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_MEM_CALLOCATE().
  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 = ACPI_DESC_TYPE_NAMED;
 104                 walk_state->arguments[i].type = ACPI_TYPE_ANY;
 105                 walk_state->arguments[i].flags = ANOBJ_END_OF_PEER_LIST |
 106                     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 =
 117                     ACPI_DESC_TYPE_NAMED;
 118                 walk_state->local_variables[i].type = ACPI_TYPE_ANY;
 119                 walk_state->local_variables[i].flags = ANOBJ_END_OF_PEER_LIST |
 120                     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_REPORT_ERROR(("Local index %d is invalid (max %d)\n", index, ACPI_METHOD_MAX_LOCAL));
 264                         return_ACPI_STATUS(AE_AML_INVALID_INDEX);
 265                 }
 266
 267                 /* Return a pointer to the pseudo-node */
 268
 269                 *node = &walk_state->local_variables[index];
 270                 break;
 271
 272         case AML_ARG_OP:
 273
 274                 if (index > ACPI_METHOD_MAX_ARG) {
 275                         ACPI_REPORT_ERROR(("Arg index %d is invalid (max %d)\n",
 276                                            index, ACPI_METHOD_MAX_ARG));
 277                         return_ACPI_STATUS(AE_AML_INVALID_INDEX);
 278                 }
 279
 280                 /* Return a pointer to the pseudo-node */
 281
 282                 *node = &walk_state->arguments[index];
 283                 break;
 284
 285         default:
 286                 ACPI_REPORT_ERROR(("Opcode %d is invalid\n", opcode));
 287                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 288         }
 289
 290         return_ACPI_STATUS(AE_OK);
 291 }
 292
 293 /*******************************************************************************
 294  *
 295  * FUNCTION:    acpi_ds_method_data_set_value
 296  *
 297  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 298  *              Index               - Which Local or Arg to get
 299  *              Object              - Object to be inserted into the stack entry
 300  *              walk_state          - Current walk state object
 301  *
 302  * RETURN:      Status
 303  *
 304  * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
 305  *              Note: There is no "implicit conversion" for locals.
 306  *
 307  ******************************************************************************/
 308
 309 static acpi_status
 310 acpi_ds_method_data_set_value(u16 opcode,
 311                               u32 index,
 312                               union acpi_operand_object *object,
 313                               struct acpi_walk_state *walk_state)
 314 {
 315         acpi_status status;
 316         struct acpi_namespace_node *node;
 317
 318         ACPI_FUNCTION_TRACE("ds_method_data_set_value");
 319
 320         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 321                           "new_obj %p Opcode %X, Refs=%d [%s]\n", object,
 322                           opcode, object->common.reference_count,
 323                           acpi_ut_get_type_name(object->common.type)));
 324
 325         /* Get the namespace node for the arg/local */
 326
 327         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 328         if (ACPI_FAILURE(status)) {
 329                 return_ACPI_STATUS(status);
 330         }
 331
 332         /*
 333          * Increment ref count so object can't be deleted while installed.
 334          * NOTE: We do not copy the object in order to preserve the call by
 335          * reference semantics of ACPI Control Method invocation.
 336          * (See ACPI specification 2.0_c)
 337          */
 338         acpi_ut_add_reference(object);
 339
 340         /* Install the object */
 341
 342         node->object = object;
 343         return_ACPI_STATUS(status);
 344 }
 345
 346 /*******************************************************************************
 347  *
 348  * FUNCTION:    acpi_ds_method_data_get_value
 349  *
 350  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 351  *              Index               - which local_var or argument to get
 352  *              walk_state          - Current walk state object
 353  *              dest_desc           - Where Arg or Local value is returned
 354  *
 355  * RETURN:      Status
 356  *
 357  * DESCRIPTION: Retrieve value of selected Arg or Local for this method
 358  *              Used only in acpi_ex_resolve_to_value().
 359  *
 360  ******************************************************************************/
 361
 362 acpi_status
 363 acpi_ds_method_data_get_value(u16 opcode,
 364                               u32 index,
 365                               struct acpi_walk_state *walk_state,
 366                               union acpi_operand_object **dest_desc)
 367 {
 368         acpi_status status;
 369         struct acpi_namespace_node *node;
 370         union acpi_operand_object *object;
 371
 372         ACPI_FUNCTION_TRACE("ds_method_data_get_value");
 373
 374         /* Validate the object descriptor */
 375
 376         if (!dest_desc) {
 377                 ACPI_REPORT_ERROR(("Null object descriptor pointer\n"));
 378                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 379         }
 380
 381         /* Get the namespace node for the arg/local */
 382
 383         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 384         if (ACPI_FAILURE(status)) {
 385                 return_ACPI_STATUS(status);
 386         }
 387
 388         /* Get the object from the node */
 389
 390         object = node->object;
 391
 392         /* Examine the returned object, it must be valid. */
 393
 394         if (!object) {
 395                 /*
 396                  * Index points to uninitialized object.
 397                  * This means that either 1) The expected argument was
 398                  * not passed to the method, or 2) A local variable
 399                  * was referenced by the method (via the ASL)
 400                  * before it was initialized.  Either case is an error.
