cmd/nvedit.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000-2013
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  *
   6  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   7  * Andreas Heppel <aheppel@sysgo.de>
   8  *
   9  * Copyright 2011 Freescale Semiconductor, Inc.
  10  */
  11
  12 /*
  13  * Support for persistent environment data
  14  *
  15  * The "environment" is stored on external storage as a list of '\0'
  16  * terminated "name=value" strings. The end of the list is marked by
  17  * a double '\0'. The environment is preceded by a 32 bit CRC over
  18  * the data part and, in case of redundant environment, a byte of
  19  * flags.
  20  *
  21  * This linearized representation will also be used before
  22  * relocation, i. e. as long as we don't have a full C runtime
  23  * environment. After that, we use a hash table.
  24  */
  25
  26 #include <common.h>
  27 #include <cli.h>
  28 #include <command.h>
  29 #include <console.h>
  30 #include <environment.h>
  31 #include <search.h>
  32 #include <errno.h>
  33 #include <malloc.h>
  34 #include <mapmem.h>
  35 #include <watchdog.h>
  36 #include <linux/stddef.h>
  37 #include <asm/byteorder.h>
  38 #include <asm/io.h>
  39
  40 DECLARE_GLOBAL_DATA_PTR;
  41
  42 #if     !defined(CONFIG_ENV_IS_IN_EEPROM)       && \
  43         !defined(CONFIG_ENV_IS_IN_FLASH)        && \
  44         !defined(CONFIG_ENV_IS_IN_MMC)          && \
  45         !defined(CONFIG_ENV_IS_IN_FAT)          && \
  46         !defined(CONFIG_ENV_IS_IN_EXT4)         && \
  47         !defined(CONFIG_ENV_IS_IN_NAND)         && \
  48         !defined(CONFIG_ENV_IS_IN_NVRAM)        && \
  49         !defined(CONFIG_ENV_IS_IN_ONENAND)      && \
  50         !defined(CONFIG_ENV_IS_IN_SATA)         && \
  51         !defined(CONFIG_ENV_IS_IN_SPI_FLASH)    && \
  52         !defined(CONFIG_ENV_IS_IN_REMOTE)       && \
  53         !defined(CONFIG_ENV_IS_IN_UBI)          && \
  54         !defined(CONFIG_ENV_IS_NOWHERE)
  55 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|MMC|FAT|EXT4|\
  56 NAND|NVRAM|ONENAND|SATA|SPI_FLASH|REMOTE|UBI} or CONFIG_ENV_IS_NOWHERE
  57 #endif
  58
  59 /*
  60  * Maximum expected input data size for import command
  61  */
  62 #define MAX_ENV_SIZE    (1 << 20)       /* 1 MiB */
  63
  64 /*
  65  * This variable is incremented on each do_env_set(), so it can
  66  * be used via get_env_id() as an indication, if the environment
  67  * has changed or not. So it is possible to reread an environment
  68  * variable only if the environment was changed ... done so for
  69  * example in NetInitLoop()
  70  */
  71 static int env_id = 1;
  72
  73 int get_env_id(void)
  74 {
  75         return env_id;
  76 }
  77
  78 #ifndef CONFIG_SPL_BUILD
  79 /*
  80  * Command interface: print one or all environment variables
  81  *
  82  * Returns 0 in case of error, or length of printed string
  83  */
  84 static int env_print(char *name, int flag)
  85 {
  86         char *res = NULL;
  87         ssize_t len;
  88
  89         if (name) {             /* print a single name */
  90                 ENTRY e, *ep;
  91
  92                 e.key = name;
  93                 e.data = NULL;
  94                 hsearch_r(e, FIND, &ep, &env_htab, flag);
  95                 if (ep == NULL)
  96                         return 0;
  97                 len = printf("%s=%s\n", ep->key, ep->data);
  98                 return len;
  99         }
 100
 101         /* print whole list */
 102         len = hexport_r(&env_htab, '\n', flag, &res, 0, 0, NULL);
 103
 104         if (len > 0) {
 105                 puts(res);
 106                 free(res);
 107                 return len;
 108         }
 109
 110         /* should never happen */
 111         printf("## Error: cannot export environment\n");
 112         return 0;
 113 }
 114
 115 static int do_env_print(cmd_tbl_t *cmdtp, int flag, int argc,
 116                         char * const argv[])
 117 {
 118         int i;
 119         int rcode = 0;
 120         int env_flag = H_HIDE_DOT;
 121
 122         if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'a') {
 123                 argc--;
 124                 argv++;
 125                 env_flag &= ~H_HIDE_DOT;
 126         }
 127
 128         if (argc == 1) {
 129                 /* print all env vars */
 130                 rcode = env_print(NULL, env_flag);
 131                 if (!rcode)
 132                         return 1;
 133                 printf("\nEnvironment size: %d/%ld bytes\n",
 134                         rcode, (ulong)ENV_SIZE);
 135                 return 0;
 136         }
 137
 138         /* print selected env vars */
 139         env_flag &= ~H_HIDE_DOT;
 140         for (i = 1; i < argc; ++i) {
 141                 int rc = env_print(argv[i], env_flag);
 142                 if (!rc) {
 143                         printf("## Error: \"%s\" not defined\n", argv[i]);
 144                         ++rcode;
 145                 }
 146         }
 147
 148         return rcode;
 149 }
 150
 151 #ifdef CONFIG_CMD_GREPENV
 152 static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
 153                        int argc, char * const argv[])
 154 {
 155         char *res = NULL;
 156         int len, grep_how, grep_what;
 157
 158         if (argc < 2)
 159                 return CMD_RET_USAGE;
 160
 161         grep_how  = H_MATCH_SUBSTR;     /* default: substring search    */
 162         grep_what = H_MATCH_BOTH;       /* default: grep names and values */
 163
 164         while (--argc > 0 && **++argv == '-') {
 165                 char *arg = *argv;
 166                 while (*++arg) {
 167                         switch (*arg) {
 168 #ifdef CONFIG_REGEX
 169                         case 'e':               /* use regex matching */
 170                                 grep_how  = H_MATCH_REGEX;
 171                                 break;
 172 #endif
 173                         case 'n':               /* grep for name */
 174                                 grep_what = H_MATCH_KEY;
 175                                 break;
 176                         case 'v':               /* grep for value */
 177                                 grep_what = H_MATCH_DATA;
 178                                 break;
 179                         case 'b':               /* grep for both */
 180                                 grep_what = H_MATCH_BOTH;
 181                                 break;
 182                         case '-':
 183                                 goto DONE;
 184                         default:
 185                                 return CMD_RET_USAGE;
 186                         }
 187                 }
 188         }
 189
 190 DONE:
 191         len = hexport_r(&env_htab, '\n',
 192                         flag | grep_what | grep_how,
 193                         &res, 0, argc, argv);
 194
 195         if (len > 0) {
 196                 puts(res);
 197                 free(res);
 198         }
 199
 200         if (len < 2)
 201                 return 1;
 202
 203         return 0;
 204 }
 205 #endif
 206 #endif /* CONFIG_SPL_BUILD */
 207
 208 /*
 209  * Set a new environment variable,
 210  * or replace or delete an existing one.
