drivers/acpi/dispatcher/dswload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswload - Dispatcher namespace load callbacks
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, 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
 551         ACPI_FUNCTION_TRACE(ds_load2_begin_op);
 552
 553         op = walk_state->op;
 554         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 555                           walk_state));
 556
 557         if (op) {
 558                 if ((walk_state->control_state) &&
 559                     (walk_state->control_state->common.state ==
 560                      ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 561
 562                         /* We are executing a while loop outside of a method */
 563
 564                         status = acpi_ds_exec_begin_op(walk_state, out_op);
 565                         return_ACPI_STATUS(status);
 566                 }
 567
 568                 /* We only care about Namespace opcodes here */
 569
 570                 if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
 571                      (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
 572                     (!(walk_state->op_info->flags & AML_NAMED))) {
 573 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 574                         if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 575                             (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 576                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 577                                                   "Begin/EXEC: %s (fl %8.8X)\n",
 578                                                   walk_state->op_info->name,
 579                                                   walk_state->op_info->flags));
 580
 581                                 /* Executing a type1 or type2 opcode outside of a method */
 582
 583                                 status =
 584                                     acpi_ds_exec_begin_op(walk_state, out_op);
 585                                 return_ACPI_STATUS(status);
 586                         }
 587 #endif
 588                         return_ACPI_STATUS(AE_OK);
 589                 }
 590
 591                 /* Get the name we are going to enter or lookup in the namespace */
 592
 593                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 594
 595                         /* For Namepath op, get the path string */
 596
 597                         buffer_ptr = op->common.value.string;
 598                         if (!buffer_ptr) {
 599
 600                                 /* No name, just exit */
 601
 602                                 return_ACPI_STATUS(AE_OK);
 603                         }
 604                 } else {
 605                         /* Get name from the op */
 606
 607                         buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
 608                 }
 609         } else {
 610                 /* Get the namestring from the raw AML */
 611
 612                 buffer_ptr =
 613                     acpi_ps_get_next_namestring(&walk_state->parser_state);
 614         }
 615
 616         /* Map the opcode into an internal object type */
 617
 618         object_type = walk_state->op_info->object_type;
 619
 620         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 621                           "State=%p Op=%p Type=%X\n", walk_state, op,
 622                           object_type));
 623
 624         switch (walk_state->opcode) {
 625         case AML_FIELD_OP:
 626         case AML_BANK_FIELD_OP:
 627         case AML_INDEX_FIELD_OP:
 628
 629                 node = NULL;
 630                 status = AE_OK;
 631                 break;
 632
 633         case AML_INT_NAMEPATH_OP:
 634                 /*
 635                  * The name_path is an object reference to an existing object.
 636                  * Don't enter the name into the namespace, but look it up
 637                  * for use later.
 638                  */
 639                 status =
 640                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 641                                    object_type, ACPI_IMODE_EXECUTE,
 642                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 643                 break;
 644
 645         case AML_SCOPE_OP:
 646                 /*
 647                  * The Path is an object reference to an existing object.
 648                  * Don't enter the name into the namespace, but look it up
 649                  * for use later.
 650                  */
 651                 status =
 652                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 653                                    object_type, ACPI_IMODE_EXECUTE,
 654                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 655                 if (ACPI_FAILURE(status)) {
 656 #ifdef ACPI_ASL_COMPILER
 657                         if (status == AE_NOT_FOUND) {
 658                                 status = AE_OK;
 659                         } else {
 660                                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 661                         }
 662 #else
 663                         ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 664 #endif
 665                         return_ACPI_STATUS(status);
 666                 }
 667
 668                 /*
 669                  * We must check to make sure that the target is
 670                  * one of the opcodes that actually opens a scope
 671                  */
 672                 switch (node->type) {
 673                 case ACPI_TYPE_ANY:
 674                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 675                 case ACPI_TYPE_DEVICE:
 676                 case ACPI_TYPE_POWER:
 677                 case ACPI_TYPE_PROCESSOR:
 678                 case ACPI_TYPE_THERMAL:
 679
 680                         /* These are acceptable types */
 681                         break;
 682
 683                 case ACPI_TYPE_INTEGER:
 684                 case ACPI_TYPE_STRING:
 685                 case ACPI_TYPE_BUFFER:
 686
 687                         /*
 688                          * These types we will allow, but we will change the type. This
 689                          * enables some existing code of the form:
 690                          *
 691                          *  Name (DEB, 0)
 692                          *  Scope (DEB) { ... }
 693                          */
 694                         ACPI_WARNING((AE_INFO,
 695                                       "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)",
 696                                       buffer_ptr,
 697                                       acpi_ut_get_type_name(node->type)));
 698
 699                         node->type = ACPI_TYPE_ANY;
 700                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 701                         break;
 702
 703                 default:
 704
 705                         /* All other types are an error */
 706
 707                         ACPI_ERROR((AE_INFO,
 708                                     "Invalid type (%s) for target of Scope operator [%4.4s]",
 709                                     acpi_ut_get_type_name(node->type),
 710                                     buffer_ptr));
 711
 712                         return (AE_AML_OPERAND_TYPE);
 713                 }
 714                 break;
 715
 716         default:
 717
 718                 /* All other opcodes */
 719
 720                 if (op && op->common.node) {
 721
 722                         /* This op/node was previously entered into the namespace */
 723
 724                         node = op->common.node;
 725
 726                         if (acpi_ns_opens_scope(object_type)) {
 727                                 status =
 728                                     acpi_ds_scope_stack_push(node, object_type,
 729                                                              walk_state);
 730                                 if (ACPI_FAILURE(status)) {
 731                                         return_ACPI_STATUS(status);
 732                                 }
 733                         }
 734
 735                         return_ACPI_STATUS(AE_OK);
 736                 }
 737
 738                 /*
 739                  * Enter the named type into the internal namespace. We enter the name
 740                  * as we go downward in the parse tree. Any necessary subobjects that
 741                  * involve arguments to the opcode must be created as we go back up the
 742                  * parse tree later.
