err.no Git - linux-2.6/blob - drivers/acpi/tables/tbfadt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbfadt   - FADT table utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include <acpi/actables.h>
  46
  47 #define _COMPONENT          ACPI_TABLES
  48 ACPI_MODULE_NAME("tbfadt")
  49
  50 /* Local prototypes */
  51 static void inline
  52 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
  53                              u8 bit_width, u64 address);
  54
  55 static void acpi_tb_convert_fadt(void);
  56
  57 static void acpi_tb_validate_fadt(void);
  58
  59 /* Table for conversion of FADT to common internal format and FADT validation */
  60
  61 typedef struct acpi_fadt_info {
  62         char *name;
  63         u8 target;
  64         u8 source;
  65         u8 length;
  66         u8 type;
  67
  68 } acpi_fadt_info;
  69
  70 #define ACPI_FADT_REQUIRED          1
  71 #define ACPI_FADT_SEPARATE_LENGTH   2
  72
  73 static struct acpi_fadt_info fadt_info_table[] = {
  74         {"Pm1aEventBlock", ACPI_FADT_OFFSET(xpm1a_event_block),
  75          ACPI_FADT_OFFSET(pm1a_event_block),
  76          ACPI_FADT_OFFSET(pm1_event_length), ACPI_FADT_REQUIRED},
  77
  78         {"Pm1bEventBlock", ACPI_FADT_OFFSET(xpm1b_event_block),
  79          ACPI_FADT_OFFSET(pm1b_event_block),
  80          ACPI_FADT_OFFSET(pm1_event_length), 0},
  81
  82         {"Pm1aControlBlock", ACPI_FADT_OFFSET(xpm1a_control_block),
  83          ACPI_FADT_OFFSET(pm1a_control_block),
  84          ACPI_FADT_OFFSET(pm1_control_length), ACPI_FADT_REQUIRED},
  85
  86         {"Pm1bControlBlock", ACPI_FADT_OFFSET(xpm1b_control_block),
  87          ACPI_FADT_OFFSET(pm1b_control_block),
  88          ACPI_FADT_OFFSET(pm1_control_length), 0},
  89
  90         {"Pm2ControlBlock", ACPI_FADT_OFFSET(xpm2_control_block),
  91          ACPI_FADT_OFFSET(pm2_control_block),
  92          ACPI_FADT_OFFSET(pm2_control_length), ACPI_FADT_SEPARATE_LENGTH},
  93
  94         {"PmTimerBlock", ACPI_FADT_OFFSET(xpm_timer_block),
  95          ACPI_FADT_OFFSET(pm_timer_block),
  96          ACPI_FADT_OFFSET(pm_timer_length), ACPI_FADT_REQUIRED},
  97
  98         {"Gpe0Block", ACPI_FADT_OFFSET(xgpe0_block),
  99          ACPI_FADT_OFFSET(gpe0_block),
 100          ACPI_FADT_OFFSET(gpe0_block_length), ACPI_FADT_SEPARATE_LENGTH},
 101
 102         {"Gpe1Block", ACPI_FADT_OFFSET(xgpe1_block),
 103          ACPI_FADT_OFFSET(gpe1_block),
 104          ACPI_FADT_OFFSET(gpe1_block_length), ACPI_FADT_SEPARATE_LENGTH}
 105 };
 106
 107 #define ACPI_FADT_INFO_ENTRIES        (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
 108
 109 /*******************************************************************************
 110  *
 111  * FUNCTION:    acpi_tb_init_generic_address
 112  *
 113  * PARAMETERS:  generic_address     - GAS struct to be initialized
 114  *              bit_width           - Width of this register
 115  *              Address             - Address of the register
 116  *
 117  * RETURN:      None
 118  *
 119  * DESCRIPTION: Initialize a Generic Address Structure (GAS)
 120  *              See the ACPI specification for a full description and
 121  *              definition of this structure.
 122  *
 123  ******************************************************************************/
 124
 125 static void inline
 126 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
 127                              u8 bit_width, u64 address)
 128 {
 129
 130         /*
 131          * The 64-bit Address field is non-aligned in the byte packed
 132          * GAS struct.
