util/kconfig/confdata.c

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #include <sys/stat.h>
   7 #include <ctype.h>
   8 #include <fcntl.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <time.h>
  13 #include <unistd.h>
  14
  15 #define LKC_DIRECT_LINK
  16 #include "lkc.h"
  17
  18 #ifdef WIN32
  19 #define mkdir(x,y) mkdir(x)
  20 #define UNLINK_IF_NECESSARY(x) unlink(x)
  21 #else
  22 #define UNLINK_IF_NECESSARY(X)
  23 #endif
  24
  25 static void conf_warning(const char *fmt, ...)
  26         __attribute__ ((format (printf, 1, 2)));
  27
  28 static const char *conf_filename;
  29 static int conf_lineno, conf_warnings, conf_unsaved;
  30
  31 const char conf_defname[] = "arch/$ARCH/defconfig";
  32
  33 static void conf_warning(const char *fmt, ...)
  34 {
  35         va_list ap;
  36         va_start(ap, fmt);
  37         fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
  38         vfprintf(stderr, fmt, ap);
  39         fprintf(stderr, "\n");
  40         va_end(ap);
  41         conf_warnings++;
  42 }
  43
  44 const char *conf_get_configname(void)
  45 {
  46         char *name = getenv("KCONFIG_CONFIG");
  47
  48         return name ? name : ".config";
  49 }
  50
  51 static char *conf_expand_value(const char *in)
  52 {
  53         struct symbol *sym;
  54         const char *src;
  55         static char res_value[SYMBOL_MAXLENGTH];
  56         char *dst, name[SYMBOL_MAXLENGTH];
  57
  58         res_value[0] = 0;
  59         dst = name;
  60         while ((src = strchr(in, '$'))) {
  61                 strncat(res_value, in, src - in);
  62                 src++;
  63                 dst = name;
  64                 while (isalnum(*src) || *src == '_')
  65                         *dst++ = *src++;
  66                 *dst = 0;
  67                 sym = sym_lookup(name, 0);
  68                 sym_calc_value(sym);
  69                 strcat(res_value, sym_get_string_value(sym));
  70                 in = src;
  71         }
  72         strcat(res_value, in);
  73
  74         return res_value;
  75 }
  76
  77 char *conf_get_default_confname(void)
  78 {
  79         struct stat buf;
  80         static char fullname[PATH_MAX+1];
  81         char *env, *name;
  82
  83         name = conf_expand_value(conf_defname);
  84         env = getenv(SRCTREE);
  85         if (env) {
  86                 sprintf(fullname, "%s/%s", env, name);
  87                 if (!stat(fullname, &buf))
  88                         return fullname;
  89         }
  90         return name;
  91 }
  92
  93 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
  94 {
  95         char *p2;
  96
  97         switch (sym->type) {
  98         case S_TRISTATE:
  99                 if (p[0] == 'm') {
 100                         sym->def[def].tri = mod;
 101                         sym->flags |= def_flags;
 102                         break;
 103                 }
 104         case S_BOOLEAN:
 105                 if (p[0] == 'y') {
 106                         sym->def[def].tri = yes;
 107                         sym->flags |= def_flags;
 108                         break;
 109                 }
 110                 if (p[0] == 'n') {
 111                         sym->def[def].tri = no;
 112                         sym->flags |= def_flags;
 113                         break;
 114                 }
 115                 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 116                 break;
 117         case S_OTHER:
 118                 if (*p != '"') {
 119                         for (p2 = p; *p2 && !isspace(*p2); p2++)
 120                                 ;
 121                         sym->type = S_STRING;
 122                         goto done;
 123                 }
 124         case S_STRING:
 125                 if (*p++ != '"')
 126                         break;
 127                 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
 128                         if (*p2 == '"') {
 129                                 *p2 = 0;
 130                                 break;
 131                         }
 132                         memmove(p2, p2 + 1, strlen(p2));
 133                 }
 134                 if (!p2) {
 135                         conf_warning("invalid string found");
 136                         return 1;
 137                 }
 138         case S_INT:
 139         case S_HEX:
 140         done:
 141                 if (sym_string_valid(sym, p)) {
 142                         sym->def[def].val = strdup(p);
 143                         sym->flags |= def_flags;
 144                 } else {
 145                         conf_warning("symbol value '%s' invalid for %s", p, sym->name);
 146                         return 1;
 147                 }
 148                 break;
 149         default:
 150                 ;
 151         }
 152         return 0;
 153 }
 154
 155 int conf_read_simple(const char *name, int def)
 156 {
 157         FILE *in = NULL;
