2 * (C) Copyright 2000-2002
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,
27 /**************************************************************************
29 * Support for persistent environment data
31 * The "environment" is stored as a list of '\0' terminated
32 * "name=value" strings. The end of the list is marked by a double
33 * '\0'. New entries are always added at the end. Deleting an entry
34 * shifts the remaining entries to the front. Replacing an entry is a
35 * combination of deleting the old value and adding the new one.
37 * The environment is preceeded by a 32 bit CRC over the data part.
39 **************************************************************************
44 #include <environment.h>
45 #if defined(CONFIG_CMD_EDITENV)
50 #include <linux/stddef.h>
51 #include <asm/byteorder.h>
52 #if defined(CONFIG_CMD_NET)
56 DECLARE_GLOBAL_DATA_PTR;
58 #if !defined(CONFIG_ENV_IS_IN_EEPROM) && \
59 !defined(CONFIG_ENV_IS_IN_FLASH) && \
60 !defined(CONFIG_ENV_IS_IN_DATAFLASH) && \
61 !defined(CONFIG_ENV_IS_IN_MG_DISK) && \
62 !defined(CONFIG_ENV_IS_IN_NAND) && \
63 !defined(CONFIG_ENV_IS_IN_NVRAM) && \
64 !defined(CONFIG_ENV_IS_IN_ONENAND) && \
65 !defined(CONFIG_ENV_IS_IN_SPI_FLASH) && \
66 !defined(CONFIG_ENV_IS_NOWHERE)
67 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
68 SPI_FLASH|MG_DISK|NVRAM|NOWHERE}
72 #define MK_STR(x) XMK_STR(x)
74 /************************************************************************
75 ************************************************************************/
78 * Table with supported baudrates (defined in config_xyz.h)
80 static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
81 #define N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
84 * This variable is incremented on each do_setenv (), so it can
85 * be used via get_env_id() as an indication, if the environment
86 * has changed or not. So it is possible to reread an environment
87 * variable only if the environment was changed ... done so for
88 * example in NetInitLoop()
90 static int env_id = 1;
96 /************************************************************************
97 * Command interface: print one or all environment variables
101 * state 0: finish printing this string and return (matched!)
102 * state 1: no matching to be done; print everything
103 * state 2: continue searching for matched name
105 static int printenv(char *name, int state)
113 while (state && env_get_char(i) != '\0') {
114 if (state == 2 && envmatch((uchar *)name, i) >= 0)
119 buf[j++] = c = env_get_char(i++);
120 if (j == sizeof(buf) - 1) {
142 int do_printenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
148 /* print all env vars */
149 rcode = printenv(NULL, 1);
152 printf("\nEnvironment size: %d/%ld bytes\n",
153 rcode, (ulong)ENV_SIZE);
157 /* print selected env vars */
158 for (i = 1; i < argc; ++i) {
159 char *name = argv[i];
160 if (printenv(name, 2)) {
161 printf("## Error: \"%s\" not defined\n", name);
169 /************************************************************************
170 * Set a new environment variable,
171 * or replace or delete an existing one.
