drivers/acpi/acpica/tbfadt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbfadt   - FADT table utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, Intel Corp.
   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 "accommon.h"
  46 #include "actables.h"
  47
  48 #define _COMPONENT          ACPI_TABLES
  49 ACPI_MODULE_NAME("tbfadt")
  50
  51 /* Local prototypes */
  52 static inline void
  53 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
  54                              u8 space_id, u8 byte_width, u64 address);
  55
  56 static void acpi_tb_convert_fadt(void);
  57
  58 static void acpi_tb_validate_fadt(void);
  59
  60 static void acpi_tb_setup_fadt_registers(void);
  61
  62 /* Table for conversion of FADT to common internal format and FADT validation */
  63
  64 typedef struct acpi_fadt_info {
  65         char *name;
  66         u8 address64;
  67         u8 address32;
  68         u8 length;
  69         u8 default_length;
  70         u8 type;
  71
  72 } acpi_fadt_info;
  73
  74 #define ACPI_FADT_REQUIRED          1
  75 #define ACPI_FADT_SEPARATE_LENGTH   2
  76
  77 static struct acpi_fadt_info fadt_info_table[] = {
  78         {"Pm1aEventBlock",
  79          ACPI_FADT_OFFSET(xpm1a_event_block),
  80          ACPI_FADT_OFFSET(pm1a_event_block),
  81          ACPI_FADT_OFFSET(pm1_event_length),
  82          ACPI_PM1_REGISTER_WIDTH * 2,   /* Enable + Status register */
  83          ACPI_FADT_REQUIRED},
  84
  85         {"Pm1bEventBlock",
  86          ACPI_FADT_OFFSET(xpm1b_event_block),
  87          ACPI_FADT_OFFSET(pm1b_event_block),
  88          ACPI_FADT_OFFSET(pm1_event_length),
  89          ACPI_PM1_REGISTER_WIDTH * 2,   /* Enable + Status register */
  90          0},
  91
  92         {"Pm1aControlBlock",
  93          ACPI_FADT_OFFSET(xpm1a_control_block),
  94          ACPI_FADT_OFFSET(pm1a_control_block),
  95          ACPI_FADT_OFFSET(pm1_control_length),
  96          ACPI_PM1_REGISTER_WIDTH,
  97          ACPI_FADT_REQUIRED},
  98
  99         {"Pm1bControlBlock",
 100          ACPI_FADT_OFFSET(xpm1b_control_block),
 101          ACPI_FADT_OFFSET(pm1b_control_block),
 102          ACPI_FADT_OFFSET(pm1_control_length),
 103          ACPI_PM1_REGISTER_WIDTH,
 104          0},
 105
 106         {"Pm2ControlBlock",
 107          ACPI_FADT_OFFSET(xpm2_control_block),
 108          ACPI_FADT_OFFSET(pm2_control_block),
 109          ACPI_FADT_OFFSET(pm2_control_length),
 110          ACPI_PM2_REGISTER_WIDTH,
 111          ACPI_FADT_SEPARATE_LENGTH},
 112
 113         {"PmTimerBlock",
 114          ACPI_FADT_OFFSET(xpm_timer_block),
 115          ACPI_FADT_OFFSET(pm_timer_block),
 116          ACPI_FADT_OFFSET(pm_timer_length),
 117          ACPI_PM_TIMER_WIDTH,
 118          ACPI_FADT_REQUIRED},
 119
 120         {"Gpe0Block",
 121          ACPI_FADT_OFFSET(xgpe0_block),
 122          ACPI_FADT_OFFSET(gpe0_block),
 123          ACPI_FADT_OFFSET(gpe0_block_length),
 124          0,
 125          ACPI_FADT_SEPARATE_LENGTH},
 126
 127         {"Gpe1Block",
 128          ACPI_FADT_OFFSET(xgpe1_block),
 129          ACPI_FADT_OFFSET(gpe1_block),
 130          ACPI_FADT_OFFSET(gpe1_block_length),
 131          0,
 132          ACPI_FADT_SEPARATE_LENGTH}
 133 };
 134
 135 #define ACPI_FADT_INFO_ENTRIES        (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
 136
 137 /* Table used to split Event Blocks into separate status/enable registers */
 138
 139 typedef struct acpi_fadt_pm_info {
 140         struct acpi_generic_address *target;
 141         u8 source;
 142         u8 register_num;
 143
 144 } acpi_fadt_pm_info;
 145
 146 static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
 147         {&acpi_gbl_xpm1a_status,
 148          ACPI_FADT_OFFSET(xpm1a_event_block),
 149          0},
 150
 151         {&acpi_gbl_xpm1a_enable,
 152          ACPI_FADT_OFFSET(xpm1a_event_block),
 153          1},
 154
 155         {&acpi_gbl_xpm1b_status,
 156          ACPI_FADT_OFFSET(xpm1b_event_block),
 157          0},
 158
 159         {&acpi_gbl_xpm1b_enable,
 160          ACPI_FADT_OFFSET(xpm1b_event_block),
 161          1}
 162 };
 163
 164 #define ACPI_FADT_PM_INFO_ENTRIES   (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
 165
 166 /*******************************************************************************
 167  *
