drivers/acpi/acpica/tbfadt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbfadt   - FADT table utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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 void
  53 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
  54                              u8 space_id,
  55                              u8 byte_width, u64 address, char *register_name);
  56
  57 static void acpi_tb_convert_fadt(void);
  58
  59 static void acpi_tb_validate_fadt(void);
  60
  61 static void acpi_tb_setup_fadt_registers(void);
  62
  63 /* Table for conversion of FADT to common internal format and FADT validation */
  64
  65 typedef struct acpi_fadt_info {
  66         char *name;
  67         u16 address64;
  68         u16 address32;
  69         u16 length;
  70         u8 default_length;
  71         u8 type;
  72
  73 } acpi_fadt_info;
  74
  75 #define ACPI_FADT_OPTIONAL          0
  76 #define ACPI_FADT_REQUIRED          1
  77 #define ACPI_FADT_SEPARATE_LENGTH   2
  78
  79 static struct acpi_fadt_info fadt_info_table[] = {
  80         {"Pm1aEventBlock",
  81          ACPI_FADT_OFFSET(xpm1a_event_block),
  82          ACPI_FADT_OFFSET(pm1a_event_block),
  83          ACPI_FADT_OFFSET(pm1_event_length),
  84          ACPI_PM1_REGISTER_WIDTH * 2,   /* Enable + Status register */
  85          ACPI_FADT_REQUIRED},
  86
  87         {"Pm1bEventBlock",
  88          ACPI_FADT_OFFSET(xpm1b_event_block),
  89          ACPI_FADT_OFFSET(pm1b_event_block),
  90          ACPI_FADT_OFFSET(pm1_event_length),
  91          ACPI_PM1_REGISTER_WIDTH * 2,   /* Enable + Status register */
  92          ACPI_FADT_OPTIONAL},
  93
  94         {"Pm1aControlBlock",
  95          ACPI_FADT_OFFSET(xpm1a_control_block),
  96          ACPI_FADT_OFFSET(pm1a_control_block),
  97          ACPI_FADT_OFFSET(pm1_control_length),
  98          ACPI_PM1_REGISTER_WIDTH,
  99          ACPI_FADT_REQUIRED},
 100
 101         {"Pm1bControlBlock",
 102          ACPI_FADT_OFFSET(xpm1b_control_block),
 103          ACPI_FADT_OFFSET(pm1b_control_block),
 104          ACPI_FADT_OFFSET(pm1_control_length),
 105          ACPI_PM1_REGISTER_WIDTH,
 106          ACPI_FADT_OPTIONAL},
 107
 108         {"Pm2ControlBlock",
 109          ACPI_FADT_OFFSET(xpm2_control_block),
 110          ACPI_FADT_OFFSET(pm2_control_block),
 111          ACPI_FADT_OFFSET(pm2_control_length),
 112          ACPI_PM2_REGISTER_WIDTH,
 113          ACPI_FADT_SEPARATE_LENGTH},
 114
 115         {"PmTimerBlock",
 116          ACPI_FADT_OFFSET(xpm_timer_block),
 117          ACPI_FADT_OFFSET(pm_timer_block),
 118          ACPI_FADT_OFFSET(pm_timer_length),
 119          ACPI_PM_TIMER_WIDTH,
 120          ACPI_FADT_SEPARATE_LENGTH},    /* ACPI 5.0A: Timer is optional */
 121
 122         {"Gpe0Block",
 123          ACPI_FADT_OFFSET(xgpe0_block),
 124          ACPI_FADT_OFFSET(gpe0_block),
 125          ACPI_FADT_OFFSET(gpe0_block_length),
 126          0,
 127          ACPI_FADT_SEPARATE_LENGTH},
 128
 129         {"Gpe1Block",
 130          ACPI_FADT_OFFSET(xgpe1_block),
 131          ACPI_FADT_OFFSET(gpe1_block),
 132          ACPI_FADT_OFFSET(gpe1_block_length),
 133          0,
 134          ACPI_FADT_SEPARATE_LENGTH}
 135 };
 136
 137 #define ACPI_FADT_INFO_ENTRIES \
 138                         (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
 139
 140 /* Table used to split Event Blocks into separate status/enable registers */
 141
 142 typedef struct acpi_fadt_pm_info {
 143         struct acpi_generic_address *target;
 144         u16 source;
 145         u8 register_num;
 146
 147 } acpi_fadt_pm_info;
 148
 149 static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
 150         {&acpi_gbl_xpm1a_status,
 151          ACPI_FADT_OFFSET(xpm1a_event_block),
 152          0},
 153
 154         {&acpi_gbl_xpm1a_enable,
 155          ACPI_FADT_OFFSET(xpm1a_event_block),
