drivers/acpi/dispatcher/dsmthdat.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: dsmthdat - control method arguments and local variables
   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/acdispat.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/acinterp.h>
  49
  50 #define _COMPONENT          ACPI_DISPATCHER
  51 ACPI_MODULE_NAME("dsmthdat")
  52
  53 /* Local prototypes */
  54 static void
  55 acpi_ds_method_data_delete_value(u16 opcode,
  56                                  u32 index, struct acpi_walk_state *walk_state);
  57
  58 static acpi_status
  59 acpi_ds_method_data_set_value(u16 opcode,
  60                               u32 index,
  61                               union acpi_operand_object *object,
  62                               struct acpi_walk_state *walk_state);
  63
  64 #ifdef ACPI_OBSOLETE_FUNCTIONS
  65 acpi_object_type
  66 acpi_ds_method_data_get_type(u16 opcode,
  67                              u32 index, struct acpi_walk_state *walk_state);
  68 #endif
  69
  70 /*******************************************************************************
  71  *
  72  * FUNCTION:    acpi_ds_method_data_init
  73  *
  74  * PARAMETERS:  walk_state          - Current walk state object
  75  *
  76  * RETURN:      Status
  77  *
  78  * DESCRIPTION: Initialize the data structures that hold the method's arguments
  79  *              and locals.  The data struct is an array of namespace nodes for
  80  *              each - this allows ref_of and de_ref_of to work properly for these
  81  *              special data types.
  82  *
  83  * NOTES:       walk_state fields are initialized to zero by the
  84  *              ACPI_ALLOCATE_ZEROED().
  85  *
  86  *              A pseudo-Namespace Node is assigned to each argument and local
  87  *              so that ref_of() can return a pointer to the Node.
  88  *
  89  ******************************************************************************/
  90
  91 void acpi_ds_method_data_init(struct acpi_walk_state *walk_state)
  92 {
  93         u32 i;
  94
  95         ACPI_FUNCTION_TRACE(ds_method_data_init);
  96
  97         /* Init the method arguments */
  98
  99         for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) {
 100                 ACPI_MOVE_32_TO_32(&walk_state->arguments[i].name,
 101                                    NAMEOF_ARG_NTE);
 102                 walk_state->arguments[i].name.integer |= (i << 24);
 103                 walk_state->arguments[i].descriptor_type = ACPI_DESC_TYPE_NAMED;
 104                 walk_state->arguments[i].type = ACPI_TYPE_ANY;
 105                 walk_state->arguments[i].flags =
 106                     ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG;
 107         }
 108
 109         /* Init the method locals */
 110
 111         for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) {
 112                 ACPI_MOVE_32_TO_32(&walk_state->local_variables[i].name,
 113                                    NAMEOF_LOCAL_NTE);
 114
 115                 walk_state->local_variables[i].name.integer |= (i << 24);
 116                 walk_state->local_variables[i].descriptor_type =
 117                     ACPI_DESC_TYPE_NAMED;
 118                 walk_state->local_variables[i].type = ACPI_TYPE_ANY;
 119                 walk_state->local_variables[i].flags =
 120                     ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL;
 121         }
 122
 123         return_VOID;
 124 }
 125
 126 /*******************************************************************************
 127  *
 128  * FUNCTION:    acpi_ds_method_data_delete_all
 129  *
 130  * PARAMETERS:  walk_state          - Current walk state object
 131  *
 132  * RETURN:      None
 133  *
 134  * DESCRIPTION: Delete method locals and arguments.  Arguments are only
 135  *              deleted if this method was called from another method.
 136  *
 137  ******************************************************************************/
 138
 139 void acpi_ds_method_data_delete_all(struct acpi_walk_state *walk_state)
 140 {
 141         u32 index;
 142
 143         ACPI_FUNCTION_TRACE(ds_method_data_delete_all);
 144
 145         /* Detach the locals */
 146
 147         for (index = 0; index < ACPI_METHOD_NUM_LOCALS; index++) {
 148                 if (walk_state->local_variables[index].object) {
 149                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Local%d=%p\n",
 150                                           index,
 151                                           walk_state->local_variables[index].
