drivers/acpi/acpica/exstore.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exstore - AML Interpreter object store support
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2008, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acdispat.h"
  48 #include "acinterp.h"
  49 #include "amlcode.h"
  50 #include "acnamesp.h"
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53 ACPI_MODULE_NAME("exstore")
  54
  55 /* Local prototypes */
  56 static void
  57 acpi_ex_do_debug_object(union acpi_operand_object *source_desc,
  58                         u32 level, u32 index);
  59
  60 static acpi_status
  61 acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
  62                               union acpi_operand_object *dest_desc,
  63                               struct acpi_walk_state *walk_state);
  64
  65 /*******************************************************************************
  66  *
  67  * FUNCTION:    acpi_ex_do_debug_object
  68  *
  69  * PARAMETERS:  source_desc         - Value to be stored
  70  *              Level               - Indentation level (used for packages)
  71  *              Index               - Current package element, zero if not pkg
  72  *
  73  * RETURN:      None
  74  *
  75  * DESCRIPTION: Handles stores to the Debug Object.
  76  *
  77  ******************************************************************************/
  78
  79 static void
  80 acpi_ex_do_debug_object(union acpi_operand_object *source_desc,
  81                         u32 level, u32 index)
  82 {
  83         u32 i;
  84
  85         ACPI_FUNCTION_TRACE_PTR(ex_do_debug_object, source_desc);
  86
  87         /* Print line header as long as we are not in the middle of an object display */
  88
  89         if (!((level > 0) && index == 0)) {
  90                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[ACPI Debug] %*s",
  91                                       level, " "));
  92         }
  93
  94         /* Display index for package output only */
  95
  96         if (index > 0) {
  97                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
  98                                       "(%.2u) ", index - 1));
  99         }
 100
 101         if (!source_desc) {
 102                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[Null Object]\n"));
 103                 return_VOID;
 104         }
 105
 106         if (ACPI_GET_DESCRIPTOR_TYPE(source_desc) == ACPI_DESC_TYPE_OPERAND) {
 107                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%s ",
 108                                       acpi_ut_get_object_type_name
 109                                       (source_desc)));
 110
 111                 if (!acpi_ut_valid_internal_object(source_desc)) {
 112                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 113                                               "%p, Invalid Internal Object!\n",
 114                                               source_desc));
 115                         return_VOID;
 116                 }
 117         } else if (ACPI_GET_DESCRIPTOR_TYPE(source_desc) ==
 118                    ACPI_DESC_TYPE_NAMED) {
 119                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%s: %p\n",
 120                                       acpi_ut_get_type_name(((struct
 121                                                               acpi_namespace_node
 122                                                               *)source_desc)->
 123                                                             type),
 124                                       source_desc));
 125                 return_VOID;
 126         } else {
 127                 return_VOID;
 128         }
 129
 130         /* source_desc is of type ACPI_DESC_TYPE_OPERAND */
 131
 132         switch (source_desc->common.type) {
 133         case ACPI_TYPE_INTEGER:
 134
 135                 /* Output correct integer width */
 136
 137                 if (acpi_gbl_integer_byte_width == 4) {
 138                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "0x%8.8X\n",
 139                                               (u32) source_desc->integer.
 140                                               value));
 141                 } else {
 142                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 143                                               "0x%8.8X%8.8X\n",
 144                                               ACPI_FORMAT_UINT64(source_desc->
 145                                                                  integer.
 146                                                                  value)));
 147                 }
 148                 break;
 149
 150         case ACPI_TYPE_BUFFER:
 151
 152                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[0x%.2X]\n",
 153                                       (u32) source_desc->buffer.length));
 154                 ACPI_DUMP_BUFFER(source_desc->buffer.pointer,
 155                                  (source_desc->buffer.length <
 156                                   256) ? source_desc->buffer.length : 256);
 157                 break;
 158
 159         case ACPI_TYPE_STRING:
 160
 161                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[0x%.2X] \"%s\"\n",
 162                                       source_desc->string.length,
 163                                       source_desc->string.pointer));
 164                 break;
 165
 166         case ACPI_TYPE_PACKAGE:
 167
 168                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 169                                       "[Contains 0x%.2X Elements]\n",
 170                                       source_desc->package.count));
 171
 172                 /* Output the entire contents of the package */
 173
 174                 for (i = 0; i < source_desc->package.count; i++) {
 175                         acpi_ex_do_debug_object(source_desc->package.
