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                 ACPI_DUMP_STACK_ENTRY(source_desc);
 347                 ACPI_DUMP_STACK_ENTRY(dest_desc);
 348                 ACPI_DUMP_OPERANDS(&dest_desc, ACPI_IMODE_EXECUTE, "ExStore",
 349                                    2,
 350                                    "Target is not a Reference or Constant object");
 351
 352                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 353         }
 354
 355         /*
 356          * Examine the Reference opcode.  These cases are handled:
 357          *
 358          * 1) Store to Name (Change the object associated with a name)
 359          * 2) Store to an indexed area of a Buffer or Package
 360          * 3) Store to a Method Local or Arg
 361          * 4) Store to the debug object
 362          */
 363         switch (ref_desc->reference.opcode) {
 364         case AML_REF_OF_OP:
 365
 366                 /* Storing an object into a Name "container" */
 367
 368                 status = acpi_ex_store_object_to_node(source_desc,
 369                                                       ref_desc->reference.
 370                                                       object, walk_state,
 371                                                       ACPI_IMPLICIT_CONVERSION);
 372                 break;
 373
 374         case AML_INDEX_OP:
 375
 376                 /* Storing to an Index (pointer into a packager or buffer) */
 377
 378                 status =
 379                     acpi_ex_store_object_to_index(source_desc, ref_desc,
 380                                                   walk_state);
 381                 break;
 382
 383         case AML_LOCAL_OP:
 384         case AML_ARG_OP:
 385
 386                 /* Store to a method local/arg  */
 387
 388                 status =
 389                     acpi_ds_store_object_to_local(ref_desc->reference.opcode,
 390                                                   ref_desc->reference.offset,
 391                                                   source_desc, walk_state);
 392                 break;
 393
 394         case AML_DEBUG_OP:
 395
 396                 /*
 397                  * Storing to the Debug object causes the value stored to be
 398                  * displayed and otherwise has no effect -- see ACPI Specification
 399                  */
 400                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 401                                   "**** Write to Debug Object: Object %p %s ****:\n\n",
 402                                   source_desc,
 403                                   acpi_ut_get_object_type_name(source_desc)));
 404
 405                 acpi_ex_do_debug_object(source_desc, 0, 0);
 406                 break;
 407
 408         default:
 409
 410                 ACPI_ERROR((AE_INFO, "Unknown Reference opcode %X",
 411                             ref_desc->reference.opcode));
 412                 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_ERROR);
 413
 414                 status = AE_AML_INTERNAL;
 415                 break;
 416         }
 417
 418         return_ACPI_STATUS(status);
 419 }
 420
 421 /*******************************************************************************
 422  *
 423  * FUNCTION:    acpi_ex_store_object_to_index
 424  *
 425  * PARAMETERS:  *source_desc            - Value to be stored
 426  *              *dest_desc              - Named object to receive the value
 427  *              walk_state              - Current walk state
 428  *
 429  * RETURN:      Status
 430  *
 431  * DESCRIPTION: Store the object to indexed Buffer or Package element
 432  *
 433  ******************************************************************************/
 434
 435 static acpi_status
 436 acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
 437                               union acpi_operand_object *index_desc,
 438                               struct acpi_walk_state *walk_state)
 439 {
 440         acpi_status status = AE_OK;
 441         union acpi_operand_object *obj_desc;
 442         union acpi_operand_object *new_desc;
 443         u8 value = 0;
 444         u32 i;
 445
 446         ACPI_FUNCTION_TRACE(ex_store_object_to_index);
 447
 448         /*
 449          * Destination must be a reference pointer, and
 450          * must point to either a buffer or a package
 451          */
 452         switch (index_desc->reference.target_type) {
 453         case ACPI_TYPE_PACKAGE:
 454                 /*
 455                  * Storing to a package element. Copy the object and replace
 456                  * any existing object with the new object. No implicit
 457                  * conversion is performed.
 458                  *
 459                  * The object at *(index_desc->Reference.Where) is the
 460                  * element within the package that is to be modified.
