drivers/acpi/acpica/dsobject.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsobject - Dispatcher object management routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48 #include "acdispat.h"
  49 #include "acnamesp.h"
  50 #include "acinterp.h"
  51
  52 #define _COMPONENT          ACPI_DISPATCHER
  53 ACPI_MODULE_NAME("dsobject")
  54
  55 /* Local prototypes */
  56 static acpi_status
  57 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
  58                               union acpi_parse_object *op,
  59                               union acpi_operand_object **obj_desc_ptr);
  60
  61 #ifndef ACPI_NO_METHOD_EXECUTION
  62 /*******************************************************************************
  63  *
  64  * FUNCTION:    acpi_ds_build_internal_object
  65  *
  66  * PARAMETERS:  walk_state      - Current walk state
  67  *              Op              - Parser object to be translated
  68  *              obj_desc_ptr    - Where the ACPI internal object is returned
  69  *
  70  * RETURN:      Status
  71  *
  72  * DESCRIPTION: Translate a parser Op object to the equivalent namespace object
  73  *              Simple objects are any objects other than a package object!
  74  *
  75  ******************************************************************************/
  76
  77 static acpi_status
  78 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
  79                               union acpi_parse_object *op,
  80                               union acpi_operand_object **obj_desc_ptr)
  81 {
  82         union acpi_operand_object *obj_desc;
  83         acpi_status status;
  84
  85         ACPI_FUNCTION_TRACE(ds_build_internal_object);
  86
  87         *obj_desc_ptr = NULL;
  88         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
  89                 /*
  90                  * This is a named object reference. If this name was
  91                  * previously looked up in the namespace, it was stored in this op.
  92                  * Otherwise, go ahead and look it up now
  93                  */
  94                 if (!op->common.node) {
  95                         status = acpi_ns_lookup(walk_state->scope_info,
  96                                                 op->common.value.string,
  97                                                 ACPI_TYPE_ANY,
  98                                                 ACPI_IMODE_EXECUTE,
  99                                                 ACPI_NS_SEARCH_PARENT |
 100                                                 ACPI_NS_DONT_OPEN_SCOPE, NULL,
 101                                                 ACPI_CAST_INDIRECT_PTR(struct
 102                                                                        acpi_namespace_node,
 103                                                                        &(op->
 104                                                                          common.
 105                                                                          node)));
 106                         if (ACPI_FAILURE(status)) {
 107
 108                                 /* Check if we are resolving a named reference within a package */
 109
 110                                 if ((status == AE_NOT_FOUND)
 111                                     && (acpi_gbl_enable_interpreter_slack)
 112                                     &&
 113                                     ((op->common.parent->common.aml_opcode ==
 114                                       AML_PACKAGE_OP)
 115                                      || (op->common.parent->common.aml_opcode ==
 116                                          AML_VAR_PACKAGE_OP))) {
 117                                         /*
 118                                          * We didn't find the target and we are populating elements
 119                                          * of a package - ignore if slack enabled. Some ASL code
 120                                          * contains dangling invalid references in packages and
 121                                          * expects that no exception will be issued. Leave the
 122                                          * element as a null element. It cannot be used, but it
 123                                          * can be overwritten by subsequent ASL code - this is
 124                                          * typically the case.
 125                                          */
 126                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 127                                                           "Ignoring unresolved reference in package [%4.4s]\n",
 128                                                           walk_state->
 129                                                           scope_info->scope.
 130                                                           node->name.ascii));
 131
 132                                         return_ACPI_STATUS(AE_OK);
 133                                 } else {
 134                                         ACPI_ERROR_NAMESPACE(op->common.value.
 135                                                              string, status);
 136                                 }
 137
 138                                 return_ACPI_STATUS(status);
 139                         }
 140                 }
 141
 142                 /* Special object resolution for elements of a package */
 143
 144                 if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
 145                     (op->common.parent->common.aml_opcode ==
 146                      AML_VAR_PACKAGE_OP)) {
 147                         /*
 148                          * Attempt to resolve the node to a value before we insert it into
 149                          * the package. If this is a reference to a common data type,
 150                          * resolve it immediately. According to the ACPI spec, package
 151                          * elements can only be "data objects" or method references.
