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

   1 /******************************************************************************
   2  *
   3  * Module Name: dswload - Dispatcher namespace load callbacks
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include <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                 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 447                         status =
 448                             acpi_ex_create_region(op->named.data,
 449                                                   op->named.length,
 450                                                   REGION_DATA_TABLE,
 451                                                   walk_state);
 452                         if (ACPI_FAILURE(status)) {
 453                                 return_ACPI_STATUS(status);
 454                         }
 455                 }
 456         }
 457 #endif
 458
 459         if (op->common.aml_opcode == AML_NAME_OP) {
 460
 461                 /* For Name opcode, get the object type from the argument */
 462
 463                 if (op->common.value.arg) {
 464                         object_type = (acpi_ps_get_opcode_info((op->common.
 465                                                                 value.arg)->
 466                                                                common.
 467                                                                aml_opcode))->
 468                             object_type;
 469
 470                         /* Set node type if we have a namespace node */
 471
 472                         if (op->common.node) {
 473                                 op->common.node->type = (u8) object_type;
 474                         }
 475                 }
 476         }
 477
 478         /*
 479          * If we are executing a method, do not create any namespace objects
 480          * during the load phase, only during execution.
 481          */
 482         if (!walk_state->method_node) {
 483                 if (op->common.aml_opcode == AML_METHOD_OP) {
 484                         /*
 485                          * method_op pkg_length name_string method_flags term_list
 486                          *
 487                          * Note: We must create the method node/object pair as soon as we
 488                          * see the method declaration. This allows later pass1 parsing
 489                          * of invocations of the method (need to know the number of
 490                          * arguments.)
 491                          */
 492                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 493                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 494                                           walk_state, op, op->named.node));
 495
 496                         if (!acpi_ns_get_attached_object(op->named.node)) {
 497                                 walk_state->operands[0] =
 498                                     ACPI_CAST_PTR(void, op->named.node);
 499                                 walk_state->num_operands = 1;
 500
 501                                 status =
 502                                     acpi_ds_create_operands(walk_state,
 503                                                             op->common.value.
 504                                                             arg);
 505                                 if (ACPI_SUCCESS(status)) {
 506                                         status =
 507                                             acpi_ex_create_method(op->named.
 508                                                                   data,
 509                                                                   op->named.
 510                                                                   length,
 511                                                                   walk_state);
 512                                 }
 513
 514                                 walk_state->operands[0] = NULL;
 515                                 walk_state->num_operands = 0;
 516
 517                                 if (ACPI_FAILURE(status)) {
 518                                         return_ACPI_STATUS(status);
 519                                 }
 520                         }
 521                 }
 522         }
 523
 524         /* Pop the scope stack (only if loading a table) */
 525
 526         if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
 527                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 528                                   "(%s): Popping scope for Op %p\n",
 529                                   acpi_ut_get_type_name(object_type), op));
 530
 531                 status = acpi_ds_scope_stack_pop(walk_state);
 532         }
 533
 534         return_ACPI_STATUS(status);
 535 }
 536
 537 /*******************************************************************************
 538  *
 539  * FUNCTION:    acpi_ds_load2_begin_op
 540  *
