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:  None
 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(void)
 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[acpi_gbl_fadt_index].length;
 323
 324         table =
 325             acpi_os_map_memory(acpi_gbl_root_table_list.
 326                                tables[acpi_gbl_fadt_index].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_gbl_dsdt_index);
 349
 350         /* If Hardware Reduced flag is set, there is no FACS */
 351
 352         if (!acpi_gbl_reduced_hardware) {
 353                 if (acpi_gbl_FADT.facs) {
 354                         acpi_tb_install_fixed_table((acpi_physical_address)
 355                                                     acpi_gbl_FADT.facs,
 356                                                     ACPI_SIG_FACS,
 357                                                     &acpi_gbl_facs_index);
 358                 }
 359                 if (acpi_gbl_FADT.Xfacs) {
 360                         acpi_tb_install_fixed_table((acpi_physical_address)
 361                                                     acpi_gbl_FADT.Xfacs,
 362                                                     ACPI_SIG_FACS,
 363                                                     &acpi_gbl_xfacs_index);
 364                 }
 365         }
 366 }
 367
 368 /*******************************************************************************
 369  *
 370  * FUNCTION:    acpi_tb_create_local_fadt
 371  *
 372  * PARAMETERS:  table               - Pointer to BIOS FADT
 373  *              length              - Length of the table
 374  *
 375  * RETURN:      None
 376  *
 377  * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
 378  *              Performs validation on some important FADT fields.
 379  *
 380  * NOTE:        We create a local copy of the FADT regardless of the version.
 381  *
 382  ******************************************************************************/
 383
 384 void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
 385 {
 386         /*
 387          * Check if the FADT is larger than the largest table that we expect
 388          * (the ACPI 5.0 version). If so, truncate the table, and issue
 389          * a warning.
 390          */
 391         if (length > sizeof(struct acpi_table_fadt)) {
 392                 ACPI_BIOS_WARNING((AE_INFO,
 393                                    "FADT (revision %u) is longer than ACPI 5.0 version, "
 394                                    "truncating length %u to %u",
 395                                    table->revision, length,
 396                                    (u32)sizeof(struct acpi_table_fadt)));
 397         }
 398
 399         /* Clear the entire local FADT */
 400
 401         memset(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
 402
 403         /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
 404
 405         memcpy(&acpi_gbl_FADT, table,
 406                ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
 407
 408         /* Take a copy of the Hardware Reduced flag */
 409
 410         acpi_gbl_reduced_hardware = FALSE;
 411         if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
 412                 acpi_gbl_reduced_hardware = TRUE;
 413         }
 414
 415         /* Convert the local copy of the FADT to the common internal format */
 416
 417         acpi_tb_convert_fadt();
 418
 419         /* Initialize the global ACPI register structures */
 420
 421         acpi_tb_setup_fadt_registers();
 422 }
 423
 424 /*******************************************************************************
 425  *
 426  * FUNCTION:    acpi_tb_convert_fadt
 427  *
 428  * PARAMETERS:  none - acpi_gbl_FADT is used.
 429  *
 430  * RETURN:      None
 431  *
 432  * DESCRIPTION: Converts all versions of the FADT to a common internal format.
 433  *              Expand 32-bit addresses to 64-bit as necessary. Also validate
 434  *              important fields within the FADT.
 435  *
 436  * NOTE:        acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must
 437  *              contain a copy of the actual BIOS-provided FADT.
 438  *
 439  * Notes on 64-bit register addresses:
 440  *
 441  * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
 442  * fields of the FADT for all ACPI register addresses.
 443  *
 444  * The 64-bit X fields are optional extensions to the original 32-bit FADT
 445  * V1.0 fields. Even if they are present in the FADT, they are optional and
 446  * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
 447  * 32-bit V1.0 fields to the 64-bit X fields if the the 64-bit X field is
 448  * originally zero.
 449  *
 450  * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address
 451  * fields are expanded to the corresponding 64-bit X fields in the internal
 452  * common FADT.
 453  *
 454  * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
 455  * to the corresponding 64-bit X fields, if the 64-bit field is originally
 456  * zero. Adhering to the ACPI specification, we completely ignore the 32-bit
 457  * field if the 64-bit field is valid, regardless of whether the host OS is
 458  * 32-bit or 64-bit.
 459  *
 460  * Possible additional checks:
 461  *  (acpi_gbl_FADT.pm1_event_length >= 4)
 462  *  (acpi_gbl_FADT.pm1_control_length >= 2)
 463  *  (acpi_gbl_FADT.pm_timer_length >= 4)
 464  *  Gpe block lengths must be multiple of 2
 465  *
 466  ******************************************************************************/
 467
 468 static void acpi_tb_convert_fadt(void)
 469 {
 470         char *name;
 471         struct acpi_generic_address *address64;
 472         u32 address32;
 473         u8 length;
 474         u8 flags;
 475         u32 i;
 476
 477         /*
 478          * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
 479          * should be zero are indeed zero. This will workaround BIOSs that
 480          * inadvertently place values in these fields.
 481          *
 482          * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
 483          * at offset 45, 55, 95, and the word located at offset 109, 110.
