git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/dispatcher/dsobject.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsobject - Dispatcher object management routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, R. Byron Moore
   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 <acpi/acparser.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acdispat.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acinterp.h>
  50
  51 #define _COMPONENT          ACPI_DISPATCHER
  52 ACPI_MODULE_NAME("dsobject")
  53
  54 /* Local prototypes */
  55 static acpi_status
  56 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
  57                               union acpi_parse_object *op,
  58                               union acpi_operand_object **obj_desc_ptr);
  59
  60 #ifndef ACPI_NO_METHOD_EXECUTION
  61 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_ds_build_internal_object
  64  *
  65  * PARAMETERS:  walk_state      - Current walk state
  66  *              Op              - Parser object to be translated
  67  *              obj_desc_ptr    - Where the ACPI internal object is returned
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: Translate a parser Op object to the equivalent namespace object
  72  *              Simple objects are any objects other than a package object!
  73  *
  74  ******************************************************************************/
  75
  76 static acpi_status
  77 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
  78                               union acpi_parse_object *op,
  79                               union acpi_operand_object **obj_desc_ptr)
  80 {
  81         union acpi_operand_object *obj_desc;
  82         acpi_status status;
  83
  84         ACPI_FUNCTION_TRACE(ds_build_internal_object);
  85
  86         *obj_desc_ptr = NULL;
  87         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
  88                 /*
  89                  * This is a named object reference. If this name was
  90                  * previously looked up in the namespace, it was stored in this op.
  91                  * Otherwise, go ahead and look it up now
  92                  */
  93                 if (!op->common.node) {
  94                         status = acpi_ns_lookup(walk_state->scope_info,
  95                                                 op->common.value.string,
  96                                                 ACPI_TYPE_ANY,
  97                                                 ACPI_IMODE_EXECUTE,
  98                                                 ACPI_NS_SEARCH_PARENT |
  99                                                 ACPI_NS_DONT_OPEN_SCOPE, NULL,
 100                                                 ACPI_CAST_INDIRECT_PTR(struct
 101                                                                        acpi_namespace_node,
 102                                                                        &(op->
 103                                                                          common.
 104                                                                          node)));
 105                         if (ACPI_FAILURE(status)) {
 106
 107                                 /* Check if we are resolving a named reference within a package */
 108
 109                                 if ((status == AE_NOT_FOUND)
 110                                     && (acpi_gbl_enable_interpreter_slack)
 111                                     &&
 112                                     ((op->common.parent->common.aml_opcode ==
 113                                       AML_PACKAGE_OP)
 114                                      || (op->common.parent->common.aml_opcode ==
 115                                          AML_VAR_PACKAGE_OP))) {
 116                                         /*
 117                                          * We didn't find the target and we are populating elements
 118                                          * of a package - ignore if slack enabled. Some ASL code
 119                                          * contains dangling invalid references in packages and
 120                                          * expects that no exception will be issued. Leave the
 121                                          * element as a null element. It cannot be used, but it
 122                                          * can be overwritten by subsequent ASL code - this is
 123                                          * typically the case.
 124                                          */
 125                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 126                                                           "Ignoring unresolved reference in package [%4.4s]\n",
 127                                                           walk_state->
 128                                                           scope_info->scope.
 129                                                           node->name.ascii));
 130
 131                                         return_ACPI_STATUS(AE_OK);
 132                                 } else {
 133                                         ACPI_ERROR_NAMESPACE(op->common.value.
 134                                                              string, status);
 135                                 }
 136
 137                                 return_ACPI_STATUS(status);
 138                         }
 139                 }
 140
 141                 /* Special object resolution for elements of a package */
 142
 143                 if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
 144                     (op->common.parent->common.aml_opcode ==
 145                      AML_VAR_PACKAGE_OP)) {
 146                         /*
 147                          * Attempt to resolve the node to a value before we insert it into
 148                          * the package. If this is a reference to a common data type,
 149                          * resolve it immediately. According to the ACPI spec, package
 150                          * elements can only be "data objects" or method references.
 151                          * Attempt to resolve to an Integer, Buffer, String or Package.
 152                          * If cannot, return the named reference (for things like Devices,
 153                          * Methods, etc.) Buffer Fields and Fields will resolve to simple
 154                          * objects (int/buf/str/pkg).