 158         char line[1024];
 159         char *p, *p2;
 160         struct symbol *sym;
 161         int i, def_flags;
 162
 163         if (name) {
 164                 in = zconf_fopen(name);
 165         } else {
 166                 struct property *prop;
 167
 168                 name = conf_get_configname();
 169                 in = zconf_fopen(name);
 170                 if (in)
 171                         goto load;
 172                 sym_add_change_count(1);
 173                 if (!sym_defconfig_list)
 174                         return 1;
 175
 176                 for_all_defaults(sym_defconfig_list, prop) {
 177                         if (expr_calc_value(prop->visible.expr) == no ||
 178                             prop->expr->type != E_SYMBOL)
 179                                 continue;
 180                         name = conf_expand_value(prop->expr->left.sym->name);
 181                         in = zconf_fopen(name);
 182                         if (in) {
 183                                 printf(_("#\n"
 184                                          "# using defaults found in %s\n"
 185                                          "#\n"), name);
 186                                 goto load;
 187                         }
 188                 }
 189         }
 190         if (!in)
 191                 return 1;
 192
 193 load:
 194         conf_filename = name;
 195         conf_lineno = 0;
 196         conf_warnings = 0;
 197         conf_unsaved = 0;
 198
 199         def_flags = SYMBOL_DEF << def;
 200         for_all_symbols(i, sym) {
 201                 sym->flags |= SYMBOL_CHANGED;
 202                 sym->flags &= ~(def_flags|SYMBOL_VALID);
 203                 if (sym_is_choice(sym))
 204                         sym->flags |= def_flags;
 205                 switch (sym->type) {
 206                 case S_INT:
 207                 case S_HEX:
 208                 case S_STRING:
 209                         if (sym->def[def].val)
 210                                 free(sym->def[def].val);
 211                 default:
 212                         sym->def[def].val = NULL;
 213                         sym->def[def].tri = no;
 214                 }
 215         }
 216
 217         while (fgets(line, sizeof(line), in)) {
 218                 conf_lineno++;
 219                 sym = NULL;
 220                 switch (line[0]) {
 221                 case '#':
 222                         if (memcmp(line + 2, "CONFIG_", 7))
 223                                 continue;
 224                         p = strchr(line + 9, ' ');
 225                         if (!p)
 226                                 continue;
 227                         *p++ = 0;
 228                         if (strncmp(p, "is not set", 10))
 229                                 continue;
 230                         if (def == S_DEF_USER) {
 231                                 sym = sym_find(line + 9);
 232                                 if (!sym) {
 233                                         conf_warning("trying to assign nonexistent symbol %s", line + 9);
 234                                         break;
 235                                 }
 236                         } else {
 237                                 sym = sym_lookup(line + 9, 0);
 238                                 if (sym->type == S_UNKNOWN)
 239                                         sym->type = S_BOOLEAN;
 240                         }
 241                         if (sym->flags & def_flags) {
 242                                 conf_warning("override: reassigning to symbol %s", sym->name);
 243                         }
 244                         switch (sym->type) {
 245                         case S_BOOLEAN:
 246                         case S_TRISTATE:
 247                                 sym->def[def].tri = no;
 248                                 sym->flags |= def_flags;
 249                                 break;
 250                         default:
 251                                 ;
 252                         }
 253                         break;
 254                 case 'C':
 255                         if (memcmp(line, "CONFIG_", 7)) {
 256                                 conf_warning("unexpected data");
 257                                 continue;
 258                         }
 259                         p = strchr(line + 7, '=');
 260                         if (!p)
 261                                 continue;
 262                         *p++ = 0;
 263                         p2 = strchr(p, '\n');
 264                         if (p2) {
 265                                 *p2-- = 0;
 266                                 if (*p2 == '\r')
 267                                         *p2 = 0;
 268                         }
 269                         if (def == S_DEF_USER) {
 270                                 sym = sym_find(line + 7);
 271                                 if (!sym) {
