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         if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
 181
 182                 /* FACS only has signature and length fields of common table header */
 183
 184                 ACPI_INFO((AE_INFO, "%4.4s %08lX, %04X",
 185                            header->signature, (unsigned long)address,
 186                            header->length));
 187         } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
 188
 189                 /* RSDP has no common fields */
 190
 191                 ACPI_INFO((AE_INFO, "RSDP %08lX, %04X (r%d %6.6s)",
 192                            (unsigned long)address,
 193                            (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
 194                             revision >
 195                             0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
 196                                                header)->length : 20,
 197                            ACPI_CAST_PTR(struct acpi_table_rsdp,
 198                                          header)->revision,
 199                            ACPI_CAST_PTR(struct acpi_table_rsdp,
 200                                          header)->oem_id));
 201         } else {
 202                 /* Standard ACPI table with full common header */
 203
 204                 ACPI_INFO((AE_INFO,
 205                            "%4.4s %08lX, %04X (r%d %6.6s %8.8s %8X %4.4s %8X)",
 206                            header->signature, (unsigned long)address,
 207                            header->length, header->revision, header->oem_id,
 208                            header->oem_table_id, header->oem_revision,
 209                            header->asl_compiler_id,
 210                            header->asl_compiler_revision));
 211         }
 212 }
 213
 214 /*******************************************************************************
 215  *
 216  * FUNCTION:    acpi_tb_validate_checksum
 217  *
 218  * PARAMETERS:  Table               - ACPI table to verify
 219  *              Length              - Length of entire table
 220  *
 221  * RETURN:      Status
 222  *
 223  * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
 224  *              exception on bad checksum.
 225  *
 226  ******************************************************************************/
 227
 228 acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
 229 {
 230         u8 checksum;
 231
 232         /* Compute the checksum on the table */
 233
 234         checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
 235
 236         /* Checksum ok? (should be zero) */
 237
 238         if (checksum) {
 239                 ACPI_WARNING((AE_INFO,
 240                               "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X",
 241                               table->signature, table->checksum,
 242                               (u8) (table->checksum - checksum)));
 243
 244 #if (ACPI_CHECKSUM_ABORT)
 245
 246                 return (AE_BAD_CHECKSUM);
 247 #endif
 248         }
 249
 250         return (AE_OK);
 251 }
 252
 253 /*******************************************************************************
 254  *
 255  * FUNCTION:    acpi_tb_checksum
 256  *
 257  * PARAMETERS:  Buffer          - Pointer to memory region to be checked
 258  *              Length          - Length of this memory region
 259  *
 260  * RETURN:      Checksum (u8)
 261  *
 262  * DESCRIPTION: Calculates circular checksum of memory region.
 263  *
 264  ******************************************************************************/
 265
 266 u8 acpi_tb_checksum(u8 *buffer, u32 length)
 267 {
 268         u8 sum = 0;
 269         u8 *end = buffer + length;
 270
 271         while (buffer < end) {
 272                 sum = (u8) (sum + *(buffer++));
 273         }
 274
 275         return sum;
 276 }
 277
 278 /*******************************************************************************
 279  *
 280  * FUNCTION:    acpi_tb_install_table
 281  *
 282  * PARAMETERS:  Address                 - Physical address of DSDT or FACS
 283  *              Flags                   - Flags
 284  *              Signature               - Table signature, NULL if no need to
 285  *                                        match
 286  *              table_index             - Index into root table array
 287  *
 288  * RETURN:      None
 289  *
 290  * DESCRIPTION: Install an ACPI table into the global data structure.
 291  *
 292  ******************************************************************************/
 293
 294 void
 295 acpi_tb_install_table(acpi_physical_address address,
 296                       u8 flags, char *signature, u32 table_index)
 297 {
 298         struct acpi_table_header *table;
 299
 300         if (!address) {
 301                 ACPI_ERROR((AE_INFO,
 302                             "Null physical address for ACPI table [%s]",
 303                             signature));
 304                 return;
 305         }
 306
 307         /* Map just the table header */
 308
 309         table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
 310         if (!table) {
 311                 return;
 312         }
 313
 314         /* If a particular signature is expected, signature must match */
 315
 316         if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
 317                 ACPI_ERROR((AE_INFO,
 318                             "Invalid signature 0x%X for ACPI table [%s]",
 319                             *ACPI_CAST_PTR(u32, table->signature), signature));
 320                 goto unmap_and_exit;
 321         }
 322
 323         /* Initialize the table entry */
 324
 325         acpi_gbl_root_table_list.tables[table_index].address = address;
 326         acpi_gbl_root_table_list.tables[table_index].length = table->length;
 327         acpi_gbl_root_table_list.tables[table_index].flags = flags;
 328
 329         ACPI_MOVE_32_TO_32(&
 330                            (acpi_gbl_root_table_list.tables[table_index].
