drivers/acpi/utilities/utresrc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utresrc - Resource managment utilities
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, 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/amlresrc.h>
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utmisc")
  49
  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_BMdecode[2] = {
  56         "not_bus_master",
  57         "bus_master"
  58 };
  59
  60 const char *acpi_gbl_config_decode[4] = {
  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[2] = {
  68         "resource_producer",
  69         "resource_consumer"
  70 };
  71
  72 const char *acpi_gbl_DECdecode[2] = {
  73         "pos_decode",
  74         "sub_decode"
  75 };
  76
  77 const char *acpi_gbl_HEdecode[2] = {
  78         "Level",
  79         "Edge"
  80 };
  81
  82 const char *acpi_gbl_io_decode[2] = {
  83         "Decode10",
  84         "Decode16"
  85 };
  86
  87 const char *acpi_gbl_LLdecode[2] = {
  88         "active_high",
  89         "active_low"
  90 };
  91
  92 const char *acpi_gbl_max_decode[2] = {
  93         "max_not_fixed",
  94         "max_fixed"
  95 };
  96
  97 const char *acpi_gbl_MEMdecode[4] = {
  98         "non_cacheable",
  99         "Cacheable",
 100         "write_combining",
 101         "Prefetchable"
 102 };
 103
 104 const char *acpi_gbl_min_decode[2] = {
 105         "min_not_fixed",
 106         "min_fixed"
 107 };
 108
 109 const char *acpi_gbl_MTPdecode[4] = {
 110         "address_range_memory",
 111         "address_range_reserved",
 112         "address_range_aCPI",
 113         "address_range_nVS"
 114 };
 115
 116 const char *acpi_gbl_RNGdecode[4] = {
 117         "invalid_ranges",
 118         "non_iSAonly_ranges",
 119         "ISAonly_ranges",
 120         "entire_range"
 121 };
 122
 123 const char *acpi_gbl_RWdecode[2] = {
 124         "read_only",
 125         "read_write"
 126 };
 127
 128 const char *acpi_gbl_SHRdecode[2] = {
 129         "Exclusive",
 130         "Shared"
 131 };
 132
 133 const char *acpi_gbl_SIZdecode[4] = {
 134         "Transfer8",
 135         "Transfer8_16",
 136         "Transfer16",
 137         "invalid_size"
 138 };
 139
 140 const char *acpi_gbl_TRSdecode[2] = {
 141         "dense_translation",
 142         "sparse_translation"
 143 };
 144
 145 const char *acpi_gbl_TTPdecode[2] = {
 146         "type_static",
 147         "type_translation"
 148 };
 149
 150 const char *acpi_gbl_TYPdecode[4] = {
 151         "Compatibility",
 152         "type_a",
 153         "type_b",
 154         "type_f"
 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_validate_resource
 244  *
 245  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 246  *              return_index    - Where the resource index is returned. NULL
 247  *                                if the index is not required.
 248  *
 249  * RETURN:      Status, and optionally the Index into the global resource tables
 250  *
 251  * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
 252  *              Type and Resource Length. Returns an index into the global
 253  *              resource information/dispatch tables for later use.
 254  *
 255  ******************************************************************************/
 256
 257 acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index)
 258 {
 259         u8 resource_type;
 260         u8 resource_index;
 261         acpi_rs_length resource_length;
 262         acpi_rs_length minimum_resource_length;
 263
 264         ACPI_FUNCTION_ENTRY();
 265
 266         /*
 267          * 1) Validate the resource_type field (Byte 0)
 268          */
 269         resource_type = ACPI_GET8(aml);
 270
 271         /*
 272          * Byte 0 contains the descriptor name (Resource Type)
 273          * Examine the large/small bit in the resource header
 274          */
 275         if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
 276                 /* Verify the large resource type (name) against the max */
 277
 278                 if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
 279                         return (AE_AML_INVALID_RESOURCE_TYPE);
 280                 }
 281
 282                 /*
 283                  * Large Resource Type -- bits 6:0 contain the name
 284                  * Translate range 0x80-0x8B to index range 0x10-0x1B
 285                  */
 286                 resource_index = (u8) (resource_type - 0x70);
 287         } else {
 288                 /*
 289                  * Small Resource Type -- bits 6:3 contain the name
 290                  * Shift range to index range 0x00-0x0F
 291                  */
 292                 resource_index = (u8)
 293                     ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
 294         }
 295
 296         /* Check validity of the resource type, zero indicates name is invalid */
 297
 298         if (!acpi_gbl_resource_types[resource_index]) {
 299                 return (AE_AML_INVALID_RESOURCE_TYPE);
 300         }
 301
 302         /*
 303          * 2) Validate the resource_length field. This ensures that the length
 304          *    is at least reasonable, and guarantees that it is non-zero.