 211  */
 212 static int _do_env_set(int flag, int argc, char * const argv[], int env_flag)
 213 {
 214         int   i, len;
 215         char  *name, *value, *s;
 216         ENTRY e, *ep;
 217
 218         debug("Initial value for argc=%d\n", argc);
 219         while (argc > 1 && **(argv + 1) == '-') {
 220                 char *arg = *++argv;
 221
 222                 --argc;
 223                 while (*++arg) {
 224                         switch (*arg) {
 225                         case 'f':               /* force */
 226                                 env_flag |= H_FORCE;
 227                                 break;
 228                         default:
 229                                 return CMD_RET_USAGE;
 230                         }
 231                 }
 232         }
 233         debug("Final value for argc=%d\n", argc);
 234         name = argv[1];
 235
 236         if (strchr(name, '=')) {
 237                 printf("## Error: illegal character '='"
 238                        "in variable name \"%s\"\n", name);
 239                 return 1;
 240         }
 241
 242         env_id++;
 243
 244         /* Delete only ? */
 245         if (argc < 3 || argv[2] == NULL) {
 246                 int rc = hdelete_r(name, &env_htab, env_flag);
 247                 return !rc;
 248         }
 249
 250         /*
 251          * Insert / replace new value
 252          */
 253         for (i = 2, len = 0; i < argc; ++i)
 254                 len += strlen(argv[i]) + 1;
 255
 256         value = malloc(len);
 257         if (value == NULL) {
 258                 printf("## Can't malloc %d bytes\n", len);
 259                 return 1;
 260         }
 261         for (i = 2, s = value; i < argc; ++i) {
 262                 char *v = argv[i];
 263
 264                 while ((*s++ = *v++) != '\0')
 265                         ;
 266                 *(s - 1) = ' ';
 267         }
 268         if (s != value)
 269                 *--s = '\0';
 270
 271         e.key   = name;
 272         e.data  = value;
 273         hsearch_r(e, ENTER, &ep, &env_htab, env_flag);
 274         free(value);
 275         if (!ep) {
 276                 printf("## Error inserting \"%s\" variable, errno=%d\n",
 277                         name, errno);
 278                 return 1;
 279         }
 280
 281         return 0;
 282 }
 283
 284 int env_set(const char *varname, const char *varvalue)
 285 {
 286         const char * const argv[4] = { "setenv", varname, varvalue, NULL };
 287
 288         /* before import into hashtable */
 289         if (!(gd->flags & GD_FLG_ENV_READY))
 290                 return 1;
 291
 292         if (varvalue == NULL || varvalue[0] == '\0')
 293                 return _do_env_set(0, 2, (char * const *)argv, H_PROGRAMMATIC);
 294         else
 295                 return _do_env_set(0, 3, (char * const *)argv, H_PROGRAMMATIC);
 296 }
 297
 298 /**
 299  * Set an environment variable to an integer value
 300  *
 301  * @param varname       Environment variable to set
 302  * @param value         Value to set it to
 303  * @return 0 if ok, 1 on error
 304  */
 305 int env_set_ulong(const char *varname, ulong value)
 306 {
 307         /* TODO: this should be unsigned */
 308         char *str = simple_itoa(value);
 309
 310         return env_set(varname, str);
 311 }
 312
 313 /**
 314  * Set an environment variable to an value in hex
 315  *
 316  * @param varname       Environment variable to set
 317  * @param value         Value to set it to
 318  * @return 0 if ok, 1 on error
 319  */
 320 int env_set_hex(const char *varname, ulong value)
 321 {
 322         char str[17];
 323
 324         sprintf(str, "%lx", value);
 325         return env_set(varname, str);
 326 }
 327
 328 ulong env_get_hex(const char *varname, ulong default_val)
 329 {
 330         const char *s;
 331         ulong value;
 332         char *endp;
 333
 334         s = env_get(varname);
 335         if (s)
 336                 value = simple_strtoul(s, &endp, 16);
 337         if (!s || endp == s)
 338                 return default_val;
 339
 340         return value;
 341 }
 342
 343 void eth_parse_enetaddr(const char *addr, uint8_t *enetaddr)
 344 {
 345         char *end;
 346         int i;
 347
 348         for (i = 0; i < 6; ++i) {
 349                 enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
 350                 if (addr)
 351                         addr = (*end) ? end + 1 : end;
 352         }
 353 }
 354
 355 int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr)
 356 {
 357         eth_parse_enetaddr(env_get(name), enetaddr);
 358         return is_valid_ethaddr(enetaddr);
 359 }
 360
 361 int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr)
 362 {
 363         char buf[ARP_HLEN_ASCII + 1];
 364
 365         if (eth_env_get_enetaddr(name, (uint8_t *)buf))
 366                 return -EEXIST;
 367
 368         sprintf(buf, "%pM", enetaddr);
 369
 370         return env_set(name, buf);
 371 }
 372
 373 #ifndef CONFIG_SPL_BUILD
 374 static int do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 375 {
 376         if (argc < 2)
 377                 return CMD_RET_USAGE;
 378
 379         return _do_env_set(flag, argc, argv, H_INTERACTIVE);
 380 }
 381
 382 /*
 383  * Prompt for environment variable
 384  */
