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Simon Glassaf95f202019-08-01 09:46:40 -06001/* SPDX-License-Identifier: GPL-2.0+ */
2/*
Simon Glassdb197012019-08-01 09:47:04 -06003 * Common environment functions and definitions
Simon Glassaf95f202019-08-01 09:46:40 -06004 *
5 * (C) Copyright 2000-2009
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 */
8
9#ifndef __ENV_H
10#define __ENV_H
11
Pierre-Jean Texier664689f2019-08-26 13:06:17 +020012#include <compiler.h>
Simon Glassaf95f202019-08-01 09:46:40 -060013#include <stdbool.h>
Simon Glassc7694dd2019-08-01 09:46:46 -060014#include <linux/types.h>
Simon Glassaf95f202019-08-01 09:46:40 -060015
Simon Glass4e9ce8a2019-08-01 09:46:58 -060016struct environment_s;
17
Simon Glassdb197012019-08-01 09:47:04 -060018/* Value for environment validity */
19enum env_valid {
20 ENV_INVALID, /* No valid environment */
21 ENV_VALID, /* First or only environment is valid */
22 ENV_REDUND, /* Redundant environment is valid */
23};
24
Simon Glass02cf9332019-08-01 09:47:05 -060025/** enum env_op - environment callback operation */
26enum env_op {
27 env_op_create,
28 env_op_delete,
29 env_op_overwrite,
30};
31
32/** struct env_clbk_tbl - declares a new callback */
33struct env_clbk_tbl {
34 const char *name; /* Callback name */
35 int (*callback)(const char *name, const char *value, enum env_op op,
36 int flags);
37};
38
39/*
40 * Define a callback that can be associated with variables.
41 * when associated through the ".callbacks" environment variable, the callback
42 * will be executed any time the variable is inserted, overwritten, or deleted.
43 *
44 * For SPL these are silently dropped to reduce code size, since environment
45 * callbacks are not supported with SPL.
46 */
47#ifdef CONFIG_SPL_BUILD
48#define U_BOOT_ENV_CALLBACK(name, callback) \
49 static inline __maybe_unused void _u_boot_env_noop_##name(void) \
50 { \
51 (void)callback; \
52 }
53#else
54#define U_BOOT_ENV_CALLBACK(name, callback) \
55 ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \
56 {#name, callback}
57#endif
58
Simon Glassd3716dd2019-08-01 09:47:08 -060059/** enum env_redund_flags - Flags for the redundand_environment */
60enum env_redund_flags {
61 ENV_REDUND_OBSOLETE = 0,
62 ENV_REDUND_ACTIVE = 1,
63};
64
Simon Glassaf95f202019-08-01 09:46:40 -060065/**
Simon Glassf1f0ae62019-08-01 09:46:41 -060066 * env_get_id() - Gets a sequence number for the environment
67 *
68 * This value increments every time the environment changes, so can be used an
69 * an indication of this
70 *
71 * @return environment ID
72 */
73int env_get_id(void);
74
75/**
Simon Glass4bfd1f52019-08-01 09:46:43 -060076 * env_init() - Set up the pre-relocation environment
77 *
78 * This locates the environment or uses the default if nothing is available.
79 * This must be called before env_get() will work.
80 *
81 * @return 0 if OK, -ENODEV if no environment drivers are enabled
82 */
83int env_init(void);
84
85/**
Simon Glass3f989e7b2019-08-01 09:46:44 -060086 * env_relocate() - Set up the post-relocation environment
87 *
88 * This loads the environment into RAM so that it can be modified. This is
89 * called after relocation, before the environment is used
90 */
91void env_relocate(void);
92
93/**
Simon Glassb9ca02c2019-08-01 09:46:45 -060094 * env_match() - Match a name / name=value pair
95 *
96 * This is used prior to relocation for finding envrionment variables
97 *
98 * @name: A simple 'name', or a 'name=value' pair.
99 * @index: The environment index for a 'name2=value2' pair.
100 * @return index for the value if the names match, else -1.
