drivers/acpi/dispatcher/dswload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswload - Dispatcher namespace load callbacks
   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/acinterp.h>
  49 #include <acpi/acnamesp.h>
  50 #include <acpi/acevents.h>
  51
  52 #ifdef ACPI_ASL_COMPILER
  53 #include <acpi/acdisasm.h>
  54 #endif
  55
  56 #define _COMPONENT          ACPI_DISPATCHER
  57 ACPI_MODULE_NAME("dswload")
  58
  59 /*******************************************************************************
  60  *
  61  * FUNCTION:    acpi_ds_init_callbacks
  62  *
  63  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  64  *              pass_number     - 1, 2, or 3
  65  *
  66  * RETURN:      Status
  67  *
  68  * DESCRIPTION: Init walk state callbacks
  69  *
  70  ******************************************************************************/
  71 acpi_status
  72 acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
  73 {
  74
  75         switch (pass_number) {
  76         case 1:
  77                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  78                     ACPI_PARSE_DELETE_TREE;
  79                 walk_state->descending_callback = acpi_ds_load1_begin_op;
  80                 walk_state->ascending_callback = acpi_ds_load1_end_op;
  81                 break;
  82
  83         case 2:
  84                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  85                     ACPI_PARSE_DELETE_TREE;
  86                 walk_state->descending_callback = acpi_ds_load2_begin_op;
  87                 walk_state->ascending_callback = acpi_ds_load2_end_op;
  88                 break;
  89
  90         case 3:
  91 #ifndef ACPI_NO_METHOD_EXECUTION
  92                 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
  93                     ACPI_PARSE_DELETE_TREE;
  94                 walk_state->descending_callback = acpi_ds_exec_begin_op;
  95                 walk_state->ascending_callback = acpi_ds_exec_end_op;
  96 #endif
  97                 break;
  98
  99         default:
 100                 return (AE_BAD_PARAMETER);
 101         }
 102
 103         return (AE_OK);
 104 }
 105
 106 /*******************************************************************************
 107  *
 108  * FUNCTION:    acpi_ds_load1_begin_op
 109  *
 110  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 111  *              out_op          - Where to return op if a new one is created
 112  *
 113  * RETURN:      Status
 114  *
 115  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 116  *
 117  ******************************************************************************/
 118
 119 acpi_status
 120 acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 121                        union acpi_parse_object ** out_op)
 122 {
 123         union acpi_parse_object *op;
 124         struct acpi_namespace_node *node;
 125         acpi_status status;
 126         acpi_object_type object_type;
 127         char *path;
 128         u32 flags;
 129
 130         ACPI_FUNCTION_TRACE(ds_load1_begin_op);
 131
 132         op = walk_state->op;
 133         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 134                           walk_state));
 135
 136         /* We are only interested in opcodes that have an associated name */
 137
 138         if (op) {
 139                 if (!(walk_state->op_info->flags & AML_NAMED)) {
 140                         *out_op = op;
 141                         return_ACPI_STATUS(AE_OK);
 142                 }
 143
 144                 /* Check if this object has already been installed in the namespace */
 145
 146                 if (op->common.node) {
 147                         *out_op = op;
 148                         return_ACPI_STATUS(AE_OK);
 149                 }
 150         }
 151
 152         path = acpi_ps_get_next_namestring(&walk_state->parser_state);
 153
 154         /* Map the raw opcode into an internal object type */
 155
 156         object_type = walk_state->op_info->object_type;
 157
 158         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 159                           "State=%p Op=%p [%s]\n", walk_state, op,
 160                           acpi_ut_get_type_name(object_type)));
 161
 162         switch (walk_state->opcode) {
 163         case AML_SCOPE_OP:
 164
 165                 /*
 166                  * The target name of the Scope() operator must exist at this point so
 167                  * that we can actually open the scope to enter new names underneath it.
 168                  * Allow search-to-root for single namesegs.
 169                  */
 170                 status =
 171                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 172                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 173                                    walk_state, &(node));
 174 #ifdef ACPI_ASL_COMPILER
 175                 if (status == AE_NOT_FOUND) {
 176                         /*
 177                          * Table disassembly:
 178                          * Target of Scope() not found. Generate an External for it, and
 179                          * insert the name into the namespace.
