drivers/acpi/executer/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 <acpi/acdispat.h>
  47 #include <acpi/acinterp.h>
  48 #include <acpi/amlcode.h>
  49 #include <acpi/acnamesp.h>
  50 #include <acpi/acparser.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 (ACPI_GET_OBJECT_TYPE(source_desc)) {
 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                 if (source_desc->reference.opcode == AML_INDEX_OP) {
 183                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 184                                               "[%s, 0x%X]\n",
 185                                               acpi_ps_get_opcode_name
 186                                               (source_desc->reference.opcode),
 187                                               source_desc->reference.offset));
 188                 } else {
 189                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[%s]",
 190                                               acpi_ps_get_opcode_name
 191                                               (source_desc->reference.opcode)));
 192                 }
 193
 194                 if (source_desc->reference.opcode == AML_LOAD_OP) {     /* Load and load_table */
 195                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 196                                               " Table OwnerId %p\n",
 197                                               source_desc->reference.object));
 198                         break;
 199                 }
 200
 201                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "  "));
 202
 203                 /* Check for valid node first, then valid object */
 204
 205                 if (source_desc->reference.node) {
 206                         if (ACPI_GET_DESCRIPTOR_TYPE
 207                             (source_desc->reference.node) !=
 208                             ACPI_DESC_TYPE_NAMED) {
 209                                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 210                                                       " %p - Not a valid namespace node\n",
 211                                                       source_desc->reference.
 212                                                       node));
 213                         } else {
 214                                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
 215                                                       "Node %p [%4.4s] ",
 216                                                       source_desc->reference.
 217                                                       node,
 218                                                       (source_desc->reference.
 219                                                        node)->name.ascii));
 220
 221                                 switch ((source_desc->reference.node)->type) {
 222
 223                                         /* These types have no attached object */
 224
 225                                 case ACPI_TYPE_DEVICE:
 226                                         acpi_os_printf("Device\n");
 227                                         break;
 228
 229                                 case ACPI_TYPE_THERMAL:
 230                                         acpi_os_printf("Thermal Zone\n");
 231                                         break;
 232
 233                                 default:
 234                                         acpi_ex_do_debug_object((source_desc->
 235                                                                  reference.
 236                                                                  node)->object,
 237                                                                 level + 4, 0);
 238                                         break;
 239                                 }
 240                         }
 241                 } else if (source_desc->reference.object) {
 242                         if (ACPI_GET_DESCRIPTOR_TYPE
 243                             (source_desc->reference.object) ==
 244                             ACPI_DESC_TYPE_NAMED) {
 245                                 acpi_ex_do_debug_object(((struct
 246                                                           acpi_namespace_node *)
 247                                                          source_desc->reference.
 248                                                          object)->object,
 249                                                         level + 4, 0);
 250                         } else {
 251                                 acpi_ex_do_debug_object(source_desc->reference.
 252                                                         object, level + 4, 0);
 253                         }
 254                 }
 255                 break;
 256
 257         default:
 258
 259                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%p\n",
 260                                       source_desc));
 261                 break;
 262         }
 263
 264         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "\n"));
 265         return_VOID;
 266 }
 267
 268 /*******************************************************************************
 269  *
 270  * FUNCTION:    acpi_ex_store
 271  *
 272  * PARAMETERS:  *source_desc        - Value to be stored
 273  *              *dest_desc          - Where to store it.  Must be an NS node
 274  *                                    or an union acpi_operand_object of type
 275  *                                    Reference;
 276  *              walk_state          - Current walk state
 277  *
 278  * RETURN:      Status
 279  *
 280  * DESCRIPTION: Store the value described by source_desc into the location
 281  *              described by dest_desc. Called by various interpreter
 282  *              functions to store the result of an operation into
 283  *              the destination operand -- not just simply the actual "Store"
 284  *              ASL operator.
 285  *
 286  ******************************************************************************/
 287
 288 acpi_status
 289 acpi_ex_store(union acpi_operand_object *source_desc,
 290               union acpi_operand_object *dest_desc,
 291               struct acpi_walk_state *walk_state)
 292 {
 293         acpi_status status = AE_OK;
 294         union acpi_operand_object *ref_desc = dest_desc;
 295
 296         ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
 297
 298         /* Validate parameters */
 299
 300         if (!source_desc || !dest_desc) {
 301                 ACPI_ERROR((AE_INFO, "Null parameter"));
 302                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 303         }
 304
 305         /* dest_desc can be either a namespace node or an ACPI object */
 306
 307         if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
 308                 /*
 309                  * Dest is a namespace node,
 310                  * Storing an object into a Named node.
