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

   1 /******************************************************************************
   2  *
   3  * Module Name: tbutils   - table utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, R. Byron Moore
   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 <acpi/actables.h>
  46
  47 #define _COMPONENT          ACPI_TABLES
  48 ACPI_MODULE_NAME("tbutils")
  49
  50 /* Local prototypes */
  51 static acpi_physical_address
  52 acpi_tb_get_root_table_entry(u8 * table_entry,
  53                              acpi_native_uint table_entry_size);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_tb_print_table_header
  58  *
  59  * PARAMETERS:  Address             - Table physical address
  60  *              Header              - Table header
  61  *
  62  * RETURN:      None
  63  *
  64  * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
  65  *
  66  ******************************************************************************/
  67
  68 void
  69 acpi_tb_print_table_header(acpi_physical_address address,
  70                            struct acpi_table_header *header)
  71 {
  72
  73         if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
  74
  75                 /* FACS only has signature and length fields of common table header */
  76
  77                 ACPI_INFO((AE_INFO, "%4.4s @ 0x%p/0x%04X",
  78                            header->signature, ACPI_CAST_PTR(void, address),
  79                            header->length));
  80         } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
  81
  82                 /* RSDP has no common fields */
  83
  84                 ACPI_INFO((AE_INFO, "RSDP @ 0x%p/0x%04X (v%3.3d %6.6s)",
  85                            ACPI_CAST_PTR(void, address),
  86                            (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
  87                             revision >
  88                             0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
  89                                                header)->length : 20,
  90                            ACPI_CAST_PTR(struct acpi_table_rsdp,
  91                                          header)->revision,
  92                            ACPI_CAST_PTR(struct acpi_table_rsdp,
  93                                          header)->oem_id));
  94         } else {
  95                 /* Standard ACPI table with full common header */
  96
  97                 ACPI_INFO((AE_INFO,
  98                            "%4.4s @ 0x%p/0x%04X (v%3.3d %6.6s %8.8s 0x%08X %4.4s 0x%08X)",
  99                            header->signature, ACPI_CAST_PTR(void, address),
 100                            header->length, header->revision, header->oem_id,
 101                            header->oem_table_id, header->oem_revision,
 102                            header->asl_compiler_id,
 103                            header->asl_compiler_revision));
 104         }
 105 }
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    acpi_tb_validate_checksum
 110  *
 111  * PARAMETERS:  Table               - ACPI table to verify
 112  *              Length              - Length of entire table
 113  *
 114  * RETURN:      Status
 115  *
 116  * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
 117  *              exception on bad checksum.
 118  *
 119  ******************************************************************************/
 120
 121 acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
 122 {
 123         u8 checksum;
 124
 125         /* Compute the checksum on the table */
 126
 127         checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
 128
 129         /* Checksum ok? (should be zero) */
 130
 131         if (checksum) {
 132                 ACPI_WARNING((AE_INFO,
 133                               "Incorrect checksum in table [%4.4s] -  %2.2X, should be %2.2X",
 134                               table->signature, table->checksum,
 135                               (u8) (table->checksum - checksum)));
 136
 137 #if (ACPI_CHECKSUM_ABORT)
 138
 139                 return (AE_BAD_CHECKSUM);
 140 #endif
 141         }
 142
 143         return (AE_OK);
 144 }
 145
 146 /*******************************************************************************
 147  *
 148  * FUNCTION:    acpi_tb_checksum
 149  *
 150  * PARAMETERS:  Buffer          - Pointer to memory region to be checked
 151  *              Length          - Length of this memory region
 152  *
 153  * RETURN:      Checksum (u8)
 154  *
 155  * DESCRIPTION: Calculates circular checksum of memory region.
 156  *
 157  ******************************************************************************/
 158
 159 u8 acpi_tb_checksum(u8 * buffer, acpi_native_uint length)
 160 {
 161         u8 sum = 0;
 162         u8 *end = buffer + length;
 163
 164         while (buffer < end) {
 165                 sum = (u8) (sum + *(buffer++));
 166         }
 167
 168         return sum;
 169 }
 170
 171 /*******************************************************************************
 172  *
 173  * FUNCTION:    acpi_tb_install_table
 174  *
 175  * PARAMETERS:  Address                 - Physical address of DSDT or FACS
 176  *              Flags                   - Flags
 177  *              Signature               - Table signature, NULL if no need to
 178  *                                        match
 179  *              table_index             - Index into root table array
 180  *
 181  * RETURN:      None
 182  *
 183  * DESCRIPTION: Install an ACPI table into the global data structure.
