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

   1 /******************************************************************************
   2  *
   3  * Module Name: utobject - ACPI object create/delete/size/cache routines
   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/acnamesp.h>
  46 #include <acpi/amlcode.h>
  47
  48 #define _COMPONENT          ACPI_UTILITIES
  49 ACPI_MODULE_NAME("utobject")
  50
  51 /* Local prototypes */
  52 static acpi_status
  53 acpi_ut_get_simple_object_size(union acpi_operand_object *obj,
  54                                acpi_size * obj_length);
  55
  56 static acpi_status
  57 acpi_ut_get_package_object_size(union acpi_operand_object *obj,
  58                                 acpi_size * obj_length);
  59
  60 static acpi_status
  61 acpi_ut_get_element_length(u8 object_type,
  62                            union acpi_operand_object *source_object,
  63                            union acpi_generic_state *state, void *context);
  64
  65 /*******************************************************************************
  66  *
  67  * FUNCTION:    acpi_ut_create_internal_object_dbg
  68  *
  69  * PARAMETERS:  module_name         - Source file name of caller
  70  *              line_number         - Line number of caller
  71  *              component_id        - Component type of caller
  72  *              Type                - ACPI Type of the new object
  73  *
  74  * RETURN:      A new internal object, null on failure
  75  *
  76  * DESCRIPTION: Create and initialize a new internal object.
  77  *
  78  * NOTE:        We always allocate the worst-case object descriptor because
  79  *              these objects are cached, and we want them to be
  80  *              one-size-satisifies-any-request.  This in itself may not be
  81  *              the most memory efficient, but the efficiency of the object
  82  *              cache should more than make up for this!
  83  *
  84  ******************************************************************************/
  85
  86 union acpi_operand_object *acpi_ut_create_internal_object_dbg(const char
  87                                                               *module_name,
  88                                                               u32 line_number,
  89                                                               u32 component_id,
  90                                                               acpi_object_type
  91                                                               type)
  92 {
  93         union acpi_operand_object *object;
  94         union acpi_operand_object *second_object;
  95
  96         ACPI_FUNCTION_TRACE_STR(ut_create_internal_object_dbg,
  97                                 acpi_ut_get_type_name(type));
  98
  99         /* Allocate the raw object descriptor */
 100
 101         object =
 102             acpi_ut_allocate_object_desc_dbg(module_name, line_number,
 103                                              component_id);
 104         if (!object) {
 105                 return_PTR(NULL);
 106         }
 107
 108         switch (type) {
 109         case ACPI_TYPE_REGION:
 110         case ACPI_TYPE_BUFFER_FIELD:
 111         case ACPI_TYPE_LOCAL_BANK_FIELD:
 112
 113                 /* These types require a secondary object */
 114
 115                 second_object = acpi_ut_allocate_object_desc_dbg(module_name,
 116                                                                  line_number,
 117                                                                  component_id);
 118                 if (!second_object) {
 119                         acpi_ut_delete_object_desc(object);
 120                         return_PTR(NULL);
 121                 }
 122
 123                 second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;
 124                 second_object->common.reference_count = 1;
 125
 126                 /* Link the second object to the first */
 127
 128                 object->common.next_object = second_object;
 129                 break;
 130
 131         default:
 132                 /* All others have no secondary object */
 133                 break;
 134         }
 135
 136         /* Save the object type in the object descriptor */
 137
 138         object->common.type = (u8) type;
 139
 140         /* Init the reference count */
 141
 142         object->common.reference_count = 1;
 143
 144         /* Any per-type initialization should go here */
 145
 146         return_PTR(object);
 147 }
 148
 149 /*******************************************************************************
 150  *
 151  * FUNCTION:    acpi_ut_create_package_object
 152  *
 153  * PARAMETERS:  Count               - Number of package elements
 154  *
 155  * RETURN:      Pointer to a new Package object, null on failure
 156  *
 157  * DESCRIPTION: Create a fully initialized package object
 158  *
 159  ******************************************************************************/
 160
 161 union acpi_operand_object *acpi_ut_create_package_object(u32 count)
 162 {
 163         union acpi_operand_object *package_desc;
 164         union acpi_operand_object **package_elements;
 165
 166         ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count);
 167
 168         /* Create a new Package object */
 169
 170         package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
 171         if (!package_desc) {
 172                 return_PTR(NULL);
 173         }
 174
 175         /*
 176          * Create the element array. Count+1 allows the array to be null
 177          * terminated.