173 * This function will ONLY work with a in-RAM copy of the environment
176 int _do_setenv (int flag, int argc, char *argv[])
180 uchar *env, *nxt = NULL;
184 uchar *env_data = env_get_addr(0);
186 if (!env_data) /* need copy in RAM */
191 if (strchr(name, '=')) {
192 printf ("## Error: illegal character '=' in variable name \"%s\"\n", name);
198 * search if variable with this name already exists
201 for (env=env_data; *env; env=nxt+1) {
202 for (nxt=env; *nxt; ++nxt)
204 if ((oldval = envmatch((uchar *)name, env-env_data)) >= 0)
208 /* Check for console redirection */
209 if (strcmp(name,"stdin") == 0) {
211 } else if (strcmp(name,"stdout") == 0) {
213 } else if (strcmp(name,"stderr") == 0) {
218 if (argc < 3) { /* Cannot delete it! */
219 printf("Can't delete \"%s\"\n", name);
223 #ifdef CONFIG_CONSOLE_MUX
224 i = iomux_doenv(console, argv[2]);
228 /* Try assigning specified device */
229 if (console_assign (console, argv[2]) < 0)
232 #ifdef CONFIG_SERIAL_MULTI
233 if (serial_assign (argv[2]) < 0)
236 #endif /* CONFIG_CONSOLE_MUX */
240 * Delete any existing definition
243 #ifndef CONFIG_ENV_OVERWRITE
246 * Ethernet Address and serial# can be set only once,
250 #ifdef CONFIG_HAS_UID
251 /* Allow serial# forced overwrite with 0xdeaf4add flag */
252 ((strcmp (name, "serial#") == 0) && (flag != 0xdeaf4add)) ||
254 (strcmp (name, "serial#") == 0) ||
256 ((strcmp (name, "ethaddr") == 0)
257 #if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR)
258 && (strcmp ((char *)env_get_addr(oldval),MK_STR(CONFIG_ETHADDR)) != 0)
259 #endif /* CONFIG_OVERWRITE_ETHADDR_ONCE && CONFIG_ETHADDR */
261 printf ("Can't overwrite \"%s\"\n", name);
267 * Switch to new baudrate if new baudrate is supported
269 if (strcmp(argv[1],"baudrate") == 0) {
270 int baudrate = simple_strtoul(argv[2], NULL, 10);
272 for (i=0; i<N_BAUDRATES; ++i) {
273 if (baudrate == baudrate_table[i])
276 if (i == N_BAUDRATES) {
277 printf ("## Baudrate %d bps not supported\n",
281 printf ("## Switch baudrate to %d bps and press ENTER ...\n",
284 gd->baudrate = baudrate;
285 #if defined(CONFIG_PPC) || defined(CONFIG_MCF52x2)
286 gd->bd->bi_baudrate = baudrate;
297 if (*++nxt == '\0') {
298 if (env > env_data) {
306 if ((*env == '\0') && (*nxt == '\0'))
315 if ((argc < 3) || argv[2] == NULL) {
321 * Append new definition at the end
323 for (env=env_data; *env || *(env+1); ++env)
329 * "name" + "=" + "val" +"\0\0" > ENV_SIZE - (env-env_data)
331 len = strlen(name) + 2;
332 /* add '=' for first arg, ' ' for all others */
333 for (i=2; i<argc; ++i) {
334 len += strlen(argv[i]) + 1;
336 if (len > (&env_data[ENV_SIZE]-env)) {
337 printf ("## Error: environment overflow, \"%s\" deleted\n", name);
340 while ((*env = *name++) != '\0')
342 for (i=2; i<argc; ++i) {
345 *env = (i==2) ? '=' : ' ';
346 while ((*++env = *val++) != '\0')
350 /* end is marked with double '\0' */
357 * Some variables should be updated when the corresponding
358 * entry in the enviornment is changed
361 if (strcmp(argv[1],"ethaddr") == 0)
364 if (strcmp(argv[1],"ipaddr") == 0) {
365 char *s = argv[2]; /* always use only one arg */
369 for (addr=0, i=0; i<4; ++i) {
370 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
372 addr |= (val & 0xFF);
373 if (s) s = (*e) ? e+1 : e;
375 bd->bi_ip_addr = htonl(addr);
378 if (strcmp(argv[1],"loadaddr") == 0) {
379 load_addr = simple_strtoul(argv[2], NULL, 16);
382 #if defined(CONFIG_CMD_NET)
383 if (strcmp(argv[1],"bootfile") == 0) {
384 copy_filename (BootFile, argv[2], sizeof(BootFile));
391 int setenv (char *varname, char *varvalue)
393 char *argv[4] = { "setenv", varname, varvalue, NULL };
394 if ((varvalue == NULL) || (varvalue[0] == '\0'))
395 return _do_setenv (0, 2, argv);
397 return _do_setenv (0, 3, argv);
400 #ifdef CONFIG_HAS_UID
401 void forceenv (char *varname, char *varvalue)
403 char *argv[4] = { "forceenv", varname, varvalue, NULL };
404 _do_setenv (0xdeaf4add, 3, argv);
408 int do_setenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
415 return _do_setenv (flag, argc, argv);
418 /************************************************************************
419 * Prompt for environment variable
422 #if defined(CONFIG_CMD_ASKENV)
423 int do_askenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
425 extern char console_buffer[CONFIG_SYS_CBSIZE];
426 char message[CONFIG_SYS_CBSIZE];
427 int size = CONFIG_SYS_CBSIZE - 1;
