kernel/drivers/acpi/acpica/tbfadt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbfadt   - FADT table utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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,
  56                              u64 address, char *register_name, u8 flags);
  57
  58 static void acpi_tb_convert_fadt(void);
  59
  60 static void acpi_tb_setup_fadt_registers(void);
  61
  62 static u64
  63 acpi_tb_select_address(char *register_name, u32 address32, u64 address64);
  64
  65 /* Table for conversion of FADT to common internal format and FADT validation */
  66
  67 typedef struct acpi_fadt_info {
  68         char *name;
  69         u16 address64;
  70         u16 address32;
  71         u16 length;
  72         u8 default_length;
  73         u8 flags;
  74
  75 } acpi_fadt_info;
  76
  77 #define ACPI_FADT_OPTIONAL          0
  78 #define ACPI_FADT_REQUIRED          1
  79 #define ACPI_FADT_SEPARATE_LENGTH   2
  80 #define ACPI_FADT_GPE_REGISTER      4
  81
  82 static struct acpi_fadt_info fadt_info_table[] = {
  83         {"Pm1aEventBlock",
  84          ACPI_FADT_OFFSET(xpm1a_event_block),
  85          ACPI_FADT_OFFSET(pm1a_event_block),
  86          ACPI_FADT_OFFSET(pm1_event_length),
  87          ACPI_PM1_REGISTER_WIDTH * 2,   /* Enable + Status register */
  88          ACPI_FADT_REQUIRED},
  89
  90         {"Pm1bEventBlock",
  91          ACPI_FADT_OFFSET(xpm1b_event_block),
  92          ACPI_FADT_OFFSET(pm1b_event_block),
  93          ACPI_FADT_OFFSET(pm1_event_length),
  94          ACPI_PM1_REGISTER_WIDTH * 2,   /* Enable + Status register */
  95          ACPI_FADT_OPTIONAL},
  96
  97         {"Pm1aControlBlock",
  98          ACPI_FADT_OFFSET(xpm1a_control_block),
  99          ACPI_FADT_OFFSET(pm1a_control_block),
 100          ACPI_FADT_OFFSET(pm1_control_length),
 101          ACPI_PM1_REGISTER_WIDTH,
 102          ACPI_FADT_REQUIRED},
 103
 104         {"Pm1bControlBlock",
 105          ACPI_FADT_OFFSET(xpm1b_control_block),
 106          ACPI_FADT_OFFSET(pm1b_control_block),
 107          ACPI_FADT_OFFSET(pm1_control_length),
 108          ACPI_PM1_REGISTER_WIDTH,
 109          ACPI_FADT_OPTIONAL},
 110
 111         {"Pm2ControlBlock",
 112          ACPI_FADT_OFFSET(xpm2_control_block),
 113          ACPI_FADT_OFFSET(pm2_control_block),
 114          ACPI_FADT_OFFSET(pm2_control_length),
 115          ACPI_PM2_REGISTER_WIDTH,
 116          ACPI_FADT_SEPARATE_LENGTH},
 117
 118         {"PmTimerBlock",
 119          ACPI_FADT_OFFSET(xpm_timer_block),
 120          ACPI_FADT_OFFSET(pm_timer_block),
 121          ACPI_FADT_OFFSET(pm_timer_length),
 122          ACPI_PM_TIMER_WIDTH,
 123          ACPI_FADT_SEPARATE_LENGTH},    /* ACPI 5.0A: Timer is optional */
 124
 125         {"Gpe0Block",
 126          ACPI_FADT_OFFSET(xgpe0_block),
 127          ACPI_FADT_OFFSET(gpe0_block),
 128          ACPI_FADT_OFFSET(gpe0_block_length),
 129          0,
 130          ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER},
 131
 132         {"Gpe1Block",
 133          ACPI_FADT_OFFSET(xgpe1_block),
 134          ACPI_FADT_OFFSET(gpe1_block),
 135          ACPI_FADT_OFFSET(gpe1_block_length),
 136          0,
 137          ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}
 138 };
 139
 140 #define ACPI_FADT_INFO_ENTRIES \
 141                         (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
 142
 143 /* Table used to split Event Blocks into separate status/enable registers */
 144
 145 typedef struct acpi_fadt_pm_info {
 146         struct acpi_generic_address *target;
 147         u16 source;
 148         u8 register_num;
 149
 150 } acpi_fadt_pm_info;
 151
 152 static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
 153         {&acpi_gbl_xpm1a_status,
 154          ACPI_FADT_OFFSET(xpm1a_event_block),
 155          0},
 156
 157         {&acpi_gbl_xpm1a_enable,
 158          ACPI_FADT_OFFSET(xpm1a_event_block),
 159          1},
 160
 161         {&acpi_gbl_xpm1b_status,
 162          ACPI_FADT_OFFSET(xpm1b_event_block),
 163          0},
 164