 401                  */
 402
 403                 /* If slack enabled, init the local_x/arg_x to an Integer of value zero */
 404
 405                 if (acpi_gbl_enable_interpreter_slack) {
 406                         object =
 407                             acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 408                         if (!object) {
 409                                 return_ACPI_STATUS(AE_NO_MEMORY);
 410                         }
 411
 412                         object->integer.value = 0;
 413                         node->object = object;
 414                 }
 415
 416                 /* Otherwise, return the error */
 417
 418                 else
 419                         switch (opcode) {
 420                         case AML_ARG_OP:
 421
 422                                 ACPI_REPORT_ERROR(("Uninitialized Arg[%d] at node %p\n", index, node));
 423
 424                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG);
 425
 426                         case AML_LOCAL_OP:
 427
 428                                 ACPI_REPORT_ERROR(("Uninitialized Local[%d] at node %p\n", index, node));
 429
 430                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL);
 431
 432                         default:
 433                                 ACPI_REPORT_ERROR(("Not a Arg/Local opcode: %X\n", opcode));
 434                                 return_ACPI_STATUS(AE_AML_INTERNAL);
 435                         }
 436         }
 437
 438         /*
 439          * The Index points to an initialized and valid object.
 440          * Return an additional reference to the object
 441          */
 442         *dest_desc = object;
 443         acpi_ut_add_reference(object);
 444
 445         return_ACPI_STATUS(AE_OK);
 446 }
 447
 448 /*******************************************************************************
 449  *
 450  * FUNCTION:    acpi_ds_method_data_delete_value
 451  *
 452  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 453  *              Index               - which local_var or argument to delete
 454  *              walk_state          - Current walk state object
 455  *
 456  * RETURN:      None
 457  *
 458  * DESCRIPTION: Delete the entry at Opcode:Index.  Inserts
 459  *              a null into the stack slot after the object is deleted.
 460  *
 461  ******************************************************************************/
 462
 463 static void
 464 acpi_ds_method_data_delete_value(u16 opcode,
 465                                  u32 index, struct acpi_walk_state *walk_state)
 466 {
 467         acpi_status status;
 468         struct acpi_namespace_node *node;
 469         union acpi_operand_object *object;
 470
 471         ACPI_FUNCTION_TRACE("ds_method_data_delete_value");
 472
 473         /* Get the namespace node for the arg/local */
 474
 475         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 476         if (ACPI_FAILURE(status)) {
 477                 return_VOID;
 478         }
 479
 480         /* Get the associated object */
 481
 482         object = acpi_ns_get_attached_object(node);
 483
 484         /*
 485          * Undefine the Arg or Local by setting its descriptor
 486          * pointer to NULL. Locals/Args can contain both
 487          * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
 488          */
 489         node->object = NULL;
 490
 491         if ((object) &&
 492             (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_OPERAND)) {
 493                 /*
 494                  * There is a valid object.
 495                  * Decrement the reference count by one to balance the
 496                  * increment when the object was stored.
 497                  */
 498                 acpi_ut_remove_reference(object);
 499         }
 500
 501         return_VOID;
 502 }
 503
 504 /*******************************************************************************
 505  *
 506  * FUNCTION:    acpi_ds_store_object_to_local
 507  *
 508  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 509  *              Index               - Which Local or Arg to set
 510  *              obj_desc            - Value to be stored
 511  *              walk_state          - Current walk state
 512  *
 513  * RETURN:      Status
 514  *
 515  * DESCRIPTION: Store a value in an Arg or Local.  The obj_desc is installed
 516  *              as the new value for the Arg or Local and the reference count
 517  *              for obj_desc is incremented.
 518  *
 519  ******************************************************************************/
 520
 521 acpi_status
 522 acpi_ds_store_object_to_local(u16 opcode,
 523                               u32 index,
 524                               union acpi_operand_object *obj_desc,
 525                               struct acpi_walk_state *walk_state)
 526 {
 527         acpi_status status;
 528         struct acpi_namespace_node *node;
 529         union acpi_operand_object *current_obj_desc;
 530         union acpi_operand_object *new_obj_desc;
 531
 532         ACPI_FUNCTION_TRACE("ds_store_object_to_local");
 533         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Opcode=%X Index=%d Obj=%p\n",
 534                           opcode, index, obj_desc));
 535
 536         /* Parameter validation */
 537
 538         if (!obj_desc) {
 539                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 540         }
 541
 542         /* Get the namespace node for the arg/local */
 543
 544         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 545         if (ACPI_FAILURE(status)) {
 546                 return_ACPI_STATUS(status);
 547         }
 548
 549         current_obj_desc = acpi_ns_get_attached_object(node);
 550         if (current_obj_desc == obj_desc) {
 551                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n",
 552                                   obj_desc));
 553                 return_ACPI_STATUS(status);
 554         }
 555
 556         /*
 557          * If the reference count on the object is more than one, we must
 558          * take a copy of the object before we store.  A reference count
 559          * of exactly 1 means that the object was just created during the
 560          * evaluation of an expression, and we can safely use it since it
 561          * is not used anywhere else.
