git.oblomov.eu 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/accommon.h>
  46 #include <acpi/amlresrc.h>
  47
  48 #define _COMPONENT          ACPI_UTILITIES
  49 ACPI_MODULE_NAME("utresrc")
  50 #if defined(ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
  51 /*
  52  * Strings used to decode resource descriptors.
  53  * Used by both the disasssembler and the debugger resource dump routines
  54  */
  55 const char *acpi_gbl_bm_decode[] = {
  56         "NotBusMaster",
  57         "BusMaster"
  58 };
  59
  60 const char *acpi_gbl_config_decode[] = {
  61         "0 - Good Configuration",
  62         "1 - Acceptable Configuration",
  63         "2 - Suboptimal Configuration",
  64         "3 - ***Invalid Configuration***",
  65 };
  66
  67 const char *acpi_gbl_consume_decode[] = {
  68         "ResourceProducer",
  69         "ResourceConsumer"
  70 };
  71
  72 const char *acpi_gbl_dec_decode[] = {
  73         "PosDecode",
  74         "SubDecode"
  75 };
  76
  77 const char *acpi_gbl_he_decode[] = {
  78         "Level",
  79         "Edge"
  80 };
  81
  82 const char *acpi_gbl_io_decode[] = {
  83         "Decode10",
  84         "Decode16"
  85 };
  86
  87 const char *acpi_gbl_ll_decode[] = {
  88         "ActiveHigh",
  89         "ActiveLow"
  90 };
  91
  92 const char *acpi_gbl_max_decode[] = {
  93         "MaxNotFixed",
  94         "MaxFixed"
  95 };
  96
  97 const char *acpi_gbl_mem_decode[] = {
  98         "NonCacheable",
  99         "Cacheable",
 100         "WriteCombining",
 101         "Prefetchable"
 102 };
 103
 104 const char *acpi_gbl_min_decode[] = {
 105         "MinNotFixed",
 106         "MinFixed"
 107 };
 108
 109 const char *acpi_gbl_mtp_decode[] = {
 110         "AddressRangeMemory",
 111         "AddressRangeReserved",
 112         "AddressRangeACPI",
 113         "AddressRangeNVS"
 114 };
 115
 116 const char *acpi_gbl_rng_decode[] = {
 117         "InvalidRanges",
 118         "NonISAOnlyRanges",
 119         "ISAOnlyRanges",
 120         "EntireRange"
 121 };
 122
 123 const char *acpi_gbl_rw_decode[] = {
 124         "ReadOnly",
 125         "ReadWrite"
 126 };
 127
 128 const char *acpi_gbl_shr_decode[] = {
 129         "Exclusive",
 130         "Shared"
 131 };
 132
 133 const char *acpi_gbl_siz_decode[] = {
 134         "Transfer8",
 135         "Transfer8_16",
 136         "Transfer16",
 137         "InvalidSize"
 138 };
 139
 140 const char *acpi_gbl_trs_decode[] = {
 141         "DenseTranslation",
 142         "SparseTranslation"
 143 };
 144
 145 const char *acpi_gbl_ttp_decode[] = {
 146         "TypeStatic",
 147         "TypeTranslation"
 148 };
 149
 150 const char *acpi_gbl_typ_decode[] = {
 151         "Compatibility",
 152         "TypeA",
 153         "TypeB",
 154         "TypeF"
 155 };
 156
 157 #endif
 158
 159 /*
 160  * Base sizes of the raw AML resource descriptors, indexed by resource type.
 161  * Zero indicates a reserved (and therefore invalid) resource type.
 162  */
 163 const u8 acpi_gbl_resource_aml_sizes[] = {
 164         /* Small descriptors */
 165
 166         0,
 167         0,
 168         0,
 169         0,
 170         ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
 171         ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
 172         ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
 173         ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
 174         ACPI_AML_SIZE_SMALL(struct aml_resource_io),
 175         ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
 176         0,
 177         0,
 178         0,
 179         0,
 180         ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
 181         ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),
 182
 183         /* Large descriptors */
 184
 185         0,
 186         ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
 187         ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
 188         0,
 189         ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
 190         ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
 191         ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
 192         ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
 193         ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
 194         ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
 195         ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
 196         ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64)
 197 };
 198
 199 /*
 200  * Resource types, used to validate the resource length field.
 201  * The length of fixed-length types must match exactly, variable
 202  * lengths must meet the minimum required length, etc.