 541  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 542  *              out_op          - Wher to return op if a new one is created
 543  *
 544  * RETURN:      Status
 545  *
 546  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 547  *
 548  ******************************************************************************/
 549
 550 acpi_status
 551 acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 552                        union acpi_parse_object **out_op)
 553 {
 554         union acpi_parse_object *op;
 555         struct acpi_namespace_node *node;
 556         acpi_status status;
 557         acpi_object_type object_type;
 558         char *buffer_ptr;
 559         u32 flags;
 560
 561         ACPI_FUNCTION_TRACE(ds_load2_begin_op);
 562
 563         op = walk_state->op;
 564         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 565                           walk_state));
 566
 567         if (op) {
 568                 if ((walk_state->control_state) &&
 569                     (walk_state->control_state->common.state ==
 570                      ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 571
 572                         /* We are executing a while loop outside of a method */
 573
 574                         status = acpi_ds_exec_begin_op(walk_state, out_op);
 575                         return_ACPI_STATUS(status);
 576                 }
 577
 578                 /* We only care about Namespace opcodes here */
 579
 580                 if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
 581                      (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
 582                     (!(walk_state->op_info->flags & AML_NAMED))) {
 583 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 584                         if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 585                             (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 586                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 587                                                   "Begin/EXEC: %s (fl %8.8X)\n",
 588                                                   walk_state->op_info->name,
 589                                                   walk_state->op_info->flags));
 590
 591                                 /* Executing a type1 or type2 opcode outside of a method */
 592
 593                                 status =
 594                                     acpi_ds_exec_begin_op(walk_state, out_op);
 595                                 return_ACPI_STATUS(status);
 596                         }
 597 #endif
 598                         return_ACPI_STATUS(AE_OK);
 599                 }
 600
 601                 /* Get the name we are going to enter or lookup in the namespace */
 602
 603                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 604
 605                         /* For Namepath op, get the path string */
 606
 607                         buffer_ptr = op->common.value.string;
 608                         if (!buffer_ptr) {
 609
 610                                 /* No name, just exit */
 611
 612                                 return_ACPI_STATUS(AE_OK);
 613                         }
 614                 } else {
 615                         /* Get name from the op */
 616
 617                         buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
 618                 }
 619         } else {
 620                 /* Get the namestring from the raw AML */
 621
 622                 buffer_ptr =
 623                     acpi_ps_get_next_namestring(&walk_state->parser_state);
 624         }
 625
 626         /* Map the opcode into an internal object type */
 627
 628         object_type = walk_state->op_info->object_type;
 629
 630         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 631                           "State=%p Op=%p Type=%X\n", walk_state, op,
 632                           object_type));
 633
 634         switch (walk_state->opcode) {
 635         case AML_FIELD_OP:
 636         case AML_BANK_FIELD_OP:
 637         case AML_INDEX_FIELD_OP:
 638
 639                 node = NULL;
 640                 status = AE_OK;
 641                 break;
 642
 643         case AML_INT_NAMEPATH_OP:
 644                 /*
 645                  * The name_path is an object reference to an existing object.
 646                  * Don't enter the name into the namespace, but look it up
 647                  * for use later.
 648                  */
 649                 status =
 650                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 651                                    object_type, ACPI_IMODE_EXECUTE,
 652                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 653                 break;
 654
 655         case AML_SCOPE_OP:
 656                 /*
 657                  * The Path is an object reference to an existing object.
 658                  * Don't enter the name into the namespace, but look it up
 659                  * for use later.
