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 (CONFIG_COMMANDS & CFG_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                 if ( (strcmp (name, "serial#") == 0) ||
 197                     ((strcmp (name, "ethaddr") == 0)
 198 #if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR)
 199                      && (strcmp ((char *)env_get_addr(oldval),MK_STR(CONFIG_ETHADDR)) != 0)
 200 #endif  /* CONFIG_OVERWRITE_ETHADDR_ONCE && CONFIG_ETHADDR */
 201                     ) ) {
 202                         printf ("Can't overwrite \"%s\"\n", name);
 203                         return 1;
 204                 }
 205 #endif
 206
 207                 /* Check for console redirection */
 208                 if (strcmp(name,"stdin") == 0) {
 209                         console = stdin;
 210                 } else if (strcmp(name,"stdout") == 0) {
 211                         console = stdout;
 212                 } else if (strcmp(name,"stderr") == 0) {
 213                         console = stderr;
 214                 }
 215
 216                 if (console != -1) {
 217                         if (argc < 3) {         /* Cannot delete it! */
 218                                 printf("Can't delete \"%s\"\n", name);
 219                                 return 1;
 220                         }
 221
 222                         /* Try assigning specified device */
 223                         if (console_assign (console, argv[2]) < 0)
 224                                 return 1;
 225
 226 #ifdef CONFIG_SERIAL_MULTI
 227                         if (serial_assign (argv[2]) < 0)
 228                                 return 1;
 229 #endif
 230                 }
 231
 232                 /*
 233                  * Switch to new baudrate if new baudrate is supported
 234                  */
 235                 if (strcmp(argv[1],"baudrate") == 0) {
 236                         int baudrate = simple_strtoul(argv[2], NULL, 10);
 237                         int i;
 238                         for (i=0; i<N_BAUDRATES; ++i) {
 239                                 if (baudrate == baudrate_table[i])
 240                                         break;
 241                         }
 242                         if (i == N_BAUDRATES) {
 243                                 printf ("## Baudrate %d bps not supported\n",
 244                                         baudrate);
 245                                 return 1;
 246                         }
 247                         printf ("## Switch baudrate to %d bps and press ENTER ...\n",
 248                                 baudrate);
 249                         udelay(50000);
 250                         gd->baudrate = baudrate;
 251 #ifdef CONFIG_PPC
 252                         gd->bd->bi_baudrate = baudrate;
 253 #endif
 254
 255                         serial_setbrg ();
 256                         udelay(50000);
 257                         for (;;) {
 258                                 if (getc() == '\r')
 259                                       break;
 260                         }
 261                 }
 262
 263                 if (*++nxt == '\0') {
 264                         if (env > env_data) {
 265                                 env--;
 266                         } else {
 267                                 *env = '\0';
 268                         }
 269                 } else {
 270                         for (;;) {
 271                                 *env = *nxt++;
 272                                 if ((*env == '\0') && (*nxt == '\0'))
 273                                         break;
 274                                 ++env;
 275                         }
 276                 }
 277                 *++env = '\0';
 278         }
 279
 280 #ifdef CONFIG_NET_MULTI
 281         if (strncmp(name, "eth", 3) == 0) {
 282                 char *end;
 283                 int   num = simple_strtoul(name+3, &end, 10);
 284
 285                 if (strcmp(end, "addr") == 0) {
 286                         eth_set_enetaddr(num, argv[2]);
 287                 }
 288         }
 289 #endif
 290
 291
 292         /* Delete only ? */
 293         if ((argc < 3) || argv[2] == NULL) {
 294                 env_crc_update ();
 295                 return 0;
 296         }
 297
 298         /*
 299          * Append new definition at the end
 300          */