 311                  */
 312                 status = acpi_ex_store_object_to_node(source_desc,
 313                                                       (struct
 314                                                        acpi_namespace_node *)
 315                                                       dest_desc, walk_state,
 316                                                       ACPI_IMPLICIT_CONVERSION);
 317
 318                 return_ACPI_STATUS(status);
 319         }
 320
 321         /* Destination object must be a Reference or a Constant object */
 322
 323         switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
 324         case ACPI_TYPE_LOCAL_REFERENCE:
 325                 break;
 326
 327         case ACPI_TYPE_INTEGER:
 328
 329                 /* Allow stores to Constants -- a Noop as per ACPI spec */
 330
 331                 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
 332                         return_ACPI_STATUS(AE_OK);
 333                 }
 334
 335                 /*lint -fallthrough */
 336
 337         default:
 338
 339                 /* Destination is not a Reference object */
 340
 341                 ACPI_ERROR((AE_INFO,
 342                             "Target is not a Reference or Constant object - %s [%p]",
 343                             acpi_ut_get_object_type_name(dest_desc),
 344                             dest_desc));
 345
 346                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 347         }
 348
 349         /*
 350          * Examine the Reference opcode.  These cases are handled:
 351          *
 352          * 1) Store to Name (Change the object associated with a name)
 353          * 2) Store to an indexed area of a Buffer or Package
 354          * 3) Store to a Method Local or Arg
 355          * 4) Store to the debug object
 356          */
 357         switch (ref_desc->reference.opcode) {
 358         case AML_REF_OF_OP:
 359
 360                 /* Storing an object into a Name "container" */
 361
 362                 status = acpi_ex_store_object_to_node(source_desc,
 363                                                       ref_desc->reference.
 364                                                       object, walk_state,
 365                                                       ACPI_IMPLICIT_CONVERSION);
 366                 break;
 367
 368         case AML_INDEX_OP:
 369
 370                 /* Storing to an Index (pointer into a packager or buffer) */
 371
 372                 status =
 373                     acpi_ex_store_object_to_index(source_desc, ref_desc,
 374                                                   walk_state);
 375                 break;
 376
 377         case AML_LOCAL_OP:
 378         case AML_ARG_OP:
 379
 380                 /* Store to a method local/arg  */
 381
 382                 status =
 383                     acpi_ds_store_object_to_local(ref_desc->reference.opcode,
 384                                                   ref_desc->reference.offset,
 385                                                   source_desc, walk_state);
 386                 break;
 387
 388         case AML_DEBUG_OP:
 389
 390                 /*
 391                  * Storing to the Debug object causes the value stored to be
 392                  * displayed and otherwise has no effect -- see ACPI Specification
 393                  */
 394                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 395                                   "**** Write to Debug Object: Object %p %s ****:\n\n",
 396                                   source_desc,
 397                                   acpi_ut_get_object_type_name(source_desc)));
 398
 399                 acpi_ex_do_debug_object(source_desc, 0, 0);
 400                 break;
 401
 402         default:
 403
 404                 ACPI_ERROR((AE_INFO, "Unknown Reference opcode %X",
 405                             ref_desc->reference.opcode));
 406                 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_ERROR);
 407
 408                 status = AE_AML_INTERNAL;
 409                 break;
 410         }
 411
 412         return_ACPI_STATUS(status);
 413 }
 414
 415 /*******************************************************************************
 416  *
 417  * FUNCTION:    acpi_ex_store_object_to_index
 418  *
 419  * PARAMETERS:  *source_desc            - Value to be stored
 420  *              *dest_desc              - Named object to receive the value
 421  *              walk_state              - Current walk state
 422  *
 423  * RETURN:      Status
 424  *
 425  * DESCRIPTION: Store the object to indexed Buffer or Package element
 426  *
 427  ******************************************************************************/
 428
 429 static acpi_status
 430 acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
 431                               union acpi_operand_object *index_desc,
 432                               struct acpi_walk_state *walk_state)
 433 {
 434         acpi_status status = AE_OK;
 435         union acpi_operand_object *obj_desc;
 436         union acpi_operand_object *new_desc;
 437         u8 value = 0;
 438         u32 i;
 439
 440         ACPI_FUNCTION_TRACE(ex_store_object_to_index);
 441
 442         /*
 443          * Destination must be a reference pointer, and
 444          * must point to either a buffer or a package
 445          */
 446         switch (index_desc->reference.target_type) {
 447         case ACPI_TYPE_PACKAGE:
 448                 /*
 449                  * Storing to a package element. Copy the object and replace
 450                  * any existing object with the new object. No implicit
 451                  * conversion is performed.