 272                                         conf_warning("trying to assign nonexistent symbol %s", line + 7);
 273                                         break;
 274                                 }
 275                         } else {
 276                                 sym = sym_lookup(line + 7, 0);
 277                                 if (sym->type == S_UNKNOWN)
 278                                         sym->type = S_OTHER;
 279                         }
 280                         if (sym->flags & def_flags) {
 281                                 conf_warning("override: reassigning to symbol %s", sym->name);
 282                         }
 283                         if (conf_set_sym_val(sym, def, def_flags, p))
 284                                 continue;
 285                         break;
 286                 case '\r':
 287                 case '\n':
 288                         break;
 289                 default:
 290                         conf_warning("unexpected data");
 291                         continue;
 292                 }
 293                 if (sym && sym_is_choice_value(sym)) {
 294                         struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
 295                         switch (sym->def[def].tri) {
 296                         case no:
 297                                 break;
 298                         case mod:
 299                                 if (cs->def[def].tri == yes) {
 300                                         conf_warning("%s creates inconsistent choice state", sym->name);
 301                                         cs->flags &= ~def_flags;
 302                                 }
 303                                 break;
 304                         case yes:
 305                                 if (cs->def[def].tri != no)
 306                                         conf_warning("override: %s changes choice state", sym->name);
 307                                 cs->def[def].val = sym;
 308                                 break;
 309                         }
 310                         cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
 311                 }
 312         }
 313         fclose(in);
 314
 315         if (modules_sym)
 316                 sym_calc_value(modules_sym);
 317         return 0;
 318 }
 319
 320 int conf_read(const char *name)
 321 {
 322         struct symbol *sym, *choice_sym;
 323         struct property *prop;
 324         struct expr *e;
 325         int i, flags;
 326
 327         sym_set_change_count(0);
 328
 329         if (conf_read_simple(name, S_DEF_USER))
 330                 return 1;
 331
 332         for_all_symbols(i, sym) {
 333                 sym_calc_value(sym);
 334                 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
 335                         goto sym_ok;
 336                 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
 337                         /* check that calculated value agrees with saved value */
 338                         switch (sym->type) {
 339                         case S_BOOLEAN:
 340                         case S_TRISTATE:
 341                                 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
 342                                         break;
 343                                 if (!sym_is_choice(sym))
 344                                         goto sym_ok;
 345                         default:
 346                                 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
 347                                         goto sym_ok;
 348                                 break;
 349                         }
 350                 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
 351                         /* no previous value and not saved */
 352                         goto sym_ok;
 353                 conf_unsaved++;
 354                 /* maybe print value in verbose mode... */
 355         sym_ok:
 356                 if (!sym_is_choice(sym))
 357                         continue;
 358                 /* The choice symbol only has a set value (and thus is not new)
 359                  * if all its visible childs have values.
 360                  */
 361                 prop = sym_get_choice_prop(sym);
 362                 flags = sym->flags;
 363                 expr_list_for_each_sym(prop->expr, e, choice_sym)
 364                         if (choice_sym->visible != no)
 365                                 flags &= choice_sym->flags;
 366                 sym->flags &= flags | ~SYMBOL_DEF_USER;
 367         }
 368
 369         for_all_symbols(i, sym) {
 370                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
 371                         /* Reset values of generates values, so they'll appear
 372                          * as new, if they should become visible, but that
 373                          * doesn't quite work if the Kconfig and the saved
 374                          * configuration disagree.
