git.oblomov.eu 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 - 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
  45 #include <acpi/acpi.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/amlcode.h>
  48
  49
  50 #define _COMPONENT          ACPI_UTILITIES
  51          ACPI_MODULE_NAME    ("utobject")
  52
  53 /* Local prototypes */
  54
  55 static acpi_status
  56 acpi_ut_get_simple_object_size (
  57         union acpi_operand_object       *obj,
  58         acpi_size                       *obj_length);
  59
  60 static acpi_status
  61 acpi_ut_get_package_object_size (
  62         union acpi_operand_object       *obj,
  63         acpi_size                       *obj_length);
  64
  65 static acpi_status
  66 acpi_ut_get_element_length (
  67         u8                              object_type,
  68         union acpi_operand_object       *source_object,
  69         union acpi_generic_state        *state,
  70         void                            *context);
  71
  72
  73 /*******************************************************************************
  74  *
  75  * FUNCTION:    acpi_ut_create_internal_object_dbg
  76  *
  77  * PARAMETERS:  module_name         - Source file name of caller
  78  *              line_number         - Line number of caller
  79  *              component_id        - Component type of caller
  80  *              Type                - ACPI Type of the new object
  81  *
  82  * RETURN:      A new internal object, null on failure
  83  *
  84  * DESCRIPTION: Create and initialize a new internal object.
  85  *
  86  * NOTE:        We always allocate the worst-case object descriptor because
  87  *              these objects are cached, and we want them to be
  88  *              one-size-satisifies-any-request.  This in itself may not be
  89  *              the most memory efficient, but the efficiency of the object
  90  *              cache should more than make up for this!
  91  *
  92  ******************************************************************************/
  93
  94 union acpi_operand_object    *
  95 acpi_ut_create_internal_object_dbg (
  96         char                            *module_name,
  97         u32                             line_number,
  98         u32                             component_id,
  99         acpi_object_type                type)
 100 {
 101         union acpi_operand_object       *object;
 102         union acpi_operand_object       *second_object;
 103
 104
 105         ACPI_FUNCTION_TRACE_STR ("ut_create_internal_object_dbg",
 106                 acpi_ut_get_type_name (type));
 107
 108
 109         /* Allocate the raw object descriptor */
 110
 111         object = acpi_ut_allocate_object_desc_dbg (module_name, line_number, component_id);
 112         if (!object) {
 113                 return_PTR (NULL);
 114         }
 115
 116         switch (type) {
 117         case ACPI_TYPE_REGION:
 118         case ACPI_TYPE_BUFFER_FIELD:
 119
 120                 /* These types require a secondary object */
 121
 122                 second_object = acpi_ut_allocate_object_desc_dbg (module_name,
 123                                    line_number, component_id);
 124                 if (!second_object) {
 125                         acpi_ut_delete_object_desc (object);
 126                         return_PTR (NULL);
 127                 }
 128
 129                 second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;
 130                 second_object->common.reference_count = 1;
 131
 132                 /* Link the second object to the first */
 133
 134                 object->common.next_object = second_object;
 135                 break;
 136
 137         default:
 138                 /* All others have no secondary object */
 139                 break;
 140         }
 141
 142         /* Save the object type in the object descriptor */
 143
 144         object->common.type = (u8) type;
 145
 146         /* Init the reference count */
 147
 148         object->common.reference_count = 1;
 149
 150         /* Any per-type initialization should go here */
 151
 152         return_PTR (object);
 153 }
 154
 155
 156 /*******************************************************************************
 157  *
 158  * FUNCTION:    acpi_ut_create_buffer_object
 159  *
 160  * PARAMETERS:  buffer_size            - Size of buffer to be created
 161  *
 162  * RETURN:      Pointer to a new Buffer object, null on failure
 163  *
 164  * DESCRIPTION: Create a fully initialized buffer object
 165  *
 166  ******************************************************************************/
 167
 168 union acpi_operand_object *
 169 acpi_ut_create_buffer_object (
 170         acpi_size                       buffer_size)
 171 {
 172         union acpi_operand_object       *buffer_desc;
 173         u8                              *buffer = NULL;
 174
 175
 176         ACPI_FUNCTION_TRACE_U32 ("ut_create_buffer_object", buffer_size);
 177
 178
 179         /* Create a new Buffer object */
 180
 181         buffer_desc = acpi_ut_create_internal_object (ACPI_TYPE_BUFFER);