 660                  */
 661                 status =
 662                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 663                                    object_type, ACPI_IMODE_EXECUTE,
 664                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 665                 if (ACPI_FAILURE(status)) {
 666 #ifdef ACPI_ASL_COMPILER
 667                         if (status == AE_NOT_FOUND) {
 668                                 status = AE_OK;
 669                         } else {
 670                                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 671                         }
 672 #else
 673                         ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 674 #endif
 675                         return_ACPI_STATUS(status);
 676                 }
 677
 678                 /*
 679                  * We must check to make sure that the target is
 680                  * one of the opcodes that actually opens a scope
 681                  */
 682                 switch (node->type) {
 683                 case ACPI_TYPE_ANY:
 684                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 685                 case ACPI_TYPE_DEVICE:
 686                 case ACPI_TYPE_POWER:
 687                 case ACPI_TYPE_PROCESSOR:
 688                 case ACPI_TYPE_THERMAL:
 689
 690                         /* These are acceptable types */
 691                         break;
 692
 693                 case ACPI_TYPE_INTEGER:
 694                 case ACPI_TYPE_STRING:
 695                 case ACPI_TYPE_BUFFER:
 696
 697                         /*
 698                          * These types we will allow, but we will change the type. This
 699                          * enables some existing code of the form:
 700                          *
 701                          *  Name (DEB, 0)
 702                          *  Scope (DEB) { ... }
 703                          */
 704                         ACPI_WARNING((AE_INFO,
 705                                       "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)",
 706                                       buffer_ptr,
 707                                       acpi_ut_get_type_name(node->type)));
 708
 709                         node->type = ACPI_TYPE_ANY;
 710                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 711                         break;
 712
 713                 default:
 714
 715                         /* All other types are an error */
 716
 717                         ACPI_ERROR((AE_INFO,
 718                                     "Invalid type (%s) for target of Scope operator [%4.4s]",
 719                                     acpi_ut_get_type_name(node->type),
 720                                     buffer_ptr));
 721
 722                         return (AE_AML_OPERAND_TYPE);
 723                 }
 724                 break;
 725
 726         default:
 727
 728                 /* All other opcodes */
 729
 730                 if (op && op->common.node) {
 731
 732                         /* This op/node was previously entered into the namespace */
 733
 734                         node = op->common.node;
 735
 736                         if (acpi_ns_opens_scope(object_type)) {
 737                                 status =
 738                                     acpi_ds_scope_stack_push(node, object_type,
 739                                                              walk_state);
 740                                 if (ACPI_FAILURE(status)) {
 741                                         return_ACPI_STATUS(status);
 742                                 }
 743                         }
 744
 745                         return_ACPI_STATUS(AE_OK);
 746                 }
 747
 748                 /*
 749                  * Enter the named type into the internal namespace. We enter the name
 750                  * as we go downward in the parse tree. Any necessary subobjects that
 751                  * involve arguments to the opcode must be created as we go back up the
 752                  * parse tree later.
 753                  *
 754                  * Note: Name may already exist if we are executing a deferred opcode.
 755                  */
 756                 if (walk_state->deferred_node) {
 757
 758                         /* This name is already in the namespace, get the node */
 759
 760                         node = walk_state->deferred_node;
 761                         status = AE_OK;
 762                         break;
 763                 }
 764
 765                 flags = ACPI_NS_NO_UPSEARCH;
 766                 if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {
 767
 768                         /* Execution mode, node cannot already exist, node is temporary */
 769
 770                         flags |= (ACPI_NS_ERROR_IF_FOUND | ACPI_NS_TEMPORARY);
 771                 }
 772
 773                 /* Add new entry or lookup existing entry */
 774
 775                 status =
 776                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 777                                    object_type, ACPI_IMODE_LOAD_PASS2, flags,
 778                                    walk_state, &node);
 779
 780                 if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
 781                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 782                                           "***New Node [%4.4s] %p is temporary\n",
 783                                           acpi_ut_get_node_name(node), node));
 784                 }
 785                 break;
 786         }
 787
 788         if (ACPI_FAILURE(status)) {
 789                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 790                 return_ACPI_STATUS(status);
 791         }
 792
 793         if (!op) {
 794
 795                 /* Create a new op */
 796
 797                 op = acpi_ps_alloc_op(walk_state->opcode);
 798                 if (!op) {
 799                         return_ACPI_STATUS(AE_NO_MEMORY);
 800                 }
 801
 802                 /* Initialize the new op */
 803
 804                 if (node) {
 805                         op->named.name = node->name.integer;
 806                 }
 807                 *out_op = op;
 808         }
 809
 810         /*
 811          * Put the Node in the "op" object that the parser uses, so we
 812          * can get it again quickly when this scope is closed
 813          */
 814         op->common.node = node;
 815         return_ACPI_STATUS(status);
 816 }
 817
 818 /*******************************************************************************
 819  *
 820  * FUNCTION:    acpi_ds_load2_end_op
 821  *
 822  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 823  *
 824  * RETURN:      Status
 825  *
 826  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 827  *              both control methods and everything else.