 743                  *
 744                  * Note: Name may already exist if we are executing a deferred opcode.
 745                  */
 746                 if (walk_state->deferred_node) {
 747
 748                         /* This name is already in the namespace, get the node */
 749
 750                         node = walk_state->deferred_node;
 751                         status = AE_OK;
 752                         break;
 753                 }
 754
 755                 /* Add new entry into namespace */
 756
 757                 status =
 758                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 759                                    object_type, ACPI_IMODE_LOAD_PASS2,
 760                                    ACPI_NS_NO_UPSEARCH, walk_state, &(node));
 761                 break;
 762         }
 763
 764         if (ACPI_FAILURE(status)) {
 765                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 766                 return_ACPI_STATUS(status);
 767         }
 768
 769         if (!op) {
 770
 771                 /* Create a new op */
 772
 773                 op = acpi_ps_alloc_op(walk_state->opcode);
 774                 if (!op) {
 775                         return_ACPI_STATUS(AE_NO_MEMORY);
 776                 }
 777
 778                 /* Initialize the new op */
 779
 780                 if (node) {
 781                         op->named.name = node->name.integer;
 782                 }
 783                 *out_op = op;
 784         }
 785
 786         /*
 787          * Put the Node in the "op" object that the parser uses, so we
 788          * can get it again quickly when this scope is closed
 789          */
 790         op->common.node = node;
 791         return_ACPI_STATUS(status);
 792 }
 793
 794 /*******************************************************************************
 795  *
 796  * FUNCTION:    acpi_ds_load2_end_op
 797  *
 798  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 799  *
 800  * RETURN:      Status
 801  *
 802  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 803  *              both control methods and everything else.
 804  *
 805  ******************************************************************************/
 806
 807 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 808 {
 809         union acpi_parse_object *op;
 810         acpi_status status = AE_OK;
 811         acpi_object_type object_type;
 812         struct acpi_namespace_node *node;
 813         union acpi_parse_object *arg;
 814         struct acpi_namespace_node *new_node;
 815 #ifndef ACPI_NO_METHOD_EXECUTION
 816         u32 i;
 817 #endif
 818
 819         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 820
 821         op = walk_state->op;
 822         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 823                           walk_state->op_info->name, op, walk_state));
 824
 825         /* Check if opcode had an associated namespace object */
 826
 827         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 828 #ifndef ACPI_NO_METHOD_EXECUTION
 829 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 830                 /* No namespace object. Executable opcode? */
 831
 832                 if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 833                     (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 834                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 835                                           "End/EXEC:   %s (fl %8.8X)\n",
 836                                           walk_state->op_info->name,
 837                                           walk_state->op_info->flags));
 838
 839                         /* Executing a type1 or type2 opcode outside of a method */
 840
 841                         status = acpi_ds_exec_end_op(walk_state);
 842                         return_ACPI_STATUS(status);
 843                 }
 844 #endif
 845 #endif
 846                 return_ACPI_STATUS(AE_OK);
 847         }
 848
 849         if (op->common.aml_opcode == AML_SCOPE_OP) {
 850                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 851                                   "Ending scope Op=%p State=%p\n", op,
 852                                   walk_state));
 853         }
 854
 855         object_type = walk_state->op_info->object_type;
 856
 857         /*
 858          * Get the Node/name from the earlier lookup
 859          * (It was saved in the *op structure)
 860          */
 861         node = op->common.node;
 862
 863         /*
 864          * Put the Node on the object stack (Contains the ACPI Name of
 865          * this object)
 866          */
 867         walk_state->operands[0] = (void *)node;
 868         walk_state->num_operands = 1;
 869
 870         /* Pop the scope stack */
 871
 872         if (acpi_ns_opens_scope(object_type) &&
 873             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 874                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 875                                   "(%s) Popping scope for Op %p\n",
 876                                   acpi_ut_get_type_name(object_type), op));
 877
 878                 status = acpi_ds_scope_stack_pop(walk_state);
 879                 if (ACPI_FAILURE(status)) {
 880                         goto cleanup;
 881                 }
 882         }
 883
 884         /*
 885          * Named operations are as follows:
 886          *
 887          * AML_ALIAS
 888          * AML_BANKFIELD
 889          * AML_CREATEBITFIELD
