drivers/acpi/acpica/dsmthdat.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: dsmthdat - control method arguments and local variables
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   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 "accommon.h"
  46 #include "acdispat.h"
  47 #include "acnamesp.h"
  48 #include "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(u8 type,
  56                                  u32 index, struct acpi_walk_state *walk_state);
  57
  58 static acpi_status
  59 acpi_ds_method_data_set_value(u8 type,
  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 = ANOBJ_METHOD_ARG;
 106         }
 107
 108         /* Init the method locals */
 109
 110         for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) {
 111                 ACPI_MOVE_32_TO_32(&walk_state->local_variables[i].name,
 112                                    NAMEOF_LOCAL_NTE);
 113
 114                 walk_state->local_variables[i].name.integer |= (i << 24);
 115                 walk_state->local_variables[i].descriptor_type =
 116                     ACPI_DESC_TYPE_NAMED;
 117                 walk_state->local_variables[i].type = ACPI_TYPE_ANY;
 118                 walk_state->local_variables[i].flags = ANOBJ_METHOD_LOCAL;
 119         }
 120
 121         return_VOID;
 122 }
 123
 124 /*******************************************************************************
 125  *
 126  * FUNCTION:    acpi_ds_method_data_delete_all
 127  *
 128  * PARAMETERS:  walk_state          - Current walk state object
 129  *
 130  * RETURN:      None
 131  *
 132  * DESCRIPTION: Delete method locals and arguments. Arguments are only
 133  *              deleted if this method was called from another method.
 134  *
 135  ******************************************************************************/
 136
 137 void acpi_ds_method_data_delete_all(struct acpi_walk_state *walk_state)
 138 {
 139         u32 index;
 140
 141         ACPI_FUNCTION_TRACE(ds_method_data_delete_all);
 142
 143         /* Detach the locals */
 144
 145         for (index = 0; index < ACPI_METHOD_NUM_LOCALS; index++) {
 146                 if (walk_state->local_variables[index].object) {
 147                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Local%u=%p\n",
 148                                           index,
 149                                           walk_state->local_variables[index].
 150                                           object));
 151
 152                         /* Detach object (if present) and remove a reference */
 153
 154                         acpi_ns_detach_object(&walk_state->
 155                                               local_variables[index]);
 156                 }
 157         }
 158
 159         /* Detach the arguments */
 160
 161         for (index = 0; index < ACPI_METHOD_NUM_ARGS; index++) {
 162                 if (walk_state->arguments[index].object) {
 163                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Arg%u=%p\n",
 164                                           index,
 165                                           walk_state->arguments[index].object));
 166
 167                         /* Detach object (if present) and remove a reference */
 168
 169                         acpi_ns_detach_object(&walk_state->arguments[index]);
 170                 }
 171         }
 172
 173         return_VOID;
 174 }
 175
 176 /*******************************************************************************
 177  *
 178  * FUNCTION:    acpi_ds_method_data_init_args
 179  *
 180  * PARAMETERS:  *params         - Pointer to a parameter list for the method
 181  *              max_param_count - The arg count for this method
 182  *              walk_state      - Current walk state object
 183  *
 184  * RETURN:      Status
 185  *
 186  * DESCRIPTION: Initialize arguments for a method. The parameter list is a list
 187  *              of ACPI operand objects, either null terminated or whose length
 188  *              is defined by max_param_count.
 189  *
 190  ******************************************************************************/
 191
 192 acpi_status
 193 acpi_ds_method_data_init_args(union acpi_operand_object **params,
 194                               u32 max_param_count,
 195                               struct acpi_walk_state *walk_state)
 196 {
 197         acpi_status status;
 198         u32 index = 0;
 199
 200         ACPI_FUNCTION_TRACE_PTR(ds_method_data_init_args, params);
 201
 202         if (!params) {
 203                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 204                                   "No param list passed to method\n"));
 205                 return_ACPI_STATUS(AE_OK);
 206         }
 207
 208         /* Copy passed parameters into the new method stack frame */
 209
 210         while ((index < ACPI_METHOD_NUM_ARGS) &&
 211                (index < max_param_count) && params[index]) {
 212                 /*
 213                  * A valid parameter.
 214                  * Store the argument in the method/walk descriptor.
