drivers/acpi/acpica/dswload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswload - Dispatcher namespace load callbacks
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2011, 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 "acinterp.h"
  50 #include "acnamesp.h"
  51 #include "acevents.h"
  52
  53 #ifdef ACPI_ASL_COMPILER
  54 #include <acpi/acdisasm.h>
  55 #endif
  56
  57 #define _COMPONENT          ACPI_DISPATCHER
  58 ACPI_MODULE_NAME("dswload")
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ds_init_callbacks
  63  *
  64  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  65  *              pass_number     - 1, 2, or 3
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Init walk state callbacks
  70  *
  71  ******************************************************************************/
  72 acpi_status
  73 acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
  74 {
  75
  76         switch (pass_number) {
  77         case 1:
  78                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  79                     ACPI_PARSE_DELETE_TREE;
  80                 walk_state->descending_callback = acpi_ds_load1_begin_op;
  81                 walk_state->ascending_callback = acpi_ds_load1_end_op;
  82                 break;
  83
  84         case 2:
  85                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  86                     ACPI_PARSE_DELETE_TREE;
  87                 walk_state->descending_callback = acpi_ds_load2_begin_op;
  88                 walk_state->ascending_callback = acpi_ds_load2_end_op;
  89                 break;
  90
  91         case 3:
  92 #ifndef ACPI_NO_METHOD_EXECUTION
  93                 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
  94                     ACPI_PARSE_DELETE_TREE;
  95                 walk_state->descending_callback = acpi_ds_exec_begin_op;
  96                 walk_state->ascending_callback = acpi_ds_exec_end_op;
  97 #endif
  98                 break;
  99
 100         default:
 101                 return (AE_BAD_PARAMETER);
 102         }
 103
 104         return (AE_OK);
 105 }
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    acpi_ds_load1_begin_op
 110  *
 111  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 112  *              out_op          - Where to return op if a new one is created
 113  *
 114  * RETURN:      Status
 115  *
 116  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 117  *
 118  ******************************************************************************/
 119
 120 acpi_status
 121 acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 122                        union acpi_parse_object ** out_op)
 123 {
 124         union acpi_parse_object *op;
 125         struct acpi_namespace_node *node;
 126         acpi_status status;
 127         acpi_object_type object_type;
 128         char *path;
 129         u32 flags;
 130
 131         ACPI_FUNCTION_TRACE(ds_load1_begin_op);
 132
 133         op = walk_state->op;
 134         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 135                           walk_state));
 136
 137         /* We are only interested in opcodes that have an associated name */
 138
 139         if (op) {
 140                 if (!(walk_state->op_info->flags & AML_NAMED)) {
 141                         *out_op = op;
 142                         return_ACPI_STATUS(AE_OK);
 143                 }
 144
 145                 /* Check if this object has already been installed in the namespace */
 146
 147                 if (op->common.node) {
 148                         *out_op = op;
 149                         return_ACPI_STATUS(AE_OK);
 150                 }
 151         }
 152
 153         path = acpi_ps_get_next_namestring(&walk_state->parser_state);
 154
 155         /* Map the raw opcode into an internal object type */
 156
 157         object_type = walk_state->op_info->object_type;
 158
 159         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 160                           "State=%p Op=%p [%s]\n", walk_state, op,
 161                           acpi_ut_get_type_name(object_type)));
 162
 163         switch (walk_state->opcode) {
 164         case AML_SCOPE_OP:
 165
 166                 /*
 167                  * The target name of the Scope() operator must exist at this point so
 168                  * that we can actually open the scope to enter new names underneath it.
 169                  * Allow search-to-root for single namesegs.
 170                  */
 171                 status =
 172                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 173                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 174                                    walk_state, &(node));
 175 #ifdef ACPI_ASL_COMPILER
 176                 if (status == AE_NOT_FOUND) {
 177                         /*
 178                          * Table disassembly:
 179                          * Target of Scope() not found. Generate an External for it, and
 180                          * insert the name into the namespace.
