1 /* 2 * (C) Copyright 2000-2010 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * (C) Copyright 2008 6 * Guennadi Liakhovetski, DENX Software Engineering, lg@denx.de. 7 * 8 * SPDX-License-Identifier: GPL-2.0+ 9 */ 10 11 #define _GNU_SOURCE 12 13 #include <compiler.h> 14 #include <errno.h> 15 #include <env_flags.h> 16 #include <fcntl.h> 17 #include <linux/fs.h> 18 #include <linux/stringify.h> 19 #include <ctype.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <stddef.h> 23 #include <string.h> 24 #include <sys/types.h> 25 #include <sys/ioctl.h> 26 #include <sys/stat.h> 27 #include <unistd.h> 28 #include <dirent.h> 29 30 #ifdef MTD_OLD 31 # include <stdint.h> 32 # include <linux/mtd/mtd.h> 33 #else 34 # define __user /* nothing */ 35 # include <mtd/mtd-user.h> 36 #endif 37 38 #include <mtd/ubi-user.h> 39 40 #include "fw_env_private.h" 41 #include "fw_env.h" 42 43 struct env_opts default_opts = { 44 #ifdef CONFIG_FILE 45 .config_file = CONFIG_FILE 46 #endif 47 }; 48 49 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 50 51 #define min(x, y) ({ \ 52 typeof(x) _min1 = (x); \ 53 typeof(y) _min2 = (y); \ 54 (void) (&_min1 == &_min2); \ 55 _min1 < _min2 ? _min1 : _min2; }) 56 57 struct envdev_s { 58 const char *devname; /* Device name */ 59 long long devoff; /* Device offset */ 60 ulong env_size; /* environment size */ 61 ulong erase_size; /* device erase size */ 62 ulong env_sectors; /* number of environment sectors */ 63 uint8_t mtd_type; /* type of the MTD device */ 64 int is_ubi; /* set if we use UBI volume */ 65 }; 66 67 static struct envdev_s envdevices[2] = 68 { 69 { 70 .mtd_type = MTD_ABSENT, 71 }, { 72 .mtd_type = MTD_ABSENT, 73 }, 74 }; 75 static int dev_current; 76 77 #define DEVNAME(i) envdevices[(i)].devname 78 #define DEVOFFSET(i) envdevices[(i)].devoff 79 #define ENVSIZE(i) envdevices[(i)].env_size 80 #define DEVESIZE(i) envdevices[(i)].erase_size 81 #define ENVSECTORS(i) envdevices[(i)].env_sectors 82 #define DEVTYPE(i) envdevices[(i)].mtd_type 83 #define IS_UBI(i) envdevices[(i)].is_ubi 84 85 #define CUR_ENVSIZE ENVSIZE(dev_current) 86 87 static unsigned long usable_envsize; 88 #define ENV_SIZE usable_envsize 89 90 struct env_image_single { 91 uint32_t crc; /* CRC32 over data bytes */ 92 char data[]; 93 }; 94 95 struct env_image_redundant { 96 uint32_t crc; /* CRC32 over data bytes */ 97 unsigned char flags; /* active or obsolete */ 98 char data[]; 99 }; 100 101 enum flag_scheme { 102 FLAG_NONE, 103 FLAG_BOOLEAN, 104 FLAG_INCREMENTAL, 105 }; 106 107 struct environment { 108 void *image; 109 uint32_t *crc; 110 unsigned char *flags; 111 char *data; 112 enum flag_scheme flag_scheme; 113 }; 114 115 static struct environment environment = { 116 .flag_scheme = FLAG_NONE, 117 }; 118 119 static int HaveRedundEnv = 0; 120 121 static unsigned char active_flag = 1; 122 /* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */ 123 static unsigned char obsolete_flag = 0; 124 125 #define DEFAULT_ENV_INSTANCE_STATIC 126 #include <env_default.h> 127 128 #define UBI_DEV_START "/dev/ubi" 129 #define UBI_SYSFS "/sys/class/ubi" 130 #define UBI_VOL_NAME_PATT "ubi%d_%d" 131 132 static int is_ubi_devname(const char *devname) 133 { 134 return !strncmp(devname, UBI_DEV_START, sizeof(UBI_DEV_START) - 1); 135 } 136 137 static int ubi_check_volume_sysfs_name(const char *volume_sysfs_name, 138 const char *volname) 139 { 140 char path[256]; 141 FILE *file; 142 char *name; 143 int ret; 144 145 strcpy(path, UBI_SYSFS "/"); 146 strcat(path, volume_sysfs_name); 147 strcat(path, "/name"); 148 149 file = fopen(path, "r"); 150 if (!file) 151 return -1; 152 153 ret = fscanf(file, "%ms", &name); 154 fclose(file); 155 if (ret <= 0 || !name) { 156 fprintf(stderr, 157 "Failed to read from file %s, ret = %d, name = %s\n", 158 path, ret, name); 159 return -1; 160 } 161 162 if (!strcmp(name, volname)) { 163 free(name); 164 return 0; 165 } 166 free(name); 167 168 return -1; 169 } 170 171 static int ubi_get_volnum_by_name(int devnum, const char *volname) 172 { 173 DIR *sysfs_ubi; 174 struct dirent *dirent; 175 int ret; 176 int tmp_devnum; 177 int volnum; 178 179 sysfs_ubi = opendir(UBI_SYSFS); 180 if (!sysfs_ubi) 181 return -1; 182 183 #ifdef DEBUG 184 fprintf(stderr, "Looking for volume name \"%s\"\n", volname); 185 #endif 186 187 while (1) { 188 dirent = readdir(sysfs_ubi); 189 if (!dirent) 190 return -1; 191 192 ret = sscanf(dirent->d_name, UBI_VOL_NAME_PATT, 193 &tmp_devnum, &volnum); 194 if (ret == 2 && devnum == tmp_devnum) { 195 if (ubi_check_volume_sysfs_name(dirent->d_name, 196 volname) == 0) 197 return volnum; 198 } 199 } 200 201 return -1; 202 } 203 204 static int ubi_get_devnum_by_devname(const char *devname) 205 { 206 int devnum; 207 int ret; 208 209 ret = sscanf(devname + sizeof(UBI_DEV_START) - 1, "%d", &devnum); 210 if (ret != 1) 211 return -1; 212 213 return devnum; 214 } 215 216 static const char *ubi_get_volume_devname(const char *devname, 217 const char *volname) 218 { 219 char *volume_devname; 220 int volnum; 221 int devnum; 222 int ret; 223 224 devnum = ubi_get_devnum_by_devname(devname); 225 if (devnum < 0) 226 return NULL; 227 228 volnum = ubi_get_volnum_by_name(devnum, volname); 229 if (volnum < 0) 230 return NULL; 231 232 ret = asprintf(&volume_devname, "%s_%d", devname, volnum); 233 if (ret < 0) 234 return NULL; 235 236 #ifdef DEBUG 237 fprintf(stderr, "Found ubi volume \"%s:%s\" -> %s\n", 238 devname, volname, volume_devname); 239 #endif 240 241 return volume_devname; 242 } 243 244 static void ubi_check_dev(unsigned int dev_id) 245 { 246 char *devname = (char *)DEVNAME(dev_id); 247 char *pname; 248 const char *volname = NULL; 249 const char *volume_devname; 250 251 if (!is_ubi_devname(DEVNAME(dev_id))) 252 return; 253 254 IS_UBI(dev_id) = 1; 255 256 for (pname = devname; *pname != '\0'; pname++) { 257 if (*pname == ':') { 258 *pname = '\0'; 259 volname = pname + 1; 260 break; 261 } 262 } 263 264 if (volname) { 265 /* Let's find real volume device name */ 266 volume_devname = ubi_get_volume_devname(devname, volname); 267 if (!volume_devname) { 268 fprintf(stderr, "Didn't found ubi volume \"%s\"\n", 269 volname); 270 return; 271 } 272 273 free(devname); 274 DEVNAME(dev_id) = volume_devname; 275 } 276 } 277 278 static int ubi_update_start(int fd, int64_t bytes) 279 { 280 if (ioctl(fd, UBI_IOCVOLUP, &bytes)) 281 return -1; 282 return 0; 283 } 284 285 static int ubi_read(int fd, void *buf, size_t count) 286 { 287 ssize_t ret; 288 289 while (count > 0) { 290 ret = read(fd, buf, count); 291 if (ret > 0) { 292 count -= ret; 293 buf += ret; 294 295 continue; 296 } 297 298 if (ret == 0) { 299 /* 300 * Happens in case of too short volume data size. If we 301 * return error status we will fail it will be treated 302 * as UBI device error. 303 * 304 * Leave catching this error to CRC check. 305 */ 306 fprintf(stderr, "Warning: end of data on ubi volume\n"); 307 return 0; 308 } else if (errno == EBADF) { 309 /* 310 * Happens in case of corrupted volume. The same as 311 * above, we cannot return error now, as we will still 312 * be able to successfully write environment later. 313 */ 314 fprintf(stderr, "Warning: corrupted volume?\n"); 315 return 0; 316 } else if (errno == EINTR) { 317 continue; 318 } 319 320 fprintf(stderr, "Cannot read %u bytes from ubi volume, %s\n", 321 (unsigned int)count, strerror(errno)); 322 return -1; 323 } 324 325 return 0; 326 } 327 328 static int ubi_write(int fd, const void *buf, size_t count) 329 { 330 ssize_t ret; 331 332 while (count > 0) { 333 ret = write(fd, buf, count); 334 if (ret <= 0) { 335 if (ret < 0 && errno == EINTR) 336 continue; 337 338 fprintf(stderr, "Cannot write %u bytes to ubi volume\n", 339 (unsigned int)count); 340 return -1; 341 } 342 343 count -= ret; 344 buf += ret; 345 } 346 347 return 0; 348 } 349 350 static int flash_io (int mode); 351 static int parse_config(struct env_opts *opts); 352 353 #if defined(CONFIG_FILE) 354 static int get_config (char *); 355 #endif 356 357 static char *skip_chars(char *s) 358 { 359 for (; *s != '\0'; s++) { 360 if (isblank(*s)) 361 return s; 362 } 363 return NULL; 364 } 365 366 static char *skip_blanks(char *s) 367 { 368 for (; *s != '\0'; s++) { 369 if (!isblank(*s)) 370 return s; 371 } 372 return NULL; 373 } 374 375 /* 376 * s1 is either a simple 'name', or a 'name=value' pair. 377 * s2 is a 'name=value' pair. 378 * If the names match, return the value of s2, else NULL. 379 */ 380 static char *envmatch(char *s1, char *s2) 381 { 382 if (s1 == NULL || s2 == NULL) 383 return NULL; 384 385 while (*s1 == *s2++) 386 if (*s1++ == '=') 387 return s2; 388 if (*s1 == '\0' && *(s2 - 1) == '=') 389 return s2; 390 return NULL; 391 } 392 393 /** 394 * Search the environment for a variable. 395 * Return the value, if found, or NULL, if not found. 396 */ 397 char *fw_getenv (char *name) 398 { 399 char *env, *nxt; 400 401 for (env = environment.data; *env; env = nxt + 1) { 402 char *val; 403 404 for (nxt = env; *nxt; ++nxt) { 405 if (nxt >= &environment.data[ENV_SIZE]) { 406 fprintf (stderr, "## Error: " 407 "environment not terminated\n"); 408 return NULL; 409 } 410 } 411 val = envmatch (name, env); 412 if (!val) 413 continue; 414 return val; 415 } 416 return NULL; 417 } 418 419 /* 420 * Search the default environment for a variable. 421 * Return the value, if found, or NULL, if not found. 422 */ 423 char *fw_getdefenv(char *name) 424 { 425 char *env, *nxt; 426 427 for (env = default_environment; *env; env = nxt + 1) { 428 char *val; 429 430 for (nxt = env; *nxt; ++nxt) { 431 if (nxt >= &default_environment[ENV_SIZE]) { 432 fprintf(stderr, "## Error: " 433 "default environment not terminated\n"); 434 return NULL; 435 } 436 } 437 val = envmatch(name, env); 438 if (!val) 439 continue; 440 return val; 441 } 442 return NULL; 443 } 444 445 /* 446 * Print the current definition of one, or more, or all 447 * environment variables 448 */ 449 int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts) 450 { 451 int i, rc = 0; 452 453 if (value_only && argc != 1) { 454 fprintf(stderr, 455 "## Error: `-n' option requires exactly one argument\n"); 456 return -1; 457 } 458 459 if (!opts) 460 opts = &default_opts; 461 462 if (fw_env_open(opts)) 463 return -1; 464 465 if (argc == 0) { /* Print all env variables */ 466 char *env, *nxt; 467 for (env = environment.data; *env; env = nxt + 1) { 468 for (nxt = env; *nxt; ++nxt) { 469 if (nxt >= &environment.data[ENV_SIZE]) { 470 fprintf (stderr, "## Error: " 471 "environment