 168  * FUNCTION:    acpi_tb_init_generic_address
 169  *
 170  * PARAMETERS:  generic_address     - GAS struct to be initialized
 171  *              byte_width          - Width of this register
 172  *              Address             - Address of the register
 173  *
 174  * RETURN:      None
 175  *
 176  * DESCRIPTION: Initialize a Generic Address Structure (GAS)
 177  *              See the ACPI specification for a full description and
 178  *              definition of this structure.
 179  *
 180  ******************************************************************************/
 181
 182 static inline void
 183 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
 184                              u8 space_id, u8 byte_width, u64 address)
 185 {
 186
 187         /*
 188          * The 64-bit Address field is non-aligned in the byte packed
 189          * GAS struct.
 190          */
 191         ACPI_MOVE_64_TO_64(&generic_address->address, &address);
 192
 193         /* All other fields are byte-wide */
 194
 195         generic_address->space_id = space_id;
 196         generic_address->bit_width = (u8)ACPI_MUL_8(byte_width);
 197         generic_address->bit_offset = 0;
 198         generic_address->access_width = 0;      /* Access width ANY */
 199 }
 200
 201 /*******************************************************************************
 202  *
 203  * FUNCTION:    acpi_tb_parse_fadt
 204  *
 205  * PARAMETERS:  table_index         - Index for the FADT
 206  *
 207  * RETURN:      None
 208  *
 209  * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
 210  *              (FADT contains the addresses of the DSDT and FACS)
 211  *
 212  ******************************************************************************/
 213
 214 void acpi_tb_parse_fadt(u32 table_index)
 215 {
 216         u32 length;
 217         struct acpi_table_header *table;
 218
 219         /*
 220          * The FADT has multiple versions with different lengths,
 221          * and it contains pointers to both the DSDT and FACS tables.
 222          *
 223          * Get a local copy of the FADT and convert it to a common format
 224          * Map entire FADT, assumed to be smaller than one page.
 225          */
 226         length = acpi_gbl_root_table_list.tables[table_index].length;
 227
 228         table =
 229             acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
 230                                address, length);
 231         if (!table) {
 232                 return;
 233         }
 234
 235         /*
 236          * Validate the FADT checksum before we copy the table. Ignore
 237          * checksum error as we want to try to get the DSDT and FACS.
 238          */
 239         (void)acpi_tb_verify_checksum(table, length);
 240
 241         /* Create a local copy of the FADT in common ACPI 2.0+ format */
 242
 243         acpi_tb_create_local_fadt(table, length);
 244
 245         /* All done with the real FADT, unmap it */
 246
 247         acpi_os_unmap_memory(table, length);
 248
 249         /* Obtain the DSDT and FACS tables via their addresses within the FADT */
 250
 251         acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
 252                               ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
 253
 254         acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
 255                               ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
 256 }
 257
 258 /*******************************************************************************
 259  *
 260  * FUNCTION:    acpi_tb_create_local_fadt
 261  *
 262  * PARAMETERS:  Table               - Pointer to BIOS FADT
 263  *              Length              - Length of the table
 264  *
 265  * RETURN:      None
 266  *
 267  * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
 268  *              Performs validation on some important FADT fields.
 269  *
 270  * NOTE:        We create a local copy of the FADT regardless of the version.
 271  *
 272  ******************************************************************************/
 273
 274 void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
 275 {
 276
 277         /*
 278          * Check if the FADT is larger than the largest table that we expect
 279          * (the ACPI 2.0/3.0 version). If so, truncate the table, and issue
 280          * a warning.
