drivers/acpi/tables/tbconvrt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbconvrt - ACPI Table conversion utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, 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 <linux/module.h>
  45
  46 #include <acpi/acpi.h>
  47 #include <acpi/actables.h>
  48
  49
  50 #define _COMPONENT          ACPI_TABLES
  51          ACPI_MODULE_NAME    ("tbconvrt")
  52
  53 /* Local prototypes */
  54
  55 static void
  56 acpi_tb_init_generic_address (
  57         struct acpi_generic_address     *new_gas_struct,
  58         u8                              register_bit_width,
  59         acpi_physical_address           address);
  60
  61 static void
  62 acpi_tb_convert_fadt1 (
  63         struct fadt_descriptor_rev2    *local_fadt,
  64         struct fadt_descriptor_rev1    *original_fadt);
  65
  66 static void
  67 acpi_tb_convert_fadt2 (
  68         struct fadt_descriptor_rev2    *local_fadt,
  69         struct fadt_descriptor_rev2    *original_fadt);
  70
  71
  72 u8 acpi_fadt_is_v1;
  73 EXPORT_SYMBOL(acpi_fadt_is_v1);
  74
  75 /*******************************************************************************
  76  *
  77  * FUNCTION:    acpi_tb_get_table_count
  78  *
  79  * PARAMETERS:  RSDP            - Pointer to the RSDP
  80  *              RSDT            - Pointer to the RSDT/XSDT
  81  *
  82  * RETURN:      The number of tables pointed to by the RSDT or XSDT.
  83  *
  84  * DESCRIPTION: Calculate the number of tables.  Automatically handles either
  85  *              an RSDT or XSDT.
  86  *
  87  ******************************************************************************/
  88
  89 u32
  90 acpi_tb_get_table_count (
  91         struct rsdp_descriptor          *RSDP,
  92         struct acpi_table_header        *RSDT)
  93 {
  94         u32                             pointer_size;
  95
  96
  97         ACPI_FUNCTION_ENTRY ();
  98
  99
 100         if (RSDP->revision < 2) {
 101                 pointer_size = sizeof (u32);
 102         }
 103         else {
 104                 pointer_size = sizeof (u64);
 105         }
 106
 107         /*
 108          * Determine the number of tables pointed to by the RSDT/XSDT.
 109          * This is defined by the ACPI Specification to be the number of
 110          * pointers contained within the RSDT/XSDT.  The size of the pointers
 111          * is architecture-dependent.
 112          */
 113         return ((RSDT->length - sizeof (struct acpi_table_header)) / pointer_size);
 114 }
 115
 116
 117 /*******************************************************************************
 118  *
 119  * FUNCTION:    acpi_tb_convert_to_xsdt
 120  *
 121  * PARAMETERS:  table_info      - Info about the RSDT
 122  *
 123  * RETURN:      Status
 124  *
 125  * DESCRIPTION: Convert an RSDT to an XSDT (internal common format)
 126  *
 127  ******************************************************************************/
 128
 129 acpi_status
 130 acpi_tb_convert_to_xsdt (
 131         struct acpi_table_desc          *table_info)
 132 {
 133         acpi_size                       table_size;
 134         u32                             i;
 135         XSDT_DESCRIPTOR         *new_table;
 136
 137
 138         ACPI_FUNCTION_ENTRY ();
 139
 140
 141         /* Compute size of the converted XSDT */
 142
 143         table_size = ((acpi_size) acpi_gbl_rsdt_table_count * sizeof (u64)) +
 144                           sizeof (struct acpi_table_header);
 145
 146         /* Allocate an XSDT */
 147
 148         new_table = ACPI_MEM_CALLOCATE (table_size);
 149         if (!new_table) {
 150                 return (AE_NO_MEMORY);
 151         }
 152
 153         /* Copy the header and set the length */
 154
 155         ACPI_MEMCPY (new_table, table_info->pointer, sizeof (struct acpi_table_header));
 156         new_table->length = (u32) table_size;
 157
 158         /* Copy the table pointers */
 159
 160         for (i = 0; i < acpi_gbl_rsdt_table_count; i++) {