not terminated\n"); 472 return -1; 473 } 474 } 475 476 printf ("%s\n", env); 477 } 478 fw_env_close(opts); 479 return 0; 480 } 481 482 for (i = 0; i < argc; ++i) { /* print a subset of env variables */ 483 char *name = argv[i]; 484 char *val = NULL; 485 486 val = fw_getenv(name); 487 if (!val) { 488 fprintf (stderr, "## Error: \"%s\" not defined\n", name); 489 rc = -1; 490 continue; 491 } 492 493 if (value_only) { 494 puts(val); 495 break; 496 } 497 498 printf("%s=%s\n", name, val); 499 } 500 501 fw_env_close(opts); 502 503 return rc; 504 } 505 506 int fw_env_flush(struct env_opts *opts) 507 { 508 if (!opts) 509 opts = &default_opts; 510 511 /* 512 * Update CRC 513 */ 514 *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE); 515 516 /* write environment back to flash */ 517 if (flash_io(O_RDWR)) { 518 fprintf(stderr, 519 "Error: can't write fw_env to flash\n"); 520 return -1; 521 } 522 523 return 0; 524 } 525 526 527 /* 528 * Set/Clear a single variable in the environment. 529 * This is called in sequence to update the environment 530 * in RAM without updating the copy in flash after each set 531 */ 532 int fw_env_write(char *name, char *value) 533 { 534 int len; 535 char *env, *nxt; 536 char *oldval = NULL; 537 int deleting, creating, overwriting; 538 539 /* 540 * search if variable with this name already exists 541 */ 542 for (nxt = env = environment.data; *env; env = nxt + 1) { 543 for (nxt = env; *nxt; ++nxt) { 544 if (nxt >= &environment.data[ENV_SIZE]) { 545 fprintf(stderr, "## Error: " 546 "environment not terminated\n"); 547 errno = EINVAL; 548 return -1; 549 } 550 } 551 if ((oldval = envmatch (name, env)) != NULL) 552 break; 553 } 554 555 deleting = (oldval && !(value && strlen(value))); 556 creating = (!oldval && (value && strlen(value))); 557 overwriting = (oldval && (value && strlen(value))); 558 559 /* check for permission */ 560 if (deleting) { 561 if (env_flags_validate_varaccess(name, 562 ENV_FLAGS_VARACCESS_PREVENT_DELETE)) { 563 printf("Can't delete \"%s\"\n", name); 564 errno = EROFS; 565 return -1; 566 } 567 } else if (overwriting) { 568 if (env_flags_validate_varaccess(name, 569 ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) { 570 printf("Can't overwrite \"%s\"\n", name); 571 errno = EROFS; 572 return -1; 573 } else if (env_flags_validate_varaccess(name, 574 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) { 575 const char *defval = fw_getdefenv(name); 576 577 if (defval == NULL) 578 defval = ""; 579 if (strcmp(oldval, defval) 580 != 0) { 581 printf("Can't overwrite \"%s\"\n", name); 582 errno = EROFS; 583 return -1; 584 } 585 } 586 } else if (creating) { 587 if (env_flags_validate_varaccess(name, 588 ENV_FLAGS_VARACCESS_PREVENT_CREATE)) { 589 printf("Can't create \"%s\"\n", name); 590 errno = EROFS; 591 return -1; 592 } 593 } else 594 /* Nothing to do */ 595 return 0; 596 597 if (deleting || overwriting) { 598 if (*++nxt == '\0') { 599 *env = '\0'; 600 } else { 601 for (;;) { 602 *env = *nxt++; 603 if ((*env == '\0') && (*nxt == '\0')) 604 break; 605 ++env; 606 } 607 } 608 *++env = '\0'; 609 } 610 611 /* Delete only ? */ 612 if (!value || !strlen(value)) 613 return 0; 614 615 /* 616 * Append new definition at the end 617 */ 618 for (env = environment.data; *env || *(env + 1); ++env); 619 if (env > environment.data) 620 ++env; 621 /* 622 * Overflow when: 623 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment) 624 */ 625 len = strlen (name) + 2; 626 /* add '=' for first arg, ' ' for all others */ 627 len += strlen(value) + 1; 628 629 if (len > (&environment.data[ENV_SIZE] - env)) { 630 fprintf (stderr, 631 "Error: environment overflow, \"%s\" deleted\n", 632 name); 633 return -1; 634 } 635 636 while ((*env = *name++) != '\0') 637 env++; 638 *env = '='; 639 while ((*++env = *value++) != '\0') 640 ; 641 642 /* end is marked with double '\0' */ 643 *++env = '\0'; 644 645 return 0; 646 } 647 648 /* 649 * Deletes or sets environment variables. Returns -1 and sets errno error codes: 650 * 0 - OK 651 * EINVAL - need at least 1 argument 652 * EROFS - certain variables ("ethaddr", "serial#") cannot be 653 * modified or deleted 654 * 655 */ 656 int fw_env_set(int argc, char *argv[], struct env_opts *opts) 657 { 658 int i; 659 size_t len; 660 char *name, **valv; 661 char *oldval; 662 char *value = NULL; 663 int valc; 664 int ret; 665 666 if (!opts) 667 opts = &default_opts; 668 669 if (argc < 1) { 670 fprintf(stderr, "## Error: variable name missing\n"); 671 errno = EINVAL; 672 return -1; 673 } 674 675 if (fw_env_open(opts)) { 676 fprintf(stderr, "Error: environment not initialized\n"); 677 return -1; 678 } 679 680 name = argv[0]; 681 valv = argv + 1; 682 valc = argc - 1; 683 684 if (env_flags_validate_env_set_params(name, valv, valc) < 0) { 685 fw_env_close(opts); 686 return -1; 687 } 688 689 len = 0; 690 for (i = 0; i < valc; ++i) { 691 char *val = valv[i]; 692 size_t val_len = strlen(val); 693 694 if (value) 695 value[len - 1] = ' '; 696 oldval = value; 697 value = realloc(value, len + val_len + 1); 698 if (!value) { 699 fprintf(stderr, 700 "Cannot malloc %zu bytes: %s\n", 701 len, strerror(errno)); 702 free(oldval); 703 return -1; 704 } 705 706 memcpy(value + len, val, val_len); 707 len += val_len; 708 value[len++] = '\0'; 709 } 710 711 fw_env_write(name, value); 712 713 free(value); 714 715 ret = fw_env_flush(opts); 716 fw_env_close(opts); 717 718 return ret; 719 } 720 721 /* 722 * Parse a file and configure the u-boot variables. 