 215                  * Do not copy the arg in order to implement call by reference
 216                  */
 217                 status = acpi_ds_method_data_set_value(ACPI_REFCLASS_ARG, index,
 218                                                        params[index],
 219                                                        walk_state);
 220                 if (ACPI_FAILURE(status)) {
 221                         return_ACPI_STATUS(status);
 222                 }
 223
 224                 index++;
 225         }
 226
 227         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%u args passed to method\n", index));
 228         return_ACPI_STATUS(AE_OK);
 229 }
 230
 231 /*******************************************************************************
 232  *
 233  * FUNCTION:    acpi_ds_method_data_get_node
 234  *
 235  * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
 236  *                                    ACPI_REFCLASS_ARG
 237  *              index               - Which Local or Arg whose type to get
 238  *              walk_state          - Current walk state object
 239  *              node                - Where the node is returned.
 240  *
 241  * RETURN:      Status and node
 242  *
 243  * DESCRIPTION: Get the Node associated with a local or arg.
 244  *
 245  ******************************************************************************/
 246
 247 acpi_status
 248 acpi_ds_method_data_get_node(u8 type,
 249                              u32 index,
 250                              struct acpi_walk_state *walk_state,
 251                              struct acpi_namespace_node **node)
 252 {
 253         ACPI_FUNCTION_TRACE(ds_method_data_get_node);
 254
 255         /*
 256          * Method Locals and Arguments are supported
 257          */
 258         switch (type) {
 259         case ACPI_REFCLASS_LOCAL:
 260
 261                 if (index > ACPI_METHOD_MAX_LOCAL) {
 262                         ACPI_ERROR((AE_INFO,
 263                                     "Local index %u is invalid (max %u)",
 264                                     index, ACPI_METHOD_MAX_LOCAL));
 265                         return_ACPI_STATUS(AE_AML_INVALID_INDEX);
 266                 }
 267
 268                 /* Return a pointer to the pseudo-node */
 269
 270                 *node = &walk_state->local_variables[index];
 271                 break;
 272
 273         case ACPI_REFCLASS_ARG:
 274
 275                 if (index > ACPI_METHOD_MAX_ARG) {
 276                         ACPI_ERROR((AE_INFO,
 277                                     "Arg index %u is invalid (max %u)",
 278                                     index, ACPI_METHOD_MAX_ARG));
 279                         return_ACPI_STATUS(AE_AML_INVALID_INDEX);
 280                 }
 281
 282                 /* Return a pointer to the pseudo-node */
 283
 284                 *node = &walk_state->arguments[index];
 285                 break;
 286
 287         default:
 288                 ACPI_ERROR((AE_INFO, "Type %u is invalid", type));
 289                 return_ACPI_STATUS(AE_TYPE);
 290         }
 291
 292         return_ACPI_STATUS(AE_OK);
 293 }
 294
 295 /*******************************************************************************
 296  *
 297  * FUNCTION:    acpi_ds_method_data_set_value
 298  *
 299  * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
 300  *                                    ACPI_REFCLASS_ARG
 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(u8 type,
 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 Type %2.2X, Refs=%u [%s]\n", object,
 325                           type, 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(type, 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 2.0C)
 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:  type                - Either ACPI_REFCLASS_LOCAL or
 354  *                                    ACPI_REFCLASS_ARG
 355  *              index               - Which localVar or argument to get
 356  *              walk_state          - Current walk state object
 357  *              dest_desc           - Where Arg or Local value is returned
 358  *
 359  * RETURN:      Status
 360  *
 361  * DESCRIPTION: Retrieve value of selected Arg or Local for this method
 362  *              Used only in acpi_ex_resolve_to_value().
 363  *
 364  ******************************************************************************/
 365
 366 acpi_status
 367 acpi_ds_method_data_get_value(u8 type,
 368                               u32 index,
 369                               struct acpi_walk_state *walk_state,
 370                               union acpi_operand_object **dest_desc)
 371 {
 372         acpi_status status;
 373         struct acpi_namespace_node *node;
 374         union acpi_operand_object *object;
 375
 376         ACPI_FUNCTION_TRACE(ds_method_data_get_value);
 377
 378         /* Validate the object descriptor */
 379
 380         if (!dest_desc) {
 381                 ACPI_ERROR((AE_INFO, "Null object descriptor pointer"));
 382                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 383         }
 384
 385         /* Get the namespace node for the arg/local */
 386
 387         status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
 388         if (ACPI_FAILURE(status)) {
 389                 return_ACPI_STATUS(status);
 390         }
 391
 392         /* Get the object from the node */
 393
 394         object = node->object;
 395
 396         /* Examine the returned object, it must be valid. */
 397
 398         if (!object) {
 399                 /*
 400                  * Index points to uninitialized object.
