git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/acpica/tbutils.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbutils   - table utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "actables.h"
  47
  48 #define _COMPONENT          ACPI_TABLES
  49 ACPI_MODULE_NAME("tbutils")
  50
  51 /* Local prototypes */
  52 static acpi_physical_address
  53 acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_tb_check_xsdt
  58  *
  59  * PARAMETERS:  address                    - Pointer to the XSDT
  60  *
  61  * RETURN:      status
  62  *              AE_OK - XSDT is okay
  63  *              AE_NO_MEMORY - can't map XSDT
  64  *              AE_INVALID_TABLE_LENGTH - invalid table length
  65  *              AE_NULL_ENTRY - XSDT has NULL entry
  66  *
  67  * DESCRIPTION: validate XSDT
  68 ******************************************************************************/
  69
  70 static acpi_status
  71 acpi_tb_check_xsdt(acpi_physical_address address)
  72 {
  73         struct acpi_table_header *table;
  74         u32 length;
  75         u64 xsdt_entry_address;
  76         u8 *table_entry;
  77         u32 table_count;
  78         int i;
  79
  80         table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
  81         if (!table)
  82                 return AE_NO_MEMORY;
  83
  84         length = table->length;
  85         acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
  86         if (length < sizeof(struct acpi_table_header))
  87                 return AE_INVALID_TABLE_LENGTH;
  88
  89         table = acpi_os_map_memory(address, length);
  90         if (!table)
  91                 return AE_NO_MEMORY;
  92
  93         /* Calculate the number of tables described in XSDT */
  94         table_count =
  95                 (u32) ((table->length -
  96                 sizeof(struct acpi_table_header)) / sizeof(u64));
  97         table_entry =
  98                 ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
  99         for (i = 0; i < table_count; i++) {
 100                 ACPI_MOVE_64_TO_64(&xsdt_entry_address, table_entry);
 101                 if (!xsdt_entry_address) {
 102                         /* XSDT has NULL entry */
 103                         break;
 104                 }
 105                 table_entry += sizeof(u64);
 106         }
 107         acpi_os_unmap_memory(table, length);
 108
 109         if (i < table_count)
 110                 return AE_NULL_ENTRY;
 111         else
 112                 return AE_OK;
 113 }
 114
 115 /*******************************************************************************
 116  *
 117  * FUNCTION:    acpi_tb_initialize_facs
 118  *
 119  * PARAMETERS:  None
 120  *
 121  * RETURN:      Status
 122  *
 123  * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
 124  *              for accessing the Global Lock and Firmware Waking Vector
 125  *
 126  ******************************************************************************/
 127
 128 acpi_status acpi_tb_initialize_facs(void)
 129 {
 130         acpi_status status;
 131
 132         status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
 133                                          ACPI_CAST_INDIRECT_PTR(struct
 134                                                                 acpi_table_header,
 135                                                                 &acpi_gbl_FACS));
 136         return status;
 137 }
 138
 139 /*******************************************************************************
 140  *
 141  * FUNCTION:    acpi_tb_tables_loaded
 142  *
 143  * PARAMETERS:  None
 144  *
 145  * RETURN:      TRUE if required ACPI tables are loaded
 146  *
 147  * DESCRIPTION: Determine if the minimum required ACPI tables are present
 148  *              (FADT, FACS, DSDT)
 149  *
 150  ******************************************************************************/
 151
 152 u8 acpi_tb_tables_loaded(void)
 153 {
 154
 155         if (acpi_gbl_root_table_list.count >= 3) {
 156                 return (TRUE);
 157         }
 158
 159         return (FALSE);
 160 }
 161
 162 /*******************************************************************************
 163  *
 164  * FUNCTION:    acpi_tb_print_table_header
 165  *
 166  * PARAMETERS:  Address             - Table physical address
 167  *              Header              - Table header
 168  *
 169  * RETURN:      None
 170  *
 171  * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
 172  *
 173  ******************************************************************************/
 174
 175 void
 176 acpi_tb_print_table_header(acpi_physical_address address,
 177                            struct acpi_table_header *header)
 178 {
 179
 180         /*
 181          * The reason that the Address is cast to a void pointer is so that we
 182          * can use %p which will work properly on both 32-bit and 64-bit hosts.