 301         for (env=env_data; *env || *(env+1); ++env)
 302                 ;
 303         if (env > env_data)
 304                 ++env;
 305         /*
 306          * Overflow when:
 307          * "name" + "=" + "val" +"\0\0"  > ENV_SIZE - (env-env_data)
 308          */
 309         len = strlen(name) + 2;
 310         /* add '=' for first arg, ' ' for all others */
 311         for (i=2; i<argc; ++i) {
 312                 len += strlen(argv[i]) + 1;
 313         }
 314         if (len > (&env_data[ENV_SIZE]-env)) {
 315                 printf ("## Error: environment overflow, \"%s\" deleted\n", name);
 316                 return 1;
 317         }
 318         while ((*env = *name++) != '\0')
 319                 env++;
 320         for (i=2; i<argc; ++i) {
 321                 char *val = argv[i];
 322
 323                 *env = (i==2) ? '=' : ' ';
 324                 while ((*++env = *val++) != '\0')
 325                         ;
 326         }
 327
 328         /* end is marked with double '\0' */
 329         *++env = '\0';
 330
 331         /* Update CRC */
 332         env_crc_update ();
 333
 334         /*
 335          * Some variables should be updated when the corresponding
 336          * entry in the enviornment is changed
 337          */
 338
 339         if (strcmp(argv[1],"ethaddr") == 0) {
 340                 char *s = argv[2];      /* always use only one arg */
 341                 char *e;
 342                 for (i=0; i<6; ++i) {
 343                         bd->bi_enetaddr[i] = s ? simple_strtoul(s, &e, 16) : 0;
 344                         if (s) s = (*e) ? e+1 : e;
 345                 }
 346 #ifdef CONFIG_NET_MULTI
 347                 eth_set_enetaddr(0, argv[2]);
 348 #endif
 349                 return 0;
 350         }
 351
 352         if (strcmp(argv[1],"ipaddr") == 0) {
 353                 char *s = argv[2];      /* always use only one arg */
 354                 char *e;
 355                 unsigned long addr;
 356                 bd->bi_ip_addr = 0;
 357                 for (addr=0, i=0; i<4; ++i) {
 358                         ulong val = s ? simple_strtoul(s, &e, 10) : 0;
 359                         addr <<= 8;
 360                         addr  |= (val & 0xFF);
 361                         if (s) s = (*e) ? e+1 : e;
 362                 }
 363                 bd->bi_ip_addr = htonl(addr);
 364                 return 0;
 365         }
 366         if (strcmp(argv[1],"loadaddr") == 0) {
 367                 load_addr = simple_strtoul(argv[2], NULL, 16);
 368                 return 0;
 369         }
 370 #if (CONFIG_COMMANDS & CFG_CMD_NET)
 371         if (strcmp(argv[1],"bootfile") == 0) {
 372                 copy_filename (BootFile, argv[2], sizeof(BootFile));
 373                 return 0;
 374         }
 375 #endif  /* CFG_CMD_NET */
 376
 377 #ifdef CONFIG_AMIGAONEG3SE
 378         if (strcmp(argv[1], "vga_fg_color") == 0 ||
 379             strcmp(argv[1], "vga_bg_color") == 0 ) {
 380                 extern void video_set_color(unsigned char attr);
 381                 extern unsigned char video_get_attr(void);
 382
 383                 video_set_color(video_get_attr());
 384                 return 0;
 385         }
 386 #endif  /* CONFIG_AMIGAONEG3SE */
 387
 388         return 0;
 389 }
 390
 391 void setenv (char *varname, char *varvalue)
 392 {
 393         char *argv[4] = { "setenv", varname, varvalue, NULL };
 394         _do_setenv (0, 3, argv);
 395 }
 396
 397 int do_setenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 398 {
 399         if (argc < 2) {
 400                 printf ("Usage:\n%s\n", cmdtp->usage);
 401                 return 1;
 402         }
 403
 404         return _do_setenv (flag, argc, argv);
 405 }
 406
 407 /************************************************************************
 408  * Prompt for environment variable
 409  */
 410
 411 #if (CONFIG_COMMANDS & CFG_CMD_ASKENV)
 412 int do_askenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 413 {
 414         extern char console_buffer[CFG_CBSIZE];
 415         char message[CFG_CBSIZE];
 416         int size = CFG_CBSIZE - 1;
 417         int len;
 418         char *local_args[4];
 419
 420         local_args[0] = argv[0];
 421         local_args[1] = argv[1];
 422         local_args[2] = NULL;
 423         local_args[3] = NULL;
 424
 425         if (argc < 2) {
 426                 printf ("Usage:\n%s\n", cmdtp->usage);
