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(CONFIG_ENV_IS_IN_EEPROM)   && \
  56     !defined(CONFIG_ENV_IS_IN_FLASH)    && \
  57     !defined(CONFIG_ENV_IS_IN_DATAFLASH)        && \
  58     !defined(CONFIG_ENV_IS_IN_MG_DISK)  && \
  59     !defined(CONFIG_ENV_IS_IN_NAND)     && \
  60     !defined(CONFIG_ENV_IS_IN_NVRAM)    && \
  61     !defined(CONFIG_ENV_IS_IN_ONENAND)  && \
  62     !defined(CONFIG_ENV_IS_IN_SPI_FLASH)        && \
  63     !defined(CONFIG_ENV_IS_NOWHERE)
  64 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
  65 SPI_FLASH|MG_DISK|NVRAM|NOWHERE}
  66 #endif
  67
  68 #define XMK_STR(x)      #x
  69 #define MK_STR(x)       XMK_STR(x)
  70
  71 /************************************************************************
  72 ************************************************************************/
  73
  74 /*
  75  * Table with supported baudrates (defined in config_xyz.h)
  76  */
  77 static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
  78 #define N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
  79
  80 /*
  81  * This variable is incremented on each do_setenv (), so it can
  82  * be used via get_env_id() as an indication, if the environment
  83  * has changed or not. So it is possible to reread an environment
  84  * variable only if the environment was changed ... done so for
  85  * example in NetInitLoop()
  86  */
  87 static int env_id = 1;
  88
  89 int get_env_id (void)
  90 {
  91         return env_id;
  92 }
  93 /************************************************************************
  94  * Command interface: print one or all environment variables
  95  */
  96
  97 /*
  98  * state 0: finish printing this string and return (matched!)
  99  * state 1: no matching to be done; print everything
 100  * state 2: continue searching for matched name
 101  */
 102 static int printenv(char *name, int state)
 103 {
 104         int i, j;
 105         char c, buf[17];
 106
 107         i = 0;
 108         buf[16] = '\0';
 109
 110         while (state && env_get_char(i) != '\0') {
 111                 if (state == 2 && envmatch((uchar *)name, i) >= 0)
 112                         state = 0;
 113
 114                 j = 0;
 115                 do {
 116                         buf[j++] = c = env_get_char(i++);
 117                         if (j == sizeof(buf) - 1) {
 118                                 if (state <= 1)
 119                                         puts(buf);
 120                                 j = 0;
 121                         }
 122                 } while (c != '\0');
 123
 124                 if (state <= 1) {
 125                         if (j)
 126                                 puts(buf);
 127                         putc('\n');
 128                 }
 129
 130                 if (ctrlc())
 131                         return -1;
 132         }
 133
 134         if (state == 0)
 135                 i = 0;
 136         return i;
 137 }
 138
 139 int do_printenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 140 {
 141         int i;
 142         int rcode = 0;
 143
 144         if (argc == 1) {
 145                 /* print all env vars */
 146                 rcode = printenv(NULL, 1);
 147                 if (rcode < 0)
 148                         return 1;
 149                 printf("\nEnvironment size: %d/%ld bytes\n",
 150                         rcode, (ulong)ENV_SIZE);
 151                 return 0;
 152         }
 153
 154         /* print selected env vars */
 155         for (i = 1; i < argc; ++i) {
 156                 char *name = argv[i];
 157                 if (printenv(name, 2)) {
 158                         printf("## Error: \"%s\" not defined\n", name);
 159                         ++rcode;
 160                 }
 161         }
 162
 163         return rcode;
 164 }
 165
 166 /************************************************************************
 167  * Set a new environment variable,
 168  * or replace or delete an existing one.
 169  *
 170  * This function will ONLY work with a in-RAM copy of the environment
 171  */
 172
 173 int _do_setenv (int flag, int argc, char *argv[])
 174 {
 175         int   i, len, oldval;
 176         int   console = -1;
 177         uchar *env, *nxt = NULL;
 178         char *name;
 179         bd_t *bd = gd->bd;
 180
 181         uchar *env_data = env_get_addr(0);
 182
 183         if (!env_data)  /* need copy in RAM */
 184                 return 1;
 185
 186         name = argv[1];
 187
 188         if (strchr(name, '=')) {
 189                 printf ("## Error: illegal character '=' in variable name \"%s\"\n", name);
 190                 return 1;
 191         }
 192
 193         env_id++;
 194         /*
 195          * search if variable with this name already exists
 196          */
 197         oldval = -1;
 198         for (env=env_data; *env; env=nxt+1) {
 199                 for (nxt=env; *nxt; ++nxt)
 200                         ;
 201                 if ((oldval = envmatch((uchar *)name, env-env_data)) >= 0)
 202                         break;
 203         }
 204
 205         /*
 206          * Delete any existing definition
 207          */
 208         if (oldval >= 0) {
 209 #ifndef CONFIG_ENV_OVERWRITE
 210
 211                 /*
 212                  * Ethernet Address and serial# can be set only once,
 213                  * ver is readonly.