 180                          */
 181                         acpi_dm_add_to_external_list(path, ACPI_TYPE_DEVICE, 0);
 182                         status =
 183                             acpi_ns_lookup(walk_state->scope_info, path,
 184                                            object_type, ACPI_IMODE_LOAD_PASS1,
 185                                            ACPI_NS_SEARCH_PARENT, walk_state,
 186                                            &node);
 187                 }
 188 #endif
 189                 if (ACPI_FAILURE(status)) {
 190                         ACPI_ERROR_NAMESPACE(path, status);
 191                         return_ACPI_STATUS(status);
 192                 }
 193
 194                 /*
 195                  * Check to make sure that the target is
 196                  * one of the opcodes that actually opens a scope
 197                  */
 198                 switch (node->type) {
 199                 case ACPI_TYPE_ANY:
 200                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope  */
 201                 case ACPI_TYPE_DEVICE:
 202                 case ACPI_TYPE_POWER:
 203                 case ACPI_TYPE_PROCESSOR:
 204                 case ACPI_TYPE_THERMAL:
 205
 206                         /* These are acceptable types */
 207                         break;
 208
 209                 case ACPI_TYPE_INTEGER:
 210                 case ACPI_TYPE_STRING:
 211                 case ACPI_TYPE_BUFFER:
 212
 213                         /*
 214                          * These types we will allow, but we will change the type. This
 215                          * enables some existing code of the form:
 216                          *
 217                          *  Name (DEB, 0)
 218                          *  Scope (DEB) { ... }
 219                          *
 220                          * Note: silently change the type here. On the second pass, we will report
 221                          * a warning
 222                          */
 223                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 224                                           "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)\n",
 225                                           path,
 226                                           acpi_ut_get_type_name(node->type)));
 227
 228                         node->type = ACPI_TYPE_ANY;
 229                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 230                         break;
 231
 232                 default:
 233
 234                         /* All other types are an error */
 235
 236                         ACPI_ERROR((AE_INFO,
 237                                     "Invalid type (%s) for target of Scope operator [%4.4s] (Cannot override)",
 238                                     acpi_ut_get_type_name(node->type), path));
 239
 240                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 241                 }
 242                 break;
 243
 244         default:
 245                 /*
 246                  * For all other named opcodes, we will enter the name into
 247                  * the namespace.
 248                  *
 249                  * Setup the search flags.
 250                  * Since we are entering a name into the namespace, we do not want to
 251                  * enable the search-to-root upsearch.
 252                  *
 253                  * There are only two conditions where it is acceptable that the name
 254                  * already exists:
 255                  *    1) the Scope() operator can reopen a scoping object that was
 256                  *       previously defined (Scope, Method, Device, etc.)
 257                  *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
 258                  *       buffer_field, or Package), the name of the object is already
 259                  *       in the namespace.
 260                  */
 261                 if (walk_state->deferred_node) {
 262
 263                         /* This name is already in the namespace, get the node */
 264
 265                         node = walk_state->deferred_node;
 266                         status = AE_OK;
 267                         break;
 268                 }
 269
 270                 /*
 271                  * If we are executing a method, do not create any namespace objects
 272                  * during the load phase, only during execution.
 273                  */
 274                 if (walk_state->method_node) {
 275                         node = NULL;
 276                         status = AE_OK;
 277                         break;
 278                 }
 279
 280                 flags = ACPI_NS_NO_UPSEARCH;
 281                 if ((walk_state->opcode != AML_SCOPE_OP) &&
 282                     (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
 283                         flags |= ACPI_NS_ERROR_IF_FOUND;
 284                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 285                                           "[%s] Cannot already exist\n",
 286                                           acpi_ut_get_type_name(object_type)));
 287                 } else {
 288                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 289                                           "[%s] Both Find or Create allowed\n",
 290                                           acpi_ut_get_type_name(object_type)));
 291                 }
 292
 293                 /*
 294                  * Enter the named type into the internal namespace. We enter the name
 295                  * as we go downward in the parse tree. Any necessary subobjects that
 296                  * involve arguments to the opcode must be created as we go back up the
 297                  * parse tree later.
