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 #define _COMPONENT          ACPI_TABLES
  50 ACPI_MODULE_NAME("tbconvrt")
  51
  52 /* Local prototypes */
  53 static void
  54 acpi_tb_init_generic_address(struct acpi_generic_address *new_gas_struct,
  55                              u8 register_bit_width,
  56                              acpi_physical_address address);
  57
  58 static void
  59 acpi_tb_convert_fadt1(struct fadt_descriptor_rev2 *local_fadt,
  60                       struct fadt_descriptor_rev1 *original_fadt);
  61
  62 static void
  63 acpi_tb_convert_fadt2(struct fadt_descriptor_rev2 *local_fadt,
  64                       struct fadt_descriptor_rev2 *original_fadt);
  65
  66 u8 acpi_fadt_is_v1;
  67 EXPORT_SYMBOL(acpi_fadt_is_v1);
  68
  69 /*******************************************************************************
  70  *
  71  * FUNCTION:    acpi_tb_get_table_count
  72  *
  73  * PARAMETERS:  RSDP            - Pointer to the RSDP
  74  *              RSDT            - Pointer to the RSDT/XSDT
  75  *
  76  * RETURN:      The number of tables pointed to by the RSDT or XSDT.
  77  *
  78  * DESCRIPTION: Calculate the number of tables.  Automatically handles either
  79  *              an RSDT or XSDT.
  80  *
  81  ******************************************************************************/
  82
  83 u32
  84 acpi_tb_get_table_count(struct rsdp_descriptor *RSDP,
  85                         struct acpi_table_header *RSDT)
  86 {
  87         u32 pointer_size;
  88
  89         ACPI_FUNCTION_ENTRY();
  90
  91         /* RSDT pointers are 32 bits, XSDT pointers are 64 bits */
  92
  93         if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
  94                 pointer_size = sizeof(u32);
  95         } else {
  96                 pointer_size = sizeof(u64);
  97         }
  98
  99         /*
 100          * Determine the number of tables pointed to by the RSDT/XSDT.
 101          * This is defined by the ACPI Specification to be the number of
 102          * pointers contained within the RSDT/XSDT.  The size of the pointers
 103          * is architecture-dependent.
 104          */
 105         return ((RSDT->length -
 106                  sizeof(struct acpi_table_header)) / pointer_size);
 107 }
 108
 109 /*******************************************************************************
 110  *
 111  * FUNCTION:    acpi_tb_convert_to_xsdt
 112  *
 113  * PARAMETERS:  table_info      - Info about the RSDT
 114  *
 115  * RETURN:      Status
 116  *
 117  * DESCRIPTION: Convert an RSDT to an XSDT (internal common format)
 118  *
 119  ******************************************************************************/
 120
 121 acpi_status acpi_tb_convert_to_xsdt(struct acpi_table_desc *table_info)
 122 {
 123         acpi_size table_size;
 124         u32 i;
 125         XSDT_DESCRIPTOR *new_table;
 126
 127         ACPI_FUNCTION_ENTRY();
 128
 129         /* Compute size of the converted XSDT */
 130
 131         table_size = ((acpi_size) acpi_gbl_rsdt_table_count * sizeof(u64)) +
 132             sizeof(struct acpi_table_header);
 133
 134         /* Allocate an XSDT */
 135
 136         new_table = ACPI_MEM_CALLOCATE(table_size);
 137         if (!new_table) {
 138                 return (AE_NO_MEMORY);
 139         }
 140
 141         /* Copy the header and set the length */
 142
 143         ACPI_MEMCPY(new_table, table_info->pointer,
 144                     sizeof(struct acpi_table_header));
 145         new_table->length = (u32) table_size;
 146
 147         /* Copy the table pointers */
 148
 149         for (i = 0; i < acpi_gbl_rsdt_table_count; i++) {
 150                 /* RSDT pointers are 32 bits, XSDT pointers are 64 bits */
 151
 152                 if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
 153                         ACPI_STORE_ADDRESS(new_table->table_offset_entry[i],
 154                                            (ACPI_CAST_PTR
 155                                             (struct rsdt_descriptor_rev1,
 156                                              table_info->pointer))->
 157                                            table_offset_entry[i]);
 158                 } else {
 159                         new_table->table_offset_entry[i] =
 160                             (ACPI_CAST_PTR(XSDT_DESCRIPTOR,
 161                                            table_info->pointer))->
 162                             table_offset_entry[i];
 163                 }
 164         }
 165
 166         /* Delete the original table (either mapped or in a buffer) */
 167
 168         acpi_tb_delete_single_table(table_info);
 169
 170         /* Point the table descriptor to the new table */
 171
 172         table_info->pointer =
 173             ACPI_CAST_PTR(struct acpi_table_header, new_table);
 174         table_info->length = table_size;
 175         table_info->allocation = ACPI_MEM_ALLOCATED;
 176
 177         return (AE_OK);
 178 }
 179
 180 /*******************************************************************************
 181  *
 182  * FUNCTION:    acpi_tb_init_generic_address
 183  *
 184  * PARAMETERS:  new_gas_struct      - GAS struct to be initialized
 185  *              register_bit_width  - Width of this register
 186  *              Address             - Address of the register
 187  *
 188  * RETURN:      None
 189  *
 190  * DESCRIPTION: Initialize a GAS structure.