 133          */
 134         ACPI_MOVE_64_TO_64(&generic_address->address, &address);
 135
 136         /* All other fields are byte-wide */
 137
 138         generic_address->space_id = ACPI_ADR_SPACE_SYSTEM_IO;
 139         generic_address->bit_width = bit_width;
 140         generic_address->bit_offset = 0;
 141         generic_address->access_width = 0;
 142 }
 143
 144 /*******************************************************************************
 145  *
 146  * FUNCTION:    acpi_tb_parse_fadt
 147  *
 148  * PARAMETERS:  table_index         - Index for the FADT
 149  *              Flags               - Flags
 150  *
 151  * RETURN:      None
 152  *
 153  * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
 154  *              (FADT contains the addresses of the DSDT and FACS)
 155  *
 156  ******************************************************************************/
 157
 158 void acpi_tb_parse_fadt(acpi_native_uint table_index, u8 flags)
 159 {
 160         u32 length;
 161         struct acpi_table_header *table;
 162
 163         /*
 164          * The FADT has multiple versions with different lengths,
 165          * and it contains pointers to both the DSDT and FACS tables.
 166          *
 167          * Get a local copy of the FADT and convert it to a common format
 168          * Map entire FADT, assumed to be smaller than one page.
 169          */
 170         length = acpi_gbl_root_table_list.tables[table_index].length;
 171
 172         table =
 173             acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
 174                                address, length);
 175         if (!table) {
 176                 return;
 177         }
 178
 179         /*
 180          * Validate the FADT checksum before we copy the table. Ignore
 181          * checksum error as we want to try to get the DSDT and FACS.
 182          */
 183         (void)acpi_tb_verify_checksum(table, length);
 184
 185         /* Obtain a local copy of the FADT in common ACPI 2.0+ format */
 186
 187         acpi_tb_create_local_fadt(table, length);
 188
 189         /* All done with the real FADT, unmap it */
 190
 191         acpi_os_unmap_memory(table, length);
 192
 193         /* Obtain the DSDT and FACS tables via their addresses within the FADT */
 194
 195         acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
 196                               flags, ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
 197
 198         acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
 199                               flags, ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
 200 }
 201
 202 /*******************************************************************************
 203  *
 204  * FUNCTION:    acpi_tb_create_local_fadt
 205  *
 206  * PARAMETERS:  Table               - Pointer to BIOS FADT
 207  *              Length              - Length of the table
 208  *
 209  * RETURN:      None
 210  *
 211  * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
 212  *              Performs validation on some important FADT fields.
 213  *
 214  * NOTE:        We create a local copy of the FADT regardless of the version.
 215  *
 216  ******************************************************************************/
 217
 218 void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
 219 {
 220
 221         /*
 222          * Check if the FADT is larger than the largest table that we expect
 223          * (the ACPI 2.0/3.0 version). If so, truncate the table, and issue
 224          * a warning.
 225          */
 226         if (length > sizeof(struct acpi_table_fadt)) {
 227                 ACPI_WARNING((AE_INFO,
 228                               "FADT (revision %u) is longer than ACPI 2.0 version, truncating length 0x%X to 0x%zX",
 229                               table->revision, (unsigned)length,
 230                               sizeof(struct acpi_table_fadt)));
 231         }
 232
 233         /* Clear the entire local FADT */
 234
 235         ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
 236
 237         /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
 238
 239         ACPI_MEMCPY(&acpi_gbl_FADT, table,
 240                     ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
 241
 242         /*
 243          * 1) Convert the local copy of the FADT to the common internal format
 244          * 2) Validate some of the important values within the FADT
 245          */
 246         acpi_tb_convert_fadt();
 247         acpi_tb_validate_fadt();
 248 }
 249
 250 /*******************************************************************************
 251  *
 252  * FUNCTION:    acpi_tb_convert_fadt
 253  *
 254  * PARAMETERS:  None, uses acpi_gbl_FADT
 255  *
 256  * RETURN:      None
 257  *
 258  * DESCRIPTION: Converts all versions of the FADT to a common internal format.