 182         if (!buffer_desc) {
 183                 return_PTR (NULL);
 184         }
 185
 186         /* Create an actual buffer only if size > 0 */
 187
 188         if (buffer_size > 0) {
 189                 /* Allocate the actual buffer */
 190
 191                 buffer = ACPI_MEM_CALLOCATE (buffer_size);
 192                 if (!buffer) {
 193                         ACPI_REPORT_ERROR (("create_buffer: could not allocate size %X\n",
 194                                 (u32) buffer_size));
 195                         acpi_ut_remove_reference (buffer_desc);
 196                         return_PTR (NULL);
 197                 }
 198         }
 199
 200         /* Complete buffer object initialization */
 201
 202         buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;
 203         buffer_desc->buffer.pointer = buffer;
 204         buffer_desc->buffer.length = (u32) buffer_size;
 205
 206         /* Return the new buffer descriptor */
 207
 208         return_PTR (buffer_desc);
 209 }
 210
 211
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_ut_create_string_object
 215  *
 216  * PARAMETERS:  string_size         - Size of string to be created. Does not
 217  *                                    include NULL terminator, this is added
 218  *                                    automatically.
 219  *
 220  * RETURN:      Pointer to a new String object
 221  *
 222  * DESCRIPTION: Create a fully initialized string object
 223  *
 224  ******************************************************************************/
 225
 226 union acpi_operand_object *
 227 acpi_ut_create_string_object (
 228         acpi_size                       string_size)
 229 {
 230         union acpi_operand_object       *string_desc;
 231         char                            *string;
 232
 233
 234         ACPI_FUNCTION_TRACE_U32 ("ut_create_string_object", string_size);
 235
 236
 237         /* Create a new String object */
 238
 239         string_desc = acpi_ut_create_internal_object (ACPI_TYPE_STRING);
 240         if (!string_desc) {
 241                 return_PTR (NULL);
 242         }
 243
 244         /*
 245          * Allocate the actual string buffer -- (Size + 1) for NULL terminator.
 246          * NOTE: Zero-length strings are NULL terminated
 247          */
 248         string = ACPI_MEM_CALLOCATE (string_size + 1);
 249         if (!string) {
 250                 ACPI_REPORT_ERROR (("create_string: could not allocate size %X\n",
 251                         (u32) string_size));
 252                 acpi_ut_remove_reference (string_desc);
 253                 return_PTR (NULL);
 254         }
 255
 256         /* Complete string object initialization */
 257
 258         string_desc->string.pointer = string;
 259         string_desc->string.length = (u32) string_size;
 260
 261         /* Return the new string descriptor */
 262
 263         return_PTR (string_desc);
 264 }
 265
 266
 267 /*******************************************************************************
 268  *
 269  * FUNCTION:    acpi_ut_valid_internal_object
 270  *
 271  * PARAMETERS:  Object              - Object to be validated
 272  *
 273  * RETURN:      TRUE if object is valid, FALSE otherwise
 274  *
 275  * DESCRIPTION: Validate a pointer to be an union acpi_operand_object
 276  *
 277  ******************************************************************************/
 278
 279 u8
 280 acpi_ut_valid_internal_object (
 281         void                            *object)
 282 {
 283
 284         ACPI_FUNCTION_NAME ("ut_valid_internal_object");
 285
 286
 287         /* Check for a null pointer */
 288
 289         if (!object) {
 290                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "**** Null Object Ptr\n"));
 291                 return (FALSE);
 292         }
 293
 294         /* Check the descriptor type field */
 295
 296         switch (ACPI_GET_DESCRIPTOR_TYPE (object)) {
 297         case ACPI_DESC_TYPE_OPERAND:
 298
 299                 /* The object appears to be a valid union acpi_operand_object    */
 300
 301                 return (TRUE);
 302
 303         default:
 304                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 305                                 "%p is not not an ACPI operand obj [%s]\n",
 306                                 object, acpi_ut_get_descriptor_name (object)));
 307                 break;
 308         }
 309
 310         return (FALSE);
 311 }
 312
 313
 314 /*******************************************************************************
 315  *
 316  * FUNCTION:    acpi_ut_allocate_object_desc_dbg
 317  *
 318  * PARAMETERS:  module_name         - Caller's module name (for error output)
 319  *              line_number         - Caller's line number (for error output)
 320  *              component_id        - Caller's component ID (for error output)
 321  *
 322  * RETURN:      Pointer to newly allocated object descriptor.  Null on error
 323  *
 324  * DESCRIPTION: Allocate a new object descriptor.  Gracefully handle
 325  *              error conditions.
