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 - 2005, 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_DEBUG_PRINT((ACPI_DB_ERROR,
 264                                           "Local index %d is invalid (max %d)\n",
 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_DEBUG_PRINT((ACPI_DB_ERROR,
 278                                           "Arg index %d is invalid (max %d)\n",
 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_DEBUG_PRINT((ACPI_DB_ERROR, "Opcode %d is invalid\n",
 290                                   opcode));
 291                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 292         }
 293
 294         return_ACPI_STATUS(AE_OK);
 295 }
 296
 297 /*******************************************************************************
 298  *
 299  * FUNCTION:    acpi_ds_method_data_set_value
 300  *
 301  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 302  *              Index               - Which Local or Arg to get
 303  *              Object              - Object to be inserted into the stack entry
 304  *              walk_state          - Current walk state object
 305  *
 306  * RETURN:      Status
 307  *
 308  * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
 309  *              Note: There is no "implicit conversion" for locals.
 310  *
 311  ******************************************************************************/
 312
 313 static acpi_status
 314 acpi_ds_method_data_set_value(u16 opcode,
 315                               u32 index,
 316                               union acpi_operand_object *object,
 317                               struct acpi_walk_state *walk_state)
 318 {
 319         acpi_status status;
 320         struct acpi_namespace_node *node;
 321
 322         ACPI_FUNCTION_TRACE("ds_method_data_set_value");
 323
 324         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 325                           "new_obj %p Opcode %X, Refs=%d [%s]\n", object,
 326                           opcode, object->common.reference_count,
 327                           acpi_ut_get_type_name(object->common.type)));
 328
 329         /* Get the namespace node for the arg/local */
 330
 331         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 332         if (ACPI_FAILURE(status)) {
 333                 return_ACPI_STATUS(status);
 334         }
 335
 336         /*
 337          * Increment ref count so object can't be deleted while installed.
 338          * NOTE: We do not copy the object in order to preserve the call by
 339          * reference semantics of ACPI Control Method invocation.
 340          * (See ACPI specification 2.0_c)
 341          */
 342         acpi_ut_add_reference(object);
 343
 344         /* Install the object */
 345
 346         node->object = object;
 347         return_ACPI_STATUS(status);
 348 }
 349
 350 /*******************************************************************************
 351  *
 352  * FUNCTION:    acpi_ds_method_data_get_value
 353  *
 354  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 355  *              Index               - which local_var 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(u16 opcode,
 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_DEBUG_PRINT((ACPI_DB_ERROR,
 382                                   "Null object descriptor pointer\n"));
 383                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 384         }
 385
 386         /* Get the namespace node for the arg/local */
 387
 388         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 389         if (ACPI_FAILURE(status)) {
 390                 return_ACPI_STATUS(status);
 391         }
 392
 393         /* Get the object from the node */
 394
 395         object = node->object;
 396
 397         /* Examine the returned object, it must be valid. */
 398
 399         if (!object) {
 400                 /*
 401                  * Index points to uninitialized object.
 402                  * This means that either 1) The expected argument was
 403                  * not passed to the method, or 2) A local variable
 404                  * was referenced by the method (via the ASL)
 405                  * before it was initialized.  Either case is an error.
 406                  */
 407
 408                 /* If slack enabled, init the local_x/arg_x to an Integer of value zero */
 409
 410                 if (acpi_gbl_enable_interpreter_slack) {
 411                         object =
 412                             acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 413                         if (!object) {
 414                                 return_ACPI_STATUS(AE_NO_MEMORY);
 415                         }
 416
 417                         object->integer.value = 0;
 418                         node->object = object;
 419                 }
 420
 421                 /* Otherwise, return the error */
 422
 423                 else
 424                         switch (opcode) {
 425                         case AML_ARG_OP:
 426
 427                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 428                                                   "Uninitialized Arg[%d] at node %p\n",
 429                                                   index, node));
 430
 431                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG);
 432
 433                         case AML_LOCAL_OP:
 434
 435                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 436                                                   "Uninitialized Local[%d] at node %p\n",
 437                                                   index, node));
 438
 439                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL);
 440
 441                         default:
 442                                 ACPI_REPORT_ERROR(("Not Arg/Local opcode: %X\n",
 443                                                    opcode));
 444                                 return_ACPI_STATUS(AE_AML_INTERNAL);
 445                         }
 446         }
 447
 448         /*
 449          * The Index points to an initialized and valid object.
 450          * Return an additional reference to the object
 451          */
 452         *dest_desc = object;
 453         acpi_ut_add_reference(object);
 454
 455         return_ACPI_STATUS(AE_OK);
 456 }
 457
 458 /*******************************************************************************
 459  *
 460  * FUNCTION:    acpi_ds_method_data_delete_value
 461  *
 462  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 463  *              Index               - which local_var 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(u16 opcode,
 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(opcode, 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:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 519  *              Index               - Which Local or Arg to set
 520  *              obj_desc            - Value to be stored
 521  *              walk_state          - Current walk state
 522  *
 523  * RETURN:      Status
 524  *
 525  * DESCRIPTION: Store a value in an Arg or Local.  The obj_desc is installed
 526  *              as the new value for the Arg or Local and the reference count
 527  *              for obj_desc is incremented.