 191  *
 192  ******************************************************************************/
 193
 194 static void
 195 acpi_tb_init_generic_address(struct acpi_generic_address *new_gas_struct,
 196                              u8 register_bit_width,
 197                              acpi_physical_address address)
 198 {
 199
 200         ACPI_STORE_ADDRESS(new_gas_struct->address, address);
 201
 202         new_gas_struct->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
 203         new_gas_struct->register_bit_width = register_bit_width;
 204         new_gas_struct->register_bit_offset = 0;
 205         new_gas_struct->access_width = 0;
 206 }
 207
 208 /*******************************************************************************
 209  *
 210  * FUNCTION:    acpi_tb_convert_fadt1
 211  *
 212  * PARAMETERS:  local_fadt      - Pointer to new FADT
 213  *              original_fadt   - Pointer to old FADT
 214  *
 215  * RETURN:      None, populates local_fadt
 216  *
 217  * DESCRIPTION: Convert an ACPI 1.0 FADT to common internal format
 218  *
 219  ******************************************************************************/
 220
 221 static void
 222 acpi_tb_convert_fadt1(struct fadt_descriptor_rev2 *local_fadt,
 223                       struct fadt_descriptor_rev1 *original_fadt)
 224 {
 225
 226         /* ACPI 1.0 FACS */
 227         /* The BIOS stored FADT should agree with Revision 1.0 */
 228         acpi_fadt_is_v1 = 1;
 229
 230         /*
 231          * Copy the table header and the common part of the tables.
 232          *
 233          * The 2.0 table is an extension of the 1.0 table, so the entire 1.0
 234          * table can be copied first, then expand some fields to 64 bits.
 235          */
 236         ACPI_MEMCPY(local_fadt, original_fadt,
 237                     sizeof(struct fadt_descriptor_rev1));
 238
 239         /* Convert table pointers to 64-bit fields */
 240
 241         ACPI_STORE_ADDRESS(local_fadt->xfirmware_ctrl,
 242                            local_fadt->V1_firmware_ctrl);
 243         ACPI_STORE_ADDRESS(local_fadt->Xdsdt, local_fadt->V1_dsdt);
 244
 245         /*
 246          * System Interrupt Model isn't used in ACPI 2.0
 247          * (local_fadt->Reserved1 = 0;)
 248          */
 249
 250         /*
 251          * This field is set by the OEM to convey the preferred power management
 252          * profile to OSPM. It doesn't have any 1.0 equivalence.  Since we don't
 253          * know what kind of 32-bit system this is, we will use "unspecified".
 254          */
 255         local_fadt->prefer_PM_profile = PM_UNSPECIFIED;
 256
 257         /*
 258          * Processor Performance State Control. This is the value OSPM writes to
 259          * the SMI_CMD register to assume processor performance state control
 260          * responsibility. There isn't any equivalence in 1.0, but as many 1.x
 261          * ACPI tables contain _PCT and _PSS we also keep this value, unless
 262          * acpi_strict is set.