 259  *              Expand all 32-bit addresses to 64-bit.
 260  *
 261  * NOTE:        acpi_gbl_FADT must be of size (struct acpi_table_fadt),
 262  *              and must contain a copy of the actual FADT.
 263  *
 264  * ACPICA will use the "X" fields of the FADT for all addresses.
 265  *
 266  * "X" fields are optional extensions to the original V1.0 fields. Even if
 267  * they are present in the structure, they can be optionally not used by
 268  * setting them to zero. Therefore, we must selectively expand V1.0 fields
 269  * if the corresponding X field is zero.
 270  *
 271  * For ACPI 1.0 FADTs, all address fields are expanded to the corresponding
 272  * "X" fields.
 273  *
 274  * For ACPI 2.0 FADTs, any "X" fields that are NULL are filled in by
 275  * expanding the corresponding ACPI 1.0 field.
 276  *
 277  ******************************************************************************/
 278
 279 static void acpi_tb_convert_fadt(void)
 280 {
 281         u8 pm1_register_length;
 282         struct acpi_generic_address *target;
 283         acpi_native_uint i;
 284
 285         /* Update the local FADT table header length */
 286
 287         acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
 288
 289         /* Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary */
 290
 291         if (!acpi_gbl_FADT.Xfacs) {
 292                 acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
 293         }
 294
 295         if (!acpi_gbl_FADT.Xdsdt) {
 296                 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
 297         }
 298
 299         /*
 300          * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
 301          * should be zero are indeed zero. This will workaround BIOSs that
 302          * inadvertently place values in these fields.
 303          *
 304          * The ACPI 1.0 reserved fields that will be zeroed are the bytes located at
 305          * offset 45, 55, 95, and the word located at offset 109, 110.
 306          */
 307         if (acpi_gbl_FADT.header.revision < 3) {
 308                 acpi_gbl_FADT.preferred_profile = 0;
 309                 acpi_gbl_FADT.pstate_control = 0;
 310                 acpi_gbl_FADT.cst_control = 0;
 311                 acpi_gbl_FADT.boot_flags = 0;
 312         }
 313
 314         /*
 315          * Expand the ACPI 1.0 32-bit V1.0 addresses to the ACPI 2.0 64-bit "X"
 316          * generic address structures as necessary.
 317          */
 318         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 319                 target =
 320                     ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
 321                                  fadt_info_table[i].target);
 322
 323                 /* Expand only if the X target is null */
 324
 325                 if (!target->address) {
 326                         acpi_tb_init_generic_address(target,
 327                                                      *ACPI_ADD_PTR(u8,
 328                                                                    &acpi_gbl_FADT,
 329                                                                    fadt_info_table
 330                                                                    [i].length),
 331                                                      (u64) * ACPI_ADD_PTR(u32,
 332                                                                           &acpi_gbl_FADT,
 333                                                                           fadt_info_table
 334                                                                           [i].
 335                                                                           source));
 336                 }
 337         }
 338
 339         /*
 340          * Calculate separate GAS structs for the PM1 Enable registers.
 341          * These addresses do not appear (directly) in the FADT, so it is
 342          * useful to calculate them once, here.
 343          *
 344          * The PM event blocks are split into two register blocks, first is the
 345          * PM Status Register block, followed immediately by the PM Enable Register
 346          * block. Each is of length (pm1_event_length/2)
 347          */
 348         pm1_register_length = (u8) ACPI_DIV_2(acpi_gbl_FADT.pm1_event_length);
 349
 350         /* The PM1A register block is required */
 351
 352         acpi_tb_init_generic_address(&acpi_gbl_xpm1a_enable,
 353                                      pm1_register_length,
 354                                      (acpi_gbl_FADT.xpm1a_event_block.address +
 355                                       pm1_register_length));
 356         /* Don't forget to copy space_id of the GAS */
 357         acpi_gbl_xpm1a_enable.space_id =
 358             acpi_gbl_FADT.xpm1a_event_block.space_id;
 359
 360         /* The PM1B register block is optional, ignore if not present */
 361
 362         if (acpi_gbl_FADT.xpm1b_event_block.address) {
 363                 acpi_tb_init_generic_address(&acpi_gbl_xpm1b_enable,
 364                                              pm1_register_length,
 365                                              (acpi_gbl_FADT.xpm1b_event_block.