 156          1},
 157
 158         {&acpi_gbl_xpm1b_status,
 159          ACPI_FADT_OFFSET(xpm1b_event_block),
 160          0},
 161
 162         {&acpi_gbl_xpm1b_enable,
 163          ACPI_FADT_OFFSET(xpm1b_event_block),
 164          1}
 165 };
 166
 167 #define ACPI_FADT_PM_INFO_ENTRIES \
 168                         (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
 169
 170 /*******************************************************************************
 171  *
 172  * FUNCTION:    acpi_tb_init_generic_address
 173  *
 174  * PARAMETERS:  generic_address     - GAS struct to be initialized
 175  *              space_id            - ACPI Space ID for this register
 176  *              byte_width          - Width of this register
 177  *              address             - Address of the register
 178  *
 179  * RETURN:      None
 180  *
 181  * DESCRIPTION: Initialize a Generic Address Structure (GAS)
 182  *              See the ACPI specification for a full description and
 183  *              definition of this structure.
 184  *
 185  ******************************************************************************/
 186
 187 static void
 188 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
 189                              u8 space_id,
 190                              u8 byte_width, u64 address, char *register_name)
 191 {
 192         u8 bit_width;
 193
 194         /* Bit width field in the GAS is only one byte long, 255 max */
 195
 196         bit_width = (u8)(byte_width * 8);
 197
 198         if (byte_width > 31) {  /* (31*8)=248 */
 199                 ACPI_ERROR((AE_INFO,
 200                             "%s - 32-bit FADT register is too long (%u bytes, %u bits) "
 201                             "to convert to GAS struct - 255 bits max, truncating",
 202                             register_name, byte_width, (byte_width * 8)));
 203
 204                 bit_width = 255;
 205         }
 206
 207         /*
 208          * The 64-bit Address field is non-aligned in the byte packed
 209          * GAS struct.
 210          */
 211         ACPI_MOVE_64_TO_64(&generic_address->address, &address);
 212
 213         /* All other fields are byte-wide */
 214
 215         generic_address->space_id = space_id;
 216         generic_address->bit_width = bit_width;
 217         generic_address->bit_offset = 0;
 218         generic_address->access_width = 0;      /* Access width ANY */
 219 }
 220
 221 /*******************************************************************************
 222  *
 223  * FUNCTION:    acpi_tb_parse_fadt
 224  *
 225  * PARAMETERS:  table_index         - Index for the FADT
 226  *
 227  * RETURN:      None
 228  *
 229  * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
 230  *              (FADT contains the addresses of the DSDT and FACS)
 231  *
 232  ******************************************************************************/
 233
 234 void acpi_tb_parse_fadt(u32 table_index)
 235 {
 236         u32 length;
 237         struct acpi_table_header *table;
 238
 239         /*
 240          * The FADT has multiple versions with different lengths,
 241          * and it contains pointers to both the DSDT and FACS tables.
 242          *
 243          * Get a local copy of the FADT and convert it to a common format
 244          * Map entire FADT, assumed to be smaller than one page.
 245          */
 246         length = acpi_gbl_root_table_list.tables[table_index].length;
 247
 248         table =
 249             acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
 250                                address, length);
 251         if (!table) {
 252                 return;
 253         }
 254
 255         /*
 256          * Validate the FADT checksum before we copy the table. Ignore
 257          * checksum error as we want to try to get the DSDT and FACS.