 152                                           object));
 153
 154                         /* Detach object (if present) and remove a reference */
 155
 156                         acpi_ns_detach_object(&walk_state->
 157                                               local_variables[index]);
 158                 }
 159         }
 160
 161         /* Detach the arguments */
 162
 163         for (index = 0; index < ACPI_METHOD_NUM_ARGS; index++) {
 164                 if (walk_state->arguments[index].object) {
 165                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Arg%d=%p\n",
 166                                           index,
 167                                           walk_state->arguments[index].object));
 168
 169                         /* Detach object (if present) and remove a reference */
 170
 171                         acpi_ns_detach_object(&walk_state->arguments[index]);
 172                 }
 173         }
 174
 175         return_VOID;
 176 }
 177
 178 /*******************************************************************************
 179  *
 180  * FUNCTION:    acpi_ds_method_data_init_args
 181  *
 182  * PARAMETERS:  *Params         - Pointer to a parameter list for the method
 183  *              max_param_count - The arg count for this method
 184  *              walk_state      - Current walk state object
 185  *
 186  * RETURN:      Status
 187  *
 188  * DESCRIPTION: Initialize arguments for a method.  The parameter list is a list
 189  *              of ACPI operand objects, either null terminated or whose length
 190  *              is defined by max_param_count.
 191  *
 192  ******************************************************************************/
 193
 194 acpi_status
 195 acpi_ds_method_data_init_args(union acpi_operand_object **params,
 196                               u32 max_param_count,
 197                               struct acpi_walk_state *walk_state)
 198 {
 199         acpi_status status;
 200         u32 index = 0;
 201
 202         ACPI_FUNCTION_TRACE_PTR(ds_method_data_init_args, params);
 203
 204         if (!params) {
 205                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 206                                   "No param list passed to method\n"));
 207                 return_ACPI_STATUS(AE_OK);
 208         }
 209
 210         /* Copy passed parameters into the new method stack frame */
 211
 212         while ((index < ACPI_METHOD_NUM_ARGS) &&
 213                (index < max_param_count) && params[index]) {
 214                 /*
 215                  * A valid parameter.
 216                  * Store the argument in the method/walk descriptor.
 217                  * Do not copy the arg in order to implement call by reference
 218                  */
 219                 status = acpi_ds_method_data_set_value(AML_ARG_OP, index,
 220                                                        params[index],
 221                                                        walk_state);
 222                 if (ACPI_FAILURE(status)) {
 223                         return_ACPI_STATUS(status);
 224                 }
 225
 226                 index++;
 227         }
 228
 229         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%d args passed to method\n", index));
 230         return_ACPI_STATUS(AE_OK);
 231 }
 232
 233 /*******************************************************************************
 234  *
 235  * FUNCTION:    acpi_ds_method_data_get_node
 236  *
 237  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 238  *              Index               - Which Local or Arg whose type to get
 239  *              walk_state          - Current walk state object
 240  *              Node                - Where the node is returned.
 241  *
 242  * RETURN:      Status and node
 243  *
 244  * DESCRIPTION: Get the Node associated with a local or arg.
 245  *
 246  ******************************************************************************/
 247
 248 acpi_status
 249 acpi_ds_method_data_get_node(u16 opcode,
 250                              u32 index,
 251                              struct acpi_walk_state *walk_state,
 252                              struct acpi_namespace_node **node)
 253 {
 254         ACPI_FUNCTION_TRACE(ds_method_data_get_node);
 255
 256         /*
 257          * Method Locals and Arguments are supported
 258          */
 259         switch (opcode) {
 260         case AML_LOCAL_OP:
 261
 262                 if (index > ACPI_METHOD_MAX_LOCAL) {
 263                         ACPI_ERROR((AE_INFO,
 264                                     "Local index %d is invalid (max %d)",
 265                                     index, ACPI_METHOD_MAX_LOCAL));
 266                         return_ACPI_STATUS(AE_AML_INVALID_INDEX);
 267                 }
 268
 269                 /* Return a pointer to the pseudo-node */
 270
 271                 *node = &walk_state->local_variables[index];
 272                 break;
 273
 274         case AML_ARG_OP:
 275
 276                 if (index > ACPI_METHOD_MAX_ARG) {
 277                         ACPI_ERROR((AE_INFO,
 278                                     "Arg index %d is invalid (max %d)",
 279                                     index, ACPI_METHOD_MAX_ARG));
 280                         return_ACPI_STATUS(AE_AML_INVALID_INDEX);
 281                 }
 282
 283                 /* Return a pointer to the pseudo-node */
 284
 285                 *node = &walk_state->arguments[index];
 286                 break;
 287
 288         default:
 289                 ACPI_ERROR((AE_INFO, "Opcode %d is invalid", opcode));
 290                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 291         }
 292
 293         return_ACPI_STATUS(AE_OK);
 294 }
 295
 296 /*******************************************************************************
 297  *
 298  * FUNCTION:    acpi_ds_method_data_set_value
 299  *
 300  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 301  *              Index               - Which Local or Arg to get
 302  *              Object              - Object to be inserted into the stack entry
 303  *              walk_state          - Current walk state object
 304  *
 305  * RETURN:      Status
 306  *
 307  * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
 308  *              Note: There is no "implicit conversion" for locals.