 281          */
 282         if (length > sizeof(struct acpi_table_fadt)) {
 283                 ACPI_WARNING((AE_INFO,
 284                               "FADT (revision %u) is longer than ACPI 2.0 version, "
 285                               "truncating length 0x%X to 0x%zX",
 286                               table->revision, (unsigned)length,
 287                               sizeof(struct acpi_table_fadt)));
 288         }
 289
 290         /* Clear the entire local FADT */
 291
 292         ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
 293
 294         /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
 295
 296         ACPI_MEMCPY(&acpi_gbl_FADT, table,
 297                     ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
 298
 299         /* Convert the local copy of the FADT to the common internal format */
 300
 301         acpi_tb_convert_fadt();
 302
 303         /* Validate FADT values now, before we make any changes */
 304
 305         acpi_tb_validate_fadt();
 306
 307         /* Initialize the global ACPI register structures */
 308
 309         acpi_tb_setup_fadt_registers();
 310 }
 311
 312 /*******************************************************************************
 313  *
 314  * FUNCTION:    acpi_tb_convert_fadt
 315  *
 316  * PARAMETERS:  None, uses acpi_gbl_FADT
 317  *
 318  * RETURN:      None
 319  *
 320  * DESCRIPTION: Converts all versions of the FADT to a common internal format.
 321  *              Expand all 32-bit addresses to 64-bit.
 322  *
 323  * NOTE:        acpi_gbl_FADT must be of size (struct acpi_table_fadt),
 324  *              and must contain a copy of the actual FADT.
 325  *
 326  * ACPICA will use the "X" fields of the FADT for all addresses.
 327  *
 328  * "X" fields are optional extensions to the original V1.0 fields. Even if
 329  * they are present in the structure, they can be optionally not used by
 330  * setting them to zero. Therefore, we must selectively expand V1.0 fields
 331  * if the corresponding X field is zero.
 332  *
 333  * For ACPI 1.0 FADTs, all address fields are expanded to the corresponding
 334  * "X" fields.
 335  *
 336  * For ACPI 2.0 FADTs, any "X" fields that are NULL are filled in by
 337  * expanding the corresponding ACPI 1.0 field.
 338  *
 339  ******************************************************************************/
 340
 341 static void acpi_tb_convert_fadt(void)
 342 {
 343         struct acpi_generic_address *target64;
 344         u32 i;
 345
 346         /* Update the local FADT table header length */
 347
 348         acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
 349
 350         /*
 351          * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
 352          * Later code will always use the X 64-bit field. Also, check for an
 353          * address mismatch between the 32-bit and 64-bit address fields
 354          * (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate
 355          * the presence of two FACS or two DSDT tables.
 356          */
 357         if (!acpi_gbl_FADT.Xfacs) {
 358                 acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
 359         } else if (acpi_gbl_FADT.facs &&
 360                    (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
 361                 ACPI_WARNING((AE_INFO,
 362                     "32/64 FACS address mismatch in FADT - two FACS tables!"));
 363         }
 364
 365         if (!acpi_gbl_FADT.Xdsdt) {
 366                 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
 367         } else if (acpi_gbl_FADT.dsdt &&
 368                    (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
 369                 ACPI_WARNING((AE_INFO,
 370                     "32/64 DSDT address mismatch in FADT - two DSDT tables!"));
 371         }
 372
 373         /*
 374          * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
 375          * should be zero are indeed zero. This will workaround BIOSs that
 376          * inadvertently place values in these fields.
 377          *
 378          * The ACPI 1.0 reserved fields that will be zeroed are the bytes located at
 379          * offset 45, 55, 95, and the word located at offset 109, 110.
 380          */
 381         if (acpi_gbl_FADT.header.revision < FADT2_REVISION_ID) {
 382                 acpi_gbl_FADT.preferred_profile = 0;
 383                 acpi_gbl_FADT.pstate_control = 0;
 384                 acpi_gbl_FADT.cst_control = 0;
 385                 acpi_gbl_FADT.boot_flags = 0;
 386         }
 387
 388         /*
 389          * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
 390          * generic address structures as necessary. Later code will always use
 391          * the 64-bit address structures.