723 * The script file has a very simple format, as follows: 724 * 725 * Each line has a couple with name, value: 726 * <white spaces>variable_name<white spaces>variable_value 727 * 728 * Both variable_name and variable_value are interpreted as strings. 729 * Any character after <white spaces> and before ending \r\n is interpreted 730 * as variable's value (no comment allowed on these lines !) 731 * 732 * Comments are allowed if the first character in the line is # 733 * 734 * Returns -1 and sets errno error codes: 735 * 0 - OK 736 * -1 - Error 737 */ 738 int fw_parse_script(char *fname, struct env_opts *opts) 739 { 740 FILE *fp; 741 char dump[1024]; /* Maximum line length in the file */ 742 char *name; 743 char *val; 744 int lineno = 0; 745 int len; 746 int ret = 0; 747 748 if (!opts) 749 opts = &default_opts; 750 751 if (fw_env_open(opts)) { 752 fprintf(stderr, "Error: environment not initialized\n"); 753 return -1; 754 } 755 756 if (strcmp(fname, "-") == 0) 757 fp = stdin; 758 else { 759 fp = fopen(fname, "r"); 760 if (fp == NULL) { 761 fprintf(stderr, "I cannot open %s for reading\n", 762 fname); 763 return -1; 764 } 765 } 766 767 while (fgets(dump, sizeof(dump), fp)) { 768 lineno++; 769 len = strlen(dump); 770 771 /* 772 * Read a whole line from the file. If the line is too long 773 * or is not terminated, reports an error and exit. 774 */ 775 if (dump[len - 1] != '\n') { 776 fprintf(stderr, 777 "Line %d not corrected terminated or too long\n", 778 lineno); 779 ret = -1; 780 break; 781 } 782 783 /* Drop ending line feed / carriage return */ 784 dump[--len] = '\0'; 785 if (len && dump[len - 1] == '\r') 786 dump[--len] = '\0'; 787 788 /* Skip comment or empty lines */ 789 if (len == 0 || dump[0] == '#') 790 continue; 791 792 /* 793 * Search for variable's name, 794 * remove leading whitespaces 795 */ 796 name = skip_blanks(dump); 797 if (!name) 798 continue; 799 800 /* The first white space is the end of variable name */ 801 val = skip_chars(name); 802 len = strlen(name); 803 if (val) { 804 *val++ = '\0'; 805 if ((val - name) < len) 806 val = skip_blanks(val); 807 else 808 val = NULL; 809 } 810 811 #ifdef DEBUG 812 fprintf(stderr, "Setting %s : %s\n", 813 name, val ? val : " removed"); 814 #endif 815 816 if (env_flags_validate_type(name, val) < 0) { 817 ret = -1; 818 break; 819 } 820 821 /* 822 * If there is an error setting a variable, 823 * try to save the environment and returns an error 824 */ 825 if (fw_env_write(name, val)) { 826 fprintf(stderr, 827 "fw_env_write returns with error : %s\n", 828 strerror(errno)); 829 ret = -1; 830 break; 831 } 832 833 } 834 835 /* Close file if not stdin */ 836 if (strcmp(fname, "-") != 0) 837 fclose(fp); 838 839 ret |= fw_env_flush(opts); 840 841 fw_env_close(opts); 842 843 return ret; 844 } 845 846 /** 847 * environment_end() - compute offset of first byte right after environemnt 848 * @dev - index of enviroment buffer 849 * Return: 850 * device offset of first byte right after environemnt 851 */ 852 off_t environment_end(int dev) 853 { 854 /* environment is block aligned */ 855 return DEVOFFSET(dev) + ENVSECTORS(dev) * DEVESIZE(dev); 856 } 857 858 /* 859 * Test for bad block on NAND, just returns 0 on NOR, on NAND: 860 * 0 - block is good 861 * > 0 - block is bad 862 * < 0 - failed to test 863 */ 864 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t blockstart) 865 { 866 if (mtd_type == MTD_NANDFLASH) { 867 int badblock = ioctl(fd, MEMGETBADBLOCK, &blockstart); 868 869 if (badblock < 0) { 870 perror ("Cannot read bad block mark"); 871 return badblock; 872 } 873 874 if (badblock) { 875 #ifdef DEBUG 876 fprintf (stderr, "Bad block at 0x%llx, skipping\n", 877 (unsigned long long)blockstart); 878 #endif 879 return badblock; 880 } 881 } 882 883 return 0; 884 } 885 886 /* 887 * Read data from flash at an offset into a provided buffer. On NAND it skips 888 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from 889 * the DEVOFFSET (dev) block. On NOR the loop is only run once. 890 */ 891 static int flash_read_buf (int dev, int fd, void *buf, size_t count, 892 off_t offset) 893 { 894 size_t blocklen; /* erase / write length - one block on NAND, 895 0 on NOR */ 896 size_t processed = 0; /* progress counter */ 897 size_t readlen = count; /* current read length */ 898 off_t block_seek; /* offset inside the current block to the start 899 of the data */ 900 loff_t blockstart; /* running start of the current block - 901 MEMGETBADBLOCK needs 64 bits */ 902 int rc; 903 904 blockstart = (offset / DEVESIZE (dev)) * DEVESIZE (dev); 905 906 /* Offset inside a block */ 907 block_seek = offset - blockstart; 908 909 if (DEVTYPE(dev) == MTD_NANDFLASH) { 910 /* 911 * NAND: calculate which blocks we are reading. We have 912 * to read one block at a time to skip bad blocks. 