 484          *
 485          * Note: The FADT revision value is unreliable. Only the length can be
 486          * trusted.
 487          */
 488         if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
 489                 acpi_gbl_FADT.preferred_profile = 0;
 490                 acpi_gbl_FADT.pstate_control = 0;
 491                 acpi_gbl_FADT.cst_control = 0;
 492                 acpi_gbl_FADT.boot_flags = 0;
 493         }
 494
 495         /*
 496          * Now we can update the local FADT length to the length of the
 497          * current FADT version as defined by the ACPI specification.
 498          * Thus, we will have a common FADT internally.
 499          */
 500         acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
 501
 502         /*
 503          * Expand the 32-bit DSDT addresses to 64-bit as necessary.
 504          * Later ACPICA code will always use the X 64-bit field.
 505          */
 506         acpi_gbl_FADT.Xdsdt = acpi_tb_select_address("DSDT",
 507                                                      acpi_gbl_FADT.dsdt,
 508                                                      acpi_gbl_FADT.Xdsdt);
 509
 510         /* If Hardware Reduced flag is set, we are all done */
 511
 512         if (acpi_gbl_reduced_hardware) {
 513                 return;
 514         }
 515
 516         /* Examine all of the 64-bit extended address fields (X fields) */
 517
 518         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 519                 /*
 520                  * Get the 32-bit and 64-bit addresses, as well as the register
 521                  * length and register name.
 522                  */
 523                 address32 = *ACPI_ADD_PTR(u32,
 524                                           &acpi_gbl_FADT,
 525                                           fadt_info_table[i].address32);
 526
 527                 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
 528                                          &acpi_gbl_FADT,
 529                                          fadt_info_table[i].address64);
 530
 531                 length = *ACPI_ADD_PTR(u8,
 532                                        &acpi_gbl_FADT,
 533                                        fadt_info_table[i].length);
 534
 535                 name = fadt_info_table[i].name;
 536                 flags = fadt_info_table[i].flags;
 537
 538                 /*
 539                  * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
 540                  * generic address structures as necessary. Later code will always use
 541                  * the 64-bit address structures.
 542                  *
 543                  * November 2013:
 544                  * Now always use the 64-bit address if it is valid (non-zero), in
 545                  * accordance with the ACPI specification which states that a 64-bit
 546                  * address supersedes the 32-bit version. This behavior can be
 547                  * overridden by the acpi_gbl_use32_bit_fadt_addresses flag.
 548                  *
 549                  * During 64-bit address construction and verification,
 550                  * these cases are handled:
 551                  *
 552                  * Address32 zero, Address64 [don't care]   - Use Address64
 553                  *
 554                  * Address32 non-zero, Address64 zero       - Copy/use Address32
 555                  * Address32 non-zero == Address64 non-zero - Use Address64
 556                  * Address32 non-zero != Address64 non-zero - Warning, use Address64
 557                  *
 558                  * Override: if acpi_gbl_use32_bit_fadt_addresses is TRUE, and:
 559                  * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32
 560                  *
 561                  * Note: space_id is always I/O for 32-bit legacy address fields
 562                  */
 563                 if (address32) {
 564                         if (!address64->address) {
 565
 566                                 /* 64-bit address is zero, use 32-bit address */
 567
 568                                 acpi_tb_init_generic_address(address64,
 569                                                              ACPI_ADR_SPACE_SYSTEM_IO,
 570                                                              *ACPI_ADD_PTR(u8,
 571                                                                            &acpi_gbl_FADT,
 572                                                                            fadt_info_table
 573                                                                            [i].
 574                                                                            length),
 575                                                              (u64)address32,
 576                                                              name, flags);
 577                         } else if (address64->address != (u64)address32) {
 578
 579                                 /* Address mismatch */
 580
 581                                 ACPI_BIOS_WARNING((AE_INFO,
 582                                                    "32/64X address mismatch in FADT/%s: "
 583                                                    "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
 584                                                    name, address32,
 585                                                    ACPI_FORMAT_UINT64
 586                                                    (address64->address),
 587                                                    acpi_gbl_use32_bit_fadt_addresses
 588                                                    ? 32 : 64));
 589
 590                                 if (acpi_gbl_use32_bit_fadt_addresses) {
 591
 592                                         /* 32-bit address override */
 593
 594                                         acpi_tb_init_generic_address(address64,
 595                                                                      ACPI_ADR_SPACE_SYSTEM_IO,
 596                                                                      *ACPI_ADD_PTR
 597                                                                      (u8,
 598                                                                       &acpi_gbl_FADT,
 599                                                                       fadt_info_table
 600                                                                       [i].
 601                                                                       length),
 602                                                                      (u64)
 603                                                                      address32,
 604                                                                      name,
 605                                                                      flags);
 606                                 }
 607                         }
 608                 }
 609
 610                 /*
 611                  * For each extended field, check for length mismatch between the
 612                  * legacy length field and the corresponding 64-bit X length field.
 613                  * Note: If the legacy length field is > 0xFF bits, ignore this
 614                  * check. (GPE registers can be larger than the 64-bit GAS structure
 615                  * can accomodate, 0xFF bits).