 298                  */
 299                 status =
 300                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 301                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
 302                                    &node);
 303                 if (ACPI_FAILURE(status)) {
 304                         if (status == AE_ALREADY_EXISTS) {
 305
 306                                 /* The name already exists in this scope */
 307
 308                                 if (node->flags & ANOBJ_IS_EXTERNAL) {
 309                                         /*
 310                                          * Allow one create on an object or segment that was
 311                                          * previously declared External
 312                                          */
 313                                         node->flags &= ~ANOBJ_IS_EXTERNAL;
 314                                         node->type = (u8) object_type;
 315
 316                                         /* Just retyped a node, probably will need to open a scope */
 317
 318                                         if (acpi_ns_opens_scope(object_type)) {
 319                                                 status =
 320                                                     acpi_ds_scope_stack_push
 321                                                     (node, object_type,
 322                                                      walk_state);
 323                                                 if (ACPI_FAILURE(status)) {
 324                                                         return_ACPI_STATUS
 325                                                             (status);
 326                                                 }
 327                                         }
 328
 329                                         status = AE_OK;
 330                                 }
 331                         }
 332
 333                         if (ACPI_FAILURE(status)) {
 334                                 ACPI_ERROR_NAMESPACE(path, status);
 335                                 return_ACPI_STATUS(status);
 336                         }
 337                 }
 338                 break;
 339         }
 340
 341         /* Common exit */
 342
 343         if (!op) {
 344
 345                 /* Create a new op */
 346
 347                 op = acpi_ps_alloc_op(walk_state->opcode);
 348                 if (!op) {
 349                         return_ACPI_STATUS(AE_NO_MEMORY);
 350                 }
 351         }
 352
 353         /* Initialize the op */
 354
 355 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
 356         op->named.path = ACPI_CAST_PTR(u8, path);
 357 #endif
 358
 359         if (node) {
 360                 /*
 361                  * Put the Node in the "op" object that the parser uses, so we
 362                  * can get it again quickly when this scope is closed
 363                  */
 364                 op->common.node = node;
 365                 op->named.name = node->name.integer;
 366         }
 367
 368         acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
 369                            op);
 370         *out_op = op;
 371         return_ACPI_STATUS(status);
 372 }
 373
 374 /*******************************************************************************
 375  *
 376  * FUNCTION:    acpi_ds_load1_end_op
 377  *
 378  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 379  *
 380  * RETURN:      Status
 381  *
 382  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 383  *              both control methods and everything else.
 384  *
 385  ******************************************************************************/
 386
 387 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 388 {
 389         union acpi_parse_object *op;
 390         acpi_object_type object_type;
 391         acpi_status status = AE_OK;
 392
 393         ACPI_FUNCTION_TRACE(ds_load1_end_op);
 394
 395         op = walk_state->op;
 396         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 397                           walk_state));
 398
 399         /* We are only interested in opcodes that have an associated name */
 400
 401         if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
 402                 return_ACPI_STATUS(AE_OK);
 403         }
 404
 405         /* Get the object type to determine if we should pop the scope */
 406
 407         object_type = walk_state->op_info->object_type;
 408
 409 #ifndef ACPI_NO_METHOD_EXECUTION
 410         if (walk_state->op_info->flags & AML_FIELD) {
 411                 /*
 412                  * If we are executing a method, do not create any namespace objects
 413                  * during the load phase, only during execution.
 414                  */
 415                 if (!walk_state->method_node) {
 416                         if (walk_state->opcode == AML_FIELD_OP ||
 417                             walk_state->opcode == AML_BANK_FIELD_OP ||
 418                             walk_state->opcode == AML_INDEX_FIELD_OP) {
 419                                 status =
 420                                     acpi_ds_init_field_objects(op, walk_state);
 421                         }
 422                 }
 423                 return_ACPI_STATUS(status);
 424         }
 425
 426         /*
 427          * If we are executing a method, do not create any namespace objects
 428          * during the load phase, only during execution.
 429          */
 430         if (!walk_state->method_node) {
 431                 if (op->common.aml_opcode == AML_REGION_OP) {
 432                         status =
 433                             acpi_ex_create_region(op->named.data,
 434                                                   op->named.length,
 435                                                   (acpi_adr_space_type) ((op->
 436                                                                           common.
 437                                                                           value.
 438                                                                           arg)->
 439                                                                          common.
 440                                                                          value.
 441                                                                          integer),
 442                                                   walk_state);
 443                         if (ACPI_FAILURE(status)) {
 444                                 return_ACPI_STATUS(status);
 445                         }
 446                 }
 447         }
 448 #endif
 449
 450         if (op->common.aml_opcode == AML_NAME_OP) {
 451
 452                 /* For Name opcode, get the object type from the argument */
 453
 454                 if (op->common.value.arg) {
 455                         object_type = (acpi_ps_get_opcode_info((op->common.
 456                                                                 value.arg)->
 457                                                                common.