 528  *
 529  ******************************************************************************/
 530
 531 acpi_status
 532 acpi_ds_store_object_to_local(u16 opcode,
 533                               u32 index,
 534                               union acpi_operand_object *obj_desc,
 535                               struct acpi_walk_state *walk_state)
 536 {
 537         acpi_status status;
 538         struct acpi_namespace_node *node;
 539         union acpi_operand_object *current_obj_desc;
 540         union acpi_operand_object *new_obj_desc;
 541
 542         ACPI_FUNCTION_TRACE("ds_store_object_to_local");
 543         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Opcode=%X Index=%d Obj=%p\n",
 544                           opcode, index, obj_desc));
 545
 546         /* Parameter validation */
 547
 548         if (!obj_desc) {
 549                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 550         }
 551
 552         /* Get the namespace node for the arg/local */
 553
 554         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 555         if (ACPI_FAILURE(status)) {
 556                 return_ACPI_STATUS(status);
 557         }
 558
 559         current_obj_desc = acpi_ns_get_attached_object(node);
 560         if (current_obj_desc == obj_desc) {
 561                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n",
 562                                   obj_desc));
 563                 return_ACPI_STATUS(status);
 564         }
 565
 566         /*
 567          * If the reference count on the object is more than one, we must
 568          * take a copy of the object before we store.  A reference count
 569          * of exactly 1 means that the object was just created during the
 570          * evaluation of an expression, and we can safely use it since it
 571          * is not used anywhere else.
 572          */
 573         new_obj_desc = obj_desc;
 574         if (obj_desc->common.reference_count > 1) {
 575                 status =
 576                     acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc,
 577                                                     walk_state);
 578                 if (ACPI_FAILURE(status)) {
 579                         return_ACPI_STATUS(status);
 580                 }
 581         }
 582
 583         /*
 584          * If there is an object already in this slot, we either
 585          * have to delete it, or if this is an argument and there
 586          * is an object reference stored there, we have to do
 587          * an indirect store!
 588          */
 589         if (current_obj_desc) {
 590                 /*
 591                  * Check for an indirect store if an argument
 592                  * contains an object reference (stored as an Node).
 593                  * We don't allow this automatic dereferencing for
 594                  * locals, since a store to a local should overwrite
 595                  * anything there, including an object reference.
 596                  *
 597                  * If both Arg0 and Local0 contain ref_of (Local4):
 598                  *
 599                  * Store (1, Arg0)             - Causes indirect store to local4
 600                  * Store (1, Local0)           - Stores 1 in local0, overwriting
 601                  *                                  the reference to local4
 602                  * Store (1, de_refof (Local0)) - Causes indirect store to local4
 603                  *
 604                  * Weird, but true.
 605                  */
 606                 if (opcode == AML_ARG_OP) {
 607                         /*
 608                          * If we have a valid reference object that came from ref_of(),
 609                          * do the indirect store
 610                          */
 611                         if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) ==
 612                              ACPI_DESC_TYPE_OPERAND)
 613                             && (current_obj_desc->common.type ==
 614                                 ACPI_TYPE_LOCAL_REFERENCE)
 615                             && (current_obj_desc->reference.opcode ==
 616                                 AML_REF_OF_OP)) {
 617                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 618                                                   "Arg (%p) is an obj_ref(Node), storing in node %p\n",
 619                                                   new_obj_desc,
 620                                                   current_obj_desc));
 621
 622                                 /*
 623                                  * Store this object to the Node (perform the indirect store)
 624                                  * NOTE: No implicit conversion is performed, as per the ACPI
 625                                  * specification rules on storing to Locals/Args.
 626                                  */
 627                                 status =
 628                                     acpi_ex_store_object_to_node(new_obj_desc,
 629                                                                  current_obj_desc->
 630                                                                  reference.
 631                                                                  object,
 632                                                                  walk_state,
 633                                                                  ACPI_NO_IMPLICIT_CONVERSION);
 634
 635                                 /* Remove local reference if we copied the object above */
 636
 637                                 if (new_obj_desc != obj_desc) {
 638                                         acpi_ut_remove_reference(new_obj_desc);
 639                                 }
 640                                 return_ACPI_STATUS(status);
 641                         }
 642                 }
 643
 644                 /*
 645                  * Delete the existing object
 646                  * before storing the new one
 647                  */
 648                 acpi_ds_method_data_delete_value(opcode, index, walk_state);
 649         }
 650
 651         /*
 652          * Install the Obj descriptor (*new_obj_desc) into
 653          * the descriptor for the Arg or Local.
 654          * (increments the object reference count by one)
 655          */
 656         status =
 657             acpi_ds_method_data_set_value(opcode, index, new_obj_desc,
 658                                           walk_state);
 659
 660         /* Remove local reference if we copied the object above */
 661
 662         if (new_obj_desc != obj_desc) {
 663                 acpi_ut_remove_reference(new_obj_desc);
 664         }
 665
 666         return_ACPI_STATUS(status);
 667 }
 668
 669 #ifdef ACPI_OBSOLETE_FUNCTIONS
 670 /*******************************************************************************
 671  *
 672  * FUNCTION:    acpi_ds_method_data_get_type
 673  *
 674  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 675  *              Index               - Which Local or Arg whose type to get
 676  *              walk_state          - Current walk state object
 677  *
 678  * RETURN:      Data type of current value of the selected Arg or Local
 679  *
 680  * DESCRIPTION: Get the type of the object stored in the Local or Arg
 681  *
 682  ******************************************************************************/
 683
 684 acpi_object_type
 685 acpi_ds_method_data_get_type(u16 opcode,
 686                              u32 index, struct acpi_walk_state *walk_state)
 687 {
 688         acpi_status status;
 689         struct acpi_namespace_node *node;
 690         union acpi_operand_object *object;
 691
 692         ACPI_FUNCTION_TRACE("ds_method_data_get_type");
 693
 694         /* Get the namespace node for the arg/local */
 695
 696         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 697         if (ACPI_FAILURE(status)) {
 698                 return_VALUE((ACPI_TYPE_NOT_FOUND));
 699         }
 700
 701         /* Get the object */
 702
 703         object = acpi_ns_get_attached_object(node);
 704         if (!object) {
 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