drivers/acpi/acpica/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 "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48 #include "acdispat.h"
  49 #include "acinterp.h"
  50 #include "acnamesp.h"
  51 #include "acevents.h"
  52
  53 #ifdef ACPI_ASL_COMPILER
  54 #include <acpi/acdisasm.h>
  55 #endif
  56
  57 #define _COMPONENT          ACPI_DISPATCHER
  58 ACPI_MODULE_NAME("dswload")
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ds_init_callbacks
  63  *
  64  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  65  *              pass_number     - 1, 2, or 3
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Init walk state callbacks
  70  *
  71  ******************************************************************************/
  72 acpi_status
  73 acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
  74 {
  75
  76         switch (pass_number) {
  77         case 1:
  78                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  79                     ACPI_PARSE_DELETE_TREE;
  80                 walk_state->descending_callback = acpi_ds_load1_begin_op;
  81                 walk_state->ascending_callback = acpi_ds_load1_end_op;
  82                 break;
  83
  84         case 2:
  85                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  86                     ACPI_PARSE_DELETE_TREE;
  87                 walk_state->descending_callback = acpi_ds_load2_begin_op;
  88                 walk_state->ascending_callback = acpi_ds_load2_end_op;
  89                 break;
  90
  91         case 3:
  92 #ifndef ACPI_NO_METHOD_EXECUTION
  93                 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
  94                     ACPI_PARSE_DELETE_TREE;
  95                 walk_state->descending_callback = acpi_ds_exec_begin_op;
  96                 walk_state->ascending_callback = acpi_ds_exec_end_op;
  97 #endif
  98                 break;
  99
 100         default:
 101                 return (AE_BAD_PARAMETER);
 102         }
 103
 104         return (AE_OK);
 105 }
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    acpi_ds_load1_begin_op
 110  *
 111  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 112  *              out_op          - Where to return op if a new one is created
 113  *
 114  * RETURN:      Status
 115  *
 116  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 117  *
 118  ******************************************************************************/
 119
 120 acpi_status
 121 acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 122                        union acpi_parse_object ** out_op)
 123 {
 124         union acpi_parse_object *op;
 125         struct acpi_namespace_node *node;
 126         acpi_status status;
 127         acpi_object_type object_type;
 128         char *path;
 129         u32 flags;
 130
 131         ACPI_FUNCTION_TRACE(ds_load1_begin_op);
 132
 133         op = walk_state->op;
 134         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 135                           walk_state));
 136
 137         /* We are only interested in opcodes that have an associated name */
 138
 139         if (op) {
 140                 if (!(walk_state->op_info->flags & AML_NAMED)) {
 141                         *out_op = op;
 142                         return_ACPI_STATUS(AE_OK);
 143                 }
 144
 145                 /* Check if this object has already been installed in the namespace */
 146
 147                 if (op->common.node) {
 148                         *out_op = op;
 149                         return_ACPI_STATUS(AE_OK);
 150                 }
 151         }
 152
 153         path = acpi_ps_get_next_namestring(&walk_state->parser_state);
 154
 155         /* Map the raw opcode into an internal object type */
 156
 157         object_type = walk_state->op_info->object_type;
 158
 159         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 160                           "State=%p Op=%p [%s]\n", walk_state, op,
 161                           acpi_ut_get_type_name(object_type)));
 162
 163         switch (walk_state->opcode) {
 164         case AML_SCOPE_OP:
 165
 166                 /*
 167                  * The target name of the Scope() operator must exist at this point so
 168                  * that we can actually open the scope to enter new names underneath it.
 169                  * Allow search-to-root for single namesegs.
 170                  */
 171                 status =
 172                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 173                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 174                                    walk_state, &(node));
 175 #ifdef ACPI_ASL_COMPILER
 176                 if (status == AE_NOT_FOUND) {
 177                         /*
 178                          * Table disassembly:
 179                          * Target of Scope() not found. Generate an External for it, and
 180                          * insert the name into the namespace.