913 */ 914 blocklen = DEVESIZE (dev); 915 916 /* Limit to one block for the first read */ 917 if (readlen > blocklen - block_seek) 918 readlen = blocklen - block_seek; 919 } else { 920 blocklen = 0; 921 } 922 923 /* This only runs once on NOR flash */ 924 while (processed < count) { 925 rc = flash_bad_block(fd, DEVTYPE(dev), blockstart); 926 if (rc < 0) /* block test failed */ 927 return -1; 928 929 if (blockstart + block_seek + readlen > environment_end(dev)) { 930 /* End of range is reached */ 931 fprintf (stderr, 932 "Too few good blocks within range\n"); 933 return -1; 934 } 935 936 if (rc) { /* block is bad */ 937 blockstart += blocklen; 938 continue; 939 } 940 941 /* 942 * If a block is bad, we retry in the next block at the same 943 * offset - see env/nand.c::writeenv() 944 */ 945 lseek (fd, blockstart + block_seek, SEEK_SET); 946 947 rc = read (fd, buf + processed, readlen); 948 if (rc != readlen) { 949 fprintf (stderr, "Read error on %s: %s\n", 950 DEVNAME (dev), strerror (errno)); 951 return -1; 952 } 953 #ifdef DEBUG 954 fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n", 955 rc, (unsigned long long) blockstart + block_seek, 956 DEVNAME(dev)); 957 #endif 958 processed += readlen; 959 readlen = min (blocklen, count - processed); 960 block_seek = 0; 961 blockstart += blocklen; 962 } 963 964 return processed; 965 } 966 967 /* 968 * Write count bytes from begin of environment, but stay within 969 * ENVSECTORS(dev) sectors of 970 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we 971 * erase and write the whole data at once. 972 */ 973 static int flash_write_buf(int dev, int fd, void *buf, size_t count) 974 { 975 void *data; 976 struct erase_info_user erase; 977 size_t blocklen; /* length of NAND block / NOR erase sector */ 978 size_t erase_len; /* whole area that can be erased - may include 979 bad blocks */ 980 size_t erasesize; /* erase / write length - one block on NAND, 981 whole area on NOR */ 982 size_t processed = 0; /* progress counter */ 983 size_t write_total; /* total size to actually write - excluding 984 bad blocks */ 985 off_t erase_offset; /* offset to the first erase block (aligned) 986 below offset */ 987 off_t block_seek; /* offset inside the erase block to the start 988 of the data */ 989 loff_t blockstart; /* running start of the current block - 990 MEMGETBADBLOCK needs 64 bits */ 991 int rc; 992 993 /* 994 * For mtd devices only offset and size of the environment do matter 995 */ 996 if (DEVTYPE(dev) == MTD_ABSENT) { 997 blocklen = count; 998 erase_len = blocklen; 999 blockstart = DEVOFFSET(dev); 1000 block_seek = 0; 1001 write_total = blocklen; 1002 } else { 1003 blocklen = DEVESIZE(dev); 1004 1005 erase_offset = DEVOFFSET(dev); 1006 1007 /* Maximum area we may use */ 1008 erase_len = environment_end(dev) - erase_offset; 1009 1010 blockstart = erase_offset; 1011 1012 /* Offset inside a block */ 1013 block_seek = DEVOFFSET(dev) - erase_offset; 1014 1015 /* 1016 * Data size we actually write: from the start of the block 1017 * to the start of the data, then count bytes of data, and 1018 * to the end of the block 1019 */ 1020 write_total = ((block_seek + count + blocklen - 1) / 1021 blocklen) * blocklen; 1022 } 1023 1024 /* 1025 * Support data anywhere within erase sectors: read out the complete 1026 * area to be erased, replace the environment image, write the whole 1027 * block back again. 1028 */ 1029 if (write_total > count) { 1030 data = malloc (erase_len); 1031 if (!data) { 1032 fprintf (stderr, 1033 "Cannot malloc %zu bytes: %s\n", 1034 erase_len, strerror (errno)); 1035 return -1; 1036 } 1037 1038 rc = flash_read_buf(dev, fd, data, write_total, erase_offset); 1039 if (write_total != rc) 1040 return -1; 1041 1042 #ifdef DEBUG 1043 fprintf(stderr, "Preserving data "); 1044 if (block_seek != 0) 1045 fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1); 1046 if (block_seek + count != write_total) { 1047 if (block_seek != 0) 1048 fprintf(stderr, " and "); 1049 fprintf(stderr, "0x%lx - 0x%lx", 1050 (unsigned long) block_seek + count, 1051 (unsigned long) write_total - 1); 1052 } 1053 fprintf(stderr, "\n"); 1054 #endif 1055 /* Overwrite the old environment */ 1056 memcpy (data + block_seek, buf, count); 1057 } else { 1058 /* 1059 * We get here, iff offset is block-aligned and count is a 1060 * multiple of blocklen - see write_total calculation above 1061 */ 1062 data = buf; 1063 } 1064 1065 if (DEVTYPE(dev) == MTD_NANDFLASH) { 1066 /* 1067 * NAND: calculate which blocks we are writing. We have 1068 * to write one block at a time to skip bad blocks. 1069 */ 1070 erasesize = blocklen; 1071 } else { 1072 erasesize = erase_len; 1073 } 1074 1075 erase.length = erasesize; 1076 1077 /* This only runs once on NOR flash and SPI-dataflash */ 1078 while (processed < write_total) { 1079 rc = flash_bad_block(fd, DEVTYPE(dev), blockstart); 1080 if (rc < 0) /* block test failed */ 1081 return rc; 1082 1083 if (blockstart + erasesize > environment_end(dev)) { 1084 fprintf (stderr, "End of range reached, aborting\n"); 1085 return -1; 1086 } 1087 1088 if (rc) { /* block is bad */ 1089 blockstart += blocklen; 1090 continue; 1091 } 1092 1093 if (DEVTYPE(dev) != MTD_ABSENT) { 1094 erase.start = blockstart; 1095 ioctl(fd, MEMUNLOCK, &erase); 1096 /* These do not need an explicit erase cycle */ 1097 if (DEVTYPE(dev) != MTD_DATAFLASH) 1098 if (ioctl(fd, MEMERASE, &erase) != 0) { 1099 fprintf(stderr, 1100 "MTD