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_IN_ONENAND)     && \
  61     !defined(CFG_ENV_IS_NOWHERE)
  62 # error Define one of CFG_ENV_IS_IN_{NVRAM|EEPROM|FLASH|DATAFLASH|ONENAND|NOWHERE}
  63 #endif
  64
  65 #define XMK_STR(x)      #x
  66 #define MK_STR(x)       XMK_STR(x)
  67
  68 /************************************************************************
  69 ************************************************************************/
  70
  71 /* Function that returns a character from the environment */
  72 extern uchar (*env_get_char)(int);
  73
  74 /* Function that returns a pointer to a value from the environment */
  75 /* (Only memory version supported / needed). */
  76 extern uchar *env_get_addr(int);
  77
  78 /* Function that updates CRC of the enironment */
  79 extern void env_crc_update (void);
  80
  81 /************************************************************************
  82 ************************************************************************/
  83
  84 static int envmatch (uchar *, int);
  85
  86 /*
  87  * Table with supported baudrates (defined in config_xyz.h)
  88  */
  89 static const unsigned long baudrate_table[] = CFG_BAUDRATE_TABLE;
  90 #define N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
  91
  92
  93 /************************************************************************
  94  * Command interface: print one or all environment variables
  95  */
  96
  97 int do_printenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  98 {
  99         int i, j, k, nxt;
 100         int rcode = 0;
 101
 102         if (argc == 1) {                /* Print all env variables      */
 103                 for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 104                         for (nxt=i; env_get_char(nxt) != '\0'; ++nxt)
 105                                 ;
 106                         for (k=i; k<nxt; ++k)
 107                                 putc(env_get_char(k));
 108                         putc  ('\n');
 109
 110                         if (ctrlc()) {
 111                                 puts ("\n ** Abort\n");
 112                                 return 1;
 113                         }
 114                 }
 115
 116                 printf("\nEnvironment size: %d/%d bytes\n", i, ENV_SIZE);
 117
 118                 return 0;
 119         }
 120
 121         for (i=1; i<argc; ++i) {        /* print single env variables   */
 122                 char *name = argv[i];
 123
 124                 k = -1;
 125
 126                 for (j=0; env_get_char(j) != '\0'; j=nxt+1) {
 127
 128                         for (nxt=j; env_get_char(nxt) != '\0'; ++nxt)
 129                                 ;
 130                         k = envmatch((uchar *)name, j);
 131                         if (k < 0) {
 132                                 continue;
 133                         }
 134                         puts (name);
 135                         putc ('=');
 136                         while (k < nxt)
 137                                 putc(env_get_char(k++));
 138                         putc ('\n');
 139                         break;
 140                 }
 141                 if (k < 0) {
 142                         printf ("## Error: \"%s\" not defined\n", name);
 143                         rcode ++;
 144                 }
 145         }
 146         return rcode;
 147 }
 148
 149 /************************************************************************
 150  * Set a new environment variable,
 151  * or replace or delete an existing one.
 152  *
 153  * This function will ONLY work with a in-RAM copy of the environment
 154  */
 155
 156 int _do_setenv (int flag, int argc, char *argv[])
 157 {
 158         int   i, len, oldval;
 159         int   console = -1;
 160         uchar *env, *nxt = NULL;
 161         char *name;
 162         bd_t *bd = gd->bd;
 163
 164         uchar *env_data = env_get_addr(0);
 165
 166         if (!env_data)  /* need copy in RAM */
 167                 return 1;
 168
 169         name = argv[1];
 170
 171         if (strchr(name, '=')) {
 172                 printf ("## Error: illegal character '=' in variable name \"%s\"\n", name);
 173                 return 1;
 174         }
 175
 176         /*
 177          * search if variable with this name already exists
 178          */
 179         oldval = -1;
 180         for (env=env_data; *env; env=nxt+1) {
 181                 for (nxt=env; *nxt; ++nxt)
 182                         ;
 183                 if ((oldval = envmatch((uchar *)name, env-env_data)) >= 0)
 184                         break;
 185         }
 186
 187         /*
 188          * Delete any existing definition
 189          */
 190         if (oldval >= 0) {
 191 #ifndef CONFIG_ENV_OVERWRITE
 192
 193                 /*
 194                  * Ethernet Address and serial# can be set only once,
 195                  * ver is readonly.
