1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Common environment functions and definitions
5 * (C) Copyright 2000-2009
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
13 #include <linux/types.h>
17 /* Value for environment validity */
19 ENV_INVALID, /* No valid environment */
20 ENV_VALID, /* First or only environment is valid */
21 ENV_REDUND, /* Redundant environment is valid */
25 * env_get_id() - Gets a sequence number for the environment
27 * This value increments every time the environment changes, so can be used an
28 * an indication of this
30 * @return environment ID
35 * env_init() - Set up the pre-relocation environment
37 * This locates the environment or uses the default if nothing is available.
38 * This must be called before env_get() will work.
40 * @return 0 if OK, -ENODEV if no environment drivers are enabled
45 * env_relocate() - Set up the post-relocation environment
47 * This loads the environment into RAM so that it can be modified. This is
48 * called after relocation, before the environment is used
50 void env_relocate(void);
53 * env_match() - Match a name / name=value pair
55 * This is used prior to relocation for finding envrionment variables
57 * @name: A simple 'name', or a 'name=value' pair.
58 * @index: The environment index for a 'name2=value2' pair.
59 * @return index for the value if the names match, else -1.
61 int env_match(unsigned char *name, int index);
64 * env_get() - Look up the value of an environment variable
66 * In U-Boot proper this can be called before relocation (which is when the
67 * environment is loaded from storage, i.e. GD_FLG_ENV_READY is 0). In that
68 * case this function calls env_get_f().
70 * @varname: Variable to look up
71 * @return value of variable, or NULL if not found
73 char *env_get(const char *varname);
76 * env_get_f() - Look up the value of an environment variable (early)
78 * This function is called from env_get() if the environment has not been
79 * loaded yet (GD_FLG_ENV_READY flag is 0). Some environment locations will
80 * support reading the value (slowly) and some will not.
82 * @varname: Variable to look up
83 * @return value of variable, or NULL if not found
85 int env_get_f(const char *name, char *buf, unsigned int len);
88 * env_get_yesno() - Read an environment variable as a boolean
90 * @return 1 if yes/true (Y/y/T/t), -1 if variable does not exist (i.e. default
91 * to true), 0 if otherwise
93 int env_get_yesno(const char *var);
96 * env_set() - set an environment variable
98 * This sets or deletes the value of an environment variable. For setting the
99 * value the variable is created if it does not already exist.
101 * @varname: Variable to adjust
102 * @value: Value to set for the variable, or NULL or "" to delete the variable
103 * @return 0 if OK, 1 on error
105 int env_set(const char *varname, const char *value);
108 * env_get_ulong() - Return an environment variable as an integer value
110 * Most U-Boot environment variables store hex values. For those which store
111 * (e.g.) base-10 integers, this function can be used to read the value.
113 * @name: Variable to look up
114 * @base: Base to use (e.g. 10 for base 10, 2 for binary)
115 * @default_val: Default value to return if no value is found
116 * @return the value found, or @default_val if none
118 ulong env_get_ulong(const char *name, int base, ulong default_val);
121 * env_set_ulong() - set an environment variable to an integer
123 * @varname: Variable to adjust
124 * @value: Value to set for the variable (will be converted to a string)
125 * @return 0 if OK, 1 on error
127 int env_set_ulong(const char *varname, ulong value);
130 * env_get_hex() - Return an environment variable as a hex value
132 * Decode an environment as a hex number (it may or may not have a 0x
133 * prefix). If the environment variable cannot be found, or does not start
134 * with hex digits, the default value is returned.
