err.no Git - linux-2.6/blob - drivers/acpi/utilities/utresrc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utresrc - Resource management utilities
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include <acpi/amlresrc.h>
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utresrc")
  49 #if defined(ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
  50 /*
  51  * Strings used to decode resource descriptors.
  52  * Used by both the disasssembler and the debugger resource dump routines
  53  */
  54 const char *acpi_gbl_bm_decode[] = {
  55         "NotBusMaster",
  56         "BusMaster"
  57 };
  58
  59 const char *acpi_gbl_config_decode[] = {
  60         "0 - Good Configuration",
  61         "1 - Acceptable Configuration",
  62         "2 - Suboptimal Configuration",
  63         "3 - ***Invalid Configuration***",
  64 };
  65
  66 const char *acpi_gbl_consume_decode[] = {
  67         "ResourceProducer",
  68         "ResourceConsumer"
  69 };
  70
  71 const char *acpi_gbl_dec_decode[] = {
  72         "PosDecode",
  73         "SubDecode"
  74 };
  75
  76 const char *acpi_gbl_he_decode[] = {
  77         "Level",
  78         "Edge"
  79 };
  80
  81 const char *acpi_gbl_io_decode[] = {
  82         "Decode10",
  83         "Decode16"
  84 };
  85
  86 const char *acpi_gbl_ll_decode[] = {
  87         "ActiveHigh",
  88         "ActiveLow"
  89 };
  90
  91 const char *acpi_gbl_max_decode[] = {
  92         "MaxNotFixed",
  93         "MaxFixed"
  94 };
  95
  96 const char *acpi_gbl_mem_decode[] = {
  97         "NonCacheable",
  98         "Cacheable",
  99         "WriteCombining",
 100         "Prefetchable"
 101 };
 102
 103 const char *acpi_gbl_min_decode[] = {
 104         "MinNotFixed",
 105         "MinFixed"
 106 };
 107
 108 const char *acpi_gbl_mtp_decode[] = {
 109         "AddressRangeMemory",
 110         "AddressRangeReserved",
 111         "AddressRangeACPI",
 112         "AddressRangeNVS"
 113 };
 114
 115 const char *acpi_gbl_rng_decode[] = {
 116         "InvalidRanges",
 117         "NonISAOnlyRanges",
 118         "ISAOnlyRanges",
 119         "EntireRange"
 120 };
 121
 122 const char *acpi_gbl_rw_decode[] = {
 123         "ReadOnly",
 124         "ReadWrite"
 125 };
 126
 127 const char *acpi_gbl_shr_decode[] = {
 128         "Exclusive",
 129         "Shared"
 130 };
 131
 132 const char *acpi_gbl_siz_decode[] = {
 133         "Transfer8",
 134         "Transfer8_16",
 135         "Transfer16",
 136         "InvalidSize"
 137 };
 138
 139 const char *acpi_gbl_trs_decode[] = {
 140         "DenseTranslation",
 141         "SparseTranslation"
 142 };
 143
 144 const char *acpi_gbl_ttp_decode[] = {
 145         "TypeStatic",
 146         "TypeTranslation"
 147 };
 148
 149 const char *acpi_gbl_typ_decode[] = {
 150         "Compatibility",
 151         "TypeA",
 152         "TypeB",
 153         "TypeF"
 154 };
 155
 156 #endif
 157
 158 /*
 159  * Base sizes of the raw AML resource descriptors, indexed by resource type.
 160  * Zero indicates a reserved (and therefore invalid) resource type.
 161  */
 162 const u8 acpi_gbl_resource_aml_sizes[] = {
 163         /* Small descriptors */
 164
 165         0,
 166         0,
 167         0,
 168         0,
 169         ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
 170         ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
 171         ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
 172         ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
 173         ACPI_AML_SIZE_SMALL(struct aml_resource_io),
 174         ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
 175         0,
 176         0,
 177         0,
 178         0,
 179         ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
 180         ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),
 181
 182         /* Large descriptors */
 183
 184         0,
 185         ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
 186         ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
 187         0,
 188         ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
 189         ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
 190         ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
 191         ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
 192         ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
 193         ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
 194         ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
 195         ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64)
 196 };
 197
 198 /*
 199  * Resource types, used to validate the resource length field.
 200  * The length of fixed-length types must match exactly, variable
 201  * lengths must meet the minimum required length, etc.
