drivers/acpi/tables/tbutils.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbutils   - table utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, 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_tables_loaded
  58  *
  59  * PARAMETERS:  None
  60  *
  61  * RETURN:      TRUE if required ACPI tables are loaded
  62  *
  63  * DESCRIPTION: Determine if the minimum required ACPI tables are present
  64  *              (FADT, FACS, DSDT)
  65  *
  66  ******************************************************************************/
  67
  68 u8 acpi_tb_tables_loaded(void)
  69 {
  70
  71         if (acpi_gbl_root_table_list.count >= 3) {
  72                 return (TRUE);
  73         }
  74
  75         return (FALSE);
  76 }
  77
  78 /*******************************************************************************
  79  *
  80  * FUNCTION:    acpi_tb_print_table_header
  81  *
  82  * PARAMETERS:  Address             - Table physical address
  83  *              Header              - Table header
  84  *
  85  * RETURN:      None
  86  *
  87  * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
  88  *
  89  ******************************************************************************/
  90
  91 void
  92 acpi_tb_print_table_header(acpi_physical_address address,
  93                            struct acpi_table_header *header)
  94 {
  95
  96         if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
  97
  98                 /* FACS only has signature and length fields of common table header */
  99
 100                 ACPI_INFO((AE_INFO, "%4.4s %08lX, %04X",
 101                            header->signature, (unsigned long)address,
 102                            header->length));
 103         } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
 104
 105                 /* RSDP has no common fields */
 106
 107                 ACPI_INFO((AE_INFO, "RSDP %08lX, %04X (r%d %6.6s)",
 108                            (unsigned long)address,
 109                            (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
 110                             revision >
 111                             0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
 112                                                header)->length : 20,
 113                            ACPI_CAST_PTR(struct acpi_table_rsdp,
 114                                          header)->revision,
 115                            ACPI_CAST_PTR(struct acpi_table_rsdp,
 116                                          header)->oem_id));
 117         } else {
 118                 /* Standard ACPI table with full common header */
 119
 120                 ACPI_INFO((AE_INFO,
 121                            "%4.4s %08lX, %04X (r%d %6.6s %8.8s %8X %4.4s %8X)",
 122                            header->signature, (unsigned long)address,
 123                            header->length, header->revision, header->oem_id,
 124                            header->oem_table_id, header->oem_revision,
 125                            header->asl_compiler_id,
 126                            header->asl_compiler_revision));
 127         }
 128 }
 129
 130 /*******************************************************************************
 131  *
 132  * FUNCTION:    acpi_tb_validate_checksum
 133  *
 134  * PARAMETERS:  Table               - ACPI table to verify
 135  *              Length              - Length of entire table
 136  *
 137  * RETURN:      Status
 138  *
 139  * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
 140  *              exception on bad checksum.
 141  *
 142  ******************************************************************************/
 143
 144 acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
 145 {
 146         u8 checksum;
 147
 148         /* Compute the checksum on the table */
 149
 150         checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
 151
 152         /* Checksum ok? (should be zero) */
 153
 154         if (checksum) {
 155                 ACPI_WARNING((AE_INFO,
 156                               "Incorrect checksum in table [%4.4s] -  %2.2X, should be %2.2X",
 157                               table->signature, table->checksum,
 158                               (u8) (table->checksum - checksum)));
 159
 160 #if (ACPI_CHECKSUM_ABORT)
 161
 162                 return (AE_BAD_CHECKSUM);
 163 #endif
 164         }
 165
 166         return (AE_OK);
 167 }
 168
 169 /*******************************************************************************
 170  *
 171  * FUNCTION:    acpi_tb_checksum
 172  *
 173  * PARAMETERS:  Buffer          - Pointer to memory region to be checked
 174  *              Length          - Length of this memory region
 175  *
 176  * RETURN:      Checksum (u8)
 177  *
 178  * DESCRIPTION: Calculates circular checksum of memory region.
 179  *
 180  ******************************************************************************/
 181
 182 u8 acpi_tb_checksum(u8 * buffer, acpi_native_uint length)
 183 {
 184         u8 sum = 0;
 185         u8 *end = buffer + length;
 186
 187         while (buffer < end) {
 188                 sum = (u8) (sum + *(buffer++));
 189         }
 190
 191         return sum;
 192 }
 193
 194 /*******************************************************************************
 195  *
 196  * FUNCTION:    acpi_tb_install_table
 197  *
 198  * PARAMETERS:  Address                 - Physical address of DSDT or FACS
 199  *              Flags                   - Flags
 200  *              Signature               - Table signature, NULL if no need to
 201  *                                        match
 202  *              table_index             - Index into root table array
 203  *
 204  * RETURN:      None
 205  *
 206  * DESCRIPTION: Install an ACPI table into the global data structure.