 152                          * Attempt to resolve to an Integer, Buffer, String or Package.
 153                          * If cannot, return the named reference (for things like Devices,
 154                          * Methods, etc.) Buffer Fields and Fields will resolve to simple
 155                          * objects (int/buf/str/pkg).
 156                          *
 157                          * NOTE: References to things like Devices, Methods, Mutexes, etc.
 158                          * will remain as named references. This behavior is not described
 159                          * in the ACPI spec, but it appears to be an oversight.
 160                          */
 161                         obj_desc =
 162                             ACPI_CAST_PTR(union acpi_operand_object,
 163                                           op->common.node);
 164
 165                         status =
 166                             acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
 167                                                           (struct
 168                                                            acpi_namespace_node,
 169                                                            &obj_desc),
 170                                                           walk_state);
 171                         if (ACPI_FAILURE(status)) {
 172                                 return_ACPI_STATUS(status);
 173                         }
 174
 175                         switch (op->common.node->type) {
 176                                 /*
 177                                  * For these types, we need the actual node, not the subobject.
 178                                  * However, the subobject did not get an extra reference count above.
 179                                  *
 180                                  * TBD: should ex_resolve_node_to_value be changed to fix this?
 181                                  */
 182                         case ACPI_TYPE_DEVICE:
 183                         case ACPI_TYPE_THERMAL:
 184
 185                                 acpi_ut_add_reference(op->common.node->object);
 186
 187                                 /*lint -fallthrough */
 188                                 /*
 189                                  * For these types, we need the actual node, not the subobject.
 190                                  * The subobject got an extra reference count in ex_resolve_node_to_value.
 191                                  */
 192                         case ACPI_TYPE_MUTEX:
 193                         case ACPI_TYPE_METHOD:
 194                         case ACPI_TYPE_POWER:
 195                         case ACPI_TYPE_PROCESSOR:
 196                         case ACPI_TYPE_EVENT:
 197                         case ACPI_TYPE_REGION:
 198
 199                                 /* We will create a reference object for these types below */
 200                                 break;
 201
 202                         default:
 203                                 /*
 204                                  * All other types - the node was resolved to an actual
 205                                  * object, we are done.
 206                                  */
 207                                 goto exit;
 208                         }
 209                 }
 210         }
 211
 212         /* Create and init a new internal ACPI object */
 213
 214         obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info
 215                                                    (op->common.aml_opcode))->
 216                                                   object_type);
 217         if (!obj_desc) {
 218                 return_ACPI_STATUS(AE_NO_MEMORY);
 219         }
 220
 221         status =
 222             acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode,
 223                                         &obj_desc);
 224         if (ACPI_FAILURE(status)) {
 225                 acpi_ut_remove_reference(obj_desc);
 226                 return_ACPI_STATUS(status);
 227         }
 228
 229       exit:
 230         *obj_desc_ptr = obj_desc;
 231         return_ACPI_STATUS(status);
 232 }
 233
 234 /*******************************************************************************
 235  *
 236  * FUNCTION:    acpi_ds_build_internal_buffer_obj
 237  *
 238  * PARAMETERS:  walk_state      - Current walk state
 239  *              Op              - Parser object to be translated
 240  *              buffer_length   - Length of the buffer
 241  *              obj_desc_ptr    - Where the ACPI internal object is returned
 242  *
 243  * RETURN:      Status
 244  *
 245  * DESCRIPTION: Translate a parser Op package object to the equivalent
 246  *              namespace object
 247  *
 248  ******************************************************************************/
 249
 250 acpi_status
 251 acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
 252                                   union acpi_parse_object *op,
 253                                   u32 buffer_length,
 254                                   union acpi_operand_object **obj_desc_ptr)
 255 {
 256         union acpi_parse_object *arg;
 257         union acpi_operand_object *obj_desc;
 258         union acpi_parse_object *byte_list;
 259         u32 byte_list_length = 0;
 260
 261         ACPI_FUNCTION_TRACE(ds_build_internal_buffer_obj);
 262
 263         /*
 264          * If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
 265          * The buffer object already exists (from the NS node), otherwise it must
 266          * be created.
