git.oblomov.eu Git - linux-2.6/blob - 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.
 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, for now, we just print an error message and
 490                  * no exception is returned.
 491                  */
 492                 while (arg) {
 493
 494                         /* Find out how many elements there really are */
 495
 496                         i++;
 497                         arg = arg->common.next;
 498                 }
 499
 500                 ACPI_WARNING((AE_INFO,
 501                             "Package List length (%X) larger than NumElements count (%X), truncated\n",
 502                             i, element_count));
 503         } else if (i < element_count) {
 504                 /*
 505                  * Arg list (elements) was exhausted, but we did not reach num_elements count.
 506                  * Note: this is not an error, the package is padded out with NULLs.
 507                  */
 508                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 509                                   "Package List length (%X) smaller than NumElements count (%X), padded with null elements\n",
 510                                   i, element_count));
 511         }
 512
 513         obj_desc->package.flags |= AOPOBJ_DATA_VALID;
 514         op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
 515         return_ACPI_STATUS(status);
 516 }
 517
 518 /*******************************************************************************
 519  *
 520  * FUNCTION:    acpi_ds_create_node
 521  *
 522  * PARAMETERS:  walk_state      - Current walk state
 523  *              Node            - NS Node to be initialized
 524  *              Op              - Parser object to be translated
 525  *
 526  * RETURN:      Status
 527  *
 528  * DESCRIPTION: Create the object to be associated with a namespace node
 529  *
 530  ******************************************************************************/
 531
 532 acpi_status
 533 acpi_ds_create_node(struct acpi_walk_state *walk_state,
 534                     struct acpi_namespace_node *node,
 535                     union acpi_parse_object *op)
 536 {
 537         acpi_status status;
 538         union acpi_operand_object *obj_desc;
 539
 540         ACPI_FUNCTION_TRACE_PTR(ds_create_node, op);
 541
 542         /*
 543          * Because of the execution pass through the non-control-method
 544          * parts of the table, we can arrive here twice.  Only init
 545          * the named object node the first time through
 546          */
 547         if (acpi_ns_get_attached_object(node)) {
 548                 return_ACPI_STATUS(AE_OK);
 549         }
 550
 551         if (!op->common.value.arg) {
 552
 553                 /* No arguments, there is nothing to do */
 554
 555                 return_ACPI_STATUS(AE_OK);
 556         }
 557
 558         /* Build an internal object for the argument(s) */
 559
 560         status = acpi_ds_build_internal_object(walk_state, op->common.value.arg,
 561                                                &obj_desc);
 562         if (ACPI_FAILURE(status)) {
 563                 return_ACPI_STATUS(status);
 564         }
 565
 566         /* Re-type the object according to its argument */
 567
 568         node->type = ACPI_GET_OBJECT_TYPE(obj_desc);
 569
 570         /* Attach obj to node */
 571
 572         status = acpi_ns_attach_object(node, obj_desc, node->type);
 573
 574         /* Remove local reference to the object */
 575
 576         acpi_ut_remove_reference(obj_desc);
 577         return_ACPI_STATUS(status);
 578 }
 579
 580 #endif                          /* ACPI_NO_METHOD_EXECUTION */
 581
 582 /*******************************************************************************
 583  *
 584  * FUNCTION:    acpi_ds_init_object_from_op
 585  *
 586  * PARAMETERS:  walk_state      - Current walk state
 587  *              Op              - Parser op used to init the internal object
 588  *              Opcode          - AML opcode associated with the object
 589  *              ret_obj_desc    - Namespace object to be initialized
 590  *
 591  * RETURN:      Status
 592  *
 593  * DESCRIPTION: Initialize a namespace object from a parser Op and its
 594  *              associated arguments.  The namespace object is a more compact
 595  *              representation of the Op and its arguments.
 596  *
 597  ******************************************************************************/
 598
 599 acpi_status
 600 acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
 601                             union acpi_parse_object *op,
 602                             u16 opcode,
 603                             union acpi_operand_object **ret_obj_desc)
 604 {
 605         const struct acpi_opcode_info *op_info;
 606         union acpi_operand_object *obj_desc;
 607         acpi_status status = AE_OK;
 608
 609         ACPI_FUNCTION_TRACE(ds_init_object_from_op);
 610
 611         obj_desc = *ret_obj_desc;
 612         op_info = acpi_ps_get_opcode_info(opcode);
 613         if (op_info->class == AML_CLASS_UNKNOWN) {
 614
 615                 /* Unknown opcode */
 616
 617                 return_ACPI_STATUS(AE_TYPE);
 618         }
 619
 620         /* Perform per-object initialization */
 621
 622         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 623         case ACPI_TYPE_BUFFER:
 624
 625                 /*
 626                  * Defer evaluation of Buffer term_arg operand
 627                  */
 628                 obj_desc->buffer.node =
 629                     ACPI_CAST_PTR(struct acpi_namespace_node,
 630                                   walk_state->operands[0]);
 631                 obj_desc->buffer.aml_start = op->named.data;
 632                 obj_desc->buffer.aml_length = op->named.length;
 633                 break;
 634
 635         case ACPI_TYPE_PACKAGE:
 636
 637                 /*
 638                  * Defer evaluation of Package term_arg operand
 639                  */
 640                 obj_desc->package.node =
 641                     ACPI_CAST_PTR(struct acpi_namespace_node,
 642                                   walk_state->operands[0]);
 643                 obj_desc->package.aml_start = op->named.data;
 644                 obj_desc->package.aml_length = op->named.length;
 645                 break;
 646
 647         case ACPI_TYPE_INTEGER:
 648
 649                 switch (op_info->type) {
 650                 case AML_TYPE_CONSTANT:
 651                         /*
 652                          * Resolve AML Constants here - AND ONLY HERE!
