2 * (C) Copyright 2000-2010
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
6 * Andreas Heppel <aheppel@sysgo.de>
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <environment.h>
30 #include <linux/stddef.h>
35 DECLARE_GLOBAL_DATA_PTR
;
37 /************************************************************************
38 * Default settings to be used when no valid environment is found
40 #include <env_default.h>
42 struct hsearch_data env_htab
= {
43 .change_ok
= env_flags_validate
,
46 static uchar
__env_get_char_spec(int index
)
48 return *((uchar
*)(gd
->env_addr
+ index
));
50 uchar
env_get_char_spec(int)
51 __attribute__((weak
, alias("__env_get_char_spec")));
53 static uchar
env_get_char_init(int index
)
55 /* if crc was bad, use the default environment */
57 return env_get_char_spec(index
);
59 return default_environment
[index
];
62 uchar
env_get_char_memory(int index
)
64 return *env_get_addr(index
);
67 uchar
env_get_char(int index
)
69 /* if relocated to RAM */
70 if (gd
->flags
& GD_FLG_RELOC
)
71 return env_get_char_memory(index
);
73 return env_get_char_init(index
);
76 const uchar
*env_get_addr(int index
)
79 return (uchar
*)(gd
->env_addr
+ index
);
81 return &default_environment
[index
];
85 * Read an environment variable as a boolean
86 * Return -1 if variable does not exist (default to true)
88 int getenv_yesno(const char *var
)
90 char *s
= getenv(var
);
94 return (*s
== '1' || *s
== 'y' || *s
== 'Y' || *s
== 't' || *s
== 'T') ?
99 * Look up the variable from the default environment
101 char *getenv_default(const char *name
)
104 unsigned long really_valid
= gd
->env_valid
;
105 unsigned long real_gd_flags
= gd
->flags
;
107 /* Pretend that the image is bad. */
108 gd
->flags
&= ~GD_FLG_ENV_READY
;
110 ret_val
= getenv(name
);
111 gd
->env_valid
= really_valid
;
112 gd
->flags
= real_gd_flags
;
116 void set_default_env(const char *s
)
120 if (sizeof(default_environment
) > ENV_SIZE
) {
121 puts("*** Error - default environment is too large\n\n");
127 printf("*** Warning - %s, "
128 "using default environment\n\n",
131 flags
= H_INTERACTIVE
;
135 puts("Using default environment\n\n");
138 if (himport_r(&env_htab
, (char *)default_environment
,
139 sizeof(default_environment
), '\0', flags
,
141 error("Environment import failed: errno = %d\n", errno
);
143 gd
->flags
|= GD_FLG_ENV_READY
;
147 /* [re]set individual variables to their value in the default environment */
148 int set_default_vars(int nvars
, char * const vars
[])
151 * Special use-case: import from default environment
152 * (and use \0 as a separator)
154 return himport_r(&env_htab
, (const char *)default_environment
,
155 sizeof(default_environment
), '\0',
156 H_NOCLEAR
| H_INTERACTIVE
, nvars
, vars
);
159 #ifndef CONFIG_SPL_BUILD
161 * Check if CRC is valid and (if yes) import the environment.
162 * Note that "buf" may or may not be aligned.
164 int env_import(const char *buf
, int check
)
166 env_t
*ep
= (env_t
*)buf
;
171 memcpy(&crc
, &ep
->crc
, sizeof(crc
));
173 if (crc32(0, ep
->data
, ENV_SIZE
) != crc
) {
174 set_default_env("!bad CRC");
179 if (himport_r(&env_htab
, (char *)ep
->data
, ENV_SIZE
, '\0', 0,
181 gd
->flags
|= GD_FLG_ENV_READY
;
185 error("Cannot import environment: errno = %d\n", errno
);
187 set_default_env("!import failed");
193 void env_relocate(void)
195 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
197 env_htab
.change_ok
+= gd
->reloc_off
;
199 if (gd
->env_valid
== 0) {
200 #if defined(CONFIG_ENV_IS_NOWHERE) || defined(CONFIG_SPL_BUILD)
201 /* Environment not changable */
202 set_default_env(NULL
);
204 bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM
);
205 set_default_env("!bad CRC");
212 #if defined(CONFIG_AUTO_COMPLETE) && !defined(CONFIG_SPL_BUILD)
213 int env_complete(char *var
, int maxv
, char *cmdv
[], int bufsz
, char *buf
)
222 while ((idx
= hmatch_r(var
, idx
, &match
, &env_htab
))) {
223 int vallen
= strlen(match
->key
) + 1;
225 if (found
>= maxv
- 2 || bufsz
< vallen
)
229 memcpy(buf
, match
->key
, vallen
);
234 qsort(cmdv
, found
, sizeof(cmdv
[0]), strcmp_compar
);
237 cmdv
[found
++] = "...";