LXR linux/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 - 2016, 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
  51ACPI_MODULE_NAME("dsmthdat")
  52
  53/* Local prototypes */
  54static void
  55acpi_ds_method_data_delete_value(u8 type,
  56                                 u32 index, struct acpi_walk_state *walk_state);
  57
  58static acpi_status
  59acpi_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
  65acpi_object_type
  66acpi_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
  91void 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
 103                walk_state->arguments[i].name.integer |= (i << 24);
 104                walk_state->arguments[i].descriptor_type = ACPI_DESC_TYPE_NAMED;
 105                walk_state->arguments[i].type = ACPI_TYPE_ANY;
 106                walk_state->arguments[i].flags = 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 = ANOBJ_METHOD_LOCAL;
 120        }
 121
 122        return_VOID;
 123}
 124
 125/*******************************************************************************
 126 *
 127 * FUNCTION:    acpi_ds_method_data_delete_all
 128 *
 129 * PARAMETERS:  walk_state          - Current walk state object
 130 *
 131 * RETURN:      None
 132 *
 133 * DESCRIPTION: Delete method locals and arguments. Arguments are only
 134 *              deleted if this method was called from another method.
 135 *
 136 ******************************************************************************/
 137
 138void acpi_ds_method_data_delete_all(struct acpi_walk_state *walk_state)
 139{
 140        u32 index;
 141
 142        ACPI_FUNCTION_TRACE(ds_method_data_delete_all);
 143
 144        /* Detach the locals */
 145
 146        for (index = 0; index < ACPI_METHOD_NUM_LOCALS; index++) {
 147                if (walk_state->local_variables[index].object) {
 148                        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Local%u=%p\n",
 149                                          index,
 150                                          walk_state->local_variables[index].
 151                                          object));
 152
 153                        /* Detach object (if present) and remove a reference */
 154
 155                        acpi_ns_detach_object(&walk_state->
 156                                              local_variables[index]);
 157                }
 158        }
 159
 160        /* Detach the arguments */
 161
 162        for (index = 0; index < ACPI_METHOD_NUM_ARGS; index++) {
 163                if (walk_state->arguments[index].object) {
 164                        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Arg%u=%p\n",
 165                                          index,
 166                                          walk_state->arguments[index].object));
 167
 168                        /* Detach object (if present) and remove a reference */
 169
 170                        acpi_ns_detach_object(&walk_state->arguments[index]);
 171                }
 172        }
 173
 174        return_VOID;
 175}
 176
 177/*******************************************************************************
 178 *
 179 * FUNCTION:    acpi_ds_method_data_init_args
 180 *
 181 * PARAMETERS:  *params         - Pointer to a parameter list for the method
 182 *              max_param_count - The arg count for this method
 183 *              walk_state      - Current walk state object
 184 *
 185 * RETURN:      Status
 186 *
 187 * DESCRIPTION: Initialize arguments for a method. The parameter list is a list
 188 *              of ACPI operand objects, either null terminated or whose length
 189 *              is defined by max_param_count.
 190 *
 191 ******************************************************************************/
 192
 193acpi_status
 194acpi_ds_method_data_init_args(union acpi_operand_object **params,
 195                              u32 max_param_count,
 196                              struct acpi_walk_state *walk_state)
 197{
 198        acpi_status status;
 199        u32 index = 0;
 200
 201        ACPI_FUNCTION_TRACE_PTR(ds_method_data_init_args, params);
 202
 203        if (!params) {
 204                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 205                                  "No parameter list passed to method\n"));
 206                return_ACPI_STATUS(AE_OK);
 207        }
 208
 209        /* Copy passed parameters into the new method stack frame */
 210
 211        while ((index < ACPI_METHOD_NUM_ARGS) &&
 212               (index < max_param_count) && params[index]) {
 213                /*
 214                 * A valid parameter.
 215                 * Store the argument in the method/walk descriptor.