 385 #if defined(CONFIG_CMD_ASKENV)
 386 int do_env_ask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 387 {
 388         char message[CONFIG_SYS_CBSIZE];
 389         int i, len, pos, size;
 390         char *local_args[4];
 391         char *endptr;
 392
 393         local_args[0] = argv[0];
 394         local_args[1] = argv[1];
 395         local_args[2] = NULL;
 396         local_args[3] = NULL;
 397
 398         /*
 399          * Check the syntax:
 400          *
 401          * env_ask envname [message1 ...] [size]
 402          */
 403         if (argc == 1)
 404                 return CMD_RET_USAGE;
 405
 406         /*
 407          * We test the last argument if it can be converted
 408          * into a decimal number.  If yes, we assume it's
 409          * the size.  Otherwise we echo it as part of the
 410          * message.
 411          */
 412         i = simple_strtoul(argv[argc - 1], &endptr, 10);
 413         if (*endptr != '\0') {                  /* no size */
 414                 size = CONFIG_SYS_CBSIZE - 1;
 415         } else {                                /* size given */
 416                 size = i;
 417                 --argc;
 418         }
 419
 420         if (argc <= 2) {
 421                 sprintf(message, "Please enter '%s': ", argv[1]);
 422         } else {
 423                 /* env_ask envname message1 ... messagen [size] */
 424                 for (i = 2, pos = 0; i < argc && pos+1 < sizeof(message); i++) {
 425                         if (pos)
 426                                 message[pos++] = ' ';
 427
 428                         strncpy(message + pos, argv[i], sizeof(message) - pos);
 429                         pos += strlen(argv[i]);
 430                 }
 431                 if (pos < sizeof(message) - 1) {
 432                         message[pos++] = ' ';
 433                         message[pos] = '\0';
 434                 } else
 435                         message[CONFIG_SYS_CBSIZE - 1] = '\0';
 436         }
 437
 438         if (size >= CONFIG_SYS_CBSIZE)
 439                 size = CONFIG_SYS_CBSIZE - 1;
 440
 441         if (size <= 0)
 442                 return 1;
 443
 444         /* prompt for input */
 445         len = cli_readline(message);
 446
 447         if (size < len)
 448                 console_buffer[size] = '\0';
 449
 450         len = 2;
 451         if (console_buffer[0] != '\0') {
 452                 local_args[2] = console_buffer;
 453                 len = 3;
 454         }
 455
 456         /* Continue calling setenv code */
 457         return _do_env_set(flag, len, local_args, H_INTERACTIVE);
 458 }
 459 #endif
 460
 461 #if defined(CONFIG_CMD_ENV_CALLBACK)
 462 static int print_static_binding(const char *var_name, const char *callback_name,
 463                                 void *priv)
 464 {
 465         printf("\t%-20s %-20s\n", var_name, callback_name);
 466
 467         return 0;
 468 }
 469
 470 static int print_active_callback(ENTRY *entry)
 471 {
 472         struct env_clbk_tbl *clbkp;
 473         int i;
 474         int num_callbacks;
 475
 476         if (entry->callback == NULL)
 477                 return 0;
 478
 479         /* look up the callback in the linker-list */
 480         num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
 481         for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
 482              i < num_callbacks;
 483              i++, clbkp++) {
 484 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 485                 if (entry->callback == clbkp->callback + gd->reloc_off)
 486 #else
 487                 if (entry->callback == clbkp->callback)
 488 #endif
 489                         break;
 490         }
 491
 492         if (i == num_callbacks)
 493                 /* this should probably never happen, but just in case... */
 494                 printf("\t%-20s %p\n", entry->key, entry->callback);
 495         else
 496                 printf("\t%-20s %-20s\n", entry->key, clbkp->name);
 497
 498         return 0;
 499 }
 500
 501 /*
 502  * Print the callbacks available and what they are bound to
 503  */
 504 int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 505 {
 506         struct env_clbk_tbl *clbkp;
 507         int i;
 508         int num_callbacks;
 509
 510         /* Print the available callbacks */
 511         puts("Available callbacks:\n");
 512         puts("\tCallback Name\n");
 513         puts("\t-------------\n");
 514         num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
 515         for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
 516              i < num_callbacks;
 517              i++, clbkp++)
 518                 printf("\t%s\n", clbkp->name);
 519         puts("\n");
 520
 521         /* Print the static bindings that may exist */
 522         puts("Static callback bindings:\n");
 523         printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
 524         printf("\t%-20s %-20s\n", "-------------", "-------------");
 525         env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding, NULL);
 526         puts("\n");
 527
 528         /* walk through each variable and print the callback if it has one */
 529         puts("Active callback bindings:\n");
 530         printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