 181                          */
 182                         acpi_dm_add_to_external_list(path, ACPI_TYPE_DEVICE, 0);
 183                         status =
 184                             acpi_ns_lookup(walk_state->scope_info, path,
 185                                            object_type, ACPI_IMODE_LOAD_PASS1,
 186                                            ACPI_NS_SEARCH_PARENT, walk_state,
 187                                            &node);
 188                 }
 189 #endif
 190                 if (ACPI_FAILURE(status)) {
 191                         ACPI_ERROR_NAMESPACE(path, status);
 192                         return_ACPI_STATUS(status);
 193                 }
 194
 195                 /*
 196                  * Check to make sure that the target is
 197                  * one of the opcodes that actually opens a scope
 198                  */
 199                 switch (node->type) {
 200                 case ACPI_TYPE_ANY:
 201                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope  */
 202                 case ACPI_TYPE_DEVICE:
 203                 case ACPI_TYPE_POWER:
 204                 case ACPI_TYPE_PROCESSOR:
 205                 case ACPI_TYPE_THERMAL:
 206
 207                         /* These are acceptable types */
 208                         break;
 209
 210                 case ACPI_TYPE_INTEGER:
 211                 case ACPI_TYPE_STRING:
 212                 case ACPI_TYPE_BUFFER:
 213
 214                         /*
 215                          * These types we will allow, but we will change the type.
 216                          * This enables some existing code of the form:
 217                          *
 218                          *  Name (DEB, 0)
 219                          *  Scope (DEB) { ... }
 220                          *
 221                          * Note: silently change the type here. On the second pass,
 222                          * we will report a warning
 223                          */
 224                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 225                                           "Type override - [%4.4s] had invalid type (%s) "
 226                                           "for Scope operator, changed to type ANY\n",
 227                                           acpi_ut_get_node_name(node),
 228                                           acpi_ut_get_type_name(node->type)));
 229
 230                         node->type = ACPI_TYPE_ANY;
 231                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 232                         break;
 233
 234                 default:
 235
 236                         /* All other types are an error */
 237
 238                         ACPI_ERROR((AE_INFO,
 239                                     "Invalid type (%s) for target of "
 240                                     "Scope operator [%4.4s] (Cannot override)",
 241                                     acpi_ut_get_type_name(node->type),
 242                                     acpi_ut_get_node_name(node)));
 243
 244                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 245                 }
 246                 break;
 247
 248         default:
 249                 /*
 250                  * For all other named opcodes, we will enter the name into
 251                  * the namespace.
 252                  *
 253                  * Setup the search flags.
 254                  * Since we are entering a name into the namespace, we do not want to
 255                  * enable the search-to-root upsearch.
 256                  *
 257                  * There are only two conditions where it is acceptable that the name
 258                  * already exists:
 259                  *    1) the Scope() operator can reopen a scoping object that was
 260                  *       previously defined (Scope, Method, Device, etc.)
 261                  *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
 262                  *       buffer_field, or Package), the name of the object is already
 263                  *       in the namespace.
 264                  */
 265                 if (walk_state->deferred_node) {
 266
 267                         /* This name is already in the namespace, get the node */
 268
 269                         node = walk_state->deferred_node;
 270                         status = AE_OK;
 271                         break;
 272                 }
 273
 274                 /*
 275                  * If we are executing a method, do not create any namespace objects
 276                  * during the load phase, only during execution.
 277                  */
 278                 if (walk_state->method_node) {
 279                         node = NULL;
 280                         status = AE_OK;
 281                         break;
 282                 }
 283
 284                 flags = ACPI_NS_NO_UPSEARCH;
 285                 if ((walk_state->opcode != AML_SCOPE_OP) &&
 286                     (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
 287                         flags |= ACPI_NS_ERROR_IF_FOUND;
 288                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 289                                           "[%s] Cannot already exist\n",
 290                                           acpi_ut_get_type_name(object_type)));
 291                 } else {
 292                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 293                                           "[%s] Both Find or Create allowed\n",
 294                                           acpi_ut_get_type_name(object_type)));
 295                 }
 296
 297                 /*
 298                  * Enter the named type into the internal namespace. We enter the name
 299                  * as we go downward in the parse tree. Any necessary subobjects that
 300                  * involve arguments to the opcode must be created as we go back up the
 301                  * parse tree later.