101 */
102int env_match(unsigned char *name, int index);
103
104/**
Simon Glass7b51b572019-08-01 09:46:52 -0600105 * env_get() - Look up the value of an environment variable
106 *
107 * In U-Boot proper this can be called before relocation (which is when the
108 * environment is loaded from storage, i.e. GD_FLG_ENV_READY is 0). In that
109 * case this function calls env_get_f().
110 *
111 * @varname: Variable to look up
112 * @return value of variable, or NULL if not found
113 */
114char *env_get(const char *varname);
115
Patrice Chotard1ac2cb92019-11-25 09:07:36 +0100116/*
117 * Like env_get, but prints an error if envvar isn't defined in the
118 * environment. It always returns what env_get does, so it can be used in
119 * place of env_get without changing error handling otherwise.
120 *
121 * @varname: Variable to look up
122 * @return value of variable, or NULL if not found
123 */
124char *from_env(const char *envvar);
125
Simon Glass7b51b572019-08-01 09:46:52 -0600126/**
Simon Glass3a7d5572019-08-01 09:46:42 -0600127 * env_get_f() - Look up the value of an environment variable (early)
128 *
129 * This function is called from env_get() if the environment has not been
130 * loaded yet (GD_FLG_ENV_READY flag is 0). Some environment locations will
131 * support reading the value (slowly) and some will not.
132 *
133 * @varname: Variable to look up
134 * @return value of variable, or NULL if not found
135 */
136int env_get_f(const char *name, char *buf, unsigned int len);
137
138/**
Simon Glass6bf6dbe2019-08-01 09:46:49 -0600139 * env_get_yesno() - Read an environment variable as a boolean
140 *
141 * @return 1 if yes/true (Y/y/T/t), -1 if variable does not exist (i.e. default
142 * to true), 0 if otherwise
143 */
144int env_get_yesno(const char *var);
145
146/**
Simon Glass9fb625c2019-08-01 09:46:51 -0600147 * env_set() - set an environment variable
148 *
149 * This sets or deletes the value of an environment variable. For setting the
150 * value the variable is created if it does not already exist.
151 *
152 * @varname: Variable to adjust
153 * @value: Value to set for the variable, or NULL or "" to delete the variable
154 * @return 0 if OK, 1 on error
155 */
156int env_set(const char *varname, const char *value);
157
158/**
Simon Glass9eef56d2019-08-01 09:46:48 -0600159 * env_get_ulong() - Return an environment variable as an integer value
160 *
161 * Most U-Boot environment variables store hex values. For those which store
162 * (e.g.) base-10 integers, this function can be used to read the value.
163 *
164 * @name: Variable to look up
165 * @base: Base to use (e.g. 10 for base 10, 2 for binary)
166 * @default_val: Default value to return if no value is found
167 * @return the value found, or @default_val if none
168 */
169ulong env_get_ulong(const char *name, int base, ulong default_val);
170
171/**
Simon Glass168068f2019-08-01 09:46:47 -0600172 * env_set_ulong() - set an environment variable to an integer
173 *
174 * @varname: Variable to adjust
175 * @value: Value to set for the variable (will be converted to a string)
176 * @return 0 if OK, 1 on error
177 */
178int env_set_ulong(const char *varname, ulong value);
179
180/**
Simon Glasscdbff9f2019-08-01 09:46:50 -0600181 * env_get_hex() - Return an environment variable as a hex value
182 *
183 * Decode an environment as a hex number (it may or may not have a 0x
184 * prefix). If the environment variable cannot be found, or does not start
185 * with hex digits, the default value is returned.