 531         printf("\t%-20s %-20s\n", "-------------", "-------------");
 532         hwalk_r(&env_htab, print_active_callback);
 533         return 0;
 534 }
 535 #endif
 536
 537 #if defined(CONFIG_CMD_ENV_FLAGS)
 538 static int print_static_flags(const char *var_name, const char *flags,
 539                               void *priv)
 540 {
 541         enum env_flags_vartype type = env_flags_parse_vartype(flags);
 542         enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
 543
 544         printf("\t%-20s %-20s %-20s\n", var_name,
 545                 env_flags_get_vartype_name(type),
 546                 env_flags_get_varaccess_name(access));
 547
 548         return 0;
 549 }
 550
 551 static int print_active_flags(ENTRY *entry)
 552 {
 553         enum env_flags_vartype type;
 554         enum env_flags_varaccess access;
 555
 556         if (entry->flags == 0)
 557                 return 0;
 558
 559         type = (enum env_flags_vartype)
 560                 (entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
 561         access = env_flags_parse_varaccess_from_binflags(entry->flags);
 562         printf("\t%-20s %-20s %-20s\n", entry->key,
 563                 env_flags_get_vartype_name(type),
 564                 env_flags_get_varaccess_name(access));
 565
 566         return 0;
 567 }
 568
 569 /*
 570  * Print the flags available and what variables have flags
 571  */
 572 int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 573 {
 574         /* Print the available variable types */
 575         printf("Available variable type flags (position %d):\n",
 576                 ENV_FLAGS_VARTYPE_LOC);
 577         puts("\tFlag\tVariable Type Name\n");
 578         puts("\t----\t------------------\n");
 579         env_flags_print_vartypes();
 580         puts("\n");
 581
 582         /* Print the available variable access types */
 583         printf("Available variable access flags (position %d):\n",
 584                 ENV_FLAGS_VARACCESS_LOC);
 585         puts("\tFlag\tVariable Access Name\n");
 586         puts("\t----\t--------------------\n");
 587         env_flags_print_varaccess();
 588         puts("\n");
 589
 590         /* Print the static flags that may exist */
 591         puts("Static flags:\n");
 592         printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
 593                 "Variable Access");
 594         printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
 595                 "---------------");
 596         env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags, NULL);
 597         puts("\n");
 598
 599         /* walk through each variable and print the flags if non-default */
 600         puts("Active flags:\n");
 601         printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
 602                 "Variable Access");
 603         printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
 604                 "---------------");
 605         hwalk_r(&env_htab, print_active_flags);
 606         return 0;
 607 }
 608 #endif
 609
 610 /*
 611  * Interactively edit an environment variable
 612  */
 613 #if defined(CONFIG_CMD_EDITENV)
 614 static int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc,
 615                        char * const argv[])
 616 {
 617         char buffer[CONFIG_SYS_CBSIZE];
 618         char *init_val;
 619
 620         if (argc < 2)
 621                 return CMD_RET_USAGE;
 622
 623         /* before import into hashtable */
 624         if (!(gd->flags & GD_FLG_ENV_READY))
 625                 return 1;
 626
 627         /* Set read buffer to initial value or empty sting */
 628         init_val = env_get(argv[1]);
 629         if (init_val)
 630                 snprintf(buffer, CONFIG_SYS_CBSIZE, "%s", init_val);
 631         else
 632                 buffer[0] = '\0';
 633
 634         if (cli_readline_into_buffer("edit: ", buffer, 0) < 0)
 635                 return 1;
 636
 637         if (buffer[0] == '\0') {
 638                 const char * const _argv[3] = { "setenv", argv[1], NULL };
 639
 640                 return _do_env_set(0, 2, (char * const *)_argv, H_INTERACTIVE);
 641         } else {
 642                 const char * const _argv[4] = { "setenv", argv[1], buffer,
 643                         NULL };
 644
 645                 return _do_env_set(0, 3, (char * const *)_argv, H_INTERACTIVE);
 646         }
 647 }
 648 #endif /* CONFIG_CMD_EDITENV */
 649 #endif /* CONFIG_SPL_BUILD */
 650
 651 /*
 652  * Look up variable from environment,
 653  * return address of storage for that variable,
 654  * or NULL if not found
 655  */
 656 char *env_get(const char *name)
 657 {
 658         if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
 659                 ENTRY e, *ep;
 660
 661                 WATCHDOG_RESET();
 662
 663                 e.key   = name;
 664                 e.data  = NULL;
 665                 hsearch_r(e, FIND, &ep, &env_htab, 0);
 666
 667                 return ep ? ep->data : NULL;
 668         }
 669
 670         /* restricted capabilities before import */
 671         if (env_get_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
 672                 return (char *)(gd->env_buf);
 673
 674         return NULL;
 675 }
 676
 677 /*
 678  * Look up variable from environment for restricted C runtime env.