 165         {&acpi_gbl_xpm1b_enable,
 166          ACPI_FADT_OFFSET(xpm1b_event_block),
 167          1}
 168 };
 169
 170 #define ACPI_FADT_PM_INFO_ENTRIES \
 171                         (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
 172
 173 /*******************************************************************************
 174  *
 175  * FUNCTION:    acpi_tb_init_generic_address
 176  *
 177  * PARAMETERS:  generic_address     - GAS struct to be initialized
 178  *              space_id            - ACPI Space ID for this register
 179  *              byte_width          - Width of this register
 180  *              address             - Address of the register
 181  *              register_name       - ASCII name of the ACPI register
 182  *
 183  * RETURN:      None
 184  *
 185  * DESCRIPTION: Initialize a Generic Address Structure (GAS)
 186  *              See the ACPI specification for a full description and
 187  *              definition of this structure.
 188  *
 189  ******************************************************************************/
 190
 191 static void
 192 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
 193                              u8 space_id,
 194                              u8 byte_width,
 195                              u64 address, char *register_name, u8 flags)
 196 {
 197         u8 bit_width;
 198
 199         /*
 200          * Bit width field in the GAS is only one byte long, 255 max.
 201          * Check for bit_width overflow in GAS.
 202          */
 203         bit_width = (u8)(byte_width * 8);
 204         if (byte_width > 31) {  /* (31*8)=248, (32*8)=256 */
 205                 /*
 206                  * No error for GPE blocks, because we do not use the bit_width
 207                  * for GPEs, the legacy length (byte_width) is used instead to
 208                  * allow for a large number of GPEs.
 209                  */
 210                 if (!(flags & ACPI_FADT_GPE_REGISTER)) {
 211                         ACPI_ERROR((AE_INFO,
 212                                     "%s - 32-bit FADT register is too long (%u bytes, %u bits) "
 213                                     "to convert to GAS struct - 255 bits max, truncating",
 214                                     register_name, byte_width,
 215                                     (byte_width * 8)));
 216                 }
 217
 218                 bit_width = 255;
 219         }
 220
 221         /*
 222          * The 64-bit Address field is non-aligned in the byte packed
 223          * GAS struct.
 224          */
 225         ACPI_MOVE_64_TO_64(&generic_address->address, &address);
 226
 227         /* All other fields are byte-wide */
 228
 229         generic_address->space_id = space_id;
 230         generic_address->bit_width = bit_width;
 231         generic_address->bit_offset = 0;
 232         generic_address->access_width = 0;      /* Access width ANY */
 233 }
 234
 235 /*******************************************************************************
 236  *
 237  * FUNCTION:    acpi_tb_select_address
 238  *
 239  * PARAMETERS:  register_name       - ASCII name of the ACPI register
 240  *              address32           - 32-bit address of the register
 241  *              address64           - 64-bit address of the register
 242  *
 243  * RETURN:      The resolved 64-bit address
 244  *
 245  * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within
 246  *              the FADT. Used for the FACS and DSDT addresses.
 247  *
 248  * NOTES:
 249  *
 250  * Check for FACS and DSDT address mismatches. An address mismatch between
 251  * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
 252  * DSDT/X_DSDT) could be a corrupted address field or it might indicate
 253  * the presence of two FACS or two DSDT tables.
 254  *
 255  * November 2013:
 256  * By default, as per the ACPICA specification, a valid 64-bit address is
 257  * used regardless of the value of the 32-bit address. However, this
 258  * behavior can be overridden via the acpi_gbl_use32_bit_fadt_addresses flag.