 302                  */
 303                 status =
 304                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 305                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
 306                                    &node);
 307                 if (ACPI_FAILURE(status)) {
 308                         if (status == AE_ALREADY_EXISTS) {
 309
 310                                 /* The name already exists in this scope */
 311
 312                                 if (node->flags & ANOBJ_IS_EXTERNAL) {
 313                                         /*
 314                                          * Allow one create on an object or segment that was
 315                                          * previously declared External
 316                                          */
 317                                         node->flags &= ~ANOBJ_IS_EXTERNAL;
 318                                         node->type = (u8) object_type;
 319
 320                                         /* Just retyped a node, probably will need to open a scope */
 321
 322                                         if (acpi_ns_opens_scope(object_type)) {
 323                                                 status =
 324                                                     acpi_ds_scope_stack_push
 325                                                     (node, object_type,
 326                                                      walk_state);
 327                                                 if (ACPI_FAILURE(status)) {
 328                                                         return_ACPI_STATUS
 329                                                             (status);
 330                                                 }
 331                                         }
 332
 333                                         status = AE_OK;
 334                                 }
 335                         }
 336
 337                         if (ACPI_FAILURE(status)) {
 338                                 ACPI_ERROR_NAMESPACE(path, status);
 339                                 return_ACPI_STATUS(status);
 340                         }
 341                 }
 342                 break;
 343         }
 344
 345         /* Common exit */
 346
 347         if (!op) {
 348
 349                 /* Create a new op */
 350
 351                 op = acpi_ps_alloc_op(walk_state->opcode);
 352                 if (!op) {
 353                         return_ACPI_STATUS(AE_NO_MEMORY);
 354                 }
 355         }
 356
 357         /* Initialize the op */
 358
 359 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
 360         op->named.path = ACPI_CAST_PTR(u8, path);
 361 #endif
 362
 363         if (node) {
 364                 /*
 365                  * Put the Node in the "op" object that the parser uses, so we
 366                  * can get it again quickly when this scope is closed
 367                  */
 368                 op->common.node = node;
 369                 op->named.name = node->name.integer;
 370         }
 371
 372         acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
 373                            op);
 374         *out_op = op;
 375         return_ACPI_STATUS(status);
 376 }
 377
 378 /*******************************************************************************
 379  *
 380  * FUNCTION:    acpi_ds_load1_end_op
 381  *
 382  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 383  *
 384  * RETURN:      Status
 385  *
 386  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 387  *              both control methods and everything else.
 388  *
 389  ******************************************************************************/
 390
 391 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 392 {
 393         union acpi_parse_object *op;
 394         acpi_object_type object_type;
 395         acpi_status status = AE_OK;
 396
 397         ACPI_FUNCTION_TRACE(ds_load1_end_op);
 398
 399         op = walk_state->op;
 400         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 401                           walk_state));
 402
 403         /* We are only interested in opcodes that have an associated name */
 404
 405         if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
 406                 return_ACPI_STATUS(AE_OK);
 407         }
 408
 409         /* Get the object type to determine if we should pop the scope */
 410
 411         object_type = walk_state->op_info->object_type;
 412
 413 #ifndef ACPI_NO_METHOD_EXECUTION
 414         if (walk_state->op_info->flags & AML_FIELD) {
 415                 /*
 416                  * If we are executing a method, do not create any namespace objects
 417                  * during the load phase, only during execution.
 418                  */
 419                 if (!walk_state->method_node) {
 420                         if (walk_state->opcode == AML_FIELD_OP ||
 421                             walk_state->opcode == AML_BANK_FIELD_OP ||
 422                             walk_state->opcode == AML_INDEX_FIELD_OP) {
 423                                 status =
 424                                     acpi_ds_init_field_objects(op, walk_state);
 425                         }
 426                 }
 427                 return_ACPI_STATUS(status);
 428         }
 429
 430         /*
 431          * If we are executing a method, do not create any namespace objects
 432          * during the load phase, only during execution.
 433          */
 434         if (!walk_state->method_node) {
 435                 if (op->common.aml_opcode == AML_REGION_OP) {
 436                         status =
 437                             acpi_ex_create_region(op->named.data,
 438                                                   op->named.length,
 439                                                   (acpi_adr_space_type) ((op->
 440                                                                           common.
 441                                                                           value.
 442                                                                           arg)->
 443                                                                          common.
 444                                                                          value.
 445                                                                          integer),
 446                                                   walk_state);
 447                         if (ACPI_FAILURE(status)) {
 448                                 return_ACPI_STATUS(status);
 449                         }
 450                 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 451                         status =
 452                             acpi_ex_create_region(op->named.data,
 453                                                   op->named.length,
 454                                                   REGION_DATA_TABLE,
 455                                                   walk_state);
 456                         if (ACPI_FAILURE(status)) {
 457                                 return_ACPI_STATUS(status);
 458                         }
 459                 }
 460         }
 461 #endif
 462
 463         if (op->common.aml_opcode == AML_NAME_OP) {
 464
 465                 /* For Name opcode, get the object type from the argument */
 466
 467                 if (op->common.value.arg) {
 468                         object_type = (acpi_ps_get_opcode_info((op->common.
 469                                                                 value.arg)->
 470                                                                common.
