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 - 2008, 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 =
 106                     ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG;
 107         }
 108
 109         /* Init the method locals */
 110
 111         for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) {
 112                 ACPI_MOVE_32_TO_32(&walk_state->local_variables[i].name,
 113                                    NAMEOF_LOCAL_NTE);
 114
 115                 walk_state->local_variables[i].name.integer |= (i << 24);
 116                 walk_state->local_variables[i].descriptor_type =
 117                     ACPI_DESC_TYPE_NAMED;
 118                 walk_state->local_variables[i].type = ACPI_TYPE_ANY;
 119                 walk_state->local_variables[i].flags =
 120                     ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL;
 121         }
 122
 123         return_VOID;
 124 }
 125
 126 /*******************************************************************************
 127  *
 128  * FUNCTION:    acpi_ds_method_data_delete_all
 129  *
 130  * PARAMETERS:  walk_state          - Current walk state object
 131  *
 132  * RETURN:      None
 133  *
 134  * DESCRIPTION: Delete method locals and arguments.  Arguments are only
 135  *              deleted if this method was called from another method.
 136  *
 137  ******************************************************************************/
 138
 139 void acpi_ds_method_data_delete_all(struct acpi_walk_state *walk_state)
 140 {
 141         u32 index;
 142
 143         ACPI_FUNCTION_TRACE(ds_method_data_delete_all);
 144
 145         /* Detach the locals */
 146
 147         for (index = 0; index < ACPI_METHOD_NUM_LOCALS; index++) {
 148                 if (walk_state->local_variables[index].object) {
 149                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Local%d=%p\n",
 150                                           index,
 151                                           walk_state->local_variables[index].
 152                                           object));
 153
 154                         /* Detach object (if present) and remove a reference */
 155
 156                         acpi_ns_detach_object(&walk_state->
 157                                               local_variables[index]);
 158                 }
 159         }
 160
 161         /* Detach the arguments */
 162
 163         for (index = 0; index < ACPI_METHOD_NUM_ARGS; index++) {
 164                 if (walk_state->arguments[index].object) {
 165                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Arg%d=%p\n",
 166                                           index,
 167                                           walk_state->arguments[index].object));
 168
 169                         /* Detach object (if present) and remove a reference */
 170
 171                         acpi_ns_detach_object(&walk_state->arguments[index]);
 172                 }
 173         }
 174
 175         return_VOID;
 176 }
 177
 178 /*******************************************************************************
 179  *
 180  * FUNCTION:    acpi_ds_method_data_init_args
 181  *
 182  * PARAMETERS:  *Params         - Pointer to a parameter list for the method
 183  *              max_param_count - The arg count for this method
 184  *              walk_state      - Current walk state object
 185  *
 186  * RETURN:      Status
 187  *
 188  * DESCRIPTION: Initialize arguments for a method.  The parameter list is a list
 189  *              of ACPI operand objects, either null terminated or whose length
 190  *              is defined by max_param_count.
 191  *
 192  ******************************************************************************/
 193
 194 acpi_status
 195 acpi_ds_method_data_init_args(union acpi_operand_object **params,
 196                               u32 max_param_count,
 197                               struct acpi_walk_state *walk_state)
 198 {
 199         acpi_status status;
 200         u32 index = 0;
 201
 202         ACPI_FUNCTION_TRACE_PTR(ds_method_data_init_args, params);
 203
 204         if (!params) {
 205                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 206                                   "No param list passed to method\n"));
 207                 return_ACPI_STATUS(AE_OK);
 208         }
 209
 210         /* Copy passed parameters into the new method stack frame */
 211
 212         while ((index < ACPI_METHOD_NUM_ARGS) &&
 213                (index < max_param_count) && params[index]) {
 214                 /*
 215                  * A valid parameter.
 216                  * Store the argument in the method/walk descriptor.
 217                  * Do not copy the arg in order to implement call by reference
 218                  */
 219                 status = acpi_ds_method_data_set_value(ACPI_REFCLASS_ARG, 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:  Type                - Either ACPI_REFCLASS_LOCAL or
 238  *                                    ACPI_REFCLASS_ARG
 239  *              Index               - Which Local or Arg whose type to get
 240  *              walk_state          - Current walk state object
 241  *              Node                - Where the node is returned.
 242  *
 243  * RETURN:      Status and node
 244  *
 245  * DESCRIPTION: Get the Node associated with a local or arg.