 155                          *
 156                          * NOTE: References to things like Devices, Methods, Mutexes, etc.
 157                          * will remain as named references. This behavior is not described
 158                          * in the ACPI spec, but it appears to be an oversight.
 159                          */
 160                         obj_desc = (union acpi_operand_object *)op->common.node;
 161
 162                         status =
 163                             acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
 164                                                           (struct
 165                                                            acpi_namespace_node,
 166                                                            &obj_desc),
 167                                                           walk_state);
 168                         if (ACPI_FAILURE(status)) {
 169                                 return_ACPI_STATUS(status);
 170                         }
 171
 172                         switch (op->common.node->type) {
 173                                 /*
 174                                  * For these types, we need the actual node, not the subobject.
 175                                  * However, the subobject did not get an extra reference count above.
 176                                  *
 177                                  * TBD: should ex_resolve_node_to_value be changed to fix this?
 178                                  */
 179                         case ACPI_TYPE_DEVICE:
 180                         case ACPI_TYPE_THERMAL:
 181
 182                                 acpi_ut_add_reference(op->common.node->object);
 183
 184                                 /*lint -fallthrough */
 185                                 /*
 186                                  * For these types, we need the actual node, not the subobject.
 187                                  * The subobject got an extra reference count in ex_resolve_node_to_value.
 188                                  */
 189                         case ACPI_TYPE_MUTEX:
 190                         case ACPI_TYPE_METHOD:
 191                         case ACPI_TYPE_POWER:
 192                         case ACPI_TYPE_PROCESSOR:
 193                         case ACPI_TYPE_EVENT:
 194                         case ACPI_TYPE_REGION:
 195
 196                                 /* We will create a reference object for these types below */
 197                                 break;
 198
 199                         default:
 200                                 /*
 201                                  * All other types - the node was resolved to an actual
 202                                  * object, we are done.
 203                                  */
 204                                 goto exit;
 205                         }
 206                 }
 207         }
 208
 209         /* Create and init a new internal ACPI object */
 210
 211         obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info
 212                                                    (op->common.aml_opcode))->
 213                                                   object_type);
 214         if (!obj_desc) {
 215                 return_ACPI_STATUS(AE_NO_MEMORY);
 216         }
 217
 218         status =
 219             acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode,
 220                                         &obj_desc);
 221         if (ACPI_FAILURE(status)) {
 222                 acpi_ut_remove_reference(obj_desc);
 223                 return_ACPI_STATUS(status);
 224         }
 225
 226       exit:
 227         *obj_desc_ptr = obj_desc;
 228         return_ACPI_STATUS(status);
 229 }
 230
 231 /*******************************************************************************
 232  *
 233  * FUNCTION:    acpi_ds_build_internal_buffer_obj
 234  *
 235  * PARAMETERS:  walk_state      - Current walk state
 236  *              Op              - Parser object to be translated
 237  *              buffer_length   - Length of the buffer
 238  *              obj_desc_ptr    - Where the ACPI internal object is returned
 239  *
 240  * RETURN:      Status
 241  *
 242  * DESCRIPTION: Translate a parser Op package object to the equivalent
 243  *              namespace object
 244  *
 245  ******************************************************************************/
 246
 247 acpi_status
 248 acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
 249                                   union acpi_parse_object *op,
 250                                   u32 buffer_length,
 251                                   union acpi_operand_object **obj_desc_ptr)
 252 {
 253         union acpi_parse_object *arg;
 254         union acpi_operand_object *obj_desc;
 255         union acpi_parse_object *byte_list;
 256         u32 byte_list_length = 0;
 257
 258         ACPI_FUNCTION_TRACE(ds_build_internal_buffer_obj);
 259
 260         /*
 261          * If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
 262          * The buffer object already exists (from the NS node), otherwise it must
 263          * be created.
 264          */
 265         obj_desc = *obj_desc_ptr;
 266         if (!obj_desc) {
 267
 268                 /* Create a new buffer object */
 269
 270                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
 271                 *obj_desc_ptr = obj_desc;
 272                 if (!obj_desc) {
 273                         return_ACPI_STATUS(AE_NO_MEMORY);
 274                 }
 275         }
 276
 277         /*
 278          * Second arg is the buffer data (optional) byte_list can be either
 279          * individual bytes or a string initializer.  In either case, a
 280          * byte_list appears in the AML.
