Patrick Georgi | 36ade67 | 2011-01-28 07:56:39 +0000 | [diff] [blame] | 1 | /*****************************************************************************\ |
| 2 | * lbtable.c |
| 3 | ***************************************************************************** |
Vikram Narayanan | a8111cf | 2012-04-14 15:25:13 +0530 | [diff] [blame] | 4 | * Copyright (C) 2012, Vikram Narayanan |
| 5 | * Unified build_opt_tbl and nvramtool |
| 6 | * build_opt_tbl.c |
| 7 | * Copyright (C) 2003 Eric Biederman (ebiederm@xmission.com) |
| 8 | * Copyright (C) 2007-2010 coresystems GmbH |
| 9 | * |
Patrick Georgi | 36ade67 | 2011-01-28 07:56:39 +0000 | [diff] [blame] | 10 | * Copyright (C) 2002-2005 The Regents of the University of California. |
| 11 | * Produced at the Lawrence Livermore National Laboratory. |
| 12 | * Written by Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com> |
| 13 | * and Stefan Reinauer <stepan@openbios.org>. |
| 14 | * UCRL-CODE-2003-012 |
| 15 | * All rights reserved. |
| 16 | * |
| 17 | * This file is part of nvramtool, a utility for reading/writing coreboot |
| 18 | * parameters and displaying information from the coreboot table. |
| 19 | * For details, see http://coreboot.org/nvramtool. |
| 20 | * |
| 21 | * Please also read the file DISCLAIMER which is included in this software |
| 22 | * distribution. |
| 23 | * |
| 24 | * This program is free software; you can redistribute it and/or modify it |
| 25 | * under the terms of the GNU General Public License (as published by the |
| 26 | * Free Software Foundation) version 2, dated June 1991. |
| 27 | * |
| 28 | * This program is distributed in the hope that it will be useful, but |
| 29 | * WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF |
| 30 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and |
| 31 | * conditions of the GNU General Public License for more details. |
| 32 | * |
| 33 | * You should have received a copy of the GNU General Public License along |
| 34 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 35 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 36 | \*****************************************************************************/ |
| 37 | |
Patrick Georgi | 36ade67 | 2011-01-28 07:56:39 +0000 | [diff] [blame] | 38 | #include <string.h> |
Zheng Bao | 5451672 | 2012-10-22 16:41:42 +0800 | [diff] [blame^] | 39 | #ifndef __MINGW32__ |
Patrick Georgi | 36ade67 | 2011-01-28 07:56:39 +0000 | [diff] [blame] | 40 | #include <sys/mman.h> |
Zheng Bao | 5451672 | 2012-10-22 16:41:42 +0800 | [diff] [blame^] | 41 | #endif |
Patrick Georgi | 36ade67 | 2011-01-28 07:56:39 +0000 | [diff] [blame] | 42 | #include "common.h" |
| 43 | #include "coreboot_tables.h" |
| 44 | #include "ip_checksum.h" |
| 45 | #include "lbtable.h" |
| 46 | #include "layout.h" |
| 47 | #include "cmos_lowlevel.h" |
| 48 | #include "hexdump.h" |
| 49 | #include "cbfs.h" |
Vikram Narayanan | a8111cf | 2012-04-14 15:25:13 +0530 | [diff] [blame] | 50 | #include "layout-text.h" |
Patrick Georgi | 36ade67 | 2011-01-28 07:56:39 +0000 | [diff] [blame] | 51 | |
| 52 | static void process_cmos_table(void); |
| 53 | static void get_cmos_checksum_info(void); |
| 54 | static void try_convert_checksum_layout(cmos_checksum_layout_t * layout); |
| 55 | static void try_add_cmos_table_enum(cmos_enum_t * cmos_enum); |
| 56 | static void try_add_cmos_table_entry(cmos_entry_t * cmos_entry); |
| 57 | static const struct cmos_entries *first_cmos_table_entry(void); |
| 58 | static const struct cmos_entries *next_cmos_table_entry(const struct |