 263          */
 264         if (acpi_strict)
 265                 local_fadt->pstate_cnt = 0;
 266
 267         /*
 268          * Support for the _CST object and C States change notification.
 269          * This data item hasn't any 1.0 equivalence so leave it zero.
 270          */
 271         local_fadt->cst_cnt = 0;
 272
 273         /*
 274          * FADT Rev 2 was an interim FADT released between ACPI 1.0 and ACPI 2.0.
 275          * It primarily adds the FADT reset mechanism.
 276          */
 277         if ((original_fadt->revision == 2) &&
 278             (original_fadt->length ==
 279              sizeof(struct fadt_descriptor_rev2_minus))) {
 280                 /*
 281                  * Grab the entire generic address struct, plus the 1-byte reset value
 282                  * that immediately follows.
 283                  */
 284                 ACPI_MEMCPY(&local_fadt->reset_register,
 285                             &(ACPI_CAST_PTR(struct fadt_descriptor_rev2_minus,
 286                                             original_fadt))->reset_register,
 287                             sizeof(struct acpi_generic_address) + 1);
 288         } else {
 289                 /*
 290                  * Since there isn't any equivalence in 1.0 and since it is highly
 291                  * likely that a 1.0 system has legacy support.
 292                  */
 293                 local_fadt->iapc_boot_arch = BAF_LEGACY_DEVICES;
 294         }
 295
 296         /*
 297          * Convert the V1.0 block addresses to V2.0 GAS structures
 298          */
 299         acpi_tb_init_generic_address(&local_fadt->xpm1a_evt_blk,
 300                                      local_fadt->pm1_evt_len,
 301                                      (acpi_physical_address) local_fadt->
 302                                      V1_pm1a_evt_blk);
 303         acpi_tb_init_generic_address(&local_fadt->xpm1b_evt_blk,
 304                                      local_fadt->pm1_evt_len,
 305                                      (acpi_physical_address) local_fadt->
 306                                      V1_pm1b_evt_blk);
 307         acpi_tb_init_generic_address(&local_fadt->xpm1a_cnt_blk,
 308                                      local_fadt->pm1_cnt_len,
 309                                      (acpi_physical_address) local_fadt->
 310                                      V1_pm1a_cnt_blk);
 311         acpi_tb_init_generic_address(&local_fadt->xpm1b_cnt_blk,
 312                                      local_fadt->pm1_cnt_len,
 313                                      (acpi_physical_address) local_fadt->
 314                                      V1_pm1b_cnt_blk);
 315         acpi_tb_init_generic_address(&local_fadt->xpm2_cnt_blk,
 316                                      local_fadt->pm2_cnt_len,
 317                                      (acpi_physical_address) local_fadt->
 318                                      V1_pm2_cnt_blk);
 319         acpi_tb_init_generic_address(&local_fadt->xpm_tmr_blk,
 320                                      local_fadt->pm_tm_len,
 321                                      (acpi_physical_address) local_fadt->
 322                                      V1_pm_tmr_blk);
 323         acpi_tb_init_generic_address(&local_fadt->xgpe0_blk, 0,
 324                                      (acpi_physical_address) local_fadt->
 325                                      V1_gpe0_blk);
 326         acpi_tb_init_generic_address(&local_fadt->xgpe1_blk, 0,
 327                                      (acpi_physical_address) local_fadt->
 328                                      V1_gpe1_blk);
 329
 330         /* Create separate GAS structs for the PM1 Enable registers */
 331
 332         acpi_tb_init_generic_address(&acpi_gbl_xpm1a_enable,
 333                                      (u8) ACPI_DIV_2(acpi_gbl_FADT->
 334                                                      pm1_evt_len),
 335                                      (acpi_physical_address)
 336                                      (local_fadt->xpm1a_evt_blk.address +
 337                                       ACPI_DIV_2(acpi_gbl_FADT->pm1_evt_len)));
 338
 339         /* PM1B is optional; leave null if not present */
 340
 341         if (local_fadt->xpm1b_evt_blk.address) {
 342                 acpi_tb_init_generic_address(&acpi_gbl_xpm1b_enable,
 343                                              (u8) ACPI_DIV_2(acpi_gbl_FADT->
 344                                                              pm1_evt_len),
 345                                              (acpi_physical_address)
 346                                              (local_fadt->xpm1b_evt_blk.