 267          */
 268         obj_desc = *obj_desc_ptr;
 269         if (!obj_desc) {
 270
 271                 /* Create a new buffer object */
 272
 273                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
 274                 *obj_desc_ptr = obj_desc;
 275                 if (!obj_desc) {
 276                         return_ACPI_STATUS(AE_NO_MEMORY);
 277                 }
 278         }
 279
 280         /*
 281          * Second arg is the buffer data (optional) byte_list can be either
 282          * individual bytes or a string initializer.  In either case, a
 283          * byte_list appears in the AML.
 284          */
 285         arg = op->common.value.arg;     /* skip first arg */
 286
 287         byte_list = arg->named.next;
 288         if (byte_list) {
 289                 if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) {
 290                         ACPI_ERROR((AE_INFO,
 291                                     "Expecting bytelist, got AML opcode %X in op %p",
 292                                     byte_list->common.aml_opcode, byte_list));
 293
 294                         acpi_ut_remove_reference(obj_desc);
 295                         return (AE_TYPE);
 296                 }
 297
 298                 byte_list_length = (u32) byte_list->common.value.integer;
 299         }
 300
 301         /*
 302          * The buffer length (number of bytes) will be the larger of:
 303          * 1) The specified buffer length and
 304          * 2) The length of the initializer byte list
 305          */
 306         obj_desc->buffer.length = buffer_length;
 307         if (byte_list_length > buffer_length) {
 308                 obj_desc->buffer.length = byte_list_length;
 309         }
 310
 311         /* Allocate the buffer */
 312
 313         if (obj_desc->buffer.length == 0) {
 314                 obj_desc->buffer.pointer = NULL;
 315                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 316                                   "Buffer defined with zero length in AML, creating\n"));
 317         } else {
 318                 obj_desc->buffer.pointer =
 319                     ACPI_ALLOCATE_ZEROED(obj_desc->buffer.length);
 320                 if (!obj_desc->buffer.pointer) {
 321                         acpi_ut_delete_object_desc(obj_desc);
 322                         return_ACPI_STATUS(AE_NO_MEMORY);
 323                 }
 324
 325                 /* Initialize buffer from the byte_list (if present) */
 326
 327                 if (byte_list) {
 328                         ACPI_MEMCPY(obj_desc->buffer.pointer,
 329                                     byte_list->named.data, byte_list_length);
 330                 }
 331         }
 332
 333         obj_desc->buffer.flags |= AOPOBJ_DATA_VALID;
 334         op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
 335         return_ACPI_STATUS(AE_OK);
 336 }
 337
 338 /*******************************************************************************
 339  *
 340  * FUNCTION:    acpi_ds_build_internal_package_obj
 341  *
 342  * PARAMETERS:  walk_state      - Current walk state
 343  *              Op              - Parser object to be translated
 344  *              element_count   - Number of elements in the package - this is
 345  *                                the num_elements argument to Package()
 346  *              obj_desc_ptr    - Where the ACPI internal object is returned
 347  *
 348  * RETURN:      Status
 349  *
 350  * DESCRIPTION: Translate a parser Op package object to the equivalent
 351  *              namespace object
 352  *
 353  * NOTE: The number of elements in the package will be always be the num_elements
 354  * count, regardless of the number of elements in the package list. If
 355  * num_elements is smaller, only that many package list elements are used.
 356  * if num_elements is larger, the Package object is padded out with
 357  * objects of type Uninitialized (as per ACPI spec.)
 358  *
 359  * Even though the ASL compilers do not allow num_elements to be smaller
 360  * than the Package list length (for the fixed length package opcode), some
 361  * BIOS code modifies the AML on the fly to adjust the num_elements, and
 362  * this code compensates for that. This also provides compatibility with
 363  * other AML interpreters.