 375                          */
 376                         if (sym->visible == no && !conf_unsaved)
 377                                 sym->flags &= ~SYMBOL_DEF_USER;
 378                         switch (sym->type) {
 379                         case S_STRING:
 380                         case S_INT:
 381                         case S_HEX:
 382                                 /* Reset a string value if it's out of range */
 383                                 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
 384                                         break;
 385                                 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
 386                                 conf_unsaved++;
 387                                 break;
 388                         default:
 389                                 break;
 390                         }
 391                 }
 392         }
 393
 394         sym_add_change_count(conf_warnings || conf_unsaved);
 395
 396         return 0;
 397 }
 398
 399 int conf_write(const char *name)
 400 {
 401         FILE *out;
 402         struct symbol *sym;
 403         struct menu *menu;
 404         const char *basename;
 405         char dirname[128], tmpname[128], newname[128];
 406         int type, l;
 407         const char *str;
 408         time_t now;
 409         int use_timestamp = 1;
 410         char *env;
 411
 412         dirname[0] = 0;
 413         if (name && name[0]) {
 414                 struct stat st;
 415                 char *slash;
 416
 417                 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
 418                         strcpy(dirname, name);
 419                         strcat(dirname, "/");
 420                         basename = conf_get_configname();
 421                 } else if ((slash = strrchr(name, '/'))) {
 422                         int size = slash - name + 1;
 423                         memcpy(dirname, name, size);
 424                         dirname[size] = 0;
 425                         if (slash[1])
 426                                 basename = slash + 1;
 427                         else
 428                                 basename = conf_get_configname();
 429                 } else
 430                         basename = name;
 431         } else
 432                 basename = conf_get_configname();
 433
 434         sprintf(newname, "%s%s", dirname, basename);
 435         env = getenv("KCONFIG_OVERWRITECONFIG");
 436         if (!env || !*env) {
 437                 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
 438                 out = fopen(tmpname, "w");
 439         } else {
 440                 *tmpname = 0;
 441                 out = fopen(newname, "w");
 442         }
 443         if (!out)
 444                 return 1;
 445
 446         sym = sym_lookup("KERNELVERSION", 0);
 447         sym_calc_value(sym);
 448         time(&now);
 449         env = getenv("KCONFIG_NOTIMESTAMP");
 450         if (env && *env)
 451                 use_timestamp = 0;
 452
 453         fprintf(out, _("#\n"
 454                        "# Automatically generated make config: don't edit\n"
 455                        "# coreboot version: %s\n"
 456                        "%s%s"
 457                        "#\n"),
 458                      getenv("KERNELVERSION")?getenv("KERNELVERSION"):"",
 459                      use_timestamp ? "# " : "",
 460                      use_timestamp ? ctime(&now) : "");
 461
 462         if (!conf_get_changed())
 463                 sym_clear_all_valid();
 464
 465         menu = rootmenu.list;
 466         while (menu) {
 467                 sym = menu->sym;
 468                 if (!sym) {
 469                         if (!menu_is_visible(menu))
 470                                 goto next;
 471                         str = menu_get_prompt(menu);
 472                         fprintf(out, "\n"
 473                                      "#\n"
 474                                      "# %s\n"
 475                                      "#\n", str);
 476                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
 477                         sym_calc_value(sym);
 478                         if (!(sym->flags & SYMBOL_WRITE))
 479                                 goto next;
 480                         sym->flags &= ~SYMBOL_WRITE;
 481                         type = sym->type;
 482                         if (type == S_TRISTATE) {
 483                                 sym_calc_value(modules_sym);
 484                                 if (modules_sym->curr.tri == no)
 485                                         type = S_BOOLEAN;
 486                         }
 487                         switch (type) {
 488                         case S_BOOLEAN:
 489                         case S_TRISTATE:
 490                                 switch (sym_get_tristate_value(sym)) {
 491                                 case no:
 492                                         fprintf(out, "# CONFIG_%s is not set\n", sym->name);
 493                                         break;
 494                                 case mod:
 495                                         fprintf(out, "CONFIG_%s=m\n", sym->name);
 496                                         break;
 497                                 case yes:
 498                                         fprintf(out, "CONFIG_%s=y\n", sym->name);
 499                                         break;
 500                                 }
 501                                 break;
 502                         case S_STRING:
 503                                 str = sym_get_string_value(sym);
 504                                 fprintf(out, "CONFIG_%s=\"", sym->name);