 679  */
 680 int env_get_f(const char *name, char *buf, unsigned len)
 681 {
 682         int i, nxt, c;
 683
 684         for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
 685                 int val, n;
 686
 687                 for (nxt = i; (c = env_get_char(nxt)) != '\0'; ++nxt) {
 688                         if (c < 0)
 689                                 return c;
 690                         if (nxt >= CONFIG_ENV_SIZE)
 691                                 return -1;
 692                 }
 693
 694                 val = envmatch((uchar *)name, i);
 695                 if (val < 0)
 696                         continue;
 697
 698                 /* found; copy out */
 699                 for (n = 0; n < len; ++n, ++buf) {
 700                         c = env_get_char(val++);
 701                         if (c < 0)
 702                                 return c;
 703                         *buf = c;
 704                         if (*buf == '\0')
 705                                 return n;
 706                 }
 707
 708                 if (n)
 709                         *--buf = '\0';
 710
 711                 printf("env_buf [%d bytes] too small for value of \"%s\"\n",
 712                         len, name);
 713
 714                 return n;
 715         }
 716
 717         return -1;
 718 }
 719
 720 /**
 721  * Decode the integer value of an environment variable and return it.
 722  *
 723  * @param name          Name of environment variable
 724  * @param base          Number base to use (normally 10, or 16 for hex)
 725  * @param default_val   Default value to return if the variable is not
 726  *                      found
 727  * @return the decoded value, or default_val if not found
 728  */
 729 ulong env_get_ulong(const char *name, int base, ulong default_val)
 730 {
 731         /*
 732          * We can use env_get() here, even before relocation, since the
 733          * environment variable value is an integer and thus short.
 734          */
 735         const char *str = env_get(name);
 736
 737         return str ? simple_strtoul(str, NULL, base) : default_val;
 738 }
 739
 740 #ifndef CONFIG_SPL_BUILD
 741 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
 742 static int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc,
 743                        char * const argv[])
 744 {
 745         return env_save() ? 1 : 0;
 746 }
 747
 748 U_BOOT_CMD(
 749         saveenv, 1, 0,  do_env_save,
 750         "save environment variables to persistent storage",
 751         ""
 752 );
 753 #endif
 754 #endif /* CONFIG_SPL_BUILD */
 755
 756
 757 /*
 758  * Match a name / name=value pair
 759  *
 760  * s1 is either a simple 'name', or a 'name=value' pair.
 761  * i2 is the environment index for a 'name2=value2' pair.
 762  * If the names match, return the index for the value2, else -1.
 763  */
 764 int envmatch(uchar *s1, int i2)
 765 {
 766         if (s1 == NULL)
 767                 return -1;
 768
 769         while (*s1 == env_get_char(i2++))
 770                 if (*s1++ == '=')
 771                         return i2;
 772
 773         if (*s1 == '\0' && env_get_char(i2-1) == '=')
 774                 return i2;
 775
 776         return -1;
 777 }
 778
 779 #ifndef CONFIG_SPL_BUILD
 780 static int do_env_default(cmd_tbl_t *cmdtp, int flag,
 781                           int argc, char * const argv[])
 782 {
 783         int all = 0, env_flag = 0;
 784
 785         debug("Initial value for argc=%d\n", argc);
 786         while (--argc > 0 && **++argv == '-') {
 787                 char *arg = *argv;
 788
 789                 while (*++arg) {
 790                         switch (*arg) {
 791                         case 'a':               /* default all */
 792                                 all = 1;
 793                                 break;
 794                         case 'f':               /* force */
 795                                 env_flag |= H_FORCE;
 796                                 break;
 797                         default:
 798                                 return cmd_usage(cmdtp);
 799                         }
 800                 }
 801         }
 802         debug("Final value for argc=%d\n", argc);
 803         if (all && (argc == 0)) {
 804                 /* Reset the whole environment */
 805                 set_default_env("## Resetting to default environment\n");
 806                 return 0;
 807         }
 808         if (!all && (argc > 0)) {
 809                 /* Reset individual variables */
 810                 set_default_vars(argc, argv, env_flag);
 811                 return 0;
 812         }
 813
 814         return cmd_usage(cmdtp);
 815 }
 816
 817 static int do_env_delete(cmd_tbl_t *cmdtp, int flag,
 818                          int argc, char * const argv[])
 819 {
 820         int env_flag = H_INTERACTIVE;
 821         int ret = 0;
 822
 823         debug("Initial value for argc=%d\n", argc);
 824         while (argc > 1 && **(argv + 1) == '-') {
 825                 char *arg = *++argv;
 826
 827                 --argc;
 828                 while (*++arg) {
 829                         switch (*arg) {
 830                         case 'f':               /* force */
 831                                 env_flag |= H_FORCE;
 832                                 break;
 833                         default:
 834                                 return CMD_RET_USAGE;
 835                         }
 836                 }
 837         }
 838         debug("Final value for argc=%d\n", argc);
 839
 840         env_id++;
 841
 842         while (--argc > 0) {
 843                 char *name = *++argv;
 844
 845                 if (!hdelete_r(name, &env_htab, env_flag))
 846                         ret = 1;
 847         }
 848
 849         return ret;
 850 }
 851
 852 #ifdef CONFIG_CMD_EXPORTENV
 853 /*
 854  * env export [-t | -b | -c] [-s size] addr [var ...]
 855  *      -t:     export as text format; if size is given, data will be
 856  *              padded with '\0' bytes; if not, one terminating '\0'
 857  *              will be added (which is included in the "filesize"
 858  *              setting so you can for exmple copy this to flash and
 859  *              keep the termination).
 860  *      -b:     export as binary format (name=value pairs separated by
 861  *              '\0', list end marked by double "\0\0")
 862  *      -c:     export as checksum protected environment format as
 863  *              used for example by "saveenv" command
 864  *      -s size:
 865  *              size of output buffer
 866  *      addr:   memory address where environment gets stored
 867  *      var...  List of variable names that get included into the
 868  *              export. Without arguments, the whole environment gets
 869  *              exported.