431 local_args[0] = argv[0];
432 local_args[1] = argv[1];
433 local_args[2] = NULL;
434 local_args[3] = NULL;
440 /* Check the syntax */
446 case 2: /* askenv envname */
447 sprintf (message, "Please enter '%s':", argv[1]);
450 case 3: /* askenv envname size */
451 sprintf (message, "Please enter '%s':", argv[1]);
452 size = simple_strtoul (argv[2], NULL, 10);
455 default: /* askenv envname message1 ... messagen size */
460 for (i = 2; i < argc - 1; i++) {
462 message[pos++] = ' ';
464 strcpy (message+pos, argv[i]);
465 pos += strlen(argv[i]);
468 size = simple_strtoul (argv[argc - 1], NULL, 10);
473 if (size >= CONFIG_SYS_CBSIZE)
474 size = CONFIG_SYS_CBSIZE - 1;
479 /* prompt for input */
480 len = readline (message);
483 console_buffer[size] = '\0';
486 if (console_buffer[0] != '\0') {
487 local_args[2] = console_buffer;
491 /* Continue calling setenv code */
492 return _do_setenv (flag, len, local_args);
496 /************************************************************************
497 * Interactively edit an environment variable
499 #if defined(CONFIG_CMD_EDITENV)
500 int do_editenv(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
502 char buffer[CONFIG_SYS_CBSIZE];
511 /* Set read buffer to initial value or empty sting */
512 init_val = getenv(argv[1]);
514 len = sprintf(buffer, "%s", init_val);
518 readline_into_buffer("edit: ", buffer);
520 return setenv(argv[1], buffer);
522 #endif /* CONFIG_CMD_EDITENV */
524 /************************************************************************
525 * Look up variable from environment,
526 * return address of storage for that variable,
527 * or NULL if not found
530 char *getenv (char *name)
536 for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
539 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
540 if (nxt >= CONFIG_ENV_SIZE) {
544 if ((val=envmatch((uchar *)name, i)) < 0)
546 return ((char *)env_get_addr(val));
552 int getenv_r (char *name, char *buf, unsigned len)
556 for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
559 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
560 if (nxt >= CONFIG_ENV_SIZE) {
564 if ((val=envmatch((uchar *)name, i)) < 0)
566 /* found; copy out */
568 while ((len > n++) && (*buf++ = env_get_char(val++)) != '\0')
577 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
579 int do_saveenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
581 extern char * env_name_spec;
583 printf ("Saving Environment to %s...\n", env_name_spec);
585 return (saveenv() ? 1 : 0);
589 saveenv, 1, 0, do_saveenv,
590 "save environment variables to persistent storage",
597 /************************************************************************
598 * Match a name / name=value pair
600 * s1 is either a simple 'name', or a 'name=value' pair.
601 * i2 is the environment index for a 'name2=value2' pair.
602 * If the names match, return the index for the value2, else NULL.
605 int envmatch (uchar *s1, int i2)
608 while (*s1 == env_get_char(i2++))
611 if (*s1 == '\0' && env_get_char(i2-1) == '=')
617 /**************************************************/
619 #if defined(CONFIG_CMD_EDITENV)
621 editenv, 2, 0, do_editenv,
622 "edit environment variable",
624 " - edit environment variable 'name'"
629 printenv, CONFIG_SYS_MAXARGS, 1, do_printenv,
630 "print environment variables",
631 "\n - print values of all environment variables\n"
632 "printenv name ...\n"
633 " - print value of environment variable 'name'"
637 setenv, CONFIG_SYS_MAXARGS, 0, do_setenv,
638 "set environment variables",
640 " - set environment variable 'name' to 'value ...'\n"
642 " - delete environment variable 'name'"
645 #if defined(CONFIG_CMD_ASKENV)
648 askenv, CONFIG_SYS_MAXARGS, 1, do_askenv,
649 "get environment variables from stdin",
650 "name [message] [size]\n"
651 " - get environment variable 'name' from stdin (max 'size' chars)\n"
653 " - get environment variable 'name' from stdin\n"
655 " - get environment variable 'name' from stdin (max 'size' chars)\n"
656 "askenv name [message] size\n"
657 " - display 'message' string and get environment variable 'name'"
658 "from stdin (max 'size' chars)"
662 #if defined(CONFIG_CMD_RUN)
663 int do_run (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
665 run, CONFIG_SYS_MAXARGS, 1, do_run,
666 "run commands in an environment variable",
668 " - run the commands in the environment variable(s) 'var'"