 214                  */
 215                 if (
 216 #ifdef CONFIG_HAS_UID
 217                 /* Allow serial# forced overwrite with 0xdeaf4add flag */
 218                     ((strcmp (name, "serial#") == 0) && (flag != 0xdeaf4add)) ||
 219 #else
 220                     (strcmp (name, "serial#") == 0) ||
 221 #endif
 222                     ((strcmp (name, "ethaddr") == 0)
 223 #if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR)
 224                      && (strcmp ((char *)env_get_addr(oldval),MK_STR(CONFIG_ETHADDR)) != 0)
 225 #endif  /* CONFIG_OVERWRITE_ETHADDR_ONCE && CONFIG_ETHADDR */
 226                     ) ) {
 227                         printf ("Can't overwrite \"%s\"\n", name);
 228                         return 1;
 229                 }
 230 #endif
 231
 232                 /* Check for console redirection */
 233                 if (strcmp(name,"stdin") == 0) {
 234                         console = stdin;
 235                 } else if (strcmp(name,"stdout") == 0) {
 236                         console = stdout;
 237                 } else if (strcmp(name,"stderr") == 0) {
 238                         console = stderr;
 239                 }
 240
 241                 if (console != -1) {
 242                         if (argc < 3) {         /* Cannot delete it! */
 243                                 printf("Can't delete \"%s\"\n", name);
 244                                 return 1;
 245                         }
 246
 247 #ifdef CONFIG_CONSOLE_MUX
 248                         i = iomux_doenv(console, argv[2]);
 249                         if (i)
 250                                 return i;
 251 #else
 252                         /* Try assigning specified device */
 253                         if (console_assign (console, argv[2]) < 0)
 254                                 return 1;
 255
 256 #ifdef CONFIG_SERIAL_MULTI
 257                         if (serial_assign (argv[2]) < 0)
 258                                 return 1;
 259 #endif
 260 #endif /* CONFIG_CONSOLE_MUX */
 261                 }
 262
 263                 /*
 264                  * Switch to new baudrate if new baudrate is supported
 265                  */
 266                 if (strcmp(argv[1],"baudrate") == 0) {
 267                         int baudrate = simple_strtoul(argv[2], NULL, 10);
 268                         int i;
 269                         for (i=0; i<N_BAUDRATES; ++i) {
 270                                 if (baudrate == baudrate_table[i])
 271                                         break;
 272                         }
 273                         if (i == N_BAUDRATES) {
 274                                 printf ("## Baudrate %d bps not supported\n",
 275                                         baudrate);
 276                                 return 1;
 277                         }
 278                         printf ("## Switch baudrate to %d bps and press ENTER ...\n",
 279                                 baudrate);
 280                         udelay(50000);
 281                         gd->baudrate = baudrate;
 282 #if defined(CONFIG_PPC) || defined(CONFIG_MCF52x2)
 283                         gd->bd->bi_baudrate = baudrate;
 284 #endif
 285
 286                         serial_setbrg ();
 287                         udelay(50000);
 288                         for (;;) {
 289                                 if (getc() == '\r')
 290                                       break;
 291                         }
 292                 }
 293
 294                 if (*++nxt == '\0') {
 295                         if (env > env_data) {
 296                                 env--;
 297                         } else {
 298                                 *env = '\0';
 299                         }
 300                 } else {
 301                         for (;;) {
 302                                 *env = *nxt++;
 303                                 if ((*env == '\0') && (*nxt == '\0'))
 304                                         break;
 305                                 ++env;
 306                         }
 307                 }
 308                 *++env = '\0';
 309         }
 310
 311         /* Delete only ? */
 312         if ((argc < 3) || argv[2] == NULL) {
 313                 env_crc_update ();
 314                 return 0;
 315         }
 316
 317         /*
 318          * Append new definition at the end
 319          */
 320         for (env=env_data; *env || *(env+1); ++env)
 321                 ;
 322         if (env > env_data)
 323                 ++env;
 324         /*
 325          * Overflow when:
 326          * "name" + "=" + "val" +"\0\0"  > ENV_SIZE - (env-env_data)
 327          */
 328         len = strlen(name) + 2;
 329         /* add '=' for first arg, ' ' for all others */
 330         for (i=2; i<argc; ++i) {
 331                 len += strlen(argv[i]) + 1;
 332         }
 333         if (len > (&env_data[ENV_SIZE]-env)) {
 334                 printf ("## Error: environment overflow, \"%s\" deleted\n", name);
 335                 return 1;