 458                                                                aml_opcode))->
 459                             object_type;
 460
 461                         /* Set node type if we have a namespace node */
 462
 463                         if (op->common.node) {
 464                                 op->common.node->type = (u8) object_type;
 465                         }
 466                 }
 467         }
 468
 469         /*
 470          * If we are executing a method, do not create any namespace objects
 471          * during the load phase, only during execution.
 472          */
 473         if (!walk_state->method_node) {
 474                 if (op->common.aml_opcode == AML_METHOD_OP) {
 475                         /*
 476                          * method_op pkg_length name_string method_flags term_list
 477                          *
 478                          * Note: We must create the method node/object pair as soon as we
 479                          * see the method declaration. This allows later pass1 parsing
 480                          * of invocations of the method (need to know the number of
 481                          * arguments.)
 482                          */
 483                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 484                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 485                                           walk_state, op, op->named.node));
 486
 487                         if (!acpi_ns_get_attached_object(op->named.node)) {
 488                                 walk_state->operands[0] =
 489                                     ACPI_CAST_PTR(void, op->named.node);
 490                                 walk_state->num_operands = 1;
 491
 492                                 status =
 493                                     acpi_ds_create_operands(walk_state,
 494                                                             op->common.value.
 495                                                             arg);
 496                                 if (ACPI_SUCCESS(status)) {
 497                                         status =
 498                                             acpi_ex_create_method(op->named.
 499                                                                   data,
 500                                                                   op->named.
 501                                                                   length,
 502                                                                   walk_state);
 503                                 }
 504
 505                                 walk_state->operands[0] = NULL;
 506                                 walk_state->num_operands = 0;
 507
 508                                 if (ACPI_FAILURE(status)) {
 509                                         return_ACPI_STATUS(status);
 510                                 }
 511                         }
 512                 }
 513         }
 514
 515         /* Pop the scope stack (only if loading a table) */
 516
 517         if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
 518                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 519                                   "(%s): Popping scope for Op %p\n",
 520                                   acpi_ut_get_type_name(object_type), op));
 521
 522                 status = acpi_ds_scope_stack_pop(walk_state);
 523         }
 524
 525         return_ACPI_STATUS(status);
 526 }
 527
 528 /*******************************************************************************
 529  *
 530  * FUNCTION:    acpi_ds_load2_begin_op
 531  *
 532  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 533  *              out_op          - Wher to return op if a new one is created
 534  *
 535  * RETURN:      Status
 536  *
 537  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 538  *
 539  ******************************************************************************/
 540
 541 acpi_status
 542 acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 543                        union acpi_parse_object **out_op)
 544 {
 545         union acpi_parse_object *op;
 546         struct acpi_namespace_node *node;
 547         acpi_status status;
 548         acpi_object_type object_type;
 549         char *buffer_ptr;
 550         u32 flags;
 551
 552         ACPI_FUNCTION_TRACE(ds_load2_begin_op);
 553
 554         op = walk_state->op;
 555         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 556                           walk_state));
 557
 558         if (op) {
 559                 if ((walk_state->control_state) &&
 560                     (walk_state->control_state->common.state ==
 561                      ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 562
 563                         /* We are executing a while loop outside of a method */
 564
 565                         status = acpi_ds_exec_begin_op(walk_state, out_op);
 566                         return_ACPI_STATUS(status);
 567                 }
 568
 569                 /* We only care about Namespace opcodes here */
 570
 571                 if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
 572                      (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
 573                     (!(walk_state->op_info->flags & AML_NAMED))) {
 574 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 575                         if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 576                             (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 577                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 578                                                   "Begin/EXEC: %s (fl %8.8X)\n",
 579                                                   walk_state->op_info->name,
 580                                                   walk_state->op_info->flags));
 581
 582                                 /* Executing a type1 or type2 opcode outside of a method */
 583
 584                                 status =
 585                                     acpi_ds_exec_begin_op(walk_state, out_op);
 586                                 return_ACPI_STATUS(status);
 587                         }
 588 #endif
 589                         return_ACPI_STATUS(AE_OK);
 590                 }
 591
 592                 /* Get the name we are going to enter or lookup in the namespace */
 593
 594                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 595
 596                         /* For Namepath op, get the path string */
 597
 598                         buffer_ptr = op->common.value.string;
 599                         if (!buffer_ptr) {
 600
 601                                 /* No name, just exit */
 602
 603                                 return_ACPI_STATUS(AE_OK);
 604                         }
 605                 } else {
 606                         /* Get name from the op */
 607
 608                         buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
 609                 }
 610         } else {
 611                 /* Get the namestring from the raw AML */
 612
 613                 buffer_ptr =
 614                     acpi_ps_get_next_namestring(&walk_state->parser_state);
 615         }
 616
 617         /* Map the opcode into an internal object type */
 618
 619         object_type = walk_state->op_info->object_type;
 620
 621         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 622                           "State=%p Op=%p Type=%X\n", walk_state, op,
 623                           object_type));
 624
 625         switch (walk_state->opcode) {
 626         case AML_FIELD_OP:
 627         case AML_BANK_FIELD_OP:
 628         case AML_INDEX_FIELD_OP:
 629
 630                 node = NULL;
 631                 status = AE_OK;
 632                 break;
 633
 634         case AML_INT_NAMEPATH_OP:
 635                 /*
 636                  * The name_path is an object reference to an existing object.