 196                  */
 197 #ifdef CONFIG_HAS_UID
 198                 /* Allow serial# forced overwrite with 0xdeaf4add flag */
 199                 if ( ((strcmp (name, "serial#") == 0) && (flag != 0xdeaf4add)) ||
 200 #else
 201                 if ( (strcmp (name, "serial#") == 0) ||
 202 #endif
 203                     ((strcmp (name, "ethaddr") == 0)
 204 #if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR)
 205                      && (strcmp ((char *)env_get_addr(oldval),MK_STR(CONFIG_ETHADDR)) != 0)
 206 #endif  /* CONFIG_OVERWRITE_ETHADDR_ONCE && CONFIG_ETHADDR */
 207                     ) ) {
 208                         printf ("Can't overwrite \"%s\"\n", name);
 209                         return 1;
 210                 }
 211 #endif
 212
 213                 /* Check for console redirection */
 214                 if (strcmp(name,"stdin") == 0) {
 215                         console = stdin;
 216                 } else if (strcmp(name,"stdout") == 0) {
 217                         console = stdout;
 218                 } else if (strcmp(name,"stderr") == 0) {
 219                         console = stderr;
 220                 }
 221
 222                 if (console != -1) {
 223                         if (argc < 3) {         /* Cannot delete it! */
 224                                 printf("Can't delete \"%s\"\n", name);
 225                                 return 1;
 226                         }
 227
 228                         /* Try assigning specified device */
 229                         if (console_assign (console, argv[2]) < 0)
 230                                 return 1;
 231
 232 #ifdef CONFIG_SERIAL_MULTI
 233                         if (serial_assign (argv[2]) < 0)
 234                                 return 1;
 235 #endif
 236                 }
 237
 238                 /*
 239                  * Switch to new baudrate if new baudrate is supported
 240                  */
 241                 if (strcmp(argv[1],"baudrate") == 0) {
 242                         int baudrate = simple_strtoul(argv[2], NULL, 10);
 243                         int i;
 244                         for (i=0; i<N_BAUDRATES; ++i) {
 245                                 if (baudrate == baudrate_table[i])
 246                                         break;
 247                         }
 248                         if (i == N_BAUDRATES) {
 249                                 printf ("## Baudrate %d bps not supported\n",
 250                                         baudrate);
 251                                 return 1;
 252                         }
 253                         printf ("## Switch baudrate to %d bps and press ENTER ...\n",
 254                                 baudrate);
 255                         udelay(50000);
 256                         gd->baudrate = baudrate;
 257 #if defined(CONFIG_PPC) || defined(CONFIG_MCF52x2)
 258                         gd->bd->bi_baudrate = baudrate;
 259 #endif
 260
 261                         serial_setbrg ();
 262                         udelay(50000);
 263                         for (;;) {
 264                                 if (getc() == '\r')
 265                                       break;
 266                         }
 267                 }
 268
 269                 if (*++nxt == '\0') {
 270                         if (env > env_data) {
 271                                 env--;
 272                         } else {
 273                                 *env = '\0';
 274                         }
 275                 } else {
 276                         for (;;) {
 277                                 *env = *nxt++;
 278                                 if ((*env == '\0') && (*nxt == '\0'))
 279                                         break;
 280                                 ++env;
 281                         }
 282                 }
 283                 *++env = '\0';
 284         }
 285
 286 #ifdef CONFIG_NET_MULTI
 287         if (strncmp(name, "eth", 3) == 0) {
 288                 char *end;
 289                 int   num = simple_strtoul(name+3, &end, 10);