| 59 | cmos_entries *last); |
| 60 | static const struct cmos_enums *first_cmos_table_enum(void); |
| 61 | static const struct cmos_enums *next_cmos_table_enum |
| 62 | (const struct cmos_enums *last); |
| 63 | static const struct lb_record *first_cmos_rec(uint32_t tag); |
| 64 | static const struct lb_record *next_cmos_rec(const struct lb_record *last, |
| 65 | uint32_t tag); |
| 66 | |
| 67 | /* The CMOS option table is located within the coreboot table. It tells us |
| 68 | * where the CMOS parameters are located in the nonvolatile RAM. |
| 69 | */ |
| 70 | static const struct cmos_option_table *cmos_table = NULL; |
| 71 | |
Vikram Narayanan | a8111cf | 2012-04-14 15:25:13 +0530 | [diff] [blame] | 72 | #define ROUNDUP4(x) (x += (4 - (x % 4))) |
| 73 | |
Patrick Georgi | 36ade67 | 2011-01-28 07:56:39 +0000 | [diff] [blame] | 74 | void process_layout(void) |
| 75 | { |
| 76 | if ((cmos_table) == NULL) { |
| 77 | fprintf(stderr, |
| 78 | "%s: CMOS option table not found in coreboot table. " |
| 79 | "Apparently, the coreboot installed on this system was " |
| 80 | "built without specifying CONFIG_HAVE_OPTION_TABLE.\n", |
| 81 | prog_name); |
| 82 | exit(1); |
| 83 | } |
| 84 | |
| 85 | process_cmos_table(); |
| 86 | get_cmos_checksum_info(); |
| 87 | } |
| 88 | |
| 89 | void get_layout_from_cbfs_file(void) |
| 90 | { |
| 91 | uint32_t len; |
| 92 | cmos_table = cbfs_find_file("cmos_layout.bin", CBFS_COMPONENT_CMOS_LAYOUT, &len); |
| 93 | process_layout(); |
| 94 | } |
| 95 | |
Vikram Narayanan | a8111cf | 2012-04-14 15:25:13 +0530 | [diff] [blame] | 96 | int write_cmos_layout_bin(FILE *f) |
| 97 | { |
| 98 | const cmos_entry_t *cmos_entry; |
| 99 | const cmos_enum_t *cmos_enum; |
| 100 | cmos_checksum_layout_t layout; |
| 101 | struct cmos_option_table table; |
| 102 | struct cmos_entries entry; |
| 103 | struct cmos_enums cenum; |
| 104 | struct cmos_checksum csum; |
| 105 | size_t sum = 0; |
| 106 | int len; |
| 107 | |
| 108 | for (cmos_entry = first_cmos_entry(); cmos_entry != NULL; |
| 109 | cmos_entry = next_cmos_entry(cmos_entry)) { |
| 110 | |
| 111 | if (cmos_entry == first_cmos_entry()) { |
| 112 | sum += sizeof(table); |
| 113 | table.header_length = sizeof(table); |
| 114 | table.tag = LB_TAG_CMOS_OPTION_TABLE; |
| 115 | |
| 116 | if (fwrite((char *)&table, sizeof(table), 1, f) != 1) { |
| 117 | perror("Error writing image file"); |
| 118 | goto err; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | memset(&entry, 0, sizeof(entry)); |
| 123 | entry.tag = LB_TAG_OPTION; |
| 124 | entry.config = cmos_entry->config; |
| 125 | entry.config_id = (uint32_t)cmos_entry->config_id; |
| 126 | entry.bit = cmos_entry->bit; |
| 127 | entry.length = cmos_entry->length; |
| 128 | |
| 129 | if (!is_ident((char *)cmos_entry->name)) { |
| 130 | fprintf(stderr, |
| 131 | "Error - Name %s is an invalid identifier\n", |
| 132 | cmos_entry->name); |
| 133 | goto err; |
| 134 | } |
| 135 | |
| 136 | memcpy(entry.name, cmos_entry->name, strlen(cmos_entry->name)); |
| 137 | entry.name[strlen(cmos_entry->name)] = '\0'; |
| 138 | len = strlen(cmos_entry->name) + 1; |
| 139 | |
| 140 | if (len % 4) |
| 141 | ROUNDUP4(len); |
| 142 | |
| 143 | entry.size = sizeof(entry) - CMOS_MAX_NAME_LENGTH + len; |
| 144 | sum += entry.size; |
| 145 | if (fwrite((char *)&entry, entry.size, 1, f) != 1) { |
| 146 | perror("Error writing image file"); |
| 147 | goto err; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | for (cmos_enum = first_cmos_enum(); |