 181                          */
 182                         acpi_dm_add_to_external_list(path, ACPI_TYPE_DEVICE, 0);
 183                         status =
 184                             acpi_ns_lookup(walk_state->scope_info, path,
 185                                            object_type, ACPI_IMODE_LOAD_PASS1,
 186                                            ACPI_NS_SEARCH_PARENT, walk_state,
 187                                            &node);
 188                 }
 189 #endif
 190                 if (ACPI_FAILURE(status)) {
 191                         ACPI_ERROR_NAMESPACE(path, status);
 192                         return_ACPI_STATUS(status);
 193                 }
 194
 195                 /*
 196                  * Check to make sure that the target is
 197                  * one of the opcodes that actually opens a scope
 198                  */
 199                 switch (node->type) {
 200                 case ACPI_TYPE_ANY:
 201                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope  */
 202                 case ACPI_TYPE_DEVICE:
 203                 case ACPI_TYPE_POWER:
 204                 case ACPI_TYPE_PROCESSOR:
 205                 case ACPI_TYPE_THERMAL:
 206
 207                         /* These are acceptable types */
 208                         break;
 209
 210                 case ACPI_TYPE_INTEGER:
 211                 case ACPI_TYPE_STRING:
 212                 case ACPI_TYPE_BUFFER:
 213
 214                         /*
 215                          * These types we will allow, but we will change the type. This
 216                          * enables some existing code of the form:
 217                          *
 218                          *  Name (DEB, 0)
 219                          *  Scope (DEB) { ... }
 220                          *
 221                          * Note: silently change the type here. On the second pass, we will report
 222                          * a warning
 223                          */
 224                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 225                                           "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)\n",
 226                                           path,
 227                                           acpi_ut_get_type_name(node->type)));
 228
 229                         node->type = ACPI_TYPE_ANY;
 230                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 231                         break;
 232
 233                 default:
 234
 235                         /* All other types are an error */
 236
 237                         ACPI_ERROR((AE_INFO,
 238                                     "Invalid type (%s) for target of Scope operator [%4.4s] (Cannot override)",
 239                                     acpi_ut_get_type_name(node->type), path));
 240
 241                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 242                 }
 243                 break;
 244
 245         default:
 246                 /*
 247                  * For all other named opcodes, we will enter the name into
 248                  * the namespace.
 249                  *
 250                  * Setup the search flags.
 251                  * Since we are entering a name into the namespace, we do not want to
 252                  * enable the search-to-root upsearch.
 253                  *
 254                  * There are only two conditions where it is acceptable that the name
 255                  * already exists:
 256                  *    1) the Scope() operator can reopen a scoping object that was
 257                  *       previously defined (Scope, Method, Device, etc.)
 258                  *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
 259                  *       buffer_field, or Package), the name of the object is already
 260                  *       in the namespace.
 261                  */
 262                 if (walk_state->deferred_node) {
 263
 264                         /* This name is already in the namespace, get the node */
 265
 266                         node = walk_state->deferred_node;
 267                         status = AE_OK;
 268                         break;
 269                 }
 270
 271                 /*
 272                  * If we are executing a method, do not create any namespace objects
 273                  * during the load phase, only during execution.
 274                  */
 275                 if (walk_state->method_node) {
 276                         node = NULL;
 277                         status = AE_OK;
 278                         break;
 279                 }
 280
 281                 flags = ACPI_NS_NO_UPSEARCH;
 282                 if ((walk_state->opcode != AML_SCOPE_OP) &&
 283                     (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
 284                         flags |= ACPI_NS_ERROR_IF_FOUND;
 285                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 286                                           "[%s] Cannot already exist\n",
 287                                           acpi_ut_get_type_name(object_type)));
 288                 } else {
 289                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 290                                           "[%s] Both Find or Create allowed\n",
 291                                           acpi_ut_get_type_name(object_type)));
 292                 }
 293
 294                 /*
 295                  * Enter the named type into the internal namespace. We enter the name
 296                  * as we go downward in the parse tree. Any necessary subobjects that
 297                  * involve arguments to the opcode must be created as we go back up the
 298                  * parse tree later.