 870  *
 871  * With "-c" and size is NOT given, then the export command will
 872  * format the data as currently used for the persistent storage,
 873  * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
 874  * prepend a valid CRC32 checksum and, in case of redundant
 875  * environment, a "current" redundancy flag. If size is given, this
 876  * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
 877  * checksum and redundancy flag will be inserted.
 878  *
 879  * With "-b" and "-t", always only the real data (including a
 880  * terminating '\0' byte) will be written; here the optional size
 881  * argument will be used to make sure not to overflow the user
 882  * provided buffer; the command will abort if the size is not
 883  * sufficient. Any remaining space will be '\0' padded.
 884  *
 885  * On successful return, the variable "filesize" will be set.
 886  * Note that filesize includes the trailing/terminating '\0' byte(s).
 887  *
 888  * Usage scenario:  create a text snapshot/backup of the current settings:
 889  *
 890  *      => env export -t 100000
 891  *      => era ${backup_addr} +${filesize}
 892  *      => cp.b 100000 ${backup_addr} ${filesize}
 893  *
 894  * Re-import this snapshot, deleting all other settings:
 895  *
 896  *      => env import -d -t ${backup_addr}
 897  */
 898 static int do_env_export(cmd_tbl_t *cmdtp, int flag,
 899                          int argc, char * const argv[])
 900 {
 901         char    buf[32];
 902         ulong   addr;
 903         char    *ptr, *cmd, *res;
 904         size_t  size = 0;
 905         ssize_t len;
 906         env_t   *envp;
 907         char    sep = '\n';
 908         int     chk = 0;
 909         int     fmt = 0;
 910
 911         cmd = *argv;
 912
 913         while (--argc > 0 && **++argv == '-') {
 914                 char *arg = *argv;
 915                 while (*++arg) {
 916                         switch (*arg) {
 917                         case 'b':               /* raw binary format */
 918                                 if (fmt++)
 919                                         goto sep_err;
 920                                 sep = '\0';
 921                                 break;
 922                         case 'c':               /* external checksum format */
 923                                 if (fmt++)
 924                                         goto sep_err;
 925                                 sep = '\0';
 926                                 chk = 1;
 927                                 break;
 928                         case 's':               /* size given */
 929                                 if (--argc <= 0)
 930                                         return cmd_usage(cmdtp);
 931                                 size = simple_strtoul(*++argv, NULL, 16);
 932                                 goto NXTARG;
 933                         case 't':               /* text format */
 934                                 if (fmt++)
 935                                         goto sep_err;
 936                                 sep = '\n';
 937                                 break;
 938                         default:
 939                                 return CMD_RET_USAGE;
 940                         }
 941                 }
 942 NXTARG:         ;
 943         }
 944
 945         if (argc < 1)
 946                 return CMD_RET_USAGE;
 947
 948         addr = simple_strtoul(argv[0], NULL, 16);
 949         ptr = map_sysmem(addr, size);
 950
 951         if (size)
 952                 memset(ptr, '\0', size);
 953
 954         argc--;
 955         argv++;
 956
 957         if (sep) {              /* export as text file */
 958                 len = hexport_r(&env_htab, sep,
 959                                 H_MATCH_KEY | H_MATCH_IDENT,
 960                                 &ptr, size, argc, argv);
 961                 if (len < 0) {
 962                         pr_err("Cannot export environment: errno = %d\n", errno);
 963                         return 1;
 964                 }
 965                 sprintf(buf, "%zX", (size_t)len);
 966                 env_set("filesize", buf);
 967
 968                 return 0;
 969         }
 970
 971         envp = (env_t *)ptr;
 972
 973         if (chk)                /* export as checksum protected block */
 974                 res = (char *)envp->data;
 975         else                    /* export as raw binary data */
 976                 res = ptr;
 977
 978         len = hexport_r(&env_htab, '\0',
 979                         H_MATCH_KEY | H_MATCH_IDENT,
 980                         &res, ENV_SIZE, argc, argv);
 981         if (len < 0) {
 982                 pr_err("Cannot export environment: errno = %d\n", errno);
 983                 return 1;
 984         }
 985
 986         if (chk) {
 987                 envp->crc = crc32(0, envp->data, ENV_SIZE);
 988 #ifdef CONFIG_ENV_ADDR_REDUND
 989                 envp->flags = ACTIVE_FLAG;
 990 #endif
 991         }
 992         env_set_hex("filesize", len + offsetof(env_t, data));
 993
 994         return 0;
 995
 996 sep_err:
 997         printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n", cmd);
 998         return 1;
 999 }
1000 #endif
1001
1002 #ifdef CONFIG_CMD_IMPORTENV
1003 /*
1004  * env import [-d] [-t [-r] | -b | -c] addr [size]
1005  *      -d:     delete existing environment before importing;
1006  *              otherwise overwrite / append to existing definitions
1007  *      -t:     assume text format; either "size" must be given or the
1008  *              text data must be '\0' terminated
1009  *      -r:     handle CRLF like LF, that means exported variables with
1010  *              a content which ends with \r won't get imported. Used
1011  *              to import text files created with editors which are using CRLF
1012  *              for line endings. Only effective in addition to -t.