 178          */
 179         package_elements = ACPI_ALLOCATE_ZEROED(((acpi_size) count +
 180                                                  1) * sizeof(void *));
 181         if (!package_elements) {
 182                 acpi_ut_remove_reference(package_desc);
 183                 return_PTR(NULL);
 184         }
 185
 186         package_desc->package.count = count;
 187         package_desc->package.elements = package_elements;
 188         return_PTR(package_desc);
 189 }
 190
 191 /*******************************************************************************
 192  *
 193  * FUNCTION:    acpi_ut_create_buffer_object
 194  *
 195  * PARAMETERS:  buffer_size            - Size of buffer to be created
 196  *
 197  * RETURN:      Pointer to a new Buffer object, null on failure
 198  *
 199  * DESCRIPTION: Create a fully initialized buffer object
 200  *
 201  ******************************************************************************/
 202
 203 union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size)
 204 {
 205         union acpi_operand_object *buffer_desc;
 206         u8 *buffer = NULL;
 207
 208         ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size);
 209
 210         /* Create a new Buffer object */
 211
 212         buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
 213         if (!buffer_desc) {
 214                 return_PTR(NULL);
 215         }
 216
 217         /* Create an actual buffer only if size > 0 */
 218
 219         if (buffer_size > 0) {
 220
 221                 /* Allocate the actual buffer */
 222
 223                 buffer = ACPI_ALLOCATE_ZEROED(buffer_size);
 224                 if (!buffer) {
 225                         ACPI_ERROR((AE_INFO, "Could not allocate size %X",
 226                                     (u32) buffer_size));
 227                         acpi_ut_remove_reference(buffer_desc);
 228                         return_PTR(NULL);
 229                 }
 230         }
 231
 232         /* Complete buffer object initialization */
 233
 234         buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;
 235         buffer_desc->buffer.pointer = buffer;
 236         buffer_desc->buffer.length = (u32) buffer_size;
 237
 238         /* Return the new buffer descriptor */
 239
 240         return_PTR(buffer_desc);
 241 }
 242
 243 /*******************************************************************************
 244  *
 245  * FUNCTION:    acpi_ut_create_string_object
 246  *
 247  * PARAMETERS:  string_size         - Size of string to be created. Does not
 248  *                                    include NULL terminator, this is added
 249  *                                    automatically.
 250  *
 251  * RETURN:      Pointer to a new String object
 252  *
 253  * DESCRIPTION: Create a fully initialized string object
 254  *
 255  ******************************************************************************/
 256
 257 union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size)
 258 {
 259         union acpi_operand_object *string_desc;
 260         char *string;
 261
 262         ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size);
 263
 264         /* Create a new String object */
 265
 266         string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING);
 267         if (!string_desc) {
 268                 return_PTR(NULL);
 269         }
 270
 271         /*
 272          * Allocate the actual string buffer -- (Size + 1) for NULL terminator.