| 152 | cmos_enum != NULL; cmos_enum = next_cmos_enum(cmos_enum)) { |
| 153 | memset(&cenum, 0, sizeof(cenum)); |
| 154 | cenum.tag = LB_TAG_OPTION_ENUM; |
| 155 | memcpy(cenum.text, cmos_enum->text, strlen(cmos_enum->text)); |
| 156 | cenum.text[strlen(cmos_enum->text)] = '\0'; |
| 157 | len = strlen((char *)cenum.text) + 1; |
| 158 | |
| 159 | if (len % 4) |
| 160 | ROUNDUP4(len); |
| 161 | |
| 162 | cenum.config_id = cmos_enum->config_id; |
| 163 | cenum.value = cmos_enum->value; |
| 164 | cenum.size = sizeof(cenum) - CMOS_MAX_TEXT_LENGTH + len; |
| 165 | sum += cenum.size; |
| 166 | if (fwrite((char *)&cenum, cenum.size, 1, f) != 1) { |
| 167 | perror("Error writing image file"); |
| 168 | goto err; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | layout.summed_area_start = cmos_checksum_start; |
| 173 | layout.summed_area_end = cmos_checksum_end; |
| 174 | layout.checksum_at = cmos_checksum_index; |
| 175 | checksum_layout_to_bits(&layout); |
| 176 | |
| 177 | csum.tag = LB_TAG_OPTION_CHECKSUM; |
| 178 | csum.size = sizeof(csum); |
| 179 | csum.range_start = layout.summed_area_start; |
| 180 | csum.range_end = layout.summed_area_end; |
| 181 | csum.location = layout.checksum_at; |
| 182 | csum.type = CHECKSUM_PCBIOS; |
| 183 | sum += csum.size; |
| 184 | |
| 185 | if (fwrite((char *)&csum, csum.size, 1, f) != 1) { |
| 186 | perror("Error writing image file"); |
| 187 | goto err; |
| 188 | } |
| 189 | |
| 190 | if (fseek(f, sizeof(table.tag), SEEK_SET) != 0) { |
| 191 | perror("Error while seeking"); |
| 192 | goto err; |
| 193 | } |
| 194 | |
| 195 | if (fwrite((char *)&sum, sizeof(table.tag), 1, f) != 1) { |
| 196 | perror("Error writing image file"); |
| 197 | goto err; |
| 198 | } |
| 199 | return sum; |
| 200 | |
| 201 | err: |
| 202 | fclose(f); |
| 203 | exit(1); |
| 204 | } |
| 205 | |
| 206 | void write_cmos_output_bin(const char *binary_filename) |
| 207 | { |
| 208 | FILE *fp; |
| 209 | |
| 210 | if ((fp = fopen(binary_filename, "wb")) == NULL) { |
| 211 | fprintf(stderr, |
| 212 | "%s: Can not open file %s for writing: " |
| 213 | "%s\n", prog_name, binary_filename, strerror(errno)); |
| 214 | exit(1); |
| 215 | } |
| 216 | write_cmos_layout_bin(fp); |
| 217 | fclose(fp); |
| 218 | } |
| 219 | |
Patrick Georgi | 36ade67 | 2011-01-28 07:56:39 +0000 | [diff] [blame] | 220 | /**************************************************************************** |
Mathias Krause | 155c379 | 2011-03-10 07:52:02 +0000 | [diff] [blame] | 221 | * get_layout_from_cmos_table |
| 222 | * |
| 223 | * Find the CMOS table which is stored within the coreboot table and set the |
| 224 | * global variable cmos_table to point to it. |
| 225 | ****************************************************************************/ |
| 226 | void get_layout_from_cmos_table(void) |
| 227 | { |
| 228 | get_lbtable(); |
| 229 | cmos_table = (const struct cmos_option_table *) |
| 230 | find_lbrec(LB_TAG_CMOS_OPTION_TABLE); |
| 231 | process_layout(); |
| 232 | } |
| 233 | |
| 234 | /**************************************************************************** |
Patrick Georgi | 36ade67 | 2011-01-28 07:56:39 +0000 | [diff] [blame] | 235 | * process_cmos_table |
| 236 | * |
| 237 | * Extract layout information from the CMOS option table and store it in our |
| 238 | * internal repository. |
| 239 | ****************************************************************************/ |
| 240 | static void process_cmos_table(void) |
| 241 | { |
| 242 | const struct cmos_enums *p; |