 203  * Zero indicates a reserved (and therefore invalid) resource type.
 204  */
 205 static const u8 acpi_gbl_resource_types[] = {
 206         /* Small descriptors */
 207
 208         0,
 209         0,
 210         0,
 211         0,
 212         ACPI_SMALL_VARIABLE_LENGTH,
 213         ACPI_FIXED_LENGTH,
 214         ACPI_SMALL_VARIABLE_LENGTH,
 215         ACPI_FIXED_LENGTH,
 216         ACPI_FIXED_LENGTH,
 217         ACPI_FIXED_LENGTH,
 218         0,
 219         0,
 220         0,
 221         0,
 222         ACPI_VARIABLE_LENGTH,
 223         ACPI_FIXED_LENGTH,
 224
 225         /* Large descriptors */
 226
 227         0,
 228         ACPI_FIXED_LENGTH,
 229         ACPI_FIXED_LENGTH,
 230         0,
 231         ACPI_VARIABLE_LENGTH,
 232         ACPI_FIXED_LENGTH,
 233         ACPI_FIXED_LENGTH,
 234         ACPI_VARIABLE_LENGTH,
 235         ACPI_VARIABLE_LENGTH,
 236         ACPI_VARIABLE_LENGTH,
 237         ACPI_VARIABLE_LENGTH,
 238         ACPI_FIXED_LENGTH
 239 };
 240
 241 /*******************************************************************************
 242  *
 243  * FUNCTION:    acpi_ut_walk_aml_resources
 244  *
 245  * PARAMETERS:  Aml             - Pointer to the raw AML resource template
 246  *              aml_length      - Length of the entire template
 247  *              user_function   - Called once for each descriptor found. If
 248  *                                NULL, a pointer to the end_tag is returned
 249  *              Context         - Passed to user_function
 250  *
 251  * RETURN:      Status
 252  *
 253  * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
 254  *              once for each resource found.
 255  *
 256  ******************************************************************************/
 257
 258 acpi_status
 259 acpi_ut_walk_aml_resources(u8 * aml,
 260                            acpi_size aml_length,
 261                            acpi_walk_aml_callback user_function, void **context)
 262 {
 263         acpi_status status;
 264         u8 *end_aml;
 265         u8 resource_index;
 266         u32 length;
 267         u32 offset = 0;
 268
 269         ACPI_FUNCTION_TRACE(ut_walk_aml_resources);
 270
 271         /* The absolute minimum resource template is one end_tag descriptor */
 272
 273         if (aml_length < sizeof(struct aml_resource_end_tag)) {
 274                 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 275         }
 276
 277         /* Point to the end of the resource template buffer */
 278
 279         end_aml = aml + aml_length;
 280
 281         /* Walk the byte list, abort on any invalid descriptor type or length */
 282
 283         while (aml < end_aml) {
 284
 285                 /* Validate the Resource Type and Resource Length */
 286
 287                 status = acpi_ut_validate_resource(aml, &resource_index);
 288                 if (ACPI_FAILURE(status)) {
 289                         return_ACPI_STATUS(status);
 290                 }
 291
 292                 /* Get the length of this descriptor */
 293
 294                 length = acpi_ut_get_descriptor_length(aml);
 295
 296                 /* Invoke the user function */
 297
 298                 if (user_function) {
 299                         status =
 300                             user_function(aml, length, offset, resource_index,
 301                                           context);
 302                         if (ACPI_FAILURE(status)) {
 303                                 return (status);
 304                         }
 305                 }
 306
 307                 /* An end_tag descriptor terminates this resource template */
 308
 309                 if (acpi_ut_get_resource_type(aml) ==
 310                     ACPI_RESOURCE_NAME_END_TAG) {
 311                         /*
 312                          * There must be at least one more byte in the buffer for
 313                          * the 2nd byte of the end_tag
 314                          */
 315                         if ((aml + 1) >= end_aml) {
 316                                 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 317                         }
 318
 319                         /* Return the pointer to the end_tag if requested */
 320
 321                         if (!user_function) {
 322                                 *context = aml;
 323                         }
 324
 325                         /* Normal exit */
 326
 327                         return_ACPI_STATUS(AE_OK);
 328                 }
 329
 330                 aml += length;
 331                 offset += length;
 332         }
 333
 334         /* Did not find an end_tag descriptor */
 335
 336         return (AE_AML_NO_RESOURCE_END_TAG);
 337 }
 338
 339 /*******************************************************************************
 340  *
 341  * FUNCTION:    acpi_ut_validate_resource
 342  *
 343  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 344  *              return_index    - Where the resource index is returned. NULL
 345  *                                if the index is not required.