 273          * NOTE: Zero-length strings are NULL terminated
 274          */
 275         string = ACPI_ALLOCATE_ZEROED(string_size + 1);
 276         if (!string) {
 277                 ACPI_ERROR((AE_INFO, "Could not allocate size %X",
 278                             (u32) string_size));
 279                 acpi_ut_remove_reference(string_desc);
 280                 return_PTR(NULL);
 281         }
 282
 283         /* Complete string object initialization */
 284
 285         string_desc->string.pointer = string;
 286         string_desc->string.length = (u32) string_size;
 287
 288         /* Return the new string descriptor */
 289
 290         return_PTR(string_desc);
 291 }
 292
 293 /*******************************************************************************
 294  *
 295  * FUNCTION:    acpi_ut_valid_internal_object
 296  *
 297  * PARAMETERS:  Object              - Object to be validated
 298  *
 299  * RETURN:      TRUE if object is valid, FALSE otherwise
 300  *
 301  * DESCRIPTION: Validate a pointer to be an union acpi_operand_object
 302  *
 303  ******************************************************************************/
 304
 305 u8 acpi_ut_valid_internal_object(void *object)
 306 {
 307
 308         ACPI_FUNCTION_NAME(ut_valid_internal_object);
 309
 310         /* Check for a null pointer */
 311
 312         if (!object) {
 313                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "**** Null Object Ptr\n"));
 314                 return (FALSE);
 315         }
 316
 317         /* Check the descriptor type field */
 318
 319         switch (ACPI_GET_DESCRIPTOR_TYPE(object)) {
 320         case ACPI_DESC_TYPE_OPERAND:
 321
 322                 /* The object appears to be a valid union acpi_operand_object    */
 323
 324                 return (TRUE);
 325
 326         default:
 327                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 328                                   "%p is not not an ACPI operand obj [%s]\n",
 329                                   object, acpi_ut_get_descriptor_name(object)));
 330                 break;
 331         }
 332
 333         return (FALSE);
 334 }
 335
 336 /*******************************************************************************
 337  *
 338  * FUNCTION:    acpi_ut_allocate_object_desc_dbg
 339  *
 340  * PARAMETERS:  module_name         - Caller's module name (for error output)
 341  *              line_number         - Caller's line number (for error output)
 342  *              component_id        - Caller's component ID (for error output)
 343  *
 344  * RETURN:      Pointer to newly allocated object descriptor.  Null on error
 345  *
 346  * DESCRIPTION: Allocate a new object descriptor.  Gracefully handle
 347  *              error conditions.
 348  *
 349  ******************************************************************************/
 350
 351 void *acpi_ut_allocate_object_desc_dbg(const char *module_name,
 352                                        u32 line_number, u32 component_id)
 353 {
 354         union acpi_operand_object *object;
 355
 356         ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg);
 357
 358         object = acpi_os_acquire_object(acpi_gbl_operand_cache);
 359         if (!object) {
 360                 ACPI_ERROR((module_name, line_number,
 361                             "Could not allocate an object descriptor"));
 362
 363                 return_PTR(NULL);
 364         }
 365
 366         /* Mark the descriptor type */
 367
 368         memset(object, 0, sizeof(union acpi_operand_object));
 369         ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND);
 370
 371         ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
 372                           object, (u32) sizeof(union acpi_operand_object)));
 373
 374         return_PTR(object);
 375 }
 376
 377 /*******************************************************************************
 378  *
 379  * FUNCTION:    acpi_ut_delete_object_desc
 380  *
 381  * PARAMETERS:  Object          - An Acpi internal object to be deleted
 382  *
 383  * RETURN:      None.
 384  *
 385  * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
 386  *
 387  ******************************************************************************/
 388
 389 void acpi_ut_delete_object_desc(union acpi_operand_object *object)
 390 {
 391         ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object);
 392
 393         /* Object must be an union acpi_operand_object    */
 394
 395         if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) {
 396                 ACPI_ERROR((AE_INFO,
 397                             "%p is not an ACPI Operand object [%s]", object,
 398                             acpi_ut_get_descriptor_name(object)));
 399                 return_VOID;
 400         }
 401
 402         (void)acpi_os_release_object(acpi_gbl_operand_cache, object);
 403         return_VOID;
 404 }
 405
 406 /*******************************************************************************
 407  *
 408  * FUNCTION:    acpi_ut_get_simple_object_size
 409  *
 410  * PARAMETERS:  internal_object    - An ACPI operand object
 411  *              obj_length         - Where the length is returned
 412  *
 413  * RETURN:      Status
 414  *
 415  * DESCRIPTION: This function is called to determine the space required to
 416  *              contain a simple object for return to an external user.