 202  * Zero indicates a reserved (and therefore invalid) resource type.
 203  */
 204 static const u8 acpi_gbl_resource_types[] = {
 205         /* Small descriptors */
 206
 207         0,
 208         0,
 209         0,
 210         0,
 211         ACPI_SMALL_VARIABLE_LENGTH,
 212         ACPI_FIXED_LENGTH,
 213         ACPI_SMALL_VARIABLE_LENGTH,
 214         ACPI_FIXED_LENGTH,
 215         ACPI_FIXED_LENGTH,
 216         ACPI_FIXED_LENGTH,
 217         0,
 218         0,
 219         0,
 220         0,
 221         ACPI_VARIABLE_LENGTH,
 222         ACPI_FIXED_LENGTH,
 223
 224         /* Large descriptors */
 225
 226         0,
 227         ACPI_FIXED_LENGTH,
 228         ACPI_FIXED_LENGTH,
 229         0,
 230         ACPI_VARIABLE_LENGTH,
 231         ACPI_FIXED_LENGTH,
 232         ACPI_FIXED_LENGTH,
 233         ACPI_VARIABLE_LENGTH,
 234         ACPI_VARIABLE_LENGTH,
 235         ACPI_VARIABLE_LENGTH,
 236         ACPI_VARIABLE_LENGTH,
 237         ACPI_FIXED_LENGTH
 238 };
 239
 240 /*******************************************************************************
 241  *
 242  * FUNCTION:    acpi_ut_walk_aml_resources
 243  *
 244  * PARAMETERS:  Aml             - Pointer to the raw AML resource template
 245  *              aml_length      - Length of the entire template
 246  *              user_function   - Called once for each descriptor found. If
 247  *                                NULL, a pointer to the end_tag is returned
 248  *              Context         - Passed to user_function
 249  *
 250  * RETURN:      Status
 251  *
 252  * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
 253  *              once for each resource found.
 254  *
 255  ******************************************************************************/
 256
 257 acpi_status
 258 acpi_ut_walk_aml_resources(u8 * aml,
 259                            acpi_size aml_length,
 260                            acpi_walk_aml_callback user_function, void **context)
 261 {
 262         acpi_status status;
 263         u8 *end_aml;
 264         u8 resource_index;
 265         u32 length;
 266         u32 offset = 0;
 267
 268         ACPI_FUNCTION_TRACE(ut_walk_aml_resources);
 269
 270         /* The absolute minimum resource template is one end_tag descriptor */
 271
 272         if (aml_length < sizeof(struct aml_resource_end_tag)) {
 273                 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 274         }
 275
 276         /* Point to the end of the resource template buffer */
 277
 278         end_aml = aml + aml_length;
 279
 280         /* Walk the byte list, abort on any invalid descriptor type or length */
 281
 282         while (aml < end_aml) {
 283
 284                 /* Validate the Resource Type and Resource Length */
 285
 286                 status = acpi_ut_validate_resource(aml, &resource_index);
 287                 if (ACPI_FAILURE(status)) {
 288                         return_ACPI_STATUS(status);
 289                 }
 290
 291                 /* Get the length of this descriptor */
 292
 293                 length = acpi_ut_get_descriptor_length(aml);
 294
 295                 /* Invoke the user function */
 296
 297                 if (user_function) {
 298                         status =
 299                             user_function(aml, length, offset, resource_index,
 300                                           context);
 301                         if (ACPI_FAILURE(status)) {
 302                                 return (status);
 303                         }
 304                 }
 305
 306                 /* An end_tag descriptor terminates this resource template */
 307
 308                 if (acpi_ut_get_resource_type(aml) ==
 309                     ACPI_RESOURCE_NAME_END_TAG) {
 310                         /*
 311                          * There must be at least one more byte in the buffer for
 312                          * the 2nd byte of the end_tag
 313                          */
 314                         if ((aml + 1) >= end_aml) {
 315                                 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 316                         }
 317
 318                         /* Return the pointer to the end_tag if requested */
 319
 320                         if (!user_function) {
 321                                 *context = aml;
 322                         }
 323
 324                         /* Normal exit */
 325
 326                         return_ACPI_STATUS(AE_OK);
 327                 }
 328
 329                 aml += length;
 330                 offset += length;
 331         }
 332
 333         /* Did not find an end_tag descriptor */
 334
 335         return (AE_AML_NO_RESOURCE_END_TAG);
 336 }
 337
 338 /*******************************************************************************
 339  *
 340  * FUNCTION:    acpi_ut_validate_resource
 341  *
 342  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 343  *              return_index    - Where the resource index is returned. NULL
 344  *                                if the index is not required.