 505                                 while (1) {
 506                                         l = strcspn(str, "\"\\");
 507                                         if (l) {
 508                                                 fwrite(str, l, 1, out);
 509                                                 str += l;
 510                                         }
 511                                         if (!*str)
 512                                                 break;
 513                                         fprintf(out, "\\%c", *str++);
 514                                 }
 515                                 fputs("\"\n", out);
 516                                 break;
 517                         case S_HEX:
 518                                 str = sym_get_string_value(sym);
 519                                 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 520                                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 521                                         break;
 522                                 }
 523                         case S_INT:
 524                                 str = sym_get_string_value(sym);
 525                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 526                                 break;
 527                         }
 528                 }
 529
 530         next:
 531                 if (menu->list) {
 532                         menu = menu->list;
 533                         continue;
 534                 }
 535                 if (menu->next)
 536                         menu = menu->next;
 537                 else while ((menu = menu->parent)) {
 538                         if (menu->next) {
 539                                 menu = menu->next;
 540                                 break;
 541                         }
 542                 }
 543         }
 544         fclose(out);
 545
 546         if (*tmpname) {
 547                 strcat(dirname, basename);
 548                 strcat(dirname, ".old");
 549                 UNLINK_IF_NECESSARY(dirname);
 550                 rename(newname, dirname);
 551                 if (rename(tmpname, newname))
 552                         return 1;
 553         }
 554
 555         printf(_("#\n"
 556                  "# configuration written to %s\n"
 557                  "#\n"), newname);
 558
 559         sym_set_change_count(0);
 560
 561         return 0;
 562 }
 563
 564 int conf_split_config(void)
 565 {
 566         char *name, path[128];
 567         char *s, *d, c;
 568         struct symbol *sym;
 569         struct stat sb;
 570         int res, i, fd;
 571
 572         name = getenv("KCONFIG_AUTOCONFIG");
 573         if (!name)
 574                 name = "include/config/auto.conf";
 575         conf_read_simple(name, S_DEF_AUTO);
 576
 577         if (chdir("build"))
 578                 return 1;
 579
 580         res = 0;
 581         for_all_symbols(i, sym) {
 582                 sym_calc_value(sym);
 583                 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
 584                         continue;
 585                 if (sym->flags & SYMBOL_WRITE) {
 586                         if (sym->flags & SYMBOL_DEF_AUTO) {
 587                                 /*
 588                                  * symbol has old and new value,
 589                                  * so compare them...
 590                                  */
 591                                 switch (sym->type) {
 592                                 case S_BOOLEAN:
 593                                 case S_TRISTATE:
 594                                         if (sym_get_tristate_value(sym) ==
 595                                             sym->def[S_DEF_AUTO].tri)
 596                                                 continue;
 597                                         break;
 598                                 case S_STRING:
 599                                 case S_HEX:
 600                                 case S_INT:
 601                                         if (!strcmp(sym_get_string_value(sym),
 602                                                     sym->def[S_DEF_AUTO].val))
 603                                                 continue;
 604                                         break;
 605                                 default:
 606                                         break;
 607                                 }
 608                         } else {
 609                                 /*
 610                                  * If there is no old value, only 'no' (unset)
 611                                  * is allowed as new value.
 612                                  */
 613                                 switch (sym->type) {
 614                                 case S_BOOLEAN:
 615                                 case S_TRISTATE:
 616                                         if (sym_get_tristate_value(sym) == no)
 617                                                 continue;
 618                                         break;
 619                                 default:
 620                                         break;
 621                                 }
 622                         }
 623                 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
 624                         /* There is neither an old nor a new value. */
 625                         continue;
 626                 /* else
 627                  *      There is an old value, but no new value ('no' (unset)
 628                  *      isn't saved in auto.conf, so the old value is always
 629                  *      different from 'no').