 161                 if (acpi_gbl_RSDP->revision < 2) {
 162                         ACPI_STORE_ADDRESS (new_table->table_offset_entry[i],
 163                                 (ACPI_CAST_PTR (struct rsdt_descriptor_rev1,
 164                                         table_info->pointer))->table_offset_entry[i]);
 165                 }
 166                 else {
 167                         new_table->table_offset_entry[i] =
 168                                 (ACPI_CAST_PTR (XSDT_DESCRIPTOR,
 169                                         table_info->pointer))->table_offset_entry[i];
 170                 }
 171         }
 172
 173         /* Delete the original table (either mapped or in a buffer) */
 174
 175         acpi_tb_delete_single_table (table_info);
 176
 177         /* Point the table descriptor to the new table */
 178
 179         table_info->pointer     = ACPI_CAST_PTR (struct acpi_table_header, new_table);
 180         table_info->length      = table_size;
 181         table_info->allocation  = ACPI_MEM_ALLOCATED;
 182
 183         return (AE_OK);
 184 }
 185
 186
 187 /*******************************************************************************
 188  *
 189  * FUNCTION:    acpi_tb_init_generic_address
 190  *
 191  * PARAMETERS:  new_gas_struct      - GAS struct to be initialized
 192  *              register_bit_width  - Width of this register
 193  *              Address             - Address of the register
 194  *
 195  * RETURN:      None
 196  *
 197  * DESCRIPTION: Initialize a GAS structure.
 198  *
 199  ******************************************************************************/
 200
 201 static void
 202 acpi_tb_init_generic_address (
 203         struct acpi_generic_address     *new_gas_struct,
 204         u8                              register_bit_width,
 205         acpi_physical_address           address)
 206 {
 207
 208         ACPI_STORE_ADDRESS (new_gas_struct->address, address);
 209
 210         new_gas_struct->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
 211         new_gas_struct->register_bit_width = register_bit_width;
 212         new_gas_struct->register_bit_offset = 0;
 213         new_gas_struct->access_width    = 0;
 214 }
 215
 216
 217 /*******************************************************************************
 218  *
 219  * FUNCTION:    acpi_tb_convert_fadt1
 220  *
 221  * PARAMETERS:  local_fadt      - Pointer to new FADT
 222  *              original_fadt   - Pointer to old FADT
 223  *
 224  * RETURN:      None, populates local_fadt
 225  *
 226  * DESCRIPTION: Convert an ACPI 1.0 FADT to common internal format
 227  *
 228  ******************************************************************************/
 229
 230 static void
 231 acpi_tb_convert_fadt1 (
 232         struct fadt_descriptor_rev2    *local_fadt,
 233         struct fadt_descriptor_rev1    *original_fadt)
 234 {
 235
 236         /* ACPI 1.0 FACS */
 237         /* The BIOS stored FADT should agree with Revision 1.0 */
 238         acpi_fadt_is_v1 = 1;
 239
 240         /*
 241          * Copy the table header and the common part of the tables.
 242          *
 243          * The 2.0 table is an extension of the 1.0 table, so the entire 1.0
 244          * table can be copied first, then expand some fields to 64 bits.
 245          */
 246         ACPI_MEMCPY (local_fadt, original_fadt, sizeof (struct fadt_descriptor_rev1));
 247
 248         /* Convert table pointers to 64-bit fields */
 249
 250         ACPI_STORE_ADDRESS (local_fadt->xfirmware_ctrl, local_fadt->V1_firmware_ctrl);
 251         ACPI_STORE_ADDRESS (local_fadt->Xdsdt, local_fadt->V1_dsdt);
 252
 253         /*
 254          * System Interrupt Model isn't used in ACPI 2.0
 255          * (local_fadt->Reserved1 = 0;)
 256          */
 257
 258         /*
 259          * This field is set by the OEM to convey the preferred power management
 260          * profile to OSPM. It doesn't have any 1.0 equivalence.  Since we don't
 261          * know what kind of 32-bit system this is, we will use "unspecified".