 461                  * The parent package object is at index_desc->Reference.Object
 462                  */
 463                 obj_desc = *(index_desc->reference.where);
 464
 465                 if (ACPI_GET_OBJECT_TYPE(source_desc) ==
 466                     ACPI_TYPE_LOCAL_REFERENCE
 467                     && source_desc->reference.opcode == AML_LOAD_OP) {
 468
 469                         /* This is a DDBHandle, just add a reference to it */
 470
 471                         acpi_ut_add_reference(source_desc);
 472                         new_desc = source_desc;
 473                 } else {
 474                         /* Normal object, copy it */
 475
 476                         status =
 477                             acpi_ut_copy_iobject_to_iobject(source_desc,
 478                                                             &new_desc,
 479                                                             walk_state);
 480                         if (ACPI_FAILURE(status)) {
 481                                 return_ACPI_STATUS(status);
 482                         }
 483                 }
 484
 485                 if (obj_desc) {
 486
 487                         /* Decrement reference count by the ref count of the parent package */
 488
 489                         for (i = 0; i < ((union acpi_operand_object *)
 490                                          index_desc->reference.object)->common.
 491                              reference_count; i++) {
 492                                 acpi_ut_remove_reference(obj_desc);
 493                         }
 494                 }
 495
 496                 *(index_desc->reference.where) = new_desc;
 497
 498                 /* Increment ref count by the ref count of the parent package-1 */
 499
 500                 for (i = 1; i < ((union acpi_operand_object *)
 501                                  index_desc->reference.object)->common.
 502                      reference_count; i++) {
 503                         acpi_ut_add_reference(new_desc);
 504                 }
 505
 506                 break;
 507
 508         case ACPI_TYPE_BUFFER_FIELD:
 509
 510                 /*
 511                  * Store into a Buffer or String (not actually a real buffer_field)
 512                  * at a location defined by an Index.
 513                  *
 514                  * The first 8-bit element of the source object is written to the
 515                  * 8-bit Buffer location defined by the Index destination object,
 516                  * according to the ACPI 2.0 specification.
 517                  */
 518
 519                 /*
 520                  * Make sure the target is a Buffer or String. An error should
 521                  * not happen here, since the reference_object was constructed
 522                  * by the INDEX_OP code.
 523                  */
 524                 obj_desc = index_desc->reference.object;
 525                 if ((ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_BUFFER) &&
 526                     (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_STRING)) {
 527                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 528                 }
 529
 530                 /*
 531                  * The assignment of the individual elements will be slightly
 532                  * different for each source type.
 533                  */
 534                 switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
 535                 case ACPI_TYPE_INTEGER:
 536
 537                         /* Use the least-significant byte of the integer */
 538
 539                         value = (u8) (source_desc->integer.value);
 540                         break;
 541
 542                 case ACPI_TYPE_BUFFER:
 543                 case ACPI_TYPE_STRING:
 544
 545                         /* Note: Takes advantage of common string/buffer fields */
 546
 547                         value = source_desc->buffer.pointer[0];
 548                         break;
 549
 550                 default:
 551
 552                         /* All other types are invalid */
 553
 554                         ACPI_ERROR((AE_INFO,
 555                                     "Source must be Integer/Buffer/String type, not %s",
 556                                     acpi_ut_get_object_type_name(source_desc)));
 557                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 558                 }
 559
 560                 /* Store the source value into the target buffer byte */
 561
 562                 obj_desc->buffer.pointer[index_desc->reference.offset] = value;
 563                 break;
 564
 565         default:
 566                 ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
 567                 status = AE_AML_OPERAND_TYPE;
 568                 break;
 569         }
 570
 571         return_ACPI_STATUS(status);
 572 }
 573
 574 /*******************************************************************************
 575  *
 576  * FUNCTION:    acpi_ex_store_object_to_node
 577  *
 578  * PARAMETERS:  source_desc             - Value to be stored
 579  *              Node                    - Named object to receive the value
 580  *              walk_state              - Current walk state
 581  *              implicit_conversion     - Perform implicit conversion (yes/no)
 582  *
 583  * RETURN:      Status
 584  *
 585  * DESCRIPTION: Store the object to the named object.
 586  *
 587  *              The Assignment of an object to a named object is handled here
 588  *              The value passed in will replace the current value (if any)
 589  *              with the input value.
 590  *
 591  *              When storing into an object the data is converted to the
 592  *              target object type then stored in the object.  This means
 593  *              that the target object type (for an initialized target) will
 594  *              not be changed by a store operation.
 595  *
 596  *              Assumes parameters are already validated.