 326  *
 327  ******************************************************************************/
 328
 329 void *
 330 acpi_ut_allocate_object_desc_dbg (
 331         char                            *module_name,
 332         u32                             line_number,
 333         u32                             component_id)
 334 {
 335         union acpi_operand_object       *object;
 336
 337
 338         ACPI_FUNCTION_TRACE ("ut_allocate_object_desc_dbg");
 339
 340
 341         object = acpi_ut_acquire_from_cache (ACPI_MEM_LIST_OPERAND);
 342         if (!object) {
 343                 _ACPI_REPORT_ERROR (module_name, line_number, component_id,
 344                                   ("Could not allocate an object descriptor\n"));
 345
 346                 return_PTR (NULL);
 347         }
 348
 349         /* Mark the descriptor type */
 350
 351         ACPI_SET_DESCRIPTOR_TYPE (object, ACPI_DESC_TYPE_OPERAND);
 352
 353         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
 354                         object, (u32) sizeof (union acpi_operand_object)));
 355
 356         return_PTR (object);
 357 }
 358
 359
 360 /*******************************************************************************
 361  *
 362  * FUNCTION:    acpi_ut_delete_object_desc
 363  *
 364  * PARAMETERS:  Object          - An Acpi internal object to be deleted
 365  *
 366  * RETURN:      None.
 367  *
 368  * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
 369  *
 370  ******************************************************************************/
 371
 372 void
 373 acpi_ut_delete_object_desc (
 374         union acpi_operand_object       *object)
 375 {
 376         ACPI_FUNCTION_TRACE_PTR ("ut_delete_object_desc", object);
 377
 378
 379         /* Object must be an union acpi_operand_object    */
 380
 381         if (ACPI_GET_DESCRIPTOR_TYPE (object) != ACPI_DESC_TYPE_OPERAND) {
 382                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 383                                 "%p is not an ACPI Operand object [%s]\n", object,
 384                                 acpi_ut_get_descriptor_name (object)));
 385                 return_VOID;
 386         }
 387
 388         acpi_ut_release_to_cache (ACPI_MEM_LIST_OPERAND, object);
 389
 390         return_VOID;
 391 }
 392
 393
 394 #ifdef ACPI_ENABLE_OBJECT_CACHE
 395 /*******************************************************************************
 396  *
 397  * FUNCTION:    acpi_ut_delete_object_cache
 398  *
 399  * PARAMETERS:  None
 400  *
 401  * RETURN:      None
 402  *
 403  * DESCRIPTION: Purge the global state object cache.  Used during subsystem
 404  *              termination.
 405  *
 406  ******************************************************************************/
 407
 408 void
 409 acpi_ut_delete_object_cache (
 410         void)
 411 {
 412         ACPI_FUNCTION_TRACE ("ut_delete_object_cache");
 413
 414
 415         acpi_ut_delete_generic_cache (ACPI_MEM_LIST_OPERAND);
 416         return_VOID;
 417 }
 418 #endif
 419
 420
 421 /*******************************************************************************
 422  *
 423  * FUNCTION:    acpi_ut_get_simple_object_size
 424  *
 425  * PARAMETERS:  internal_object    - An ACPI operand object
 426  *              obj_length         - Where the length is returned
 427  *
 428  * RETURN:      Status
 429  *
 430  * DESCRIPTION: This function is called to determine the space required to
 431  *              contain a simple object for return to an external user.
 432  *
 433  *              The length includes the object structure plus any additional
 434  *              needed space.