 471                                                                aml_opcode))->
 472                             object_type;
 473
 474                         /* Set node type if we have a namespace node */
 475
 476                         if (op->common.node) {
 477                                 op->common.node->type = (u8) object_type;
 478                         }
 479                 }
 480         }
 481
 482         /*
 483          * If we are executing a method, do not create any namespace objects
 484          * during the load phase, only during execution.
 485          */
 486         if (!walk_state->method_node) {
 487                 if (op->common.aml_opcode == AML_METHOD_OP) {
 488                         /*
 489                          * method_op pkg_length name_string method_flags term_list
 490                          *
 491                          * Note: We must create the method node/object pair as soon as we
 492                          * see the method declaration. This allows later pass1 parsing
 493                          * of invocations of the method (need to know the number of
 494                          * arguments.)
 495                          */
 496                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 497                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 498                                           walk_state, op, op->named.node));
 499
 500                         if (!acpi_ns_get_attached_object(op->named.node)) {
 501                                 walk_state->operands[0] =
 502                                     ACPI_CAST_PTR(void, op->named.node);
 503                                 walk_state->num_operands = 1;
 504
 505                                 status =
 506                                     acpi_ds_create_operands(walk_state,
 507                                                             op->common.value.
 508                                                             arg);
 509                                 if (ACPI_SUCCESS(status)) {
 510                                         status =
 511                                             acpi_ex_create_method(op->named.
 512                                                                   data,
 513                                                                   op->named.
 514                                                                   length,
 515                                                                   walk_state);
 516                                 }
 517
 518                                 walk_state->operands[0] = NULL;
 519                                 walk_state->num_operands = 0;
 520
 521                                 if (ACPI_FAILURE(status)) {
 522                                         return_ACPI_STATUS(status);
 523                                 }
 524                         }
 525                 }
 526         }
 527
 528         /* Pop the scope stack (only if loading a table) */
 529
 530         if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
 531                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 532                                   "(%s): Popping scope for Op %p\n",
 533                                   acpi_ut_get_type_name(object_type), op));
 534
 535                 status = acpi_ds_scope_stack_pop(walk_state);
 536         }
 537
 538         return_ACPI_STATUS(status);
 539 }
 540
 541 /*******************************************************************************
 542  *
 543  * FUNCTION:    acpi_ds_load2_begin_op
 544  *
 545  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 546  *              out_op          - Wher to return op if a new one is created
 547  *
 548  * RETURN:      Status
 549  *
 550  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 551  *
 552  ******************************************************************************/
 553
 554 acpi_status
 555 acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 556                        union acpi_parse_object **out_op)
 557 {
 558         union acpi_parse_object *op;
 559         struct acpi_namespace_node *node;
 560         acpi_status status;
 561         acpi_object_type object_type;
 562         char *buffer_ptr;
 563         u32 flags;
 564
 565         ACPI_FUNCTION_TRACE(ds_load2_begin_op);
 566
 567         op = walk_state->op;
 568         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 569                           walk_state));
 570
 571         if (op) {
 572                 if ((walk_state->control_state) &&
 573                     (walk_state->control_state->common.state ==
 574                      ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 575
 576                         /* We are executing a while loop outside of a method */
 577
 578                         status = acpi_ds_exec_begin_op(walk_state, out_op);
 579                         return_ACPI_STATUS(status);
 580                 }
 581
 582                 /* We only care about Namespace opcodes here */
 583
 584                 if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
 585                      (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
 586                     (!(walk_state->op_info->flags & AML_NAMED))) {
 587                         return_ACPI_STATUS(AE_OK);
 588                 }
 589
 590                 /* Get the name we are going to enter or lookup in the namespace */
 591
 592                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 593
 594                         /* For Namepath op, get the path string */
 595
 596                         buffer_ptr = op->common.value.string;
 597                         if (!buffer_ptr) {
 598
 599                                 /* No name, just exit */
 600
 601                                 return_ACPI_STATUS(AE_OK);
 602                         }
 603                 } else {
 604                         /* Get name from the op */
 605
 606                         buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
 607                 }
 608         } else {
 609                 /* Get the namestring from the raw AML */
 610
 611                 buffer_ptr =
 612                     acpi_ps_get_next_namestring(&walk_state->parser_state);
 613         }
 614
 615         /* Map the opcode into an internal object type */
 616
 617         object_type = walk_state->op_info->object_type;
 618
 619         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 620                           "State=%p Op=%p Type=%X\n", walk_state, op,
 621                           object_type));
 622
 623         switch (walk_state->opcode) {
 624         case AML_FIELD_OP:
 625         case AML_BANK_FIELD_OP:
 626         case AML_INDEX_FIELD_OP:
 627
 628                 node = NULL;
 629                 status = AE_OK;
 630                 break;
 631
 632         case AML_INT_NAMEPATH_OP:
 633                 /*
 634                  * The name_path is an object reference to an existing object.