 290
 291                 if (strcmp(end, "addr") == 0) {
 292                         eth_set_enetaddr(num, argv[2]);
 293                 }
 294         }
 295 #endif
 296
 297
 298         /* Delete only ? */
 299         if ((argc < 3) || argv[2] == NULL) {
 300                 env_crc_update ();
 301                 return 0;
 302         }
 303
 304         /*
 305          * Append new definition at the end
 306          */
 307         for (env=env_data; *env || *(env+1); ++env)
 308                 ;
 309         if (env > env_data)
 310                 ++env;
 311         /*
 312          * Overflow when:
 313          * "name" + "=" + "val" +"\0\0"  > ENV_SIZE - (env-env_data)
 314          */
 315         len = strlen(name) + 2;
 316         /* add '=' for first arg, ' ' for all others */
 317         for (i=2; i<argc; ++i) {
 318                 len += strlen(argv[i]) + 1;
 319         }
 320         if (len > (&env_data[ENV_SIZE]-env)) {
 321                 printf ("## Error: environment overflow, \"%s\" deleted\n", name);
 322                 return 1;
 323         }
 324         while ((*env = *name++) != '\0')
 325                 env++;
 326         for (i=2; i<argc; ++i) {
 327                 char *val = argv[i];
 328
 329                 *env = (i==2) ? '=' : ' ';
 330                 while ((*++env = *val++) != '\0')
 331                         ;
 332         }
 333
 334         /* end is marked with double '\0' */
 335         *++env = '\0';
 336
 337         /* Update CRC */
 338         env_crc_update ();
 339
 340         /*
 341          * Some variables should be updated when the corresponding
 342          * entry in the enviornment is changed
 343          */
 344
 345         if (strcmp(argv[1],"ethaddr") == 0) {
 346                 char *s = argv[2];      /* always use only one arg */
 347                 char *e;
 348                 for (i=0; i<6; ++i) {
 349                         bd->bi_enetaddr[i] = s ? simple_strtoul(s, &e, 16) : 0;
 350                         if (s) s = (*e) ? e+1 : e;
 351                 }
 352 #ifdef CONFIG_NET_MULTI
 353                 eth_set_enetaddr(0, argv[2]);
 354 #endif
 355                 return 0;
 356         }
 357
 358         if (strcmp(argv[1],"ipaddr") == 0) {
 359                 char *s = argv[2];      /* always use only one arg */
 360                 char *e;
 361                 unsigned long addr;
 362                 bd->bi_ip_addr = 0;
 363                 for (addr=0, i=0; i<4; ++i) {
 364                         ulong val = s ? simple_strtoul(s, &e, 10) : 0;
 365                         addr <<= 8;
 366                         addr  |= (val & 0xFF);
 367                         if (s) s = (*e) ? e+1 : e;
 368                 }
 369                 bd->bi_ip_addr = htonl(addr);
 370                 return 0;
 371         }
 372         if (strcmp(argv[1],"loadaddr") == 0) {
 373                 load_addr = simple_strtoul(argv[2], NULL, 16);
 374                 return 0;
 375         }
 376 #if defined(CONFIG_CMD_NET)
 377         if (strcmp(argv[1],"bootfile") == 0) {
 378                 copy_filename (BootFile, argv[2], sizeof(BootFile));
 379                 return 0;
 380         }
 381 #endif
 382
 383 #ifdef CONFIG_AMIGAONEG3SE
 384         if (strcmp(argv[1], "vga_fg_color") == 0 ||
 385             strcmp(argv[1], "vga_bg_color") == 0 ) {
 386                 extern void video_set_color(unsigned char attr);
 387                 extern unsigned char video_get_attr(void);
 388
 389                 video_set_color(video_get_attr());
 390                 return 0;
 391         }
 392 #endif  /* CONFIG_AMIGAONEG3SE */
 393
 394         return 0;
 395 }
 396
 397 void setenv (char *varname, char *varvalue)
 398 {
 399         char *argv[4] = { "setenv", varname, varvalue, NULL };
 400         if (varvalue == NULL)
 401                 _do_setenv (0, 2, argv);
 402         else
 403                 _do_setenv (0, 3, argv);
 404 }
 405
 406 #ifdef CONFIG_HAS_UID
 407 void forceenv (char *varname, char *varvalue)