 345  *
 346  * RETURN:      Status, and optionally the Index into the global resource tables
 347  *
 348  * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
 349  *              Type and Resource Length. Returns an index into the global
 350  *              resource information/dispatch tables for later use.
 351  *
 352  ******************************************************************************/
 353
 354 acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index)
 355 {
 356         u8 resource_type;
 357         u8 resource_index;
 358         acpi_rs_length resource_length;
 359         acpi_rs_length minimum_resource_length;
 360
 361         ACPI_FUNCTION_ENTRY();
 362
 363         /*
 364          * 1) Validate the resource_type field (Byte 0)
 365          */
 366         resource_type = ACPI_GET8(aml);
 367
 368         /*
 369          * Byte 0 contains the descriptor name (Resource Type)
 370          * Examine the large/small bit in the resource header
 371          */
 372         if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
 373
 374                 /* Verify the large resource type (name) against the max */
 375
 376                 if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
 377                         return (AE_AML_INVALID_RESOURCE_TYPE);
 378                 }
 379
 380                 /*
 381                  * Large Resource Type -- bits 6:0 contain the name
 382                  * Translate range 0x80-0x8B to index range 0x10-0x1B
 383                  */
 384                 resource_index = (u8) (resource_type - 0x70);
 385         } else {
 386                 /*
 387                  * Small Resource Type -- bits 6:3 contain the name
 388                  * Shift range to index range 0x00-0x0F
 389                  */
 390                 resource_index = (u8)
 391                     ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
 392         }
 393
 394         /* Check validity of the resource type, zero indicates name is invalid */
 395
 396         if (!acpi_gbl_resource_types[resource_index]) {
 397                 return (AE_AML_INVALID_RESOURCE_TYPE);
 398         }
 399
 400         /*
 401          * 2) Validate the resource_length field. This ensures that the length
 402          *    is at least reasonable, and guarantees that it is non-zero.
 403          */
 404         resource_length = acpi_ut_get_resource_length(aml);
 405         minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];
 406
 407         /* Validate based upon the type of resource - fixed length or variable */
 408
 409         switch (acpi_gbl_resource_types[resource_index]) {
 410         case ACPI_FIXED_LENGTH:
 411
 412                 /* Fixed length resource, length must match exactly */
 413
 414                 if (resource_length != minimum_resource_length) {
 415                         return (AE_AML_BAD_RESOURCE_LENGTH);
 416                 }
 417                 break;
 418
 419         case ACPI_VARIABLE_LENGTH:
 420
 421                 /* Variable length resource, length must be at least the minimum */
 422
 423                 if (resource_length < minimum_resource_length) {
 424                         return (AE_AML_BAD_RESOURCE_LENGTH);
 425                 }
 426                 break;
 427
 428         case ACPI_SMALL_VARIABLE_LENGTH:
 429
 430                 /* Small variable length resource, length can be (Min) or (Min-1) */
 431
 432                 if ((resource_length > minimum_resource_length) ||
 433                     (resource_length < (minimum_resource_length - 1))) {
 434                         return (AE_AML_BAD_RESOURCE_LENGTH);
 435                 }
 436                 break;
 437
 438         default:
 439
 440                 /* Shouldn't happen (because of validation earlier), but be sure */
 441
 442                 return (AE_AML_INVALID_RESOURCE_TYPE);
 443         }
 444
 445         /* Optionally return the resource table index */
 446
 447         if (return_index) {
 448                 *return_index = resource_index;
 449         }
 450
 451         return (AE_OK);
 452 }
 453
 454 /*******************************************************************************
 455  *
 456  * FUNCTION:    acpi_ut_get_resource_type
 457  *
 458  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 459  *
 460  * RETURN:      The Resource Type with no extraneous bits (except the
 461  *              Large/Small descriptor bit -- this is left alone)
 462  *
 463  * DESCRIPTION: Extract the Resource Type/Name from the first byte of
 464  *              a resource descriptor.