 305          */
 306         resource_length = acpi_ut_get_resource_length(aml);
 307         minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];
 308
 309         /* Validate based upon the type of resource - fixed length or variable */
 310
 311         switch (acpi_gbl_resource_types[resource_index]) {
 312         case ACPI_FIXED_LENGTH:
 313
 314                 /* Fixed length resource, length must match exactly */
 315
 316                 if (resource_length != minimum_resource_length) {
 317                         return (AE_AML_BAD_RESOURCE_LENGTH);
 318                 }
 319                 break;
 320
 321         case ACPI_VARIABLE_LENGTH:
 322
 323                 /* Variable length resource, length must be at least the minimum */
 324
 325                 if (resource_length < minimum_resource_length) {
 326                         return (AE_AML_BAD_RESOURCE_LENGTH);
 327                 }
 328                 break;
 329
 330         case ACPI_SMALL_VARIABLE_LENGTH:
 331
 332                 /* Small variable length resource, length can be (Min) or (Min-1) */
 333
 334                 if ((resource_length > minimum_resource_length) ||
 335                     (resource_length < (minimum_resource_length - 1))) {
 336                         return (AE_AML_BAD_RESOURCE_LENGTH);
 337                 }
 338                 break;
 339
 340         default:
 341
 342                 /* Shouldn't happen (because of validation earlier), but be sure */
 343
 344                 return (AE_AML_INVALID_RESOURCE_TYPE);
 345         }
 346
 347         /* Optionally return the resource table index */
 348
 349         if (return_index) {
 350                 *return_index = resource_index;
 351         }
 352
 353         return (AE_OK);
 354 }
 355
 356 /*******************************************************************************
 357  *
 358  * FUNCTION:    acpi_ut_get_resource_type
 359  *
 360  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 361  *
 362  * RETURN:      The Resource Type with no extraneous bits (except the
 363  *              Large/Small descriptor bit -- this is left alone)
 364  *
 365  * DESCRIPTION: Extract the Resource Type/Name from the first byte of
 366  *              a resource descriptor.
 367  *
 368  ******************************************************************************/
 369
 370 u8 acpi_ut_get_resource_type(void *aml)
 371 {
 372         ACPI_FUNCTION_ENTRY();
 373
 374         /*
 375          * Byte 0 contains the descriptor name (Resource Type)
 376          * Examine the large/small bit in the resource header
 377          */
 378         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 379                 /* Large Resource Type -- bits 6:0 contain the name */
 380
 381                 return (ACPI_GET8(aml));
 382         } else {
 383                 /* Small Resource Type -- bits 6:3 contain the name */
 384
 385                 return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
 386         }
 387 }
 388
 389 /*******************************************************************************
 390  *
 391  * FUNCTION:    acpi_ut_get_resource_length
 392  *
 393  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 394  *
 395  * RETURN:      Byte Length
 396  *
 397  * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
 398  *              definition, this does not include the size of the descriptor
 399  *              header or the length field itself.
