drivers/acpi/dispatcher/dsobject.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsobject - Dispatcher object management routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, 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/acparser.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acdispat.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acinterp.h>
  50
  51 #define _COMPONENT          ACPI_DISPATCHER
  52 ACPI_MODULE_NAME("dsobject")
  53
  54 /* Local prototypes */
  55 static acpi_status
  56 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
  57                               union acpi_parse_object *op,
  58                               union acpi_operand_object **obj_desc_ptr);
  59
  60 #ifndef ACPI_NO_METHOD_EXECUTION
  61 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_ds_build_internal_object
  64  *
  65  * PARAMETERS:  walk_state      - Current walk state
  66  *              Op              - Parser object to be translated
  67  *              obj_desc_ptr    - Where the ACPI internal object is returned
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: Translate a parser Op object to the equivalent namespace object
  72  *              Simple objects are any objects other than a package object!
  73  *
  74  ******************************************************************************/
  75
  76 static acpi_status
  77 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
  78                               union acpi_parse_object *op,
  79                               union acpi_operand_object **obj_desc_ptr)
  80 {
  81         union acpi_operand_object *obj_desc;
  82         acpi_status status;
  83
  84         ACPI_FUNCTION_TRACE("ds_build_internal_object");
  85
  86         *obj_desc_ptr = NULL;
  87         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
  88                 /*
  89                  * This is a named object reference. If this name was
  90                  * previously looked up in the namespace, it was stored in this op.
  91                  * Otherwise, go ahead and look it up now
  92                  */
  93                 if (!op->common.node) {
  94                         status = acpi_ns_lookup(walk_state->scope_info,
  95                                                 op->common.value.string,
  96                                                 ACPI_TYPE_ANY,
  97                                                 ACPI_IMODE_EXECUTE,
  98                                                 ACPI_NS_SEARCH_PARENT |
  99                                                 ACPI_NS_DONT_OPEN_SCOPE, NULL,
 100                                                 ACPI_CAST_INDIRECT_PTR(struct
 101                                                                        acpi_namespace_node,
 102                                                                        &(op->
 103                                                                          common.
 104                                                                          node)));
 105                         if (ACPI_FAILURE(status)) {
 106                                 /* Check if we are resolving a named reference within a package */
 107
 108                                 if ((status == AE_NOT_FOUND)
 109                                     && (acpi_gbl_enable_interpreter_slack)
 110                                     &&
 111                                     ((op->common.parent->common.aml_opcode ==
 112                                       AML_PACKAGE_OP)
 113                                      || (op->common.parent->common.aml_opcode ==
 114                                          AML_VAR_PACKAGE_OP))) {
 115                                         /*
 116                                          * We didn't find the target and we are populating elements
 117                                          * of a package - ignore if slack enabled. Some ASL code
 118                                          * contains dangling invalid references in packages and
 119                                          * expects that no exception will be issued. Leave the
 120                                          * element as a null element. It cannot be used, but it
 121                                          * can be overwritten by subsequent ASL code - this is
 122                                          * typically the case.
 123                                          */
 124                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 125                                                           "Ignoring unresolved reference in package [%4.4s]\n",
 126                                                           walk_state->
 127                                                           scope_info->scope.
 128                                                           node->name.ascii));
 129
 130                                         return_ACPI_STATUS(AE_OK);