186 *
187 * @varname: Variable to decode
188 * @default_val: Value to return on error
189 */
190ulong env_get_hex(const char *varname, ulong default_val);
191
192/**
Simon Glassc7694dd2019-08-01 09:46:46 -0600193 * env_set_hex() - set an environment variable to a hex value
194 *
195 * @varname: Variable to adjust
196 * @value: Value to set for the variable (will be converted to a hex string)
197 * @return 0 if OK, 1 on error
198 */
199int env_set_hex(const char *varname, ulong value);
200
201/**
202 * env_set_addr - Set an environment variable to an address in hex
203 *
204 * @varname: Environment variable to set
205 * @addr: Value to set it to
206 * @return 0 if ok, 1 on error
207 */
208static inline int env_set_addr(const char *varname, const void *addr)
209{
210 return env_set_hex(varname, (ulong)addr);
211}
212
213/**
Simon Glassaf95f202019-08-01 09:46:40 -0600214 * env_complete() - return an auto-complete for environment variables
215 *
216 * @var: partial name to auto-complete
217 * @maxv: Maximum number of matches to return
218 * @cmdv: Returns a list of possible matches
219 * @maxsz: Size of buffer to use for matches
220 * @buf: Buffer to use for matches
221 * @dollar_comp: non-zero to wrap each match in ${...}
222 * @return number of matches found (in @cmdv)
223 */
224int env_complete(char *var, int maxv, char *cmdv[], int maxsz, char *buf,
225 bool dollar_comp);
226
Simon Glassb79cf1a2019-08-01 09:46:53 -0600227/**
228 * eth_env_get_enetaddr() - Get an ethernet address from the environmnet
229 *
230 * @name: Environment variable to get (e.g. "ethaddr")
231 * @enetaddr: Place to put MAC address (6 bytes)
232 * @return 0 if OK, 1 on error
233 */
234int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr);
235
236/**
237 * eth_env_set_enetaddr() - Set an ethernet address in the environmnet
238 *
239 * @name: Environment variable to set (e.g. "ethaddr")
240 * @enetaddr: Pointer to MAC address to put into the variable (6 bytes)
241 * @return 0 if OK, 1 on error
242 */
243int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr);
244
Simon Glass03ed9182019-08-01 09:46:55 -0600245/**
246 * env_fix_drivers() - Updates envdriver as per relocation
247 */
248void env_fix_drivers(void);
249
Simon Glass0b9d8a02019-08-01 09:46:56 -0600250/**
251 * env_set_default_vars() - reset variables to their default value
252 *
253 * This resets individual variables to their value in the default environment
254 *
255 * @nvars: Number of variables to set/reset
256 * @vars: List of variables to set/reset
257 * @flags: Flags controlling matching (H_... - see search.h)
258 */
259int env_set_default_vars(int nvars, char *const vars[], int flags);
260
Simon Glass4be490a2019-08-01 09:46:57 -0600261/**
262 * env_load() - Load the environment from storage
263 *
264 * @return 0 if OK, -ve on error
265 */
266int env_load(void);
267
268/**
Patrick Delaunay0115dd32020-07-28 11:51:20 +0200269 * env_reload() - Re-Load the environment from current storage
270 *
271 * @return 0 if OK, -ve on error
272 */
273int env_reload(void);
274
275/**
Simon Glass4be490a2019-08-01 09:46:57 -0600276 * env_save() - Save the environment to storage
277 *
278 * @return 0 if OK, -ve on error
279 */
280int env_save(void);
281
282/**
283 * env_erase() - Erase the environment on storage
284 *
285 * @return 0 if OK, -ve on error
286 */
287int env_erase(void);
288
Simon Glass4e9ce8a2019-08-01 09:46:58 -0600289/**
Patrick Delaunaya97d22e2020-07-28 11:51:21 +0200290 * env_select() - Select the environment storage
291 *
292 * @return 0 if OK, -ve on error
293 */
294int env_select(const char *name);
295
296/**
Simon Glass4e9ce8a2019-08-01 09:46:58 -0600297 * env_import() - Import from a binary representation into hash table
298 *
299 * This imports the environment from a buffer. The format for each variable is
300 * var=value\0 with a double \0 at the end of the buffer.