 637                  * Don't enter the name into the namespace, but look it up
 638                  * for use later.
 639                  */
 640                 status =
 641                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 642                                    object_type, ACPI_IMODE_EXECUTE,
 643                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 644                 break;
 645
 646         case AML_SCOPE_OP:
 647                 /*
 648                  * The Path is an object reference to an existing object.
 649                  * Don't enter the name into the namespace, but look it up
 650                  * for use later.
 651                  */
 652                 status =
 653                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 654                                    object_type, ACPI_IMODE_EXECUTE,
 655                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 656                 if (ACPI_FAILURE(status)) {
 657 #ifdef ACPI_ASL_COMPILER
 658                         if (status == AE_NOT_FOUND) {
 659                                 status = AE_OK;
 660                         } else {
 661                                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 662                         }
 663 #else
 664                         ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 665 #endif
 666                         return_ACPI_STATUS(status);
 667                 }
 668
 669                 /*
 670                  * We must check to make sure that the target is
 671                  * one of the opcodes that actually opens a scope
 672                  */
 673                 switch (node->type) {
 674                 case ACPI_TYPE_ANY:
 675                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 676                 case ACPI_TYPE_DEVICE:
 677                 case ACPI_TYPE_POWER:
 678                 case ACPI_TYPE_PROCESSOR:
 679                 case ACPI_TYPE_THERMAL:
 680
 681                         /* These are acceptable types */
 682                         break;
 683
 684                 case ACPI_TYPE_INTEGER:
 685                 case ACPI_TYPE_STRING:
 686                 case ACPI_TYPE_BUFFER:
 687
 688                         /*
 689                          * These types we will allow, but we will change the type. This
 690                          * enables some existing code of the form:
 691                          *
 692                          *  Name (DEB, 0)
 693                          *  Scope (DEB) { ... }
 694                          */
 695                         ACPI_WARNING((AE_INFO,
 696                                       "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)",
 697                                       buffer_ptr,
 698                                       acpi_ut_get_type_name(node->type)));
 699
 700                         node->type = ACPI_TYPE_ANY;
 701                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 702                         break;
 703
 704                 default:
 705
 706                         /* All other types are an error */
 707
 708                         ACPI_ERROR((AE_INFO,
 709                                     "Invalid type (%s) for target of Scope operator [%4.4s]",
 710                                     acpi_ut_get_type_name(node->type),
 711                                     buffer_ptr));
 712
 713                         return (AE_AML_OPERAND_TYPE);
 714                 }
 715                 break;
 716
 717         default:
 718
 719                 /* All other opcodes */
 720
 721                 if (op && op->common.node) {
 722
 723                         /* This op/node was previously entered into the namespace */
 724
 725                         node = op->common.node;
 726
 727                         if (acpi_ns_opens_scope(object_type)) {
 728                                 status =
 729                                     acpi_ds_scope_stack_push(node, object_type,
 730                                                              walk_state);
 731                                 if (ACPI_FAILURE(status)) {
 732                                         return_ACPI_STATUS(status);
 733                                 }
 734                         }
 735
 736                         return_ACPI_STATUS(AE_OK);
 737                 }
 738
 739                 /*
 740                  * Enter the named type into the internal namespace. We enter the name
 741                  * as we go downward in the parse tree. Any necessary subobjects that
 742                  * involve arguments to the opcode must be created as we go back up the
 743                  * parse tree later.
 744                  *
 745                  * Note: Name may already exist if we are executing a deferred opcode.