 890          * AML_CREATEBYTEFIELD
 891          * AML_CREATEDWORDFIELD
 892          * AML_CREATEFIELD
 893          * AML_CREATEQWORDFIELD
 894          * AML_CREATEWORDFIELD
 895          * AML_DATA_REGION
 896          * AML_DEVICE
 897          * AML_EVENT
 898          * AML_FIELD
 899          * AML_INDEXFIELD
 900          * AML_METHOD
 901          * AML_METHODCALL
 902          * AML_MUTEX
 903          * AML_NAME
 904          * AML_NAMEDFIELD
 905          * AML_OPREGION
 906          * AML_POWERRES
 907          * AML_PROCESSOR
 908          * AML_SCOPE
 909          * AML_THERMALZONE
 910          */
 911
 912         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 913                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 914                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 915                           walk_state, op, node));
 916
 917         /* Decode the opcode */
 918
 919         arg = op->common.value.arg;
 920
 921         switch (walk_state->op_info->type) {
 922 #ifndef ACPI_NO_METHOD_EXECUTION
 923
 924         case AML_TYPE_CREATE_FIELD:
 925                 /*
 926                  * Create the field object, but the field buffer and index must
 927                  * be evaluated later during the execution phase
 928                  */
 929                 status = acpi_ds_create_buffer_field(op, walk_state);
 930                 break;
 931
 932         case AML_TYPE_NAMED_FIELD:
 933                 /*
 934                  * If we are executing a method, initialize the field
 935                  */
 936                 if (walk_state->method_node) {
 937                         status = acpi_ds_init_field_objects(op, walk_state);
 938                 }
 939
 940                 switch (op->common.aml_opcode) {
 941                 case AML_INDEX_FIELD_OP:
 942
 943                         status =
 944                             acpi_ds_create_index_field(op,
 945                                                        (acpi_handle) arg->
 946                                                        common.node, walk_state);
 947                         break;
 948
 949                 case AML_BANK_FIELD_OP:
 950
 951                         status =
 952                             acpi_ds_create_bank_field(op, arg->common.node,
 953                                                       walk_state);
 954                         break;
 955
 956                 case AML_FIELD_OP:
 957
 958                         status =
 959                             acpi_ds_create_field(op, arg->common.node,
 960                                                  walk_state);
 961                         break;
 962
 963                 default:
 964                         /* All NAMED_FIELD opcodes must be handled above */
 965                         break;
 966                 }
 967                 break;
 968
 969         case AML_TYPE_NAMED_SIMPLE:
 970
 971                 status = acpi_ds_create_operands(walk_state, arg);
 972                 if (ACPI_FAILURE(status)) {
 973                         goto cleanup;
 974                 }
 975
 976                 switch (op->common.aml_opcode) {
 977                 case AML_PROCESSOR_OP:
 978
 979                         status = acpi_ex_create_processor(walk_state);
 980                         break;
 981
 982                 case AML_POWER_RES_OP:
 983
 984                         status = acpi_ex_create_power_resource(walk_state);
 985                         break;
 986
 987                 case AML_MUTEX_OP:
 988
 989                         status = acpi_ex_create_mutex(walk_state);
 990                         break;
 991
 992                 case AML_EVENT_OP:
 993
 994                         status = acpi_ex_create_event(walk_state);
 995                         break;
 996
 997                 case AML_DATA_REGION_OP:
 998
 999                         status = acpi_ex_create_table_region(walk_state);
1000                         break;
1001
1002                 case AML_ALIAS_OP:
1003
1004                         status = acpi_ex_create_alias(walk_state);
1005                         break;
1006
1007                 default:
1008                         /* Unknown opcode */
1009
1010                         status = AE_OK;
1011                         goto cleanup;
1012                 }
1013
1014                 /* Delete operands */
1015
1016                 for (i = 1; i < walk_state->num_operands; i++) {
1017                         acpi_ut_remove_reference(walk_state->operands[i]);
1018                         walk_state->operands[i] = NULL;
1019                 }
1020
1021                 break;
1022 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1023
1024         case AML_TYPE_NAMED_COMPLEX:
1025
1026                 switch (op->common.aml_opcode) {
1027 #ifndef ACPI_NO_METHOD_EXECUTION
1028                 case AML_REGION_OP:
1029
1030                         /*
1031                          * If we are executing a method, initialize the region
1032                          */
1033                         if (walk_state->method_node) {
1034                                 status =
1035                                     acpi_ex_create_region(op->named.data,
1036                                                           op->named.length,
1037                                                           (acpi_adr_space_type)
1038                                                           ((op->common.value.