 176                                                 elements[i], level + 4, i + 1);
 177                 }
 178                 break;
 179
 180         case ACPI_TYPE_LOCAL_REFERENCE:
 181
 182                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[%s] ",
 183                                       acpi_ut_get_reference_name(source_desc)));
 184
 185                 /* Decode the reference */
 186
 187                 switch (source_desc->reference.class) {
 188                 case ACPI_REFCLASS_INDEX:
 189
 190                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "0x%X\n",
 191                                               source_desc->reference.value));
 192                         break;
 193
 194                 case ACPI_REFCLASS_TABLE:
 195
 196                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 197                                               "Table Index 0x%X\n",
 198                                               source_desc->reference.value));
 199                         break;
 200
 201                 default:
 202                         break;
 203                 }
 204
 205                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "  "));
 206
 207                 /* Check for valid node first, then valid object */
 208
 209                 if (source_desc->reference.node) {
 210                         if (ACPI_GET_DESCRIPTOR_TYPE
 211                             (source_desc->reference.node) !=
 212                             ACPI_DESC_TYPE_NAMED) {
 213                                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 214                                                       " %p - Not a valid namespace node\n",
 215                                                       source_desc->reference.
 216                                                       node));
 217                         } else {
 218                                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 219                                                       "Node %p [%4.4s] ",
 220                                                       source_desc->reference.
 221                                                       node,
 222                                                       (source_desc->reference.
 223                                                        node)->name.ascii));
 224
 225                                 switch ((source_desc->reference.node)->type) {
 226
 227                                         /* These types have no attached object */
 228
 229                                 case ACPI_TYPE_DEVICE:
 230                                         acpi_os_printf("Device\n");
 231                                         break;
 232
 233                                 case ACPI_TYPE_THERMAL:
 234                                         acpi_os_printf("Thermal Zone\n");
 235                                         break;
 236
 237                                 default:
 238                                         acpi_ex_do_debug_object((source_desc->
 239                                                                  reference.
 240                                                                  node)->object,
 241                                                                 level + 4, 0);
 242                                         break;
 243                                 }
 244                         }
 245                 } else if (source_desc->reference.object) {
 246                         if (ACPI_GET_DESCRIPTOR_TYPE
 247                             (source_desc->reference.object) ==
 248                             ACPI_DESC_TYPE_NAMED) {
 249                                 acpi_ex_do_debug_object(((struct
 250                                                           acpi_namespace_node *)
 251                                                          source_desc->reference.
 252                                                          object)->object,
 253                                                         level + 4, 0);
 254                         } else {
 255                                 acpi_ex_do_debug_object(source_desc->reference.
 256                                                         object, level + 4, 0);
 257                         }
 258                 }
 259                 break;
 260
 261         default:
 262
 263                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%p\n",
 264                                       source_desc));
 265                 break;
 266         }
 267
 268         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "\n"));
 269         return_VOID;
 270 }
 271
 272 /*******************************************************************************
 273  *
 274  * FUNCTION:    acpi_ex_store
 275  *
 276  * PARAMETERS:  *source_desc        - Value to be stored
 277  *              *dest_desc          - Where to store it.  Must be an NS node
 278  *                                    or a union acpi_operand_object of type
 279  *                                    Reference;
 280  *              walk_state          - Current walk state
 281  *
 282  * RETURN:      Status
 283  *
 284  * DESCRIPTION: Store the value described by source_desc into the location
 285  *              described by dest_desc. Called by various interpreter
 286  *              functions to store the result of an operation into
 287  *              the destination operand -- not just simply the actual "Store"
 288  *              ASL operator.
 289  *
 290  ******************************************************************************/
 291
 292 acpi_status
 293 acpi_ex_store(union acpi_operand_object *source_desc,
 294               union acpi_operand_object *dest_desc,
 295               struct acpi_walk_state *walk_state)
 296 {
 297         acpi_status status = AE_OK;
 298         union acpi_operand_object *ref_desc = dest_desc;
 299
 300         ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
 301
 302         /* Validate parameters */
 303
 304         if (!source_desc || !dest_desc) {
 305                 ACPI_ERROR((AE_INFO, "Null parameter"));
 306                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 307         }
 308
 309         /* dest_desc can be either a namespace node or an ACPI object */
 310
 311         if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
 312                 /*
 313                  * Dest is a namespace node,
 314                  * Storing an object into a Named node.