 281          */
 282         arg = op->common.value.arg;     /* skip first arg */
 283
 284         byte_list = arg->named.next;
 285         if (byte_list) {
 286                 if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) {
 287                         ACPI_ERROR((AE_INFO,
 288                                     "Expecting bytelist, got AML opcode %X in op %p",
 289                                     byte_list->common.aml_opcode, byte_list));
 290
 291                         acpi_ut_remove_reference(obj_desc);
 292                         return (AE_TYPE);
 293                 }
 294
 295                 byte_list_length = (u32) byte_list->common.value.integer;
 296         }
 297
 298         /*
 299          * The buffer length (number of bytes) will be the larger of:
 300          * 1) The specified buffer length and
 301          * 2) The length of the initializer byte list
 302          */
 303         obj_desc->buffer.length = buffer_length;
 304         if (byte_list_length > buffer_length) {
 305                 obj_desc->buffer.length = byte_list_length;
 306         }
 307
 308         /* Allocate the buffer */
 309
 310         if (obj_desc->buffer.length == 0) {
 311                 obj_desc->buffer.pointer = NULL;
 312                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 313                                   "Buffer defined with zero length in AML, creating\n"));
 314         } else {
 315                 obj_desc->buffer.pointer =
 316                     ACPI_ALLOCATE_ZEROED(obj_desc->buffer.length);
 317                 if (!obj_desc->buffer.pointer) {
 318                         acpi_ut_delete_object_desc(obj_desc);
 319                         return_ACPI_STATUS(AE_NO_MEMORY);
 320                 }
 321
 322                 /* Initialize buffer from the byte_list (if present) */
 323
 324                 if (byte_list) {
 325                         ACPI_MEMCPY(obj_desc->buffer.pointer,
 326                                     byte_list->named.data, byte_list_length);
 327                 }
 328         }
 329
 330         obj_desc->buffer.flags |= AOPOBJ_DATA_VALID;
 331         op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
 332         return_ACPI_STATUS(AE_OK);
 333 }
 334
 335 /*******************************************************************************
 336  *
 337  * FUNCTION:    acpi_ds_build_internal_package_obj
 338  *
 339  * PARAMETERS:  walk_state      - Current walk state
 340  *              Op              - Parser object to be translated
 341  *              element_count   - Number of elements in the package - this is
 342  *                                the num_elements argument to Package()
 343  *              obj_desc_ptr    - Where the ACPI internal object is returned
 344  *
 345  * RETURN:      Status
 346  *
 347  * DESCRIPTION: Translate a parser Op package object to the equivalent
 348  *              namespace object
 349  *
 350  * NOTE: The number of elements in the package will be always be the num_elements
 351  * count, regardless of the number of elements in the package list. If
 352  * num_elements is smaller, only that many package list elements are used.
 353  * if num_elements is larger, the Package object is padded out with
 354  * objects of type Uninitialized (as per ACPI spec.)
 355  *
 356  * Even though the ASL compilers do not allow num_elements to be smaller
 357  * than the Package list length (for the fixed length package opcode), some
 358  * BIOS code modifies the AML on the fly to adjust the num_elements, and
 359  * this code compensates for that. This also provides compatibility with
 360  * other AML interpreters.
 361  *
 362  ******************************************************************************/
 363
 364 acpi_status
 365 acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
 366                                    union acpi_parse_object *op,
 367                                    u32 element_count,
 368                                    union acpi_operand_object **obj_desc_ptr)
 369 {
 370         union acpi_parse_object *arg;
 371         union acpi_parse_object *parent;
 372         union acpi_operand_object *obj_desc = NULL;
 373         acpi_status status = AE_OK;
 374         acpi_native_uint i;
 375         u16 index;
 376         u16 reference_count;
 377
 378         ACPI_FUNCTION_TRACE(ds_build_internal_package_obj);
 379
 380         /* Find the parent of a possibly nested package */
 381
 382         parent = op->common.parent;
 383         while ((parent->common.aml_opcode == AML_PACKAGE_OP) ||
 384                (parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) {
 385                 parent = parent->common.parent;
 386         }
 387
 388         /*
 389          * If we are evaluating a Named package object "Name (xxxx, Package)",
 390          * the package object already exists, otherwise it must be created.