 417  *
 418  *              The length includes the object structure plus any additional
 419  *              needed space.
 420  *
 421  ******************************************************************************/
 422
 423 static acpi_status
 424 acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object,
 425                                acpi_size * obj_length)
 426 {
 427         acpi_size length;
 428         acpi_status status = AE_OK;
 429
 430         ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object);
 431
 432         /*
 433          * Handle a null object (Could be a uninitialized package
 434          * element -- which is legal)
 435          */
 436         if (!internal_object) {
 437                 *obj_length = sizeof(union acpi_object);
 438                 return_ACPI_STATUS(AE_OK);
 439         }
 440
 441         /* Start with the length of the Acpi object */
 442
 443         length = sizeof(union acpi_object);
 444
 445         if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) {
 446
 447                 /* Object is a named object (reference), just return the length */
 448
 449                 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
 450                 return_ACPI_STATUS(status);
 451         }
 452
 453         /*
 454          * The final length depends on the object type
 455          * Strings and Buffers are packed right up against the parent object and
 456          * must be accessed bytewise or there may be alignment problems on
 457          * certain processors
 458          */
 459         switch (ACPI_GET_OBJECT_TYPE(internal_object)) {
 460         case ACPI_TYPE_STRING:
 461
 462                 length += (acpi_size) internal_object->string.length + 1;
 463                 break;
 464
 465         case ACPI_TYPE_BUFFER:
 466
 467                 length += (acpi_size) internal_object->buffer.length;
 468                 break;
 469
 470         case ACPI_TYPE_INTEGER:
 471         case ACPI_TYPE_PROCESSOR:
 472         case ACPI_TYPE_POWER:
 473
 474                 /* No extra data for these types */
 475
 476                 break;
 477
 478         case ACPI_TYPE_LOCAL_REFERENCE:
 479
 480                 switch (internal_object->reference.opcode) {
 481                 case AML_INT_NAMEPATH_OP:
 482
 483                         /*
 484                          * Get the actual length of the full pathname to this object.
 485                          * The reference will be converted to the pathname to the object
 486                          */
 487                         length +=
 488                             ACPI_ROUND_UP_TO_NATIVE_WORD
 489                             (acpi_ns_get_pathname_length
 490                              (internal_object->reference.node));
 491                         break;
 492
 493                 default:
 494
 495                         /*
 496                          * No other reference opcodes are supported.
 497                          * Notably, Locals and Args are not supported, but this may be
 498                          * required eventually.
 499                          */
 500                         ACPI_ERROR((AE_INFO,
 501                                     "Unsupported Reference opcode=%X in object %p",
 502                                     internal_object->reference.opcode,
 503                                     internal_object));
 504                         status = AE_TYPE;
 505                         break;
 506                 }
 507                 break;
 508
 509         default:
 510
 511                 ACPI_ERROR((AE_INFO, "Unsupported type=%X in object %p",
 512                             ACPI_GET_OBJECT_TYPE(internal_object),
 513                             internal_object));
 514                 status = AE_TYPE;
 515                 break;
 516         }
 517
 518         /*
 519          * Account for the space required by the object rounded up to the next
 520          * multiple of the machine word size.  This keeps each object aligned
 521          * on a machine word boundary. (preventing alignment faults on some
 522          * machines.)
 523          */
 524         *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
 525         return_ACPI_STATUS(status);
 526 }
 527
 528 /*******************************************************************************
 529  *
 530  * FUNCTION:    acpi_ut_get_element_length
 531  *
 532  * PARAMETERS:  acpi_pkg_callback
 533  *
 534  * RETURN:      Status
 535  *
 536  * DESCRIPTION: Get the length of one package element.
