git.oblomov.eu Git - linux-2.6/blob - 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
  54 u8 acpi_fadt_is_v1;
  55 EXPORT_SYMBOL(acpi_fadt_is_v1);
  56
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    acpi_tb_get_table_count
  60  *
  61  * PARAMETERS:  RSDP            - Pointer to the RSDP
  62  *              RSDT            - Pointer to the RSDT/XSDT
  63  *
  64  * RETURN:      The number of tables pointed to by the RSDT or XSDT.
  65  *
  66  * DESCRIPTION: Calculate the number of tables.  Automatically handles either
  67  *              an RSDT or XSDT.
  68  *
  69  ******************************************************************************/
  70
  71 u32
  72 acpi_tb_get_table_count (
  73         struct rsdp_descriptor          *RSDP,
  74         struct acpi_table_header        *RSDT)
  75 {
  76         u32                             pointer_size;
  77
  78
  79         ACPI_FUNCTION_ENTRY ();
  80
  81
  82         if (RSDP->revision < 2) {
  83                 pointer_size = sizeof (u32);
  84         }
  85         else {
  86                 pointer_size = sizeof (u64);
  87         }
  88
  89         /*
  90          * Determine the number of tables pointed to by the RSDT/XSDT.
  91          * This is defined by the ACPI Specification to be the number of
  92          * pointers contained within the RSDT/XSDT.  The size of the pointers
  93          * is architecture-dependent.
  94          */
  95         return ((RSDT->length - sizeof (struct acpi_table_header)) / pointer_size);
  96 }
  97
  98
  99 /*******************************************************************************
 100  *
 101  * FUNCTION:    acpi_tb_convert_to_xsdt
 102  *
 103  * PARAMETERS:  table_info      - Info about the RSDT
 104  *
 105  * RETURN:      Status
 106  *
 107  * DESCRIPTION: Convert an RSDT to an XSDT (internal common format)
 108  *
 109  ******************************************************************************/
 110
 111 acpi_status
 112 acpi_tb_convert_to_xsdt (
 113         struct acpi_table_desc          *table_info)
 114 {
 115         acpi_size                       table_size;
 116         u32                             i;
 117         XSDT_DESCRIPTOR         *new_table;
 118
 119
 120         ACPI_FUNCTION_ENTRY ();
 121
 122
 123         /* Compute size of the converted XSDT */
 124
 125         table_size = ((acpi_size) acpi_gbl_rsdt_table_count * sizeof (u64)) +
 126                           sizeof (struct acpi_table_header);
 127
 128         /* Allocate an XSDT */
 129
 130         new_table = ACPI_MEM_CALLOCATE (table_size);
 131         if (!new_table) {
 132                 return (AE_NO_MEMORY);
 133         }
 134
 135         /* Copy the header and set the length */
 136
 137         ACPI_MEMCPY (new_table, table_info->pointer, sizeof (struct acpi_table_header));
 138         new_table->length = (u32) table_size;
 139
 140         /* Copy the table pointers */
 141
 142         for (i = 0; i < acpi_gbl_rsdt_table_count; i++) {
 143                 if (acpi_gbl_RSDP->revision < 2) {
 144                         ACPI_STORE_ADDRESS (new_table->table_offset_entry[i],
 145                                 (ACPI_CAST_PTR (struct rsdt_descriptor_rev1, table_info->pointer))->table_offset_entry[i]);
 146                 }
 147                 else {
 148                         new_table->table_offset_entry[i] =
 149                                 (ACPI_CAST_PTR (XSDT_DESCRIPTOR, table_info->pointer))->table_offset_entry[i];
 150                 }
 151         }
 152
 153         /* Delete the original table (either mapped or in a buffer) */
 154
 155         acpi_tb_delete_single_table (table_info);
 156
 157         /* Point the table descriptor to the new table */
 158
 159         table_info->pointer     = ACPI_CAST_PTR (struct acpi_table_header, new_table);
 160         table_info->length      = table_size;
 161         table_info->allocation  = ACPI_MEM_ALLOCATED;
 162
 163         return (AE_OK);
 164 }
 165
 166
 167 /******************************************************************************
 168  *
 169  * FUNCTION:    acpi_tb_init_generic_address
 170  *
 171  * PARAMETERS:  new_gas_struct      - GAS struct to be initialized
 172  *              register_bit_width  - Width of this register
 173  *              Address             - Address of the register
 174  *
 175  * RETURN:      None
 176  *
 177  * DESCRIPTION: Initialize a GAS structure.