 131                                 } else {
 132                                         ACPI_ERROR_NAMESPACE(op->common.value.
 133                                                              string, status);
 134                                 }
 135
 136                                 return_ACPI_STATUS(status);
 137                         }
 138                 }
 139         }
 140
 141         /* Create and init a new internal ACPI object */
 142
 143         obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info
 144                                                    (op->common.aml_opcode))->
 145                                                   object_type);
 146         if (!obj_desc) {
 147                 return_ACPI_STATUS(AE_NO_MEMORY);
 148         }
 149
 150         status =
 151             acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode,
 152                                         &obj_desc);
 153         if (ACPI_FAILURE(status)) {
 154                 acpi_ut_remove_reference(obj_desc);
 155                 return_ACPI_STATUS(status);
 156         }
 157
 158         *obj_desc_ptr = obj_desc;
 159         return_ACPI_STATUS(AE_OK);
 160 }
 161
 162 /*******************************************************************************
 163  *
 164  * FUNCTION:    acpi_ds_build_internal_buffer_obj
 165  *
 166  * PARAMETERS:  walk_state      - Current walk state
 167  *              Op              - Parser object to be translated
 168  *              buffer_length   - Length of the buffer
 169  *              obj_desc_ptr    - Where the ACPI internal object is returned
 170  *
 171  * RETURN:      Status
 172  *
 173  * DESCRIPTION: Translate a parser Op package object to the equivalent
 174  *              namespace object
 175  *
 176  ******************************************************************************/
 177
 178 acpi_status
 179 acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
 180                                   union acpi_parse_object *op,
 181                                   u32 buffer_length,
 182                                   union acpi_operand_object **obj_desc_ptr)
 183 {
 184         union acpi_parse_object *arg;
 185         union acpi_operand_object *obj_desc;
 186         union acpi_parse_object *byte_list;
 187         u32 byte_list_length = 0;
 188
 189         ACPI_FUNCTION_TRACE("ds_build_internal_buffer_obj");
 190
 191         /*
 192          * If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
 193          * The buffer object already exists (from the NS node), otherwise it must
 194          * be created.
 195          */
 196         obj_desc = *obj_desc_ptr;
 197         if (!obj_desc) {
 198                 /* Create a new buffer object */
 199
 200                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
 201                 *obj_desc_ptr = obj_desc;
 202                 if (!obj_desc) {
 203                         return_ACPI_STATUS(AE_NO_MEMORY);
 204                 }
 205         }
 206
 207         /*
 208          * Second arg is the buffer data (optional) byte_list can be either
 209          * individual bytes or a string initializer.  In either case, a
 210          * byte_list appears in the AML.
 211          */
 212         arg = op->common.value.arg;     /* skip first arg */
 213
 214         byte_list = arg->named.next;
 215         if (byte_list) {
 216                 if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) {
 217                         ACPI_ERROR((AE_INFO,
 218                                     "Expecting bytelist, got AML opcode %X in op %p",
 219                                     byte_list->common.aml_opcode, byte_list));
 220
 221                         acpi_ut_remove_reference(obj_desc);
 222                         return (AE_TYPE);
 223                 }
 224
 225                 byte_list_length = (u32) byte_list->common.value.integer;
 226         }
 227
 228         /*
 229          * The buffer length (number of bytes) will be the larger of:
 230          * 1) The specified buffer length and
 231          * 2) The length of the initializer byte list
 232          */
 233         obj_desc->buffer.length = buffer_length;
 234         if (byte_list_length > buffer_length) {
 235                 obj_desc->buffer.length = byte_list_length;
 236         }
 237
 238         /* Allocate the buffer */
 239
 240         if (obj_desc->buffer.length == 0) {
 241                 obj_desc->buffer.pointer = NULL;
 242                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 243                                   "Buffer defined with zero length in AML, creating\n"));
 244         } else {
 245                 obj_desc->buffer.pointer =
 246                     ACPI_MEM_CALLOCATE(obj_desc->buffer.length);
 247                 if (!obj_desc->buffer.pointer) {
 248                         acpi_ut_delete_object_desc(obj_desc);
 249                         return_ACPI_STATUS(AE_NO_MEMORY);
 250                 }
 251
 252                 /* Initialize buffer from the byte_list (if present) */
 253
 254                 if (byte_list) {
 255                         ACPI_MEMCPY(obj_desc->buffer.pointer,
 256                                     byte_list->named.data, byte_list_length);
 257                 }
 258         }
 259
 260         obj_desc->buffer.flags |= AOPOBJ_DATA_VALID;
 261         op->common.node = (struct acpi_namespace_node *)obj_desc;
 262         return_ACPI_STATUS(AE_OK);
 263 }
 264
 265 /*******************************************************************************
 266  *
 267  * FUNCTION:    acpi_ds_build_internal_package_obj
 268  *
 269  * PARAMETERS:  walk_state      - Current walk state
 270  *              Op              - Parser object to be translated
 271  *              package_length  - Number of elements in the package
 272  *              obj_desc_ptr    - Where the ACPI internal object is returned
 273  *
 274  * RETURN:      Status
 275  *
 276  * DESCRIPTION: Translate a parser Op package object to the equivalent
 277  *              namespace object
 278  *
 279  ******************************************************************************/
 280
 281 acpi_status
 282 acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
 283                                    union acpi_parse_object *op,
 284                                    u32 package_length,
 285                                    union acpi_operand_object **obj_desc_ptr)
 286 {
 287         union acpi_parse_object *arg;
 288         union acpi_parse_object *parent;
 289         union acpi_operand_object *obj_desc = NULL;
 290         u32 package_list_length;
 291         acpi_status status = AE_OK;
 292         acpi_native_uint i;
 293
 294         ACPI_FUNCTION_TRACE("ds_build_internal_package_obj");
 295
 296         /* Find the parent of a possibly nested package */
 297
 298         parent = op->common.parent;
 299         while ((parent->common.aml_opcode == AML_PACKAGE_OP) ||
 300                (parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) {
 301                 parent = parent->common.parent;
 302         }
 303
 304         /*
 305          * If we are evaluating a Named package object "Name (xxxx, Package)",
 306          * the package object already exists, otherwise it must be created.