| 243 | const struct cmos_entries *q; |
| 244 | cmos_enum_t cmos_enum; |
| 245 | cmos_entry_t cmos_entry; |
| 246 | |
| 247 | /* First add the enums. */ |
| 248 | for (p = first_cmos_table_enum(); p != NULL; |
| 249 | p = next_cmos_table_enum(p)) { |
| 250 | cmos_enum.config_id = p->config_id; |
| 251 | cmos_enum.value = p->value; |
| 252 | strncpy(cmos_enum.text, (char *)p->text, CMOS_MAX_TEXT_LENGTH); |
| 253 | cmos_enum.text[CMOS_MAX_TEXT_LENGTH] = '\0'; |
| 254 | try_add_cmos_table_enum(&cmos_enum); |
| 255 | } |
| 256 | |
| 257 | /* Now add the entries. We must add the entries after the enums because |
| 258 | * the entries are sanity checked against the enums as they are added. |
| 259 | */ |
| 260 | for (q = first_cmos_table_entry(); q != NULL; |
| 261 | q = next_cmos_table_entry(q)) { |
| 262 | cmos_entry.bit = q->bit; |
| 263 | cmos_entry.length = q->length; |
| 264 | |
| 265 | switch (q->config) { |
| 266 | case 'e': |
| 267 | cmos_entry.config = CMOS_ENTRY_ENUM; |
| 268 | break; |
| 269 | |
| 270 | case 'h': |
| 271 | cmos_entry.config = CMOS_ENTRY_HEX; |
| 272 | break; |
| 273 | |
| 274 | case 'r': |
| 275 | cmos_entry.config = CMOS_ENTRY_RESERVED; |
| 276 | break; |
| 277 | |
| 278 | case 's': |
| 279 | cmos_entry.config = CMOS_ENTRY_STRING; |
| 280 | break; |
| 281 | |
| 282 | default: |
| 283 | fprintf(stderr, |
| 284 | "%s: Entry in CMOS option table has unknown config " |
| 285 | "value.\n", prog_name); |
| 286 | exit(1); |
| 287 | } |
| 288 | |
| 289 | cmos_entry.config_id = q->config_id; |
| 290 | strncpy(cmos_entry.name, (char *)q->name, CMOS_MAX_NAME_LENGTH); |
| 291 | cmos_entry.name[CMOS_MAX_NAME_LENGTH] = '\0'; |
| 292 | try_add_cmos_table_entry(&cmos_entry); |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | /**************************************************************************** |
| 297 | * get_cmos_checksum_info |
| 298 | * |
| 299 | * Get layout information for CMOS checksum. |
| 300 | ****************************************************************************/ |
| 301 | static void get_cmos_checksum_info(void) |
| 302 | { |
| 303 | const cmos_entry_t *e; |
| 304 | struct cmos_checksum *checksum; |
| 305 | cmos_checksum_layout_t layout; |
| 306 | unsigned index, index2; |
| 307 | |
| 308 | checksum = (struct cmos_checksum *)next_cmos_rec((const struct lb_record *)first_cmos_table_enum(), LB_TAG_OPTION_CHECKSUM); |
| 309 | |
| 310 | if (checksum != NULL) { /* We are lucky. The coreboot table hints us to the checksum. |
| 311 | * We might have to check the type field here though. |
| 312 | */ |
| 313 | layout.summed_area_start = checksum->range_start; |
| 314 | layout.summed_area_end = checksum->range_end; |
| 315 | layout.checksum_at = checksum->location; |
| 316 | try_convert_checksum_layout(&layout); |
| 317 | cmos_checksum_start = layout.summed_area_start; |
| 318 | cmos_checksum_end = layout.summed_area_end; |
| 319 | cmos_checksum_index = layout.checksum_at; |
| 320 | return; |
| 321 | } |
| 322 | |
| 323 | if ((e = find_cmos_entry(checksum_param_name)) == NULL) |
| 324 | return; |
| 325 | |
| 326 | /* If we get here, we are unlucky. The CMOS option table contains the |
| 327 | * location of the CMOS checksum. However, there is no information |
| 328 | * regarding which bytes of the CMOS area the checksum is computed over. |
| 329 | * Thus we have to hope our presets will be fine. |
| 330 | */ |
| 331 | |
| 332 | if (e->bit % 8) { |
| 333 | fprintf(stderr, |
| 334 | "%s: Error: CMOS checksum is not byte-aligned.\n", |