 336         }
 337         while ((*env = *name++) != '\0')
 338                 env++;
 339         for (i=2; i<argc; ++i) {
 340                 char *val = argv[i];
 341
 342                 *env = (i==2) ? '=' : ' ';
 343                 while ((*++env = *val++) != '\0')
 344                         ;
 345         }
 346
 347         /* end is marked with double '\0' */
 348         *++env = '\0';
 349
 350         /* Update CRC */
 351         env_crc_update ();
 352
 353         /*
 354          * Some variables should be updated when the corresponding
 355          * entry in the enviornment is changed
 356          */
 357
 358         if (strcmp(argv[1],"ethaddr") == 0)
 359                 return 0;
 360
 361         if (strcmp(argv[1],"ipaddr") == 0) {
 362                 char *s = argv[2];      /* always use only one arg */
 363                 char *e;
 364                 unsigned long addr;
 365                 bd->bi_ip_addr = 0;
 366                 for (addr=0, i=0; i<4; ++i) {
 367                         ulong val = s ? simple_strtoul(s, &e, 10) : 0;
 368                         addr <<= 8;
 369                         addr  |= (val & 0xFF);
 370                         if (s) s = (*e) ? e+1 : e;
 371                 }
 372                 bd->bi_ip_addr = htonl(addr);
 373                 return 0;
 374         }
 375         if (strcmp(argv[1],"loadaddr") == 0) {
 376                 load_addr = simple_strtoul(argv[2], NULL, 16);
 377                 return 0;
 378         }
 379 #if defined(CONFIG_CMD_NET)
 380         if (strcmp(argv[1],"bootfile") == 0) {
 381                 copy_filename (BootFile, argv[2], sizeof(BootFile));
 382                 return 0;
 383         }
 384 #endif
 385
 386 #ifdef CONFIG_AMIGAONEG3SE
 387         if (strcmp(argv[1], "vga_fg_color") == 0 ||
 388             strcmp(argv[1], "vga_bg_color") == 0 ) {
 389                 extern void video_set_color(unsigned char attr);
 390                 extern unsigned char video_get_attr(void);
 391
 392                 video_set_color(video_get_attr());
 393                 return 0;
 394         }
 395 #endif  /* CONFIG_AMIGAONEG3SE */
 396
 397         return 0;
 398 }
 399
 400 int setenv (char *varname, char *varvalue)
 401 {
 402         char *argv[4] = { "setenv", varname, varvalue, NULL };
 403         if (varvalue == NULL)
 404                 return _do_setenv (0, 2, argv);
 405         else
 406                 return _do_setenv (0, 3, argv);
 407 }
 408
 409 #ifdef CONFIG_HAS_UID
 410 void forceenv (char *varname, char *varvalue)
 411 {
 412         char *argv[4] = { "forceenv", varname, varvalue, NULL };
 413         _do_setenv (0xdeaf4add, 3, argv);
 414 }
 415 #endif
 416
 417 int do_setenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 418 {
 419         if (argc < 2) {
 420                 cmd_usage(cmdtp);
 421                 return 1;
 422         }
 423
 424         return _do_setenv (flag, argc, argv);
 425 }
 426
 427 /************************************************************************
 428  * Prompt for environment variable
 429  */
 430
 431 #if defined(CONFIG_CMD_ASKENV)
 432 int do_askenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 433 {
 434         extern char console_buffer[CONFIG_SYS_CBSIZE];
 435         char message[CONFIG_SYS_CBSIZE];
 436         int size = CONFIG_SYS_CBSIZE - 1;
 437         int len;
 438         char *local_args[4];
 439
 440         local_args[0] = argv[0];
 441         local_args[1] = argv[1];
 442         local_args[2] = NULL;
 443         local_args[3] = NULL;
 444
 445         if (argc < 2) {
 446                 cmd_usage(cmdtp);
 447                 return 1;
 448         }
 449         /* Check the syntax */
 450         switch (argc) {
 451         case 1:
 452                 cmd_usage(cmdtp);
 453                 return 1;
 454
 455         case 2:         /* askenv envname */
 456                 sprintf (message, "Please enter '%s':", argv[1]);
 457                 break;
 458
 459         case 3:         /* askenv envname size */
 460                 sprintf (message, "Please enter '%s':", argv[1]);
 461                 size = simple_strtoul (argv[2], NULL, 10);
 462                 break;
 463
 464         default:        /* askenv envname message1 ... messagen size */
 465             {
 466                 int i;
 467                 int pos = 0;
 468
 469                 for (i = 2; i < argc - 1; i++) {
 470                         if (pos) {
 471                                 message[pos++] = ' ';
 472                         }
 473                         strcpy (message+pos, argv[i]);
 474                         pos += strlen(argv[i]);
 475                 }
 476                 message[pos] = '\0';
 477                 size = simple_strtoul (argv[argc - 1], NULL, 10);
 478             }
 479                 break;
 480         }
 481
 482         if (size >= CONFIG_SYS_CBSIZE)
 483                 size = CONFIG_SYS_CBSIZE - 1;
 484
 485         if (size <= 0)
 486                 return 1;
 487