 408 {
 409         char *argv[4] = { "forceenv", varname, varvalue, NULL };
 410         _do_setenv (0xdeaf4add, 3, argv);
 411 }
 412 #endif
 413
 414 int do_setenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 415 {
 416         if (argc < 2) {
 417                 printf ("Usage:\n%s\n", cmdtp->usage);
 418                 return 1;
 419         }
 420
 421         return _do_setenv (flag, argc, argv);
 422 }
 423
 424 /************************************************************************
 425  * Prompt for environment variable
 426  */
 427
 428 #if defined(CONFIG_CMD_ASKENV)
 429 int do_askenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 430 {
 431         extern char console_buffer[CFG_CBSIZE];
 432         char message[CFG_CBSIZE];
 433         int size = CFG_CBSIZE - 1;
 434         int len;
 435         char *local_args[4];
 436
 437         local_args[0] = argv[0];
 438         local_args[1] = argv[1];
 439         local_args[2] = NULL;
 440         local_args[3] = NULL;
 441
 442         if (argc < 2) {
 443                 printf ("Usage:\n%s\n", cmdtp->usage);
 444                 return 1;
 445         }
 446         /* Check the syntax */
 447         switch (argc) {
 448         case 1:
 449                 printf ("Usage:\n%s\n", cmdtp->usage);
 450                 return 1;
 451
 452         case 2:         /* askenv envname */
 453                 sprintf (message, "Please enter '%s':", argv[1]);
 454                 break;
 455
 456         case 3:         /* askenv envname size */
 457                 sprintf (message, "Please enter '%s':", argv[1]);
 458                 size = simple_strtoul (argv[2], NULL, 10);
 459                 break;
 460
 461         default:        /* askenv envname message1 ... messagen size */
 462             {
 463                 int i;
 464                 int pos = 0;
 465
 466                 for (i = 2; i < argc - 1; i++) {
 467                         if (pos) {
 468                                 message[pos++] = ' ';
 469                         }
 470                         strcpy (message+pos, argv[i]);
 471                         pos += strlen(argv[i]);
 472                 }
 473                 message[pos] = '\0';
 474                 size = simple_strtoul (argv[argc - 1], NULL, 10);
 475             }
 476                 break;
 477         }
 478
 479         if (size >= CFG_CBSIZE)
 480                 size = CFG_CBSIZE - 1;
 481
 482         if (size <= 0)
 483                 return 1;
 484
 485         /* prompt for input */
 486         len = readline (message);
 487
 488         if (size < len)
 489                 console_buffer[size] = '\0';
 490
 491         len = 2;
 492         if (console_buffer[0] != '\0') {
 493                 local_args[2] = console_buffer;
 494                 len = 3;
 495         }
 496
 497         /* Continue calling setenv code */
 498         return _do_setenv (flag, len, local_args);
 499 }
 500 #endif
 501
 502 /************************************************************************
 503  * Look up variable from environment,
 504  * return address of storage for that variable,
 505  * or NULL if not found
 506  */
 507
 508 char *getenv (char *name)
 509 {
 510         int i, nxt;
 511
 512         WATCHDOG_RESET();
 513
 514         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 515                 int val;
 516
 517                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
 518                         if (nxt >= CFG_ENV_SIZE) {
 519                                 return (NULL);
 520                         }
 521                 }
 522                 if ((val=envmatch((uchar *)name, i)) < 0)
 523                         continue;
 524                 return ((char *)env_get_addr(val));
 525         }
 526
 527         return (NULL);
 528 }
 529
 530 int getenv_r (char *name, char *buf, unsigned len)
 531 {
 532         int i, nxt;
 533
 534         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 535                 int val, n;
 536