1013  *      -b:     assume binary format ('\0' separated, "\0\0" terminated)
1014  *      -c:     assume checksum protected environment format
1015  *      addr:   memory address to read from
1016  *      size:   length of input data; if missing, proper '\0'
1017  *              termination is mandatory
1018  */
1019 static int do_env_import(cmd_tbl_t *cmdtp, int flag,
1020                          int argc, char * const argv[])
1021 {
1022         ulong   addr;
1023         char    *cmd, *ptr;
1024         char    sep = '\n';
1025         int     chk = 0;
1026         int     fmt = 0;
1027         int     del = 0;
1028         int     crlf_is_lf = 0;
1029         size_t  size;
1030
1031         cmd = *argv;
1032
1033         while (--argc > 0 && **++argv == '-') {
1034                 char *arg = *argv;
1035                 while (*++arg) {
1036                         switch (*arg) {
1037                         case 'b':               /* raw binary format */
1038                                 if (fmt++)
1039                                         goto sep_err;
1040                                 sep = '\0';
1041                                 break;
1042                         case 'c':               /* external checksum format */
1043                                 if (fmt++)
1044                                         goto sep_err;
1045                                 sep = '\0';
1046                                 chk = 1;
1047                                 break;
1048                         case 't':               /* text format */
1049                                 if (fmt++)
1050                                         goto sep_err;
1051                                 sep = '\n';
1052                                 break;
1053                         case 'r':               /* handle CRLF like LF */
1054                                 crlf_is_lf = 1;
1055                                 break;
1056                         case 'd':
1057                                 del = 1;
1058                                 break;
1059                         default:
1060                                 return CMD_RET_USAGE;
1061                         }
1062                 }
1063         }
1064
1065         if (argc < 1)
1066                 return CMD_RET_USAGE;
1067
1068         if (!fmt)
1069                 printf("## Warning: defaulting to text format\n");
1070
1071         if (sep != '\n' && crlf_is_lf )
1072                 crlf_is_lf = 0;
1073
1074         addr = simple_strtoul(argv[0], NULL, 16);
1075         ptr = map_sysmem(addr, 0);
1076
1077         if (argc == 2) {
1078                 size = simple_strtoul(argv[1], NULL, 16);
1079         } else if (argc == 1 && chk) {
1080                 puts("## Error: external checksum format must pass size\n");
1081                 return CMD_RET_FAILURE;
1082         } else {
1083                 char *s = ptr;
1084
1085                 size = 0;
1086
1087                 while (size < MAX_ENV_SIZE) {
1088                         if ((*s == sep) && (*(s+1) == '\0'))
1089                                 break;
1090                         ++s;
1091                         ++size;
1092                 }
1093                 if (size == MAX_ENV_SIZE) {
1094                         printf("## Warning: Input data exceeds %d bytes"
1095                                 " - truncated\n", MAX_ENV_SIZE);
1096                 }
1097                 size += 2;
1098                 printf("## Info: input data size = %zu = 0x%zX\n", size, size);
1099         }
1100
1101         if (chk) {
1102                 uint32_t crc;
1103                 env_t *ep = (env_t *)ptr;
1104
1105                 size -= offsetof(env_t, data);
1106                 memcpy(&crc, &ep->crc, sizeof(crc));
1107
1108                 if (crc32(0, ep->data, size) != crc) {
1109                         puts("## Error: bad CRC, import failed\n");
1110                         return 1;
1111                 }
1112                 ptr = (char *)ep->data;
1113         }
1114
1115         if (himport_r(&env_htab, ptr, size, sep, del ? 0 : H_NOCLEAR,
1116                         crlf_is_lf, 0, NULL) == 0) {
1117                 pr_err("Environment import failed: errno = %d\n", errno);
1118                 return 1;
1119         }
1120         gd->flags |= GD_FLG_ENV_READY;
1121
1122         return 0;
1123
1124 sep_err:
1125         printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
1126                 cmd);
1127         return 1;
1128 }
1129 #endif
1130
1131 #if defined(CONFIG_CMD_ENV_EXISTS)
1132 static int do_env_exists(cmd_tbl_t *cmdtp, int flag, int argc,
1133                        char * const argv[])
1134 {
1135         ENTRY e, *ep;
1136
1137         if (argc < 2)
1138                 return CMD_RET_USAGE;
1139
1140         e.key = argv[1];
1141         e.data = NULL;
1142         hsearch_r(e, FIND, &ep, &env_htab, 0);
1143
1144         return (ep == NULL) ? 1 : 0;
1145 }
1146 #endif
1147
1148 /*
1149  * New command line interface: "env" command with subcommands
1150  */
1151 static cmd_tbl_t cmd_env_sub[] = {
1152 #if defined(CONFIG_CMD_ASKENV)
1153         U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
1154 #endif
1155         U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
1156         U_BOOT_CMD_MKENT(delete, CONFIG_SYS_MAXARGS, 0, do_env_delete, "", ""),
1157 #if defined(CONFIG_CMD_EDITENV)
1158         U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
1159 #endif
1160 #if defined(CONFIG_CMD_ENV_CALLBACK)
1161         U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
1162 #endif
1163 #if defined(CONFIG_CMD_ENV_FLAGS)
1164         U_BOOT_CMD_MKENT(flags, 1, 0, do_env_flags, "", ""),
1165 #endif
1166 #if defined(CONFIG_CMD_EXPORTENV)
1167         U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