 391          */
 392         obj_desc = *obj_desc_ptr;
 393         if (!obj_desc) {
 394                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
 395                 *obj_desc_ptr = obj_desc;
 396                 if (!obj_desc) {
 397                         return_ACPI_STATUS(AE_NO_MEMORY);
 398                 }
 399
 400                 obj_desc->package.node = parent->common.node;
 401         }
 402
 403         /*
 404          * Allocate the element array (array of pointers to the individual
 405          * objects) based on the num_elements parameter. Add an extra pointer slot
 406          * so that the list is always null terminated.
 407          */
 408         obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
 409                                                            element_count +
 410                                                            1) * sizeof(void *));
 411
 412         if (!obj_desc->package.elements) {
 413                 acpi_ut_delete_object_desc(obj_desc);
 414                 return_ACPI_STATUS(AE_NO_MEMORY);
 415         }
 416
 417         obj_desc->package.count = element_count;
 418
 419         /*
 420          * Initialize the elements of the package, up to the num_elements count.
 421          * Package is automatically padded with uninitialized (NULL) elements
 422          * if num_elements is greater than the package list length. Likewise,
 423          * Package is truncated if num_elements is less than the list length.
 424          */
 425         arg = op->common.value.arg;
 426         arg = arg->common.next;
 427         for (i = 0; arg && (i < element_count); i++) {
 428                 if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
 429                         if (arg->common.node->type == ACPI_TYPE_METHOD) {
 430                                 /*
 431                                  * A method reference "looks" to the parser to be a method
 432                                  * invocation, so we special case it here
 433                                  */
 434                                 arg->common.aml_opcode = AML_INT_NAMEPATH_OP;
 435                                 status =
 436                                     acpi_ds_build_internal_object(walk_state,
 437                                                                   arg,
 438                                                                   &obj_desc->
 439                                                                   package.
 440                                                                   elements[i]);
 441                         } else {
 442                                 /* This package element is already built, just get it */
 443
 444                                 obj_desc->package.elements[i] =
 445                                     ACPI_CAST_PTR(union acpi_operand_object,
 446                                                   arg->common.node);
 447                         }
 448                 } else {
 449                         status = acpi_ds_build_internal_object(walk_state, arg,
 450                                                                &obj_desc->
 451                                                                package.
 452                                                                elements[i]);
 453                 }
 454
 455                 if (*obj_desc_ptr) {
 456
 457                         /* Existing package, get existing reference count */
 458
 459                         reference_count =
 460                             (*obj_desc_ptr)->common.reference_count;
 461                         if (reference_count > 1) {
 462
 463                                 /* Make new element ref count match original ref count */
 464
 465                                 for (index = 0; index < (reference_count - 1);
 466                                      index++) {
 467                                         acpi_ut_add_reference((obj_desc->
 468                                                                package.
 469                                                                elements[i]));
 470                                 }
 471                         }
 472                 }
 473
 474                 arg = arg->common.next;
 475         }
 476
 477         if (!arg) {
 478                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 479                                   "Package List length larger than NumElements count (%X), truncated\n",
 480                                   element_count));
 481         }
 482
 483         obj_desc->package.flags |= AOPOBJ_DATA_VALID;
 484         op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
 485         return_ACPI_STATUS(status);
 486 }
 487
 488 /*******************************************************************************
 489  *
 490  * FUNCTION:    acpi_ds_create_node
 491  *
 492  * PARAMETERS:  walk_state      - Current walk state
 493  *              Node            - NS Node to be initialized
 494  *              Op              - Parser object to be translated
 495  *
 496  * RETURN:      Status
 497  *