 331                             signature), table->signature);
 332
 333         acpi_tb_print_table_header(address, table);
 334
 335         if (table_index == ACPI_TABLE_INDEX_DSDT) {
 336
 337                 /* Global integer width is based upon revision of the DSDT */
 338
 339                 acpi_ut_set_integer_width(table->revision);
 340         }
 341
 342       unmap_and_exit:
 343         acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
 344 }
 345
 346 /*******************************************************************************
 347  *
 348  * FUNCTION:    acpi_tb_get_root_table_entry
 349  *
 350  * PARAMETERS:  table_entry         - Pointer to the RSDT/XSDT table entry
 351  *              table_entry_size    - sizeof 32 or 64 (RSDT or XSDT)
 352  *
 353  * RETURN:      Physical address extracted from the root table
 354  *
 355  * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
 356  *              both 32-bit and 64-bit platforms
 357  *
 358  * NOTE:        acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
 359  *              64-bit platforms.
 360  *
 361  ******************************************************************************/
 362
 363 static acpi_physical_address
 364 acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
 365 {
 366         u64 address64;
 367
 368         /*
 369          * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
 370          * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
 371          */
 372         if (table_entry_size == sizeof(u32)) {
 373                 /*
 374                  * 32-bit platform, RSDT: Return 32-bit table entry
 375                  * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
 376                  */
 377                 return ((acpi_physical_address)
 378                         (*ACPI_CAST_PTR(u32, table_entry)));
 379         } else {
 380                 /*
 381                  * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
 382                  * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, return 64-bit
 383                  */
 384                 ACPI_MOVE_64_TO_64(&address64, table_entry);
 385
 386 #if ACPI_MACHINE_WIDTH == 32
 387                 if (address64 > ACPI_UINT32_MAX) {
 388
 389                         /* Will truncate 64-bit address to 32 bits, issue warning */
 390
 391                         ACPI_WARNING((AE_INFO,
 392                                       "64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating",
 393                                       ACPI_FORMAT_UINT64(address64)));
 394                 }
 395 #endif
 396                 return ((acpi_physical_address) (address64));
 397         }
 398 }
 399
 400 /*******************************************************************************
 401  *
 402  * FUNCTION:    acpi_tb_parse_root_table
 403  *
 404  * PARAMETERS:  Rsdp                    - Pointer to the RSDP
 405  *              Flags                   - Flags
 406  *
 407  * RETURN:      Status
 408  *
 409  * DESCRIPTION: This function is called to parse the Root System Description
 410  *              Table (RSDT or XSDT)
 411  *
 412  * NOTE:        Tables are mapped (not copied) for efficiency. The FACS must
 413  *              be mapped and cannot be copied because it contains the actual
 414  *              memory location of the ACPI Global Lock.
 415  *
 416  ******************************************************************************/
 417
 418 acpi_status __init
 419 acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
 420 {
 421         struct acpi_table_rsdp *rsdp;
 422         u32 table_entry_size;
 423         u32 i;
 424         u32 table_count;
 425         struct acpi_table_header *table;
 426         acpi_physical_address address;
 427         acpi_physical_address uninitialized_var(rsdt_address);
 428         u32 length;
 429         u8 *table_entry;
 430         acpi_status status;
 431
 432         ACPI_FUNCTION_TRACE(tb_parse_root_table);
 433
 434         /*
 435          * Map the entire RSDP and extract the address of the RSDT or XSDT
 436          */
 437         rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
 438         if (!rsdp) {
 439                 return_ACPI_STATUS(AE_NO_MEMORY);
 440         }
 441
 442         acpi_tb_print_table_header(rsdp_address,
 443                                    ACPI_CAST_PTR(struct acpi_table_header,
 444                                                  rsdp));
 445
 446         /* Differentiate between RSDT and XSDT root tables */
 447
 448         if (rsdp->revision > 1 && rsdp->xsdt_physical_address) {
 449                 /*
 450                  * Root table is an XSDT (64-bit physical addresses). We must use the
 451                  * XSDT if the revision is > 1 and the XSDT pointer is present, as per
 452                  * the ACPI specification.