 427                 return 1;
 428         }
 429         /* Check the syntax */
 430         switch (argc) {
 431         case 1:
 432                 printf ("Usage:\n%s\n", cmdtp->usage);
 433                 return 1;
 434
 435         case 2:         /* askenv envname */
 436                 sprintf (message, "Please enter '%s':", argv[1]);
 437                 break;
 438
 439         case 3:         /* askenv envname size */
 440                 sprintf (message, "Please enter '%s':", argv[1]);
 441                 size = simple_strtoul (argv[2], NULL, 10);
 442                 break;
 443
 444         default:        /* askenv envname message1 ... messagen size */
 445             {
 446                 int i;
 447                 int pos = 0;
 448
 449                 for (i = 2; i < argc - 1; i++) {
 450                         if (pos) {
 451                                 message[pos++] = ' ';
 452                         }
 453                         strcpy (message+pos, argv[i]);
 454                         pos += strlen(argv[i]);
 455                 }
 456                 message[pos] = '\0';
 457                 size = simple_strtoul (argv[argc - 1], NULL, 10);
 458             }
 459                 break;
 460         }
 461
 462         if (size >= CFG_CBSIZE)
 463                 size = CFG_CBSIZE - 1;
 464
 465         if (size <= 0)
 466                 return 1;
 467
 468         /* prompt for input */
 469         len = readline (message);
 470
 471         if (size < len)
 472                 console_buffer[size] = '\0';
 473
 474         len = 2;
 475         if (console_buffer[0] != '\0') {
 476                 local_args[2] = console_buffer;
 477                 len = 3;
 478         }
 479
 480         /* Continue calling setenv code */
 481         return _do_setenv (flag, len, local_args);
 482 }
 483 #endif  /* CFG_CMD_ASKENV */
 484
 485 /************************************************************************
 486  * Look up variable from environment,
 487  * return address of storage for that variable,
 488  * or NULL if not found
 489  */
 490
 491 char *getenv (char *name)
 492 {
 493         int i, nxt;
 494
 495         WATCHDOG_RESET();
 496
 497         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 498                 int val;
 499
 500                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
 501                         if (nxt >= CFG_ENV_SIZE) {
 502                                 return (NULL);
 503                         }
 504                 }
 505                 if ((val=envmatch((uchar *)name, i)) < 0)
 506                         continue;
 507                 return ((char *)env_get_addr(val));
 508         }
 509
 510         return (NULL);
 511 }
 512
 513 int getenv_r (char *name, char *buf, unsigned len)
 514 {
 515         int i, nxt;
 516
 517         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 518                 int val, n;
 519
 520                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
 521                         if (nxt >= CFG_ENV_SIZE) {
 522                                 return (-1);
 523                         }
 524                 }
 525                 if ((val=envmatch((uchar *)name, i)) < 0)
 526                         continue;
 527                 /* found; copy out */
 528                 n = 0;
 529                 while ((len > n++) && (*buf++ = env_get_char(val++)) != '\0')
 530                         ;
 531                 if (len == n)
 532                         *buf = '\0';
 533                 return (n);
 534         }
 535         return (-1);
 536 }
 537
 538 #if defined(CFG_ENV_IS_IN_NVRAM) || defined(CFG_ENV_IS_IN_EEPROM) || \
 539     ((CONFIG_COMMANDS & (CFG_CMD_ENV|CFG_CMD_FLASH)) == \
 540       (CFG_CMD_ENV|CFG_CMD_FLASH)) || \
 541     ((CONFIG_COMMANDS & (CFG_CMD_ENV|CFG_CMD_NAND)) == \
 542       (CFG_CMD_ENV|CFG_CMD_NAND))
 543 int do_saveenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 544 {
 545         extern char * env_name_spec;
 546
 547         printf ("Saving Environment to %s...\n", env_name_spec);
 548
 549         return (saveenv() ? 1 : 0);
 550 }
 551
 552
 553 #endif
 554
 555
 556 /************************************************************************
 557  * Match a name / name=value pair
 558  *
 559  * s1 is either a simple 'name', or a 'name=value' pair.