 307          */
 308         obj_desc = *obj_desc_ptr;
 309         if (!obj_desc) {
 310                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
 311                 *obj_desc_ptr = obj_desc;
 312                 if (!obj_desc) {
 313                         return_ACPI_STATUS(AE_NO_MEMORY);
 314                 }
 315
 316                 obj_desc->package.node = parent->common.node;
 317         }
 318
 319         obj_desc->package.count = package_length;
 320
 321         /* Count the number of items in the package list */
 322
 323         arg = op->common.value.arg;
 324         arg = arg->common.next;
 325         for (package_list_length = 0; arg; package_list_length++) {
 326                 arg = arg->common.next;
 327         }
 328
 329         /*
 330          * The package length (number of elements) will be the greater
 331          * of the specified length and the length of the initializer list
 332          */
 333         if (package_list_length > package_length) {
 334                 obj_desc->package.count = package_list_length;
 335         }
 336
 337         /*
 338          * Allocate the pointer array (array of pointers to the
 339          * individual objects). Add an extra pointer slot so
 340          * that the list is always null terminated.
 341          */
 342         obj_desc->package.elements = ACPI_MEM_CALLOCATE(((acpi_size) obj_desc->
 343                                                          package.count +
 344                                                          1) * sizeof(void *));
 345
 346         if (!obj_desc->package.elements) {
 347                 acpi_ut_delete_object_desc(obj_desc);
 348                 return_ACPI_STATUS(AE_NO_MEMORY);
 349         }
 350
 351         /*
 352          * Initialize all elements of the package
 353          */
 354         arg = op->common.value.arg;
 355         arg = arg->common.next;
 356         for (i = 0; arg; i++) {
 357                 if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
 358                         /* Object (package or buffer) is already built */
 359
 360                         obj_desc->package.elements[i] =
 361                             ACPI_CAST_PTR(union acpi_operand_object,
 362                                           arg->common.node);
 363                 } else {
 364                         status = acpi_ds_build_internal_object(walk_state, arg,
 365                                                                &obj_desc->
 366                                                                package.