 347                                               address +
 348                                               ACPI_DIV_2(acpi_gbl_FADT->
 349                                                          pm1_evt_len)));
 350         }
 351 }
 352
 353 /*******************************************************************************
 354  *
 355  * FUNCTION:    acpi_tb_convert_fadt2
 356  *
 357  * PARAMETERS:  local_fadt      - Pointer to new FADT
 358  *              original_fadt   - Pointer to old FADT
 359  *
 360  * RETURN:      None, populates local_fadt
 361  *
 362  * DESCRIPTION: Convert an ACPI 2.0 FADT to common internal format.
 363  *              Handles optional "X" fields.
 364  *
 365  ******************************************************************************/
 366
 367 static void
 368 acpi_tb_convert_fadt2(struct fadt_descriptor_rev2 *local_fadt,
 369                       struct fadt_descriptor_rev2 *original_fadt)
 370 {
 371
 372         /* We have an ACPI 2.0 FADT but we must copy it to our local buffer */
 373
 374         ACPI_MEMCPY(local_fadt, original_fadt,
 375                     sizeof(struct fadt_descriptor_rev2));
 376
 377         /*
 378          * "X" fields are optional extensions to the original V1.0 fields, so
 379          * we must selectively expand V1.0 fields if the corresponding X field
 380          * is zero.
 381          */
 382         if (!(local_fadt->xfirmware_ctrl)) {
 383                 ACPI_STORE_ADDRESS(local_fadt->xfirmware_ctrl,
 384                                    local_fadt->V1_firmware_ctrl);
 385         }
 386
 387         if (!(local_fadt->Xdsdt)) {
 388                 ACPI_STORE_ADDRESS(local_fadt->Xdsdt, local_fadt->V1_dsdt);
 389         }
 390
 391         if (!(local_fadt->xpm1a_evt_blk.address)) {
 392                 acpi_tb_init_generic_address(&local_fadt->xpm1a_evt_blk,
 393                                              local_fadt->pm1_evt_len,
 394                                              (acpi_physical_address)
 395                                              local_fadt->V1_pm1a_evt_blk);
 396         }
 397
 398         if (!(local_fadt->xpm1b_evt_blk.address)) {
 399                 acpi_tb_init_generic_address(&local_fadt->xpm1b_evt_blk,
 400                                              local_fadt->pm1_evt_len,
 401                                              (acpi_physical_address)
 402                                              local_fadt->V1_pm1b_evt_blk);
 403         }
 404
 405         if (!(local_fadt->xpm1a_cnt_blk.address)) {
 406                 acpi_tb_init_generic_address(&local_fadt->xpm1a_cnt_blk,
 407                                              local_fadt->pm1_cnt_len,
 408                                              (acpi_physical_address)
 409                                              local_fadt->V1_pm1a_cnt_blk);
 410         }
 411
 412         if (!(local_fadt->xpm1b_cnt_blk.address)) {
 413                 acpi_tb_init_generic_address(&local_fadt->xpm1b_cnt_blk,
 414                                              local_fadt->pm1_cnt_len,
 415                                              (acpi_physical_address)
 416                                              local_fadt->V1_pm1b_cnt_blk);
 417         }
 418
 419         if (!(local_fadt->xpm2_cnt_blk.address)) {
 420                 acpi_tb_init_generic_address(&local_fadt->xpm2_cnt_blk,
 421                                              local_fadt->pm2_cnt_len,
 422                                              (acpi_physical_address)
 423                                              local_fadt->V1_pm2_cnt_blk);
 424         }
 425
 426         if (!(local_fadt->xpm_tmr_blk.address)) {
 427                 acpi_tb_init_generic_address(&local_fadt->xpm_tmr_blk,
 428                                              local_fadt->pm_tm_len,
 429                                              (acpi_physical_address)
 430                                              local_fadt->V1_pm_tmr_blk);
 431         }
 432
 433         if (!(local_fadt->xgpe0_blk.address)) {