 635                  * Don't enter the name into the namespace, but look it up
 636                  * for use later.
 637                  */
 638                 status =
 639                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 640                                    object_type, ACPI_IMODE_EXECUTE,
 641                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 642                 break;
 643
 644         case AML_SCOPE_OP:
 645
 646                 /* Special case for Scope(\) -> refers to the Root node */
 647
 648                 if (op && (op->named.node == acpi_gbl_root_node)) {
 649                         node = op->named.node;
 650
 651                         status =
 652                             acpi_ds_scope_stack_push(node, object_type,
 653                                                      walk_state);
 654                         if (ACPI_FAILURE(status)) {
 655                                 return_ACPI_STATUS(status);
 656                         }
 657                 } else {
 658                         /*
 659                          * The Path is an object reference to an existing object.
 660                          * Don't enter the name into the namespace, but look it up
 661                          * for use later.
 662                          */
 663                         status =
 664                             acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 665                                            object_type, ACPI_IMODE_EXECUTE,
 666                                            ACPI_NS_SEARCH_PARENT, walk_state,
 667                                            &(node));
 668                         if (ACPI_FAILURE(status)) {
 669 #ifdef ACPI_ASL_COMPILER
 670                                 if (status == AE_NOT_FOUND) {
 671                                         status = AE_OK;
 672                                 } else {
 673                                         ACPI_ERROR_NAMESPACE(buffer_ptr,
 674                                                              status);
 675                                 }
 676 #else
 677                                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 678 #endif
 679                                 return_ACPI_STATUS(status);
 680                         }
 681                 }
 682
 683                 /*
 684                  * We must check to make sure that the target is
 685                  * one of the opcodes that actually opens a scope
 686                  */
 687                 switch (node->type) {
 688                 case ACPI_TYPE_ANY:
 689                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 690                 case ACPI_TYPE_DEVICE:
 691                 case ACPI_TYPE_POWER:
 692                 case ACPI_TYPE_PROCESSOR:
 693                 case ACPI_TYPE_THERMAL:
 694
 695                         /* These are acceptable types */
 696                         break;
 697
 698                 case ACPI_TYPE_INTEGER:
 699                 case ACPI_TYPE_STRING:
 700                 case ACPI_TYPE_BUFFER:
 701
 702                         /*
 703                          * These types we will allow, but we will change the type.
 704                          * This enables some existing code of the form:
 705                          *
 706                          *  Name (DEB, 0)
 707                          *  Scope (DEB) { ... }
 708                          */
 709                         ACPI_WARNING((AE_INFO,
 710                                       "Type override - [%4.4s] had invalid type (%s) "
 711                                       "for Scope operator, changed to type ANY\n",
 712                                       acpi_ut_get_node_name(node),
 713                                       acpi_ut_get_type_name(node->type)));
 714
 715                         node->type = ACPI_TYPE_ANY;
 716                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 717                         break;
 718
 719                 default:
 720
 721                         /* All other types are an error */
 722
 723                         ACPI_ERROR((AE_INFO,
 724                                     "Invalid type (%s) for target of "
 725                                     "Scope operator [%4.4s] (Cannot override)",
 726                                     acpi_ut_get_type_name(node->type),
 727                                     acpi_ut_get_node_name(node)));
 728
 729                         return (AE_AML_OPERAND_TYPE);
 730                 }
 731                 break;
 732
 733         default:
 734
 735                 /* All other opcodes */
 736
 737                 if (op && op->common.node) {
 738
 739                         /* This op/node was previously entered into the namespace */
 740
 741                         node = op->common.node;
 742
 743                         if (acpi_ns_opens_scope(object_type)) {
 744                                 status =
 745                                     acpi_ds_scope_stack_push(node, object_type,
 746                                                              walk_state);
 747                                 if (ACPI_FAILURE(status)) {
 748                                         return_ACPI_STATUS(status);
 749                                 }
 750                         }
 751
 752                         return_ACPI_STATUS(AE_OK);
 753                 }
 754
 755                 /*
 756                  * Enter the named type into the internal namespace. We enter the name
 757                  * as we go downward in the parse tree. Any necessary subobjects that
 758                  * involve arguments to the opcode must be created as we go back up the
 759                  * parse tree later.
 760                  *
 761                  * Note: Name may already exist if we are executing a deferred opcode.