 630                  */
 631
 632                 /* Replace all '_' and append ".h" */
 633                 s = sym->name;
 634                 d = path;
 635                 while ((c = *s++)) {
 636                         c = tolower(c);
 637                         *d++ = (c == '_') ? '/' : c;
 638                 }
 639                 strcpy(d, ".h");
 640
 641                 /* Assume directory path already exists. */
 642                 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 643                 if (fd == -1) {
 644                         if (errno != ENOENT) {
 645                                 res = 1;
 646                                 break;
 647                         }
 648                         /*
 649                          * Create directory components,
 650                          * unless they exist already.
 651                          */
 652                         d = path;
 653                         while ((d = strchr(d, '/'))) {
 654                                 *d = 0;
 655                                 if (stat(path, &sb) && mkdir(path, 0755)) {
 656                                         res = 1;
 657                                         goto out;
 658                                 }
 659                                 *d++ = '/';
 660                         }
 661                         /* Try it again. */
 662                         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 663                         if (fd == -1) {
 664                                 res = 1;
 665                                 break;
 666                         }
 667                 }
 668                 close(fd);
 669         }
 670 out:
 671         if (chdir("../.."))
 672                 return 1;
 673
 674         return res;
 675 }
 676
 677 /*
 678  * Return malloced string the contents of which are a concatenation of the
 679  * directory name of the first argument and the second argument.
 680  */
 681 static char* get_tmp_file_name(const char* base, const char *tmp_name)
 682 {
 683         char *file_name, *p;
 684         /* for sure a few bytes longer than needed */
 685         int file_name_size = strlen(base) + sizeof(file_name) + 10;
 686
 687         file_name = malloc(file_name_size);
 688         if (!file_name) {
 689                 fprintf(stderr, "%s:%d: failed to allocate %d bytes\n",
 690                         __FILE__, __LINE__, file_name_size);
 691                return 0;
 692         }
 693
 694         strcpy(file_name, base);
 695         p = strrchr(file_name, '/');
 696         if (p)
 697                 strcpy(p + 1, tmp_name);
 698         else
 699                 strcpy(file_name, tmp_name);
 700
 701         return file_name;
 702 }
 703
 704 int conf_write_autoconf(void)
 705 {
 706         struct symbol *sym;
 707         const char *str;
 708         char *name;
 709         FILE *out, *out_h;
 710         time_t now;
 711         int i, l;
 712         char *tmp_conf, *tmp_conf_h;
 713
 714         sym_clear_all_valid();
 715
 716         name = getenv("KCONFIG_AUTOHEADER");
 717         if (!name)
 718                 name = "include/linux/autoconf.h";
 719
 720         tmp_conf = get_tmp_file_name(name, ".tmpconfig");
 721         tmp_conf_h = get_tmp_file_name(name, ".tmpconfig.h");
 722         if (!tmp_conf || !tmp_conf_h)
 723                 return 1;
 724
 725         file_write_dep("build/auto.conf.cmd");
 726
 727 #if 0
 728         if (conf_split_config())
 729                 return 1;
 730 #endif
 731
 732         out = fopen(tmp_conf, "w");
 733         if (!out)
 734                 return 1;
 735
 736         out_h = fopen(tmp_conf_h, "w");
 737         if (!out_h) {
 738                 fclose(out);
 739                 return 1;
 740         }
 741
 742         sym = sym_lookup("KERNELVERSION", 0);
 743         sym_calc_value(sym);
 744         time(&now);
 745         fprintf(out, "#\n"
 746                      "# Automatically generated make config: don't edit\n"
 747                      "# coreboot version: %s\n"
 748                      "# %s"
 749                      "#\n",
 750                      getenv("KERNELVERSION")?getenv("KERNELVERSION"):"", ctime(&now));
 751         fprintf(out_h, "/*\n"
 752                        " * Automatically generated C config: don't edit\n"
 753                        " * coreboot version: %s\n"
 754                        " * %s"
 755                        " */\n"
 756                        "#define AUTOCONF_INCLUDED\n",
 757                        getenv("KERNELVERSION")?getenv("KERNELVERSION"):"", ctime(&now));
 758
 759         for_all_symbols(i, sym) {
 760                 sym_calc_value(sym);