 366                                               address + pm1_register_length));
 367                 /* Don't forget to copy space_id of the GAS */
 368                 acpi_gbl_xpm1b_enable.space_id =
 369                     acpi_gbl_FADT.xpm1a_event_block.space_id;
 370
 371         }
 372 }
 373
 374 /******************************************************************************
 375  *
 376  * FUNCTION:    acpi_tb_validate_fadt
 377  *
 378  * PARAMETERS:  Table           - Pointer to the FADT to be validated
 379  *
 380  * RETURN:      None
 381  *
 382  * DESCRIPTION: Validate various important fields within the FADT. If a problem
 383  *              is found, issue a message, but no status is returned.
 384  *              Used by both the table manager and the disassembler.
 385  *
 386  * Possible additional checks:
 387  * (acpi_gbl_FADT.pm1_event_length >= 4)
 388  * (acpi_gbl_FADT.pm1_control_length >= 2)
 389  * (acpi_gbl_FADT.pm_timer_length >= 4)
 390  * Gpe block lengths must be multiple of 2
 391  *
 392  ******************************************************************************/
 393
 394 static void acpi_tb_validate_fadt(void)
 395 {
 396         u32 *address32;
 397         struct acpi_generic_address *address64;
 398         u8 length;
 399         acpi_native_uint i;
 400
 401         /* Examine all of the 64-bit extended address fields (X fields) */
 402
 403         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
 404
 405                 /* Generate pointers to the 32-bit and 64-bit addresses and get the length */
 406
 407                 address64 =
 408                     ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
 409                                  fadt_info_table[i].target);
 410                 address32 =
 411                     ACPI_ADD_PTR(u32, &acpi_gbl_FADT,
 412                                  fadt_info_table[i].source);
 413                 length =
 414                     *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
 415                                   fadt_info_table[i].length);
 416
 417                 if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
 418                         /*
 419                          * Field is required (Pm1a_event, Pm1a_control, pm_timer).
 420                          * Both the address and length must be non-zero.
 421                          */
 422                         if (!address64->address || !length) {
 423                                 ACPI_ERROR((AE_INFO,
 424                                             "Required field \"%s\" has zero address and/or length: %8.8X%8.8X/%X",
 425                                             fadt_info_table[i].name,
 426                                             ACPI_FORMAT_UINT64(address64->
 427                                                                address),
 428                                             length));
 429                         }
 430                 } else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
 431                         /*
 432                          * Field is optional (PM2Control, GPE0, GPE1) AND has its own
 433                          * length field. If present, both the address and length must be valid.
 434                          */
 435                         if ((address64->address && !length)
 436                             || (!address64->address && length)) {
 437                                 ACPI_WARNING((AE_INFO,
 438                                               "Optional field \"%s\" has zero address or length: %8.8X%8.8X/%X",
 439                                               fadt_info_table[i].name,
 440                                               ACPI_FORMAT_UINT64(address64->
 441                                                                  address),
 442                                               length));
 443                         }
 444                 }
 445
 446                 /* If both 32- and 64-bit addresses are valid (non-zero), they must match */
 447
 448                 if (address64->address && *address32 &&
 449                     (address64->address != (u64) * address32)) {
 450                         ACPI_ERROR((AE_INFO,
 451                                     "32/64X address mismatch in \"%s\": [%8.8X] [%8.8X%8.8X], using 64X",
 452                                     fadt_info_table[i].name, *address32,
 453                                     ACPI_FORMAT_UINT64(address64->address)));
 454                 }
 455         }
 456 }