 537                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
 538                         if (nxt >= CFG_ENV_SIZE) {
 539                                 return (-1);
 540                         }
 541                 }
 542                 if ((val=envmatch((uchar *)name, i)) < 0)
 543                         continue;
 544                 /* found; copy out */
 545                 n = 0;
 546                 while ((len > n++) && (*buf++ = env_get_char(val++)) != '\0')
 547                         ;
 548                 if (len == n)
 549                         *buf = '\0';
 550                 return (n);
 551         }
 552         return (-1);
 553 }
 554
 555 #if defined(CFG_ENV_IS_IN_NVRAM) || defined(CFG_ENV_IS_IN_EEPROM) \
 556     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_FLASH)) \
 557     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND)) \
 558     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_ONENAND))
 559 int do_saveenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 560 {
 561         extern char * env_name_spec;
 562
 563         printf ("Saving Environment to %s...\n", env_name_spec);
 564
 565         return (saveenv() ? 1 : 0);
 566 }
 567
 568 #endif
 569
 570
 571 /************************************************************************
 572  * Match a name / name=value pair
 573  *
 574  * s1 is either a simple 'name', or a 'name=value' pair.
 575  * i2 is the environment index for a 'name2=value2' pair.
 576  * If the names match, return the index for the value2, else NULL.
 577  */
 578
 579 static int
 580 envmatch (uchar *s1, int i2)
 581 {
 582
 583         while (*s1 == env_get_char(i2++))
 584                 if (*s1++ == '=')
 585                         return(i2);
 586         if (*s1 == '\0' && env_get_char(i2-1) == '=')
 587                 return(i2);
 588         return(-1);
 589 }
 590
 591
 592 /**************************************************/
 593
 594 U_BOOT_CMD(
 595         printenv, CFG_MAXARGS, 1,       do_printenv,
 596         "printenv- print environment variables\n",
 597         "\n    - print values of all environment variables\n"
 598         "printenv name ...\n"
 599         "    - print value of environment variable 'name'\n"
 600 );
 601
 602 U_BOOT_CMD(
 603         setenv, CFG_MAXARGS, 0, do_setenv,
 604         "setenv  - set environment variables\n",
 605         "name value ...\n"
 606         "    - set environment variable 'name' to 'value ...'\n"
 607         "setenv name\n"
 608         "    - delete environment variable 'name'\n"
 609 );
 610
 611 #if defined(CFG_ENV_IS_IN_NVRAM) || defined(CFG_ENV_IS_IN_EEPROM) \
 612     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_FLASH)) \
 613     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND)) \
 614     || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_ONENAND))
 615 U_BOOT_CMD(
 616         saveenv, 1, 0,  do_saveenv,
 617         "saveenv - save environment variables to persistent storage\n",
 618         NULL
 619 );
 620
 621 #endif
 622
 623 #if defined(CONFIG_CMD_ASKENV)
 624
 625 U_BOOT_CMD(
 626         askenv, CFG_MAXARGS,    1,      do_askenv,
 627         "askenv  - get environment variables from stdin\n",
 628         "name [message] [size]\n"
 629         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 630         "askenv name\n"
 631         "    - get environment variable 'name' from stdin\n"
 632         "askenv name size\n"
 633         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 634         "askenv name [message] size\n"
 635         "    - display 'message' string and get environment variable 'name'"
 636         "from stdin (max 'size' chars)\n"
 637 );
 638 #endif
 639
 640 #if defined(CONFIG_CMD_RUN)
 641 int do_run (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
 642 U_BOOT_CMD(
 643         run,    CFG_MAXARGS,    1,      do_run,
 644         "run     - run commands in an environment variable\n",
 645         "var [...]\n"
 646         "    - run the commands in the environment variable(s) 'var'\n"
 647 );
 648 #endif