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