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 # ifndef CONFIG_ENV_ADDR
34 # define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
36 # ifndef CONFIG_ENV_OFFSET
37 # define CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
39 # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
40 # define CONFIG_ENV_ADDR_REDUND \
41 (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
43 # if defined(CONFIG_ENV_SECT_SIZE) || defined(CONFIG_ENV_SIZE)
44 # ifndef CONFIG_ENV_SECT_SIZE
45 # define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
47 # ifndef CONFIG_ENV_SIZE
48 # define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
51 # error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"
53 # if defined(CONFIG_ENV_ADDR_REDUND) && \
54 ((CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
55 (CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SIZE) <= \
56 (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN))
57 # define ENV_IS_EMBEDDED
59 # if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
60 (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= \
61 (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
62 # define ENV_IS_EMBEDDED
64 # ifdef CONFIG_ENV_IS_EMBEDDED
65 # error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
66 # error "it is calculated automatically for you"
68 #endif /* CONFIG_ENV_IS_IN_FLASH */
70 #if defined(CONFIG_ENV_IS_IN_NAND)
71 # if defined(CONFIG_ENV_OFFSET_OOB)
72 # ifdef CONFIG_ENV_OFFSET_REDUND
73 # error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
76 extern unsigned long nand_env_oob_offset;
77 # define CONFIG_ENV_OFFSET nand_env_oob_offset
79 # ifndef CONFIG_ENV_OFFSET
80 # error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
82 # endif /* CONFIG_ENV_OFFSET_OOB */
83 # ifndef CONFIG_ENV_SIZE
84 # error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_NAND"
86 #endif /* CONFIG_ENV_IS_IN_NAND */
88 #if defined(CONFIG_ENV_IS_IN_UBI)
89 # ifndef CONFIG_ENV_UBI_PART
90 # error "Need to define CONFIG_ENV_UBI_PART when using CONFIG_ENV_IS_IN_UBI"
92 # ifndef CONFIG_ENV_UBI_VOLUME
93 # error "Need to define CONFIG_ENV_UBI_VOLUME when using CONFIG_ENV_IS_IN_UBI"
95 # ifndef CONFIG_ENV_SIZE
96 # error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
98 # ifndef CONFIG_CMD_UBI
99 # error "Need to define CONFIG_CMD_UBI when using CONFIG_ENV_IS_IN_UBI"
101 #endif /* CONFIG_ENV_IS_IN_UBI */
103 /* Embedded env is only supported for some flash types */
104 #ifdef CONFIG_ENV_IS_EMBEDDED
105 # if !defined(CONFIG_ENV_IS_IN_FLASH) && \
106 !defined(CONFIG_ENV_IS_IN_NAND) && \
107 !defined(CONFIG_ENV_IS_IN_ONENAND) && \
108 !defined(CONFIG_ENV_IS_IN_SPI_FLASH)
109 # error "CONFIG_ENV_IS_EMBEDDED not supported for your flash type"
114 * For the flash types where embedded env is supported, but it cannot be
115 * calculated automatically (i.e. NAND), take the board opt-in.
117 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
118 # define ENV_IS_EMBEDDED
121 /* The build system likes to know if the env is embedded */
123 # ifdef ENV_IS_EMBEDDED
124 # ifndef CONFIG_ENV_IS_EMBEDDED
125 # define CONFIG_ENV_IS_EMBEDDED
130 #include "compiler.h"
132 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
133 # define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
135 # define ENV_HEADER_SIZE (sizeof(uint32_t))
138 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
141 * If the environment is in RAM, allocate extra space for it in the malloc
144 #if defined(CONFIG_ENV_IS_EMBEDDED)
145 #define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
146 #elif (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE < CONFIG_SYS_MONITOR_BASE) || \
147 (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN) || \
148 defined(CONFIG_ENV_IS_IN_NVRAM)
149 #define TOTAL_MALLOC_LEN (CONFIG_SYS_MALLOC_LEN + CONFIG_ENV_SIZE)
151 #define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
154 typedef struct environment_s {
155 uint32_t crc; /* CRC32 over data bytes */
156 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
157 unsigned char flags; /* active/obsolete flags ENVF_REDUND_ */
159 unsigned char data[ENV_SIZE]; /* Environment data */
162 #ifdef ENV_IS_EMBEDDED
163 extern env_t embedded_environment;
164 #endif /* ENV_IS_EMBEDDED */
166 extern const unsigned char default_environment[];
170 #include <env_attr.h>
171 #include <env_callback.h>
172 #include <env_flags.h>
193 /* value for the various operations we want to perform on the env */
195 ENVOP_GET_CHAR, /* we want to call the get_char function */
196 ENVOP_INIT, /* we want to call the init function */
197 ENVOP_LOAD, /* we want to call the load function */
198 ENVOP_SAVE, /* we want to call the save function */
199 ENVOP_ERASE, /* we want to call the erase function */
204 enum env_location location;
207 * load() - Load the environment from storage
209 * This method is optional. If not provided, no environment will be
212 * @return 0 if OK, -ve on error
217 * save() - Save the environment to storage
219 * This method is required for 'saveenv' to work.
221 * @return 0 if OK, -ve on error
226 * erase() - Erase the environment on storage
228 * This method is optional and required for 'eraseenv' to work.
230 * @return 0 if OK, -ve on error
235 * init() - Set up the initial pre-relocation environment
237 * This method is optional.
239 * @return 0 if OK, -ENOENT if no initial environment could be found,
245 /* Declare a new environment location driver */
246 #define U_BOOT_ENV_LOCATION(__name) \
247 ll_entry_declare(struct env_driver, __name, env_driver)
249 /* Declare the name of a location */
250 #ifdef CONFIG_CMD_SAVEENV
251 #define ENV_NAME(_name) .name = _name,
253 #define ENV_NAME(_name)
256 #ifdef CONFIG_CMD_SAVEENV
257 #define env_save_ptr(x) x
259 #define env_save_ptr(x) NULL
262 extern struct hsearch_data env_htab;
264 #endif /* DO_DEPS_ONLY */
266 #endif /* _ENV_INTERNAL_H_ */