 762                  */
 763                 if (walk_state->deferred_node) {
 764
 765                         /* This name is already in the namespace, get the node */
 766
 767                         node = walk_state->deferred_node;
 768                         status = AE_OK;
 769                         break;
 770                 }
 771
 772                 flags = ACPI_NS_NO_UPSEARCH;
 773                 if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {
 774
 775                         /* Execution mode, node cannot already exist, node is temporary */
 776
 777                         flags |= ACPI_NS_ERROR_IF_FOUND;
 778
 779                         if (!
 780                             (walk_state->
 781                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 782                                 flags |= ACPI_NS_TEMPORARY;
 783                         }
 784                 }
 785
 786                 /* Add new entry or lookup existing entry */
 787
 788                 status =
 789                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 790                                    object_type, ACPI_IMODE_LOAD_PASS2, flags,
 791                                    walk_state, &node);
 792
 793                 if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
 794                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 795                                           "***New Node [%4.4s] %p is temporary\n",
 796                                           acpi_ut_get_node_name(node), node));
 797                 }
 798                 break;
 799         }
 800
 801         if (ACPI_FAILURE(status)) {
 802                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 803                 return_ACPI_STATUS(status);
 804         }
 805
 806         if (!op) {
 807
 808                 /* Create a new op */
 809
 810                 op = acpi_ps_alloc_op(walk_state->opcode);
 811                 if (!op) {
 812                         return_ACPI_STATUS(AE_NO_MEMORY);
 813                 }
 814
 815                 /* Initialize the new op */
 816
 817                 if (node) {
 818                         op->named.name = node->name.integer;
 819                 }
 820                 *out_op = op;
 821         }
 822
 823         /*
 824          * Put the Node in the "op" object that the parser uses, so we
 825          * can get it again quickly when this scope is closed
 826          */
 827         op->common.node = node;
 828         return_ACPI_STATUS(status);
 829 }
 830
 831 /*******************************************************************************
 832  *
 833  * FUNCTION:    acpi_ds_load2_end_op
 834  *
 835  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 836  *
 837  * RETURN:      Status
 838  *
 839  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 840  *              both control methods and everything else.
 841  *
 842  ******************************************************************************/
 843
 844 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 845 {
 846         union acpi_parse_object *op;
 847         acpi_status status = AE_OK;
 848         acpi_object_type object_type;
 849         struct acpi_namespace_node *node;
 850         union acpi_parse_object *arg;
 851         struct acpi_namespace_node *new_node;
 852 #ifndef ACPI_NO_METHOD_EXECUTION
 853         u32 i;
 854         u8 region_space;
 855 #endif
 856
 857         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 858
 859         op = walk_state->op;
 860         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 861                           walk_state->op_info->name, op, walk_state));
 862
 863         /* Check if opcode had an associated namespace object */
 864
 865         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 866                 return_ACPI_STATUS(AE_OK);
 867         }
 868
 869         if (op->common.aml_opcode == AML_SCOPE_OP) {
 870                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 871                                   "Ending scope Op=%p State=%p\n", op,
 872                                   walk_state));
 873         }
 874
 875         object_type = walk_state->op_info->object_type;
 876
 877         /*
 878          * Get the Node/name from the earlier lookup
 879          * (It was saved in the *op structure)
 880          */
 881         node = op->common.node;
 882
 883         /*
 884          * Put the Node on the object stack (Contains the ACPI Name of
 885          * this object)
 886          */
 887         walk_state->operands[0] = (void *)node;
 888         walk_state->num_operands = 1;
 889
 890         /* Pop the scope stack */
 891
 892         if (acpi_ns_opens_scope(object_type) &&
 893             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 894                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 895                                   "(%s) Popping scope for Op %p\n",
 896                                   acpi_ut_get_type_name(object_type), op));
 897
 898                 status = acpi_ds_scope_stack_pop(walk_state);
 899                 if (ACPI_FAILURE(status)) {
 900                         goto cleanup;
 901                 }
 902         }
 903
 904         /*
 905          * Named operations are as follows:
 906          *
 907          * AML_ALIAS
 908          * AML_BANKFIELD
 909          * AML_CREATEBITFIELD
 910          * AML_CREATEBYTEFIELD
 911          * AML_CREATEDWORDFIELD
 912          * AML_CREATEFIELD
 913          * AML_CREATEQWORDFIELD
 914          * AML_CREATEWORDFIELD
 915          * AML_DATA_REGION
 916          * AML_DEVICE
 917          * AML_EVENT