 258          */
 259         (void)acpi_tb_verify_checksum(table, length);
 260
 261         /* Create a local copy of the FADT in common ACPI 2.0+ format */
 262
 263         acpi_tb_create_local_fadt(table, length);
 264
 265         /* All done with the real FADT, unmap it */
 266
 267         acpi_os_unmap_memory(table, length);
 268
 269         /* Obtain the DSDT and FACS tables via their addresses within the FADT */
 270
 271         acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
 272                               ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
 273
 274         /* If Hardware Reduced flag is set, there is no FACS */
 275
 276         if (!acpi_gbl_reduced_hardware) {
 277                 acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.
 278                                       Xfacs, ACPI_SIG_FACS,
 279                                       ACPI_TABLE_INDEX_FACS);
 280         }
 281 }
 282
 283 /*******************************************************************************
 284  *
 285  * FUNCTION:    acpi_tb_create_local_fadt
 286  *
 287  * PARAMETERS:  table               - Pointer to BIOS FADT
 288  *              length              - Length of the table
 289  *
 290  * RETURN:      None
 291  *
 292  * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
 293  *              Performs validation on some important FADT fields.
 294  *
 295  * NOTE:        We create a local copy of the FADT regardless of the version.
 296  *
 297  ******************************************************************************/
 298
 299 void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
 300 {
 301         /*
 302          * Check if the FADT is larger than the largest table that we expect
 303          * (the ACPI 5.0 version). If so, truncate the table, and issue
 304          * a warning.
 305          */
 306         if (length > sizeof(struct acpi_table_fadt)) {
 307                 ACPI_BIOS_WARNING((AE_INFO,
 308                                    "FADT (revision %u) is longer than ACPI 5.0 version, "
 309                                    "truncating length %u to %u",
 310                                    table->revision, length,
 311                                    (u32)sizeof(struct acpi_table_fadt)));
 312         }
 313
 314         /* Clear the entire local FADT */
 315
 316         ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
 317
 318         /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
 319
 320         ACPI_MEMCPY(&acpi_gbl_FADT, table,
 321                     ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
 322
 323         /* Take a copy of the Hardware Reduced flag */
 324
 325         acpi_gbl_reduced_hardware = FALSE;
 326         if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
 327                 acpi_gbl_reduced_hardware = TRUE;
 328         }
 329
 330         /* Convert the local copy of the FADT to the common internal format */
 331
 332         acpi_tb_convert_fadt();
 333
 334         /* Validate FADT values now, before we make any changes */
 335
 336         acpi_tb_validate_fadt();
 337
 338         /* Initialize the global ACPI register structures */
 339
 340         acpi_tb_setup_fadt_registers();
 341 }
 342
 343 /*******************************************************************************
 344  *
 345  * FUNCTION:    acpi_tb_convert_fadt
 346  *
 347  * PARAMETERS:  None, uses acpi_gbl_FADT
 348  *
 349  * RETURN:      None
 350  *
 351  * DESCRIPTION: Converts all versions of the FADT to a common internal format.
 352  *              Expand 32-bit addresses to 64-bit as necessary.
 353  *
 354  * NOTE:        acpi_gbl_FADT must be of size (struct acpi_table_fadt),
 355  *              and must contain a copy of the actual FADT.
 356  *
 357  * Notes on 64-bit register addresses:
 358  *
 359  * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
 360  * fields of the FADT for all ACPI register addresses.
 361  *
 362  * The 64-bit "X" fields are optional extensions to the original 32-bit FADT
 363  * V1.0 fields. Even if they are present in the FADT, they are optional and
 364  * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
 365  * 32-bit V1.0 fields if the corresponding X field is zero.
 366  *
 367  * For ACPI 1.0 FADTs, all 32-bit address fields are expanded to the
 368  * corresponding "X" fields in the internal FADT.
 369  *
 370  * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
 371  * to the corresponding 64-bit X fields. For compatibility with other ACPI
 372  * implementations, we ignore the 64-bit field if the 32-bit field is valid,
 373  * regardless of whether the host OS is 32-bit or 64-bit.