 452                  *
 453                  * The object at *(index_desc->Reference.Where) is the
 454                  * element within the package that is to be modified.
 455                  * The parent package object is at index_desc->Reference.Object
 456                  */
 457                 obj_desc = *(index_desc->reference.where);
 458
 459                 if (ACPI_GET_OBJECT_TYPE(source_desc) ==
 460                     ACPI_TYPE_LOCAL_REFERENCE
 461                     && source_desc->reference.opcode == AML_LOAD_OP) {
 462
 463                         /* This is a DDBHandle, just add a reference to it */
 464
 465                         acpi_ut_add_reference(source_desc);
 466                         new_desc = source_desc;
 467                 } else {
 468                         /* Normal object, copy it */
 469
 470                         status =
 471                             acpi_ut_copy_iobject_to_iobject(source_desc,
 472                                                             &new_desc,
 473                                                             walk_state);
 474                         if (ACPI_FAILURE(status)) {
 475                                 return_ACPI_STATUS(status);
 476                         }
 477                 }
 478
 479                 if (obj_desc) {
 480
 481                         /* Decrement reference count by the ref count of the parent package */
 482
 483                         for (i = 0; i < ((union acpi_operand_object *)
 484                                          index_desc->reference.object)->common.
 485                              reference_count; i++) {
 486                                 acpi_ut_remove_reference(obj_desc);
 487                         }
 488                 }
 489
 490                 *(index_desc->reference.where) = new_desc;
 491
 492                 /* Increment ref count by the ref count of the parent package-1 */
 493
 494                 for (i = 1; i < ((union acpi_operand_object *)
 495                                  index_desc->reference.object)->common.
 496                      reference_count; i++) {
 497                         acpi_ut_add_reference(new_desc);
 498                 }
 499
 500                 break;
 501
 502         case ACPI_TYPE_BUFFER_FIELD:
 503
 504                 /*
 505                  * Store into a Buffer or String (not actually a real buffer_field)
 506                  * at a location defined by an Index.
 507                  *
 508                  * The first 8-bit element of the source object is written to the
 509                  * 8-bit Buffer location defined by the Index destination object,
 510                  * according to the ACPI 2.0 specification.
 511                  */
 512
 513                 /*
 514                  * Make sure the target is a Buffer or String. An error should
 515                  * not happen here, since the reference_object was constructed
 516                  * by the INDEX_OP code.
 517                  */
 518                 obj_desc = index_desc->reference.object;
 519                 if ((ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_BUFFER) &&
 520                     (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_STRING)) {
 521                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 522                 }
 523
 524                 /*
 525                  * The assignment of the individual elements will be slightly
 526                  * different for each source type.
 527                  */
 528                 switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
 529                 case ACPI_TYPE_INTEGER:
 530
 531                         /* Use the least-significant byte of the integer */
 532
 533                         value = (u8) (source_desc->integer.value);
 534                         break;
 535
 536                 case ACPI_TYPE_BUFFER:
 537                 case ACPI_TYPE_STRING:
 538
 539                         /* Note: Takes advantage of common string/buffer fields */
 540
 541                         value = source_desc->buffer.pointer[0];
 542                         break;
 543
 544                 default:
 545
 546                         /* All other types are invalid */
 547
 548                         ACPI_ERROR((AE_INFO,
 549                                     "Source must be Integer/Buffer/String type, not %s",
 550                                     acpi_ut_get_object_type_name(source_desc)));
 551                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 552                 }
 553
 554                 /* Store the source value into the target buffer byte */
 555
 556                 obj_desc->buffer.pointer[index_desc->reference.offset] = value;
 557                 break;
 558
 559         default:
 560                 ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
 561                 status = AE_AML_OPERAND_TYPE;
 562                 break;
 563         }
 564
 565         return_ACPI_STATUS(status);
 566 }
 567
 568 /*******************************************************************************
 569  *
 570  * FUNCTION:    acpi_ex_store_object_to_node
 571  *
 572  * PARAMETERS:  source_desc             - Value to be stored
 573  *              Node                    - Named object to receive the value
 574  *              walk_state              - Current walk state
 575  *              implicit_conversion     - Perform implicit conversion (yes/no)
 576  *
 577  * RETURN:      Status
 578  *
 579  * DESCRIPTION: Store the object to the named object.
 580  *
 581  *              The Assignment of an object to a named object is handled here
 582  *              The value passed in will replace the current value (if any)
 583  *              with the input value.