 828  *
 829  ******************************************************************************/
 830
 831 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 832 {
 833         union acpi_parse_object *op;
 834         acpi_status status = AE_OK;
 835         acpi_object_type object_type;
 836         struct acpi_namespace_node *node;
 837         union acpi_parse_object *arg;
 838         struct acpi_namespace_node *new_node;
 839 #ifndef ACPI_NO_METHOD_EXECUTION
 840         u32 i;
 841         u8 region_space;
 842 #endif
 843
 844         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 845
 846         op = walk_state->op;
 847         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 848                           walk_state->op_info->name, op, walk_state));
 849
 850         /* Check if opcode had an associated namespace object */
 851
 852         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 853 #ifndef ACPI_NO_METHOD_EXECUTION
 854 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 855                 /* No namespace object. Executable opcode? */
 856
 857                 if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 858                     (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 859                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 860                                           "End/EXEC:   %s (fl %8.8X)\n",
 861                                           walk_state->op_info->name,
 862                                           walk_state->op_info->flags));
 863
 864                         /* Executing a type1 or type2 opcode outside of a method */
 865
 866                         status = acpi_ds_exec_end_op(walk_state);
 867                         return_ACPI_STATUS(status);
 868                 }
 869 #endif
 870 #endif
 871                 return_ACPI_STATUS(AE_OK);
 872         }
 873
 874         if (op->common.aml_opcode == AML_SCOPE_OP) {
 875                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 876                                   "Ending scope Op=%p State=%p\n", op,
 877                                   walk_state));
 878         }
 879
 880         object_type = walk_state->op_info->object_type;
 881
 882         /*
 883          * Get the Node/name from the earlier lookup
 884          * (It was saved in the *op structure)
 885          */
 886         node = op->common.node;
 887
 888         /*
 889          * Put the Node on the object stack (Contains the ACPI Name of
 890          * this object)
 891          */
 892         walk_state->operands[0] = (void *)node;
 893         walk_state->num_operands = 1;
 894
 895         /* Pop the scope stack */
 896
 897         if (acpi_ns_opens_scope(object_type) &&
 898             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 899                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 900                                   "(%s) Popping scope for Op %p\n",
 901                                   acpi_ut_get_type_name(object_type), op));
 902
 903                 status = acpi_ds_scope_stack_pop(walk_state);
 904                 if (ACPI_FAILURE(status)) {
 905                         goto cleanup;
 906                 }
 907         }
 908
 909         /*
 910          * Named operations are as follows:
 911          *
 912          * AML_ALIAS
 913          * AML_BANKFIELD
 914          * AML_CREATEBITFIELD
 915          * AML_CREATEBYTEFIELD
 916          * AML_CREATEDWORDFIELD
 917          * AML_CREATEFIELD
 918          * AML_CREATEQWORDFIELD
 919          * AML_CREATEWORDFIELD
 920          * AML_DATA_REGION
 921          * AML_DEVICE
 922          * AML_EVENT
 923          * AML_FIELD
 924          * AML_INDEXFIELD
 925          * AML_METHOD
 926          * AML_METHODCALL
 927          * AML_MUTEX
 928          * AML_NAME
 929          * AML_NAMEDFIELD
 930          * AML_OPREGION
 931          * AML_POWERRES
 932          * AML_PROCESSOR
 933          * AML_SCOPE
 934          * AML_THERMALZONE
 935          */
 936
 937         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 938                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 939                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 940                           walk_state, op, node));
 941
 942         /* Decode the opcode */
 943
 944         arg = op->common.value.arg;
 945
 946         switch (walk_state->op_info->type) {
 947 #ifndef ACPI_NO_METHOD_EXECUTION
 948
 949         case AML_TYPE_CREATE_FIELD:
 950                 /*
 951                  * Create the field object, but the field buffer and index must
 952                  * be evaluated later during the execution phase
 953                  */
 954                 status = acpi_ds_create_buffer_field(op, walk_state);
 955                 break;
 956
 957         case AML_TYPE_NAMED_FIELD:
 958                 /*
 959                  * If we are executing a method, initialize the field
