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