 434                 acpi_tb_init_generic_address(&local_fadt->xgpe0_blk,
 435                                              0,
 436                                              (acpi_physical_address)
 437                                              local_fadt->V1_gpe0_blk);
 438         }
 439
 440         if (!(local_fadt->xgpe1_blk.address)) {
 441                 acpi_tb_init_generic_address(&local_fadt->xgpe1_blk,
 442                                              0,
 443                                              (acpi_physical_address)
 444                                              local_fadt->V1_gpe1_blk);
 445         }
 446
 447         /* Create separate GAS structs for the PM1 Enable registers */
 448
 449         acpi_tb_init_generic_address(&acpi_gbl_xpm1a_enable,
 450                                      (u8) ACPI_DIV_2(acpi_gbl_FADT->
 451                                                      pm1_evt_len),
 452                                      (acpi_physical_address)
 453                                      (local_fadt->xpm1a_evt_blk.address +
 454                                       ACPI_DIV_2(acpi_gbl_FADT->pm1_evt_len)));
 455
 456         acpi_gbl_xpm1a_enable.address_space_id =
 457             local_fadt->xpm1a_evt_blk.address_space_id;
 458
 459         /* PM1B is optional; leave null if not present */
 460
 461         if (local_fadt->xpm1b_evt_blk.address) {
 462                 acpi_tb_init_generic_address(&acpi_gbl_xpm1b_enable,
 463                                              (u8) ACPI_DIV_2(acpi_gbl_FADT->
 464                                                              pm1_evt_len),
 465                                              (acpi_physical_address)
 466                                              (local_fadt->xpm1b_evt_blk.
 467                                               address +
 468                                               ACPI_DIV_2(acpi_gbl_FADT->
 469                                                          pm1_evt_len)));
 470
 471                 acpi_gbl_xpm1b_enable.address_space_id =
 472                     local_fadt->xpm1b_evt_blk.address_space_id;
 473         }
 474 }
 475
 476 /*******************************************************************************
 477  *
 478  * FUNCTION:    acpi_tb_convert_table_fadt
 479  *
 480  * PARAMETERS:  None
 481  *
 482  * RETURN:      Status
 483  *
 484  * DESCRIPTION: Converts a BIOS supplied ACPI 1.0 FADT to a local
 485  *              ACPI 2.0 FADT. If the BIOS supplied a 2.0 FADT then it is simply
 486  *              copied to the local FADT.  The ACPI CA software uses this
 487  *              local FADT. Thus a significant amount of special #ifdef
 488  *              type codeing is saved.
 489  *
 490  ******************************************************************************/
 491
 492 acpi_status acpi_tb_convert_table_fadt(void)
 493 {
 494         struct fadt_descriptor_rev2 *local_fadt;
 495         struct acpi_table_desc *table_desc;
 496
 497         ACPI_FUNCTION_TRACE("tb_convert_table_fadt");
 498
 499         /*
 500          * acpi_gbl_FADT is valid. Validate the FADT length. The table must be
 501          * at least as long as the version 1.0 FADT
 502          */
 503         if (acpi_gbl_FADT->length < sizeof(struct fadt_descriptor_rev1)) {
 504                 ACPI_REPORT_ERROR(("FADT is invalid, too short: 0x%X\n",
 505                                    acpi_gbl_FADT->length));
 506                 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 507         }
 508
 509         /* Allocate buffer for the ACPI 2.0(+) FADT */
 510
 511         local_fadt = ACPI_MEM_CALLOCATE(sizeof(struct fadt_descriptor_rev2));
 512         if (!local_fadt) {
 513                 return_ACPI_STATUS(AE_NO_MEMORY);
 514         }
 515
 516         if (acpi_gbl_FADT->revision >= FADT2_REVISION_ID) {
 517                 if (acpi_gbl_FADT->length < sizeof(struct fadt_descriptor_rev2)) {
 518                         /* Length is too short to be a V2.0 table */
 519