 216                 * Do not copy the arg in order to implement call by reference
 217                 */
 218                status =
 219                    acpi_ds_method_data_set_value(ACPI_REFCLASS_ARG, index,
 220                                                  params[index], walk_state);
 221                if (ACPI_FAILURE(status)) {
 222                        return_ACPI_STATUS(status);
 223                }
 224
 225                index++;
 226        }
 227
 228        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%u args passed to method\n", index));
 229        return_ACPI_STATUS(AE_OK);
 230}
 231
 232/*******************************************************************************
 233 *
 234 * FUNCTION:    acpi_ds_method_data_get_node
 235 *
 236 * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
 237 *                                    ACPI_REFCLASS_ARG
 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
 248acpi_status
 249acpi_ds_method_data_get_node(u8 type,
 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 (type) {
 260        case ACPI_REFCLASS_LOCAL:
 261
 262                if (index > ACPI_METHOD_MAX_LOCAL) {
 263                        ACPI_ERROR((AE_INFO,
 264                                    "Local index %u is invalid (max %u)",
 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 ACPI_REFCLASS_ARG:
 275
 276                if (index > ACPI_METHOD_MAX_ARG) {
 277                        ACPI_ERROR((AE_INFO,
 278                                    "Arg index %u is invalid (max %u)",
 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
 290                ACPI_ERROR((AE_INFO, "Type %u is invalid", type));
 291                return_ACPI_STATUS(AE_TYPE);
 292        }
 293
 294        return_ACPI_STATUS(AE_OK);
 295}
 296
 297/*******************************************************************************
 298 *
 299 * FUNCTION:    acpi_ds_method_data_set_value
 300 *
 301 * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
 302 *                                    ACPI_REFCLASS_ARG
 303 *              index               - Which Local or Arg to get
 304 *              object              - Object to be inserted into the stack entry
 305 *              walk_state          - Current walk state object
 306 *
 307 * RETURN:      Status
 308 *
 309 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
 310 *              Note: There is no "implicit conversion" for locals.
 311 *
 312 ******************************************************************************/
 313
 314static acpi_status
 315acpi_ds_method_data_set_value(u8 type,
 316                              u32 index,
 317                              union acpi_operand_object *object,
 318                              struct acpi_walk_state *walk_state)
 319{
 320        acpi_status status;
 321        struct acpi_namespace_node *node;
 322
 323        ACPI_FUNCTION_TRACE(ds_method_data_set_value);
 324
 325        ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 326                          "NewObj %p Type %2.2X, Refs=%u [%s]\n", object,
 327                          type, object->common.reference_count,
 328                          acpi_ut_get_type_name(object->common.type)));
 329
 330        /* Get the namespace node for the arg/local */
 331
 332        status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
 333        if (ACPI_FAILURE(status)) {
 334                return_ACPI_STATUS(status);
 335        }
 336
 337        /*
 338         * Increment ref count so object can't be deleted while installed.
 339         * NOTE: We do not copy the object in order to preserve the call by
 340         * reference semantics of ACPI Control Method invocation.
 341         * (See ACPI Specification 2.0C)
 342         */
 343        acpi_ut_add_reference(object);
 344
 345        /* Install the object */
 346
 347        node->object = object;
 348        return_ACPI_STATUS(status);
 349}
 350
 351/*******************************************************************************
 352 *
 353 * FUNCTION:    acpi_ds_method_data_get_value
 354 *
 355 * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
 356 *                                    ACPI_REFCLASS_ARG
 357 *              index               - Which localVar or argument to get
 358 *              walk_state          - Current walk state object
 359 *              dest_desc           - Where Arg or Local value is returned
 360 *
 361 * RETURN:      Status
 362 *
 363 * DESCRIPTION: Retrieve value of selected Arg or Local for this method
 364 *              Used only in acpi_ex_resolve_to_value().
 365 *
 366 ******************************************************************************/
 367
 368acpi_status
 369acpi_ds_method_data_get_value(u8 type,
 370                              u32 index,
 371                              struct acpi_walk_state *walk_state,
 372                              union acpi_operand_object **dest_desc)
 373{
 374        acpi_status status;
 375        struct acpi_namespace_node *node;
 376        union acpi_operand_object *object;
 377
 378        ACPI_FUNCTION_TRACE(ds_method_data_get_value);
 379
 380        /* Validate the object descriptor */
 381
 382        if (!dest_desc) {
 383                ACPI_ERROR((AE_INFO, "Null object descriptor pointer"));
 384                return_ACPI_STATUS(AE_BAD_PARAMETER);
 385        }
 386
 387        /* Get the namespace node for the arg/local */
 388
 389        status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
 390        if (ACPI_FAILURE(status)) {
 391                return_ACPI_STATUS(status);
 392        }
 393
 394        /* Get the object from the node */
 395
 396        object = node->object;
 397
 398        /* Examine the returned object, it must be valid. */
 399
 400        if (!object) {
 401                /*
 402                 * Index points to uninitialized object.
 403                 * This means that either 1) The expected argument was
 404                 * not passed to the method, or 2) A local variable
 405                 * was referenced by the method (via the ASL)
 406                 * before it was initialized. Either case is an error.