 401                  * This means that either 1) The expected argument was
 402                  * not passed to the method, or 2) A local variable
 403                  * was referenced by the method (via the ASL)
 404                  * before it was initialized. Either case is an error.
 405                  */
 406
 407                 /* If slack enabled, init the local_x/arg_x to an Integer of value zero */
 408
 409                 if (acpi_gbl_enable_interpreter_slack) {
 410                         object = acpi_ut_create_integer_object((u64) 0);
 411                         if (!object) {
 412                                 return_ACPI_STATUS(AE_NO_MEMORY);
 413                         }
 414
 415                         node->object = object;
 416                 }
 417
 418                 /* Otherwise, return the error */
 419
 420                 else
 421                         switch (type) {
 422                         case ACPI_REFCLASS_ARG:
 423
 424                                 ACPI_ERROR((AE_INFO,
 425                                             "Uninitialized Arg[%u] at node %p",
 426                                             index, node));
 427
 428                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG);
 429
 430                         case ACPI_REFCLASS_LOCAL:
 431
 432                                 /*
 433                                  * No error message for this case, will be trapped again later to
 434                                  * detect and ignore cases of Store(local_x,local_x)
 435                                  */
 436                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL);
 437
 438                         default:
 439
 440                                 ACPI_ERROR((AE_INFO,
 441                                             "Not a Arg/Local opcode: 0x%X",
 442                                             type));
 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:  type                - Either ACPI_REFCLASS_LOCAL or
 462  *                                    ACPI_REFCLASS_ARG
 463  *              index               - Which localVar or argument to delete
 464  *              walk_state          - Current walk state object
 465  *
 466  * RETURN:      None
 467  *
 468  * DESCRIPTION: Delete the entry at Opcode:Index. Inserts
 469  *              a null into the stack slot after the object is deleted.
 470  *
 471  ******************************************************************************/
 472
 473 static void
 474 acpi_ds_method_data_delete_value(u8 type,
 475                                  u32 index, struct acpi_walk_state *walk_state)
 476 {
 477         acpi_status status;
 478         struct acpi_namespace_node *node;
 479         union acpi_operand_object *object;
 480
 481         ACPI_FUNCTION_TRACE(ds_method_data_delete_value);
 482
 483         /* Get the namespace node for the arg/local */
 484
 485         status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
 486         if (ACPI_FAILURE(status)) {
 487                 return_VOID;
 488         }
 489
 490         /* Get the associated object */
 491
 492         object = acpi_ns_get_attached_object(node);
 493
 494         /*
 495          * Undefine the Arg or Local by setting its descriptor
 496          * pointer to NULL. Locals/Args can contain both
 497          * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
 498          */
 499         node->object = NULL;
 500
 501         if ((object) &&
 502             (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_OPERAND)) {
 503                 /*
 504                  * There is a valid object.
 505                  * Decrement the reference count by one to balance the
 506                  * increment when the object was stored.
 507                  */
 508                 acpi_ut_remove_reference(object);
 509         }
 510
 511         return_VOID;
 512 }
 513
 514 /*******************************************************************************
 515  *
 516  * FUNCTION:    acpi_ds_store_object_to_local
 517  *
 518  * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
 519  *                                    ACPI_REFCLASS_ARG
 520  *              index               - Which Local or Arg to set
 521  *              obj_desc            - Value to be stored
 522  *              walk_state          - Current walk state
 523  *
 524  * RETURN:      Status
 525  *
 526  * DESCRIPTION: Store a value in an Arg or Local. The obj_desc is installed
 527  *              as the new value for the Arg or Local and the reference count
 528  *              for obj_desc is incremented.