 520                         ACPI_REPORT_WARNING(("Inconsistent FADT length (0x%X) and revision (0x%X), using FADT V1.0 portion of table\n", acpi_gbl_FADT->length, acpi_gbl_FADT->revision));
 521
 522                         acpi_tb_convert_fadt1(local_fadt,
 523                                               (void *)acpi_gbl_FADT);
 524                 } else {
 525                         /* Valid V2.0 table */
 526
 527                         acpi_tb_convert_fadt2(local_fadt, acpi_gbl_FADT);
 528                 }
 529         } else {
 530                 /* Valid V1.0 table */
 531
 532                 acpi_tb_convert_fadt1(local_fadt, (void *)acpi_gbl_FADT);
 533         }
 534
 535         /* Global FADT pointer will point to the new common V2.0 FADT */
 536
 537         acpi_gbl_FADT = local_fadt;
 538         acpi_gbl_FADT->length = sizeof(FADT_DESCRIPTOR);
 539
 540         /* Free the original table */
 541
 542         table_desc = acpi_gbl_table_lists[ACPI_TABLE_FADT].next;
 543         acpi_tb_delete_single_table(table_desc);
 544
 545         /* Install the new table */
 546
 547         table_desc->pointer =
 548             ACPI_CAST_PTR(struct acpi_table_header, acpi_gbl_FADT);
 549         table_desc->allocation = ACPI_MEM_ALLOCATED;
 550         table_desc->length = sizeof(struct fadt_descriptor_rev2);
 551
 552         /* Dump the entire FADT */
 553
 554         ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
 555                           "Hex dump of common internal FADT, size %d (%X)\n",
 556                           acpi_gbl_FADT->length, acpi_gbl_FADT->length));
 557         ACPI_DUMP_BUFFER((u8 *) (acpi_gbl_FADT), acpi_gbl_FADT->length);
 558
 559         return_ACPI_STATUS(AE_OK);
 560 }
 561
 562 /*******************************************************************************
 563  *
 564  * FUNCTION:    acpi_tb_build_common_facs
 565  *
 566  * PARAMETERS:  table_info      - Info for currently installed FACS
 567  *
 568  * RETURN:      Status
 569  *
 570  * DESCRIPTION: Convert ACPI 1.0 and ACPI 2.0 FACS to a common internal
 571  *              table format.
 572  *
 573  ******************************************************************************/
 574
 575 acpi_status acpi_tb_build_common_facs(struct acpi_table_desc *table_info)
 576 {
 577
 578         ACPI_FUNCTION_TRACE("tb_build_common_facs");
 579
 580         /* Absolute minimum length is 24, but the ACPI spec says 64 */
 581
 582         if (acpi_gbl_FACS->length < 24) {
 583                 ACPI_REPORT_ERROR(("Invalid FACS table length: 0x%X\n",
 584                                    acpi_gbl_FACS->length));
 585                 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 586         }
 587
 588         if (acpi_gbl_FACS->length < 64) {
 589                 ACPI_REPORT_WARNING(("FACS is shorter than the ACPI specification allows: 0x%X, using anyway\n", acpi_gbl_FACS->length));
 590         }
 591
 592         /* Copy fields to the new FACS */
 593
 594         acpi_gbl_common_fACS.global_lock = &(acpi_gbl_FACS->global_lock);
 595
 596         if ((acpi_gbl_RSDP->revision < 2) ||
 597             (acpi_gbl_FACS->length < 32) ||
 598             (!(acpi_gbl_FACS->xfirmware_waking_vector))) {
 599                 /* ACPI 1.0 FACS or short table or optional X_ field is zero */
 600
 601                 acpi_gbl_common_fACS.firmware_waking_vector = ACPI_CAST_PTR(u64,
 602                                                                             &
 603                                                                             (acpi_gbl_FACS->
 604                                                                              firmware_waking_vector));
 605                 acpi_gbl_common_fACS.vector_width = 32;
 606         } else {
 607                 /* ACPI 2.0 FACS with valid X_ field */
 608
 609                 acpi_gbl_common_fACS.firmware_waking_vector =
 610                     &acpi_gbl_FACS->xfirmware_waking_vector;
 611                 acpi_gbl_common_fACS.vector_width = 64;
 612         }
 613
 614         return_ACPI_STATUS(AE_OK);
 615 }