 746                  */
 747                 if (walk_state->deferred_node) {
 748
 749                         /* This name is already in the namespace, get the node */
 750
 751                         node = walk_state->deferred_node;
 752                         status = AE_OK;
 753                         break;
 754                 }
 755
 756                 flags = ACPI_NS_NO_UPSEARCH;
 757                 if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {
 758
 759                         /* Execution mode, node cannot already exist, node is temporary */
 760
 761                         flags |= (ACPI_NS_ERROR_IF_FOUND | ACPI_NS_TEMPORARY);
 762                 }
 763
 764                 /* Add new entry or lookup existing entry */
 765
 766                 status =
 767                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 768                                    object_type, ACPI_IMODE_LOAD_PASS2, flags,
 769                                    walk_state, &node);
 770                 break;
 771         }
 772
 773         if (ACPI_FAILURE(status)) {
 774                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 775                 return_ACPI_STATUS(status);
 776         }
 777
 778         if (!op) {
 779
 780                 /* Create a new op */
 781
 782                 op = acpi_ps_alloc_op(walk_state->opcode);
 783                 if (!op) {
 784                         return_ACPI_STATUS(AE_NO_MEMORY);
 785                 }
 786
 787                 /* Initialize the new op */
 788
 789                 if (node) {
 790                         op->named.name = node->name.integer;
 791                 }
 792                 *out_op = op;
 793         }
 794
 795         /*
 796          * Put the Node in the "op" object that the parser uses, so we
 797          * can get it again quickly when this scope is closed
 798          */
 799         op->common.node = node;
 800         return_ACPI_STATUS(status);
 801 }
 802
 803 /*******************************************************************************
 804  *
 805  * FUNCTION:    acpi_ds_load2_end_op
 806  *
 807  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 808  *
 809  * RETURN:      Status
 810  *
 811  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 812  *              both control methods and everything else.
 813  *
 814  ******************************************************************************/
 815
 816 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 817 {
 818         union acpi_parse_object *op;
 819         acpi_status status = AE_OK;
 820         acpi_object_type object_type;
 821         struct acpi_namespace_node *node;
 822         union acpi_parse_object *arg;
 823         struct acpi_namespace_node *new_node;
 824 #ifndef ACPI_NO_METHOD_EXECUTION
 825         u32 i;
 826 #endif
 827
 828         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 829
 830         op = walk_state->op;
 831         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 832                           walk_state->op_info->name, op, walk_state));
 833
 834         /* Check if opcode had an associated namespace object */
 835
 836         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 837 #ifndef ACPI_NO_METHOD_EXECUTION
 838 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 839                 /* No namespace object. Executable opcode? */
 840
 841                 if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 842                     (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 843                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 844                                           "End/EXEC:   %s (fl %8.8X)\n",
 845                                           walk_state->op_info->name,
 846                                           walk_state->op_info->flags));
 847
 848                         /* Executing a type1 or type2 opcode outside of a method */
 849
 850                         status = acpi_ds_exec_end_op(walk_state);
 851                         return_ACPI_STATUS(status);
 852                 }
 853 #endif
 854 #endif
 855                 return_ACPI_STATUS(AE_OK);
 856         }
 857
 858         if (op->common.aml_opcode == AML_SCOPE_OP) {
 859                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 860                                   "Ending scope Op=%p State=%p\n", op,
 861                                   walk_state));
 862         }
 863
 864         object_type = walk_state->op_info->object_type;
 865
 866         /*
 867          * Get the Node/name from the earlier lookup
 868          * (It was saved in the *op structure)
 869          */
 870         node = op->common.node;
 871
 872         /*
 873          * Put the Node on the object stack (Contains the ACPI Name of
 874          * this object)
 875          */
 876         walk_state->operands[0] = (void *)node;
 877         walk_state->num_operands = 1;
 878
 879         /* Pop the scope stack */
 880
 881         if (acpi_ns_opens_scope(object_type) &&
 882             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 883                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 884                                   "(%s) Popping scope for Op %p\n",
 885                                   acpi_ut_get_type_name(object_type), op));
 886
 887                 status = acpi_ds_scope_stack_pop(walk_state);
 888                 if (ACPI_FAILURE(status)) {
 889                         goto cleanup;
 890                 }
 891         }
 892
 893         /*
 894          * Named operations are as follows:
