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_change_ok,
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];
84 void set_default_env(const char *s)
88 if (sizeof(default_environment) > ENV_SIZE) {
89 puts("*** Error - default environment is too large\n\n");
95 printf("*** Warning - %s, "
96 "using default environment\n\n",
99 flags = H_INTERACTIVE;
103 puts("Using default environment\n\n");
106 if (himport_r(&env_htab, (char *)default_environment,
107 sizeof(default_environment), '\0', flags,
109 error("Environment import failed: errno = %d\n", errno);
111 gd->flags |= GD_FLG_ENV_READY;
115 /* [re]set individual variables to their value in the default environment */
116 int set_default_vars(int nvars, char * const vars[])
119 * Special use-case: import from default environment
120 * (and use \0 as a separator)
122 return himport_r(&env_htab, (const char *)default_environment,
123 sizeof(default_environment), '\0',
124 H_NOCLEAR | H_INTERACTIVE, nvars, vars);
127 #ifndef CONFIG_SPL_BUILD
129 * Check if CRC is valid and (if yes) import the environment.
130 * Note that "buf" may or may not be aligned.
132 int env_import(const char *buf, int check)
134 env_t *ep = (env_t *)buf;
139 memcpy(&crc, &ep->crc, sizeof(crc));
141 if (crc32(0, ep->data, ENV_SIZE) != crc) {
142 set_default_env("!bad CRC");
147 if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0,
149 gd->flags |= GD_FLG_ENV_READY;
153 error("Cannot import environment: errno = %d\n", errno);
155 set_default_env("!import failed");
161 void env_relocate(void)
163 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
165 env_htab.change_ok += gd->reloc_off;
167 if (gd->env_valid == 0) {
168 #if defined(CONFIG_ENV_IS_NOWHERE) || defined(CONFIG_SPL_BUILD)
169 /* Environment not changable */
170 set_default_env(NULL);
172 bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM);
173 set_default_env("!bad CRC");
180 #if defined(CONFIG_AUTO_COMPLETE) && !defined(CONFIG_SPL_BUILD)
181 int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
190 while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
191 int vallen = strlen(match->key) + 1;
193 if (found >= maxv - 2 || bufsz < vallen)
197 memcpy(buf, match->key, vallen);
202 qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
205 cmdv[found++] = "...";