 259  *
 260  ******************************************************************************/
 261
 262 static u64
 263 acpi_tb_select_address(char *register_name, u32 address32, u64 address64)
 264 {
 265
 266         if (!address64) {
 267
 268                 /* 64-bit address is zero, use 32-bit address */
 269
 270                 return ((u64)address32);
 271         }
 272
 273         if (address32 && (address64 != (u64)address32)) {
 274
 275                 /* Address mismatch between 32-bit and 64-bit versions */
 276
 277                 ACPI_BIOS_WARNING((AE_INFO,
 278                                    "32/64X %s address mismatch in FADT: "
 279                                    "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
 280                                    register_name, address32,
 281                                    ACPI_FORMAT_UINT64(address64),
 282                                    acpi_gbl_use32_bit_fadt_addresses ? 32 :
 283                                    64));
 284
 285                 /* 32-bit address override */
 286
 287                 if (acpi_gbl_use32_bit_fadt_addresses) {
 288                         return ((u64)address32);
 289                 }
 290         }
 291
 292         /* Default is to use the 64-bit address */
 293
 294         return (address64);
 295 }
 296
 297 /*******************************************************************************
 298  *
 299  * FUNCTION:    acpi_tb_parse_fadt
 300  *
 301  * PARAMETERS:  table_index         - Index for the FADT
 302  *
 303  * RETURN:      None
 304  *
 305  * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
 306  *              (FADT contains the addresses of the DSDT and FACS)
 307  *
 308  ******************************************************************************/
 309
 310 void acpi_tb_parse_fadt(u32 table_index)
 311 {
 312         u32 length;
 313         struct acpi_table_header *table;
 314
 315         /*
 316          * The FADT has multiple versions with different lengths,
 317          * and it contains pointers to both the DSDT and FACS tables.
 318          *
 319          * Get a local copy of the FADT and convert it to a common format
 320          * Map entire FADT, assumed to be smaller than one page.
 321          */
 322         length = acpi_gbl_root_table_list.tables[table_index].length;
 323
 324         table =
 325             acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
 326                                address, length);
 327         if (!table) {
 328                 return;
 329         }
 330
 331         /*
 332          * Validate the FADT checksum before we copy the table. Ignore
 333          * checksum error as we want to try to get the DSDT and FACS.
 334          */
 335         (void)acpi_tb_verify_checksum(table, length);
 336
 337         /* Create a local copy of the FADT in common ACPI 2.0+ format */
 338
 339         acpi_tb_create_local_fadt(table, length);
 340
 341         /* All done with the real FADT, unmap it */
 342
 343         acpi_os_unmap_memory(table, length);
 344
 345         /* Obtain the DSDT and FACS tables via their addresses within the FADT */
 346
 347         acpi_tb_install_fixed_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
 348                                     ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
 349
 350         /* If Hardware Reduced flag is set, there is no FACS */
 351
 352         if (!acpi_gbl_reduced_hardware) {
 353                 acpi_tb_install_fixed_table((acpi_physical_address)
 354                                             acpi_gbl_FADT.Xfacs, ACPI_SIG_FACS,
 355                                             ACPI_TABLE_INDEX_FACS);
 356         }
 357 }
 358
 359 /*******************************************************************************
 360  *
 361  * FUNCTION:    acpi_tb_create_local_fadt
 362  *
 363  * PARAMETERS:  table               - Pointer to BIOS FADT
 364  *              length              - Length of the table
 365  *
 366  * RETURN:      None
 367  *
 368  * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
 369  *              Performs validation on some important FADT fields.
 370  *
 371  * NOTE:        We create a local copy of the FADT regardless of the version.
 372  *
 373  ******************************************************************************/
 374
 375 void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
 376 {
 377         /*
 378          * Check if the FADT is larger than the largest table that we expect
 379          * (the ACPI 5.0 version). If so, truncate the table, and issue
 380          * a warning.
 381          */
 382         if (length > sizeof(struct acpi_table_fadt)) {
 383                 ACPI_BIOS_WARNING((AE_INFO,
 384                                    "FADT (revision %u) is longer than ACPI 5.0 version, "
 385                                    "truncating length %u to %u",
 386                                    table->revision, length,
 387                                    (u32)sizeof(struct acpi_table_fadt)));
 388         }
 389
 390         /* Clear the entire local FADT */
 391
 392         ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
 393
 394         /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
 395
 396         ACPI_MEMCPY(&acpi_gbl_FADT, table,
 397                     ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
 398
 399         /* Take a copy of the Hardware Reduced flag */
 400
 401         acpi_gbl_reduced_hardware = FALSE;
 402         if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
 403                 acpi_gbl_reduced_hardware = TRUE;
 404         }
 405
 406         /* Convert the local copy of the FADT to the common internal format */
 407
 408         acpi_tb_convert_fadt();
 409
 410         /* Initialize the global ACPI register structures */
 411
 412         acpi_tb_setup_fadt_registers();
 413 }
 414
 415 /*******************************************************************************
 416  *
 417  * FUNCTION:    acpi_tb_convert_fadt
 418  *
 419  * PARAMETERS:  none - acpi_gbl_FADT is used.