 183          */
 184         if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
 185
 186                 /* FACS only has signature and length fields */
 187
 188                 ACPI_INFO((AE_INFO, "%4.4s %p %05X",
 189                            header->signature, ACPI_CAST_PTR(void, address),
 190                            header->length));
 191         } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
 192
 193                 /* RSDP has no common fields */
 194
 195                 ACPI_INFO((AE_INFO, "RSDP %p %05X (v%.2d %6.6s)",
 196                            ACPI_CAST_PTR (void, address),
 197                            (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
 198                             revision >
 199                             0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
 200                                                header)->length : 20,
 201                            ACPI_CAST_PTR(struct acpi_table_rsdp,
 202                                          header)->revision,
 203                            ACPI_CAST_PTR(struct acpi_table_rsdp,
 204                                          header)->oem_id));
 205         } else {
 206                 /* Standard ACPI table with full common header */
 207
 208                 ACPI_INFO((AE_INFO,
 209                            "%4.4s %p %05X (v%.2d %6.6s %8.8s %08X %4.4s %08X)",
 210                            header->signature, ACPI_CAST_PTR (void, address),
 211                            header->length, header->revision, header->oem_id,
 212                            header->oem_table_id, header->oem_revision,
 213                            header->asl_compiler_id,
 214                            header->asl_compiler_revision));
 215         }
 216 }
 217
 218 /*******************************************************************************
 219  *
 220  * FUNCTION:    acpi_tb_validate_checksum
 221  *
 222  * PARAMETERS:  Table               - ACPI table to verify
 223  *              Length              - Length of entire table
 224  *
 225  * RETURN:      Status
 226  *
 227  * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
 228  *              exception on bad checksum.
 229  *
 230  ******************************************************************************/
 231
 232 acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
 233 {
 234         u8 checksum;
 235
 236         /* Compute the checksum on the table */
 237
 238         checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
 239
 240         /* Checksum ok? (should be zero) */
 241
 242         if (checksum) {
 243                 ACPI_WARNING((AE_INFO,
 244                               "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X",
 245                               table->signature, table->checksum,
 246                               (u8) (table->checksum - checksum)));
 247
 248 #if (ACPI_CHECKSUM_ABORT)
 249
 250                 return (AE_BAD_CHECKSUM);
 251 #endif
 252         }
 253
 254         return (AE_OK);
 255 }
 256
 257 /*******************************************************************************
 258  *
 259  * FUNCTION:    acpi_tb_checksum
 260  *
 261  * PARAMETERS:  Buffer          - Pointer to memory region to be checked
 262  *              Length          - Length of this memory region
 263  *
 264  * RETURN:      Checksum (u8)
 265  *
 266  * DESCRIPTION: Calculates circular checksum of memory region.
 267  *
 268  ******************************************************************************/
 269
 270 u8 acpi_tb_checksum(u8 *buffer, u32 length)
 271 {
 272         u8 sum = 0;
 273         u8 *end = buffer + length;
 274
 275         while (buffer < end) {
 276                 sum = (u8) (sum + *(buffer++));
 277         }
 278
 279         return sum;
 280 }
 281
 282 /*******************************************************************************
 283  *
 284  * FUNCTION:    acpi_tb_install_table
 285  *
 286  * PARAMETERS:  Address                 - Physical address of DSDT or FACS
 287  *              Signature               - Table signature, NULL if no need to
 288  *                                        match
 289  *              table_index             - Index into root table array
 290  *
 291  * RETURN:      None
 292  *
 293  * DESCRIPTION: Install an ACPI table into the global data structure. The
 294  *              table override mechanism is implemented here to allow the host
 295  *              OS to replace any table before it is installed in the root
 296  *              table array.