1168 #endif
1169 #if defined(CONFIG_CMD_GREPENV)
1170         U_BOOT_CMD_MKENT(grep, CONFIG_SYS_MAXARGS, 1, do_env_grep, "", ""),
1171 #endif
1172 #if defined(CONFIG_CMD_IMPORTENV)
1173         U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
1174 #endif
1175         U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
1176 #if defined(CONFIG_CMD_RUN)
1177         U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
1178 #endif
1179 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1180         U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
1181 #endif
1182         U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
1183 #if defined(CONFIG_CMD_ENV_EXISTS)
1184         U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
1185 #endif
1186 };
1187
1188 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
1189 void env_reloc(void)
1190 {
1191         fixup_cmdtable(cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1192 }
1193 #endif
1194
1195 static int do_env(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1196 {
1197         cmd_tbl_t *cp;
1198
1199         if (argc < 2)
1200                 return CMD_RET_USAGE;
1201
1202         /* drop initial "env" arg */
1203         argc--;
1204         argv++;
1205
1206         cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1207
1208         if (cp)
1209                 return cp->cmd(cmdtp, flag, argc, argv);
1210
1211         return CMD_RET_USAGE;
1212 }
1213
1214 #ifdef CONFIG_SYS_LONGHELP
1215 static char env_help_text[] =
1216 #if defined(CONFIG_CMD_ASKENV)
1217         "ask name [message] [size] - ask for environment variable\nenv "
1218 #endif
1219 #if defined(CONFIG_CMD_ENV_CALLBACK)
1220         "callbacks - print callbacks and their associated variables\nenv "
1221 #endif
1222         "default [-f] -a - [forcibly] reset default environment\n"
1223         "env default [-f] var [...] - [forcibly] reset variable(s) to their default values\n"
1224         "env delete [-f] var [...] - [forcibly] delete variable(s)\n"
1225 #if defined(CONFIG_CMD_EDITENV)
1226         "env edit name - edit environment variable\n"
1227 #endif
1228 #if defined(CONFIG_CMD_ENV_EXISTS)
1229         "env exists name - tests for existence of variable\n"
1230 #endif
1231 #if defined(CONFIG_CMD_EXPORTENV)
1232         "env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
1233 #endif
1234 #if defined(CONFIG_CMD_ENV_FLAGS)
1235         "env flags - print variables that have non-default flags\n"
1236 #endif
1237 #if defined(CONFIG_CMD_GREPENV)
1238 #ifdef CONFIG_REGEX
1239         "env grep [-e] [-n | -v | -b] string [...] - search environment\n"
1240 #else
1241         "env grep [-n | -v | -b] string [...] - search environment\n"
1242 #endif
1243 #endif
1244 #if defined(CONFIG_CMD_IMPORTENV)
1245         "env import [-d] [-t [-r] | -b | -c] addr [size] - import environment\n"
1246 #endif
1247         "env print [-a | name ...] - print environment\n"
1248 #if defined(CONFIG_CMD_RUN)
1249         "env run var [...] - run commands in an environment variable\n"
1250 #endif
1251 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1252         "env save - save environment\n"
1253 #endif
1254         "env set [-f] name [arg ...]\n";
1255 #endif
1256
1257 U_BOOT_CMD(
1258         env, CONFIG_SYS_MAXARGS, 1, do_env,
1259         "environment handling commands", env_help_text
1260 );
1261
1262 /*
1263  * Old command line interface, kept for compatibility
1264  */
1265
1266 #if defined(CONFIG_CMD_EDITENV)
1267 U_BOOT_CMD_COMPLETE(
1268         editenv, 2, 0,  do_env_edit,
1269         "edit environment variable",
1270         "name\n"
1271         "    - edit environment variable 'name'",
1272         var_complete
1273 );
1274 #endif
1275
1276 U_BOOT_CMD_COMPLETE(
1277         printenv, CONFIG_SYS_MAXARGS, 1,        do_env_print,
1278         "print environment variables",
1279         "[-a]\n    - print [all] values of all environment variables\n"
1280         "printenv name ...\n"
1281         "    - print value of environment variable 'name'",
1282         var_complete
1283 );
1284
1285 #ifdef CONFIG_CMD_GREPENV
1286 U_BOOT_CMD_COMPLETE(
1287         grepenv, CONFIG_SYS_MAXARGS, 0,  do_env_grep,
1288         "search environment variables",
1289 #ifdef CONFIG_REGEX
1290         "[-e] [-n | -v | -b] string ...\n"
1291 #else
1292         "[-n | -v | -b] string ...\n"
1293 #endif
1294         "    - list environment name=value pairs matching 'string'\n"
1295 #ifdef CONFIG_REGEX
1296         "      \"-e\": enable regular expressions;\n"
1297 #endif
1298         "      \"-n\": search variable names; \"-v\": search values;\n"
1299         "      \"-b\": search both names and values (default)",
1300         var_complete
1301 );
1302 #endif
1303
1304 U_BOOT_CMD_COMPLETE(
1305         setenv, CONFIG_SYS_MAXARGS, 0,  do_env_set,
1306         "set environment variables",
1307         "[-f] name value ...\n"
1308         "    - [forcibly] set environment variable 'name' to 'value ...'\n"
1309         "setenv [-f] name\n"
1310         "    - [forcibly] delete environment variable 'name'",
1311         var_complete
1312 );
1313
1314 #if defined(CONFIG_CMD_ASKENV)
1315
1316 U_BOOT_CMD(
1317         askenv, CONFIG_SYS_MAXARGS,     1,      do_env_ask,
1318         "get environment variables from stdin",
1319         "name [message] [size]\n"
1320         "    - get environment variable 'name' from stdin (max 'size' chars)"
1321 );
1322 #endif
1323
1324 #if defined(CONFIG_CMD_RUN)
1325 U_BOOT_CMD_COMPLETE(
1326         run,    CONFIG_SYS_MAXARGS,     1,      do_run,
1327         "run commands in an environment variable",
1328         "var [...]\n"
1329         "    - run the commands in the environment variable(s) 'var'",
1330         var_complete
1331 );
1332 #endif
1333 #endif /* CONFIG_SPL_BUILD */