 435  *
 436  ******************************************************************************/
 437
 438 static acpi_status
 439 acpi_ut_get_simple_object_size (
 440         union acpi_operand_object       *internal_object,
 441         acpi_size                       *obj_length)
 442 {
 443         acpi_size                       length;
 444         acpi_status                     status = AE_OK;
 445
 446
 447         ACPI_FUNCTION_TRACE_PTR ("ut_get_simple_object_size", internal_object);
 448
 449
 450         /*
 451          * Handle a null object (Could be a uninitialized package
 452          * element -- which is legal)
 453          */
 454         if (!internal_object) {
 455                 *obj_length = 0;
 456                 return_ACPI_STATUS (AE_OK);
 457         }
 458
 459         /* Start with the length of the Acpi object */
 460
 461         length = sizeof (union acpi_object);
 462
 463         if (ACPI_GET_DESCRIPTOR_TYPE (internal_object) == ACPI_DESC_TYPE_NAMED) {
 464                 /* Object is a named object (reference), just return the length */
 465
 466                 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD (length);
 467                 return_ACPI_STATUS (status);
 468         }
 469
 470         /*
 471          * The final length depends on the object type
 472          * Strings and Buffers are packed right up against the parent object and
 473          * must be accessed bytewise or there may be alignment problems on
 474          * certain processors
 475          */
 476         switch (ACPI_GET_OBJECT_TYPE (internal_object)) {
 477         case ACPI_TYPE_STRING:
 478
 479                 length += (acpi_size) internal_object->string.length + 1;
 480                 break;
 481
 482
 483         case ACPI_TYPE_BUFFER:
 484
 485                 length += (acpi_size) internal_object->buffer.length;
 486                 break;
 487
 488
 489         case ACPI_TYPE_INTEGER:
 490         case ACPI_TYPE_PROCESSOR:
 491         case ACPI_TYPE_POWER:
 492
 493                 /*
 494                  * No extra data for these types
 495                  */
 496                 break;
 497
 498
 499         case ACPI_TYPE_LOCAL_REFERENCE:
 500
 501                 switch (internal_object->reference.opcode) {
 502                 case AML_INT_NAMEPATH_OP:
 503
 504                         /*
 505                          * Get the actual length of the full pathname to this object.
 506                          * The reference will be converted to the pathname to the object
 507                          */
 508                         length += ACPI_ROUND_UP_TO_NATIVE_WORD (
 509                                          acpi_ns_get_pathname_length (internal_object->reference.node));
 510                         break;
 511
 512                 default:
 513
 514                         /*
 515                          * No other reference opcodes are supported.
 516                          * Notably, Locals and Args are not supported, but this may be
 517                          * required eventually.
 518                          */
 519                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 520                                 "Unsupported Reference opcode=%X in object %p\n",
 521                                 internal_object->reference.opcode, internal_object));
 522                         status = AE_TYPE;
 523                         break;
 524                 }
 525                 break;
 526
 527
 528         default:
 529
 530                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unsupported type=%X in object %p\n",
 531                         ACPI_GET_OBJECT_TYPE (internal_object), internal_object));
 532                 status = AE_TYPE;
 533                 break;
 534         }
 535
 536         /*
 537          * Account for the space required by the object rounded up to the next
 538          * multiple of the machine word size.  This keeps each object aligned
 539          * on a machine word boundary. (preventing alignment faults on some
 540          * machines.)
 541          */
 542         *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD (length);
 543         return_ACPI_STATUS (status);
 544 }
 545
 546
 547 /*******************************************************************************
 548  *
 549  * FUNCTION:    acpi_ut_get_element_length
 550  *
 551  * PARAMETERS:  acpi_pkg_callback
 552  *
 553  * RETURN:      Status
 554  *
 555  * DESCRIPTION: Get the length of one package element.