 560  * i2 is the environment index for a 'name2=value2' pair.
 561  * If the names match, return the index for the value2, else NULL.
 562  */
 563
 564 static int
 565 envmatch (uchar *s1, int i2)
 566 {
 567
 568         while (*s1 == env_get_char(i2++))
 569                 if (*s1++ == '=')
 570                         return(i2);
 571         if (*s1 == '\0' && env_get_char(i2-1) == '=')
 572                 return(i2);
 573         return(-1);
 574 }
 575
 576
 577 /**************************************************/
 578
 579 U_BOOT_CMD(
 580         printenv, CFG_MAXARGS, 1,       do_printenv,
 581         "printenv- print environment variables\n",
 582         "\n    - print values of all environment variables\n"
 583         "printenv name ...\n"
 584         "    - print value of environment variable 'name'\n"
 585 );
 586
 587 U_BOOT_CMD(
 588         setenv, CFG_MAXARGS, 0, do_setenv,
 589         "setenv  - set environment variables\n",
 590         "name value ...\n"
 591         "    - set environment variable 'name' to 'value ...'\n"
 592         "setenv name\n"
 593         "    - delete environment variable 'name'\n"
 594 );
 595
 596 #if defined(CFG_ENV_IS_IN_NVRAM) || defined(CFG_ENV_IS_IN_EEPROM) || \
 597     ((CONFIG_COMMANDS & (CFG_CMD_ENV|CFG_CMD_FLASH)) == \
 598       (CFG_CMD_ENV|CFG_CMD_FLASH)) || \
 599     ((CONFIG_COMMANDS & (CFG_CMD_ENV|CFG_CMD_NAND)) == \
 600       (CFG_CMD_ENV|CFG_CMD_NAND))
 601 U_BOOT_CMD(
 602         saveenv, 1, 0,  do_saveenv,
 603         "saveenv - save environment variables to persistent storage\n",
 604         NULL
 605 );
 606
 607 #endif  /* CFG_CMD_ENV */
 608
 609 #if (CONFIG_COMMANDS & CFG_CMD_ASKENV)
 610
 611 U_BOOT_CMD(
 612         askenv, CFG_MAXARGS,    1,      do_askenv,
 613         "askenv  - get environment variables from stdin\n",
 614         "name [message] [size]\n"
 615         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 616         "askenv name\n"
 617         "    - get environment variable 'name' from stdin\n"
 618         "askenv name size\n"
 619         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 620         "askenv name [message] size\n"
 621         "    - display 'message' string and get environment variable 'name'"
 622         "from stdin (max 'size' chars)\n"
 623 );
 624 #endif  /* CFG_CMD_ASKENV */
 625
 626 #if (CONFIG_COMMANDS & CFG_CMD_RUN)
 627 int do_run (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
 628 U_BOOT_CMD(
 629         run,    CFG_MAXARGS,    1,      do_run,
 630         "run     - run commands in an environment variable\n",
 631         "var [...]\n"
 632         "    - run the commands in the environment variable(s) 'var'\n"
 633 );
 634 #endif  /* CFG_CMD_RUN */