1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2000-2010
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Andreas Heppel <aheppel@sysgo.de>
12 #include <environment.h>
13 #include <linux/stddef.h>
18 DECLARE_GLOBAL_DATA_PTR
;
20 /************************************************************************
21 * Default settings to be used when no valid environment is found
23 #include <env_default.h>
25 struct hsearch_data env_htab
= {
26 .change_ok
= env_flags_validate
,
30 * Read an environment variable as a boolean
31 * Return -1 if variable does not exist (default to true)
33 int env_get_yesno(const char *var
)
35 char *s
= env_get(var
);
39 return (*s
== '1' || *s
== 'y' || *s
== 'Y' || *s
== 't' || *s
== 'T') ?
44 * Look up the variable from the default environment
46 char *env_get_default(const char *name
)
49 unsigned long really_valid
= gd
->env_valid
;
50 unsigned long real_gd_flags
= gd
->flags
;
52 /* Pretend that the image is bad. */
53 gd
->flags
&= ~GD_FLG_ENV_READY
;
54 gd
->env_valid
= ENV_INVALID
;
55 ret_val
= env_get(name
);
56 gd
->env_valid
= really_valid
;
57 gd
->flags
= real_gd_flags
;
61 void set_default_env(const char *s
, int flags
)
63 if (sizeof(default_environment
) > ENV_SIZE
) {
64 puts("*** Error - default environment is too large\n\n");
69 if ((flags
& H_INTERACTIVE
) == 0) {
70 printf("*** Warning - %s, "
71 "using default environment\n\n", s
);
76 debug("Using default environment\n");
79 if (himport_r(&env_htab
, (char *)default_environment
,
80 sizeof(default_environment
), '\0', flags
, 0,
82 pr_err("## Error: Environment import failed: errno = %d\n",
85 gd
->flags
|= GD_FLG_ENV_READY
;
86 gd
->flags
|= GD_FLG_ENV_DEFAULT
;
90 /* [re]set individual variables to their value in the default environment */
91 int set_default_vars(int nvars
, char * const vars
[], int flags
)
94 * Special use-case: import from default environment
95 * (and use \0 as a separator)
98 return himport_r(&env_htab
, (const char *)default_environment
,
99 sizeof(default_environment
), '\0',
100 flags
, 0, nvars
, vars
);
104 * Check if CRC is valid and (if yes) import the environment.
105 * Note that "buf" may or may not be aligned.
107 int env_import(const char *buf
, int check
)
109 env_t
*ep
= (env_t
*)buf
;
114 memcpy(&crc
, &ep
->crc
, sizeof(crc
));
116 if (crc32(0, ep
->data
, ENV_SIZE
) != crc
) {
117 set_default_env("bad CRC", 0);
122 if (himport_r(&env_htab
, (char *)ep
->data
, ENV_SIZE
, '\0', 0, 0,
124 gd
->flags
|= GD_FLG_ENV_READY
;
128 pr_err("Cannot import environment: errno = %d\n", errno
);
130 set_default_env("import failed", 0);
135 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
136 static unsigned char env_flags
;
138 int env_import_redund(const char *buf1
, int buf1_read_fail
,
139 const char *buf2
, int buf2_read_fail
)
141 int crc1_ok
, crc2_ok
;
142 env_t
*ep
, *tmp_env1
, *tmp_env2
;
144 tmp_env1
= (env_t
*)buf1
;
145 tmp_env2
= (env_t
*)buf2
;
147 if (buf1_read_fail
&& buf2_read_fail
) {
148 puts("*** Error - No Valid Environment Area found\n");
149 } else if (buf1_read_fail
|| buf2_read_fail
) {
150 puts("*** Warning - some problems detected ");
151 puts("reading environment; recovered successfully\n");
154 if (buf1_read_fail
&& buf2_read_fail
) {
155 set_default_env("bad env area", 0);
157 } else if (!buf1_read_fail
&& buf2_read_fail
) {
158 gd
->env_valid
= ENV_VALID
;
159 return env_import((char *)tmp_env1
, 1);
160 } else if (buf1_read_fail
&& !buf2_read_fail
) {
161 gd
->env_valid
= ENV_REDUND
;
162 return env_import((char *)tmp_env2
, 1);
165 crc1_ok
= crc32(0, tmp_env1
->data
, ENV_SIZE
) ==
167 crc2_ok
= crc32(0, tmp_env2
->data
, ENV_SIZE
) ==
170 if (!crc1_ok
&& !crc2_ok
) {
171 set_default_env("bad CRC", 0);
173 } else if (crc1_ok
&& !crc2_ok
) {
174 gd
->env_valid
= ENV_VALID
;
175 } else if (!crc1_ok
&& crc2_ok
) {
176 gd
->env_valid
= ENV_REDUND
;
178 /* both ok - check serial */
179 if (tmp_env1
->flags
== 255 && tmp_env2
->flags
== 0)
180 gd
->env_valid
= ENV_REDUND
;
181 else if (tmp_env2
->flags
== 255 && tmp_env1
->flags
== 0)
182 gd
->env_valid
= ENV_VALID
;
183 else if (tmp_env1
->flags
> tmp_env2
->flags
)
184 gd
->env_valid
= ENV_VALID
;
185 else if (tmp_env2
->flags
> tmp_env1
->flags
)
186 gd
->env_valid
= ENV_REDUND
;
187 else /* flags are equal - almost impossible */
188 gd
->env_valid
= ENV_VALID
;
191 if (gd
->env_valid
== ENV_VALID
)
196 env_flags
= ep
->flags
;
197 return env_import((char *)ep
, 0);
199 #endif /* CONFIG_SYS_REDUNDAND_ENVIRONMENT */
201 /* Export the environment and generate CRC for it. */
202 int env_export(env_t
*env_out
)
207 res
= (char *)env_out
->data
;
208 len
= hexport_r(&env_htab
, '\0', 0, &res
, ENV_SIZE
, 0, NULL
);
210 pr_err("Cannot export environment: errno = %d\n", errno
);
214 env_out
->crc
= crc32(0, env_out
->data
, ENV_SIZE
);
216 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
217 env_out
->flags
= ++env_flags
; /* increase the serial */
223 void env_relocate(void)
225 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
228 env_htab
.change_ok
+= gd
->reloc_off
;
230 if (gd
->env_valid
== ENV_INVALID
) {
231 #if defined(CONFIG_ENV_IS_NOWHERE) || defined(CONFIG_SPL_BUILD)
232 /* Environment not changable */
233 set_default_env(NULL
, 0);
235 bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM
);
236 set_default_env("bad CRC", 0);
243 #if defined(CONFIG_AUTO_COMPLETE) && !defined(CONFIG_SPL_BUILD)
244 int env_complete(char *var
, int maxv
, char *cmdv
[], int bufsz
, char *buf
)
253 while ((idx
= hmatch_r(var
, idx
, &match
, &env_htab
))) {
254 int vallen
= strlen(match
->key
) + 1;
256 if (found
>= maxv
- 2 || bufsz
< vallen
)
260 memcpy(buf
, match
->key
, vallen
);
265 qsort(cmdv
, found
, sizeof(cmdv
[0]), strcmp_compar
);
268 cmdv
[found
++] = "...";