 960                  */
 961                 if (walk_state->method_node) {
 962                         status = acpi_ds_init_field_objects(op, walk_state);
 963                 }
 964
 965                 switch (op->common.aml_opcode) {
 966                 case AML_INDEX_FIELD_OP:
 967
 968                         status =
 969                             acpi_ds_create_index_field(op,
 970                                                        (acpi_handle) arg->
 971                                                        common.node, walk_state);
 972                         break;
 973
 974                 case AML_BANK_FIELD_OP:
 975
 976                         status =
 977                             acpi_ds_create_bank_field(op, arg->common.node,
 978                                                       walk_state);
 979                         break;
 980
 981                 case AML_FIELD_OP:
 982
 983                         status =
 984                             acpi_ds_create_field(op, arg->common.node,
 985                                                  walk_state);
 986                         break;
 987
 988                 default:
 989                         /* All NAMED_FIELD opcodes must be handled above */
 990                         break;
 991                 }
 992                 break;
 993
 994         case AML_TYPE_NAMED_SIMPLE:
 995
 996                 status = acpi_ds_create_operands(walk_state, arg);
 997                 if (ACPI_FAILURE(status)) {
 998                         goto cleanup;
 999                 }
1000
1001                 switch (op->common.aml_opcode) {
1002                 case AML_PROCESSOR_OP:
1003
1004                         status = acpi_ex_create_processor(walk_state);
1005                         break;
1006
1007                 case AML_POWER_RES_OP:
1008
1009                         status = acpi_ex_create_power_resource(walk_state);
1010                         break;
1011
1012                 case AML_MUTEX_OP:
1013
1014                         status = acpi_ex_create_mutex(walk_state);
1015                         break;
1016
1017                 case AML_EVENT_OP:
1018
1019                         status = acpi_ex_create_event(walk_state);
1020                         break;
1021
1022                 case AML_ALIAS_OP:
1023
1024                         status = acpi_ex_create_alias(walk_state);
1025                         break;
1026
1027                 default:
1028                         /* Unknown opcode */
1029
1030                         status = AE_OK;
1031                         goto cleanup;
1032                 }
1033
1034                 /* Delete operands */
1035
1036                 for (i = 1; i < walk_state->num_operands; i++) {
1037                         acpi_ut_remove_reference(walk_state->operands[i]);
1038                         walk_state->operands[i] = NULL;
1039                 }
1040
1041                 break;
1042 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1043
1044         case AML_TYPE_NAMED_COMPLEX:
1045
1046                 switch (op->common.aml_opcode) {
1047 #ifndef ACPI_NO_METHOD_EXECUTION
1048                 case AML_REGION_OP:
1049                 case AML_DATA_REGION_OP:
1050
1051                         if (op->common.aml_opcode == AML_REGION_OP) {
1052                                 region_space = (acpi_adr_space_type)
1053                                     ((op->common.value.arg)->common.value.
1054                                      integer);
1055                         } else {
1056                                 region_space = REGION_DATA_TABLE;
1057                         }
1058
1059                         /*
1060                          * If we are executing a method, initialize the region
1061                          */
1062                         if (walk_state->method_node) {
1063                                 status =
1064                                     acpi_ex_create_region(op->named.data,
1065                                                           op->named.length,
1066                                                           region_space,
1067                                                           walk_state);
1068                                 if (ACPI_FAILURE(status)) {
1069                                         return (status);
1070                                 }
1071                         }
1072
1073                         /*
1074                          * The op_region is not fully parsed at this time. Only valid
1075                          * argument is the space_id. (We must save the address of the
1076                          * AML of the address and length operands)
1077                          */
1078
1079                         /*
1080                          * If we have a valid region, initialize it
1081                          * Namespace is NOT locked at this point.