 407                 */
 408
 409                /* If slack enabled, init the local_x/arg_x to an Integer of value zero */
 410
 411                if (acpi_gbl_enable_interpreter_slack) {
 412                        object = acpi_ut_create_integer_object((u64) 0);
 413                        if (!object) {
 414                                return_ACPI_STATUS(AE_NO_MEMORY);
 415                        }
 416
 417                        node->object = object;
 418                }
 419
 420                /* Otherwise, return the error */
 421
 422                else
 423                        switch (type) {
 424                        case ACPI_REFCLASS_ARG:
 425
 426                                ACPI_ERROR((AE_INFO,
 427                                            "Uninitialized Arg[%u] at node %p",
 428                                            index, node));
 429
 430                                return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG);
 431
 432                        case ACPI_REFCLASS_LOCAL:
 433                                /*
 434                                 * No error message for this case, will be trapped again later to
 435                                 * detect and ignore cases of Store(local_x,local_x)
 436                                 */
 437                                return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL);
 438
 439                        default:
 440
 441                                ACPI_ERROR((AE_INFO,
 442                                            "Not a Arg/Local opcode: 0x%X",
 443                                            type));
 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:  type                - Either ACPI_REFCLASS_LOCAL or
 463 *                                    ACPI_REFCLASS_ARG
 464 *              index               - Which localVar or argument to delete
 465 *              walk_state          - Current walk state object
 466 *
 467 * RETURN:      None
 468 *
 469 * DESCRIPTION: Delete the entry at Opcode:Index. Inserts
 470 *              a null into the stack slot after the object is deleted.
 471 *
 472 ******************************************************************************/
 473
 474static void
 475acpi_ds_method_data_delete_value(u8 type,
 476                                 u32 index, struct acpi_walk_state *walk_state)
 477{
 478        acpi_status status;
 479        struct acpi_namespace_node *node;
 480        union acpi_operand_object *object;
 481
 482        ACPI_FUNCTION_TRACE(ds_method_data_delete_value);
 483
 484        /* Get the namespace node for the arg/local */
 485
 486        status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
 487        if (ACPI_FAILURE(status)) {
 488                return_VOID;
 489        }
 490
 491        /* Get the associated object */
 492
 493        object = acpi_ns_get_attached_object(node);
 494
 495        /*
 496         * Undefine the Arg or Local by setting its descriptor
 497         * pointer to NULL. Locals/Args can contain both
 498         * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
 499         */
 500        node->object = NULL;
 501
 502        if ((object) &&
 503            (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_OPERAND)) {
 504                /*
 505                 * There is a valid object.
 506                 * Decrement the reference count by one to balance the
 507                 * increment when the object was stored.
 508                 */
 509                acpi_ut_remove_reference(object);
 510        }
 511
 512        return_VOID;
 513}
 514
 515/*******************************************************************************
 516 *
 517 * FUNCTION:    acpi_ds_store_object_to_local
 518 *
 519 * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
 520 *                                    ACPI_REFCLASS_ARG
 521 *              index               - Which Local or Arg to set
 522 *              obj_desc            - Value to be stored
 523 *              walk_state          - Current walk state
 524 *
 525 * RETURN:      Status
 526 *
 527 * DESCRIPTION: Store a value in an Arg or Local. The obj_desc is installed
 528 *              as the new value for the Arg or Local and the reference count
 529 *              for obj_desc is incremented.
 530 *
 531 ******************************************************************************/
 532
 533acpi_status
 534acpi_ds_store_object_to_local(u8 type,
 535                              u32 index,
 536                              union acpi_operand_object *obj_desc,
 537                              struct acpi_walk_state *walk_state)
 538{
 539        acpi_status status;
 540        struct acpi_namespace_node *node;
 541        union acpi_operand_object *current_obj_desc;
 542        union acpi_operand_object *new_obj_desc;
 543
 544        ACPI_FUNCTION_TRACE(ds_store_object_to_local);
 545        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n",
 546                          type, index, obj_desc));
 547
 548        /* Parameter validation */
 549
 550        if (!obj_desc) {
 551                return_ACPI_STATUS(AE_BAD_PARAMETER);
 552        }
 553
 554        /* Get the namespace node for the arg/local */
 555
 556        status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
 557        if (ACPI_FAILURE(status)) {
 558                return_ACPI_STATUS(status);
 559        }
 560
 561        current_obj_desc = acpi_ns_get_attached_object(node);
 562        if (current_obj_desc == obj_desc) {
 563                ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n",
 564                                  obj_desc));
 565                return_ACPI_STATUS(status);
 566        }
 567
 568        /*
 569         * If the reference count on the object is more than one, we must
 570         * take a copy of the object before we store. A reference count
 571         * of exactly 1 means that the object was just created during the
 572         * evaluation of an expression, and we can safely use it since it
 573         * is not used anywhere else.
 574         */
 575        new_obj_desc = obj_desc;
 576        if (obj_desc->common.reference_count > 1) {
 577                status =
 578                    acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc,
 579                                                    walk_state);
 580                if (ACPI_FAILURE(status)) {
 581                        return_ACPI_STATUS(status);
 582                }
 583        }
 584
 585        /*
 586         * If there is an object already in this slot, we either
 587         * have to delete it, or if this is an argument and there
 588         * is an object reference stored there, we have to do
 589         * an indirect store!