 364  *
 365  ******************************************************************************/
 366
 367 acpi_status
 368 acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
 369                                    union acpi_parse_object *op,
 370                                    u32 element_count,
 371                                    union acpi_operand_object **obj_desc_ptr)
 372 {
 373         union acpi_parse_object *arg;
 374         union acpi_parse_object *parent;
 375         union acpi_operand_object *obj_desc = NULL;
 376         acpi_status status = AE_OK;
 377         unsigned i;
 378         u16 index;
 379         u16 reference_count;
 380
 381         ACPI_FUNCTION_TRACE(ds_build_internal_package_obj);
 382
 383         /* Find the parent of a possibly nested package */
 384
 385         parent = op->common.parent;
 386         while ((parent->common.aml_opcode == AML_PACKAGE_OP) ||
 387                (parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) {
 388                 parent = parent->common.parent;
 389         }
 390
 391         /*
 392          * If we are evaluating a Named package object "Name (xxxx, Package)",
 393          * the package object already exists, otherwise it must be created.
 394          */
 395         obj_desc = *obj_desc_ptr;
 396         if (!obj_desc) {
 397                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
 398                 *obj_desc_ptr = obj_desc;
 399                 if (!obj_desc) {
 400                         return_ACPI_STATUS(AE_NO_MEMORY);
 401                 }
 402
 403                 obj_desc->package.node = parent->common.node;
 404         }
 405
 406         /*
 407          * Allocate the element array (array of pointers to the individual
 408          * objects) based on the num_elements parameter. Add an extra pointer slot
 409          * so that the list is always null terminated.
 410          */
 411         obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
 412                                                            element_count +
 413                                                            1) * sizeof(void *));
 414
 415         if (!obj_desc->package.elements) {
 416                 acpi_ut_delete_object_desc(obj_desc);
 417                 return_ACPI_STATUS(AE_NO_MEMORY);
 418         }
 419
 420         obj_desc->package.count = element_count;
 421
 422         /*
 423          * Initialize the elements of the package, up to the num_elements count.
 424          * Package is automatically padded with uninitialized (NULL) elements
 425          * if num_elements is greater than the package list length. Likewise,
 426          * Package is truncated if num_elements is less than the list length.
 427          */
 428         arg = op->common.value.arg;
 429         arg = arg->common.next;
 430         for (i = 0; arg && (i < element_count); i++) {
 431                 if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
 432                         if (arg->common.node->type == ACPI_TYPE_METHOD) {
 433                                 /*
 434                                  * A method reference "looks" to the parser to be a method
 435                                  * invocation, so we special case it here
 436                                  */
 437                                 arg->common.aml_opcode = AML_INT_NAMEPATH_OP;
 438                                 status =
 439                                     acpi_ds_build_internal_object(walk_state,
 440                                                                   arg,
 441                                                                   &obj_desc->
 442                                                                   package.
 443                                                                   elements[i]);
 444                         } else {
 445                                 /* This package element is already built, just get it */
 446
 447                                 obj_desc->package.elements[i] =
 448                                     ACPI_CAST_PTR(union acpi_operand_object,
 449                                                   arg->common.node);
 450                         }
 451                 } else {
 452                         status = acpi_ds_build_internal_object(walk_state, arg,
 453                                                                &obj_desc->
 454                                                                package.
 455                                                                elements[i]);
 456                 }
 457
 458                 if (*obj_desc_ptr) {
 459
 460                         /* Existing package, get existing reference count */
 461
 462                         reference_count =
 463                             (*obj_desc_ptr)->common.reference_count;
 464                         if (reference_count > 1) {
 465
 466                                 /* Make new element ref count match original ref count */
 467
 468                                 for (index = 0; index < (reference_count - 1);
 469                                      index++) {
 470                                         acpi_ut_add_reference((obj_desc->
 471                                                                package.
 472                                                                elements[i]));
 473                                 }
 474                         }
 475                 }
 476
 477                 arg = arg->common.next;
 478         }
 479
 480         /* Check for match between num_elements and actual length of package_list */
 481
 482         if (arg) {
 483                 /*
 484                  * num_elements was exhausted, but there are remaining elements in the
 485                  * package_list. Truncate the package to num_elements.