 178  *
 179  ******************************************************************************/
 180
 181 static void
 182 acpi_tb_init_generic_address (
 183         struct acpi_generic_address     *new_gas_struct,
 184         u8                              register_bit_width,
 185         acpi_physical_address           address)
 186 {
 187
 188         ACPI_STORE_ADDRESS (new_gas_struct->address, address);
 189
 190         new_gas_struct->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
 191         new_gas_struct->register_bit_width = register_bit_width;
 192         new_gas_struct->register_bit_offset = 0;
 193         new_gas_struct->access_width    = 0;
 194 }
 195
 196
 197 /*******************************************************************************
 198  *
 199  * FUNCTION:    acpi_tb_convert_fadt1
 200  *
 201  * PARAMETERS:  local_fadt      - Pointer to new FADT
 202  *              original_fadt   - Pointer to old FADT
 203  *
 204  * RETURN:      Populates local_fadt
 205  *
 206  * DESCRIPTION: Convert an ACPI 1.0 FADT to common internal format
 207  *
 208  ******************************************************************************/
 209
 210 static void
 211 acpi_tb_convert_fadt1 (
 212         struct fadt_descriptor_rev2    *local_fadt,
 213         struct fadt_descriptor_rev1    *original_fadt)
 214 {
 215
 216
 217         /* ACPI 1.0 FACS */
 218         /* The BIOS stored FADT should agree with Revision 1.0 */
 219         acpi_fadt_is_v1 = 1;
 220
 221         /*
 222          * Copy the table header and the common part of the tables.
 223          *
 224          * The 2.0 table is an extension of the 1.0 table, so the entire 1.0
 225          * table can be copied first, then expand some fields to 64 bits.
 226          */
 227         ACPI_MEMCPY (local_fadt, original_fadt, sizeof (struct fadt_descriptor_rev1));
 228
 229         /* Convert table pointers to 64-bit fields */
 230
 231         ACPI_STORE_ADDRESS (local_fadt->xfirmware_ctrl, local_fadt->V1_firmware_ctrl);
 232         ACPI_STORE_ADDRESS (local_fadt->Xdsdt, local_fadt->V1_dsdt);
 233
 234         /*
 235          * System Interrupt Model isn't used in ACPI 2.0 (local_fadt->Reserved1 = 0;)
 236          */
 237
 238         /*
 239          * This field is set by the OEM to convey the preferred power management
 240          * profile to OSPM. It doesn't have any 1.0 equivalence.  Since we don't
 241          * know what kind of 32-bit system this is, we will use "unspecified".
 242          */
 243         local_fadt->prefer_PM_profile = PM_UNSPECIFIED;
 244
 245         /*
 246          * Processor Performance State Control. This is the value OSPM writes to
 247          * the SMI_CMD register to assume processor performance state control
 248          * responsibility. There isn't any equivalence in 1.0, but as many 1.x
 249          * ACPI tables contain _PCT and _PSS we also keep this value, unless
 250          * acpi_strict is set.
 251          */
 252         if (acpi_strict)
 253                 local_fadt->pstate_cnt = 0;
 254
 255         /*
 256          * Support for the _CST object and C States change notification.
 257          * This data item hasn't any 1.0 equivalence so leave it zero.
 258          */
 259         local_fadt->cst_cnt = 0;
 260
 261         /*
 262          * FADT Rev 2 was an interim FADT released between ACPI 1.0 and ACPI 2.0.
 263          * It primarily adds the FADT reset mechanism.
 264          */
 265         if ((original_fadt->revision == 2) &&
 266                 (original_fadt->length == sizeof (struct fadt_descriptor_rev2_minus))) {
 267                 /*
 268                  * Grab the entire generic address struct, plus the 1-byte reset value
 269                  * that immediately follows.
 270                  */
 271                 ACPI_MEMCPY (&local_fadt->reset_register,
 272                         &(ACPI_CAST_PTR (struct fadt_descriptor_rev2_minus, original_fadt))->reset_register,
 273                         sizeof (struct acpi_generic_address) + 1);
 274         }
 275         else {
 276                 /*
 277                  * Since there isn't any equivalence in 1.0 and since it is highly
 278                  * likely that a 1.0 system has legacy support.