 498  * DESCRIPTION: Create the object to be associated with a namespace node
 499  *
 500  ******************************************************************************/
 501
 502 acpi_status
 503 acpi_ds_create_node(struct acpi_walk_state *walk_state,
 504                     struct acpi_namespace_node *node,
 505                     union acpi_parse_object *op)
 506 {
 507         acpi_status status;
 508         union acpi_operand_object *obj_desc;
 509
 510         ACPI_FUNCTION_TRACE_PTR(ds_create_node, op);
 511
 512         /*
 513          * Because of the execution pass through the non-control-method
 514          * parts of the table, we can arrive here twice.  Only init
 515          * the named object node the first time through
 516          */
 517         if (acpi_ns_get_attached_object(node)) {
 518                 return_ACPI_STATUS(AE_OK);
 519         }
 520
 521         if (!op->common.value.arg) {
 522
 523                 /* No arguments, there is nothing to do */
 524
 525                 return_ACPI_STATUS(AE_OK);
 526         }
 527
 528         /* Build an internal object for the argument(s) */
 529
 530         status = acpi_ds_build_internal_object(walk_state, op->common.value.arg,
 531                                                &obj_desc);
 532         if (ACPI_FAILURE(status)) {
 533                 return_ACPI_STATUS(status);
 534         }
 535
 536         /* Re-type the object according to its argument */
 537
 538         node->type = ACPI_GET_OBJECT_TYPE(obj_desc);
 539
 540         /* Attach obj to node */
 541
 542         status = acpi_ns_attach_object(node, obj_desc, node->type);
 543
 544         /* Remove local reference to the object */
 545
 546         acpi_ut_remove_reference(obj_desc);
 547         return_ACPI_STATUS(status);
 548 }
 549
 550 #endif                          /* ACPI_NO_METHOD_EXECUTION */
 551
 552 /*******************************************************************************
 553  *
 554  * FUNCTION:    acpi_ds_init_object_from_op
 555  *
 556  * PARAMETERS:  walk_state      - Current walk state
 557  *              Op              - Parser op used to init the internal object
 558  *              Opcode          - AML opcode associated with the object
 559  *              ret_obj_desc    - Namespace object to be initialized
 560  *
 561  * RETURN:      Status
 562  *
 563  * DESCRIPTION: Initialize a namespace object from a parser Op and its
 564  *              associated arguments.  The namespace object is a more compact
 565  *              representation of the Op and its arguments.
 566  *
 567  ******************************************************************************/
 568
 569 acpi_status
 570 acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
 571                             union acpi_parse_object *op,
 572                             u16 opcode,
 573                             union acpi_operand_object **ret_obj_desc)
 574 {
 575         const struct acpi_opcode_info *op_info;
 576         union acpi_operand_object *obj_desc;
 577         acpi_status status = AE_OK;
 578
 579         ACPI_FUNCTION_TRACE(ds_init_object_from_op);
 580
 581         obj_desc = *ret_obj_desc;
 582         op_info = acpi_ps_get_opcode_info(opcode);
 583         if (op_info->class == AML_CLASS_UNKNOWN) {
 584
 585                 /* Unknown opcode */
 586
 587                 return_ACPI_STATUS(AE_TYPE);
 588         }
 589
 590         /* Perform per-object initialization */
 591
 592         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 593         case ACPI_TYPE_BUFFER:
 594
 595                 /*
 596                  * Defer evaluation of Buffer term_arg operand
 597                  */
 598                 obj_desc->buffer.node =
 599                     ACPI_CAST_PTR(struct acpi_namespace_node,
 600                                   walk_state->operands[0]);
 601                 obj_desc->buffer.aml_start = op->named.data;
 602                 obj_desc->buffer.aml_length = op->named.length;
 603                 break;
 604
 605         case ACPI_TYPE_PACKAGE:
 606
 607                 /*
 608                  * Defer evaluation of Package term_arg operand
 609                  */
 610                 obj_desc->package.node =
 611                     ACPI_CAST_PTR(struct acpi_namespace_node,
 612                                   walk_state->operands[0]);
 613                 obj_desc->package.aml_start = op->named.data;
 614                 obj_desc->package.aml_length = op->named.length;
 615                 break;
 616
 617         case ACPI_TYPE_INTEGER:
 618
 619                 switch (op_info->type) {
 620                 case AML_TYPE_CONSTANT:
 621                         /*
 622                          * Resolve AML Constants here - AND ONLY HERE!
 623                          * All constants are integers.
 624                          * We mark the integer with a flag that indicates that it started
 625                          * life as a constant -- so that stores to constants will perform
 626                          * as expected (noop). zero_op is used as a placeholder for optional
 627                          * target operands.