1039                                                             arg)->common.value.
1040                                                            integer),
1041                                                           walk_state);
1042                                 if (ACPI_FAILURE(status)) {
1043                                         return (status);
1044                                 }
1045                         }
1046
1047                         /*
1048                          * The op_region is not fully parsed at this time. Only valid
1049                          * argument is the space_id. (We must save the address of the
1050                          * AML of the address and length operands)
1051                          */
1052
1053                         /*
1054                          * If we have a valid region, initialize it
1055                          * Namespace is NOT locked at this point.
1056                          */
1057                         status =
1058                             acpi_ev_initialize_region
1059                             (acpi_ns_get_attached_object(node), FALSE);
1060                         if (ACPI_FAILURE(status)) {
1061                                 /*
1062                                  *  If AE_NOT_EXIST is returned, it is not fatal
1063                                  *  because many regions get created before a handler
1064                                  *  is installed for said region.
1065                                  */
1066                                 if (AE_NOT_EXIST == status) {
1067                                         status = AE_OK;
1068                                 }
1069                         }
1070                         break;
1071
1072                 case AML_NAME_OP:
1073
1074                         status = acpi_ds_create_node(walk_state, node, op);
1075                         break;
1076
1077                 case AML_METHOD_OP:
1078                         /*
1079                          * method_op pkg_length name_string method_flags term_list
1080                          *
1081                          * Note: We must create the method node/object pair as soon as we
1082                          * see the method declaration. This allows later pass1 parsing
1083                          * of invocations of the method (need to know the number of
1084                          * arguments.)
1085                          */
1086                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1087                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
1088                                           walk_state, op, op->named.node));
1089
1090                         if (!acpi_ns_get_attached_object(op->named.node)) {
1091                                 walk_state->operands[0] =
1092                                     ACPI_CAST_PTR(void, op->named.node);
1093                                 walk_state->num_operands = 1;
1094
1095                                 status =
1096                                     acpi_ds_create_operands(walk_state,
1097                                                             op->common.value.
1098                                                             arg);
1099                                 if (ACPI_SUCCESS(status)) {
1100                                         status =
1101                                             acpi_ex_create_method(op->named.
1102                                                                   data,
1103                                                                   op->named.
1104                                                                   length,
1105                                                                   walk_state);
1106                                 }
1107                                 walk_state->operands[0] = NULL;
1108                                 walk_state->num_operands = 0;
1109
1110                                 if (ACPI_FAILURE(status)) {
1111                                         return_ACPI_STATUS(status);
1112                                 }
1113                         }
1114                         break;
1115
1116 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1117
1118                 default:
1119                         /* All NAMED_COMPLEX opcodes must be handled above */
1120                         break;
1121                 }
1122                 break;
1123
1124         case AML_CLASS_INTERNAL:
1125
1126                 /* case AML_INT_NAMEPATH_OP: */
1127                 break;
1128
1129         case AML_CLASS_METHOD_CALL:
1130
1131                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1132                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
1133                                   walk_state, op, node));
1134
1135                 /*
1136                  * Lookup the method name and save the Node
1137                  */
1138                 status =
1139                     acpi_ns_lookup(walk_state->scope_info,
1140                                    arg->common.value.string, ACPI_TYPE_ANY,
1141                                    ACPI_IMODE_LOAD_PASS2,
1142                                    ACPI_NS_SEARCH_PARENT |
1143                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
1144                                    &(new_node));
1145                 if (ACPI_SUCCESS(status)) {
1146                         /*
1147                          * Make sure that what we found is indeed a method
1148                          * We didn't search for a method on purpose, to see if the name
1149                          * would resolve
1150                          */
1151                         if (new_node->type != ACPI_TYPE_METHOD) {
1152                                 status = AE_AML_OPERAND_TYPE;
1153                         }
1154
1155                         /* We could put the returned object (Node) on the object stack for
1156                          * later, but for now, we will put it in the "op" object that the
1157                          * parser uses, so we can get it again at the end of this scope
1158                          */
1159                         op->common.node = new_node;
1160                 } else {
1161                         ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
1162                 }
1163                 break;
1164
1165         default:
1166                 break;
1167         }
1168
1169       cleanup:
1170
1171         /* Remove the Node pushed at the very beginning */
1172
1173         walk_state->operands[0] = NULL;
1174         walk_state->num_operands = 0;
1175         return_ACPI_STATUS(status);
1176 }