 315                  */
 316                 status = acpi_ex_store_object_to_node(source_desc,
 317                                                       (struct
 318                                                        acpi_namespace_node *)
 319                                                       dest_desc, walk_state,
 320                                                       ACPI_IMPLICIT_CONVERSION);
 321
 322                 return_ACPI_STATUS(status);
 323         }
 324
 325         /* Destination object must be a Reference or a Constant object */
 326
 327         switch (dest_desc->common.type) {
 328         case ACPI_TYPE_LOCAL_REFERENCE:
 329                 break;
 330
 331         case ACPI_TYPE_INTEGER:
 332
 333                 /* Allow stores to Constants -- a Noop as per ACPI spec */
 334
 335                 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
 336                         return_ACPI_STATUS(AE_OK);
 337                 }
 338
 339                 /*lint -fallthrough */
 340
 341         default:
 342
 343                 /* Destination is not a Reference object */
 344
 345                 ACPI_ERROR((AE_INFO,
 346                             "Target is not a Reference or Constant object - %s [%p]",
 347                             acpi_ut_get_object_type_name(dest_desc),
 348                             dest_desc));
 349
 350                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 351         }
 352
 353         /*
 354          * Examine the Reference class. These cases are handled:
 355          *
 356          * 1) Store to Name (Change the object associated with a name)
 357          * 2) Store to an indexed area of a Buffer or Package
 358          * 3) Store to a Method Local or Arg
 359          * 4) Store to the debug object
 360          */
 361         switch (ref_desc->reference.class) {
 362         case ACPI_REFCLASS_REFOF:
 363
 364                 /* Storing an object into a Name "container" */
 365
 366                 status = acpi_ex_store_object_to_node(source_desc,
 367                                                       ref_desc->reference.
 368                                                       object, walk_state,
 369                                                       ACPI_IMPLICIT_CONVERSION);
 370                 break;
 371
 372         case ACPI_REFCLASS_INDEX:
 373
 374                 /* Storing to an Index (pointer into a packager or buffer) */
 375
 376                 status =
 377                     acpi_ex_store_object_to_index(source_desc, ref_desc,
 378                                                   walk_state);
 379                 break;
 380
 381         case ACPI_REFCLASS_LOCAL:
 382         case ACPI_REFCLASS_ARG:
 383
 384                 /* Store to a method local/arg  */
 385
 386                 status =
 387                     acpi_ds_store_object_to_local(ref_desc->reference.class,
 388                                                   ref_desc->reference.value,
 389                                                   source_desc, walk_state);
 390                 break;
 391
 392         case ACPI_REFCLASS_DEBUG:
 393
 394                 /*
 395                  * Storing to the Debug object causes the value stored to be
 396                  * displayed and otherwise has no effect -- see ACPI Specification
 397                  */
 398                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 399                                   "**** Write to Debug Object: Object %p %s ****:\n\n",
 400                                   source_desc,
 401                                   acpi_ut_get_object_type_name(source_desc)));
 402
 403                 acpi_ex_do_debug_object(source_desc, 0, 0);
 404                 break;
 405
 406         default:
 407
 408                 ACPI_ERROR((AE_INFO, "Unknown Reference Class %2.2X",
 409                             ref_desc->reference.class));
 410                 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
 411
 412                 status = AE_AML_INTERNAL;
 413                 break;
 414         }
 415
 416         return_ACPI_STATUS(status);
 417 }
 418
 419 /*******************************************************************************
 420  *
 421  * FUNCTION:    acpi_ex_store_object_to_index
 422  *
 423  * PARAMETERS:  *source_desc            - Value to be stored
 424  *              *dest_desc              - Named object to receive the value
 425  *              walk_state              - Current walk state
 426  *
 427  * RETURN:      Status
 428  *
 429  * DESCRIPTION: Store the object to indexed Buffer or Package element
 430  *
 431  ******************************************************************************/
 432
 433 static acpi_status
 434 acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
 435                               union acpi_operand_object *index_desc,
 436                               struct acpi_walk_state *walk_state)
 437 {
 438         acpi_status status = AE_OK;
 439         union acpi_operand_object *obj_desc;
 440         union acpi_operand_object *new_desc;
 441         u8 value = 0;
 442         u32 i;
 443
 444         ACPI_FUNCTION_TRACE(ex_store_object_to_index);
 445
 446         /*
 447          * Destination must be a reference pointer, and
 448          * must point to either a buffer or a package
 449          */
 450         switch (index_desc->reference.target_type) {
 451         case ACPI_TYPE_PACKAGE:
 452                 /*
 453                  * Storing to a package element. Copy the object and replace
 454                  * any existing object with the new object. No implicit
 455                  * conversion is performed.