 420  *
 421  * RETURN:      None
 422  *
 423  * DESCRIPTION: Converts all versions of the FADT to a common internal format.
 424  *              Expand 32-bit addresses to 64-bit as necessary. Also validate
 425  *              important fields within the FADT.
 426  *
 427  * NOTE:        acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must
 428  *              contain a copy of the actual BIOS-provided FADT.
 429  *
 430  * Notes on 64-bit register addresses:
 431  *
 432  * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
 433  * fields of the FADT for all ACPI register addresses.
 434  *
 435  * The 64-bit X fields are optional extensions to the original 32-bit FADT
 436  * V1.0 fields. Even if they are present in the FADT, they are optional and
 437  * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
 438  * 32-bit V1.0 fields to the 64-bit X fields if the the 64-bit X field is
 439  * originally zero.
 440  *
 441  * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address
 442  * fields are expanded to the corresponding 64-bit X fields in the internal
 443  * common FADT.
 444  *
 445  * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
 446  * to the corresponding 64-bit X fields, if the 64-bit field is originally
 447  * zero. Adhering to the ACPI specification, we completely ignore the 32-bit
 448  * field if the 64-bit field is valid, regardless of whether the host OS is
 449  * 32-bit or 64-bit.
 450  *
 451  * Possible additional checks:
 452  *  (acpi_gbl_FADT.pm1_event_length >= 4)
 453  *  (acpi_gbl_FADT.pm1_control_length >= 2)
 454  *  (acpi_gbl_FADT.pm_timer_length >= 4)
 455  *  Gpe block lengths must be multiple of 2
 456  *
 457  ******************************************************************************/
 458
 459 static void acpi_tb_convert_fadt(void)
 460 {
 461         char *name;
 462         struct acpi_generic_address *address64;
 463         u32 address32;
 464         u8 length;
 465         u8 flags;
 466         u32 i;
 467
 468         /*
 469          * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
 470          * should be zero are indeed zero. This will workaround BIOSs that
 471          * inadvertently place values in these fields.
 472          *
 473          * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
 474          * at offset 45, 55, 95, and the word located at offset 109, 110.
 475          *
 476          * Note: The FADT revision value is unreliable. Only the length can be
 477          * trusted.
 478          */
 479         if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
 480                 acpi_gbl_FADT.preferred_profile = 0;
 481                 acpi_gbl_FADT.pstate_control = 0;
 482                 acpi_gbl_FADT.cst_control = 0;
 483                 acpi_gbl_FADT.boot_flags = 0;
 484         }
 485
 486         /*
 487          * Now we can update the local FADT length to the length of the
 488          * current FADT version as defined by the ACPI specification.
 489          * Thus, we will have a common FADT internally.
 490          */
 491         acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
 492
 493         /*
 494          * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
 495          * Later ACPICA code will always use the X 64-bit field.
 496          */
 497         acpi_gbl_FADT.Xfacs = acpi_tb_select_address("FACS",
 498                                                      acpi_gbl_FADT.facs,
 499                                                      acpi_gbl_FADT.Xfacs);
 500
 501         acpi_gbl_FADT.Xdsdt = acpi_tb_select_address("DSDT",
 502                                                      acpi_gbl_FADT.dsdt,
 503                                                      acpi_gbl_FADT.Xdsdt);
 504
 505         /* If Hardware Reduced flag is set, we are all done */
 506
 507         if (acpi_gbl_reduced_hardware) {
 508                 return;
 509         }
 510
 511         /* Examine all of the 64-bit extended address fields (X fields) */
 512
 513         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 514                 /*
 515                  * Get the 32-bit and 64-bit addresses, as well as the register
 516                  * length and register name.