 309  *
 310  ******************************************************************************/
 311
 312 static acpi_status
 313 acpi_ds_method_data_set_value(u16 opcode,
 314                               u32 index,
 315                               union acpi_operand_object *object,
 316                               struct acpi_walk_state *walk_state)
 317 {
 318         acpi_status status;
 319         struct acpi_namespace_node *node;
 320
 321         ACPI_FUNCTION_TRACE(ds_method_data_set_value);
 322
 323         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 324                           "NewObj %p Opcode %X, Refs=%d [%s]\n", object,
 325                           opcode, object->common.reference_count,
 326                           acpi_ut_get_type_name(object->common.type)));
 327
 328         /* Get the namespace node for the arg/local */
 329
 330         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 331         if (ACPI_FAILURE(status)) {
 332                 return_ACPI_STATUS(status);
 333         }
 334
 335         /*
 336          * Increment ref count so object can't be deleted while installed.
 337          * NOTE: We do not copy the object in order to preserve the call by
 338          * reference semantics of ACPI Control Method invocation.
 339          * (See ACPI Specification 2.0_c)
 340          */
 341         acpi_ut_add_reference(object);
 342
 343         /* Install the object */
 344
 345         node->object = object;
 346         return_ACPI_STATUS(status);
 347 }
 348
 349 /*******************************************************************************
 350  *
 351  * FUNCTION:    acpi_ds_method_data_get_value
 352  *
 353  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 354  *              Index               - Which local_var or argument to get
 355  *              walk_state          - Current walk state object
 356  *              dest_desc           - Where Arg or Local value is returned
 357  *
 358  * RETURN:      Status
 359  *
 360  * DESCRIPTION: Retrieve value of selected Arg or Local for this method
 361  *              Used only in acpi_ex_resolve_to_value().
 362  *
 363  ******************************************************************************/
 364
 365 acpi_status
 366 acpi_ds_method_data_get_value(u16 opcode,
 367                               u32 index,
 368                               struct acpi_walk_state *walk_state,
 369                               union acpi_operand_object **dest_desc)
 370 {
 371         acpi_status status;
 372         struct acpi_namespace_node *node;
 373         union acpi_operand_object *object;
 374
 375         ACPI_FUNCTION_TRACE(ds_method_data_get_value);
 376
 377         /* Validate the object descriptor */
 378
 379         if (!dest_desc) {
 380                 ACPI_ERROR((AE_INFO, "Null object descriptor pointer"));
 381                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 382         }
 383
 384         /* Get the namespace node for the arg/local */
 385
 386         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 387         if (ACPI_FAILURE(status)) {
 388                 return_ACPI_STATUS(status);
 389         }
 390
 391         /* Get the object from the node */
 392
 393         object = node->object;
 394
 395         /* Examine the returned object, it must be valid. */
 396
 397         if (!object) {
 398                 /*
 399                  * Index points to uninitialized object.
 400                  * This means that either 1) The expected argument was
 401                  * not passed to the method, or 2) A local variable
 402                  * was referenced by the method (via the ASL)
 403                  * before it was initialized.  Either case is an error.
 404                  */
 405
 406                 /* If slack enabled, init the local_x/arg_x to an Integer of value zero */
 407
 408                 if (acpi_gbl_enable_interpreter_slack) {
 409                         object =
 410                             acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 411                         if (!object) {
 412                                 return_ACPI_STATUS(AE_NO_MEMORY);
 413                         }
 414
 415                         object->integer.value = 0;
 416                         node->object = object;
 417                 }
 418
 419                 /* Otherwise, return the error */
 420
 421                 else
 422                         switch (opcode) {
 423                         case AML_ARG_OP:
 424
 425                                 ACPI_ERROR((AE_INFO,
 426                                             "Uninitialized Arg[%d] at node %p",
 427                                             index, node));
 428
 429                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG);
 430
 431                         case AML_LOCAL_OP:
 432
 433                                 ACPI_ERROR((AE_INFO,
 434                                             "Uninitialized Local[%d] at node %p",
 435                                             index, node));
 436
 437                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL);
 438
 439                         default:
 440                                 ACPI_ERROR((AE_INFO,
 441                                             "Not a Arg/Local opcode: %X",
 442                                             opcode));
 443                                 return_ACPI_STATUS(AE_AML_INTERNAL);
 444                         }
 445         }
 446
 447         /*
 448          * The Index points to an initialized and valid object.
