common/cmd_nvedit.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Andreas Heppel <aheppel@sysgo.de>
   7
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  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.
  15  *
  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.
  20  *
  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,
  24  * MA 02111-1307 USA
  25  */
  26
  27 /**************************************************************************
  28  *
  29  * Support for persistent environment data
  30  *
  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.
  36  *
  37  * The environment is preceeded by a 32 bit CRC over the data part.
  38  *
  39  **************************************************************************
  40  */
  41
  42 #include <common.h>
  43 #include <command.h>
  44 #include <environment.h>
  45 #include <watchdog.h>
  46 #include <serial.h>
  47 #include <linux/stddef.h>
  48 #include <asm/byteorder.h>
  49 #if defined(CONFIG_CMD_NET)
  50 #include <net.h>
  51 #endif
  52
  53 DECLARE_GLOBAL_DATA_PTR;
  54
  55 #if !defined(CFG_ENV_IS_IN_NVRAM)       && \
  56     !defined(CFG_ENV_IS_IN_EEPROM)      && \
  57     !defined(CFG_ENV_IS_IN_FLASH)       && \
  58     !defined(CFG_ENV_IS_IN_DATAFLASH)   && \
  59     !defined(CFG_ENV_IS_IN_NAND)        && \
  60     !defined(CFG_ENV_IS_NOWHERE)
  61 # error Define one of CFG_ENV_IS_IN_{NVRAM|EEPROM|FLASH|DATAFLASH|NOWHERE}
  62 #endif
  63
  64 #define XMK_STR(x)      #x
  65 #define MK_STR(x)       XMK_STR(x)
  66
  67 /************************************************************************
  68 ************************************************************************/
  69
  70 /* Function that returns a character from the environment */
  71 extern uchar (*env_get_char)(int);
  72
  73 /* Function that returns a pointer to a value from the environment */
  74 /* (Only memory version supported / needed). */
  75 extern uchar *env_get_addr(int);
  76
  77 /* Function that updates CRC of the enironment */
  78 extern void env_crc_update (void);
  79
  80 /************************************************************************
  81 ************************************************************************/
  82
  83 static int envmatch (uchar *, int);
  84
  85 /*
  86  * Table with supported baudrates (defined in config_xyz.h)
  87  */
  88 static const unsigned long baudrate_table[] = CFG_BAUDRATE_TABLE;
  89 #define N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
  90
  91
  92 /************************************************************************
  93  * Command interface: print one or all environment variables
  94  */
  95
  96 int do_printenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  97 {
  98         int i, j, k, nxt;
  99         int rcode = 0;
 100
 101         if (argc == 1) {                /* Print all env variables      */
 102                 for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 103                         for (nxt=i; env_get_char(nxt) != '\0'; ++nxt)
 104                                 ;
 105                         for (k=i; k<nxt; ++k)
 106                                 putc(env_get_char(k));
 107                         putc  ('\n');
 108
 109                         if (ctrlc()) {
 110                                 puts ("\n ** Abort\n");
 111                                 return 1;
 112                         }
 113                 }
 114
 115                 printf("\nEnvironment size: %d/%d bytes\n", i, ENV_SIZE);
 116
 117                 return 0;
 118         }
 119
 120         for (i=1; i<argc; ++i) {        /* print single env variables   */
 121                 char *name = argv[i];
 122
 123                 k = -1;
 124
 125                 for (j=0; env_get_char(j) != '\0'; j=nxt+1) {
 126
 127                         for (nxt=j; env_get_char(nxt) != '\0'; ++nxt)
 128                                 ;
 129                         k = envmatch((uchar *)name, j);
 130                         if (k < 0) {
 131                                 continue;
 132                         }
 133                         puts (name);
 134                         putc ('=');
 135                         while (k < nxt)
 136                                 putc(env_get_char(k++));
 137                         putc ('\n');
 138                         break;
 139                 }
 140                 if (k < 0) {
 141                         printf ("## Error: \"%s\" not defined\n", name);
 142                         rcode ++;
 143                 }
 144         }
 145         return rcode;
 146 }
 147
 148 /************************************************************************
 149  * Set a new environment variable,
 150  * or replace or delete an existing one.