 367                                                                elements[i]);
 368                 }
 369                 arg = arg->common.next;
 370         }
 371
 372         obj_desc->package.flags |= AOPOBJ_DATA_VALID;
 373         op->common.node = (struct acpi_namespace_node *)obj_desc;
 374         return_ACPI_STATUS(status);
 375 }
 376
 377 /*******************************************************************************
 378  *
 379  * FUNCTION:    acpi_ds_create_node
 380  *
 381  * PARAMETERS:  walk_state      - Current walk state
 382  *              Node            - NS Node to be initialized
 383  *              Op              - Parser object to be translated
 384  *
 385  * RETURN:      Status
 386  *
 387  * DESCRIPTION: Create the object to be associated with a namespace node
 388  *
 389  ******************************************************************************/
 390
 391 acpi_status
 392 acpi_ds_create_node(struct acpi_walk_state *walk_state,
 393                     struct acpi_namespace_node *node,
 394                     union acpi_parse_object *op)
 395 {
 396         acpi_status status;
 397         union acpi_operand_object *obj_desc;
 398
 399         ACPI_FUNCTION_TRACE_PTR("ds_create_node", op);
 400
 401         /*
 402          * Because of the execution pass through the non-control-method
 403          * parts of the table, we can arrive here twice.  Only init
 404          * the named object node the first time through
 405          */
 406         if (acpi_ns_get_attached_object(node)) {
 407                 return_ACPI_STATUS(AE_OK);
 408         }
 409
 410         if (!op->common.value.arg) {
 411                 /* No arguments, there is nothing to do */
 412
 413                 return_ACPI_STATUS(AE_OK);
 414         }
 415
 416         /* Build an internal object for the argument(s) */
 417
 418         status = acpi_ds_build_internal_object(walk_state, op->common.value.arg,
 419                                                &obj_desc);
 420         if (ACPI_FAILURE(status)) {
 421                 return_ACPI_STATUS(status);
 422         }
 423
 424         /* Re-type the object according to its argument */
 425
 426         node->type = ACPI_GET_OBJECT_TYPE(obj_desc);
 427
 428         /* Attach obj to node */
 429
 430         status = acpi_ns_attach_object(node, obj_desc, node->type);
 431
 432         /* Remove local reference to the object */
 433
 434         acpi_ut_remove_reference(obj_desc);
 435         return_ACPI_STATUS(status);
 436 }
 437
 438 #endif                          /* ACPI_NO_METHOD_EXECUTION */
 439
 440 /*******************************************************************************
 441  *
 442  * FUNCTION:    acpi_ds_init_object_from_op
 443  *
 444  * PARAMETERS:  walk_state      - Current walk state
 445  *              Op              - Parser op used to init the internal object
 446  *              Opcode          - AML opcode associated with the object
 447  *              ret_obj_desc    - Namespace object to be initialized
 448  *
 449  * RETURN:      Status
 450  *
 451  * DESCRIPTION: Initialize a namespace object from a parser Op and its
 452  *              associated arguments.  The namespace object is a more compact
 453  *              representation of the Op and its arguments.
 454  *
 455  ******************************************************************************/
 456
 457 acpi_status
 458 acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
 459                             union acpi_parse_object *op,
 460                             u16 opcode,
 461                             union acpi_operand_object **ret_obj_desc)
 462 {
 463         const struct acpi_opcode_info *op_info;
 464         union acpi_operand_object *obj_desc;
 465         acpi_status status = AE_OK;
 466
 467         ACPI_FUNCTION_TRACE("ds_init_object_from_op");
 468
 469         obj_desc = *ret_obj_desc;
 470         op_info = acpi_ps_get_opcode_info(opcode);
 471         if (op_info->class == AML_CLASS_UNKNOWN) {
 472                 /* Unknown opcode */
 473
 474                 return_ACPI_STATUS(AE_TYPE);
 475         }
 476
 477         /* Perform per-object initialization */
 478
 479         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 480         case ACPI_TYPE_BUFFER:
 481
 482                 /*
 483                  * Defer evaluation of Buffer term_arg operand
 484                  */
 485                 obj_desc->buffer.node = (struct acpi_namespace_node *)
 486                     walk_state->operands[0];
 487                 obj_desc->buffer.aml_start = op->named.data;
 488                 obj_desc->buffer.aml_length = op->named.length;
 489                 break;
 490
 491         case ACPI_TYPE_PACKAGE:
 492
 493                 /*
 494                  * Defer evaluation of Package term_arg operand
 495                  */
 496                 obj_desc->package.node = (struct acpi_namespace_node *)
 497                     walk_state->operands[0];
 498                 obj_desc->package.aml_start = op->named.data;
 499                 obj_desc->package.aml_length = op->named.length;
 500                 break;
 501
 502         case ACPI_TYPE_INTEGER:
 503
 504                 switch (op_info->type) {
 505                 case AML_TYPE_CONSTANT:
 506                         /*
 507                          * Resolve AML Constants here - AND ONLY HERE!
 508                          * All constants are integers.
 509                          * We mark the integer with a flag that indicates that it started
 510                          * life as a constant -- so that stores to constants will perform
 511                          * as expected (noop). zero_op is used as a placeholder for optional
 512                          * target operands.