 262          */
 263         local_fadt->prefer_PM_profile = PM_UNSPECIFIED;
 264
 265         /*
 266          * Processor Performance State Control. This is the value OSPM writes to
 267          * the SMI_CMD register to assume processor performance state control
 268          * responsibility. There isn't any equivalence in 1.0, but as many 1.x
 269          * ACPI tables contain _PCT and _PSS we also keep this value, unless
 270          * acpi_strict is set.
 271          */
 272         if (acpi_strict)
 273                 local_fadt->pstate_cnt = 0;
 274
 275         /*
 276          * Support for the _CST object and C States change notification.
 277          * This data item hasn't any 1.0 equivalence so leave it zero.
 278          */
 279         local_fadt->cst_cnt = 0;
 280
 281         /*
 282          * FADT Rev 2 was an interim FADT released between ACPI 1.0 and ACPI 2.0.
 283          * It primarily adds the FADT reset mechanism.
 284          */
 285         if ((original_fadt->revision == 2) &&
 286                 (original_fadt->length == sizeof (struct fadt_descriptor_rev2_minus))) {
 287                 /*
 288                  * Grab the entire generic address struct, plus the 1-byte reset value
 289                  * that immediately follows.
 290                  */
 291                 ACPI_MEMCPY (&local_fadt->reset_register,
 292                         &(ACPI_CAST_PTR (struct fadt_descriptor_rev2_minus,
 293                                 original_fadt))->reset_register,
 294                         sizeof (struct acpi_generic_address) + 1);
 295         }
 296         else {
 297                 /*
 298                  * Since there isn't any equivalence in 1.0 and since it is highly
 299                  * likely that a 1.0 system has legacy support.
 300                  */
 301                 local_fadt->iapc_boot_arch = BAF_LEGACY_DEVICES;
 302         }
 303
 304         /*
 305          * Convert the V1.0 block addresses to V2.0 GAS structures
 306          */
 307         acpi_tb_init_generic_address (&local_fadt->xpm1a_evt_blk, local_fadt->pm1_evt_len,
 308                           (acpi_physical_address)   local_fadt->V1_pm1a_evt_blk);
 309         acpi_tb_init_generic_address (&local_fadt->xpm1b_evt_blk, local_fadt->pm1_evt_len,
 310                           (acpi_physical_address)   local_fadt->V1_pm1b_evt_blk);
 311         acpi_tb_init_generic_address (&local_fadt->xpm1a_cnt_blk, local_fadt->pm1_cnt_len,
 312                           (acpi_physical_address)   local_fadt->V1_pm1a_cnt_blk);
 313         acpi_tb_init_generic_address (&local_fadt->xpm1b_cnt_blk, local_fadt->pm1_cnt_len,
 314                           (acpi_physical_address)   local_fadt->V1_pm1b_cnt_blk);
 315         acpi_tb_init_generic_address (&local_fadt->xpm2_cnt_blk, local_fadt->pm2_cnt_len,
 316                           (acpi_physical_address)   local_fadt->V1_pm2_cnt_blk);
 317         acpi_tb_init_generic_address (&local_fadt->xpm_tmr_blk, local_fadt->pm_tm_len,
 318                           (acpi_physical_address)   local_fadt->V1_pm_tmr_blk);
 319         acpi_tb_init_generic_address (&local_fadt->xgpe0_blk, 0,
 320                           (acpi_physical_address)   local_fadt->V1_gpe0_blk);
 321         acpi_tb_init_generic_address (&local_fadt->xgpe1_blk, 0,
 322                           (acpi_physical_address)   local_fadt->V1_gpe1_blk);
 323
 324         /* Create separate GAS structs for the PM1 Enable registers */
 325
 326         acpi_tb_init_generic_address (&acpi_gbl_xpm1a_enable,
 327                  (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
 328                  (acpi_physical_address)
 329                         (local_fadt->xpm1a_evt_blk.address +
 330                         ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
 331
 332         /* PM1B is optional; leave null if not present */
 333
 334         if (local_fadt->xpm1b_evt_blk.address) {
 335                 acpi_tb_init_generic_address (&acpi_gbl_xpm1b_enable,
 336                          (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
 337                          (acpi_physical_address)
 338                                 (local_fadt->xpm1b_evt_blk.address +
 339                                 ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
 340         }
 341 }
 342
 343
 344 /*******************************************************************************
 345  *
 346  * FUNCTION:    acpi_tb_convert_fadt2
 347  *
 348  * PARAMETERS:  local_fadt      - Pointer to new FADT
 349  *              original_fadt   - Pointer to old FADT
 350  *
 351  * RETURN:      None, populates local_fadt
 352  *
 353  * DESCRIPTION: Convert an ACPI 2.0 FADT to common internal format.