 517                  */
 518                 address32 = *ACPI_ADD_PTR(u32,
 519                                           &acpi_gbl_FADT,
 520                                           fadt_info_table[i].address32);
 521
 522                 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
 523                                          &acpi_gbl_FADT,
 524                                          fadt_info_table[i].address64);
 525
 526                 length = *ACPI_ADD_PTR(u8,
 527                                        &acpi_gbl_FADT,
 528                                        fadt_info_table[i].length);
 529
 530                 name = fadt_info_table[i].name;
 531                 flags = fadt_info_table[i].flags;
 532
 533                 /*
 534                  * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
 535                  * generic address structures as necessary. Later code will always use
 536                  * the 64-bit address structures.
 537                  *
 538                  * November 2013:
 539                  * Now always use the 64-bit address if it is valid (non-zero), in
 540                  * accordance with the ACPI specification which states that a 64-bit
 541                  * address supersedes the 32-bit version. This behavior can be
 542                  * overridden by the acpi_gbl_use32_bit_fadt_addresses flag.
 543                  *
 544                  * During 64-bit address construction and verification,
 545                  * these cases are handled:
 546                  *
 547                  * Address32 zero, Address64 [don't care]   - Use Address64
 548                  *
 549                  * Address32 non-zero, Address64 zero       - Copy/use Address32
 550                  * Address32 non-zero == Address64 non-zero - Use Address64
 551                  * Address32 non-zero != Address64 non-zero - Warning, use Address64
 552                  *
 553                  * Override: if acpi_gbl_use32_bit_fadt_addresses is TRUE, and:
 554                  * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32
 555                  *
 556                  * Note: space_id is always I/O for 32-bit legacy address fields
 557                  */
 558                 if (address32) {
 559                         if (!address64->address) {
 560
 561                                 /* 64-bit address is zero, use 32-bit address */
 562
 563                                 acpi_tb_init_generic_address(address64,
 564                                                              ACPI_ADR_SPACE_SYSTEM_IO,
 565                                                              *ACPI_ADD_PTR(u8,
 566                                                                            &acpi_gbl_FADT,
 567                                                                            fadt_info_table
 568                                                                            [i].
 569                                                                            length),
 570                                                              (u64)address32,
 571                                                              name, flags);
 572                         } else if (address64->address != (u64)address32) {
 573
 574                                 /* Address mismatch */
 575
 576                                 ACPI_BIOS_WARNING((AE_INFO,
 577                                                    "32/64X address mismatch in FADT/%s: "
 578                                                    "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
 579                                                    name, address32,
 580                                                    ACPI_FORMAT_UINT64
 581                                                    (address64->address),
 582                                                    acpi_gbl_use32_bit_fadt_addresses
 583                                                    ? 32 : 64));
 584
 585                                 if (acpi_gbl_use32_bit_fadt_addresses) {
 586
 587                                         /* 32-bit address override */
 588
 589                                         acpi_tb_init_generic_address(address64,
 590                                                                      ACPI_ADR_SPACE_SYSTEM_IO,
 591                                                                      *ACPI_ADD_PTR
 592                                                                      (u8,
 593                                                                       &acpi_gbl_FADT,
 594                                                                       fadt_info_table
 595                                                                       [i].
 596                                                                       length),
 597                                                                      (u64)
 598                                                                      address32,
 599                                                                      name,
 600                                                                      flags);
 601                                 }
 602                         }
 603                 }
 604
 605                 /*
 606                  * For each extended field, check for length mismatch between the
 607                  * legacy length field and the corresponding 64-bit X length field.
 608                  * Note: If the legacy length field is > 0xFF bits, ignore this
 609                  * check. (GPE registers can be larger than the 64-bit GAS structure
 610                  * can accomodate, 0xFF bits).
 611                  */
 612                 if (address64->address &&
 613                     (ACPI_MUL_8(length) <= ACPI_UINT8_MAX) &&
 614                     (address64->bit_width != ACPI_MUL_8(length))) {
 615                         ACPI_BIOS_WARNING((AE_INFO,
 616                                            "32/64X length mismatch in FADT/%s: %u/%u",
 617                                            name, ACPI_MUL_8(length),
 618                                            address64->bit_width));
 619                 }
 620
 621                 if (fadt_info_table[i].flags & ACPI_FADT_REQUIRED) {
 622                         /*
 623                          * Field is required (Pm1a_event, Pm1a_control).
 624                          * Both the address and length must be non-zero.