 486                  *
 487                  * Note: technically, this is an error, from ACPI spec: "It is an error
 488                  * for NumElements to be less than the number of elements in the
 489                  * PackageList". However, we just print an error message and
 490                  * no exception is returned. This provides Windows compatibility. Some
 491                  * BIOSs will alter the num_elements on the fly, creating this type
 492                  * of ill-formed package object.
 493                  */
 494                 while (arg) {
 495                         /*
 496                          * We must delete any package elements that were created earlier
 497                          * and are not going to be used because of the package truncation.
 498                          */
 499                         if (arg->common.node) {
 500                                 acpi_ut_remove_reference(ACPI_CAST_PTR
 501                                                          (union
 502                                                           acpi_operand_object,
 503                                                           arg->common.node));
 504                                 arg->common.node = NULL;
 505                         }
 506
 507                         /* Find out how many elements there really are */
 508
 509                         i++;
 510                         arg = arg->common.next;
 511                 }
 512
 513                 ACPI_WARNING((AE_INFO,
 514                             "Package List length (0x%X) larger than NumElements count (0x%X), truncated\n",
 515                             i, element_count));
 516         } else if (i < element_count) {
 517                 /*
 518                  * Arg list (elements) was exhausted, but we did not reach num_elements count.
 519                  * Note: this is not an error, the package is padded out with NULLs.
 520                  */
 521                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 522                                   "Package List length (0x%X) smaller than NumElements count (0x%X), padded with null elements\n",
 523                                   i, element_count));
 524         }
 525
 526         obj_desc->package.flags |= AOPOBJ_DATA_VALID;
 527         op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
 528         return_ACPI_STATUS(status);
 529 }
 530
 531 /*******************************************************************************
 532  *
 533  * FUNCTION:    acpi_ds_create_node
 534  *
 535  * PARAMETERS:  walk_state      - Current walk state
 536  *              Node            - NS Node to be initialized
 537  *              Op              - Parser object to be translated
 538  *
 539  * RETURN:      Status
 540  *
 541  * DESCRIPTION: Create the object to be associated with a namespace node
 542  *
 543  ******************************************************************************/
 544
 545 acpi_status
 546 acpi_ds_create_node(struct acpi_walk_state *walk_state,
 547                     struct acpi_namespace_node *node,
 548                     union acpi_parse_object *op)
 549 {
 550         acpi_status status;
 551         union acpi_operand_object *obj_desc;
 552
 553         ACPI_FUNCTION_TRACE_PTR(ds_create_node, op);
 554
 555         /*
 556          * Because of the execution pass through the non-control-method
 557          * parts of the table, we can arrive here twice.  Only init
 558          * the named object node the first time through
 559          */
 560         if (acpi_ns_get_attached_object(node)) {
 561                 return_ACPI_STATUS(AE_OK);
 562         }
 563
 564         if (!op->common.value.arg) {
 565
 566                 /* No arguments, there is nothing to do */
 567
 568                 return_ACPI_STATUS(AE_OK);
 569         }
 570
 571         /* Build an internal object for the argument(s) */
 572
 573         status = acpi_ds_build_internal_object(walk_state, op->common.value.arg,
 574                                                &obj_desc);
 575         if (ACPI_FAILURE(status)) {
 576                 return_ACPI_STATUS(status);
 577         }
 578
 579         /* Re-type the object according to its argument */
 580
 581         node->type = obj_desc->common.type;
 582
 583         /* Attach obj to node */
 584
 585         status = acpi_ns_attach_object(node, obj_desc, node->type);
 586
 587         /* Remove local reference to the object */
 588
 589         acpi_ut_remove_reference(obj_desc);
 590         return_ACPI_STATUS(status);
 591 }
 592
 593 #endif                          /* ACPI_NO_METHOD_EXECUTION */
 594
 595 /*******************************************************************************
 596  *
 597  * FUNCTION:    acpi_ds_init_object_from_op
 598  *
 599  * PARAMETERS:  walk_state      - Current walk state
 600  *              Op              - Parser op used to init the internal object
 601  *              Opcode          - AML opcode associated with the object
 602  *              ret_obj_desc    - Namespace object to be initialized
 603  *
 604  * RETURN:      Status
 605  *
 606  * DESCRIPTION: Initialize a namespace object from a parser Op and its
 607  *              associated arguments.  The namespace object is a more compact
 608  *              representation of the Op and its arguments.