 346  *
 347  * RETURN:      Status, and optionally the Index into the global resource tables
 348  *
 349  * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
 350  *              Type and Resource Length. Returns an index into the global
 351  *              resource information/dispatch tables for later use.
 352  *
 353  ******************************************************************************/
 354
 355 acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index)
 356 {
 357         u8 resource_type;
 358         u8 resource_index;
 359         acpi_rs_length resource_length;
 360         acpi_rs_length minimum_resource_length;
 361
 362         ACPI_FUNCTION_ENTRY();
 363
 364         /*
 365          * 1) Validate the resource_type field (Byte 0)
 366          */
 367         resource_type = ACPI_GET8(aml);
 368
 369         /*
 370          * Byte 0 contains the descriptor name (Resource Type)
 371          * Examine the large/small bit in the resource header
 372          */
 373         if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
 374
 375                 /* Verify the large resource type (name) against the max */
 376
 377                 if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
 378                         return (AE_AML_INVALID_RESOURCE_TYPE);
 379                 }
 380
 381                 /*
 382                  * Large Resource Type -- bits 6:0 contain the name
 383                  * Translate range 0x80-0x8B to index range 0x10-0x1B
 384                  */
 385                 resource_index = (u8) (resource_type - 0x70);
 386         } else {
 387                 /*
 388                  * Small Resource Type -- bits 6:3 contain the name
 389                  * Shift range to index range 0x00-0x0F
 390                  */
 391                 resource_index = (u8)
 392                     ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
 393         }
 394
 395         /* Check validity of the resource type, zero indicates name is invalid */
 396
 397         if (!acpi_gbl_resource_types[resource_index]) {
 398                 return (AE_AML_INVALID_RESOURCE_TYPE);
 399         }
 400
 401         /*
 402          * 2) Validate the resource_length field. This ensures that the length
 403          *    is at least reasonable, and guarantees that it is non-zero.
 404          */
 405         resource_length = acpi_ut_get_resource_length(aml);
 406         minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];
 407
 408         /* Validate based upon the type of resource - fixed length or variable */
 409
 410         switch (acpi_gbl_resource_types[resource_index]) {
 411         case ACPI_FIXED_LENGTH:
 412
 413                 /* Fixed length resource, length must match exactly */
 414
 415                 if (resource_length != minimum_resource_length) {
 416                         return (AE_AML_BAD_RESOURCE_LENGTH);
 417                 }
 418                 break;
 419
 420         case ACPI_VARIABLE_LENGTH:
 421
 422                 /* Variable length resource, length must be at least the minimum */
 423
 424                 if (resource_length < minimum_resource_length) {
 425                         return (AE_AML_BAD_RESOURCE_LENGTH);
 426                 }
 427                 break;
 428
 429         case ACPI_SMALL_VARIABLE_LENGTH:
 430
 431                 /* Small variable length resource, length can be (Min) or (Min-1) */
 432
 433                 if ((resource_length > minimum_resource_length) ||
 434                     (resource_length < (minimum_resource_length - 1))) {
 435                         return (AE_AML_BAD_RESOURCE_LENGTH);
 436                 }
 437                 break;
 438
 439         default:
 440
 441                 /* Shouldn't happen (because of validation earlier), but be sure */
 442
 443                 return (AE_AML_INVALID_RESOURCE_TYPE);
 444         }
 445
 446         /* Optionally return the resource table index */
 447
 448         if (return_index) {
 449                 *return_index = resource_index;
 450         }
 451
 452         return (AE_OK);
 453 }
 454
 455 /*******************************************************************************
 456  *
 457  * FUNCTION:    acpi_ut_get_resource_type
 458  *
 459  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 460  *
 461  * RETURN:      The Resource Type with no extraneous bits (except the
 462  *              Large/Small descriptor bit -- this is left alone)
 463  *
 464  * DESCRIPTION: Extract the Resource Type/Name from the first byte of
 465  *              a resource descriptor.