 279                  */
 280                 local_fadt->iapc_boot_arch = BAF_LEGACY_DEVICES;
 281         }
 282
 283         /*
 284          * Convert the V1.0 block addresses to V2.0 GAS structures
 285          */
 286         acpi_tb_init_generic_address (&local_fadt->xpm1a_evt_blk, local_fadt->pm1_evt_len,
 287                           (acpi_physical_address)   local_fadt->V1_pm1a_evt_blk);
 288         acpi_tb_init_generic_address (&local_fadt->xpm1b_evt_blk, local_fadt->pm1_evt_len,
 289                           (acpi_physical_address)   local_fadt->V1_pm1b_evt_blk);
 290         acpi_tb_init_generic_address (&local_fadt->xpm1a_cnt_blk, local_fadt->pm1_cnt_len,
 291                           (acpi_physical_address)   local_fadt->V1_pm1a_cnt_blk);
 292         acpi_tb_init_generic_address (&local_fadt->xpm1b_cnt_blk, local_fadt->pm1_cnt_len,
 293                           (acpi_physical_address)   local_fadt->V1_pm1b_cnt_blk);
 294         acpi_tb_init_generic_address (&local_fadt->xpm2_cnt_blk, local_fadt->pm2_cnt_len,
 295                           (acpi_physical_address)   local_fadt->V1_pm2_cnt_blk);
 296         acpi_tb_init_generic_address (&local_fadt->xpm_tmr_blk, local_fadt->pm_tm_len,
 297                           (acpi_physical_address)   local_fadt->V1_pm_tmr_blk);
 298         acpi_tb_init_generic_address (&local_fadt->xgpe0_blk, 0,
 299                           (acpi_physical_address)   local_fadt->V1_gpe0_blk);
 300         acpi_tb_init_generic_address (&local_fadt->xgpe1_blk, 0,
 301                           (acpi_physical_address)   local_fadt->V1_gpe1_blk);
 302
 303         /* Create separate GAS structs for the PM1 Enable registers */
 304
 305         acpi_tb_init_generic_address (&acpi_gbl_xpm1a_enable,
 306                  (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
 307                  (acpi_physical_address) (local_fadt->xpm1a_evt_blk.address +
 308                         ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
 309
 310         /* PM1B is optional; leave null if not present */
 311
 312         if (local_fadt->xpm1b_evt_blk.address) {
 313                 acpi_tb_init_generic_address (&acpi_gbl_xpm1b_enable,
 314                          (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
 315                          (acpi_physical_address) (local_fadt->xpm1b_evt_blk.address +
 316                                 ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
 317         }
 318 }
 319
 320
 321 /*******************************************************************************
 322  *
 323  * FUNCTION:    acpi_tb_convert_fadt2
 324  *
 325  * PARAMETERS:  local_fadt      - Pointer to new FADT
 326  *              original_fadt   - Pointer to old FADT
 327  *
 328  * RETURN:      Populates local_fadt
 329  *
 330  * DESCRIPTION: Convert an ACPI 2.0 FADT to common internal format.
 331  *              Handles optional "X" fields.
 332  *
 333  ******************************************************************************/
 334
 335 static void
 336 acpi_tb_convert_fadt2 (
 337         struct fadt_descriptor_rev2    *local_fadt,
 338         struct fadt_descriptor_rev2    *original_fadt)
 339 {
 340
 341         /* We have an ACPI 2.0 FADT but we must copy it to our local buffer */
 342
 343         ACPI_MEMCPY (local_fadt, original_fadt, sizeof (struct fadt_descriptor_rev2));
 344
 345         /*
 346          * "X" fields are optional extensions to the original V1.0 fields, so
 347          * we must selectively expand V1.0 fields if the corresponding X field
 348          * is zero.