 556  *
 557  ******************************************************************************/
 558
 559 static acpi_status
 560 acpi_ut_get_element_length (
 561         u8                              object_type,
 562         union acpi_operand_object       *source_object,
 563         union acpi_generic_state        *state,
 564         void                            *context)
 565 {
 566         acpi_status                     status = AE_OK;
 567         struct acpi_pkg_info            *info = (struct acpi_pkg_info *) context;
 568         acpi_size                       object_space;
 569
 570
 571         switch (object_type) {
 572         case ACPI_COPY_TYPE_SIMPLE:
 573
 574                 /*
 575                  * Simple object - just get the size (Null object/entry is handled
 576                  * here also) and sum it into the running package length
 577                  */
 578                 status = acpi_ut_get_simple_object_size (source_object, &object_space);
 579                 if (ACPI_FAILURE (status)) {
 580                         return (status);
 581                 }
 582
 583                 info->length += object_space;
 584                 break;
 585
 586
 587         case ACPI_COPY_TYPE_PACKAGE:
 588
 589                 /* Package object - nothing much to do here, let the walk handle it */
 590
 591                 info->num_packages++;
 592                 state->pkg.this_target_obj = NULL;
 593                 break;
 594
 595
 596         default:
 597
 598                 /* No other types allowed */
 599
 600                 return (AE_BAD_PARAMETER);
 601         }
 602
 603         return (status);
 604 }
 605
 606
 607 /*******************************************************************************
 608  *
 609  * FUNCTION:    acpi_ut_get_package_object_size
 610  *
 611  * PARAMETERS:  internal_object     - An ACPI internal object
 612  *              obj_length          - Where the length is returned
 613  *
 614  * RETURN:      Status
 615  *
 616  * DESCRIPTION: This function is called to determine the space required to
 617  *              contain a package object for return to an external user.
 618  *
 619  *              This is moderately complex since a package contains other
 620  *              objects including packages.
 621  *
 622  ******************************************************************************/
 623
 624 static acpi_status
 625 acpi_ut_get_package_object_size (
 626         union acpi_operand_object       *internal_object,
 627         acpi_size                       *obj_length)
 628 {
 629         acpi_status                     status;
 630         struct acpi_pkg_info            info;
 631
 632
 633         ACPI_FUNCTION_TRACE_PTR ("ut_get_package_object_size", internal_object);
 634
 635
 636         info.length      = 0;
 637         info.object_space = 0;
 638         info.num_packages = 1;
 639
 640         status = acpi_ut_walk_package_tree (internal_object, NULL,
 641                          acpi_ut_get_element_length, &info);
 642         if (ACPI_FAILURE (status)) {
 643                 return_ACPI_STATUS (status);
 644         }
 645
 646         /*
 647          * We have handled all of the objects in all levels of the package.
 648          * just add the length of the package objects themselves.
 649          * Round up to the next machine word.
 650          */
 651         info.length += ACPI_ROUND_UP_TO_NATIVE_WORD (sizeof (union acpi_object)) *
 652                           (acpi_size) info.num_packages;
 653
 654         /* Return the total package length */
 655
 656         *obj_length = info.length;
 657         return_ACPI_STATUS (status);
 658 }
 659
 660
 661 /*******************************************************************************
 662  *
 663  * FUNCTION:    acpi_ut_get_object_size
 664  *
 665  * PARAMETERS:  internal_object     - An ACPI internal object
 666  *              obj_length          - Where the length will be returned
 667  *
 668  * RETURN:      Status
 669  *
 670  * DESCRIPTION: This function is called to determine the space required to
 671  *              contain an object for return to an API user.
 672  *
 673  ******************************************************************************/
 674
 675 acpi_status
 676 acpi_ut_get_object_size (
 677         union acpi_operand_object       *internal_object,
 678         acpi_size                       *obj_length)
 679 {
 680         acpi_status                     status;
 681
 682
 683         ACPI_FUNCTION_ENTRY ();
 684
 685
 686         if ((ACPI_GET_DESCRIPTOR_TYPE (internal_object) == ACPI_DESC_TYPE_OPERAND) &&
 687                 (ACPI_GET_OBJECT_TYPE (internal_object) == ACPI_TYPE_PACKAGE)) {
 688                 status = acpi_ut_get_package_object_size (internal_object, obj_length);
 689         }
 690         else {
 691                 status = acpi_ut_get_simple_object_size (internal_object, obj_length);
 692         }
 693
 694         return (status);
 695 }
 696
 697