 590         */
 591        if (current_obj_desc) {
 592                /*
 593                 * Check for an indirect store if an argument
 594                 * contains an object reference (stored as an Node).
 595                 * We don't allow this automatic dereferencing for
 596                 * locals, since a store to a local should overwrite
 597                 * anything there, including an object reference.
 598                 *
 599                 * If both Arg0 and Local0 contain ref_of (Local4):
 600                 *
 601                 * Store (1, Arg0)             - Causes indirect store to local4
 602                 * Store (1, Local0)           - Stores 1 in local0, overwriting
 603                 *                                  the reference to local4
 604                 * Store (1, de_refof (Local0)) - Causes indirect store to local4
 605                 *
 606                 * Weird, but true.
 607                 */
 608                if (type == ACPI_REFCLASS_ARG) {
 609                        /*
 610                         * If we have a valid reference object that came from ref_of(),
 611                         * do the indirect store
 612                         */
 613                        if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) ==
 614                             ACPI_DESC_TYPE_OPERAND) &&
 615                            (current_obj_desc->common.type ==
 616                             ACPI_TYPE_LOCAL_REFERENCE) &&
 617                            (current_obj_desc->reference.class ==
 618                             ACPI_REFCLASS_REFOF)) {
 619                                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 620                                                  "Arg (%p) is an ObjRef(Node), storing in node %p\n",
 621                                                  new_obj_desc,
 622                                                  current_obj_desc));
 623
 624                                /*
 625                                 * Store this object to the Node (perform the indirect store)
 626                                 * NOTE: No implicit conversion is performed, as per the ACPI
 627                                 * specification rules on storing to Locals/Args.
 628                                 */
 629                                status =
 630                                    acpi_ex_store_object_to_node(new_obj_desc,
 631                                                                 current_obj_desc->
 632                                                                 reference.
 633                                                                 object,
 634                                                                 walk_state,
 635                                                                 ACPI_NO_IMPLICIT_CONVERSION);
 636
 637                                /* Remove local reference if we copied the object above */
 638
 639                                if (new_obj_desc != obj_desc) {
 640                                        acpi_ut_remove_reference(new_obj_desc);
 641                                }
 642
 643                                return_ACPI_STATUS(status);
 644                        }
 645                }
 646
 647                /* Delete the existing object before storing the new one */
 648
 649                acpi_ds_method_data_delete_value(type, index, walk_state);
 650        }
 651
 652        /*
 653         * Install the Obj descriptor (*new_obj_desc) into
 654         * the descriptor for the Arg or Local.
 655         * (increments the object reference count by one)
 656         */
 657        status =
 658            acpi_ds_method_data_set_value(type, index, new_obj_desc,
 659                                          walk_state);
 660
 661        /* Remove local reference if we copied the object above */
 662
 663        if (new_obj_desc != obj_desc) {
 664                acpi_ut_remove_reference(new_obj_desc);
 665        }
 666
 667        return_ACPI_STATUS(status);
 668}
 669
 670#ifdef ACPI_OBSOLETE_FUNCTIONS
 671/*******************************************************************************
 672 *
 673 * FUNCTION:    acpi_ds_method_data_get_type
 674 *
 675 * PARAMETERS:  opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 676 *              index               - Which Local or Arg whose type to get
 677 *              walk_state          - Current walk state object
 678 *
 679 * RETURN:      Data type of current value of the selected Arg or Local
 680 *
 681 * DESCRIPTION: Get the type of the object stored in the Local or Arg
 682 *
 683 ******************************************************************************/
 684
 685acpi_object_type
 686acpi_ds_method_data_get_type(u16 opcode,
 687                             u32 index, struct acpi_walk_state *walk_state)
 688{
 689        acpi_status status;
 690        struct acpi_namespace_node *node;
 691        union acpi_operand_object *object;
 692
 693        ACPI_FUNCTION_TRACE(ds_method_data_get_type);
 694
 695        /* Get the namespace node for the arg/local */
 696
 697        status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 698        if (ACPI_FAILURE(status)) {
 699                return_VALUE((ACPI_TYPE_NOT_FOUND));
 700        }
 701
 702        /* Get the object */
 703
 704        object = acpi_ns_get_attached_object(node);
 705        if (!object) {
 706
 707                /* Uninitialized local/arg, return TYPE_ANY */
 708
 709                return_VALUE(ACPI_TYPE_ANY);
 710        }
 711
 712        /* Get the object type */
 713
 714        return_VALUE(object->type);
 715}
 716#endif
 717