 562          */
 563         new_obj_desc = obj_desc;
 564         if (obj_desc->common.reference_count > 1) {
 565                 status =
 566                     acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc,
 567                                                     walk_state);
 568                 if (ACPI_FAILURE(status)) {
 569                         return_ACPI_STATUS(status);
 570                 }
 571         }
 572
 573         /*
 574          * If there is an object already in this slot, we either
 575          * have to delete it, or if this is an argument and there
 576          * is an object reference stored there, we have to do
 577          * an indirect store!
 578          */
 579         if (current_obj_desc) {
 580                 /*
 581                  * Check for an indirect store if an argument
 582                  * contains an object reference (stored as an Node).
 583                  * We don't allow this automatic dereferencing for
 584                  * locals, since a store to a local should overwrite
 585                  * anything there, including an object reference.
 586                  *
 587                  * If both Arg0 and Local0 contain ref_of (Local4):
 588                  *
 589                  * Store (1, Arg0)             - Causes indirect store to local4
 590                  * Store (1, Local0)           - Stores 1 in local0, overwriting
 591                  *                                  the reference to local4
 592                  * Store (1, de_refof (Local0)) - Causes indirect store to local4
 593                  *
 594                  * Weird, but true.
 595                  */
 596                 if (opcode == AML_ARG_OP) {
 597                         /*
 598                          * If we have a valid reference object that came from ref_of(),
 599                          * do the indirect store
 600                          */
 601                         if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) ==
 602                              ACPI_DESC_TYPE_OPERAND)
 603                             && (current_obj_desc->common.type ==
 604                                 ACPI_TYPE_LOCAL_REFERENCE)
 605                             && (current_obj_desc->reference.opcode ==
 606                                 AML_REF_OF_OP)) {
 607                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 608                                                   "Arg (%p) is an obj_ref(Node), storing in node %p\n",
 609                                                   new_obj_desc,
 610                                                   current_obj_desc));
 611
 612                                 /*
 613                                  * Store this object to the Node (perform the indirect store)
 614                                  * NOTE: No implicit conversion is performed, as per the ACPI
 615                                  * specification rules on storing to Locals/Args.
 616                                  */
 617                                 status =
 618                                     acpi_ex_store_object_to_node(new_obj_desc,
 619                                                                  current_obj_desc->
 620                                                                  reference.
 621                                                                  object,
 622                                                                  walk_state,
 623                                                                  ACPI_NO_IMPLICIT_CONVERSION);
 624
 625                                 /* Remove local reference if we copied the object above */
 626
 627                                 if (new_obj_desc != obj_desc) {
 628                                         acpi_ut_remove_reference(new_obj_desc);
 629                                 }
 630                                 return_ACPI_STATUS(status);
 631                         }
 632                 }
 633
 634                 /*
 635                  * Delete the existing object
 636                  * before storing the new one
 637                  */
 638                 acpi_ds_method_data_delete_value(opcode, index, walk_state);
 639         }
 640
 641         /*
 642          * Install the Obj descriptor (*new_obj_desc) into
 643          * the descriptor for the Arg or Local.
 644          * (increments the object reference count by one)
 645          */
 646         status =
 647             acpi_ds_method_data_set_value(opcode, index, new_obj_desc,
 648                                           walk_state);
 649
 650         /* Remove local reference if we copied the object above */
 651
 652         if (new_obj_desc != obj_desc) {
 653                 acpi_ut_remove_reference(new_obj_desc);
 654         }
 655
 656         return_ACPI_STATUS(status);
 657 }
 658
 659 #ifdef ACPI_OBSOLETE_FUNCTIONS
 660 /*******************************************************************************
 661  *
 662  * FUNCTION:    acpi_ds_method_data_get_type
 663  *
 664  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 665  *              Index               - Which Local or Arg whose type to get
 666  *              walk_state          - Current walk state object
 667  *
 668  * RETURN:      Data type of current value of the selected Arg or Local
 669  *
 670  * DESCRIPTION: Get the type of the object stored in the Local or Arg
 671  *
 672  ******************************************************************************/
 673
 674 acpi_object_type
 675 acpi_ds_method_data_get_type(u16 opcode,
 676                              u32 index, struct acpi_walk_state *walk_state)
 677 {
 678         acpi_status status;
 679         struct acpi_namespace_node *node;
 680         union acpi_operand_object *object;
 681
 682         ACPI_FUNCTION_TRACE("ds_method_data_get_type");
 683
 684         /* Get the namespace node for the arg/local */
 685
 686         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 687         if (ACPI_FAILURE(status)) {
 688                 return_VALUE((ACPI_TYPE_NOT_FOUND));
 689         }
 690
 691         /* Get the object */
 692
 693         object = acpi_ns_get_attached_object(node);
 694         if (!object) {
 695                 /* Uninitialized local/arg, return TYPE_ANY */
 696
 697                 return_VALUE(ACPI_TYPE_ANY);
 698         }
 699
 700         /* Get the object type */
 701
 702         return_VALUE(ACPI_GET_OBJECT_TYPE(object));
 703 }
 704 #endif