136 * @varname: Variable to decode
137 * @default_val: Value to return on error
139 ulong env_get_hex(const char *varname, ulong default_val);
142 * env_set_hex() - set an environment variable to a hex value
144 * @varname: Variable to adjust
145 * @value: Value to set for the variable (will be converted to a hex string)
146 * @return 0 if OK, 1 on error
148 int env_set_hex(const char *varname, ulong value);
151 * env_set_addr - Set an environment variable to an address in hex
153 * @varname: Environment variable to set
154 * @addr: Value to set it to
155 * @return 0 if ok, 1 on error
157 static inline int env_set_addr(const char *varname, const void *addr)
159 return env_set_hex(varname, (ulong)addr);
163 * env_complete() - return an auto-complete for environment variables
165 * @var: partial name to auto-complete
166 * @maxv: Maximum number of matches to return
167 * @cmdv: Returns a list of possible matches
168 * @maxsz: Size of buffer to use for matches
169 * @buf: Buffer to use for matches
170 * @dollar_comp: non-zero to wrap each match in ${...}
171 * @return number of matches found (in @cmdv)
173 int env_complete(char *var, int maxv, char *cmdv[], int maxsz, char *buf,
177 * eth_env_get_enetaddr() - Get an ethernet address from the environmnet
179 * @name: Environment variable to get (e.g. "ethaddr")
180 * @enetaddr: Place to put MAC address (6 bytes)
181 * @return 0 if OK, 1 on error
183 int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr);
186 * eth_env_set_enetaddr() - Set an ethernet address in the environmnet
188 * @name: Environment variable to set (e.g. "ethaddr")
189 * @enetaddr: Pointer to MAC address to put into the variable (6 bytes)
190 * @return 0 if OK, 1 on error
192 int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr);
195 * env_fix_drivers() - Updates envdriver as per relocation
197 void env_fix_drivers(void);
200 * env_set_default_vars() - reset variables to their default value
202 * This resets individual variables to their value in the default environment
204 * @nvars: Number of variables to set/reset
205 * @vars: List of variables to set/reset
206 * @flags: Flags controlling matching (H_... - see search.h)
208 int env_set_default_vars(int nvars, char *const vars[], int flags);
211 * env_load() - Load the environment from storage
213 * @return 0 if OK, -ve on error
218 * env_save() - Save the environment to storage
220 * @return 0 if OK, -ve on error
225 * env_erase() - Erase the environment on storage
227 * @return 0 if OK, -ve on error
232 * env_import() - Import from a binary representation into hash table
234 * This imports the environment from a buffer. The format for each variable is
235 * var=value\0 with a double \0 at the end of the buffer.
237 * @buf: Buffer containing the environment (struct environemnt_s *)
238 * @check: non-zero to check the CRC at the start of the environment, 0 to
240 * @return 0 if imported successfully, -ENOMSG if the CRC was bad, -EIO if
241 * something else went wrong
243 int env_import(const char *buf, int check);
246 * env_export() - Export the environment to a buffer
248 * Export from hash table into binary representation
250 * @env_out: Buffer to contain the environment (must be large enough!)
251 * @return 0 if OK, 1 on error
253 int env_export(struct environment_s *env_out);
256 * env_import_redund() - Select and import one of two redundant environments
258 * @buf1: First environment (struct environemnt_s *)
259 * @buf1_read_fail: 0 if buf1 is valid, non-zero if invalid
260 * @buf2: Second environment (struct environemnt_s *)
261 * @buf2_read_fail: 0 if buf2 is valid, non-zero if invalid
262 * @return 0 if OK, -EIO if no environment is valid, -ENOMSG if the CRC was bad
264 int env_import_redund(const char *buf1, int buf1_read_fail,
265 const char *buf2, int buf2_read_fail);
268 * env_get_default() - Look up a variable from the default environment
270 * @name: Variable to look up
271 * @return value if found, NULL if not found in default environment
273 char *env_get_default(const char *name);
275 /* [re]set to the default environment */
276 void env_set_default(const char *s, int flags);
279 * env_get_char() - Get a character from the early environment
281 * This reads from the pre-relocation environment
283 * @index: Index of character to read (0 = first)
284 * @return character read, or -ve on error
286 int env_get_char(int index);
289 * env_reloc() - Relocate the 'env' sub-commands
291 * This is used for those unfortunate archs with crappy toolchains
293 void env_reloc(void);