 609  *
 610  ******************************************************************************/
 611
 612 acpi_status
 613 acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
 614                             union acpi_parse_object *op,
 615                             u16 opcode,
 616                             union acpi_operand_object **ret_obj_desc)
 617 {
 618         const struct acpi_opcode_info *op_info;
 619         union acpi_operand_object *obj_desc;
 620         acpi_status status = AE_OK;
 621
 622         ACPI_FUNCTION_TRACE(ds_init_object_from_op);
 623
 624         obj_desc = *ret_obj_desc;
 625         op_info = acpi_ps_get_opcode_info(opcode);
 626         if (op_info->class == AML_CLASS_UNKNOWN) {
 627
 628                 /* Unknown opcode */
 629
 630                 return_ACPI_STATUS(AE_TYPE);
 631         }
 632
 633         /* Perform per-object initialization */
 634
 635         switch (obj_desc->common.type) {
 636         case ACPI_TYPE_BUFFER:
 637
 638                 /*
 639                  * Defer evaluation of Buffer term_arg operand
 640                  */
 641                 obj_desc->buffer.node =
 642                     ACPI_CAST_PTR(struct acpi_namespace_node,
 643                                   walk_state->operands[0]);
 644                 obj_desc->buffer.aml_start = op->named.data;
 645                 obj_desc->buffer.aml_length = op->named.length;
 646                 break;
 647
 648         case ACPI_TYPE_PACKAGE:
 649
 650                 /*
 651                  * Defer evaluation of Package term_arg operand
 652                  */
 653                 obj_desc->package.node =
 654                     ACPI_CAST_PTR(struct acpi_namespace_node,
 655                                   walk_state->operands[0]);
 656                 obj_desc->package.aml_start = op->named.data;
 657                 obj_desc->package.aml_length = op->named.length;
 658                 break;
 659
 660         case ACPI_TYPE_INTEGER:
 661
 662                 switch (op_info->type) {
 663                 case AML_TYPE_CONSTANT:
 664                         /*
 665                          * Resolve AML Constants here - AND ONLY HERE!
 666                          * All constants are integers.
 667                          * We mark the integer with a flag that indicates that it started
 668                          * life as a constant -- so that stores to constants will perform
 669                          * as expected (noop). zero_op is used as a placeholder for optional
 670                          * target operands.
 671                          */
 672                         obj_desc->common.flags = AOPOBJ_AML_CONSTANT;
 673
 674                         switch (opcode) {
 675                         case AML_ZERO_OP:
 676
 677                                 obj_desc->integer.value = 0;
 678                                 break;
 679
 680                         case AML_ONE_OP:
 681
 682                                 obj_desc->integer.value = 1;
 683                                 break;
 684
 685                         case AML_ONES_OP:
 686
 687                                 obj_desc->integer.value = ACPI_INTEGER_MAX;
 688
 689                                 /* Truncate value if we are executing from a 32-bit ACPI table */
 690
 691 #ifndef ACPI_NO_METHOD_EXECUTION
 692                                 acpi_ex_truncate_for32bit_table(obj_desc);
 693 #endif
 694                                 break;
 695
 696                         case AML_REVISION_OP:
 697
 698                                 obj_desc->integer.value = ACPI_CA_VERSION;
 699                                 break;
 700
 701                         default:
 702
 703                                 ACPI_ERROR((AE_INFO,
 704                                             "Unknown constant opcode %X",
 705                                             opcode));
 706                                 status = AE_AML_OPERAND_TYPE;
 707                                 break;
 708                         }
 709                         break;
 710
 711                 case AML_TYPE_LITERAL:
 712
 713                         obj_desc->integer.value = op->common.value.integer;
 714 #ifndef ACPI_NO_METHOD_EXECUTION
 715                         acpi_ex_truncate_for32bit_table(obj_desc);
 716 #endif
 717                         break;
 718
 719                 default:
 720                         ACPI_ERROR((AE_INFO, "Unknown Integer type %X",
 721                                     op_info->type));
 722                         status = AE_AML_OPERAND_TYPE;
 723                         break;