 246  *
 247  ******************************************************************************/
 248
 249 acpi_status
 250 acpi_ds_method_data_get_node(u8 type,
 251                              u32 index,
 252                              struct acpi_walk_state *walk_state,
 253                              struct acpi_namespace_node **node)
 254 {
 255         ACPI_FUNCTION_TRACE(ds_method_data_get_node);
 256
 257         /*
 258          * Method Locals and Arguments are supported
 259          */
 260         switch (type) {
 261         case ACPI_REFCLASS_LOCAL:
 262
 263                 if (index > ACPI_METHOD_MAX_LOCAL) {
 264                         ACPI_ERROR((AE_INFO,
 265                                     "Local index %d is invalid (max %d)",
 266                                     index, ACPI_METHOD_MAX_LOCAL));
 267                         return_ACPI_STATUS(AE_AML_INVALID_INDEX);
 268                 }
 269
 270                 /* Return a pointer to the pseudo-node */
 271
 272                 *node = &walk_state->local_variables[index];
 273                 break;
 274
 275         case ACPI_REFCLASS_ARG:
 276
 277                 if (index > ACPI_METHOD_MAX_ARG) {
 278                         ACPI_ERROR((AE_INFO,
 279                                     "Arg index %d is invalid (max %d)",
 280                                     index, ACPI_METHOD_MAX_ARG));
 281                         return_ACPI_STATUS(AE_AML_INVALID_INDEX);
 282                 }
 283
 284                 /* Return a pointer to the pseudo-node */
 285
 286                 *node = &walk_state->arguments[index];
 287                 break;
 288
 289         default:
 290                 ACPI_ERROR((AE_INFO, "Type %d 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
 314 static acpi_status
 315 acpi_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=%d [%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 2.0_c)
 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 local_var 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
 368 acpi_status
 369 acpi_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[%d] at node %p",
 428                                             index, node));
 429
 430                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG);
 431
 432                         case ACPI_REFCLASS_LOCAL:
 433
 434                                 /*
 435                                  * No error message for this case, will be trapped again later to
 436                                  * detect and ignore cases of Store(local_x,local_x)
 437                                  */
 438                                 return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL);
 439
 440                         default:
 441
 442                                 ACPI_ERROR((AE_INFO,
 443                                             "Not a Arg/Local opcode: %X",
 444                                             type));
 445                                 return_ACPI_STATUS(AE_AML_INTERNAL);
 446                         }
 447         }
 448
 449         /*
 450          * The Index points to an initialized and valid object.
 451          * Return an additional reference to the object
 452          */
 453         *dest_desc = object;
 454         acpi_ut_add_reference(object);
 455
 456         return_ACPI_STATUS(AE_OK);
 457 }
 458
 459 /*******************************************************************************
 460  *
 461  * FUNCTION:    acpi_ds_method_data_delete_value
 462  *
 463  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
 464  *                                    ACPI_REFCLASS_ARG
 465  *              Index               - Which local_var or argument to delete
 466  *              walk_state          - Current walk state object
 467  *
 468  * RETURN:      None
 469  *
 470  * DESCRIPTION: Delete the entry at Opcode:Index.  Inserts
 471  *              a null into the stack slot after the object is deleted.
 472  *
 473  ******************************************************************************/
 474
 475 static void
 476 acpi_ds_method_data_delete_value(u8 type,
 477                                  u32 index, struct acpi_walk_state *walk_state)
 478 {
 479         acpi_status status;
 480         struct acpi_namespace_node *node;
 481         union acpi_operand_object *object;
 482
 483         ACPI_FUNCTION_TRACE(ds_method_data_delete_value);
 484
 485         /* Get the namespace node for the arg/local */
 486
 487         status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
 488         if (ACPI_FAILURE(status)) {
 489                 return_VOID;
 490         }
 491
 492         /* Get the associated object */
 493
 494         object = acpi_ns_get_attached_object(node);
 495
 496         /*
 497          * Undefine the Arg or Local by setting its descriptor
 498          * pointer to NULL. Locals/Args can contain both
 499          * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
 500          */
 501         node->object = NULL;
 502
 503         if ((object) &&
 504             (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_OPERAND)) {
 505                 /*
 506                  * There is a valid object.
 507                  * Decrement the reference count by one to balance the
 508                  * increment when the object was stored.
 509                  */
 510                 acpi_ut_remove_reference(object);
 511         }
 512
 513         return_VOID;
 514 }
 515
 516 /*******************************************************************************
 517  *
 518  * FUNCTION:    acpi_ds_store_object_to_local
 519  *
 520  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
 521  *                                    ACPI_REFCLASS_ARG
 522  *              Index               - Which Local or Arg to set
 523  *              obj_desc            - Value to be stored
 524  *              walk_state          - Current walk state
 525  *
 526  * RETURN:      Status
 527  *
 528  * DESCRIPTION: Store a value in an Arg or Local.  The obj_desc is installed
 529  *              as the new value for the Arg or Local and the reference count
 530  *              for obj_desc is incremented.