| 335 | prog_name); |
| 336 | exit(1); |
| 337 | } |
| 338 | |
| 339 | index = e->bit / 8; |
| 340 | index2 = index + 1; /* The CMOS checksum occupies 16 bits. */ |
| 341 | |
| 342 | if (verify_cmos_byte_index(index) || verify_cmos_byte_index(index2)) { |
| 343 | fprintf(stderr, |
| 344 | "%s: Error: CMOS checksum location out of range.\n", |
| 345 | prog_name); |
| 346 | exit(1); |
| 347 | } |
| 348 | |
| 349 | if (((index >= cmos_checksum_start) && (index <= cmos_checksum_end)) || |
| 350 | (((index2) >= cmos_checksum_start) |
| 351 | && ((index2) <= cmos_checksum_end))) { |
| 352 | fprintf(stderr, |
| 353 | "%s: Error: CMOS checksum overlaps checksummed area.\n", |
| 354 | prog_name); |
| 355 | exit(1); |
| 356 | } |
| 357 | |
| 358 | cmos_checksum_index = index; |
| 359 | } |
| 360 | |
| 361 | /**************************************************************************** |
| 362 | * try_convert_checksum_layout |
| 363 | * |
| 364 | * Perform sanity checking on CMOS checksum layout information and attempt to |
| 365 | * convert information from bit positions to byte positions. Return OK on |
| 366 | * success or an error code on failure. |
| 367 | ****************************************************************************/ |
| 368 | static void try_convert_checksum_layout(cmos_checksum_layout_t * layout) |
| 369 | { |
| 370 | switch (checksum_layout_to_bytes(layout)) { |
| 371 | case OK: |
| 372 | return; |
| 373 | |
| 374 | case LAYOUT_SUMMED_AREA_START_NOT_ALIGNED: |
| 375 | fprintf(stderr, |
| 376 | "%s: CMOS checksummed area start is not byte-aligned.\n", |
| 377 | prog_name); |
| 378 | break; |
| 379 | |
| 380 | case LAYOUT_SUMMED_AREA_END_NOT_ALIGNED: |
| 381 | fprintf(stderr, |
| 382 | "%s: CMOS checksummed area end is not byte-aligned.\n", |
| 383 | prog_name); |
| 384 | break; |
| 385 | |
| 386 | case LAYOUT_CHECKSUM_LOCATION_NOT_ALIGNED: |
| 387 | fprintf(stderr, |
| 388 | "%s: CMOS checksum location is not byte-aligned.\n", |
| 389 | prog_name); |
| 390 | break; |
| 391 | |
| 392 | case LAYOUT_INVALID_SUMMED_AREA: |
| 393 | fprintf(stderr, |
| 394 | "%s: CMOS checksummed area end must be greater than " |
| 395 | "CMOS checksummed area start.\n", prog_name); |
| 396 | break; |
| 397 | |
| 398 | case LAYOUT_CHECKSUM_OVERLAPS_SUMMED_AREA: |
| 399 | fprintf(stderr, |
| 400 | "%s: CMOS checksum overlaps checksummed area.\n", |
| 401 | prog_name); |
| 402 | break; |
| 403 | |
| 404 | case LAYOUT_SUMMED_AREA_OUT_OF_RANGE: |
| 405 | fprintf(stderr, |
| 406 | "%s: CMOS checksummed area out of range.\n", prog_name); |
| 407 | break; |
| 408 | |
| 409 | case LAYOUT_CHECKSUM_LOCATION_OUT_OF_RANGE: |
| 410 | fprintf(stderr, |
| 411 | "%s: CMOS checksum location out of range.\n", |
| 412 | prog_name); |
| 413 | break; |
| 414 | |
| 415 | default: |
| 416 | BUG(); |
| 417 | } |
| 418 | |
| 419 | exit(1); |
| 420 | } |
| 421 | |
| 422 | /**************************************************************************** |
| 423 | * try_add_cmos_table_enum |
| 424 | * |
| 425 | * Attempt to add a CMOS enum to our internal repository. Exit with an error |
| 426 | * message on failure. |
| 427 | ****************************************************************************/ |
| 428 | static void try_add_cmos_table_enum(cmos_enum_t * cmos_enum) |
| 429 | { |
| 430 | switch (add_cmos_enum(cmos_enum)) { |
| 431 | case OK: |
| 432 | return; |
| 433 | |
| 434 | case LAYOUT_DUPLICATE_ENUM: |
| 435 | fprintf(stderr, "%s: Duplicate enum %s found in CMOS option " |