 466  *
 467  ******************************************************************************/
 468
 469 u8 acpi_ut_get_resource_type(void *aml)
 470 {
 471         ACPI_FUNCTION_ENTRY();
 472
 473         /*
 474          * Byte 0 contains the descriptor name (Resource Type)
 475          * Examine the large/small bit in the resource header
 476          */
 477         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 478
 479                 /* Large Resource Type -- bits 6:0 contain the name */
 480
 481                 return (ACPI_GET8(aml));
 482         } else {
 483                 /* Small Resource Type -- bits 6:3 contain the name */
 484
 485                 return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
 486         }
 487 }
 488
 489 /*******************************************************************************
 490  *
 491  * FUNCTION:    acpi_ut_get_resource_length
 492  *
 493  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 494  *
 495  * RETURN:      Byte Length
 496  *
 497  * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
 498  *              definition, this does not include the size of the descriptor
 499  *              header or the length field itself.
 500  *
 501  ******************************************************************************/
 502
 503 u16 acpi_ut_get_resource_length(void *aml)
 504 {
 505         acpi_rs_length resource_length;
 506
 507         ACPI_FUNCTION_ENTRY();
 508
 509         /*
 510          * Byte 0 contains the descriptor name (Resource Type)
 511          * Examine the large/small bit in the resource header
 512          */
 513         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 514
 515                 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
 516
 517                 ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));
 518
 519         } else {
 520                 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
 521
 522                 resource_length = (u16) (ACPI_GET8(aml) &
 523                                          ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
 524         }
 525
 526         return (resource_length);
 527 }
 528
 529 /*******************************************************************************
 530  *
 531  * FUNCTION:    acpi_ut_get_resource_header_length
 532  *
 533  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 534  *
 535  * RETURN:      Length of the AML header (depends on large/small descriptor)
 536  *
 537  * DESCRIPTION: Get the length of the header for this resource.
 538  *
 539  ******************************************************************************/
 540
 541 u8 acpi_ut_get_resource_header_length(void *aml)
 542 {
 543         ACPI_FUNCTION_ENTRY();
 544
 545         /* Examine the large/small bit in the resource header */
 546
 547         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 548                 return (sizeof(struct aml_resource_large_header));
 549         } else {
 550                 return (sizeof(struct aml_resource_small_header));
 551         }
 552 }
 553
 554 /*******************************************************************************
 555  *
 556  * FUNCTION:    acpi_ut_get_descriptor_length
 557  *
 558  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 559  *
 560  * RETURN:      Byte length
 561  *
 562  * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
 563  *              length of the descriptor header and the length field itself.
 564  *              Used to walk descriptor lists.
 565  *
 566  ******************************************************************************/
 567
 568 u32 acpi_ut_get_descriptor_length(void *aml)
 569 {
 570         ACPI_FUNCTION_ENTRY();
 571
 572         /*
 573          * Get the Resource Length (does not include header length) and add
 574          * the header length (depends on if this is a small or large resource)
 575          */
 576         return (acpi_ut_get_resource_length(aml) +
 577                 acpi_ut_get_resource_header_length(aml));
 578 }
 579
 580 /*******************************************************************************
 581  *
 582  * FUNCTION:    acpi_ut_get_resource_end_tag
 583  *
 584  * PARAMETERS:  obj_desc        - The resource template buffer object
 585  *              end_tag         - Where the pointer to the end_tag is returned
 586  *
 587  * RETURN:      Status, pointer to the end tag
 588  *
 589  * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
 590  *              Note: allows a buffer length of zero.
 591  *
 592  ******************************************************************************/
 593
 594 acpi_status
 595 acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,
 596                              u8 ** end_tag)
 597 {
 598         acpi_status status;
 599
 600         ACPI_FUNCTION_TRACE(ut_get_resource_end_tag);
 601
 602         /* Allow a buffer length of zero */
 603
 604         if (!obj_desc->buffer.length) {
 605                 *end_tag = obj_desc->buffer.pointer;
 606                 return_ACPI_STATUS(AE_OK);
 607         }
 608
 609         /* Validate the template and get a pointer to the end_tag */
 610
 611         status = acpi_ut_walk_aml_resources(obj_desc->buffer.pointer,
 612                                             obj_desc->buffer.length, NULL,
 613                                             (void **)end_tag);
 614
 615         return_ACPI_STATUS(status);
 616 }