 349          */
 350         if (!(local_fadt->xfirmware_ctrl)) {
 351                 ACPI_STORE_ADDRESS (local_fadt->xfirmware_ctrl, local_fadt->V1_firmware_ctrl);
 352         }
 353
 354         if (!(local_fadt->Xdsdt)) {
 355                 ACPI_STORE_ADDRESS (local_fadt->Xdsdt, local_fadt->V1_dsdt);
 356         }
 357
 358         if (!(local_fadt->xpm1a_evt_blk.address)) {
 359                 acpi_tb_init_generic_address (&local_fadt->xpm1a_evt_blk,
 360                         local_fadt->pm1_evt_len, (acpi_physical_address) local_fadt->V1_pm1a_evt_blk);
 361         }
 362
 363         if (!(local_fadt->xpm1b_evt_blk.address)) {
 364                 acpi_tb_init_generic_address (&local_fadt->xpm1b_evt_blk,
 365                         local_fadt->pm1_evt_len, (acpi_physical_address) local_fadt->V1_pm1b_evt_blk);
 366         }
 367
 368         if (!(local_fadt->xpm1a_cnt_blk.address)) {
 369                 acpi_tb_init_generic_address (&local_fadt->xpm1a_cnt_blk,
 370                         local_fadt->pm1_cnt_len, (acpi_physical_address) local_fadt->V1_pm1a_cnt_blk);
 371         }
 372
 373         if (!(local_fadt->xpm1b_cnt_blk.address)) {
 374                 acpi_tb_init_generic_address (&local_fadt->xpm1b_cnt_blk,
 375                         local_fadt->pm1_cnt_len, (acpi_physical_address) local_fadt->V1_pm1b_cnt_blk);
 376         }
 377
 378         if (!(local_fadt->xpm2_cnt_blk.address)) {
 379                 acpi_tb_init_generic_address (&local_fadt->xpm2_cnt_blk,
 380                         local_fadt->pm2_cnt_len, (acpi_physical_address) local_fadt->V1_pm2_cnt_blk);
 381         }
 382
 383         if (!(local_fadt->xpm_tmr_blk.address)) {
 384                 acpi_tb_init_generic_address (&local_fadt->xpm_tmr_blk,
 385                         local_fadt->pm_tm_len, (acpi_physical_address) local_fadt->V1_pm_tmr_blk);
 386         }
 387
 388         if (!(local_fadt->xgpe0_blk.address)) {
 389                 acpi_tb_init_generic_address (&local_fadt->xgpe0_blk,
 390                         0, (acpi_physical_address) local_fadt->V1_gpe0_blk);
 391         }
 392
 393         if (!(local_fadt->xgpe1_blk.address)) {
 394                 acpi_tb_init_generic_address (&local_fadt->xgpe1_blk,
 395                         0, (acpi_physical_address) local_fadt->V1_gpe1_blk);
 396         }
 397
 398         /* Create separate GAS structs for the PM1 Enable registers */
 399
 400         acpi_tb_init_generic_address (&acpi_gbl_xpm1a_enable,
 401                 (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
 402                 (acpi_physical_address) (local_fadt->xpm1a_evt_blk.address +
 403                         ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
 404         acpi_gbl_xpm1a_enable.address_space_id = local_fadt->xpm1a_evt_blk.address_space_id;
 405
 406         /* PM1B is optional; leave null if not present */
 407
 408         if (local_fadt->xpm1b_evt_blk.address) {
 409                 acpi_tb_init_generic_address (&acpi_gbl_xpm1b_enable,
 410                         (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
 411                         (acpi_physical_address) (local_fadt->xpm1b_evt_blk.address +
 412                                 ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
 413                 acpi_gbl_xpm1b_enable.address_space_id = local_fadt->xpm1b_evt_blk.address_space_id;
 414         }
 415 }
 416
 417
 418 /*******************************************************************************
 419  *
 420  * FUNCTION:    acpi_tb_convert_table_fadt
 421  *
 422  * PARAMETERS:  None
 423  *
 424  * RETURN:      Status
 425  *
 426  * DESCRIPTION: Converts a BIOS supplied ACPI 1.0 FADT to a local
 427  *              ACPI 2.0 FADT. If the BIOS supplied a 2.0 FADT then it is simply
 428  *              copied to the local FADT.  The ACPI CA software uses this
 429  *              local FADT. Thus a significant amount of special #ifdef
 430  *              type codeing is saved.