 597  *
 598  ******************************************************************************/
 599
 600 acpi_status
 601 acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
 602                              struct acpi_namespace_node *node,
 603                              struct acpi_walk_state *walk_state,
 604                              u8 implicit_conversion)
 605 {
 606         acpi_status status = AE_OK;
 607         union acpi_operand_object *target_desc;
 608         union acpi_operand_object *new_desc;
 609         acpi_object_type target_type;
 610
 611         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
 612
 613         /* Get current type of the node, and object attached to Node */
 614
 615         target_type = acpi_ns_get_type(node);
 616         target_desc = acpi_ns_get_attached_object(node);
 617
 618         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
 619                           source_desc,
 620                           acpi_ut_get_object_type_name(source_desc), node,
 621                           acpi_ut_get_type_name(target_type)));
 622
 623         /*
 624          * Resolve the source object to an actual value
 625          * (If it is a reference object)
 626          */
 627         status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
 628         if (ACPI_FAILURE(status)) {
 629                 return_ACPI_STATUS(status);
 630         }
 631
 632         /* If no implicit conversion, drop into the default case below */
 633
 634         if ((!implicit_conversion) ||
 635             ((walk_state->opcode == AML_COPY_OP) &&
 636              (target_type != ACPI_TYPE_LOCAL_REGION_FIELD) &&
 637              (target_type != ACPI_TYPE_LOCAL_BANK_FIELD) &&
 638              (target_type != ACPI_TYPE_LOCAL_INDEX_FIELD))) {
 639                 /*
 640                  * Force execution of default (no implicit conversion). Note:
 641                  * copy_object does not perform an implicit conversion, as per the ACPI
 642                  * spec -- except in case of region/bank/index fields -- because these
 643                  * objects must retain their original type permanently.
 644                  */
 645                 target_type = ACPI_TYPE_ANY;
 646         }
 647
 648         /* Do the actual store operation */
 649
 650         switch (target_type) {
 651         case ACPI_TYPE_BUFFER_FIELD:
 652         case ACPI_TYPE_LOCAL_REGION_FIELD:
 653         case ACPI_TYPE_LOCAL_BANK_FIELD:
 654         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 655
 656                 /* For fields, copy the source data to the target field. */
 657
 658                 status = acpi_ex_write_data_to_field(source_desc, target_desc,
 659                                                      &walk_state->result_obj);
 660                 break;
 661
 662         case ACPI_TYPE_INTEGER:
 663         case ACPI_TYPE_STRING:
 664         case ACPI_TYPE_BUFFER:
 665
 666                 /*
 667                  * These target types are all of type Integer/String/Buffer, and
 668                  * therefore support implicit conversion before the store.
 669                  *
 670                  * Copy and/or convert the source object to a new target object
 671                  */
 672                 status =
 673                     acpi_ex_store_object_to_object(source_desc, target_desc,
 674                                                    &new_desc, walk_state);
 675                 if (ACPI_FAILURE(status)) {
 676                         return_ACPI_STATUS(status);
 677                 }
 678
 679                 if (new_desc != target_desc) {
 680                         /*
 681                          * Store the new new_desc as the new value of the Name, and set
 682                          * the Name's type to that of the value being stored in it.
 683                          * source_desc reference count is incremented by attach_object.
 684                          *
 685                          * Note: This may change the type of the node if an explicit store
 686                          * has been performed such that the node/object type has been
 687                          * changed.
 688                          */
 689                         status =
 690                             acpi_ns_attach_object(node, new_desc,
 691                                                   new_desc->common.type);
 692
 693                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 694                                           "Store %s into %s via Convert/Attach\n",
 695                                           acpi_ut_get_object_type_name
 696                                           (source_desc),
 697                                           acpi_ut_get_object_type_name
 698                                           (new_desc)));
 699                 }
 700                 break;
 701
 702         default:
 703
 704                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 705                                   "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
 706                                   acpi_ut_get_object_type_name(source_desc),
 707                                   source_desc, node));
 708
 709                 /* No conversions for all other types.  Just attach the source object */
 710
 711                 status = acpi_ns_attach_object(node, source_desc,
 712                                                ACPI_GET_OBJECT_TYPE
 713                                                (source_desc));
 714                 break;
 715         }
 716
 717         return_ACPI_STATUS(status);
 718 }