| 436 | "table.\n", prog_name, cmos_enum->text); |
| 437 | break; |
| 438 | |
| 439 | default: |
| 440 | BUG(); |
| 441 | } |
| 442 | |
| 443 | exit(1); |
| 444 | } |
| 445 | |
| 446 | /**************************************************************************** |
| 447 | * try_add_cmos_table_entry |
| 448 | * |
| 449 | * Attempt to add a CMOS entry to our internal repository. Exit with an |
| 450 | * error message on failure. |
| 451 | ****************************************************************************/ |
| 452 | static void try_add_cmos_table_entry(cmos_entry_t * cmos_entry) |
| 453 | { |
| 454 | const cmos_entry_t *conflict; |
| 455 | |
| 456 | switch (add_cmos_entry(cmos_entry, &conflict)) { |
| 457 | case OK: |
| 458 | return; |
| 459 | |
| 460 | case CMOS_AREA_OUT_OF_RANGE: |
| 461 | fprintf(stderr, |
| 462 | "%s: Bad CMOS option layout in CMOS option table entry " |
| 463 | "%s.\n", prog_name, cmos_entry->name); |
| 464 | break; |
| 465 | |
| 466 | case CMOS_AREA_TOO_WIDE: |
| 467 | fprintf(stderr, |
| 468 | "%s: Area too wide for CMOS option table entry %s.\n", |
| 469 | prog_name, cmos_entry->name); |
| 470 | break; |
| 471 | |
| 472 | case LAYOUT_ENTRY_OVERLAP: |
| 473 | fprintf(stderr, |
| 474 | "%s: CMOS option table entries %s and %s have overlapping " |
| 475 | "layouts.\n", prog_name, cmos_entry->name, |
| 476 | conflict->name); |
| 477 | break; |
| 478 | |
| 479 | case LAYOUT_ENTRY_BAD_LENGTH: |
| 480 | /* Silently ignore entries with zero length. Although this should |
| 481 | * never happen in practice, we should handle the case in a |
| 482 | * reasonable manner just to be safe. |
| 483 | */ |
| 484 | return; |
| 485 | |
| 486 | default: |
| 487 | BUG(); |
| 488 | } |
| 489 | |
| 490 | exit(1); |
| 491 | } |
| 492 | |
| 493 | /**************************************************************************** |
| 494 | * first_cmos_table_entry |
| 495 | * |
| 496 | * Return a pointer to the first entry in the CMOS table that represents a |
| 497 | * CMOS parameter. Return NULL if CMOS table is empty. |
| 498 | ****************************************************************************/ |
| 499 | static const struct cmos_entries *first_cmos_table_entry(void) |
| 500 | { |
| 501 | return (const struct cmos_entries *)first_cmos_rec(LB_TAG_OPTION); |
| 502 | } |
| 503 | |
| 504 | /**************************************************************************** |
| 505 | * next_cmos_table_entry |
| 506 | * |
| 507 | * Return a pointer to the next entry after 'last' in the CMOS table that |
| 508 | * represents a CMOS parameter. Return NULL if there are no more parameters. |
| 509 | ****************************************************************************/ |
| 510 | static const struct cmos_entries *next_cmos_table_entry(const struct |
| 511 | cmos_entries *last) |
| 512 | { |
| 513 | return (const struct cmos_entries *) |
| 514 | next_cmos_rec((const struct lb_record *)last, LB_TAG_OPTION); |
| 515 | } |
| 516 | |
| 517 | /**************************************************************************** |
| 518 | * first_cmos_table_enum |
| 519 | * |
| 520 | * Return a pointer to the first entry in the CMOS table that represents a |
| 521 | * possible CMOS parameter value. Return NULL if the table does not contain |
| 522 | * any such entries. |
| 523 | ****************************************************************************/ |
| 524 | static const struct cmos_enums *first_cmos_table_enum(void) |
| 525 | { |