 400  *
 401  ******************************************************************************/
 402
 403 u16 acpi_ut_get_resource_length(void *aml)
 404 {
 405         acpi_rs_length resource_length;
 406
 407         ACPI_FUNCTION_ENTRY();
 408
 409         /*
 410          * Byte 0 contains the descriptor name (Resource Type)
 411          * Examine the large/small bit in the resource header
 412          */
 413         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 414                 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
 415
 416                 ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));
 417
 418         } else {
 419                 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
 420
 421                 resource_length = (u16) (ACPI_GET8(aml) &
 422                                          ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
 423         }
 424
 425         return (resource_length);
 426 }
 427
 428 /*******************************************************************************
 429  *
 430  * FUNCTION:    acpi_ut_get_resource_header_length
 431  *
 432  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 433  *
 434  * RETURN:      Length of the AML header (depends on large/small descriptor)
 435  *
 436  * DESCRIPTION: Get the length of the header for this resource.
 437  *
 438  ******************************************************************************/
 439
 440 u8 acpi_ut_get_resource_header_length(void *aml)
 441 {
 442         ACPI_FUNCTION_ENTRY();
 443
 444         /* Examine the large/small bit in the resource header */
 445
 446         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 447                 return (sizeof(struct aml_resource_large_header));
 448         } else {
 449                 return (sizeof(struct aml_resource_small_header));
 450         }
 451 }
 452
 453 /*******************************************************************************
 454  *
 455  * FUNCTION:    acpi_ut_get_descriptor_length
 456  *
 457  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 458  *
 459  * RETURN:      Byte length
 460  *
 461  * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
 462  *              length of the descriptor header and the length field itself.
 463  *              Used to walk descriptor lists.
 464  *
 465  ******************************************************************************/
 466
 467 u32 acpi_ut_get_descriptor_length(void *aml)
 468 {
 469         ACPI_FUNCTION_ENTRY();
 470
 471         /*
 472          * Get the Resource Length (does not include header length) and add
 473          * the header length (depends on if this is a small or large resource)
 474          */
 475         return (acpi_ut_get_resource_length(aml) +
 476                 acpi_ut_get_resource_header_length(aml));
 477 }
 478
 479 /*******************************************************************************
 480  *
 481  * FUNCTION:    acpi_ut_get_resource_end_tag
 482  *
 483  * PARAMETERS:  obj_desc        - The resource template buffer object
 484  *              end_tag         - Where the pointer to the end_tag is returned
 485  *
 486  * RETURN:      Status, pointer to the end tag
 487  *
 488  * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
 489  *
 490  ******************************************************************************/
 491
 492 acpi_status
 493 acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,
 494                              u8 ** end_tag)
 495 {
 496         acpi_status status;
 497         u8 *aml;
 498         u8 *end_aml;
 499
 500         ACPI_FUNCTION_TRACE("ut_get_resource_end_tag");
 501
 502         /* Get start and end pointers */
 503
 504         aml = obj_desc->buffer.pointer;
 505         end_aml = aml + obj_desc->buffer.length;
 506
 507         /* Walk the resource template, one descriptor per iteration */
 508
 509         while (aml < end_aml) {
 510                 /* Validate the Resource Type and Resource Length */
 511
 512                 status = acpi_ut_validate_resource(aml, NULL);
 513                 if (ACPI_FAILURE(status)) {
 514                         return_ACPI_STATUS(status);
 515                 }
 516
 517                 /* end_tag resource indicates the end of the resource template */
 518
 519                 if (acpi_ut_get_resource_type(aml) ==
 520                     ACPI_RESOURCE_NAME_END_TAG) {
 521                         /* Return the pointer to the end_tag */
 522
 523                         *end_tag = aml;
 524                         return_ACPI_STATUS(AE_OK);
 525                 }
 526
 527                 /*
 528                  * Point to the next resource descriptor in the AML buffer. The
 529                  * descriptor length is guaranteed to be non-zero by resource
 530                  * validation above.
 531                  */
 532                 aml += acpi_ut_get_descriptor_length(aml);
 533         }
 534
 535         /* Did not find an end_tag resource descriptor */
 536
 537         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 538 }