 374  *
 375  ******************************************************************************/
 376
 377 static void acpi_tb_convert_fadt(void)
 378 {
 379         struct acpi_generic_address *address64;
 380         u32 address32;
 381         u32 i;
 382
 383         /*
 384          * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
 385          * Later code will always use the X 64-bit field. Also, check for an
 386          * address mismatch between the 32-bit and 64-bit address fields
 387          * (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate
 388          * the presence of two FACS or two DSDT tables.
 389          */
 390         if (!acpi_gbl_FADT.Xfacs) {
 391                 acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
 392         } else if (acpi_gbl_FADT.facs &&
 393                    (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
 394                 ACPI_WARNING((AE_INFO,
 395                     "32/64 FACS address mismatch in FADT - two FACS tables!"));
 396         }
 397
 398         if (!acpi_gbl_FADT.Xdsdt) {
 399                 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
 400         } else if (acpi_gbl_FADT.dsdt &&
 401                    (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
 402                 ACPI_WARNING((AE_INFO,
 403                     "32/64 DSDT address mismatch in FADT - two DSDT tables!"));
 404         }
 405
 406         /*
 407          * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
 408          * should be zero are indeed zero. This will workaround BIOSs that
 409          * inadvertently place values in these fields.
 410          *
 411          * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
 412          * at offset 45, 55, 95, and the word located at offset 109, 110.
 413          *
 414          * Note: The FADT revision value is unreliable. Only the length can be
 415          * trusted.
 416          */
 417         if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
 418                 acpi_gbl_FADT.preferred_profile = 0;
 419                 acpi_gbl_FADT.pstate_control = 0;
 420                 acpi_gbl_FADT.cst_control = 0;
 421                 acpi_gbl_FADT.boot_flags = 0;
 422         }
 423
 424         /* Update the local FADT table header length */
 425
 426         acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
 427
 428         /*
 429          * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
 430          * generic address structures as necessary. Later code will always use
 431          * the 64-bit address structures.
 432          *
 433          * March 2009:
 434          * We now always use the 32-bit address if it is valid (non-null). This
 435          * is not in accordance with the ACPI specification which states that
 436          * the 64-bit address supersedes the 32-bit version, but we do this for
 437          * compatibility with other ACPI implementations. Most notably, in the
 438          * case where both the 32 and 64 versions are non-null, we use the 32-bit
 439          * version. This is the only address that is guaranteed to have been
 440          * tested by the BIOS manufacturer.
 441          */
 442         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 443                 address32 = *ACPI_ADD_PTR(u32,
 444                                           &acpi_gbl_FADT,
 445                                           fadt_info_table[i].address32);
 446
 447                 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
 448                                          &acpi_gbl_FADT,
 449                                          fadt_info_table[i].address64);
 450
 451                 /*
 452                  * If both 32- and 64-bit addresses are valid (non-zero),
 453                  * they must match.
 454                  */
 455                 if (address64->address && address32 &&
 456                     (address64->address != (u64)address32)) {
 457                         ACPI_BIOS_ERROR((AE_INFO,
 458                                          "32/64X address mismatch in FADT/%s: "
 459                                          "0x%8.8X/0x%8.8X%8.8X, using 32",
 460                                          fadt_info_table[i].name, address32,
 461                                          ACPI_FORMAT_UINT64(address64->
 462                                                             address)));
 463                 }
 464
 465                 /* Always use 32-bit address if it is valid (non-null) */
 466
 467                 if (address32) {
 468                         /*
 469                          * Copy the 32-bit address to the 64-bit GAS structure. The
 470                          * Space ID is always I/O for 32-bit legacy address fields
 471                         */
 472                         acpi_tb_init_generic_address(address64,
 473                                                      ACPI_ADR_SPACE_SYSTEM_IO,
 474                                                      *ACPI_ADD_PTR(u8,
 475                                                                    &acpi_gbl_FADT,
 476                                                                    fadt_info_table
 477                                                                    [i].length),
 478                                                      (u64) address32,
 479                                                      fadt_info_table[i].name);
 480                 }
 481         }
 482 }
 483
 484 /*******************************************************************************
 485  *
 486  * FUNCTION:    acpi_tb_validate_fadt
 487  *
 488  * PARAMETERS:  table           - Pointer to the FADT to be validated
 489  *
 490  * RETURN:      None
 491  *
 492  * DESCRIPTION: Validate various important fields within the FADT. If a problem
 493  *              is found, issue a message, but no status is returned.