 895          *
 896          * AML_ALIAS
 897          * AML_BANKFIELD
 898          * AML_CREATEBITFIELD
 899          * AML_CREATEBYTEFIELD
 900          * AML_CREATEDWORDFIELD
 901          * AML_CREATEFIELD
 902          * AML_CREATEQWORDFIELD
 903          * AML_CREATEWORDFIELD
 904          * AML_DATA_REGION
 905          * AML_DEVICE
 906          * AML_EVENT
 907          * AML_FIELD
 908          * AML_INDEXFIELD
 909          * AML_METHOD
 910          * AML_METHODCALL
 911          * AML_MUTEX
 912          * AML_NAME
 913          * AML_NAMEDFIELD
 914          * AML_OPREGION
 915          * AML_POWERRES
 916          * AML_PROCESSOR
 917          * AML_SCOPE
 918          * AML_THERMALZONE
 919          */
 920
 921         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 922                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 923                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 924                           walk_state, op, node));
 925
 926         /* Decode the opcode */
 927
 928         arg = op->common.value.arg;
 929
 930         switch (walk_state->op_info->type) {
 931 #ifndef ACPI_NO_METHOD_EXECUTION
 932
 933         case AML_TYPE_CREATE_FIELD:
 934                 /*
 935                  * Create the field object, but the field buffer and index must
 936                  * be evaluated later during the execution phase
 937                  */
 938                 status = acpi_ds_create_buffer_field(op, walk_state);
 939                 break;
 940
 941         case AML_TYPE_NAMED_FIELD:
 942                 /*
 943                  * If we are executing a method, initialize the field
 944                  */
 945                 if (walk_state->method_node) {
 946                         status = acpi_ds_init_field_objects(op, walk_state);
 947                 }
 948
 949                 switch (op->common.aml_opcode) {
 950                 case AML_INDEX_FIELD_OP:
 951
 952                         status =
 953                             acpi_ds_create_index_field(op,
 954                                                        (acpi_handle) arg->
 955                                                        common.node, walk_state);
 956                         break;
 957
 958                 case AML_BANK_FIELD_OP:
 959
 960                         status =
 961                             acpi_ds_create_bank_field(op, arg->common.node,
 962                                                       walk_state);
 963                         break;
 964
 965                 case AML_FIELD_OP:
 966
 967                         status =
 968                             acpi_ds_create_field(op, arg->common.node,
 969                                                  walk_state);
 970                         break;
 971
 972                 default:
 973                         /* All NAMED_FIELD opcodes must be handled above */
 974                         break;
 975                 }
 976                 break;
 977
 978         case AML_TYPE_NAMED_SIMPLE:
 979
 980                 status = acpi_ds_create_operands(walk_state, arg);
 981                 if (ACPI_FAILURE(status)) {
 982                         goto cleanup;
 983                 }
 984
 985                 switch (op->common.aml_opcode) {
 986                 case AML_PROCESSOR_OP:
 987
 988                         status = acpi_ex_create_processor(walk_state);
 989                         break;
 990
 991                 case AML_POWER_RES_OP:
 992
 993                         status = acpi_ex_create_power_resource(walk_state);
 994                         break;
 995
 996                 case AML_MUTEX_OP:
 997
 998                         status = acpi_ex_create_mutex(walk_state);
 999                         break;
1000
1001                 case AML_EVENT_OP:
1002
1003                         status = acpi_ex_create_event(walk_state);
1004                         break;
1005
1006                 case AML_DATA_REGION_OP:
1007
1008                         status = acpi_ex_create_table_region(walk_state);
1009                         break;
1010
1011                 case AML_ALIAS_OP:
1012
1013                         status = acpi_ex_create_alias(walk_state);
1014                         break;
1015
1016                 default:
1017                         /* Unknown opcode */
1018
1019                         status = AE_OK;
1020                         goto cleanup;
1021                 }
1022
1023                 /* Delete operands */
1024
1025                 for (i = 1; i < walk_state->num_operands; i++) {
1026                         acpi_ut_remove_reference(walk_state->operands[i]);
1027                         walk_state->operands[i] = NULL;
1028                 }
1029
1030                 break;
1031 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1032
1033         case AML_TYPE_NAMED_COMPLEX:
1034
1035                 switch (op->common.aml_opcode) {
1036 #ifndef ACPI_NO_METHOD_EXECUTION
1037                 case AML_REGION_OP:
1038
1039                         /*
1040                          * If we are executing a method, initialize the region
1041                          */
1042                         if (walk_state->method_node) {
1043                                 status =
1044                                     acpi_ex_create_region(op->named.data,
1045                                                           op->named.length,
1046                                                           (acpi_adr_space_type)
1047                                                           ((op->common.value.