 456                  *
 457                  * The object at *(index_desc->Reference.Where) is the
 458                  * element within the package that is to be modified.
 459                  * The parent package object is at index_desc->Reference.Object
 460                  */
 461                 obj_desc = *(index_desc->reference.where);
 462
 463                 if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
 464                     source_desc->reference.class == ACPI_REFCLASS_TABLE) {
 465
 466                         /* This is a DDBHandle, just add a reference to it */
 467
 468                         acpi_ut_add_reference(source_desc);
 469                         new_desc = source_desc;
 470                 } else {
 471                         /* Normal object, copy it */
 472
 473                         status =
 474                             acpi_ut_copy_iobject_to_iobject(source_desc,
 475                                                             &new_desc,
 476                                                             walk_state);
 477                         if (ACPI_FAILURE(status)) {
 478                                 return_ACPI_STATUS(status);
 479                         }
 480                 }
 481
 482                 if (obj_desc) {
 483
 484                         /* Decrement reference count by the ref count of the parent package */
 485
 486                         for (i = 0; i < ((union acpi_operand_object *)
 487                                          index_desc->reference.object)->common.
 488                              reference_count; i++) {
 489                                 acpi_ut_remove_reference(obj_desc);
 490                         }
 491                 }
 492
 493                 *(index_desc->reference.where) = new_desc;
 494
 495                 /* Increment ref count by the ref count of the parent package-1 */
 496
 497                 for (i = 1; i < ((union acpi_operand_object *)
 498                                  index_desc->reference.object)->common.
 499                      reference_count; i++) {
 500                         acpi_ut_add_reference(new_desc);
 501                 }
 502
 503                 break;
 504
 505         case ACPI_TYPE_BUFFER_FIELD:
 506
 507                 /*
 508                  * Store into a Buffer or String (not actually a real buffer_field)
 509                  * at a location defined by an Index.
 510                  *
 511                  * The first 8-bit element of the source object is written to the
 512                  * 8-bit Buffer location defined by the Index destination object,
 513                  * according to the ACPI 2.0 specification.
 514                  */
 515
 516                 /*
 517                  * Make sure the target is a Buffer or String. An error should
 518                  * not happen here, since the reference_object was constructed
 519                  * by the INDEX_OP code.
 520                  */
 521                 obj_desc = index_desc->reference.object;
 522                 if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
 523                     (obj_desc->common.type != ACPI_TYPE_STRING)) {
 524                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 525                 }
 526
 527                 /*
 528                  * The assignment of the individual elements will be slightly
 529                  * different for each source type.
 530                  */
 531                 switch (source_desc->common.type) {
 532                 case ACPI_TYPE_INTEGER:
 533
 534                         /* Use the least-significant byte of the integer */
 535
 536                         value = (u8) (source_desc->integer.value);
 537                         break;
 538
 539                 case ACPI_TYPE_BUFFER:
 540                 case ACPI_TYPE_STRING:
 541
 542                         /* Note: Takes advantage of common string/buffer fields */
 543
 544                         value = source_desc->buffer.pointer[0];
 545                         break;
 546
 547                 default:
 548
 549                         /* All other types are invalid */
 550
 551                         ACPI_ERROR((AE_INFO,
 552                                     "Source must be Integer/Buffer/String type, not %s",
 553                                     acpi_ut_get_object_type_name(source_desc)));
 554                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 555                 }
 556
 557                 /* Store the source value into the target buffer byte */
 558
 559                 obj_desc->buffer.pointer[index_desc->reference.value] = value;
 560                 break;
 561
 562         default:
 563                 ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
 564                 status = AE_AML_OPERAND_TYPE;
 565                 break;
 566         }
 567
 568         return_ACPI_STATUS(status);
 569 }
 570
 571 /*******************************************************************************
 572  *
 573  * FUNCTION:    acpi_ex_store_object_to_node
 574  *
 575  * PARAMETERS:  source_desc             - Value to be stored
 576  *              Node                    - Named object to receive the value
 577  *              walk_state              - Current walk state
 578  *              implicit_conversion     - Perform implicit conversion (yes/no)
 579  *
 580  * RETURN:      Status
 581  *
 582  * DESCRIPTION: Store the object to the named object.
 583  *
 584  *              The Assignment of an object to a named object is handled here
 585  *              The value passed in will replace the current value (if any)
 586  *              with the input value.