 184  *
 185  ******************************************************************************/
 186
 187 void
 188 acpi_tb_install_table(acpi_physical_address address,
 189                       u8 flags, char *signature, acpi_native_uint table_index)
 190 {
 191         struct acpi_table_header *table;
 192
 193         if (!address) {
 194                 ACPI_ERROR((AE_INFO,
 195                             "Null physical address for ACPI table [%s]",
 196                             signature));
 197                 return;
 198         }
 199
 200         /* Map just the table header */
 201
 202         table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
 203         if (!table) {
 204                 return;
 205         }
 206
 207         /* If a particular signature is expected, signature must match */
 208
 209         if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
 210                 ACPI_ERROR((AE_INFO,
 211                             "Invalid signature 0x%X for ACPI table [%s]",
 212                             *ACPI_CAST_PTR(u32, table->signature), signature));
 213                 goto unmap_and_exit;
 214         }
 215
 216         /* Initialize the table entry */
 217
 218         acpi_gbl_root_table_list.tables[table_index].address = address;
 219         acpi_gbl_root_table_list.tables[table_index].length = table->length;
 220         acpi_gbl_root_table_list.tables[table_index].flags = flags;
 221
 222         ACPI_MOVE_32_TO_32(&
 223                            (acpi_gbl_root_table_list.tables[table_index].
 224                             signature), table->signature);
 225
 226         acpi_tb_print_table_header(address, table);
 227
 228         if (table_index == ACPI_TABLE_INDEX_DSDT) {
 229
 230                 /* Global integer width is based upon revision of the DSDT */
 231
 232                 acpi_ut_set_integer_width(table->revision);
 233         }
 234
 235       unmap_and_exit:
 236         acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
 237 }
 238
 239 /*******************************************************************************
 240  *
 241  * FUNCTION:    acpi_tb_get_root_table_entry
 242  *
 243  * PARAMETERS:  table_entry         - Pointer to the RSDT/XSDT table entry
 244  *              table_entry_size    - sizeof 32 or 64 (RSDT or XSDT)
 245  *
 246  * RETURN:      Physical address extracted from the root table
 247  *
 248  * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
 249  *              both 32-bit and 64-bit platforms
 250  *
 251  * NOTE:        acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
 252  *              64-bit platforms.
 253  *
 254  ******************************************************************************/
 255
 256 static acpi_physical_address
 257 acpi_tb_get_root_table_entry(u8 * table_entry,
 258                              acpi_native_uint table_entry_size)
 259 {
 260         u64 address64;
 261
 262         /*
 263          * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
 264          * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
 265          */
 266         if (table_entry_size == sizeof(u32)) {
 267                 /*
 268                  * 32-bit platform, RSDT: Return 32-bit table entry
 269                  * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
 270                  */
 271                 return ((acpi_physical_address)
 272                         (*ACPI_CAST_PTR(u32, table_entry)));
 273         } else {
 274                 /*
 275                  * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
 276                  * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, return 64-bit
 277                  */
 278                 ACPI_MOVE_64_TO_64(&address64, table_entry);
 279
 280 #if ACPI_MACHINE_WIDTH == 32
 281                 if (address64 > ACPI_UINT32_MAX) {
 282
 283                         /* Will truncate 64-bit address to 32 bits, issue warning */
 284
 285                         ACPI_WARNING((AE_INFO,
 286                                       "64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating",
 287                                       ACPI_FORMAT_UINT64(address64)));
 288                 }
 289 #endif
 290                 return ((acpi_physical_address) (address64));
 291         }
 292 }
 293
 294 /*******************************************************************************
 295  *
 296  * FUNCTION:    acpi_tb_parse_root_table
 297  *
 298  * PARAMETERS:  Rsdp                    - Pointer to the RSDP
 299  *              Flags                   - Flags
 300  *
 301  * RETURN:      Status
 302  *
 303  * DESCRIPTION: This function is called to parse the Root System Description
 304  *              Table (RSDT or XSDT)
 305  *
 306  * NOTE:        Tables are mapped (not copied) for efficiency. The FACS must
 307  *              be mapped and cannot be copied because it contains the actual
 308  *              memory location of the ACPI Global Lock.
 309  *
 310  ******************************************************************************/
 311
 312 acpi_status __init
 313 acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
 314 {
 315         struct acpi_table_rsdp *rsdp;
 316         acpi_native_uint table_entry_size;
 317         acpi_native_uint i;
 318         u32 table_count;
 319         struct acpi_table_header *table;
 320         acpi_physical_address address;
 321         u32 length;
 322         u8 *table_entry;
 323         acpi_status status;
 324
 325         ACPI_FUNCTION_TRACE(tb_parse_root_table);
 326
 327         /*
 328          * Map the entire RSDP and extract the address of the RSDT or XSDT
 329          */
 330         rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
 331         if (!rsdp) {
 332                 return_ACPI_STATUS(AE_NO_MEMORY);
 333         }
 334
 335         acpi_tb_print_table_header(rsdp_address,
 336                                    ACPI_CAST_PTR(struct acpi_table_header,
 337                                                  rsdp));
 338
 339         /* Differentiate between RSDT and XSDT root tables */
 340
 341         if (rsdp->revision > 1 && rsdp->xsdt_physical_address) {
 342                 /*
 343                  * Root table is an XSDT (64-bit physical addresses). We must use the
 344                  * XSDT if the revision is > 1 and the XSDT pointer is present, as per
 345                  * the ACPI specification.