 299                  */
 300                 status =
 301                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 302                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
 303                                    &node);
 304                 if (ACPI_FAILURE(status)) {
 305                         if (status == AE_ALREADY_EXISTS) {
 306
 307                                 /* The name already exists in this scope */
 308
 309                                 if (node->flags & ANOBJ_IS_EXTERNAL) {
 310                                         /*
 311                                          * Allow one create on an object or segment that was
 312                                          * previously declared External
 313                                          */
 314                                         node->flags &= ~ANOBJ_IS_EXTERNAL;
 315                                         node->type = (u8) object_type;
 316
 317                                         /* Just retyped a node, probably will need to open a scope */
 318
 319                                         if (acpi_ns_opens_scope(object_type)) {
 320                                                 status =
 321                                                     acpi_ds_scope_stack_push
 322                                                     (node, object_type,
 323                                                      walk_state);
 324                                                 if (ACPI_FAILURE(status)) {
 325                                                         return_ACPI_STATUS
 326                                                             (status);
 327                                                 }
 328                                         }
 329
 330                                         status = AE_OK;
 331                                 }
 332                         }
 333
 334                         if (ACPI_FAILURE(status)) {
 335                                 ACPI_ERROR_NAMESPACE(path, status);
 336                                 return_ACPI_STATUS(status);
 337                         }
 338                 }
 339                 break;
 340         }
 341
 342         /* Common exit */
 343
 344         if (!op) {
 345
 346                 /* Create a new op */
 347
 348                 op = acpi_ps_alloc_op(walk_state->opcode);
 349                 if (!op) {
 350                         return_ACPI_STATUS(AE_NO_MEMORY);
 351                 }
 352         }
 353
 354         /* Initialize the op */
 355
 356 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
 357         op->named.path = ACPI_CAST_PTR(u8, path);
 358 #endif
 359
 360         if (node) {
 361                 /*
 362                  * Put the Node in the "op" object that the parser uses, so we
 363                  * can get it again quickly when this scope is closed
 364                  */
 365                 op->common.node = node;
 366                 op->named.name = node->name.integer;
 367         }
 368
 369         acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
 370                            op);
 371         *out_op = op;
 372         return_ACPI_STATUS(status);
 373 }
 374
 375 /*******************************************************************************
 376  *
 377  * FUNCTION:    acpi_ds_load1_end_op
 378  *
 379  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 380  *
 381  * RETURN:      Status
 382  *
 383  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 384  *              both control methods and everything else.
 385  *
 386  ******************************************************************************/
 387
 388 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 389 {
 390         union acpi_parse_object *op;
 391         acpi_object_type object_type;
 392         acpi_status status = AE_OK;
 393
 394         ACPI_FUNCTION_TRACE(ds_load1_end_op);
 395
 396         op = walk_state->op;
 397         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 398                           walk_state));
 399
 400         /* We are only interested in opcodes that have an associated name */
 401
 402         if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
 403                 return_ACPI_STATUS(AE_OK);
 404         }
 405
 406         /* Get the object type to determine if we should pop the scope */
 407
 408         object_type = walk_state->op_info->object_type;
 409
 410 #ifndef ACPI_NO_METHOD_EXECUTION
 411         if (walk_state->op_info->flags & AML_FIELD) {
 412                 /*
 413                  * If we are executing a method, do not create any namespace objects
 414                  * during the load phase, only during execution.
 415                  */
 416                 if (!walk_state->method_node) {
 417                         if (walk_state->opcode == AML_FIELD_OP ||
 418                             walk_state->opcode == AML_BANK_FIELD_OP ||
 419                             walk_state->opcode == AML_INDEX_FIELD_OP) {
 420                                 status =
 421                                     acpi_ds_init_field_objects(op, walk_state);
 422                         }
 423                 }
 424                 return_ACPI_STATUS(status);
 425         }
 426
 427         /*
 428          * If we are executing a method, do not create any namespace objects
 429          * during the load phase, only during execution.
 430          */
 431         if (!walk_state->method_node) {
 432                 if (op->common.aml_opcode == AML_REGION_OP) {
 433                         status =
 434                             acpi_ex_create_region(op->named.data,
 435                                                   op->named.length,
 436                                                   (acpi_adr_space_type) ((op->
 437                                                                           common.
 438                                                                           value.
 439                                                                           arg)->
 440                                                                          common.
 441                                                                          value.
 442                                                                          integer),
 443                                                   walk_state);
 444                         if (ACPI_FAILURE(status)) {
 445                                 return_ACPI_STATUS(status);
 446                         }
 447                 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 448                         status =
 449                             acpi_ex_create_region(op->named.data,
 450                                                   op->named.length,
 451                                                   REGION_DATA_TABLE,
 452                                                   walk_state);
 453                         if (ACPI_FAILURE(status)) {
 454                                 return_ACPI_STATUS(status);
 455                         }
 456                 }
 457         }
 458 #endif
 459
 460         if (op->common.aml_opcode == AML_NAME_OP) {
 461
 462                 /* For Name opcode, get the object type from the argument */
 463
 464                 if (op->common.value.arg) {
 465                         object_type = (acpi_ps_get_opcode_info((op->common.