 207  *
 208  ******************************************************************************/
 209
 210 void
 211 acpi_tb_install_table(acpi_physical_address address,
 212                       u8 flags, char *signature, acpi_native_uint table_index)
 213 {
 214         struct acpi_table_header *table;
 215
 216         if (!address) {
 217                 ACPI_ERROR((AE_INFO,
 218                             "Null physical address for ACPI table [%s]",
 219                             signature));
 220                 return;
 221         }
 222
 223         /* Map just the table header */
 224
 225         table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
 226         if (!table) {
 227                 return;
 228         }
 229
 230         /* If a particular signature is expected, signature must match */
 231
 232         if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
 233                 ACPI_ERROR((AE_INFO,
 234                             "Invalid signature 0x%X for ACPI table [%s]",
 235                             *ACPI_CAST_PTR(u32, table->signature), signature));
 236                 goto unmap_and_exit;
 237         }
 238
 239         /* Initialize the table entry */
 240
 241         acpi_gbl_root_table_list.tables[table_index].address = address;
 242         acpi_gbl_root_table_list.tables[table_index].length = table->length;
 243         acpi_gbl_root_table_list.tables[table_index].flags = flags;
 244
 245         ACPI_MOVE_32_TO_32(&
 246                            (acpi_gbl_root_table_list.tables[table_index].
 247                             signature), table->signature);
 248
 249         acpi_tb_print_table_header(address, table);
 250
 251         if (table_index == ACPI_TABLE_INDEX_DSDT) {
 252
 253                 /* Global integer width is based upon revision of the DSDT */
 254
 255                 acpi_ut_set_integer_width(table->revision);
 256         }
 257
 258       unmap_and_exit:
 259         acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
 260 }
 261
 262 /*******************************************************************************
 263  *
 264  * FUNCTION:    acpi_tb_get_root_table_entry
 265  *
 266  * PARAMETERS:  table_entry         - Pointer to the RSDT/XSDT table entry
 267  *              table_entry_size    - sizeof 32 or 64 (RSDT or XSDT)
 268  *
 269  * RETURN:      Physical address extracted from the root table
 270  *
 271  * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
 272  *              both 32-bit and 64-bit platforms
 273  *
 274  * NOTE:        acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
 275  *              64-bit platforms.
 276  *
 277  ******************************************************************************/
 278
 279 static acpi_physical_address
 280 acpi_tb_get_root_table_entry(u8 * table_entry,
 281                              acpi_native_uint table_entry_size)
 282 {
 283         u64 address64;
 284
 285         /*
 286          * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
 287          * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
 288          */
 289         if (table_entry_size == sizeof(u32)) {
 290                 /*
 291                  * 32-bit platform, RSDT: Return 32-bit table entry
 292                  * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
 293                  */
 294                 return ((acpi_physical_address)
 295                         (*ACPI_CAST_PTR(u32, table_entry)));
 296         } else {
 297                 /*
 298                  * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
 299                  * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, return 64-bit
 300                  */
 301                 ACPI_MOVE_64_TO_64(&address64, table_entry);
 302
 303 #if ACPI_MACHINE_WIDTH == 32
 304                 if (address64 > ACPI_UINT32_MAX) {
 305
 306                         /* Will truncate 64-bit address to 32 bits, issue warning */
 307
 308                         ACPI_WARNING((AE_INFO,
 309                                       "64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating",
 310                                       ACPI_FORMAT_UINT64(address64)));
 311                 }
 312 #endif
 313                 return ((acpi_physical_address) (address64));
 314         }
 315 }
 316
 317 /*******************************************************************************
 318  *
 319  * FUNCTION:    acpi_tb_parse_root_table
 320  *
 321  * PARAMETERS:  Rsdp                    - Pointer to the RSDP
 322  *              Flags                   - Flags
 323  *
 324  * RETURN:      Status
 325  *
 326  * DESCRIPTION: This function is called to parse the Root System Description
 327  *              Table (RSDT or XSDT)
 328  *
 329  * NOTE:        Tables are mapped (not copied) for efficiency. The FACS must
 330  *              be mapped and cannot be copied because it contains the actual
 331  *              memory location of the ACPI Global Lock.
