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