 616                  */
 617                 if (address64->address &&
 618                     (ACPI_MUL_8(length) <= ACPI_UINT8_MAX) &&
 619                     (address64->bit_width != ACPI_MUL_8(length))) {
 620                         ACPI_BIOS_WARNING((AE_INFO,
 621                                            "32/64X length mismatch in FADT/%s: %u/%u",
 622                                            name, ACPI_MUL_8(length),
 623                                            address64->bit_width));
 624                 }
 625
 626                 if (fadt_info_table[i].flags & ACPI_FADT_REQUIRED) {
 627                         /*
 628                          * Field is required (Pm1a_event, Pm1a_control).
 629                          * Both the address and length must be non-zero.
 630                          */
 631                         if (!address64->address || !length) {
 632                                 ACPI_BIOS_ERROR((AE_INFO,
 633                                                  "Required FADT field %s has zero address and/or length: "
 634                                                  "0x%8.8X%8.8X/0x%X",
 635                                                  name,
 636                                                  ACPI_FORMAT_UINT64(address64->
 637                                                                     address),
 638                                                  length));
 639                         }
 640                 } else if (fadt_info_table[i].flags & ACPI_FADT_SEPARATE_LENGTH) {
 641                         /*
 642                          * Field is optional (Pm2_control, GPE0, GPE1) AND has its own
 643                          * length field. If present, both the address and length must
 644                          * be valid.
 645                          */
 646                         if ((address64->address && !length) ||
 647                             (!address64->address && length)) {
 648                                 ACPI_BIOS_WARNING((AE_INFO,
 649                                                    "Optional FADT field %s has zero address or length: "
 650                                                    "0x%8.8X%8.8X/0x%X",
 651                                                    name,
 652                                                    ACPI_FORMAT_UINT64
 653                                                    (address64->address),
 654                                                    length));
 655                         }
 656                 }
 657         }
 658 }
 659
 660 /*******************************************************************************
 661  *
 662  * FUNCTION:    acpi_tb_setup_fadt_registers
 663  *
 664  * PARAMETERS:  None, uses acpi_gbl_FADT.
 665  *
 666  * RETURN:      None
 667  *
 668  * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
 669  *              force FADT register definitions to their default lengths.
 670  *
 671  ******************************************************************************/
 672
 673 static void acpi_tb_setup_fadt_registers(void)
 674 {
 675         struct acpi_generic_address *target64;
 676         struct acpi_generic_address *source64;
 677         u8 pm1_register_byte_width;
 678         u32 i;
 679
 680         /*
 681          * Optionally check all register lengths against the default values and
 682          * update them if they are incorrect.
 683          */
 684         if (acpi_gbl_use_default_register_widths) {
 685                 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 686                         target64 =
 687                             ACPI_ADD_PTR(struct acpi_generic_address,
 688                                          &acpi_gbl_FADT,
 689                                          fadt_info_table[i].address64);
 690
 691                         /*
 692                          * If a valid register (Address != 0) and the (default_length > 0)
 693                          * (Not a GPE register), then check the width against the default.
 694                          */
 695                         if ((target64->address) &&
 696                             (fadt_info_table[i].default_length > 0) &&
 697                             (fadt_info_table[i].default_length !=
 698                              target64->bit_width)) {
 699                                 ACPI_BIOS_WARNING((AE_INFO,
 700                                                    "Invalid length for FADT/%s: %u, using default %u",
 701                                                    fadt_info_table[i].name,
 702                                                    target64->bit_width,
 703                                                    fadt_info_table[i].
 704                                                    default_length));
 705
 706                                 /* Incorrect size, set width to the default */
 707
 708                                 target64->bit_width =
 709                                     fadt_info_table[i].default_length;
 710                         }
 711                 }
 712         }
 713
 714         /*
 715          * Get the length of the individual PM1 registers (enable and status).
 716          * Each register is defined to be (event block length / 2). Extra divide
 717          * by 8 converts bits to bytes.
 718          */
 719         pm1_register_byte_width = (u8)
 720             ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
 721
 722         /*
 723          * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
 724          * registers. These addresses do not appear (directly) in the FADT, so it
 725          * is useful to pre-calculate them from the PM1 Event Block definitions.
 726          *
 727          * The PM event blocks are split into two register blocks, first is the
 728          * PM Status Register block, followed immediately by the PM Enable
 729          * Register block. Each is of length (pm1_event_length/2)
 730          *
 731          * Note: The PM1A event block is required by the ACPI specification.
 732          * However, the PM1B event block is optional and is rarely, if ever,
 733          * used.
 734          */
 735
 736         for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
 737                 source64 =
 738                     ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
 739                                  fadt_pm_info_table[i].source);
 740
 741                 if (source64->address) {
 742                         acpi_tb_init_generic_address(fadt_pm_info_table[i].
 743                                                      target, source64->space_id,
 744                                                      pm1_register_byte_width,
 745                                                      source64->address +
 746                                                      (fadt_pm_info_table[i].
 747                                                       register_num *
 748                                                       pm1_register_byte_width),
 749                                                      "PmRegisters", 0);
 750                 }
 751         }
 752 }