 332  *
 333  ******************************************************************************/
 334
 335 acpi_status __init
 336 acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
 337 {
 338         struct acpi_table_rsdp *rsdp;
 339         acpi_native_uint table_entry_size;
 340         acpi_native_uint i;
 341         u32 table_count;
 342         struct acpi_table_header *table;
 343         acpi_physical_address address;
 344         u32 length;
 345         u8 *table_entry;
 346         acpi_status status;
 347
 348         ACPI_FUNCTION_TRACE(tb_parse_root_table);
 349
 350         /*
 351          * Map the entire RSDP and extract the address of the RSDT or XSDT
 352          */
 353         rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
 354         if (!rsdp) {
 355                 return_ACPI_STATUS(AE_NO_MEMORY);
 356         }
 357
 358         acpi_tb_print_table_header(rsdp_address,
 359                                    ACPI_CAST_PTR(struct acpi_table_header,
 360                                                  rsdp));
 361
 362         /* Differentiate between RSDT and XSDT root tables */
 363
 364         if (rsdp->revision > 1 && rsdp->xsdt_physical_address) {
 365                 /*
 366                  * Root table is an XSDT (64-bit physical addresses). We must use the
 367                  * XSDT if the revision is > 1 and the XSDT pointer is present, as per
 368                  * the ACPI specification.
 369                  */
 370                 address = (acpi_physical_address) rsdp->xsdt_physical_address;
 371                 table_entry_size = sizeof(u64);
 372         } else {
 373                 /* Root table is an RSDT (32-bit physical addresses) */
 374
 375                 address = (acpi_physical_address) rsdp->rsdt_physical_address;
 376                 table_entry_size = sizeof(u32);
 377         }
 378
 379         /*
 380          * It is not possible to map more than one entry in some environments,
 381          * so unmap the RSDP here before mapping other tables
 382          */
 383         acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
 384
 385         /* Map the RSDT/XSDT table header to get the full table length */
 386
 387         table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
 388         if (!table) {
 389                 return_ACPI_STATUS(AE_NO_MEMORY);
 390         }
 391
 392         acpi_tb_print_table_header(address, table);
 393
 394         /* Get the length of the full table, verify length and map entire table */
 395
 396         length = table->length;
 397         acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
 398
 399         if (length < sizeof(struct acpi_table_header)) {
 400                 ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
 401                             length));
 402                 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 403         }
 404
 405         table = acpi_os_map_memory(address, length);
 406         if (!table) {
 407                 return_ACPI_STATUS(AE_NO_MEMORY);
 408         }
 409
 410         /* Validate the root table checksum */
 411
 412         status = acpi_tb_verify_checksum(table, length);
 413         if (ACPI_FAILURE(status)) {
 414                 acpi_os_unmap_memory(table, length);
 415                 return_ACPI_STATUS(status);
 416         }
 417
 418         /* Calculate the number of tables described in the root table */
 419
 420         table_count =
 421             (u32) ((table->length -
 422                     sizeof(struct acpi_table_header)) / table_entry_size);
 423
 424         /*
 425          * First two entries in the table array are reserved for the DSDT and FACS,
 426          * which are not actually present in the RSDT/XSDT - they come from the FADT
 427          */
 428         table_entry =
 429             ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
 430         acpi_gbl_root_table_list.count = 2;
 431
 432         /*
 433          * Initialize the root table array from the RSDT/XSDT
 434          */
 435         for (i = 0; i < table_count; i++) {
 436                 if (acpi_gbl_root_table_list.count >=
 437                     acpi_gbl_root_table_list.size) {
 438
 439                         /* There is no more room in the root table array, attempt resize */
 440
 441                         status = acpi_tb_resize_root_table_list();
 442                         if (ACPI_FAILURE(status)) {
 443                                 ACPI_WARNING((AE_INFO,
 444                                               "Truncating %u table entries!",
 445                                               (unsigned)
 446                                               (acpi_gbl_root_table_list.size -
 447                                                acpi_gbl_root_table_list.
 448                                                count)));
 449                                 break;
 450                         }
 451                 }
 452
 453                 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
 454
 455                 acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
 456                     address =
 457                     acpi_tb_get_root_table_entry(table_entry, table_entry_size);
 458
 459                 table_entry += table_entry_size;
 460                 acpi_gbl_root_table_list.count++;
 461         }
 462
 463         /*
 464          * It is not possible to map more than one entry in some environments,
 465          * so unmap the root table here before mapping other tables
 466          */
 467         acpi_os_unmap_memory(table, length);
 468
 469         /*
 470          * Complete the initialization of the root table array by examining
 471          * the header of each table
 472          */
 473         for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
 474                 acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
 475                                       address, flags, NULL, i);
 476
 477                 /* Special case for FADT - get the DSDT and FACS */
 478
 479                 if (ACPI_COMPARE_NAME
 480                     (&acpi_gbl_root_table_list.tables[i].signature,
 481                      ACPI_SIG_FADT)) {
 482                         acpi_tb_parse_fadt(i, flags);
 483                 }
 484         }
 485
 486         return_ACPI_STATUS(AE_OK);
 487 }