, __name, env_driver)
197 /* Declare the name of a location */
198 #ifdef CONFIG_CMD_SAVEENV
199 #define ENV_NAME(_name) .name = _name,
201 #define ENV_NAME(_name)
204 #ifdef CONFIG_CMD_SAVEENV
205 #define env_save_ptr(x) x
207 #define env_save_ptr(x) NULL
210 #define ENV_SAVE_PTR(x) (CONFIG_IS_ENABLED(SAVEENV) ? (x) : NULL)
212 extern struct hsearch_data env_htab;
215 * env_get_location()- Provide the best location for the U-Boot environment
217 * It is a weak function allowing board to overidde the environment location
219 * @op: operations performed on the environment
220 * @prio: priority between the multiple environments, 0 being the
222 * @return an enum env_location value on success, or -ve error code.
224 enum env_location env_get_location(enum env_operation op, int prio);
225 #endif /* DO_DEPS_ONLY */
227 #endif /* _ENV_INTERNAL_H_ */