 494  *              Used by both the table manager and the disassembler.
 495  *
 496  * Possible additional checks:
 497  * (acpi_gbl_FADT.pm1_event_length >= 4)
 498  * (acpi_gbl_FADT.pm1_control_length >= 2)
 499  * (acpi_gbl_FADT.pm_timer_length >= 4)
 500  * Gpe block lengths must be multiple of 2
 501  *
 502  ******************************************************************************/
 503
 504 static void acpi_tb_validate_fadt(void)
 505 {
 506         char *name;
 507         struct acpi_generic_address *address64;
 508         u8 length;
 509         u32 i;
 510
 511         /*
 512          * Check for FACS and DSDT address mismatches. An address mismatch between
 513          * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
 514          * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
 515          */
 516         if (acpi_gbl_FADT.facs &&
 517             (acpi_gbl_FADT.Xfacs != (u64)acpi_gbl_FADT.facs)) {
 518                 ACPI_BIOS_WARNING((AE_INFO,
 519                                    "32/64X FACS address mismatch in FADT - "
 520                                    "0x%8.8X/0x%8.8X%8.8X, using 32",
 521                                    acpi_gbl_FADT.facs,
 522                                    ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs)));
 523
 524                 acpi_gbl_FADT.Xfacs = (u64)acpi_gbl_FADT.facs;
 525         }
 526
 527         if (acpi_gbl_FADT.dsdt &&
 528             (acpi_gbl_FADT.Xdsdt != (u64)acpi_gbl_FADT.dsdt)) {
 529                 ACPI_BIOS_WARNING((AE_INFO,
 530                                    "32/64X DSDT address mismatch in FADT - "
 531                                    "0x%8.8X/0x%8.8X%8.8X, using 32",
 532                                    acpi_gbl_FADT.dsdt,
 533                                    ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt)));
 534
 535                 acpi_gbl_FADT.Xdsdt = (u64)acpi_gbl_FADT.dsdt;
 536         }
 537
 538         /* If Hardware Reduced flag is set, we are all done */
 539
 540         if (acpi_gbl_reduced_hardware) {
 541                 return;
 542         }
 543
 544         /* Examine all of the 64-bit extended address fields (X fields) */
 545
 546         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 547                 /*
 548                  * Generate pointer to the 64-bit address, get the register
 549                  * length (width) and the register name
 550                  */
 551                 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
 552                                          &acpi_gbl_FADT,
 553                                          fadt_info_table[i].address64);
 554                 length =
 555                     *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
 556                                   fadt_info_table[i].length);
 557                 name = fadt_info_table[i].name;
 558
 559                 /*
 560                  * For each extended field, check for length mismatch between the
 561                  * legacy length field and the corresponding 64-bit X length field.
 562                  * Note: If the legacy length field is > 0xFF bits, ignore this
 563                  * check. (GPE registers can be larger than the 64-bit GAS structure
 564                  * can accomodate, 0xFF bits).
 565                  */
 566                 if (address64->address &&
 567                     (ACPI_MUL_8(length) <= ACPI_UINT8_MAX) &&
 568                     (address64->bit_width != ACPI_MUL_8(length))) {
 569                         ACPI_BIOS_WARNING((AE_INFO,
 570                                            "32/64X length mismatch in FADT/%s: %u/%u",
 571                                            name, ACPI_MUL_8(length),
 572                                            address64->bit_width));
 573                 }
 574
 575                 if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
 576                         /*
 577                          * Field is required (Pm1a_event, Pm1a_control).
 578                          * Both the address and length must be non-zero.