1048                                                             arg)->common.value.
1049                                                            integer),
1050                                                           walk_state);
1051                                 if (ACPI_FAILURE(status)) {
1052                                         return (status);
1053                                 }
1054                         }
1055
1056                         /*
1057                          * The op_region is not fully parsed at this time. Only valid
1058                          * argument is the space_id. (We must save the address of the
1059                          * AML of the address and length operands)
1060                          */
1061
1062                         /*
1063                          * If we have a valid region, initialize it
1064                          * Namespace is NOT locked at this point.
1065                          */
1066                         status =
1067                             acpi_ev_initialize_region
1068                             (acpi_ns_get_attached_object(node), FALSE);
1069                         if (ACPI_FAILURE(status)) {
1070                                 /*
1071                                  *  If AE_NOT_EXIST is returned, it is not fatal
1072                                  *  because many regions get created before a handler
1073                                  *  is installed for said region.
1074                                  */
1075                                 if (AE_NOT_EXIST == status) {
1076                                         status = AE_OK;
1077                                 }
1078                         }
1079                         break;
1080
1081                 case AML_NAME_OP:
1082
1083                         status = acpi_ds_create_node(walk_state, node, op);
1084                         break;
1085
1086                 case AML_METHOD_OP:
1087                         /*
1088                          * method_op pkg_length name_string method_flags term_list
1089                          *
1090                          * Note: We must create the method node/object pair as soon as we
1091                          * see the method declaration. This allows later pass1 parsing
1092                          * of invocations of the method (need to know the number of
1093                          * arguments.)
1094                          */
1095                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1096                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
1097                                           walk_state, op, op->named.node));
1098
1099                         if (!acpi_ns_get_attached_object(op->named.node)) {
1100                                 walk_state->operands[0] =
1101                                     ACPI_CAST_PTR(void, op->named.node);
1102                                 walk_state->num_operands = 1;
1103
1104                                 status =
1105                                     acpi_ds_create_operands(walk_state,
1106                                                             op->common.value.
1107                                                             arg);
1108                                 if (ACPI_SUCCESS(status)) {
1109                                         status =
1110                                             acpi_ex_create_method(op->named.
1111                                                                   data,
1112                                                                   op->named.
1113                                                                   length,
1114                                                                   walk_state);
1115                                 }
1116                                 walk_state->operands[0] = NULL;
1117                                 walk_state->num_operands = 0;
1118
1119                                 if (ACPI_FAILURE(status)) {
1120                                         return_ACPI_STATUS(status);
1121                                 }
1122                         }
1123                         break;
1124
1125 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1126
1127                 default:
1128                         /* All NAMED_COMPLEX opcodes must be handled above */
1129                         break;
1130                 }
1131                 break;
1132
1133         case AML_CLASS_INTERNAL:
1134
1135                 /* case AML_INT_NAMEPATH_OP: */
1136                 break;
1137
1138         case AML_CLASS_METHOD_CALL:
1139
1140                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1141                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
1142                                   walk_state, op, node));
1143
1144                 /*
1145                  * Lookup the method name and save the Node
1146                  */
1147                 status =
1148                     acpi_ns_lookup(walk_state->scope_info,
1149                                    arg->common.value.string, ACPI_TYPE_ANY,
1150                                    ACPI_IMODE_LOAD_PASS2,
1151                                    ACPI_NS_SEARCH_PARENT |
1152                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
1153                                    &(new_node));
1154                 if (ACPI_SUCCESS(status)) {
1155                         /*
1156                          * Make sure that what we found is indeed a method
1157                          * We didn't search for a method on purpose, to see if the name
1158                          * would resolve
1159                          */
1160                         if (new_node->type != ACPI_TYPE_METHOD) {
1161                                 status = AE_AML_OPERAND_TYPE;
1162                         }
1163
1164                         /* We could put the returned object (Node) on the object stack for
1165                          * later, but for now, we will put it in the "op" object that the
1166                          * parser uses, so we can get it again at the end of this scope
1167                          */
1168                         op->common.node = new_node;
1169                 } else {
1170                         ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
1171                 }
1172                 break;
1173
1174         default:
1175                 break;
1176         }
1177
1178       cleanup:
1179
1180         /* Remove the Node pushed at the very beginning */
1181
1182         walk_state->operands[0] = NULL;
1183         walk_state->num_operands = 0;
1184         return_ACPI_STATUS(status);
1185 }