 587  *
 588  *              When storing into an object the data is converted to the
 589  *              target object type then stored in the object.  This means
 590  *              that the target object type (for an initialized target) will
 591  *              not be changed by a store operation.
 592  *
 593  *              Assumes parameters are already validated.
 594  *
 595  ******************************************************************************/
 596
 597 acpi_status
 598 acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
 599                              struct acpi_namespace_node *node,
 600                              struct acpi_walk_state *walk_state,
 601                              u8 implicit_conversion)
 602 {
 603         acpi_status status = AE_OK;
 604         union acpi_operand_object *target_desc;
 605         union acpi_operand_object *new_desc;
 606         acpi_object_type target_type;
 607
 608         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
 609
 610         /* Get current type of the node, and object attached to Node */
 611
 612         target_type = acpi_ns_get_type(node);
 613         target_desc = acpi_ns_get_attached_object(node);
 614
 615         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
 616                           source_desc,
 617                           acpi_ut_get_object_type_name(source_desc), node,
 618                           acpi_ut_get_type_name(target_type)));
 619
 620         /*
 621          * Resolve the source object to an actual value
 622          * (If it is a reference object)
 623          */
 624         status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
 625         if (ACPI_FAILURE(status)) {
 626                 return_ACPI_STATUS(status);
 627         }
 628
 629         /* If no implicit conversion, drop into the default case below */
 630
 631         if ((!implicit_conversion) ||
 632             ((walk_state->opcode == AML_COPY_OP) &&
 633              (target_type != ACPI_TYPE_LOCAL_REGION_FIELD) &&
 634              (target_type != ACPI_TYPE_LOCAL_BANK_FIELD) &&
 635              (target_type != ACPI_TYPE_LOCAL_INDEX_FIELD))) {
 636                 /*
 637                  * Force execution of default (no implicit conversion). Note:
 638                  * copy_object does not perform an implicit conversion, as per the ACPI
 639                  * spec -- except in case of region/bank/index fields -- because these
 640                  * objects must retain their original type permanently.
 641                  */
 642                 target_type = ACPI_TYPE_ANY;
 643         }
 644
 645         /* Do the actual store operation */
 646
 647         switch (target_type) {
 648         case ACPI_TYPE_BUFFER_FIELD:
 649         case ACPI_TYPE_LOCAL_REGION_FIELD:
 650         case ACPI_TYPE_LOCAL_BANK_FIELD:
 651         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 652
 653                 /* For fields, copy the source data to the target field. */
 654
 655                 status = acpi_ex_write_data_to_field(source_desc, target_desc,
 656                                                      &walk_state->result_obj);
 657                 break;
 658
 659         case ACPI_TYPE_INTEGER:
 660         case ACPI_TYPE_STRING:
 661         case ACPI_TYPE_BUFFER:
 662
 663                 /*
 664                  * These target types are all of type Integer/String/Buffer, and
 665                  * therefore support implicit conversion before the store.
 666                  *
 667                  * Copy and/or convert the source object to a new target object
 668                  */
 669                 status =
 670                     acpi_ex_store_object_to_object(source_desc, target_desc,
 671                                                    &new_desc, walk_state);
 672                 if (ACPI_FAILURE(status)) {
 673                         return_ACPI_STATUS(status);
 674                 }
 675
 676                 if (new_desc != target_desc) {
 677                         /*
 678                          * Store the new new_desc as the new value of the Name, and set
 679                          * the Name's type to that of the value being stored in it.
 680                          * source_desc reference count is incremented by attach_object.
 681                          *
 682                          * Note: This may change the type of the node if an explicit store
 683                          * has been performed such that the node/object type has been
 684                          * changed.
 685                          */
 686                         status =
 687                             acpi_ns_attach_object(node, new_desc,
 688                                                   new_desc->common.type);
 689
 690                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 691                                           "Store %s into %s via Convert/Attach\n",
 692                                           acpi_ut_get_object_type_name
 693                                           (source_desc),
 694                                           acpi_ut_get_object_type_name
 695                                           (new_desc)));
 696                 }
 697                 break;
 698
 699         default:
 700
 701                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 702                                   "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
 703                                   acpi_ut_get_object_type_name(source_desc),
 704                                   source_desc, node));
 705
 706                 /* No conversions for all other types.  Just attach the source object */
 707
 708                 status = acpi_ns_attach_object(node, source_desc,
 709                                                source_desc->common.type);
 710                 break;
 711         }
 712
 713         return_ACPI_STATUS(status);
 714 }