 466                                                                 value.arg)->
 467                                                                common.
 468                                                                aml_opcode))->
 469                             object_type;
 470
 471                         /* Set node type if we have a namespace node */
 472
 473                         if (op->common.node) {
 474                                 op->common.node->type = (u8) object_type;
 475                         }
 476                 }
 477         }
 478
 479         /*
 480          * If we are executing a method, do not create any namespace objects
 481          * during the load phase, only during execution.
 482          */
 483         if (!walk_state->method_node) {
 484                 if (op->common.aml_opcode == AML_METHOD_OP) {
 485                         /*
 486                          * method_op pkg_length name_string method_flags term_list
 487                          *
 488                          * Note: We must create the method node/object pair as soon as we
 489                          * see the method declaration. This allows later pass1 parsing
 490                          * of invocations of the method (need to know the number of
 491                          * arguments.)
 492                          */
 493                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 494                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 495                                           walk_state, op, op->named.node));
 496
 497                         if (!acpi_ns_get_attached_object(op->named.node)) {
 498                                 walk_state->operands[0] =
 499                                     ACPI_CAST_PTR(void, op->named.node);
 500                                 walk_state->num_operands = 1;
 501
 502                                 status =
 503                                     acpi_ds_create_operands(walk_state,
 504                                                             op->common.value.
 505                                                             arg);
 506                                 if (ACPI_SUCCESS(status)) {
 507                                         status =
 508                                             acpi_ex_create_method(op->named.
 509                                                                   data,
 510                                                                   op->named.
 511                                                                   length,
 512                                                                   walk_state);
 513                                 }
 514
 515                                 walk_state->operands[0] = NULL;
 516                                 walk_state->num_operands = 0;
 517
 518                                 if (ACPI_FAILURE(status)) {
 519                                         return_ACPI_STATUS(status);
 520                                 }
 521                         }
 522                 }
 523         }
 524
 525         /* Pop the scope stack (only if loading a table) */
 526
 527         if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
 528                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 529                                   "(%s): Popping scope for Op %p\n",
 530                                   acpi_ut_get_type_name(object_type), op));
 531
 532                 status = acpi_ds_scope_stack_pop(walk_state);
 533         }
 534
 535         return_ACPI_STATUS(status);
 536 }
 537
 538 /*******************************************************************************
 539  *
 540  * FUNCTION:    acpi_ds_load2_begin_op
 541  *
 542  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 543  *              out_op          - Wher to return op if a new one is created
 544  *
 545  * RETURN:      Status
 546  *
 547  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 548  *
 549  ******************************************************************************/
 550
 551 acpi_status
 552 acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 553                        union acpi_parse_object **out_op)
 554 {
 555         union acpi_parse_object *op;
 556         struct acpi_namespace_node *node;
 557         acpi_status status;
 558         acpi_object_type object_type;
 559         char *buffer_ptr;
 560         u32 flags;
 561
 562         ACPI_FUNCTION_TRACE(ds_load2_begin_op);
 563
 564         op = walk_state->op;
 565         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 566                           walk_state));
 567
 568         if (op) {
 569                 if ((walk_state->control_state) &&
 570                     (walk_state->control_state->common.state ==
 571                      ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 572
 573                         /* We are executing a while loop outside of a method */
 574
 575                         status = acpi_ds_exec_begin_op(walk_state, out_op);
 576                         return_ACPI_STATUS(status);
 577                 }
 578
 579                 /* We only care about Namespace opcodes here */
 580
 581                 if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
 582                      (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
 583                     (!(walk_state->op_info->flags & AML_NAMED))) {
 584 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 585                         if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 586                             (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 587                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 588                                                   "Begin/EXEC: %s (fl %8.8X)\n",
 589                                                   walk_state->op_info->name,
 590                                                   walk_state->op_info->flags));
 591
 592                                 /* Executing a type1 or type2 opcode outside of a method */
 593
 594                                 status =
 595                                     acpi_ds_exec_begin_op(walk_state, out_op);
 596                                 return_ACPI_STATUS(status);
 597                         }
 598 #endif
 599                         return_ACPI_STATUS(AE_OK);
 600                 }
 601
 602                 /* Get the name we are going to enter or lookup in the namespace */
 603
 604                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 605
 606                         /* For Namepath op, get the path string */
 607
 608                         buffer_ptr = op->common.value.string;
 609                         if (!buffer_ptr) {
 610
 611                                 /* No name, just exit */
 612
 613                                 return_ACPI_STATUS(AE_OK);
 614                         }
 615                 } else {
 616                         /* Get name from the op */
 617
 618                         buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
 619                 }
 620         } else {
 621                 /* Get the namestring from the raw AML */
 622
 623                 buffer_ptr =
 624                     acpi_ps_get_next_namestring(&walk_state->parser_state);
 625         }
 626
 627         /* Map the opcode into an internal object type */
 628
 629         object_type = walk_state->op_info->object_type;
 630
 631         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 632                           "State=%p Op=%p Type=%X\n", walk_state, op,
 633                           object_type));
 634
 635         switch (walk_state->opcode) {
 636         case AML_FIELD_OP:
 637         case AML_BANK_FIELD_OP:
 638         case AML_INDEX_FIELD_OP:
 639
 640                 node = NULL;
 641                 status = AE_OK;
 642                 break;
 643
 644         case AML_INT_NAMEPATH_OP:
 645                 /*
 646                  * The name_path is an object reference to an existing object.