 346                  */
 347                 address = (acpi_physical_address) rsdp->xsdt_physical_address;
 348                 table_entry_size = sizeof(u64);
 349         } else {
 350                 /* Root table is an RSDT (32-bit physical addresses) */
 351
 352                 address = (acpi_physical_address) rsdp->rsdt_physical_address;
 353                 table_entry_size = sizeof(u32);
 354         }
 355
 356         /*
 357          * It is not possible to map more than one entry in some environments,
 358          * so unmap the RSDP here before mapping other tables
 359          */
 360         acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
 361
 362         /* Map the RSDT/XSDT table header to get the full table length */
 363
 364         table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
 365         if (!table) {
 366                 return_ACPI_STATUS(AE_NO_MEMORY);
 367         }
 368
 369         acpi_tb_print_table_header(address, table);
 370
 371         /* Get the length of the full table, verify length and map entire table */
 372
 373         length = table->length;
 374         acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
 375
 376         if (length < sizeof(struct acpi_table_header)) {
 377                 ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
 378                             length));
 379                 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 380         }
 381
 382         table = acpi_os_map_memory(address, length);
 383         if (!table) {
 384                 return_ACPI_STATUS(AE_NO_MEMORY);
 385         }
 386
 387         /* Validate the root table checksum */
 388
 389         status = acpi_tb_verify_checksum(table, length);
 390         if (ACPI_FAILURE(status)) {
 391                 acpi_os_unmap_memory(table, length);
 392                 return_ACPI_STATUS(status);
 393         }
 394
 395         /* Calculate the number of tables described in the root table */
 396
 397         table_count =
 398             (u32) ((table->length -
 399                     sizeof(struct acpi_table_header)) / table_entry_size);
 400
 401         /*
 402          * First two entries in the table array are reserved for the DSDT and FACS,
 403          * which are not actually present in the RSDT/XSDT - they come from the FADT
 404          */
 405         table_entry =
 406             ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
 407         acpi_gbl_root_table_list.count = 2;
 408
 409         /*
 410          * Initialize the root table array from the RSDT/XSDT
 411          */
 412         for (i = 0; i < table_count; i++) {
 413                 if (acpi_gbl_root_table_list.count >=
 414                     acpi_gbl_root_table_list.size) {
 415
 416                         /* There is no more room in the root table array, attempt resize */
 417
 418                         status = acpi_tb_resize_root_table_list();
 419                         if (ACPI_FAILURE(status)) {
 420                                 ACPI_WARNING((AE_INFO,
 421                                               "Truncating %u table entries!",
 422                                               (unsigned)
 423                                               (acpi_gbl_root_table_list.size -
 424                                                acpi_gbl_root_table_list.
 425                                                count)));
 426                                 break;
 427                         }
 428                 }
 429
 430                 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
 431
 432                 acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
 433                     address =
 434                     acpi_tb_get_root_table_entry(table_entry, table_entry_size);
 435
 436                 table_entry += table_entry_size;
 437                 acpi_gbl_root_table_list.count++;
 438         }
 439
 440         /*
 441          * It is not possible to map more than one entry in some environments,
 442          * so unmap the root table here before mapping other tables
 443          */
 444         acpi_os_unmap_memory(table, length);
 445
 446         /*
 447          * Complete the initialization of the root table array by examining
 448          * the header of each table
 449          */
 450         for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
 451                 acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
 452                                       address, flags, NULL, i);
 453
 454                 /* Special case for FADT - get the DSDT and FACS */
 455
 456                 if (ACPI_COMPARE_NAME
 457                     (&acpi_gbl_root_table_list.tables[i].signature,
 458                      ACPI_SIG_FADT)) {
 459                         acpi_tb_parse_fadt(i, flags);
 460                 }
 461         }
 462
 463         return_ACPI_STATUS(AE_OK);
 464 }
 465
 466 /******************************************************************************
 467  *
 468  * FUNCTION:    acpi_tb_map
 469  *
 470  * PARAMETERS:  Address             - Address to be mapped
 471  *              Length              - Length to be mapped
 472  *              Flags               - Logical or physical addressing mode
 473  *
 474  * RETURN:      Pointer to mapped region
 475  *
 476  * DESCRIPTION: Maps memory according to flag
 477  *
 478  *****************************************************************************/
 479
 480 void *acpi_tb_map(acpi_physical_address address, u32 length, u32 flags)
 481 {
 482
 483         if (flags == ACPI_TABLE_ORIGIN_MAPPED) {
 484                 return (acpi_os_map_memory(address, length));
 485         } else {
 486                 return (ACPI_CAST_PTR(void, address));
 487         }
 488 }
 489
 490 /******************************************************************************
 491  *
 492  * FUNCTION:    acpi_tb_unmap
 493  *
 494  * PARAMETERS:  Pointer             - To mapped region
 495  *              Length              - Length to be unmapped
 496  *              Flags               - Logical or physical addressing mode
 497  *
 498  * RETURN:      None
 499  *
 500  * DESCRIPTION: Unmaps memory according to flag
 501  *
 502  *****************************************************************************/
 503
 504 void acpi_tb_unmap(void *pointer, u32 length, u32 flags)
 505 {
 506
 507         if (flags == ACPI_TABLE_ORIGIN_MAPPED) {
 508                 acpi_os_unmap_memory(pointer, length);
 509         }
 510 }