 431  *
 432  ******************************************************************************/
 433
 434 acpi_status
 435 acpi_tb_convert_table_fadt (void)
 436 {
 437         struct fadt_descriptor_rev2    *local_fadt;
 438         struct acpi_table_desc         *table_desc;
 439
 440
 441         ACPI_FUNCTION_TRACE ("tb_convert_table_fadt");
 442
 443
 444         /*
 445          * acpi_gbl_FADT is valid. Validate the FADT length. The table must be
 446          * at least as long as the version 1.0 FADT
 447          */
 448         if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev1)) {
 449                 ACPI_REPORT_ERROR (("FADT is invalid, too short: 0x%X\n", acpi_gbl_FADT->length));
 450                 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
 451         }
 452
 453         /* Allocate buffer for the ACPI 2.0(+) FADT */
 454
 455         local_fadt = ACPI_MEM_CALLOCATE (sizeof (struct fadt_descriptor_rev2));
 456         if (!local_fadt) {
 457                 return_ACPI_STATUS (AE_NO_MEMORY);
 458         }
 459
 460         if (acpi_gbl_FADT->revision >= FADT2_REVISION_ID) {
 461                 if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev2)) {
 462                         /* Length is too short to be a V2.0 table */
 463
 464                         ACPI_REPORT_WARNING (("Inconsistent FADT length (0x%X) and revision (0x%X), using FADT V1.0 portion of table\n",
 465                                          acpi_gbl_FADT->length, acpi_gbl_FADT->revision));
 466
 467                         acpi_tb_convert_fadt1 (local_fadt, (void *) acpi_gbl_FADT);
 468                 }
 469                 else {
 470                         /* Valid V2.0 table */
 471
 472                         acpi_tb_convert_fadt2 (local_fadt, acpi_gbl_FADT);
 473                 }
 474         }
 475         else {
 476                 /* Valid V1.0 table */
 477
 478                 acpi_tb_convert_fadt1 (local_fadt, (void *) acpi_gbl_FADT);
 479         }
 480
 481         /*
 482          * Global FADT pointer will point to the new common V2.0 FADT
 483          */
 484         acpi_gbl_FADT = local_fadt;
 485         acpi_gbl_FADT->length = sizeof (FADT_DESCRIPTOR);
 486
 487         /* Free the original table */
 488
 489         table_desc = acpi_gbl_table_lists[ACPI_TABLE_FADT].next;
 490         acpi_tb_delete_single_table (table_desc);
 491
 492         /* Install the new table */
 493
 494         table_desc->pointer     = ACPI_CAST_PTR (struct acpi_table_header, acpi_gbl_FADT);
 495         table_desc->allocation  = ACPI_MEM_ALLOCATED;
 496         table_desc->length      = sizeof (struct fadt_descriptor_rev2);
 497
 498         /* Dump the entire FADT */
 499
 500         ACPI_DEBUG_PRINT ((ACPI_DB_TABLES,
 501                 "Hex dump of common internal FADT, size %d (%X)\n",
 502                 acpi_gbl_FADT->length, acpi_gbl_FADT->length));
 503         ACPI_DUMP_BUFFER ((u8 *) (acpi_gbl_FADT), acpi_gbl_FADT->length);
 504
 505         return_ACPI_STATUS (AE_OK);
 506 }
 507
 508
 509 /*******************************************************************************
 510  *
 511  * FUNCTION:    acpi_tb_convert_table_facs
 512  *
 513  * PARAMETERS:  table_info      - Info for currently installed FACS
 514  *
 515  * RETURN:      Status
 516  *
 517  * DESCRIPTION: Convert ACPI 1.0 and ACPI 2.0 FACS to a common internal
 518  *              table format.
 519  *
 520  ******************************************************************************/
 521
 522 acpi_status
 523 acpi_tb_build_common_facs (
 524         struct acpi_table_desc          *table_info)
 525 {
 526
 527         ACPI_FUNCTION_TRACE ("tb_build_common_facs");
 528
 529
 530         /* Absolute minimum length is 24, but the ACPI spec says 64 */
 531
 532         if (acpi_gbl_FACS->length < 24) {
 533                 ACPI_REPORT_ERROR (("Invalid FACS table length: 0x%X\n", acpi_gbl_FACS->length));
 534                 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
 535         }
 536
 537         if (acpi_gbl_FACS->length < 64) {
 538                 ACPI_REPORT_WARNING (("FACS is shorter than the ACPI specification allows: 0x%X, using anyway\n",
 539                         acpi_gbl_FACS->length));
 540         }
 541
 542         /* Copy fields to the new FACS */
 543
 544         acpi_gbl_common_fACS.global_lock = &(acpi_gbl_FACS->global_lock);
 545
 546         if ((acpi_gbl_RSDP->revision < 2) ||
 547                 (acpi_gbl_FACS->length < 32) ||
 548                 (!(acpi_gbl_FACS->xfirmware_waking_vector))) {
 549                 /* ACPI 1.0 FACS or short table or optional X_ field is zero */
 550
 551                 acpi_gbl_common_fACS.firmware_waking_vector = ACPI_CAST_PTR (u64, &(acpi_gbl_FACS->firmware_waking_vector));
 552                 acpi_gbl_common_fACS.vector_width = 32;
 553         }
 554         else {
 555                 /* ACPI 2.0 FACS with valid X_ field */
 556
 557                 acpi_gbl_common_fACS.firmware_waking_vector = &acpi_gbl_FACS->xfirmware_waking_vector;
 558                 acpi_gbl_common_fACS.vector_width = 64;
 559         }
 560
 561         return_ACPI_STATUS (AE_OK);
 562 }
 563
 564