 918          * AML_FIELD
 919          * AML_INDEXFIELD
 920          * AML_METHOD
 921          * AML_METHODCALL
 922          * AML_MUTEX
 923          * AML_NAME
 924          * AML_NAMEDFIELD
 925          * AML_OPREGION
 926          * AML_POWERRES
 927          * AML_PROCESSOR
 928          * AML_SCOPE
 929          * AML_THERMALZONE
 930          */
 931
 932         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 933                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 934                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 935                           walk_state, op, node));
 936
 937         /* Decode the opcode */
 938
 939         arg = op->common.value.arg;
 940
 941         switch (walk_state->op_info->type) {
 942 #ifndef ACPI_NO_METHOD_EXECUTION
 943
 944         case AML_TYPE_CREATE_FIELD:
 945                 /*
 946                  * Create the field object, but the field buffer and index must
 947                  * be evaluated later during the execution phase
 948                  */
 949                 status = acpi_ds_create_buffer_field(op, walk_state);
 950                 break;
 951
 952         case AML_TYPE_NAMED_FIELD:
 953                 /*
 954                  * If we are executing a method, initialize the field
 955                  */
 956                 if (walk_state->method_node) {
 957                         status = acpi_ds_init_field_objects(op, walk_state);
 958                 }
 959
 960                 switch (op->common.aml_opcode) {
 961                 case AML_INDEX_FIELD_OP:
 962
 963                         status =
 964                             acpi_ds_create_index_field(op,
 965                                                        (acpi_handle) arg->
 966                                                        common.node, walk_state);
 967                         break;
 968
 969                 case AML_BANK_FIELD_OP:
 970
 971                         status =
 972                             acpi_ds_create_bank_field(op, arg->common.node,
 973                                                       walk_state);
 974                         break;
 975
 976                 case AML_FIELD_OP:
 977
 978                         status =
 979                             acpi_ds_create_field(op, arg->common.node,
 980                                                  walk_state);
 981                         break;
 982
 983                 default:
 984                         /* All NAMED_FIELD opcodes must be handled above */
 985                         break;
 986                 }
 987                 break;
 988
 989         case AML_TYPE_NAMED_SIMPLE:
 990
 991                 status = acpi_ds_create_operands(walk_state, arg);
 992                 if (ACPI_FAILURE(status)) {
 993                         goto cleanup;
 994                 }
 995
 996                 switch (op->common.aml_opcode) {
 997                 case AML_PROCESSOR_OP:
 998
 999                         status = acpi_ex_create_processor(walk_state);
1000                         break;
1001
1002                 case AML_POWER_RES_OP:
1003
1004                         status = acpi_ex_create_power_resource(walk_state);
1005                         break;
1006
1007                 case AML_MUTEX_OP:
1008
1009                         status = acpi_ex_create_mutex(walk_state);
1010                         break;
1011
1012                 case AML_EVENT_OP:
1013
1014                         status = acpi_ex_create_event(walk_state);
1015                         break;
1016
1017                 case AML_ALIAS_OP:
1018
1019                         status = acpi_ex_create_alias(walk_state);
1020                         break;
1021
1022                 default:
1023                         /* Unknown opcode */
1024
1025                         status = AE_OK;
1026                         goto cleanup;
1027                 }
1028
1029                 /* Delete operands */
1030
1031                 for (i = 1; i < walk_state->num_operands; i++) {
1032                         acpi_ut_remove_reference(walk_state->operands[i]);
1033                         walk_state->operands[i] = NULL;
1034                 }
1035
1036                 break;
1037 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1038
1039         case AML_TYPE_NAMED_COMPLEX:
1040
1041                 switch (op->common.aml_opcode) {
1042 #ifndef ACPI_NO_METHOD_EXECUTION
1043                 case AML_REGION_OP:
1044                 case AML_DATA_REGION_OP:
1045
1046                         if (op->common.aml_opcode == AML_REGION_OP) {
1047                                 region_space = (acpi_adr_space_type)
1048                                     ((op->common.value.arg)->common.value.
1049                                      integer);
1050                         } else {
1051                                 region_space = REGION_DATA_TABLE;
1052                         }
1053
1054                         /*
1055                          * The op_region is not fully parsed at this time. The only valid
1056                          * argument is the space_id. (We must save the address of the
1057                          * AML of the address and length operands)
1058                          *
1059                          * If we have a valid region, initialize it. The namespace is
1060                          * unlocked at this point.
1061                          *
1062                          * Need to unlock interpreter if it is locked (if we are running
1063                          * a control method), in order to allow _REG methods to be run
1064                          * during acpi_ev_initialize_region.