 465  *
 466  ******************************************************************************/
 467
 468 u8 acpi_ut_get_resource_type(void *aml)
 469 {
 470         ACPI_FUNCTION_ENTRY();
 471
 472         /*
 473          * Byte 0 contains the descriptor name (Resource Type)
 474          * Examine the large/small bit in the resource header
 475          */
 476         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 477
 478                 /* Large Resource Type -- bits 6:0 contain the name */
 479
 480                 return (ACPI_GET8(aml));
 481         } else {
 482                 /* Small Resource Type -- bits 6:3 contain the name */
 483
 484                 return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
 485         }
 486 }
 487
 488 /*******************************************************************************
 489  *
 490  * FUNCTION:    acpi_ut_get_resource_length
 491  *
 492  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 493  *
 494  * RETURN:      Byte Length
 495  *
 496  * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
 497  *              definition, this does not include the size of the descriptor
 498  *              header or the length field itself.
 499  *
 500  ******************************************************************************/
 501
 502 u16 acpi_ut_get_resource_length(void *aml)
 503 {
 504         acpi_rs_length resource_length;
 505
 506         ACPI_FUNCTION_ENTRY();
 507
 508         /*
 509          * Byte 0 contains the descriptor name (Resource Type)
 510          * Examine the large/small bit in the resource header
 511          */
 512         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 513
 514                 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
 515
 516                 ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));
 517
 518         } else {
 519                 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
 520
 521                 resource_length = (u16) (ACPI_GET8(aml) &
 522                                          ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
 523         }
 524
 525         return (resource_length);
 526 }
 527
 528 /*******************************************************************************
 529  *
 530  * FUNCTION:    acpi_ut_get_resource_header_length
 531  *
 532  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 533  *
 534  * RETURN:      Length of the AML header (depends on large/small descriptor)
 535  *
 536  * DESCRIPTION: Get the length of the header for this resource.
 537  *
 538  ******************************************************************************/
 539
 540 u8 acpi_ut_get_resource_header_length(void *aml)
 541 {
 542         ACPI_FUNCTION_ENTRY();
 543
 544         /* Examine the large/small bit in the resource header */
 545
 546         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 547                 return (sizeof(struct aml_resource_large_header));
 548         } else {
 549                 return (sizeof(struct aml_resource_small_header));
 550         }
 551 }
 552
 553 /*******************************************************************************
 554  *
 555  * FUNCTION:    acpi_ut_get_descriptor_length
 556  *
 557  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 558  *
 559  * RETURN:      Byte length
 560  *
 561  * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
 562  *              length of the descriptor header and the length field itself.
 563  *              Used to walk descriptor lists.
 564  *
 565  ******************************************************************************/
 566
 567 u32 acpi_ut_get_descriptor_length(void *aml)
 568 {
 569         ACPI_FUNCTION_ENTRY();
 570
 571         /*
 572          * Get the Resource Length (does not include header length) and add
 573          * the header length (depends on if this is a small or large resource)
 574          */
 575         return (acpi_ut_get_resource_length(aml) +
 576                 acpi_ut_get_resource_header_length(aml));
 577 }
 578
 579 /*******************************************************************************
 580  *
 581  * FUNCTION:    acpi_ut_get_resource_end_tag
 582  *
 583  * PARAMETERS:  obj_desc        - The resource template buffer object
 584  *              end_tag         - Where the pointer to the end_tag is returned
 585  *
 586  * RETURN:      Status, pointer to the end tag
 587  *
 588  * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
 589  *              Note: allows a buffer length of zero.
 590  *
 591  ******************************************************************************/
 592
 593 acpi_status
 594 acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,
 595                              u8 ** end_tag)
 596 {
 597         acpi_status status;
 598
 599         ACPI_FUNCTION_TRACE(ut_get_resource_end_tag);
 600
 601         /* Allow a buffer length of zero */
 602
 603         if (!obj_desc->buffer.length) {
 604                 *end_tag = obj_desc->buffer.pointer;
 605                 return_ACPI_STATUS(AE_OK);
 606         }
 607
 608         /* Validate the template and get a pointer to the end_tag */
 609
 610         status = acpi_ut_walk_aml_resources(obj_desc->buffer.pointer,
 611                                             obj_desc->buffer.length, NULL,
 612                                             (void **)end_tag);
 613
 614         return_ACPI_STATUS(status);
 615 }