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