erase error on %s: %s\n", 1101 DEVNAME(dev), strerror(errno)); 1102 return -1; 1103 } 1104 } 1105 1106 if (lseek (fd, blockstart, SEEK_SET) == -1) { 1107 fprintf (stderr, 1108 "Seek error on %s: %s\n", 1109 DEVNAME (dev), strerror (errno)); 1110 return -1; 1111 } 1112 1113 #ifdef DEBUG 1114 fprintf(stderr, "Write 0x%llx bytes at 0x%llx\n", 1115 (unsigned long long) erasesize, 1116 (unsigned long long) blockstart); 1117 #endif 1118 if (write (fd, data + processed, erasesize) != erasesize) { 1119 fprintf (stderr, "Write error on %s: %s\n", 1120 DEVNAME (dev), strerror (errno)); 1121 return -1; 1122 } 1123 1124 if (DEVTYPE(dev) != MTD_ABSENT) 1125 ioctl(fd, MEMLOCK, &erase); 1126 1127 processed += erasesize; 1128 block_seek = 0; 1129 blockstart += erasesize; 1130 } 1131 1132 if (write_total > count) 1133 free (data); 1134 1135 return processed; 1136 } 1137 1138 /* 1139 * Set obsolete flag at offset - NOR flash only 1140 */ 1141 static int flash_flag_obsolete (int dev, int fd, off_t offset) 1142 { 1143 int rc; 1144 struct erase_info_user erase; 1145 1146 erase.start = DEVOFFSET (dev); 1147 erase.length = DEVESIZE (dev); 1148 /* This relies on the fact, that obsolete_flag == 0 */ 1149 rc = lseek (fd, offset, SEEK_SET); 1150 if (rc < 0) { 1151 fprintf (stderr, "Cannot seek to set the flag on %s \n", 1152 DEVNAME (dev)); 1153 return rc; 1154 } 1155 ioctl (fd, MEMUNLOCK, &erase); 1156 rc = write (fd, &obsolete_flag, sizeof (obsolete_flag)); 1157 ioctl (fd, MEMLOCK, &erase); 1158 if (rc < 0) 1159 perror ("Could not set obsolete flag"); 1160 1161 return rc; 1162 } 1163 1164 static int flash_write (int fd_current, int fd_target, int dev_target) 1165 { 1166 int rc; 1167 1168 switch (environment.flag_scheme) { 1169 case FLAG_NONE: 1170 break; 1171 case FLAG_INCREMENTAL: 1172 (*environment.flags)++; 1173 break; 1174 case FLAG_BOOLEAN: 1175 *environment.flags = active_flag; 1176 break; 1177 default: 1178 fprintf (stderr, "Unimplemented flash scheme %u \n", 1179 environment.flag_scheme); 1180 return -1; 1181 } 1182 1183 #ifdef DEBUG 1184 fprintf(stderr, "Writing new environment at 0x%llx on %s\n", 1185 DEVOFFSET (dev_target), DEVNAME (dev_target)); 1186 #endif 1187 1188 if (IS_UBI(dev_target)) { 1189 if (ubi_update_start(fd_target, CUR_ENVSIZE) < 0) 1190 return 0; 1191 return ubi_write(fd_target, environment.image, CUR_ENVSIZE); 1192 } 1193 1194 rc = flash_write_buf(dev_target, fd_target, environment.image, 1195 CUR_ENVSIZE); 1196 if (rc < 0) 1197 return rc; 1198 1199 if (environment.flag_scheme == FLAG_BOOLEAN) { 1200 /* Have to set obsolete flag */ 1201 off_t offset = DEVOFFSET (dev_current) + 1202 offsetof (struct env_image_redundant, flags); 1203 #ifdef DEBUG 1204 fprintf(stderr, 1205 "Setting obsolete flag in environment at 0x%llx on %s\n", 1206 DEVOFFSET (dev_current), DEVNAME (dev_current)); 1207 #endif 1208 flash_flag_obsolete (dev_current, fd_current, offset); 1209 } 1210 1211 return 0; 1212 } 1213 1214 static int flash_read (int fd) 1215 { 1216 int rc; 1217 1218 if (IS_UBI(dev_current)) { 1219 DEVTYPE(dev_current) = MTD_ABSENT; 1220 1221 return ubi_read(fd, environment.image, CUR_ENVSIZE); 1222 } 1223 1224 rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE, 1225 DEVOFFSET(dev_current)); 1226 if (rc != CUR_ENVSIZE) 1227 return -1; 1228 1229 return 0; 1230 } 1231 1232 static int flash_io (int mode) 1233 { 1234 int fd_current, fd_target, rc, dev_target; 1235 1236 /* dev_current: fd_current, erase_current */ 1237 fd_current = open (DEVNAME (dev_current), mode); 1238 if (fd_current < 0) { 1239 fprintf (stderr, 1240 "Can't open %s: %s\n", 1241 DEVNAME (dev_current), strerror (errno)); 1242 return -1; 1243 } 1244 1245 if (mode == O_RDWR) { 1246 if (HaveRedundEnv) { 1247 /* switch to next partition for writing */ 1248 dev_target = !dev_current; 1249 /* dev_target: fd_target, erase_target */ 1250 fd_target = open (DEVNAME (dev_target), mode); 1251 if (fd_target < 0) { 1252 fprintf (stderr, 1253 "Can't open %s: %s\n", 1254 DEVNAME (dev_target), 1255 strerror (errno)); 1256 rc = -1; 1257 goto exit; 1258 } 1259 } else { 1260 dev_target = dev_current; 1261 fd_target = fd_current; 1262 } 1263 1264 rc = flash_write (fd_current, fd_target, dev_target); 1265 1266 if (fsync(fd_current) && 1267 !(errno == EINVAL || errno == EROFS)) { 1268 fprintf (stderr, 1269 "fsync failed on %s: %s\n", 1270 DEVNAME (dev_current), strerror (errno)); 1271 } 1272 1273 if (HaveRedundEnv) { 1274 if (fsync(fd_target) && 1275 !