 297  *
 298  ******************************************************************************/
 299
 300 void
 301 acpi_tb_install_table(acpi_physical_address address,
 302                       char *signature, u32 table_index)
 303 {
 304         u8 flags;
 305         acpi_status status;
 306         struct acpi_table_header *table_to_install;
 307         struct acpi_table_header *mapped_table;
 308         struct acpi_table_header *override_table = NULL;
 309
 310         if (!address) {
 311                 ACPI_ERROR((AE_INFO,
 312                             "Null physical address for ACPI table [%s]",
 313                             signature));
 314                 return;
 315         }
 316
 317         /* Map just the table header */
 318
 319         mapped_table =
 320             acpi_os_map_memory(address, sizeof(struct acpi_table_header));
 321         if (!mapped_table) {
 322                 return;
 323         }
 324
 325         /* If a particular signature is expected (DSDT/FACS), it must match */
 326
 327         if (signature && !ACPI_COMPARE_NAME(mapped_table->signature, signature)) {
 328                 ACPI_ERROR((AE_INFO,
 329                             "Invalid signature 0x%X for ACPI table, expected [%s]",
 330                             *ACPI_CAST_PTR(u32, mapped_table->signature),
 331                             signature));
 332                 goto unmap_and_exit;
 333         }
 334
 335         /*
 336          * ACPI Table Override:
 337          *
 338          * Before we install the table, let the host OS override it with a new
 339          * one if desired. Any table within the RSDT/XSDT can be replaced,
 340          * including the DSDT which is pointed to by the FADT.
 341          */
 342         status = acpi_os_table_override(mapped_table, &override_table);
 343         if (ACPI_SUCCESS(status) && override_table) {
 344                 ACPI_INFO((AE_INFO,
 345                            "%4.4s @ 0x%p Table override, replaced with:",
 346                            mapped_table->signature, ACPI_CAST_PTR(void,
 347                                                                   address)));
 348
 349                 acpi_gbl_root_table_list.tables[table_index].pointer =
 350                     override_table;
 351                 address = ACPI_PTR_TO_PHYSADDR(override_table);
 352
 353                 table_to_install = override_table;
 354                 flags = ACPI_TABLE_ORIGIN_OVERRIDE;
 355         } else {
 356                 table_to_install = mapped_table;
 357                 flags = ACPI_TABLE_ORIGIN_MAPPED;
 358         }
 359
 360         /* Initialize the table entry */
 361
 362         acpi_gbl_root_table_list.tables[table_index].address = address;
 363         acpi_gbl_root_table_list.tables[table_index].length =
 364             table_to_install->length;
 365         acpi_gbl_root_table_list.tables[table_index].flags = flags;
 366
 367         ACPI_MOVE_32_TO_32(&
 368                            (acpi_gbl_root_table_list.tables[table_index].
 369                             signature), table_to_install->signature);
 370
 371         acpi_tb_print_table_header(address, table_to_install);
 372
 373         if (table_index == ACPI_TABLE_INDEX_DSDT) {
 374
 375                 /* Global integer width is based upon revision of the DSDT */
 376
 377                 acpi_ut_set_integer_width(table_to_install->revision);
 378         }
 379
 380       unmap_and_exit:
 381         acpi_os_unmap_memory(mapped_table, sizeof(struct acpi_table_header));
 382 }
 383
 384 /*******************************************************************************
 385  *
 386  * FUNCTION:    acpi_tb_get_root_table_entry
 387  *
 388  * PARAMETERS:  table_entry         - Pointer to the RSDT/XSDT table entry
 389  *              table_entry_size    - sizeof 32 or 64 (RSDT or XSDT)
 390  *
 391  * RETURN:      Physical address extracted from the root table
 392  *
 393  * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
 394  *              both 32-bit and 64-bit platforms
 395  *
 396  * NOTE:        acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
 397  *              64-bit platforms.