 151  *
 152  * This function will ONLY work with a in-RAM copy of the environment
 153  */
 154
 155 int _do_setenv (int flag, int argc, char *argv[])
 156 {
 157         int   i, len, oldval;
 158         int   console = -1;
 159         uchar *env, *nxt = NULL;
 160         char *name;
 161         bd_t *bd = gd->bd;
 162
 163         uchar *env_data = env_get_addr(0);
 164
 165         if (!env_data)  /* need copy in RAM */
 166                 return 1;
 167
 168         name = argv[1];
 169
 170         if (strchr(name, '=')) {
 171                 printf ("## Error: illegal character '=' in variable name \"%s\"\n", name);
 172                 return 1;
 173         }
 174
 175         /*
 176          * search if variable with this name already exists
 177          */
 178         oldval = -1;
 179         for (env=env_data; *env; env=nxt+1) {
 180                 for (nxt=env; *nxt; ++nxt)
 181                         ;
 182                 if ((oldval = envmatch((uchar *)name, env-env_data)) >= 0)
 183                         break;
 184         }
 185
 186         /*
 187          * Delete any existing definition
 188          */
 189         if (oldval >= 0) {
 190 #ifndef CONFIG_ENV_OVERWRITE
 191
 192                 /*
 193                  * Ethernet Address and serial# can be set only once,
 194                  * ver is readonly.
 195                  */
 196 #ifdef CONFIG_HAS_UID
 197                 /* Allow serial# forced overwrite with 0xdeaf4add flag */
 198                 if ( ((strcmp (name, "serial#") == 0) && (flag != 0xdeaf4add)) ||
 199 #else
 200                 if ( (strcmp (name, "serial#") == 0) ||
 201 #endif
 202                     ((strcmp (name, "ethaddr") == 0)
 203 #if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR)
 204                      && (strcmp ((char *)env_get_addr(oldval),MK_STR(CONFIG_ETHADDR)) != 0)
 205 #endif  /* CONFIG_OVERWRITE_ETHADDR_ONCE && CONFIG_ETHADDR */
 206                     ) ) {
 207                         printf ("Can't overwrite \"%s\"\n", name);
 208                         return 1;
 209                 }
 210 #endif
 211
 212                 /* Check for console redirection */
 213                 if (strcmp(name,"stdin") == 0) {
 214                         console = stdin;
 215                 } else if (strcmp(name,"stdout") == 0) {
 216                         console = stdout;
 217                 } else if (strcmp(name,"stderr") == 0) {
 218                         console = stderr;
 219                 }
 220
 221                 if (console != -1) {
 222                         if (argc < 3) {         /* Cannot delete it! */
 223                                 printf("Can't delete \"%s\"\n", name);
 224                                 return 1;
 225                         }
 226
 227                         /* Try assigning specified device */
 228                         if (console_assign (console, argv[2]) < 0)
 229                                 return 1;
 230
 231 #ifdef CONFIG_SERIAL_MULTI
 232                         if (serial_assign (argv[2]) < 0)
 233                                 return 1;
 234 #endif
 235                 }
 236
 237                 /*
 238                  * Switch to new baudrate if new baudrate is supported
 239                  */
 240                 if (strcmp(argv[1],"baudrate") == 0) {
 241                         int baudrate = simple_strtoul(argv[2], NULL, 10);
 242                         int i;
 243                         for (i=0; i<N_BAUDRATES; ++i) {
 244                                 if (baudrate == baudrate_table[i])
 245                                         break;
 246                         }
 247                         if (i == N_BAUDRATES) {
 248                                 printf ("## Baudrate %d bps not supported\n",
 249                                         baudrate);
 250                                 return 1;
 251                         }
 252                         printf ("## Switch baudrate to %d bps and press ENTER ...\n",
 253                                 baudrate);
 254                         udelay(50000);
 255                         gd->baudrate = baudrate;
 256 #if defined(CONFIG_PPC) || defined(CONFIG_MCF52x2)
 257                         gd->bd->bi_baudrate = baudrate;
 258 #endif
 259
 260                         serial_setbrg ();
