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 - 2017, 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
 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
 138 void 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
 193 acpi_status
 194 acpi_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
 248 acpi_status
 249 acpi_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
 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=%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
 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[%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
 474 static void
 475 acpi_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
 533 acpi_status
 534 acpi_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_FIRST LOCAL_OP or
 676  *                                    AML_FIRST_ARG_OP
 677  *              index               - Which Local or Arg whose type to get
 678  *              walk_state          - Current walk state object
 679  *
 680  * RETURN:      Data type of current value of the selected Arg or Local
 681  *
 682  * DESCRIPTION: Get the type of the object stored in the Local or Arg
 683  *
 684  ******************************************************************************/
 685
 686 acpi_object_type
 687 acpi_ds_method_data_get_type(u16 opcode,
 688                              u32 index, struct acpi_walk_state *walk_state)
 689 {
 690         acpi_status status;
 691         struct acpi_namespace_node *node;
 692         union acpi_operand_object *object;
 693
 694         ACPI_FUNCTION_TRACE(ds_method_data_get_type);
 695
 696         /* Get the namespace node for the arg/local */
 697
 698         status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
 699         if (ACPI_FAILURE(status)) {
 700                 return_VALUE((ACPI_TYPE_NOT_FOUND));
 701         }
 702
 703         /* Get the object */
 704
 705         object = acpi_ns_get_attached_object(node);
 706         if (!object) {
 707
 708                 /* Uninitialized local/arg, return TYPE_ANY */
 709
 710                 return_VALUE(ACPI_TYPE_ANY);
 711         }
 712
 713         /* Get the object type */
 714
 715         return_VALUE(object->type);
 716 }
 717 #endif