 398  *
 399  ******************************************************************************/
 400
 401 static acpi_physical_address
 402 acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
 403 {
 404         u64 address64;
 405
 406         /*
 407          * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
 408          * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
 409          */
 410         if (table_entry_size == sizeof(u32)) {
 411                 /*
 412                  * 32-bit platform, RSDT: Return 32-bit table entry
 413                  * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
 414                  */
 415                 return ((acpi_physical_address)
 416                         (*ACPI_CAST_PTR(u32, table_entry)));
 417         } else {
 418                 /*
 419                  * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
 420                  * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
 421                  *  return 64-bit
 422                  */
 423                 ACPI_MOVE_64_TO_64(&address64, table_entry);
 424
 425 #if ACPI_MACHINE_WIDTH == 32
 426                 if (address64 > ACPI_UINT32_MAX) {
 427
 428                         /* Will truncate 64-bit address to 32 bits, issue warning */
 429
 430                         ACPI_WARNING((AE_INFO,
 431                                       "64-bit Physical Address in XSDT is too large (%8.8X%8.8X),"
 432                                       " truncating",
 433                                       ACPI_FORMAT_UINT64(address64)));
 434                 }
 435 #endif
 436                 return ((acpi_physical_address) (address64));
 437         }
 438 }
 439
 440 /*******************************************************************************
 441  *
 442  * FUNCTION:    acpi_tb_parse_root_table
 443  *
 444  * PARAMETERS:  Rsdp                    - Pointer to the RSDP
 445  *
 446  * RETURN:      Status
 447  *
 448  * DESCRIPTION: This function is called to parse the Root System Description
 449  *              Table (RSDT or XSDT)
 450  *
 451  * NOTE:        Tables are mapped (not copied) for efficiency. The FACS must
 452  *              be mapped and cannot be copied because it contains the actual
 453  *              memory location of the ACPI Global Lock.
 454  *
 455  ******************************************************************************/
 456
 457 acpi_status __init
 458 acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
 459 {
 460         struct acpi_table_rsdp *rsdp;
 461         u32 table_entry_size;
 462         u32 i;
 463         u32 table_count;
 464         struct acpi_table_header *table;
 465         acpi_physical_address address;
 466         acpi_physical_address uninitialized_var(rsdt_address);
 467         u32 length;
 468         u8 *table_entry;
 469         acpi_status status;
 470
 471         ACPI_FUNCTION_TRACE(tb_parse_root_table);
 472
 473         /*
 474          * Map the entire RSDP and extract the address of the RSDT or XSDT
 475          */
 476         rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
 477         if (!rsdp) {
 478                 return_ACPI_STATUS(AE_NO_MEMORY);
 479         }
 480
 481         acpi_tb_print_table_header(rsdp_address,
 482                                    ACPI_CAST_PTR(struct acpi_table_header,
 483                                                  rsdp));
 484
 485         /* Differentiate between RSDT and XSDT root tables */
 486
 487         if (rsdp->revision > 1 && rsdp->xsdt_physical_address
 488                         && !acpi_rsdt_forced) {
 489                 /*
 490                  * Root table is an XSDT (64-bit physical addresses). We must use the
 491                  * XSDT if the revision is > 1 and the XSDT pointer is present, as per
 492                  * the ACPI specification.