(errno == EINVAL || errno == EROFS)) { 1276 fprintf (stderr, 1277 "fsync failed on %s: %s\n", 1278 DEVNAME (dev_current), strerror (errno)); 1279 } 1280 1281 if (close (fd_target)) { 1282 fprintf (stderr, 1283 "I/O error on %s: %s\n", 1284 DEVNAME (dev_target), 1285 strerror (errno)); 1286 rc = -1; 1287 } 1288 } 1289 } else { 1290 rc = flash_read (fd_current); 1291 } 1292 1293 exit: 1294 if (close (fd_current)) { 1295 fprintf (stderr, 1296 "I/O error on %s: %s\n", 1297 DEVNAME (dev_current), strerror (errno)); 1298 return -1; 1299 } 1300 1301 return rc; 1302 } 1303 1304 /* 1305 * Prevent confusion if running from erased flash memory 1306 */ 1307 int fw_env_open(struct env_opts *opts) 1308 { 1309 int crc0, crc0_ok; 1310 unsigned char flag0; 1311 void *addr0 = NULL; 1312 1313 int crc1, crc1_ok; 1314 unsigned char flag1; 1315 void *addr1 = NULL; 1316 1317 int ret; 1318 1319 struct env_image_single *single; 1320 struct env_image_redundant *redundant; 1321 1322 if (!opts) 1323 opts = &default_opts; 1324 1325 if (parse_config(opts)) /* should fill envdevices */ 1326 return -EINVAL; 1327 1328 addr0 = calloc(1, CUR_ENVSIZE); 1329 if (addr0 == NULL) { 1330 fprintf(stderr, 1331 "Not enough memory for environment (%ld bytes)\n", 1332 CUR_ENVSIZE); 1333 ret = -ENOMEM; 1334 goto open_cleanup; 1335 } 1336 1337 /* read environment from FLASH to local buffer */ 1338 environment.image = addr0; 1339 1340 if (HaveRedundEnv) { 1341 redundant = addr0; 1342 environment.crc = &redundant->crc; 1343 environment.flags = &redundant->flags; 1344 environment.data = redundant->data; 1345 } else { 1346 single = addr0; 1347 environment.crc = &single->crc; 1348 environment.flags = NULL; 1349 environment.data = single->data; 1350 } 1351 1352 dev_current = 0; 1353 if (flash_io(O_RDONLY)) { 1354 ret = -EIO; 1355 goto open_cleanup; 1356 } 1357 1358 crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE); 1359 1360 crc0_ok = (crc0 == *environment.crc); 1361 if (!HaveRedundEnv) { 1362 if (!crc0_ok) { 1363 fprintf (stderr, 1364 "Warning: Bad CRC, using default environment\n"); 1365 memcpy(environment.data, default_environment, sizeof default_environment); 1366 } 1367 } else { 1368 flag0 = *environment.flags; 1369 1370 dev_current = 1; 1371 addr1 = calloc(1, CUR_ENVSIZE); 1372 if (addr1 == NULL) { 1373 fprintf(stderr, 1374 "Not enough memory for environment (%ld bytes)\n", 1375 CUR_ENVSIZE); 1376 ret = -ENOMEM; 1377 goto open_cleanup; 1378 } 1379 redundant = addr1; 1380 1381 /* 1382 * have to set environment.image for flash_read(), careful - 1383 * other pointers in environment still point inside addr0 1384 */ 1385 environment.image = addr1; 1386 if (flash_io(O_RDONLY)) { 1387 ret = -EIO; 1388 goto open_cleanup; 1389 } 1390 1391 /* Check flag scheme compatibility */ 1392 if (DEVTYPE(dev_current) == MTD_NORFLASH && 1393 DEVTYPE(!dev_current) == MTD_NORFLASH) { 1394 environment.flag_scheme = FLAG_BOOLEAN; 1395 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH && 1396 DEVTYPE(!dev_current) == MTD_NANDFLASH) { 1397 environment.flag_scheme = FLAG_INCREMENTAL; 1398 } else if (DEVTYPE(dev_current) == MTD_DATAFLASH && 1399 DEVTYPE(!dev_current) == MTD_DATAFLASH) { 1400 environment.flag_scheme = FLAG_BOOLEAN; 1401 } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME && 1402 DEVTYPE(!dev_current) == MTD_UBIVOLUME) { 1403 environment.flag_scheme = FLAG_INCREMENTAL; 1404 } else if (DEVTYPE(dev_current) == MTD_ABSENT && 1405 DEVTYPE(!dev_current) == MTD_ABSENT && 1406 IS_UBI(dev_current) == IS_UBI(!dev_current)) { 1407 environment.flag_scheme = FLAG_INCREMENTAL; 1408 } else { 1409 fprintf (stderr, "Incompatible flash types!\n"); 1410 ret = -EINVAL; 1411 goto open_cleanup; 1412 } 1413 1414 crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE); 1415 1416 crc1_ok = (crc1 == redundant->crc); 1417 flag1 = redundant->flags; 1418 1419 if (crc0_ok && !crc1_ok) { 1420 dev_current = 0; 1421 } else if (!crc0_ok && crc1_ok) { 1422 dev_current = 1; 1423 } else if (!crc0_ok && !crc1_ok) { 1424 fprintf (stderr, 1425 "Warning: Bad CRC, using default environment\n"); 1426 memcpy (environment.data, default_environment, 1427 sizeof default_environment); 1428 dev_current = 0; 1429 } else { 1430 switch (environment.flag_scheme) { 1431 case FLAG_BOOLEAN: 1432 if (flag0 == active_flag && 1433 flag1 == obsolete_flag) { 1434 dev_current = 0; 1435 } else if (flag0 == obsolete_flag && 1436 flag1 == active_flag) { 1437 dev_current = 1; 1438 } else if (flag0 == flag1) { 1439 dev_current = 0; 1440 } else if (flag0 == 0xFF) { 1441 dev_current = 0; 1442 } else if (flag1 == 0xFF) { 1443 dev_current = 1; 1444 } else { 1445 dev_current = 0; 1446 } 1447 break; 1448 case FLAG_INCREMENTAL: 1449 if (flag0 == 255 && flag1 == 0) 1450 dev_current = 1; 1451 else if ((flag1 == 255 && flag0 == 0) || 1452 flag0 >= flag1) 1453 dev_current = 0; 1454 else /* flag1 > flag0 */ 1455 dev_current = 1; 1456 break; 1457 default: 1458 fprintf (stderr, "Unknown flag scheme %u \n", 1459 environment.flag_scheme); 1460 return -1; 1461 } 1462 } 1463 1464 /* 1465 * If we are reading, we don't need the flag and the CRC any 1466 * more, if we are writing, we will re-calculate CRC and update 1467 * flags before writing out 1468 */ 1469 if (dev_current) { 1470 environment.image = addr1; 1471 environment.crc = &redundant->crc; 1472 environment.flags = &redundant->flags; 1473 environment.data = redundant->data; 1474 free (addr0); 1475 } else { 1476 environment.image = addr0; 1477 /* Other pointers are already set */ 1478 free (addr1); 1479 } 1480 #ifdef DEBUG 1481 fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current)); 1482 #endif 1483 } 1484 return 0; 1485 1486 open_cleanup: 1487 if (addr0) 1488 free(addr0); 1489 1490 if (addr1) 1491 free(addr0); 1492 1493 return ret; 1494 } 1495 1496 /* 1497 * Simply free allocated buffer with environment 1498 */ 1499 int fw_env_close(struct env_opts *opts) 1500 { 1501 if (environment.image) 1502 free(environment.image); 1503 1504 environment.image = NULL; 1505 1506 return 0; 1507 } 1508 1509 static int check_device_config(int dev) 1510 { 1511 struct stat st; 1512 int32_t lnum = 0; 1513 int fd, rc = 0; 1514 1515 /* Fills in IS_UBI(), converts DEVNAME() with ubi volume name */ 1516 ubi_check_dev(dev); 1517 1518 fd = open(DEVNAME(dev), O_RDONLY); 1519 if (fd < 0) { 1520 fprintf(stderr, 1521 "Cannot open %s: %s\n", 1522 DEVNAME(dev), strerror(errno)); 1523 return -1; 1524 } 1525 1526 rc = fstat(fd, &st); 1527 if (rc < 0) { 1528 fprintf(stderr, "Cannot stat the file %s\n", 1529 DEVNAME(dev)); 1530 goto err; 1531 } 1532 1533 if (IS_UBI(dev)) { 1534 rc = ioctl(fd, UBI_IOCEBISMAP, &lnum); 1535 if (rc < 0) { 1536 fprintf(stderr, "Cannot get UBI information for %s\n", 1537 DEVNAME(dev)); 1538 goto err; 1539 } 1540 } else if (S_ISCHR(st.st_mode)) { 1541 struct mtd_info_user mtdinfo; 1542 rc = ioctl(fd, MEMGETINFO, &mtdinfo); 1543 if (rc < 0) { 1544 fprintf(stderr, "Cannot get MTD information for %s\n", 1545 DEVNAME(dev)); 1546 goto err; 1547 } 1548 if (mtdinfo.type != MTD_NORFLASH && 1549 mtdinfo.type != MTD_NANDFLASH && 1550 mtdinfo.type != MTD_DATAFLASH && 1551 mtdinfo.type != MTD_UBIVOLUME) { 1552 fprintf(stderr, "Unsupported flash type %u on %s\n", 1553 mtdinfo.type, DEVNAME(dev)); 1554 goto err; 1555 } 1556 DEVTYPE(dev) = mtdinfo.type; 1557 if (DEVESIZE(dev) == 0) 1558 /* Assume the erase size is the same as the env-size */ 1559 DEVESIZE(dev) = ENVSIZE(dev); 1560 } else { 1561 uint64_t size; 1562 DEVTYPE(dev) = MTD_ABSENT; 1563 if (DEVESIZE(dev) == 0) 1564 /* Assume the erase size to be 512 bytes */ 1565 DEVESIZE(dev) = 0x200; 1566 1567 /* 1568 * Check for negative offsets, treat it as backwards offset 1569 * from the end of the block device 1570 */ 1571 if (DEVOFFSET(dev) < 0) { 1572 rc = ioctl(fd, BLKGETSIZE64, &size); 1573 if (rc < 0) { 1574 fprintf(stderr, "Could not get block device size on %s\n", 1575 DEVNAME(dev)); 1576 goto err; 1577 } 1578 1579 DEVOFFSET(dev) = DEVOFFSET(dev) + size; 1580 #ifdef DEBUG 1581 fprintf(stderr, "Calculated device offset 0x%llx on %s\n", 1582 DEVOFFSET(dev), DEVNAME(dev)); 1583 #endif 1584 } 1585 } 1586 1587 if (ENVSECTORS(dev) == 0) 1588 /* Assume enough sectors to cover the environment */ 1589 ENVSECTORS(dev) = DIV_ROUND_UP(ENVSIZE(dev), DEVESIZE(dev)); 1590 1591 if (DEVOFFSET(dev) % DEVESIZE(dev) != 0) { 1592 fprintf(stderr, "Environment does not start on (erase) block boundary\n"); 1593 errno = EINVAL; 1594 return -1; 1595 } 1596 1597 if (ENVSIZE(dev) > ENVSECTORS(dev) * DEVESIZE(dev)) { 1598 fprintf(stderr, "Environment does not fit into available sectors\n"); 1599 errno = EINVAL; 1600 return -1; 1601 } 1602 1603 err: 1604 close(fd); 1605 return rc; 1606 } 1607 1608 static int parse_config(struct env_opts *opts) 1609 { 1610 int rc; 1611 1612 if (!opts) 1613 opts = &default_opts; 1614 1615 #if defined(CONFIG_FILE) 1616 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */ 1617 if (get_config(opts->config_file)) { 1618 fprintf(stderr, "Cannot parse config file '%s': %m\n", 1619 opts->config_file); 1620 return -1; 1621 } 1622 #else 1623 DEVNAME (0) = DEVICE1_NAME; 1624 DEVOFFSET (0) = DEVICE1_OFFSET; 1625 ENVSIZE (0) = ENV1_SIZE; 1626 1627 /* Set defaults for DEVESIZE, ENVSECTORS later once we 1628 * know DEVTYPE 1629 */ 1630 #ifdef DEVICE1_ESIZE 1631 DEVESIZE (0) = DEVICE1_ESIZE; 1632 #endif 1633 #ifdef DEVICE1_ENVSECTORS 1634 ENVSECTORS (0) = DEVICE1_ENVSECTORS; 1635 #endif 1636 1637 #ifdef HAVE_REDUND 1638 DEVNAME (1) = DEVICE2_NAME; 1639 DEVOFFSET (1) = DEVICE2_OFFSET; 1640 ENVSIZE (1) = ENV2_SIZE; 1641 1642 /* Set defaults for DEVESIZE, ENVSECTORS later once we 1643 * know DEVTYPE 1644 */ 1645 #ifdef DEVICE2_ESIZE 1646 DEVESIZE (1) = DEVICE2_ESIZE; 1647 #endif 1648 #ifdef DEVICE2_ENVSECTORS 1649 ENVSECTORS (1) = DEVICE2_ENVSECTORS; 1650 #endif 1651 HaveRedundEnv = 1; 1652 #endif 1653 #endif 1654 rc = check_device_config(0); 1655 if (rc < 0) 1656 return rc; 1657 1658 if (HaveRedundEnv) { 1659 rc = check_device_config(1); 1660 if (rc < 0) 1661 return rc; 1662 1663 if (ENVSIZE(0) != ENVSIZE(1)) { 1664 fprintf(stderr, 1665 "Redundant environments have unequal size"); 1666 return -1; 1667 } 1668 } 1669 1670 usable_envsize = CUR_ENVSIZE - sizeof(uint32_t); 1671 if (HaveRedundEnv) 1672 usable_envsize -= sizeof(char); 1673 1674 return 0; 1675 } 1676 1677 #if defined(CONFIG_FILE) 1678 static int get_config (char *fname) 1679 { 1680 FILE *fp; 1681 int i = 0; 1682 int rc; 1683 char dump[128]; 1684 char *devname; 1685 1686 fp = fopen (fname, "r"); 1687 if (fp == NULL) 1688 return -1; 1689 1690 while (i < 2 && fgets (dump, sizeof (dump), fp)) { 1691 /* Skip incomplete conversions and comment strings */ 1692 if (dump[0] == '#') 1693 continue; 1694 1695 rc = sscanf(dump, "%ms %lli %lx %lx %lx", 1696 &devname, 1697 &DEVOFFSET(i), 1698 &ENVSIZE(i), 1699 &DEVESIZE(i), 1700 &ENVSECTORS(i)); 1701 1702 if (rc < 3) 1703 continue; 1704 1705 DEVNAME(i) = devname; 1706 1707 /* Set defaults for DEVESIZE, ENVSECTORS later once we 1708 * know DEVTYPE 1709 */ 1710 1711 i++; 1712 } 1713 fclose (fp); 1714 1715 HaveRedundEnv = i - 1; 1716 if (!i) { /* No valid entries found */ 1717 errno = EINVAL; 1718 return -1; 1719 } else 1720 return 0; 1721 } 1722 #endif 1723