1065                          */
1066                         if (walk_state->method_node) {
1067                                 /*
1068                                  * Executing a method: initialize the region and unlock
1069                                  * the interpreter
1070                                  */
1071                                 status =
1072                                     acpi_ex_create_region(op->named.data,
1073                                                           op->named.length,
1074                                                           region_space,
1075                                                           walk_state);
1076                                 if (ACPI_FAILURE(status)) {
1077                                         return (status);
1078                                 }
1079
1080                                 acpi_ex_exit_interpreter();
1081                         }
1082
1083                         status =
1084                             acpi_ev_initialize_region
1085                             (acpi_ns_get_attached_object(node), FALSE);
1086                         if (walk_state->method_node) {
1087                                 acpi_ex_enter_interpreter();
1088                         }
1089
1090                         if (ACPI_FAILURE(status)) {
1091                                 /*
1092                                  *  If AE_NOT_EXIST is returned, it is not fatal
1093                                  *  because many regions get created before a handler
1094                                  *  is installed for said region.
1095                                  */
1096                                 if (AE_NOT_EXIST == status) {
1097                                         status = AE_OK;
1098                                 }
1099                         }
1100                         break;
1101
1102                 case AML_NAME_OP:
1103
1104                         status = acpi_ds_create_node(walk_state, node, op);
1105                         break;
1106
1107                 case AML_METHOD_OP:
1108                         /*
1109                          * method_op pkg_length name_string method_flags term_list
1110                          *
1111                          * Note: We must create the method node/object pair as soon as we
1112                          * see the method declaration. This allows later pass1 parsing
1113                          * of invocations of the method (need to know the number of
1114                          * arguments.)
1115                          */
1116                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1117                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
1118                                           walk_state, op, op->named.node));
1119
1120                         if (!acpi_ns_get_attached_object(op->named.node)) {
1121                                 walk_state->operands[0] =
1122                                     ACPI_CAST_PTR(void, op->named.node);
1123                                 walk_state->num_operands = 1;
1124
1125                                 status =
1126                                     acpi_ds_create_operands(walk_state,
1127                                                             op->common.value.
1128                                                             arg);
1129                                 if (ACPI_SUCCESS(status)) {
1130                                         status =
1131                                             acpi_ex_create_method(op->named.
1132                                                                   data,
1133                                                                   op->named.
1134                                                                   length,
1135                                                                   walk_state);
1136                                 }
1137                                 walk_state->operands[0] = NULL;
1138                                 walk_state->num_operands = 0;
1139
1140                                 if (ACPI_FAILURE(status)) {
1141                                         return_ACPI_STATUS(status);
1142                                 }
1143                         }
1144                         break;
1145
1146 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1147
1148                 default:
1149                         /* All NAMED_COMPLEX opcodes must be handled above */
1150                         break;
1151                 }
1152                 break;
1153
1154         case AML_CLASS_INTERNAL:
1155
1156                 /* case AML_INT_NAMEPATH_OP: */
1157                 break;
1158
1159         case AML_CLASS_METHOD_CALL:
1160
1161                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1162                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
1163                                   walk_state, op, node));
1164
1165                 /*
1166                  * Lookup the method name and save the Node
1167                  */
1168                 status =
1169                     acpi_ns_lookup(walk_state->scope_info,
1170                                    arg->common.value.string, ACPI_TYPE_ANY,
1171                                    ACPI_IMODE_LOAD_PASS2,
1172                                    ACPI_NS_SEARCH_PARENT |
1173                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
1174                                    &(new_node));
1175                 if (ACPI_SUCCESS(status)) {
1176                         /*
1177                          * Make sure that what we found is indeed a method
1178                          * We didn't search for a method on purpose, to see if the name
1179                          * would resolve
1180                          */
1181                         if (new_node->type != ACPI_TYPE_METHOD) {
1182                                 status = AE_AML_OPERAND_TYPE;
1183                         }
1184
1185                         /* We could put the returned object (Node) on the object stack for
1186                          * later, but for now, we will put it in the "op" object that the
1187                          * parser uses, so we can get it again at the end of this scope
1188                          */
1189                         op->common.node = new_node;
1190                 } else {
1191                         ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
1192                 }
1193                 break;
1194
1195         default:
1196                 break;
1197         }
1198
1199       cleanup:
1200
1201         /* Remove the Node pushed at the very beginning */
1202
1203         walk_state->operands[0] = NULL;
1204         walk_state->num_operands = 0;
1205         return_ACPI_STATUS(status);
1206 }