 653                          * All constants are integers.
 654                          * We mark the integer with a flag that indicates that it started
 655                          * life as a constant -- so that stores to constants will perform
 656                          * as expected (noop). zero_op is used as a placeholder for optional
 657                          * target operands.
 658                          */
 659                         obj_desc->common.flags = AOPOBJ_AML_CONSTANT;
 660
 661                         switch (opcode) {
 662                         case AML_ZERO_OP:
 663
 664                                 obj_desc->integer.value = 0;
 665                                 break;
 666
 667                         case AML_ONE_OP:
 668
 669                                 obj_desc->integer.value = 1;
 670                                 break;
 671
 672                         case AML_ONES_OP:
 673
 674                                 obj_desc->integer.value = ACPI_INTEGER_MAX;
 675
 676                                 /* Truncate value if we are executing from a 32-bit ACPI table */
 677
 678 #ifndef ACPI_NO_METHOD_EXECUTION
 679                                 acpi_ex_truncate_for32bit_table(obj_desc);
 680 #endif
 681                                 break;
 682
 683                         case AML_REVISION_OP:
 684
 685                                 obj_desc->integer.value = ACPI_CA_VERSION;
 686                                 break;
 687
 688                         default:
 689
 690                                 ACPI_ERROR((AE_INFO,
 691                                             "Unknown constant opcode %X",
 692                                             opcode));
 693                                 status = AE_AML_OPERAND_TYPE;
 694                                 break;
 695                         }
 696                         break;
 697
 698                 case AML_TYPE_LITERAL:
 699
 700                         obj_desc->integer.value = op->common.value.integer;
 701 #ifndef ACPI_NO_METHOD_EXECUTION
 702                         acpi_ex_truncate_for32bit_table(obj_desc);
 703 #endif
 704                         break;
 705
 706                 default:
 707                         ACPI_ERROR((AE_INFO, "Unknown Integer type %X",
 708                                     op_info->type));
 709                         status = AE_AML_OPERAND_TYPE;
 710                         break;
 711                 }
 712                 break;
 713
 714         case ACPI_TYPE_STRING:
 715
 716                 obj_desc->string.pointer = op->common.value.string;
 717                 obj_desc->string.length =
 718                     (u32) ACPI_STRLEN(op->common.value.string);
 719
 720                 /*
 721                  * The string is contained in the ACPI table, don't ever try
 722                  * to delete it
 723                  */
 724                 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
 725                 break;
 726
 727         case ACPI_TYPE_METHOD:
 728                 break;
 729
 730         case ACPI_TYPE_LOCAL_REFERENCE:
 731
 732                 switch (op_info->type) {
 733                 case AML_TYPE_LOCAL_VARIABLE:
 734
 735                         /* Local ID (0-7) is (AML opcode - base AML_LOCAL_OP) */
 736
 737                         obj_desc->reference.value = opcode - AML_LOCAL_OP;
 738                         obj_desc->reference.class = ACPI_REFCLASS_LOCAL;
 739
 740 #ifndef ACPI_NO_METHOD_EXECUTION
 741                         status =
 742                             acpi_ds_method_data_get_node(ACPI_REFCLASS_LOCAL,
 743                                                          obj_desc->reference.
 744                                                          value, walk_state,
 745                                                          ACPI_CAST_INDIRECT_PTR
 746                                                          (struct
 747                                                           acpi_namespace_node,
 748                                                           &obj_desc->reference.
 749                                                           object));
 750 #endif
 751                         break;
 752
 753                 case AML_TYPE_METHOD_ARGUMENT:
 754
 755                         /* Arg ID (0-6) is (AML opcode - base AML_ARG_OP) */
 756
 757                         obj_desc->reference.value = opcode - AML_ARG_OP;
 758                         obj_desc->reference.class = ACPI_REFCLASS_ARG;
 759
 760 #ifndef ACPI_NO_METHOD_EXECUTION
 761                         status = acpi_ds_method_data_get_node(ACPI_REFCLASS_ARG,
 762                                                               obj_desc->
 763                                                               reference.value,
 764                                                               walk_state,
 765                                                               ACPI_CAST_INDIRECT_PTR
 766                                                               (struct
 767                                                                acpi_namespace_node,
 768                                                                &obj_desc->
 769                                                                reference.
 770                                                                object));
 771 #endif
 772                         break;
 773
 774                 default:        /* Object name or Debug object */
 775
 776                         switch (op->common.aml_opcode) {
 777                         case AML_INT_NAMEPATH_OP:
 778
 779                                 /* Node was saved in Op */
 780
 781                                 obj_desc->reference.node = op->common.node;
 782                                 obj_desc->reference.object =
 783                                     op->common.node->object;
 784                                 obj_desc->reference.class = ACPI_REFCLASS_NAME;
 785                                 break;
 786
 787                         case AML_DEBUG_OP:
 788
 789                                 obj_desc->reference.class = ACPI_REFCLASS_DEBUG;
 790                                 break;
 791
 792                         default:
 793
 794                                 ACPI_ERROR((AE_INFO,
 795                                             "Unimplemented reference type for AML opcode: %4.4X",
 796                                             opcode));
 797                                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 798                         }
 799                         break;
 800                 }
 801                 break;
 802
 803         default:
 804
 805                 ACPI_ERROR((AE_INFO, "Unimplemented data type: %X",
 806                             ACPI_GET_OBJECT_TYPE(obj_desc)));
 807
 808                 status = AE_AML_OPERAND_TYPE;
 809                 break;
 810         }
 811
 812         return_ACPI_STATUS(status);
 813 }