 628                          */
 629                         obj_desc->common.flags = AOPOBJ_AML_CONSTANT;
 630
 631                         switch (opcode) {
 632                         case AML_ZERO_OP:
 633
 634                                 obj_desc->integer.value = 0;
 635                                 break;
 636
 637                         case AML_ONE_OP:
 638
 639                                 obj_desc->integer.value = 1;
 640                                 break;
 641
 642                         case AML_ONES_OP:
 643
 644                                 obj_desc->integer.value = ACPI_INTEGER_MAX;
 645
 646                                 /* Truncate value if we are executing from a 32-bit ACPI table */
 647
 648 #ifndef ACPI_NO_METHOD_EXECUTION
 649                                 acpi_ex_truncate_for32bit_table(obj_desc);
 650 #endif
 651                                 break;
 652
 653                         case AML_REVISION_OP:
 654
 655                                 obj_desc->integer.value = ACPI_CA_VERSION;
 656                                 break;
 657
 658                         default:
 659
 660                                 ACPI_ERROR((AE_INFO,
 661                                             "Unknown constant opcode %X",
 662                                             opcode));
 663                                 status = AE_AML_OPERAND_TYPE;
 664                                 break;
 665                         }
 666                         break;
 667
 668                 case AML_TYPE_LITERAL:
 669
 670                         obj_desc->integer.value = op->common.value.integer;
 671 #ifndef ACPI_NO_METHOD_EXECUTION
 672                         acpi_ex_truncate_for32bit_table(obj_desc);
 673 #endif
 674                         break;
 675
 676                 default:
 677                         ACPI_ERROR((AE_INFO, "Unknown Integer type %X",
 678                                     op_info->type));
 679                         status = AE_AML_OPERAND_TYPE;
 680                         break;
 681                 }
 682                 break;
 683
 684         case ACPI_TYPE_STRING:
 685
 686                 obj_desc->string.pointer = op->common.value.string;
 687                 obj_desc->string.length =
 688                     (u32) ACPI_STRLEN(op->common.value.string);
 689
 690                 /*
 691                  * The string is contained in the ACPI table, don't ever try
 692                  * to delete it
 693                  */
 694                 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
 695                 break;
 696
 697         case ACPI_TYPE_METHOD:
 698                 break;
 699
 700         case ACPI_TYPE_LOCAL_REFERENCE:
 701
 702                 switch (op_info->type) {
 703                 case AML_TYPE_LOCAL_VARIABLE:
 704
 705                         /* Split the opcode into a base opcode + offset */
 706
 707                         obj_desc->reference.opcode = AML_LOCAL_OP;
 708                         obj_desc->reference.offset = opcode - AML_LOCAL_OP;
 709
 710 #ifndef ACPI_NO_METHOD_EXECUTION
 711                         status = acpi_ds_method_data_get_node(AML_LOCAL_OP,
 712                                                               obj_desc->
 713                                                               reference.offset,
 714                                                               walk_state,
 715                                                               (struct
 716                                                                acpi_namespace_node
 717                                                                **)&obj_desc->
 718                                                               reference.object);
 719 #endif
 720                         break;
 721
 722                 case AML_TYPE_METHOD_ARGUMENT:
 723
 724                         /* Split the opcode into a base opcode + offset */
 725
 726                         obj_desc->reference.opcode = AML_ARG_OP;
 727                         obj_desc->reference.offset = opcode - AML_ARG_OP;
 728
 729 #ifndef ACPI_NO_METHOD_EXECUTION
 730                         status = acpi_ds_method_data_get_node(AML_ARG_OP,
 731                                                               obj_desc->
 732                                                               reference.offset,
 733                                                               walk_state,
 734                                                               (struct
 735                                                                acpi_namespace_node
 736                                                                **)&obj_desc->
 737                                                               reference.object);
 738 #endif
 739                         break;
 740
 741                 default:        /* Other literals, etc.. */
 742
 743                         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 744
 745                                 /* Node was saved in Op */
 746
 747                                 obj_desc->reference.node = op->common.node;
 748                                 obj_desc->reference.object =
 749                                     op->common.node->object;
 750                         }
 751
 752                         obj_desc->reference.opcode = opcode;
 753                         break;
 754                 }
 755                 break;
 756
 757         default:
 758
 759                 ACPI_ERROR((AE_INFO, "Unimplemented data type: %X",
 760                             ACPI_GET_OBJECT_TYPE(obj_desc)));
 761
 762                 status = AE_AML_OPERAND_TYPE;
 763                 break;
 764         }
 765
 766         return_ACPI_STATUS(status);
 767 }