 529  *
 530  ******************************************************************************/
 531
 532 acpi_status
 533 acpi_ds_store_object_to_local(u8 type,
 534                               u32 index,
 535                               union acpi_operand_object *obj_desc,
 536                               struct acpi_walk_state *walk_state)
 537 {
 538         acpi_status status;
 539         struct acpi_namespace_node *node;
 540         union acpi_operand_object *current_obj_desc;
 541         union acpi_operand_object *new_obj_desc;
 542
 543         ACPI_FUNCTION_TRACE(ds_store_object_to_local);
 544         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n",
 545                           type, index, obj_desc));
 546
 547         /* Parameter validation */
 548
 549         if (!obj_desc) {
 550                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 551         }
 552
 553         /* Get the namespace node for the arg/local */
 554
 555         status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
 556         if (ACPI_FAILURE(status)) {
 557                 return_ACPI_STATUS(status);
 558         }
 559
 560         current_obj_desc = acpi_ns_get_attached_object(node);
 561         if (current_obj_desc == obj_desc) {
 562                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n",
 563                                   obj_desc));
 564                 return_ACPI_STATUS(status);
 565         }
 566
 567         /*
 568          * If the reference count on the object is more than one, we must
 569          * take a copy of the object before we store. A reference count
 570          * of exactly 1 means that the object was just created during the
 571          * evaluation of an expression, and we can safely use it since it
 572          * is not used anywhere else.
 573          */
 574         new_obj_desc = obj_desc;
 575         if (obj_desc->common.reference_count > 1) {
 576                 status =
 577                     acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc,
 578                                                     walk_state);
 579                 if (ACPI_FAILURE(status)) {
 580                         return_ACPI_STATUS(status);
 581                 }
 582         }
 583
 584         /*
 585          * If there is an object already in this slot, we either
 586          * have to delete it, or if this is an argument and there
 587          * is an object reference stored there, we have to do
 588          * an indirect store!
 589          */
 590         if (current_obj_desc) {
 591                 /*
 592                  * Check for an indirect store if an argument
 593                  * contains an object reference (stored as an Node).
 594                  * We don't allow this automatic dereferencing for
 595                  * locals, since a store to a local should overwrite
 596                  * anything there, including an object reference.
 597                  *
 598                  * If both Arg0 and Local0 contain ref_of (Local4):
 599                  *
 600                  * Store (1, Arg0)             - Causes indirect store to local4
 601                  * Store (1, Local0)           - Stores 1 in local0, overwriting
 602                  *                                  the reference to local4
 603                  * Store (1, de_refof (Local0)) - Causes indirect store to local4
 604                  *
 605                  * Weird, but true.
 606                  */
 607                 if (type == ACPI_REFCLASS_ARG) {
 608                         /*
 609                          * If we have a valid reference object that came from ref_of(),
 610                          * do the indirect store
 611                          */
 612                         if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) ==
 613                              ACPI_DESC_TYPE_OPERAND)
 614                             && (current_obj_desc->common.type ==
 615                                 ACPI_TYPE_LOCAL_REFERENCE)
 616                             && (current_obj_desc->reference.class ==
 617                                 ACPI_REFCLASS_REFOF)) {
 618                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 619                                                   "Arg (%p) is an ObjRef(Node), storing in node %p\n",
 620                                                   new_obj_desc,
 621                                                   current_obj_desc));
 622
 623                                 /*
 624                                  * Store this object to the Node (perform the indirect store)
 625                                  * NOTE: No implicit conversion is performed, as per the ACPI
 626                                  * specification rules on storing to Locals/Args.
 627                                  */
 628                                 status =
 629                                     acpi_ex_store_object_to_node(new_obj_desc,
 630                                                                  current_obj_desc->
 631                                                                  reference.
 632                                                                  object,
 633                                                                  walk_state,
 634                                                                  ACPI_NO_IMPLICIT_CONVERSION);
 635
 636                                 /* Remove local reference if we copied the object above */
 637
 638                                 if (new_obj_desc != obj_desc) {
 639                                         acpi_ut_remove_reference(new_obj_desc);
 640                                 }
 641                                 return_ACPI_STATUS(status);
 642                         }
 643                 }
 644
 645                 /* Delete the existing object before storing the new one */
 646
 647                 acpi_ds_method_data_delete_value(type, 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(type, 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(object->type);
 713 }
 714 #endif