301 *
302 * @buf: Buffer containing the environment (struct environemnt_s *)
303 * @check: non-zero to check the CRC at the start of the environment, 0 to
304 * ignore it
Marek Vasut890feec2020-07-07 20:51:35 +0200305 * @flags: Flags controlling matching (H_... - see search.h)
Simon Glass4e9ce8a2019-08-01 09:46:58 -0600306 * @return 0 if imported successfully, -ENOMSG if the CRC was bad, -EIO if
307 * something else went wrong
308 */
Marek Vasut890feec2020-07-07 20:51:35 +0200309int env_import(const char *buf, int check, int flags);
Simon Glass4e9ce8a2019-08-01 09:46:58 -0600310
311/**
312 * env_export() - Export the environment to a buffer
313 *
314 * Export from hash table into binary representation
315 *
316 * @env_out: Buffer to contain the environment (must be large enough!)
317 * @return 0 if OK, 1 on error
318 */
319int env_export(struct environment_s *env_out);
320
321/**
Heiko Schocher12295332020-10-10 10:28:04 +0200322 * env_check_redund() - check the two redundant environments
323 * and find out, which is the valid one.
324 *
325 * @buf1: First environment (struct environemnt_s *)
326 * @buf1_read_fail: 0 if buf1 is valid, non-zero if invalid
327 * @buf2: Second environment (struct environemnt_s *)
328 * @buf2_read_fail: 0 if buf2 is valid, non-zero if invalid
329 * @return 0 if OK,
330 * -EIO if no environment is valid,
Heiko Schocher12295332020-10-10 10:28:04 +0200331 * -ENOMSG if the CRC was bad
332 */
333
334int env_check_redund(const char *buf1, int buf1_read_fail,
335 const char *buf2, int buf2_read_fail);
336
337/**
Simon Glass4e9ce8a2019-08-01 09:46:58 -0600338 * env_import_redund() - Select and import one of two redundant environments
339 *
340 * @buf1: First environment (struct environemnt_s *)
341 * @buf1_read_fail: 0 if buf1 is valid, non-zero if invalid
342 * @buf2: Second environment (struct environemnt_s *)
343 * @buf2_read_fail: 0 if buf2 is valid, non-zero if invalid
Marek Vasut890feec2020-07-07 20:51:35 +0200344 * @flags: Flags controlling matching (H_... - see search.h)
Simon Glass4e9ce8a2019-08-01 09:46:58 -0600345 * @return 0 if OK, -EIO if no environment is valid, -ENOMSG if the CRC was bad
346 */
347int env_import_redund(const char *buf1, int buf1_read_fail,
Marek Vasut890feec2020-07-07 20:51:35 +0200348 const char *buf2, int buf2_read_fail,
349 int flags);
Simon Glass4e9ce8a2019-08-01 09:46:58 -0600350
Simon Glass0ac7d722019-08-01 09:47:00 -0600351/**
352 * env_get_default() - Look up a variable from the default environment
353 *
354 * @name: Variable to look up
355 * @return value if found, NULL if not found in default environment
356 */
357char *env_get_default(const char *name);
358
359/* [re]set to the default environment */
360void env_set_default(const char *s, int flags);
361
Simon Glassb5f449e2019-08-01 09:47:01 -0600362/**
363 * env_get_char() - Get a character from the early environment
364 *
365 * This reads from the pre-relocation environment
366 *
367 * @index: Index of character to read (0 = first)
368 * @return character read, or -ve on error
369 */
370int env_get_char(int index);
371
Simon Glassc62f62b2019-08-01 09:47:02 -0600372/**
373 * env_reloc() - Relocate the 'env' sub-commands
374 *
375 * This is used for those unfortunate archs with crappy toolchains
376 */
377void env_reloc(void);
Rasmus Villemoes95fd9772021-04-21 11:06:54 +0200378
379
380/**
381 * env_import_fdt() - Import environment values from device tree blob
382 *
383 * This uses the value of the environment variable "env_fdt_path" as a
384 * path to an fdt node, whose property/value pairs are added to the
385 * environment.
386 */
387#ifdef CONFIG_ENV_IMPORT_FDT
388void env_import_fdt(void);
389#else
390static inline void env_import_fdt(void) {}
391#endif
392
Simon Glassaf95f202019-08-01 09:46:40 -0600393#endif