 537  *
 538  ******************************************************************************/
 539
 540 static acpi_status
 541 acpi_ut_get_element_length(u8 object_type,
 542                            union acpi_operand_object *source_object,
 543                            union acpi_generic_state *state, void *context)
 544 {
 545         acpi_status status = AE_OK;
 546         struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
 547         acpi_size object_space;
 548
 549         switch (object_type) {
 550         case ACPI_COPY_TYPE_SIMPLE:
 551
 552                 /*
 553                  * Simple object - just get the size (Null object/entry is handled
 554                  * here also) and sum it into the running package length
 555                  */
 556                 status =
 557                     acpi_ut_get_simple_object_size(source_object,
 558                                                    &object_space);
 559                 if (ACPI_FAILURE(status)) {
 560                         return (status);
 561                 }
 562
 563                 info->length += object_space;
 564                 break;
 565
 566         case ACPI_COPY_TYPE_PACKAGE:
 567
 568                 /* Package object - nothing much to do here, let the walk handle it */
 569
 570                 info->num_packages++;
 571                 state->pkg.this_target_obj = NULL;
 572                 break;
 573
 574         default:
 575
 576                 /* No other types allowed */
 577
 578                 return (AE_BAD_PARAMETER);
 579         }
 580
 581         return (status);
 582 }
 583
 584 /*******************************************************************************
 585  *
 586  * FUNCTION:    acpi_ut_get_package_object_size
 587  *
 588  * PARAMETERS:  internal_object     - An ACPI internal object
 589  *              obj_length          - Where the length is returned
 590  *
 591  * RETURN:      Status
 592  *
 593  * DESCRIPTION: This function is called to determine the space required to
 594  *              contain a package object for return to an external user.
 595  *
 596  *              This is moderately complex since a package contains other
 597  *              objects including packages.
 598  *
 599  ******************************************************************************/
 600
 601 static acpi_status
 602 acpi_ut_get_package_object_size(union acpi_operand_object *internal_object,
 603                                 acpi_size * obj_length)
 604 {
 605         acpi_status status;
 606         struct acpi_pkg_info info;
 607
 608         ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object);
 609
 610         info.length = 0;
 611         info.object_space = 0;
 612         info.num_packages = 1;
 613
 614         status = acpi_ut_walk_package_tree(internal_object, NULL,
 615                                            acpi_ut_get_element_length, &info);
 616         if (ACPI_FAILURE(status)) {
 617                 return_ACPI_STATUS(status);
 618         }
 619
 620         /*
 621          * We have handled all of the objects in all levels of the package.
 622          * just add the length of the package objects themselves.
 623          * Round up to the next machine word.
 624          */
 625         info.length += ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) *
 626             (acpi_size) info.num_packages;
 627
 628         /* Return the total package length */
 629
 630         *obj_length = info.length;
 631         return_ACPI_STATUS(status);
 632 }
 633
 634 /*******************************************************************************
 635  *
 636  * FUNCTION:    acpi_ut_get_object_size
 637  *
 638  * PARAMETERS:  internal_object     - An ACPI internal object
 639  *              obj_length          - Where the length will be returned
 640  *
 641  * RETURN:      Status
 642  *
 643  * DESCRIPTION: This function is called to determine the space required to
 644  *              contain an object for return to an API user.
 645  *
 646  ******************************************************************************/
 647
 648 acpi_status
 649 acpi_ut_get_object_size(union acpi_operand_object *internal_object,
 650                         acpi_size * obj_length)
 651 {
 652         acpi_status status;
 653
 654         ACPI_FUNCTION_ENTRY();
 655
 656         if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) ==
 657              ACPI_DESC_TYPE_OPERAND)
 658             && (ACPI_GET_OBJECT_TYPE(internal_object) == ACPI_TYPE_PACKAGE)) {
 659                 status =
 660                     acpi_ut_get_package_object_size(internal_object,
 661                                                     obj_length);
 662         } else {
 663                 status =
 664                     acpi_ut_get_simple_object_size(internal_object, obj_length);
 665         }
 666
 667         return (status);
 668 }