 392          */
 393         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 394                 target64 =
 395                     ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
 396                                  fadt_info_table[i].address64);
 397
 398                 /* Expand only if the 64-bit X target is null */
 399
 400                 if (!target64->address) {
 401
 402                         /* The space_id is always I/O for the 32-bit legacy address fields */
 403
 404                         acpi_tb_init_generic_address(target64,
 405                                                      ACPI_ADR_SPACE_SYSTEM_IO,
 406                                                      *ACPI_ADD_PTR(u8,
 407                                                                    &acpi_gbl_FADT,
 408                                                                    fadt_info_table
 409                                                                    [i].length),
 410                                                      (u64) * ACPI_ADD_PTR(u32,
 411                                                                           &acpi_gbl_FADT,
 412                                                                           fadt_info_table
 413                                                                           [i].
 414                                                                           address32));
 415                 }
 416         }
 417 }
 418
 419 /******************************************************************************
 420  *
 421  * FUNCTION:    acpi_tb_validate_fadt
 422  *
 423  * PARAMETERS:  Table           - Pointer to the FADT to be validated
 424  *
 425  * RETURN:      None
 426  *
 427  * DESCRIPTION: Validate various important fields within the FADT. If a problem
 428  *              is found, issue a message, but no status is returned.
 429  *              Used by both the table manager and the disassembler.
 430  *
 431  * Possible additional checks:
 432  * (acpi_gbl_FADT.pm1_event_length >= 4)
 433  * (acpi_gbl_FADT.pm1_control_length >= 2)
 434  * (acpi_gbl_FADT.pm_timer_length >= 4)
 435  * Gpe block lengths must be multiple of 2
 436  *
 437  ******************************************************************************/
 438
 439 static void acpi_tb_validate_fadt(void)
 440 {
 441         char *name;
 442         u32 *address32;
 443         struct acpi_generic_address *address64;
 444         u8 length;
 445         u32 i;
 446
 447         /*
 448          * Check for FACS and DSDT address mismatches. An address mismatch between
 449          * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
 450          * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
 451          */
 452         if (acpi_gbl_FADT.facs &&
 453             (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
 454                 ACPI_WARNING((AE_INFO,
 455                               "32/64X FACS address mismatch in FADT - "
 456                               "two FACS tables! %8.8X/%8.8X%8.8X",
 457                               acpi_gbl_FADT.facs,
 458                               ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs)));
 459         }
 460
 461         if (acpi_gbl_FADT.dsdt &&
 462             (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
 463                 ACPI_WARNING((AE_INFO,
 464                               "32/64X DSDT address mismatch in FADT - "
 465                               "two DSDT tables! %8.8X/%8.8X%8.8X",
 466                               acpi_gbl_FADT.dsdt,
 467                               ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt)));
 468         }
 469
 470         /* Examine all of the 64-bit extended address fields (X fields) */
 471
 472         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 473                 /*
 474                  * Generate pointers to the 32-bit and 64-bit addresses, get the
 475                  * register length (width), and the register name
 476                  */
 477                 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
 478                                          &acpi_gbl_FADT,
 479                                          fadt_info_table[i].address64);
 480                 address32 =
 481                     ACPI_ADD_PTR(u32, &acpi_gbl_FADT,
 482                                  fadt_info_table[i].address32);
 483                 length =
 484                     *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
 485                                   fadt_info_table[i].length);
 486                 name = fadt_info_table[i].name;
 487
 488                 /*
 489                  * For each extended field, check for length mismatch between the
 490                  * legacy length field and the corresponding 64-bit X length field.
 491                  */
 492                 if (address64 && (address64->bit_width != ACPI_MUL_8(length))) {
 493                         ACPI_WARNING((AE_INFO,
 494                                       "32/64X length mismatch in %s: %d/%d",
 495                                       name, ACPI_MUL_8(length),
 496                                       address64->bit_width));
 497                 }
 498
 499                 if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
 500                         /*
 501                          * Field is required (Pm1a_event, Pm1a_control, pm_timer).
 502                          * Both the address and length must be non-zero.
 503                          */
 504                         if (!address64->address || !length) {
 505                                 ACPI_ERROR((AE_INFO,
 506                                             "Required field %s has zero address and/or length: %8.8X%8.8X/%X",
 507                                             name,
 508                                             ACPI_FORMAT_UINT64(address64->
 509                                                                address),
 510                                             length));
 511                         }
 512                 } else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
 513                         /*
 514                          * Field is optional (PM2Control, GPE0, GPE1) AND has its own
 515                          * length field. If present, both the address and length must be valid.