 261                         udelay(50000);
 262                         for (;;) {
 263                                 if (getc() == '\r')
 264                                       break;
 265                         }
 266                 }
 267
 268                 if (*++nxt == '\0') {
 269                         if (env > env_data) {
 270                                 env--;
 271                         } else {
 272                                 *env = '\0';
 273                         }
 274                 } else {
 275                         for (;;) {
 276                                 *env = *nxt++;
 277                                 if ((*env == '\0') && (*nxt == '\0'))
 278                                         break;
 279                                 ++env;
 280                         }
 281                 }
 282                 *++env = '\0';
 283         }
 284
 285 #ifdef CONFIG_NET_MULTI
 286         if (strncmp(name, "eth", 3) == 0) {
 287                 char *end;
 288                 int   num = simple_strtoul(name+3, &end, 10);
 289
 290                 if (strcmp(end, "addr") == 0) {
 291                         eth_set_enetaddr(num, argv[2]);
 292                 }
 293         }
 294 #endif
 295
 296
 297         /* Delete only ? */
 298         if ((argc < 3) || argv[2] == NULL) {
 299                 env_crc_update ();
 300                 return 0;
 301         }
 302
 303         /*
 304          * Append new definition at the end
 305          */
 306         for (env=env_data; *env || *(env+1); ++env)
 307                 ;
 308         if (env > env_data)
 309                 ++env;
 310         /*
 311          * Overflow when:
 312          * "name" + "=" + "val" +"\0\0"  > ENV_SIZE - (env-env_data)
 313          */
 314         len = strlen(name) + 2;
 315         /* add '=' for first arg, ' ' for all others */
 316         for (i=2; i<argc; ++i) {
 317                 len += strlen(argv[i]) + 1;
 318         }
 319         if (len > (&env_data[ENV_SIZE]-env)) {
 320                 printf ("## Error: environment overflow, \"%s\" deleted\n", name);
 321                 return 1;
 322         }
 323         while ((*env = *name++) != '\0')
 324                 env++;
 325         for (i=2; i<argc; ++i) {
 326                 char *val = argv[i];
 327
 328                 *env = (i==2) ? '=' : ' ';
 329                 while ((*++env = *val++) != '\0')
 330                         ;
 331         }
 332
 333         /* end is marked with double '\0' */
 334         *++env = '\0';
 335
 336         /* Update CRC */
 337         env_crc_update ();
 338
 339         /*
 340          * Some variables should be updated when the corresponding
 341          * entry in the enviornment is changed
 342          */
 343
 344         if (strcmp(argv[1],"ethaddr") == 0) {
 345                 char *s = argv[2];      /* always use only one arg */
 346                 char *e;
 347                 for (i=0; i<6; ++i) {
 348                         bd->bi_enetaddr[i] = s ? simple_strtoul(s, &e, 16) : 0;
 349                         if (s) s = (*e) ? e+1 : e;
 350                 }
 351 #ifdef CONFIG_NET_MULTI
 352                 eth_set_enetaddr(0, argv[2]);
 353 #endif
 354                 return 0;
 355         }
 356
 357         if (strcmp(argv[1],"ipaddr") == 0) {
 358                 char *s = argv[2];      /* always use only one arg */
 359                 char *e;
 360                 unsigned long addr;
 361                 bd->bi_ip_addr = 0;
 362                 for (addr=0, i=0; i<4; ++i) {
 363                         ulong val = s ? simple_strtoul(s, &e, 10) : 0;
 364                         addr <<= 8;
 365                         addr  |= (val & 0xFF);
 366                         if (s) s = (*e) ? e+1 : e;
 367                 }
 368                 bd->bi_ip_addr = htonl(addr);
 369                 return 0;
 370         }
 371         if (strcmp(argv[1],"loadaddr") == 0) {
 372                 load_addr = simple_strtoul(argv[2], NULL, 16);
 373                 return 0;
 374         }
 375 #if defined(CONFIG_CMD_NET)
 376         if (strcmp(argv[1],"bootfile") == 0) {
 377                 copy_filename (BootFile, argv[2], sizeof(BootFile));
 378                 return 0;
 379         }
 380 #endif
 381
 382 #ifdef CONFIG_AMIGAONEG3SE