 584  *
 585  *              When storing into an object the data is converted to the
 586  *              target object type then stored in the object.  This means
 587  *              that the target object type (for an initialized target) will
 588  *              not be changed by a store operation.
 589  *
 590  *              Assumes parameters are already validated.
 591  *
 592  ******************************************************************************/
 593
 594 acpi_status
 595 acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
 596                              struct acpi_namespace_node *node,
 597                              struct acpi_walk_state *walk_state,
 598                              u8 implicit_conversion)
 599 {
 600         acpi_status status = AE_OK;
 601         union acpi_operand_object *target_desc;
 602         union acpi_operand_object *new_desc;
 603         acpi_object_type target_type;
 604
 605         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
 606
 607         /* Get current type of the node, and object attached to Node */
 608
 609         target_type = acpi_ns_get_type(node);
 610         target_desc = acpi_ns_get_attached_object(node);
 611
 612         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
 613                           source_desc,
 614                           acpi_ut_get_object_type_name(source_desc), node,
 615                           acpi_ut_get_type_name(target_type)));
 616
 617         /*
 618          * Resolve the source object to an actual value
 619          * (If it is a reference object)
 620          */
 621         status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
 622         if (ACPI_FAILURE(status)) {
 623                 return_ACPI_STATUS(status);
 624         }
 625
 626         /* If no implicit conversion, drop into the default case below */
 627
 628         if ((!implicit_conversion) ||
 629             ((walk_state->opcode == AML_COPY_OP) &&
 630              (target_type != ACPI_TYPE_LOCAL_REGION_FIELD) &&
 631              (target_type != ACPI_TYPE_LOCAL_BANK_FIELD) &&
 632              (target_type != ACPI_TYPE_LOCAL_INDEX_FIELD))) {
 633                 /*
 634                  * Force execution of default (no implicit conversion). Note:
 635                  * copy_object does not perform an implicit conversion, as per the ACPI
 636                  * spec -- except in case of region/bank/index fields -- because these
 637                  * objects must retain their original type permanently.
 638                  */
 639                 target_type = ACPI_TYPE_ANY;
 640         }
 641
 642         /* Do the actual store operation */
 643
 644         switch (target_type) {
 645         case ACPI_TYPE_BUFFER_FIELD:
 646         case ACPI_TYPE_LOCAL_REGION_FIELD:
 647         case ACPI_TYPE_LOCAL_BANK_FIELD:
 648         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 649
 650                 /* For fields, copy the source data to the target field. */
 651
 652                 status = acpi_ex_write_data_to_field(source_desc, target_desc,
 653                                                      &walk_state->result_obj);
 654                 break;
 655
 656         case ACPI_TYPE_INTEGER:
 657         case ACPI_TYPE_STRING:
 658         case ACPI_TYPE_BUFFER:
 659
 660                 /*
 661                  * These target types are all of type Integer/String/Buffer, and
 662                  * therefore support implicit conversion before the store.
 663                  *
 664                  * Copy and/or convert the source object to a new target object
 665                  */
 666                 status =
 667                     acpi_ex_store_object_to_object(source_desc, target_desc,
 668                                                    &new_desc, walk_state);
 669                 if (ACPI_FAILURE(status)) {
 670                         return_ACPI_STATUS(status);
 671                 }
 672
 673                 if (new_desc != target_desc) {
 674                         /*
 675                          * Store the new new_desc as the new value of the Name, and set
 676                          * the Name's type to that of the value being stored in it.
 677                          * source_desc reference count is incremented by attach_object.
 678                          *
 679                          * Note: This may change the type of the node if an explicit store
 680                          * has been performed such that the node/object type has been
 681                          * changed.
 682                          */
 683                         status =
 684                             acpi_ns_attach_object(node, new_desc,
 685                                                   new_desc->common.type);
 686
 687                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 688                                           "Store %s into %s via Convert/Attach\n",
 689                                           acpi_ut_get_object_type_name
 690                                           (source_desc),
 691                                           acpi_ut_get_object_type_name
 692                                           (new_desc)));
 693                 }
 694                 break;
 695
 696         default:
 697
 698                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 699                                   "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
 700                                   acpi_ut_get_object_type_name(source_desc),
 701                                   source_desc, node));
 702
 703                 /* No conversions for all other types.  Just attach the source object */
 704
 705                 status = acpi_ns_attach_object(node, source_desc,
 706                                                ACPI_GET_OBJECT_TYPE
 707                                                (source_desc));
 708                 break;
 709         }
 710
 711         return_ACPI_STATUS(status);
 712 }