 625                          */
 626                         if (!address64->address || !length) {
 627                                 ACPI_BIOS_ERROR((AE_INFO,
 628                                                  "Required FADT field %s has zero address and/or length: "
 629                                                  "0x%8.8X%8.8X/0x%X",
 630                                                  name,
 631                                                  ACPI_FORMAT_UINT64(address64->
 632                                                                     address),
 633                                                  length));
 634                         }
 635                 } else if (fadt_info_table[i].flags & ACPI_FADT_SEPARATE_LENGTH) {
 636                         /*
 637                          * Field is optional (Pm2_control, GPE0, GPE1) AND has its own
 638                          * length field. If present, both the address and length must
 639                          * be valid.
 640                          */
 641                         if ((address64->address && !length) ||
 642                             (!address64->address && length)) {
 643                                 ACPI_BIOS_WARNING((AE_INFO,
 644                                                    "Optional FADT field %s has zero address or length: "
 645                                                    "0x%8.8X%8.8X/0x%X",
 646                                                    name,
 647                                                    ACPI_FORMAT_UINT64
 648                                                    (address64->address),
 649                                                    length));
 650                         }
 651                 }
 652         }
 653 }
 654
 655 /*******************************************************************************
 656  *
 657  * FUNCTION:    acpi_tb_setup_fadt_registers
 658  *
 659  * PARAMETERS:  None, uses acpi_gbl_FADT.
 660  *
 661  * RETURN:      None
 662  *
 663  * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
 664  *              force FADT register definitions to their default lengths.
 665  *
 666  ******************************************************************************/
 667
 668 static void acpi_tb_setup_fadt_registers(void)
 669 {
 670         struct acpi_generic_address *target64;
 671         struct acpi_generic_address *source64;
 672         u8 pm1_register_byte_width;
 673         u32 i;
 674
 675         /*
 676          * Optionally check all register lengths against the default values and
 677          * update them if they are incorrect.
 678          */
 679         if (acpi_gbl_use_default_register_widths) {
 680                 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 681                         target64 =
 682                             ACPI_ADD_PTR(struct acpi_generic_address,
 683                                          &acpi_gbl_FADT,
 684                                          fadt_info_table[i].address64);
 685
 686                         /*
 687                          * If a valid register (Address != 0) and the (default_length > 0)
 688                          * (Not a GPE register), then check the width against the default.
 689                          */
 690                         if ((target64->address) &&
 691                             (fadt_info_table[i].default_length > 0) &&
 692                             (fadt_info_table[i].default_length !=
 693                              target64->bit_width)) {
 694                                 ACPI_BIOS_WARNING((AE_INFO,
 695                                                    "Invalid length for FADT/%s: %u, using default %u",
 696                                                    fadt_info_table[i].name,
 697                                                    target64->bit_width,
 698                                                    fadt_info_table[i].
 699                                                    default_length));
 700
 701                                 /* Incorrect size, set width to the default */
 702
 703                                 target64->bit_width =
 704                                     fadt_info_table[i].default_length;
 705                         }
 706                 }
 707         }
 708
 709         /*
 710          * Get the length of the individual PM1 registers (enable and status).
 711          * Each register is defined to be (event block length / 2). Extra divide
 712          * by 8 converts bits to bytes.
 713          */
 714         pm1_register_byte_width = (u8)
 715             ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
 716
 717         /*
 718          * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
 719          * registers. These addresses do not appear (directly) in the FADT, so it
 720          * is useful to pre-calculate them from the PM1 Event Block definitions.
 721          *
 722          * The PM event blocks are split into two register blocks, first is the
 723          * PM Status Register block, followed immediately by the PM Enable
 724          * Register block. Each is of length (pm1_event_length/2)
 725          *
 726          * Note: The PM1A event block is required by the ACPI specification.
 727          * However, the PM1B event block is optional and is rarely, if ever,
 728          * used.
 729          */
 730
 731         for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
 732                 source64 =
 733                     ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
 734                                  fadt_pm_info_table[i].source);
 735
 736                 if (source64->address) {
 737                         acpi_tb_init_generic_address(fadt_pm_info_table[i].
 738                                                      target, source64->space_id,
 739                                                      pm1_register_byte_width,
 740                                                      source64->address +
 741                                                      (fadt_pm_info_table[i].
 742                                                       register_num *
 743                                                       pm1_register_byte_width),
 744                                                      "PmRegisters", 0);
 745                 }
 746         }
 747 }