 453                  */
 454                 address = (acpi_physical_address) rsdp->xsdt_physical_address;
 455                 table_entry_size = sizeof(u64);
 456                 rsdt_address = (acpi_physical_address)
 457                                         rsdp->rsdt_physical_address;
 458         } else {
 459                 /* Root table is an RSDT (32-bit physical addresses) */
 460
 461                 address = (acpi_physical_address) rsdp->rsdt_physical_address;
 462                 table_entry_size = sizeof(u32);
 463         }
 464
 465         /*
 466          * It is not possible to map more than one entry in some environments,
 467          * so unmap the RSDP here before mapping other tables
 468          */
 469         acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
 470
 471         if (table_entry_size == sizeof(u64)) {
 472                 if (acpi_tb_check_xsdt(address) == AE_NULL_ENTRY) {
 473                         /* XSDT has NULL entry, RSDT is used */
 474                         address = rsdt_address;
 475                         table_entry_size = sizeof(u32);
 476                         ACPI_WARNING((AE_INFO, "BIOS XSDT has NULL entry, "
 477                                         "using RSDT"));
 478                 }
 479         }
 480         /* Map the RSDT/XSDT table header to get the full table length */
 481
 482         table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
 483         if (!table) {
 484                 return_ACPI_STATUS(AE_NO_MEMORY);
 485         }
 486
 487         acpi_tb_print_table_header(address, table);
 488
 489         /* Get the length of the full table, verify length and map entire table */
 490
 491         length = table->length;
 492         acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
 493
 494         if (length < sizeof(struct acpi_table_header)) {
 495                 ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
 496                             length));
 497                 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 498         }
 499
 500         table = acpi_os_map_memory(address, length);
 501         if (!table) {
 502                 return_ACPI_STATUS(AE_NO_MEMORY);
 503         }
 504
 505         /* Validate the root table checksum */
 506
 507         status = acpi_tb_verify_checksum(table, length);
 508         if (ACPI_FAILURE(status)) {
 509                 acpi_os_unmap_memory(table, length);
 510                 return_ACPI_STATUS(status);
 511         }
 512
 513         /* Calculate the number of tables described in the root table */
 514
 515         table_count =
 516             (u32) ((table->length -
 517                     sizeof(struct acpi_table_header)) / table_entry_size);
 518
 519         /*
 520          * First two entries in the table array are reserved for the DSDT and FACS,
 521          * which are not actually present in the RSDT/XSDT - they come from the FADT
 522          */
 523         table_entry =
 524             ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
 525         acpi_gbl_root_table_list.count = 2;
 526
 527         /*
 528          * Initialize the root table array from the RSDT/XSDT
 529          */
 530         for (i = 0; i < table_count; i++) {
 531                 if (acpi_gbl_root_table_list.count >=
 532                     acpi_gbl_root_table_list.size) {
 533
 534                         /* There is no more room in the root table array, attempt resize */
 535
 536                         status = acpi_tb_resize_root_table_list();
 537                         if (ACPI_FAILURE(status)) {
 538                                 ACPI_WARNING((AE_INFO,
 539                                               "Truncating %u table entries!",
 540                                               (unsigned)
 541                                               (acpi_gbl_root_table_list.size -
 542                                                acpi_gbl_root_table_list.
 543                                                count)));
 544                                 break;
 545                         }
 546                 }
 547
 548                 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
 549
 550                 acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
 551                     address =
 552                     acpi_tb_get_root_table_entry(table_entry, table_entry_size);
 553
 554                 table_entry += table_entry_size;
 555                 acpi_gbl_root_table_list.count++;
 556         }
 557
 558         /*
 559          * It is not possible to map more than one entry in some environments,
 560          * so unmap the root table here before mapping other tables
 561          */
 562         acpi_os_unmap_memory(table, length);
 563
 564         /*
 565          * Complete the initialization of the root table array by examining
 566          * the header of each table
 567          */
 568         for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
 569                 acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
 570                                       address, flags, NULL, i);
 571
 572                 /* Special case for FADT - get the DSDT and FACS */
 573
 574                 if (ACPI_COMPARE_NAME
 575                     (&acpi_gbl_root_table_list.tables[i].signature,
 576                      ACPI_SIG_FADT)) {
 577                         acpi_tb_parse_fadt(i, flags);
 578                 }
 579         }
 580
 581         return_ACPI_STATUS(AE_OK);
 582 }