 488         /* prompt for input */
 489         len = readline (message);
 490
 491         if (size < len)
 492                 console_buffer[size] = '\0';
 493
 494         len = 2;
 495         if (console_buffer[0] != '\0') {
 496                 local_args[2] = console_buffer;
 497                 len = 3;
 498         }
 499
 500         /* Continue calling setenv code */
 501         return _do_setenv (flag, len, local_args);
 502 }
 503 #endif
 504
 505 /************************************************************************
 506  * Look up variable from environment,
 507  * return address of storage for that variable,
 508  * or NULL if not found
 509  */
 510
 511 char *getenv (char *name)
 512 {
 513         int i, nxt;
 514
 515         WATCHDOG_RESET();
 516
 517         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 518                 int val;
 519
 520                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
 521                         if (nxt >= CONFIG_ENV_SIZE) {
 522                                 return (NULL);
 523                         }
 524                 }
 525                 if ((val=envmatch((uchar *)name, i)) < 0)
 526                         continue;
 527                 return ((char *)env_get_addr(val));
 528         }
 529
 530         return (NULL);
 531 }
 532
 533 int getenv_r (char *name, char *buf, unsigned len)
 534 {
 535         int i, nxt;
 536
 537         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 538                 int val, n;
 539
 540                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
 541                         if (nxt >= CONFIG_ENV_SIZE) {
 542                                 return (-1);
 543                         }
 544                 }
 545                 if ((val=envmatch((uchar *)name, i)) < 0)
 546                         continue;
 547                 /* found; copy out */
 548                 n = 0;
 549                 while ((len > n++) && (*buf++ = env_get_char(val++)) != '\0')
 550                         ;
 551                 if (len == n)
 552                         *buf = '\0';
 553                 return (n);
 554         }
 555         return (-1);
 556 }
 557
 558 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
 559
 560 int do_saveenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 561 {
 562         extern char * env_name_spec;
 563
 564         printf ("Saving Environment to %s...\n", env_name_spec);
 565
 566         return (saveenv() ? 1 : 0);
 567 }
 568
 569 U_BOOT_CMD(
 570         saveenv, 1, 0,  do_saveenv,
 571         "save environment variables to persistent storage",
 572         NULL
 573 );
 574
 575 #endif
 576
 577
 578 /************************************************************************
 579  * Match a name / name=value pair
 580  *
 581  * s1 is either a simple 'name', or a 'name=value' pair.
 582  * i2 is the environment index for a 'name2=value2' pair.
 583  * If the names match, return the index for the value2, else NULL.
 584  */
 585
 586 int envmatch (uchar *s1, int i2)
 587 {
 588
 589         while (*s1 == env_get_char(i2++))
 590                 if (*s1++ == '=')
 591                         return(i2);
 592         if (*s1 == '\0' && env_get_char(i2-1) == '=')
 593                 return(i2);
 594         return(-1);
 595 }
 596
 597
 598 /**************************************************/
 599
 600 U_BOOT_CMD(
 601         printenv, CONFIG_SYS_MAXARGS, 1,        do_printenv,
 602         "print environment variables",
 603         "\n    - print values of all environment variables\n"
 604         "printenv name ...\n"
 605         "    - print value of environment variable 'name'\n"
 606 );
 607
 608 U_BOOT_CMD(
 609         setenv, CONFIG_SYS_MAXARGS, 0,  do_setenv,
 610         "set environment variables",
 611         "name value ...\n"
 612         "    - set environment variable 'name' to 'value ...'\n"
 613         "setenv name\n"
 614         "    - delete environment variable 'name'\n"
 615 );
 616
 617 #if defined(CONFIG_CMD_ASKENV)
 618
 619 U_BOOT_CMD(
 620         askenv, CONFIG_SYS_MAXARGS,     1,      do_askenv,
 621         "get environment variables from stdin",
 622         "name [message] [size]\n"
 623         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 624         "askenv name\n"
 625         "    - get environment variable 'name' from stdin\n"
 626         "askenv name size\n"
 627         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 628         "askenv name [message] size\n"
 629         "    - display 'message' string and get environment variable 'name'"
 630         "from stdin (max 'size' chars)\n"
 631 );
 632 #endif
 633
 634 #if defined(CONFIG_CMD_RUN)
 635 int do_run (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
 636 U_BOOT_CMD(
 637         run,    CONFIG_SYS_MAXARGS,     1,      do_run,
 638         "run commands in an environment variable",
 639         "var [...]\n"
 640         "    - run the commands in the environment variable(s) 'var'\n"
 641 );
 642 #endif