 354  *              Handles optional "X" fields.
 355  *
 356  ******************************************************************************/
 357
 358 static void
 359 acpi_tb_convert_fadt2 (
 360         struct fadt_descriptor_rev2    *local_fadt,
 361         struct fadt_descriptor_rev2    *original_fadt)
 362 {
 363
 364         /* We have an ACPI 2.0 FADT but we must copy it to our local buffer */
 365
 366         ACPI_MEMCPY (local_fadt, original_fadt, sizeof (struct fadt_descriptor_rev2));
 367
 368         /*
 369          * "X" fields are optional extensions to the original V1.0 fields, so
 370          * we must selectively expand V1.0 fields if the corresponding X field
 371          * is zero.
 372          */
 373         if (!(local_fadt->xfirmware_ctrl)) {
 374                 ACPI_STORE_ADDRESS (local_fadt->xfirmware_ctrl,
 375                         local_fadt->V1_firmware_ctrl);
 376         }
 377
 378         if (!(local_fadt->Xdsdt)) {
 379                 ACPI_STORE_ADDRESS (local_fadt->Xdsdt, local_fadt->V1_dsdt);
 380         }
 381
 382         if (!(local_fadt->xpm1a_evt_blk.address)) {
 383                 acpi_tb_init_generic_address (&local_fadt->xpm1a_evt_blk,
 384                         local_fadt->pm1_evt_len,
 385                         (acpi_physical_address) local_fadt->V1_pm1a_evt_blk);
 386         }
 387
 388         if (!(local_fadt->xpm1b_evt_blk.address)) {
 389                 acpi_tb_init_generic_address (&local_fadt->xpm1b_evt_blk,
 390                         local_fadt->pm1_evt_len,
 391                         (acpi_physical_address) local_fadt->V1_pm1b_evt_blk);
 392         }
 393
 394         if (!(local_fadt->xpm1a_cnt_blk.address)) {
 395                 acpi_tb_init_generic_address (&local_fadt->xpm1a_cnt_blk,
 396                         local_fadt->pm1_cnt_len,
 397                         (acpi_physical_address) local_fadt->V1_pm1a_cnt_blk);
 398         }
 399
 400         if (!(local_fadt->xpm1b_cnt_blk.address)) {
 401                 acpi_tb_init_generic_address (&local_fadt->xpm1b_cnt_blk,
 402                         local_fadt->pm1_cnt_len,
 403                         (acpi_physical_address) local_fadt->V1_pm1b_cnt_blk);
 404         }
 405
 406         if (!(local_fadt->xpm2_cnt_blk.address)) {
 407                 acpi_tb_init_generic_address (&local_fadt->xpm2_cnt_blk,
 408                         local_fadt->pm2_cnt_len,
 409                         (acpi_physical_address) local_fadt->V1_pm2_cnt_blk);
 410         }
 411
 412         if (!(local_fadt->xpm_tmr_blk.address)) {
 413                 acpi_tb_init_generic_address (&local_fadt->xpm_tmr_blk,
 414                         local_fadt->pm_tm_len,
 415                         (acpi_physical_address) local_fadt->V1_pm_tmr_blk);
 416         }
 417
 418         if (!(local_fadt->xgpe0_blk.address)) {
 419                 acpi_tb_init_generic_address (&local_fadt->xgpe0_blk,
 420                         0, (acpi_physical_address) local_fadt->V1_gpe0_blk);
 421         }
 422
 423         if (!(local_fadt->xgpe1_blk.address)) {
 424                 acpi_tb_init_generic_address (&local_fadt->xgpe1_blk,
 425                         0, (acpi_physical_address) local_fadt->V1_gpe1_blk);
 426         }
 427
 428         /* Create separate GAS structs for the PM1 Enable registers */
 429
 430         acpi_tb_init_generic_address (&acpi_gbl_xpm1a_enable,
 431                 (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