 383         if (strcmp(argv[1], "vga_fg_color") == 0 ||
 384             strcmp(argv[1], "vga_bg_color") == 0 ) {
 385                 extern void video_set_color(unsigned char attr);
 386                 extern unsigned char video_get_attr(void);
 387
 388                 video_set_color(video_get_attr());
 389                 return 0;
 390         }
 391 #endif  /* CONFIG_AMIGAONEG3SE */
 392
 393         return 0;
 394 }
 395
 396 void setenv (char *varname, char *varvalue)
 397 {
 398         char *argv[4] = { "setenv", varname, varvalue, NULL };
 399         if (varvalue == NULL)
 400                 _do_setenv (0, 2, argv);
 401         else
 402                 _do_setenv (0, 3, argv);
 403 }
 404
 405 #ifdef CONFIG_HAS_UID
 406 void forceenv (char *varname, char *varvalue)
 407 {
 408         char *argv[4] = { "forceenv", varname, varvalue, NULL };
 409         _do_setenv (0xdeaf4add, 3, argv);
 410 }
 411 #endif
 412
 413 int do_setenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 414 {
 415         if (argc < 2) {
 416                 printf ("Usage:\n%s\n", cmdtp->usage);
 417                 return 1;
 418         }
 419
 420         return _do_setenv (flag, argc, argv);
 421 }
 422
 423 /************************************************************************
 424  * Prompt for environment variable
 425  */
 426
 427 #if defined(CONFIG_CMD_ASKENV)
 428 int do_askenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 429 {
 430         extern char console_buffer[CFG_CBSIZE];
 431         char message[CFG_CBSIZE];
 432         int size = CFG_CBSIZE - 1;
 433         int len;
 434         char *local_args[4];
 435
 436         local_args[0] = argv[0];
 437         local_args[1] = argv[1];
 438         local_args[2] = NULL;
 439         local_args[3] = NULL;
 440
 441         if (argc < 2) {
 442                 printf ("Usage:\n%s\n", cmdtp->usage);
 443                 return 1;
 444         }
 445         /* Check the syntax */
 446         switch (argc) {
 447         case 1:
 448                 printf ("Usage:\n%s\n", cmdtp->usage);
 449                 return 1;
 450
 451         case 2:         /* askenv envname */
 452                 sprintf (message, "Please enter '%s':", argv[1]);
 453                 break;
 454
 455         case 3:         /* askenv envname size */
 456                 sprintf (message, "Please enter '%s':", argv[1]);
 457                 size = simple_strtoul (argv[2], NULL, 10);
 458                 break;
 459
 460         default:        /* askenv envname message1 ... messagen size */
 461             {
 462                 int i;
 463                 int pos = 0;
 464
 465                 for (i = 2; i < argc - 1; i++) {
 466                         if (pos) {
 467                                 message[pos++] = ' ';
 468                         }
 469                         strcpy (message+pos, argv[i]);
 470                         pos += strlen(argv[i]);
 471                 }
 472                 message[pos] = '\0';
 473                 size = simple_strtoul (argv[argc - 1], NULL, 10);
 474             }
 475                 break;
 476         }
 477
 478         if (size >= CFG_CBSIZE)
 479                 size = CFG_CBSIZE - 1;
 480
 481         if (size <= 0)
 482                 return 1;
 483
 484         /* prompt for input */
 485         len = readline (message);
 486
 487         if (size < len)
 488                 console_buffer[size] = '\0';
 489
 490         len = 2;
 491         if (console_buffer[0] != '\0') {
 492                 local_args[2] = console_buffer;
 493                 len = 3;
 494         }
 495
 496         /* Continue calling setenv code */
 497         return _do_setenv (flag, len, local_args);
 498 }
 499 #endif
 500
 501 /************************************************************************
 502  * Look up variable from environment,
 503  * return address of storage for that variable,
 504  * or NULL if not found
 505  */
 506
 507 char *getenv (char *name)
 508 {
 509         int i, nxt;
 510
 511         WATCHDOG_RESET();
 512
 513         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 514                 int val;
 515
 516                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
 517                         if (nxt >= CFG_ENV_SIZE) {
 518                                 return (NULL);
 519                         }