 516                          */
 517                         if ((address64->address && !length)
 518                             || (!address64->address && length)) {
 519                                 ACPI_WARNING((AE_INFO,
 520                                               "Optional field %s has zero address or length: %8.8X%8.8X/%X",
 521                                               name,
 522                                               ACPI_FORMAT_UINT64(address64->
 523                                                                  address),
 524                                               length));
 525                         }
 526                 }
 527
 528                 /* If both 32- and 64-bit addresses are valid (non-zero), they must match */
 529
 530                 if (address64->address && *address32 &&
 531                     (address64->address != (u64) * address32)) {
 532                         ACPI_ERROR((AE_INFO,
 533                                     "32/64X address mismatch in %s: %8.8X/%8.8X%8.8X, using 64X",
 534                                     name, *address32,
 535                                     ACPI_FORMAT_UINT64(address64->address)));
 536                 }
 537         }
 538 }
 539
 540 /******************************************************************************
 541  *
 542  * FUNCTION:    acpi_tb_setup_fadt_registers
 543  *
 544  * PARAMETERS:  None, uses acpi_gbl_FADT.
 545  *
 546  * RETURN:      None
 547  *
 548  * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
 549  *              force FADT register definitions to their default lengths.
 550  *
 551  ******************************************************************************/
 552
 553 static void acpi_tb_setup_fadt_registers(void)
 554 {
 555         struct acpi_generic_address *target64;
 556         struct acpi_generic_address *source64;
 557         u8 pm1_register_byte_width;
 558         u32 i;
 559
 560         /*
 561          * Optionally check all register lengths against the default values and
 562          * update them if they are incorrect.
 563          */
 564         if (acpi_gbl_use_default_register_widths) {
 565                 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 566                         target64 =
 567                             ACPI_ADD_PTR(struct acpi_generic_address,
 568                                          &acpi_gbl_FADT,
 569                                          fadt_info_table[i].address64);
 570
 571                         /*
 572                          * If a valid register (Address != 0) and the (default_length > 0)
 573                          * (Not a GPE register), then check the width against the default.
 574                          */
 575                         if ((target64->address) &&
 576                             (fadt_info_table[i].default_length > 0) &&
 577                             (fadt_info_table[i].default_length !=
 578                              target64->bit_width)) {
 579                                 ACPI_WARNING((AE_INFO,
 580                                               "Invalid length for %s: %d, using default %d",
 581                                               fadt_info_table[i].name,
 582                                               target64->bit_width,
 583                                               fadt_info_table[i].
 584                                               default_length));
 585
 586                                 /* Incorrect size, set width to the default */
 587
 588                                 target64->bit_width =
 589                                     fadt_info_table[i].default_length;
 590                         }
 591                 }
 592         }
 593
 594         /*
 595          * Get the length of the individual PM1 registers (enable and status).
 596          * Each register is defined to be (event block length / 2). Extra divide
 597          * by 8 converts bits to bytes.
 598          */
 599         pm1_register_byte_width =
 600             (u8)ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
 601
 602         /*
 603          * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
 604          * registers. These addresses do not appear (directly) in the FADT, so it
 605          * is useful to pre-calculate them from the PM1 Event Block definitions.
 606          *
 607          * The PM event blocks are split into two register blocks, first is the
 608          * PM Status Register block, followed immediately by the PM Enable
 609          * Register block. Each is of length (pm1_event_length/2)
 610          *
 611          * Note: The PM1A event block is required by the ACPI specification.
 612          * However, the PM1B event block is optional and is rarely, if ever,
 613          * used.
 614          */
 615
 616         for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
 617                 source64 =
 618                     ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
 619                                  fadt_pm_info_table[i].source);
 620
 621                 if (source64->address) {
 622                         acpi_tb_init_generic_address(fadt_pm_info_table[i].
 623                                                      target, source64->space_id,
 624                                                      pm1_register_byte_width,
 625                                                      source64->address +
 626                                                      (fadt_pm_info_table[i].
 627                                                       register_num *
 628                                                       pm1_register_byte_width));
 629                 }
 630         }
 631 }