 579                          */
 580                         if (!address64->address || !length) {
 581                                 ACPI_BIOS_ERROR((AE_INFO,
 582                                                  "Required FADT field %s has zero address and/or length: "
 583                                                  "0x%8.8X%8.8X/0x%X",
 584                                                  name,
 585                                                  ACPI_FORMAT_UINT64(address64->
 586                                                                     address),
 587                                                  length));
 588                         }
 589                 } else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
 590                         /*
 591                          * Field is optional (Pm2_control, GPE0, GPE1) AND has its own
 592                          * length field. If present, both the address and length must
 593                          * be valid.
 594                          */
 595                         if ((address64->address && !length) ||
 596                             (!address64->address && length)) {
 597                                 ACPI_BIOS_WARNING((AE_INFO,
 598                                                    "Optional FADT field %s has zero address or length: "
 599                                                    "0x%8.8X%8.8X/0x%X",
 600                                                    name,
 601                                                    ACPI_FORMAT_UINT64
 602                                                    (address64->address),
 603                                                    length));
 604                         }
 605                 }
 606         }
 607 }
 608
 609 /*******************************************************************************
 610  *
 611  * FUNCTION:    acpi_tb_setup_fadt_registers
 612  *
 613  * PARAMETERS:  None, uses acpi_gbl_FADT.
 614  *
 615  * RETURN:      None
 616  *
 617  * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
 618  *              force FADT register definitions to their default lengths.
 619  *
 620  ******************************************************************************/
 621
 622 static void acpi_tb_setup_fadt_registers(void)
 623 {
 624         struct acpi_generic_address *target64;
 625         struct acpi_generic_address *source64;
 626         u8 pm1_register_byte_width;
 627         u32 i;
 628
 629         /*
 630          * Optionally check all register lengths against the default values and
 631          * update them if they are incorrect.
 632          */
 633         if (acpi_gbl_use_default_register_widths) {
 634                 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 635                         target64 =
 636                             ACPI_ADD_PTR(struct acpi_generic_address,
 637                                          &acpi_gbl_FADT,
 638                                          fadt_info_table[i].address64);
 639
 640                         /*
 641                          * If a valid register (Address != 0) and the (default_length > 0)
 642                          * (Not a GPE register), then check the width against the default.
 643                          */
 644                         if ((target64->address) &&
 645                             (fadt_info_table[i].default_length > 0) &&
 646                             (fadt_info_table[i].default_length !=
 647                              target64->bit_width)) {
 648                                 ACPI_BIOS_WARNING((AE_INFO,
 649                                                    "Invalid length for FADT/%s: %u, using default %u",
 650                                                    fadt_info_table[i].name,
 651                                                    target64->bit_width,
 652                                                    fadt_info_table[i].
 653                                                    default_length));
 654
 655                                 /* Incorrect size, set width to the default */
 656
 657                                 target64->bit_width =
 658                                     fadt_info_table[i].default_length;
 659                         }
 660                 }
 661         }
 662
 663         /*
 664          * Get the length of the individual PM1 registers (enable and status).
 665          * Each register is defined to be (event block length / 2). Extra divide
 666          * by 8 converts bits to bytes.
 667          */
 668         pm1_register_byte_width = (u8)
 669             ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
 670
 671         /*
 672          * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
 673          * registers. These addresses do not appear (directly) in the FADT, so it
 674          * is useful to pre-calculate them from the PM1 Event Block definitions.
 675          *
 676          * The PM event blocks are split into two register blocks, first is the
 677          * PM Status Register block, followed immediately by the PM Enable
 678          * Register block. Each is of length (pm1_event_length/2)
 679          *
 680          * Note: The PM1A event block is required by the ACPI specification.
 681          * However, the PM1B event block is optional and is rarely, if ever,
 682          * used.
 683          */
 684
 685         for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
 686                 source64 =
 687                     ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
 688                                  fadt_pm_info_table[i].source);
 689
 690                 if (source64->address) {
 691                         acpi_tb_init_generic_address(fadt_pm_info_table[i].
 692                                                      target, source64->space_id,
 693                                                      pm1_register_byte_width,
 694                                                      source64->address +
 695                                                      (fadt_pm_info_table[i].
 696                                                       register_num *
 697                                                       pm1_register_byte_width),
 698                                                      "PmRegisters");
 699                 }
 700         }
 701 }