 432                 (acpi_physical_address)
 433                         (local_fadt->xpm1a_evt_blk.address +
 434                         ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
 435
 436         acpi_gbl_xpm1a_enable.address_space_id =
 437                 local_fadt->xpm1a_evt_blk.address_space_id;
 438
 439         /* PM1B is optional; leave null if not present */
 440
 441         if (local_fadt->xpm1b_evt_blk.address) {
 442                 acpi_tb_init_generic_address (&acpi_gbl_xpm1b_enable,
 443                         (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
 444                         (acpi_physical_address)
 445                                 (local_fadt->xpm1b_evt_blk.address +
 446                                 ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
 447
 448                 acpi_gbl_xpm1b_enable.address_space_id =
 449                         local_fadt->xpm1b_evt_blk.address_space_id;
 450         }
 451 }
 452
 453
 454 /*******************************************************************************
 455  *
 456  * FUNCTION:    acpi_tb_convert_table_fadt
 457  *
 458  * PARAMETERS:  None
 459  *
 460  * RETURN:      Status
 461  *
 462  * DESCRIPTION: Converts a BIOS supplied ACPI 1.0 FADT to a local
 463  *              ACPI 2.0 FADT. If the BIOS supplied a 2.0 FADT then it is simply
 464  *              copied to the local FADT.  The ACPI CA software uses this
 465  *              local FADT. Thus a significant amount of special #ifdef
 466  *              type codeing is saved.
 467  *
 468  ******************************************************************************/
 469
 470 acpi_status
 471 acpi_tb_convert_table_fadt (
 472         void)
 473 {
 474         struct fadt_descriptor_rev2    *local_fadt;
 475         struct acpi_table_desc         *table_desc;
 476
 477
 478         ACPI_FUNCTION_TRACE ("tb_convert_table_fadt");
 479
 480
 481         /*
 482          * acpi_gbl_FADT is valid. Validate the FADT length. The table must be
 483          * at least as long as the version 1.0 FADT
 484          */
 485         if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev1)) {
 486                 ACPI_REPORT_ERROR (("FADT is invalid, too short: 0x%X\n",
 487                         acpi_gbl_FADT->length));
 488                 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
 489         }
 490
 491         /* Allocate buffer for the ACPI 2.0(+) FADT */
 492
 493         local_fadt = ACPI_MEM_CALLOCATE (sizeof (struct fadt_descriptor_rev2));
 494         if (!local_fadt) {
 495                 return_ACPI_STATUS (AE_NO_MEMORY);
 496         }
 497
 498         if (acpi_gbl_FADT->revision >= FADT2_REVISION_ID) {
 499                 if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev2)) {
 500                         /* Length is too short to be a V2.0 table */
 501
 502                         ACPI_REPORT_WARNING ((
 503                                 "Inconsistent FADT length (0x%X) and revision (0x%X), using FADT V1.0 portion of table\n",
 504                                 acpi_gbl_FADT->length, acpi_gbl_FADT->revision));
 505
 506                         acpi_tb_convert_fadt1 (local_fadt, (void *) acpi_gbl_FADT);
 507                 }
 508                 else {
 509                         /* Valid V2.0 table */
 510
 511                         acpi_tb_convert_fadt2 (local_fadt, acpi_gbl_FADT);
 512                 }
