5 * SPDX-License-Identifier: GPL-2.0+
8 #ifndef _ENVIRONMENT_H_
9 #define _ENVIRONMENT_H_
11 /**************************************************************************
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.
19 * The environment is preceded by a 32 bit CRC over the data part.
21 *************************************************************************/
23 #if defined(CONFIG_ENV_IS_IN_FLASH)
24 # ifndef CONFIG_ENV_ADDR
25 # define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
27 # ifndef CONFIG_ENV_OFFSET
28 # define CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
30 # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
31 # define CONFIG_ENV_ADDR_REDUND \
32 (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
34 # if defined(CONFIG_ENV_SECT_SIZE) || defined(CONFIG_ENV_SIZE)
35 # ifndef CONFIG_ENV_SECT_SIZE
36 # define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
38 # ifndef CONFIG_ENV_SIZE
39 # define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
42 # error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"
44 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
45 # define CONFIG_ENV_SIZE_REDUND CONFIG_ENV_SIZE
47 # if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
48 (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= \
49 (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
50 # define ENV_IS_EMBEDDED
52 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
53 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
55 # ifdef CONFIG_ENV_IS_EMBEDDED
56 # error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
57 # error "it is calculated automatically for you"
59 #endif /* CONFIG_ENV_IS_IN_FLASH */
61 #if defined(CONFIG_ENV_IS_IN_MMC)
62 # ifdef CONFIG_ENV_OFFSET_REDUND
63 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
67 #if defined(CONFIG_ENV_IS_IN_NAND)
68 # if defined(CONFIG_ENV_OFFSET_OOB)
69 # ifdef CONFIG_ENV_OFFSET_REDUND
70 # error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
73 extern unsigned long nand_env_oob_offset;
74 # define CONFIG_ENV_OFFSET nand_env_oob_offset
76 # ifndef CONFIG_ENV_OFFSET
77 # error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
79 # ifdef CONFIG_ENV_OFFSET_REDUND
80 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
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 # if defined(CONFIG_ENV_UBI_VOLUME_REDUND)
96 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
98 # ifndef CONFIG_ENV_SIZE
99 # error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
101 # ifndef CONFIG_CMD_UBI
102 # error "Need to define CONFIG_CMD_UBI when using CONFIG_ENV_IS_IN_UBI"
104 #endif /* CONFIG_ENV_IS_IN_UBI */
106 /* Embedded env is only supported for some flash types */
107 #ifdef CONFIG_ENV_IS_EMBEDDED
108 # if !defined(CONFIG_ENV_IS_IN_FLASH) && \
109 !defined(CONFIG_ENV_IS_IN_NAND) && \
110 !defined(CONFIG_ENV_IS_IN_ONENAND) && \
111 !defined(CONFIG_ENV_IS_IN_SPI_FLASH)
112 # error "CONFIG_ENV_IS_EMBEDDED not supported for your flash type"
117 * For the flash types where embedded env is supported, but it cannot be
118 * calculated automatically (i.e. NAND), take the board opt-in.
120 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
121 # define ENV_IS_EMBEDDED
124 /* The build system likes to know if the env is embedded */
126 # ifdef ENV_IS_EMBEDDED
127 # ifndef CONFIG_ENV_IS_EMBEDDED
128 # define CONFIG_ENV_IS_EMBEDDED
133 #include "compiler.h"
135 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
136 # define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
138 # define ACTIVE_FLAG 1
139 # define OBSOLETE_FLAG 0
141 # define ENV_HEADER_SIZE (sizeof(uint32_t))
144 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
145 extern char *env_name_spec;
148 #ifdef CONFIG_ENV_AES
149 /* Make sure the payload is multiple of AES block size */
150 #define ENV_SIZE ((CONFIG_ENV_SIZE - ENV_HEADER_SIZE) & ~(16 - 1))
152 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
155 typedef struct environment_s {
156 uint32_t crc; /* CRC32 over data bytes */
157 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
158 unsigned char flags; /* active/obsolete flags */
160 unsigned char data[ENV_SIZE]; /* Environment data */
162 #ifdef CONFIG_ENV_AES
163 /* Make sure the env is aligned to block size. */
164 __attribute__((aligned(16)))
168 #ifdef ENV_IS_EMBEDDED
169 extern env_t environment;
170 #endif /* ENV_IS_EMBEDDED */
172 extern const unsigned char default_environment[];
173 extern env_t *env_ptr;
175 extern void env_relocate_spec(void);
176 extern unsigned char env_get_char_spec(int);
178 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
179 extern void env_reloc(void);
182 #ifdef CONFIG_ENV_IS_IN_MMC
185 extern int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
186 # ifdef CONFIG_SYS_MMC_ENV_PART
187 extern uint mmc_get_env_part(struct mmc *mmc);
193 #include <env_attr.h>
194 #include <env_callback.h>
195 #include <env_flags.h>
198 extern struct hsearch_data env_htab;
200 /* Function that returns a character from the environment */
201 unsigned char env_get_char(int);
203 /* Function that returns a pointer to a value from the environment */
204 const unsigned char *env_get_addr(int);
205 unsigned char env_get_char_memory(int index);
207 /* Function that updates CRC of the enironment */
208 void env_crc_update(void);
210 /* Look up the variable from the default environment */
211 char *getenv_default(const char *name);
213 /* [re]set to the default environment */
214 void set_default_env(const char *s);
216 /* [re]set individual variables to their value in the default environment */
217 int set_default_vars(int nvars, char * const vars[]);
219 /* Import from binary representation into hash table */
220 int env_import(const char *buf, int check);
222 /* Export from hash table into binary representation */
223 int env_export(env_t *env_out);
225 #endif /* DO_DEPS_ONLY */
227 #endif /* _ENVIRONMENT_H_ */