 724                 }
 725                 break;
 726
 727         case ACPI_TYPE_STRING:
 728
 729                 obj_desc->string.pointer = op->common.value.string;
 730                 obj_desc->string.length =
 731                     (u32) ACPI_STRLEN(op->common.value.string);
 732
 733                 /*
 734                  * The string is contained in the ACPI table, don't ever try
 735                  * to delete it
 736                  */
 737                 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
 738                 break;
 739
 740         case ACPI_TYPE_METHOD:
 741                 break;
 742
 743         case ACPI_TYPE_LOCAL_REFERENCE:
 744
 745                 switch (op_info->type) {
 746                 case AML_TYPE_LOCAL_VARIABLE:
 747
 748                         /* Local ID (0-7) is (AML opcode - base AML_LOCAL_OP) */
 749
 750                         obj_desc->reference.value =
 751                             ((u32)opcode) - AML_LOCAL_OP;
 752                         obj_desc->reference.class = ACPI_REFCLASS_LOCAL;
 753
 754 #ifndef ACPI_NO_METHOD_EXECUTION
 755                         status =
 756                             acpi_ds_method_data_get_node(ACPI_REFCLASS_LOCAL,
 757                                                          obj_desc->reference.
 758                                                          value, walk_state,
 759                                                          ACPI_CAST_INDIRECT_PTR
 760                                                          (struct
 761                                                           acpi_namespace_node,
 762                                                           &obj_desc->reference.
 763                                                           object));
 764 #endif
 765                         break;
 766
 767                 case AML_TYPE_METHOD_ARGUMENT:
 768
 769                         /* Arg ID (0-6) is (AML opcode - base AML_ARG_OP) */
 770
 771                         obj_desc->reference.value = ((u32)opcode) - AML_ARG_OP;
 772                         obj_desc->reference.class = ACPI_REFCLASS_ARG;
 773
 774 #ifndef ACPI_NO_METHOD_EXECUTION
 775                         status = acpi_ds_method_data_get_node(ACPI_REFCLASS_ARG,
 776                                                               obj_desc->
 777                                                               reference.value,
 778                                                               walk_state,
 779                                                               ACPI_CAST_INDIRECT_PTR
 780                                                               (struct
 781                                                                acpi_namespace_node,
 782                                                                &obj_desc->
 783                                                                reference.
 784                                                                object));
 785 #endif
 786                         break;
 787
 788                 default:        /* Object name or Debug object */
 789
 790                         switch (op->common.aml_opcode) {
 791                         case AML_INT_NAMEPATH_OP:
 792
 793                                 /* Node was saved in Op */
 794
 795                                 obj_desc->reference.node = op->common.node;
 796                                 obj_desc->reference.object =
 797                                     op->common.node->object;
 798                                 obj_desc->reference.class = ACPI_REFCLASS_NAME;
 799                                 break;
 800
 801                         case AML_DEBUG_OP:
 802
 803                                 obj_desc->reference.class = ACPI_REFCLASS_DEBUG;
 804                                 break;
 805
 806                         default:
 807
 808                                 ACPI_ERROR((AE_INFO,
 809                                             "Unimplemented reference type for AML opcode: %4.4X",
 810                                             opcode));
 811                                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 812                         }
 813                         break;
 814                 }
 815                 break;
 816
 817         default:
 818
 819                 ACPI_ERROR((AE_INFO, "Unimplemented data type: %X",
 820                             obj_desc->common.type));
 821
 822                 status = AE_AML_OPERAND_TYPE;
 823                 break;
 824         }
 825
 826         return_ACPI_STATUS(status);
 827 }