 449          * Return an additional reference to the object
 450          */
 451         *dest_desc = object;
 452         acpi_ut_add_reference(object);
 453
 454         return_ACPI_STATUS(AE_OK);
 455 }
 456
 457 /*******************************************************************************
 458  *
 459  * FUNCTION:    acpi_ds_method_data_delete_value
 460  *
 461  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 462  *              Index               - Which local_var or argument to delete
 463  *              walk_state          - Current walk state object
 464  *
 465  * RETURN:      None
 466  *
 467  * DESCRIPTION: Delete the entry at Opcode:Index.  Inserts
 468  *              a null into the stack slot after the object is deleted.
 469  *
 470  ******************************************************************************/
 471
 472 static void
 473 acpi_ds_method_data_delete_value(u16 opcode,
 474                                  u32 index, struct acpi_walk_state *walk_state)
 475 {
 476         acpi_status status;
 477         struct acpi_namespace_node *node;
 478         union acpi_operand_object *object;
 479
 480         ACPI_FUNCTION_TRACE(ds_method_data_delete_value);
 481
 482         /* Get the namespace node for the arg/local */
 483
 484         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 485         if (ACPI_FAILURE(status)) {
 486                 return_VOID;
 487         }
 488
 489         /* Get the associated object */
 490
 491         object = acpi_ns_get_attached_object(node);
 492
 493         /*
 494          * Undefine the Arg or Local by setting its descriptor
 495          * pointer to NULL. Locals/Args can contain both
 496          * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
 497          */
 498         node->object = NULL;
 499
 500         if ((object) &&
 501             (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_OPERAND)) {
 502                 /*
 503                  * There is a valid object.
 504                  * Decrement the reference count by one to balance the
 505                  * increment when the object was stored.
 506                  */
 507                 acpi_ut_remove_reference(object);
 508         }
 509
 510         return_VOID;
 511 }
 512
 513 /*******************************************************************************
 514  *
 515  * FUNCTION:    acpi_ds_store_object_to_local
 516  *
 517  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 518  *              Index               - Which Local or Arg to set
 519  *              obj_desc            - Value to be stored
 520  *              walk_state          - Current walk state
 521  *
 522  * RETURN:      Status
 523  *
 524  * DESCRIPTION: Store a value in an Arg or Local.  The obj_desc is installed
 525  *              as the new value for the Arg or Local and the reference count
 526  *              for obj_desc is incremented.
 527  *
 528  ******************************************************************************/
 529
 530 acpi_status
 531 acpi_ds_store_object_to_local(u16 opcode,
 532                               u32 index,
 533                               union acpi_operand_object *obj_desc,
 534                               struct acpi_walk_state *walk_state)
 535 {
 536         acpi_status status;
 537         struct acpi_namespace_node *node;
 538         union acpi_operand_object *current_obj_desc;
 539         union acpi_operand_object *new_obj_desc;
 540
 541         ACPI_FUNCTION_TRACE(ds_store_object_to_local);
 542         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Opcode=%X Index=%d Obj=%p\n",
 543                           opcode, index, obj_desc));
 544
 545         /* Parameter validation */
 546
 547         if (!obj_desc) {
 548                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 549         }
 550
 551         /* Get the namespace node for the arg/local */
 552
 553         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 554         if (ACPI_FAILURE(status)) {
 555                 return_ACPI_STATUS(status);
 556         }
 557
 558         current_obj_desc = acpi_ns_get_attached_object(node);
 559         if (current_obj_desc == obj_desc) {
 560                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n",
 561                                   obj_desc));
 562                 return_ACPI_STATUS(status);
 563         }
 564
 565         /*
 566          * If the reference count on the object is more than one, we must
 567          * take a copy of the object before we store.  A reference count
 568          * of exactly 1 means that the object was just created during the
 569          * evaluation of an expression, and we can safely use it since it
 570          * is not used anywhere else.
 571          */
 572         new_obj_desc = obj_desc;
 573         if (obj_desc->common.reference_count > 1) {
 574                 status =
 575                     acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc,
 576                                                     walk_state);
 577                 if (ACPI_FAILURE(status)) {
 578                         return_ACPI_STATUS(status);
 579                 }
 580         }
 581
 582         /*
 583          * If there is an object already in this slot, we either
 584          * have to delete it, or if this is an argument and there
 585          * is an object reference stored there, we have to do
 586          * an indirect store!