 493                  */
 494                 address = (acpi_physical_address) rsdp->xsdt_physical_address;
 495                 table_entry_size = sizeof(u64);
 496                 rsdt_address = (acpi_physical_address)
 497                                         rsdp->rsdt_physical_address;
 498         } else {
 499                 /* Root table is an RSDT (32-bit physical addresses) */
 500
 501                 address = (acpi_physical_address) rsdp->rsdt_physical_address;
 502                 table_entry_size = sizeof(u32);
 503         }
 504
 505         /*
 506          * It is not possible to map more than one entry in some environments,
 507          * so unmap the RSDP here before mapping other tables
 508          */
 509         acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
 510
 511         if (table_entry_size == sizeof(u64)) {
 512                 if (acpi_tb_check_xsdt(address) == AE_NULL_ENTRY) {
 513                         /* XSDT has NULL entry, RSDT is used */
 514                         address = rsdt_address;
 515                         table_entry_size = sizeof(u32);
 516                         ACPI_WARNING((AE_INFO, "BIOS XSDT has NULL entry, "
 517                                         "using RSDT"));
 518                 }
 519         }
 520         /* Map the RSDT/XSDT table header to get the full table length */
 521
 522         table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
 523         if (!table) {
 524                 return_ACPI_STATUS(AE_NO_MEMORY);
 525         }
 526
 527         acpi_tb_print_table_header(address, table);
 528
 529         /* Get the length of the full table, verify length and map entire table */
 530
 531         length = table->length;
 532         acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
 533
 534         if (length < sizeof(struct acpi_table_header)) {
 535                 ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
 536                             length));
 537                 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 538         }
 539
 540         table = acpi_os_map_memory(address, length);
 541         if (!table) {
 542                 return_ACPI_STATUS(AE_NO_MEMORY);
 543         }
 544
 545         /* Validate the root table checksum */
 546
 547         status = acpi_tb_verify_checksum(table, length);
 548         if (ACPI_FAILURE(status)) {
 549                 acpi_os_unmap_memory(table, length);
 550                 return_ACPI_STATUS(status);
 551         }
 552
 553         /* Calculate the number of tables described in the root table */
 554
 555         table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
 556                             table_entry_size);
 557         /*
 558          * First two entries in the table array are reserved for the DSDT
 559          * and FACS, which are not actually present in the RSDT/XSDT - they
 560          * come from the FADT
 561          */
 562         table_entry =
 563             ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
 564         acpi_gbl_root_table_list.count = 2;
 565
 566         /*
 567          * Initialize the root table array from the RSDT/XSDT
 568          */
 569         for (i = 0; i < table_count; i++) {
 570                 if (acpi_gbl_root_table_list.count >=
 571                     acpi_gbl_root_table_list.size) {
 572
 573                         /* There is no more room in the root table array, attempt resize */
 574
 575                         status = acpi_tb_resize_root_table_list();
 576                         if (ACPI_FAILURE(status)) {
 577                                 ACPI_WARNING((AE_INFO,
 578                                               "Truncating %u table entries!",
 579                                               (unsigned) (table_count -
 580                                                (acpi_gbl_root_table_list.
 581                                                count - 2))));
 582                                 break;
 583                         }
 584                 }
 585
 586                 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
 587
 588                 acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
 589                     address =
 590                     acpi_tb_get_root_table_entry(table_entry, table_entry_size);
 591
 592                 table_entry += table_entry_size;
 593                 acpi_gbl_root_table_list.count++;
 594         }
 595
 596         /*
 597          * It is not possible to map more than one entry in some environments,
 598          * so unmap the root table here before mapping other tables
 599          */
 600         acpi_os_unmap_memory(table, length);
 601
 602         /*
 603          * Complete the initialization of the root table array by examining
 604          * the header of each table
 605          */
 606         for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
 607                 acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
 608                                       address, NULL, i);
 609
 610                 /* Special case for FADT - get the DSDT and FACS */
 611
 612                 if (ACPI_COMPARE_NAME
 613                     (&acpi_gbl_root_table_list.tables[i].signature,
 614                      ACPI_SIG_FADT)) {
 615                         acpi_tb_parse_fadt(i);
 616                 }
 617         }
 618
 619         return_ACPI_STATUS(AE_OK);
 620 }