| 526 | return (const struct cmos_enums *)first_cmos_rec(LB_TAG_OPTION_ENUM); |
| 527 | } |
| 528 | |
| 529 | /**************************************************************************** |
| 530 | * next_cmos_table_enum |
| 531 | * |
| 532 | * Return a pointer to the next entry after 'last' in the CMOS table that |
| 533 | * represents a possible CMOS parameter value. Return NULL if there are no |
| 534 | * more parameter values. |
| 535 | ****************************************************************************/ |
| 536 | static const struct cmos_enums *next_cmos_table_enum |
| 537 | (const struct cmos_enums *last) { |
| 538 | return (const struct cmos_enums *) |
| 539 | next_cmos_rec((const struct lb_record *)last, LB_TAG_OPTION_ENUM); |
| 540 | } |
| 541 | |
| 542 | /**************************************************************************** |
| 543 | * first_cmos_rec |
| 544 | * |
| 545 | * Return a pointer to the first entry in the CMOS table whose type matches |
| 546 | * 'tag'. Return NULL if CMOS table contains no such entry. |
| 547 | * |
| 548 | * Possible values for 'tag' are as follows: |
| 549 | * |
| 550 | * LB_TAG_OPTION: The entry represents a CMOS parameter. |
| 551 | * LB_TAG_OPTION_ENUM: The entry represents a possible value for a CMOS |
| 552 | * parameter of type 'enum'. |
| 553 | * |
| 554 | * The CMOS table tells us where in the nonvolatile RAM to look for CMOS |
| 555 | * parameter values and specifies their types as 'enum', 'hex', or |
| 556 | * 'reserved'. |
| 557 | ****************************************************************************/ |
| 558 | static const struct lb_record *first_cmos_rec(uint32_t tag) |
| 559 | { |
| 560 | const char *p; |
| 561 | uint32_t bytes_processed, bytes_for_entries; |
| 562 | const struct lb_record *lbrec; |
| 563 | |
| 564 | p = ((const char *)cmos_table) + cmos_table->header_length; |
| 565 | bytes_for_entries = cmos_table->size - cmos_table->header_length; |
| 566 | |
| 567 | for (bytes_processed = 0; |
| 568 | bytes_processed < bytes_for_entries; |
| 569 | bytes_processed += lbrec->size) { |
| 570 | lbrec = (const struct lb_record *)&p[bytes_processed]; |
| 571 | |
| 572 | if (lbrec->tag == tag) |
| 573 | return lbrec; |
| 574 | } |
| 575 | |
| 576 | return NULL; |
| 577 | } |
| 578 | |
| 579 | /**************************************************************************** |
| 580 | * next_cmos_rec |
| 581 | * |
| 582 | * Return a pointer to the next entry after 'last' in the CMOS table whose |
| 583 | * type matches 'tag'. Return NULL if the table contains no more entries of |
| 584 | * this type. |
| 585 | ****************************************************************************/ |
| 586 | static const struct lb_record *next_cmos_rec(const struct lb_record *last, |
| 587 | uint32_t tag) |
| 588 | { |
| 589 | const char *p; |
| 590 | uint32_t bytes_processed, bytes_for_entries, last_offset; |
| 591 | const struct lb_record *lbrec; |
| 592 | |
| 593 | p = ((const char *)cmos_table) + cmos_table->header_length; |
| 594 | bytes_for_entries = cmos_table->size - cmos_table->header_length; |
| 595 | last_offset = ((const char *)last) - p; |
| 596 | |
| 597 | for (bytes_processed = last_offset + last->size; |
| 598 | bytes_processed < bytes_for_entries; |
| 599 | bytes_processed += lbrec->size) { |
| 600 | lbrec = (const struct lb_record *)&p[bytes_processed]; |
| 601 | |
| 602 | if (lbrec->tag == tag) |
| 603 | return lbrec; |
| 604 | } |
| 605 | |
| 606 | return NULL; |
| 607 | } |
| 608 | |