 587          */
 588         if (current_obj_desc) {
 589                 /*
 590                  * Check for an indirect store if an argument
 591                  * contains an object reference (stored as an Node).
 592                  * We don't allow this automatic dereferencing for
 593                  * locals, since a store to a local should overwrite
 594                  * anything there, including an object reference.
 595                  *
 596                  * If both Arg0 and Local0 contain ref_of (Local4):
 597                  *
 598                  * Store (1, Arg0)             - Causes indirect store to local4
 599                  * Store (1, Local0)           - Stores 1 in local0, overwriting
 600                  *                                  the reference to local4
 601                  * Store (1, de_refof (Local0)) - Causes indirect store to local4
 602                  *
 603                  * Weird, but true.
 604                  */
 605                 if (opcode == AML_ARG_OP) {
 606                         /*
 607                          * If we have a valid reference object that came from ref_of(),
 608                          * do the indirect store
 609                          */
 610                         if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) ==
 611                              ACPI_DESC_TYPE_OPERAND)
 612                             && (current_obj_desc->common.type ==
 613                                 ACPI_TYPE_LOCAL_REFERENCE)
 614                             && (current_obj_desc->reference.opcode ==
 615                                 AML_REF_OF_OP)) {
 616                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 617                                                   "Arg (%p) is an ObjRef(Node), storing in node %p\n",
 618                                                   new_obj_desc,
 619                                                   current_obj_desc));
 620
 621                                 /*
 622                                  * Store this object to the Node (perform the indirect store)
 623                                  * NOTE: No implicit conversion is performed, as per the ACPI
 624                                  * specification rules on storing to Locals/Args.
 625                                  */
 626                                 status =
 627                                     acpi_ex_store_object_to_node(new_obj_desc,
 628                                                                  current_obj_desc->
 629                                                                  reference.
 630                                                                  object,
 631                                                                  walk_state,
 632                                                                  ACPI_NO_IMPLICIT_CONVERSION);
 633
 634                                 /* Remove local reference if we copied the object above */
 635
 636                                 if (new_obj_desc != obj_desc) {
 637                                         acpi_ut_remove_reference(new_obj_desc);
 638                                 }
 639                                 return_ACPI_STATUS(status);
 640                         }
 641                 }
 642
 643                 /*
 644                  * Delete the existing object
 645                  * before storing the new one
 646                  */
 647                 acpi_ds_method_data_delete_value(opcode, index, walk_state);
 648         }
 649
 650         /*
 651          * Install the Obj descriptor (*new_obj_desc) into
 652          * the descriptor for the Arg or Local.
 653          * (increments the object reference count by one)
 654          */
 655         status =
 656             acpi_ds_method_data_set_value(opcode, index, new_obj_desc,
 657                                           walk_state);
 658
 659         /* Remove local reference if we copied the object above */
 660
 661         if (new_obj_desc != obj_desc) {
 662                 acpi_ut_remove_reference(new_obj_desc);
 663         }
 664
 665         return_ACPI_STATUS(status);
 666 }
 667
 668 #ifdef ACPI_OBSOLETE_FUNCTIONS
 669 /*******************************************************************************
 670  *
 671  * FUNCTION:    acpi_ds_method_data_get_type
 672  *
 673  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 674  *              Index               - Which Local or Arg whose type to get
 675  *              walk_state          - Current walk state object
 676  *
 677  * RETURN:      Data type of current value of the selected Arg or Local
 678  *
 679  * DESCRIPTION: Get the type of the object stored in the Local or Arg
 680  *
 681  ******************************************************************************/
 682
 683 acpi_object_type
 684 acpi_ds_method_data_get_type(u16 opcode,
 685                              u32 index, struct acpi_walk_state *walk_state)
 686 {
 687         acpi_status status;
 688         struct acpi_namespace_node *node;
 689         union acpi_operand_object *object;
 690
 691         ACPI_FUNCTION_TRACE(ds_method_data_get_type);
 692
 693         /* Get the namespace node for the arg/local */
 694
 695         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 696         if (ACPI_FAILURE(status)) {
 697                 return_VALUE((ACPI_TYPE_NOT_FOUND));
 698         }
 699
 700         /* Get the object */
 701
 702         object = acpi_ns_get_attached_object(node);
 703         if (!object) {
 704
 705                 /* Uninitialized local/arg, return TYPE_ANY */
 706
 707                 return_VALUE(ACPI_TYPE_ANY);
 708         }
 709
 710         /* Get the object type */
 711
 712         return_VALUE(ACPI_GET_OBJECT_TYPE(object));
 713 }
 714 #endif