 513                          */
 514                         obj_desc->common.flags = AOPOBJ_AML_CONSTANT;
 515
 516                         switch (opcode) {
 517                         case AML_ZERO_OP:
 518
 519                                 obj_desc->integer.value = 0;
 520                                 break;
 521
 522                         case AML_ONE_OP:
 523
 524                                 obj_desc->integer.value = 1;
 525                                 break;
 526
 527                         case AML_ONES_OP:
 528
 529                                 obj_desc->integer.value = ACPI_INTEGER_MAX;
 530
 531                                 /* Truncate value if we are executing from a 32-bit ACPI table */
 532
 533 #ifndef ACPI_NO_METHOD_EXECUTION
 534                                 acpi_ex_truncate_for32bit_table(obj_desc);
 535 #endif
 536                                 break;
 537
 538                         case AML_REVISION_OP:
 539
 540                                 obj_desc->integer.value = ACPI_CA_VERSION;
 541                                 break;
 542
 543                         default:
 544
 545                                 ACPI_ERROR((AE_INFO,
 546                                             "Unknown constant opcode %X",
 547                                             opcode));
 548                                 status = AE_AML_OPERAND_TYPE;
 549                                 break;
 550                         }
 551                         break;
 552
 553                 case AML_TYPE_LITERAL:
 554
 555                         obj_desc->integer.value = op->common.value.integer;
 556 #ifndef ACPI_NO_METHOD_EXECUTION
 557                         acpi_ex_truncate_for32bit_table(obj_desc);
 558 #endif
 559                         break;
 560
 561                 default:
 562                         ACPI_ERROR((AE_INFO, "Unknown Integer type %X",
 563                                     op_info->type));
 564                         status = AE_AML_OPERAND_TYPE;
 565                         break;
 566                 }
 567                 break;
 568
 569         case ACPI_TYPE_STRING:
 570
 571                 obj_desc->string.pointer = op->common.value.string;
 572                 obj_desc->string.length =
 573                     (u32) ACPI_STRLEN(op->common.value.string);
 574
 575                 /*
 576                  * The string is contained in the ACPI table, don't ever try
 577                  * to delete it
 578                  */
 579                 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
 580                 break;
 581
 582         case ACPI_TYPE_METHOD:
 583                 break;
 584
 585         case ACPI_TYPE_LOCAL_REFERENCE:
 586
 587                 switch (op_info->type) {
 588                 case AML_TYPE_LOCAL_VARIABLE:
 589
 590                         /* Split the opcode into a base opcode + offset */
 591
 592                         obj_desc->reference.opcode = AML_LOCAL_OP;
 593                         obj_desc->reference.offset = opcode - AML_LOCAL_OP;
 594
 595 #ifndef ACPI_NO_METHOD_EXECUTION
 596                         status = acpi_ds_method_data_get_node(AML_LOCAL_OP,
 597                                                               obj_desc->
 598                                                               reference.offset,
 599                                                               walk_state,
 600                                                               (struct
 601                                                                acpi_namespace_node
 602                                                                **)&obj_desc->
 603                                                               reference.object);
 604 #endif
 605                         break;
 606
 607                 case AML_TYPE_METHOD_ARGUMENT:
 608
 609                         /* Split the opcode into a base opcode + offset */
 610
 611                         obj_desc->reference.opcode = AML_ARG_OP;
 612                         obj_desc->reference.offset = opcode - AML_ARG_OP;
 613
 614 #ifndef ACPI_NO_METHOD_EXECUTION
 615                         status = acpi_ds_method_data_get_node(AML_ARG_OP,
 616                                                               obj_desc->
 617                                                               reference.offset,
 618                                                               walk_state,
 619                                                               (struct
 620                                                                acpi_namespace_node
 621                                                                **)&obj_desc->
 622                                                               reference.object);
 623 #endif
 624                         break;
 625
 626                 default:        /* Other literals, etc.. */
 627
 628                         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 629                                 /* Node was saved in Op */
 630
 631                                 obj_desc->reference.node = op->common.node;
 632                         }
 633
 634                         obj_desc->reference.opcode = opcode;
 635                         break;
 636                 }
 637                 break;
 638
 639         default:
 640
 641                 ACPI_ERROR((AE_INFO, "Unimplemented data type: %X",
 642                             ACPI_GET_OBJECT_TYPE(obj_desc)));
 643
 644                 status = AE_AML_OPERAND_TYPE;
 645                 break;
 646         }
 647
 648         return_ACPI_STATUS(status);
 649 }