 520                 }
 521                 if ((val=envmatch((uchar *)name, i)) < 0)
 522                         continue;
 523                 return ((char *)env_get_addr(val));
 524         }
 525
 526         return (NULL);
 527 }
 528
 529 int getenv_r (char *name, char *buf, unsigned len)
 530 {
 531         int i, nxt;
 532
 533         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 534                 int val, n;
 535
 536                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
 537                         if (nxt >= CFG_ENV_SIZE) {
 538                                 return (-1);
 539                         }
 540                 }
 541                 if ((val=envmatch((uchar *)name, i)) < 0)
 542                         continue;
 543                 /* found; copy out */
 544                 n = 0;
 545                 while ((len > n++) && (*buf++ = env_get_char(val++)) != '\0')
 546                         ;
 547                 if (len == n)
 548                         *buf = '\0';
 549                 return (n);
 550         }
 551         return (-1);
 552 }
 553
 554 #if defined(CFG_ENV_IS_IN_NVRAM) || defined(CFG_ENV_IS_IN_EEPROM) \
 555     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_FLASH)) \
 556     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND))
 557 int do_saveenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 558 {
 559         extern char * env_name_spec;
 560
 561         printf ("Saving Environment to %s...\n", env_name_spec);
 562
 563         return (saveenv() ? 1 : 0);
 564 }
 565
 566 #endif
 567
 568
 569 /************************************************************************
 570  * Match a name / name=value pair
 571  *
 572  * s1 is either a simple 'name', or a 'name=value' pair.
 573  * i2 is the environment index for a 'name2=value2' pair.
 574  * If the names match, return the index for the value2, else NULL.
 575  */
 576
 577 static int
 578 envmatch (uchar *s1, int i2)
 579 {
 580
 581         while (*s1 == env_get_char(i2++))
 582                 if (*s1++ == '=')
 583                         return(i2);
 584         if (*s1 == '\0' && env_get_char(i2-1) == '=')
 585                 return(i2);
 586         return(-1);
 587 }
 588
 589
 590 /**************************************************/
 591
 592 U_BOOT_CMD(
 593         printenv, CFG_MAXARGS, 1,       do_printenv,
 594         "printenv- print environment variables\n",
 595         "\n    - print values of all environment variables\n"
 596         "printenv name ...\n"
 597         "    - print value of environment variable 'name'\n"
 598 );
 599
 600 U_BOOT_CMD(
 601         setenv, CFG_MAXARGS, 0, do_setenv,
 602         "setenv  - set environment variables\n",
 603         "name value ...\n"
 604         "    - set environment variable 'name' to 'value ...'\n"
 605         "setenv name\n"
 606         "    - delete environment variable 'name'\n"
 607 );
 608
 609 #if defined(CFG_ENV_IS_IN_NVRAM) || defined(CFG_ENV_IS_IN_EEPROM) \
 610     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_FLASH)) \
 611     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND))
 612 U_BOOT_CMD(
 613         saveenv, 1, 0,  do_saveenv,
 614         "saveenv - save environment variables to persistent storage\n",
 615         NULL
 616 );
 617
 618 #endif
 619
 620 #if defined(CONFIG_CMD_ASKENV)
 621
 622 U_BOOT_CMD(
 623         askenv, CFG_MAXARGS,    1,      do_askenv,
 624         "askenv  - get environment variables from stdin\n",
 625         "name [message] [size]\n"
 626         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 627         "askenv name\n"
 628         "    - get environment variable 'name' from stdin\n"
 629         "askenv name size\n"
 630         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 631         "askenv name [message] size\n"
 632         "    - display 'message' string and get environment variable 'name'"
 633         "from stdin (max 'size' chars)\n"
 634 );
 635 #endif
 636
 637 #if defined(CONFIG_CMD_RUN)
 638 int do_run (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
 639 U_BOOT_CMD(
 640         run,    CFG_MAXARGS,    1,      do_run,
 641         "run     - run commands in an environment variable\n",
 642         "var [...]\n"
 643         "    - run the commands in the environment variable(s) 'var'\n"
 644 );
 645 #endif