 761                 if (!sym->name)
 762                         continue;
 763                 if (!(sym->flags & SYMBOL_WRITE)) {
 764                         if (sym->type == S_BOOLEAN || sym->type == S_HEX
 765                             || sym->type == S_INT)
 766                                 fprintf(out_h, "#define CONFIG_%s 0\n",
 767                                         sym->name);
 768                         continue;
 769                 }
 770                 switch (sym->type) {
 771                 case S_BOOLEAN:
 772                 case S_TRISTATE:
 773                         switch (sym_get_tristate_value(sym)) {
 774                         case no:
 775                                 fprintf(out, "CONFIG_%s=n\n", sym->name);
 776                                 fprintf(out_h, "#define CONFIG_%s 0\n", sym->name);
 777                                 break;
 778                         case mod:
 779                                 fprintf(out, "CONFIG_%s=m\n", sym->name);
 780                                 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
 781                                 break;
 782                         case yes:
 783                                 fprintf(out, "CONFIG_%s=y\n", sym->name);
 784                                 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
 785                                 break;
 786                         }
 787                         break;
 788                 case S_STRING:
 789                         str = sym_get_string_value(sym);
 790                         fprintf(out, "CONFIG_%s=\"", sym->name);
 791                         fprintf(out_h, "#define CONFIG_%s \"", sym->name);
 792                         while (1) {
 793                                 l = strcspn(str, "\"\\");
 794                                 if (l) {
 795                                         fwrite(str, l, 1, out);
 796                                         fwrite(str, l, 1, out_h);
 797                                         str += l;
 798                                 }
 799                                 if (!*str)
 800                                         break;
 801                                 fprintf(out, "\\%c", *str);
 802                                 fprintf(out_h, "\\%c", *str);
 803                                 str++;
 804                         }
 805                         fputs("\"\n", out);
 806                         fputs("\"\n", out_h);
 807                         break;
 808                 case S_HEX:
 809                         str = sym_get_string_value(sym);
 810                         if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
 811                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 812                                 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
 813                                 break;
 814                         }
 815                 case S_INT:
 816                         str = sym_get_string_value(sym);
 817                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
 818                         fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
 819                         break;
 820                 default:
 821                         break;
 822                 }
 823         }
 824         fclose(out);
 825         fclose(out_h);
 826
 827         UNLINK_IF_NECESSARY(name);
 828         if (rename(tmp_conf_h, name))
 829                 return 1;
 830         name = getenv("KCONFIG_AUTOCONFIG");
 831         if (!name)
 832                 name = "include/config/auto.conf";
 833         /*
 834          * This must be the last step, kbuild has a dependency on auto.conf
 835          * and this marks the successful completion of the previous steps.
 836          */
 837         UNLINK_IF_NECESSARY(name);
 838         if (rename(tmp_conf, name))
 839                 return 1;
 840
 841         free(tmp_conf_h);
 842         free(tmp_conf);
 843         return 0;
 844 }
 845
 846 static int sym_change_count;
 847 static void (*conf_changed_callback)(void);
 848
 849 void sym_set_change_count(int count)
 850 {
 851         int _sym_change_count = sym_change_count;
 852         sym_change_count = count;
 853         if (conf_changed_callback &&
 854             (bool)_sym_change_count != (bool)count)
 855                 conf_changed_callback();
 856 }
 857
 858 void sym_add_change_count(int count)
 859 {
 860         sym_set_change_count(count + sym_change_count);
 861 }
 862
 863 bool conf_get_changed(void)
 864 {
 865         return sym_change_count;
 866 }
 867
 868 void conf_set_changed_callback(void (*fn)(void))
 869 {
 870         conf_changed_callback = fn;
 871 }