1082                          */
1083                         status =
1084                             acpi_ev_initialize_region
1085                             (acpi_ns_get_attached_object(node), FALSE);
1086                         if (ACPI_FAILURE(status)) {
1087                                 /*
1088                                  *  If AE_NOT_EXIST is returned, it is not fatal
1089                                  *  because many regions get created before a handler
1090                                  *  is installed for said region.
1091                                  */
1092                                 if (AE_NOT_EXIST == status) {
1093                                         status = AE_OK;
1094                                 }
1095                         }
1096                         break;
1097
1098                 case AML_NAME_OP:
1099
1100                         status = acpi_ds_create_node(walk_state, node, op);
1101                         break;
1102
1103                 case AML_METHOD_OP:
1104                         /*
1105                          * method_op pkg_length name_string method_flags term_list
1106                          *
1107                          * Note: We must create the method node/object pair as soon as we
1108                          * see the method declaration. This allows later pass1 parsing
1109                          * of invocations of the method (need to know the number of
1110                          * arguments.)
1111                          */
1112                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1113                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
1114                                           walk_state, op, op->named.node));
1115
1116                         if (!acpi_ns_get_attached_object(op->named.node)) {
1117                                 walk_state->operands[0] =
1118                                     ACPI_CAST_PTR(void, op->named.node);
1119                                 walk_state->num_operands = 1;
1120
1121                                 status =
1122                                     acpi_ds_create_operands(walk_state,
1123                                                             op->common.value.
1124                                                             arg);
1125                                 if (ACPI_SUCCESS(status)) {
1126                                         status =
1127                                             acpi_ex_create_method(op->named.
1128                                                                   data,
1129                                                                   op->named.
1130                                                                   length,
1131                                                                   walk_state);
1132                                 }
1133                                 walk_state->operands[0] = NULL;
1134                                 walk_state->num_operands = 0;
1135
1136                                 if (ACPI_FAILURE(status)) {
1137                                         return_ACPI_STATUS(status);
1138                                 }
1139                         }
1140                         break;
1141
1142 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1143
1144                 default:
1145                         /* All NAMED_COMPLEX opcodes must be handled above */
1146                         break;
1147                 }
1148                 break;
1149
1150         case AML_CLASS_INTERNAL:
1151
1152                 /* case AML_INT_NAMEPATH_OP: */
1153                 break;
1154
1155         case AML_CLASS_METHOD_CALL:
1156
1157                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1158                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
1159                                   walk_state, op, node));
1160
1161                 /*
1162                  * Lookup the method name and save the Node
1163                  */
1164                 status =
1165                     acpi_ns_lookup(walk_state->scope_info,
1166                                    arg->common.value.string, ACPI_TYPE_ANY,
1167                                    ACPI_IMODE_LOAD_PASS2,
1168                                    ACPI_NS_SEARCH_PARENT |
1169                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
1170                                    &(new_node));
1171                 if (ACPI_SUCCESS(status)) {
1172                         /*
1173                          * Make sure that what we found is indeed a method
1174                          * We didn't search for a method on purpose, to see if the name
1175                          * would resolve
1176                          */
1177                         if (new_node->type != ACPI_TYPE_METHOD) {
1178                                 status = AE_AML_OPERAND_TYPE;
1179                         }
1180
1181                         /* We could put the returned object (Node) on the object stack for
1182                          * later, but for now, we will put it in the "op" object that the
1183                          * parser uses, so we can get it again at the end of this scope
1184                          */
1185                         op->common.node = new_node;
1186                 } else {
1187                         ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
1188                 }
1189                 break;
1190
1191         default:
1192                 break;
1193         }
1194
1195       cleanup:
1196
1197         /* Remove the Node pushed at the very beginning */
1198
1199         walk_state->operands[0] = NULL;
1200         walk_state->num_operands = 0;
1201         return_ACPI_STATUS(status);
1202 }