 531  *
 532  ******************************************************************************/
 533
 534 acpi_status
 535 acpi_ds_store_object_to_local(u8 type,
 536                               u32 index,
 537                               union acpi_operand_object *obj_desc,
 538                               struct acpi_walk_state *walk_state)
 539 {
 540         acpi_status status;
 541         struct acpi_namespace_node *node;
 542         union acpi_operand_object *current_obj_desc;
 543         union acpi_operand_object *new_obj_desc;
 544
 545         ACPI_FUNCTION_TRACE(ds_store_object_to_local);
 546         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Type=%2.2X Index=%d Obj=%p\n",
 547                           type, index, obj_desc));
 548
 549         /* Parameter validation */
 550
 551         if (!obj_desc) {
 552                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 553         }
 554
 555         /* Get the namespace node for the arg/local */
 556
 557         status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
 558         if (ACPI_FAILURE(status)) {
 559                 return_ACPI_STATUS(status);
 560         }
 561
 562         current_obj_desc = acpi_ns_get_attached_object(node);
 563         if (current_obj_desc == obj_desc) {
 564                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n",
 565                                   obj_desc));
 566                 return_ACPI_STATUS(status);
 567         }
 568
 569         /*
 570          * If the reference count on the object is more than one, we must
 571          * take a copy of the object before we store.  A reference count
 572          * of exactly 1 means that the object was just created during the
 573          * evaluation of an expression, and we can safely use it since it
 574          * is not used anywhere else.
 575          */
 576         new_obj_desc = obj_desc;
 577         if (obj_desc->common.reference_count > 1) {
 578                 status =
 579                     acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc,
 580                                                     walk_state);
 581                 if (ACPI_FAILURE(status)) {
 582                         return_ACPI_STATUS(status);
 583                 }
 584         }
 585
 586         /*
 587          * If there is an object already in this slot, we either
 588          * have to delete it, or if this is an argument and there
 589          * is an object reference stored there, we have to do
 590          * an indirect store!
 591          */
 592         if (current_obj_desc) {
 593                 /*
 594                  * Check for an indirect store if an argument
 595                  * contains an object reference (stored as an Node).
 596                  * We don't allow this automatic dereferencing for
 597                  * locals, since a store to a local should overwrite
 598                  * anything there, including an object reference.
 599                  *
 600                  * If both Arg0 and Local0 contain ref_of (Local4):
 601                  *
 602                  * Store (1, Arg0)             - Causes indirect store to local4
 603                  * Store (1, Local0)           - Stores 1 in local0, overwriting
 604                  *                                  the reference to local4
 605                  * Store (1, de_refof (Local0)) - Causes indirect store to local4
 606                  *
 607                  * Weird, but true.
 608                  */
 609                 if (type == ACPI_REFCLASS_ARG) {
 610                         /*
 611                          * If we have a valid reference object that came from ref_of(),
 612                          * do the indirect store
 613                          */
 614                         if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) ==
 615                              ACPI_DESC_TYPE_OPERAND)
 616                             && (current_obj_desc->common.type ==
 617                                 ACPI_TYPE_LOCAL_REFERENCE)
 618                             && (current_obj_desc->reference.class ==
 619                                 ACPI_REFCLASS_REFOF)) {
 620                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 621                                                   "Arg (%p) is an ObjRef(Node), storing in node %p\n",
 622                                                   new_obj_desc,
 623                                                   current_obj_desc));
 624
 625                                 /*
 626                                  * Store this object to the Node (perform the indirect store)
 627                                  * NOTE: No implicit conversion is performed, as per the ACPI
 628                                  * specification rules on storing to Locals/Args.
 629                                  */
 630                                 status =
 631                                     acpi_ex_store_object_to_node(new_obj_desc,
 632                                                                  current_obj_desc->
 633                                                                  reference.
 634                                                                  object,
 635                                                                  walk_state,
 636                                                                  ACPI_NO_IMPLICIT_CONVERSION);
 637
 638                                 /* Remove local reference if we copied the object above */
 639
 640                                 if (new_obj_desc != obj_desc) {
 641                                         acpi_ut_remove_reference(new_obj_desc);
 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
 685 acpi_object_type
 686 acpi_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