 513         }
 514         else {
 515                 /* Valid V1.0 table */
 516
 517                 acpi_tb_convert_fadt1 (local_fadt, (void *) acpi_gbl_FADT);
 518         }
 519
 520         /* Global FADT pointer will point to the new common V2.0 FADT */
 521
 522         acpi_gbl_FADT = local_fadt;
 523         acpi_gbl_FADT->length = sizeof (FADT_DESCRIPTOR);
 524
 525         /* Free the original table */
 526
 527         table_desc = acpi_gbl_table_lists[ACPI_TABLE_FADT].next;
 528         acpi_tb_delete_single_table (table_desc);
 529
 530         /* Install the new table */
 531
 532         table_desc->pointer     = ACPI_CAST_PTR (struct acpi_table_header, acpi_gbl_FADT);
 533         table_desc->allocation  = ACPI_MEM_ALLOCATED;
 534         table_desc->length      = sizeof (struct fadt_descriptor_rev2);
 535
 536         /* Dump the entire FADT */
 537
 538         ACPI_DEBUG_PRINT ((ACPI_DB_TABLES,
 539                 "Hex dump of common internal FADT, size %d (%X)\n",
 540                 acpi_gbl_FADT->length, acpi_gbl_FADT->length));
 541         ACPI_DUMP_BUFFER ((u8 *) (acpi_gbl_FADT), acpi_gbl_FADT->length);
 542
 543         return_ACPI_STATUS (AE_OK);
 544 }
 545
 546
 547 /*******************************************************************************
 548  *
 549  * FUNCTION:    acpi_tb_build_common_facs
 550  *
 551  * PARAMETERS:  table_info      - Info for currently installed FACS
 552  *
 553  * RETURN:      Status
 554  *
 555  * DESCRIPTION: Convert ACPI 1.0 and ACPI 2.0 FACS to a common internal
 556  *              table format.
 557  *
 558  ******************************************************************************/
 559
 560 acpi_status
 561 acpi_tb_build_common_facs (
 562         struct acpi_table_desc          *table_info)
 563 {
 564
 565         ACPI_FUNCTION_TRACE ("tb_build_common_facs");
 566
 567
 568         /* Absolute minimum length is 24, but the ACPI spec says 64 */
 569
 570         if (acpi_gbl_FACS->length < 24) {
 571                 ACPI_REPORT_ERROR (("Invalid FACS table length: 0x%X\n",
 572                         acpi_gbl_FACS->length));
 573                 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
 574         }
 575
 576         if (acpi_gbl_FACS->length < 64) {
 577                 ACPI_REPORT_WARNING ((
 578                         "FACS is shorter than the ACPI specification allows: 0x%X, using anyway\n",
 579                         acpi_gbl_FACS->length));
 580         }
 581
 582         /* Copy fields to the new FACS */
 583
 584         acpi_gbl_common_fACS.global_lock = &(acpi_gbl_FACS->global_lock);
 585
 586         if ((acpi_gbl_RSDP->revision < 2) ||
 587                 (acpi_gbl_FACS->length < 32) ||
 588                 (!(acpi_gbl_FACS->xfirmware_waking_vector))) {
 589                 /* ACPI 1.0 FACS or short table or optional X_ field is zero */
 590
 591                 acpi_gbl_common_fACS.firmware_waking_vector = ACPI_CAST_PTR (u64,
 592                                 &(acpi_gbl_FACS->firmware_waking_vector));
 593                 acpi_gbl_common_fACS.vector_width = 32;
 594         }
 595         else {
 596                 /* ACPI 2.0 FACS with valid X_ field */
 597
 598                 acpi_gbl_common_fACS.firmware_waking_vector = &acpi_gbl_FACS->xfirmware_waking_vector;
 599                 acpi_gbl_common_fACS.vector_width = 64;
 600         }
 601
 602         return_ACPI_STATUS (AE_OK);
 603 }
 604
 605