 647                  * Don't enter the name into the namespace, but look it up
 648                  * for use later.
 649                  */
 650                 status =
 651                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 652                                    object_type, ACPI_IMODE_EXECUTE,
 653                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 654                 break;
 655
 656         case AML_SCOPE_OP:
 657                 /*
 658                  * The Path is an object reference to an existing object.
 659                  * Don't enter the name into the namespace, but look it up
 660                  * for use later.
 661                  */
 662                 status =
 663                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 664                                    object_type, ACPI_IMODE_EXECUTE,
 665                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 666                 if (ACPI_FAILURE(status)) {
 667 #ifdef ACPI_ASL_COMPILER
 668                         if (status == AE_NOT_FOUND) {
 669                                 status = AE_OK;
 670                         } else {
 671                                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 672                         }
 673 #else
 674                         ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 675 #endif
 676                         return_ACPI_STATUS(status);
 677                 }
 678
 679                 /*
 680                  * We must check to make sure that the target is
 681                  * one of the opcodes that actually opens a scope
 682                  */
 683                 switch (node->type) {
 684                 case ACPI_TYPE_ANY:
 685                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 686                 case ACPI_TYPE_DEVICE:
 687                 case ACPI_TYPE_POWER:
 688                 case ACPI_TYPE_PROCESSOR:
 689                 case ACPI_TYPE_THERMAL:
 690
 691                         /* These are acceptable types */
 692                         break;
 693
 694                 case ACPI_TYPE_INTEGER:
 695                 case ACPI_TYPE_STRING:
 696                 case ACPI_TYPE_BUFFER:
 697
 698                         /*
 699                          * These types we will allow, but we will change the type. This
 700                          * enables some existing code of the form:
 701                          *
 702                          *  Name (DEB, 0)
 703                          *  Scope (DEB) { ... }
 704                          */
 705                         ACPI_WARNING((AE_INFO,
 706                                       "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)",
 707                                       buffer_ptr,
 708                                       acpi_ut_get_type_name(node->type)));
 709
 710                         node->type = ACPI_TYPE_ANY;
 711                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 712                         break;
 713
 714                 default:
 715
 716                         /* All other types are an error */
 717
 718                         ACPI_ERROR((AE_INFO,
 719                                     "Invalid type (%s) for target of Scope operator [%4.4s]",
 720                                     acpi_ut_get_type_name(node->type),
 721                                     buffer_ptr));
 722
 723                         return (AE_AML_OPERAND_TYPE);
 724                 }
 725                 break;
 726
 727         default:
 728
 729                 /* All other opcodes */
 730
 731                 if (op && op->common.node) {
 732
 733                         /* This op/node was previously entered into the namespace */
 734
 735                         node = op->common.node;
 736
 737                         if (acpi_ns_opens_scope(object_type)) {
 738                                 status =
 739                                     acpi_ds_scope_stack_push(node, object_type,
 740                                                              walk_state);
 741                                 if (ACPI_FAILURE(status)) {
 742                                         return_ACPI_STATUS(status);
 743                                 }
 744                         }
 745
 746                         return_ACPI_STATUS(AE_OK);
 747                 }
 748
 749                 /*
 750                  * Enter the named type into the internal namespace. We enter the name
 751                  * as we go downward in the parse tree. Any necessary subobjects that
 752                  * involve arguments to the opcode must be created as we go back up the
 753                  * parse tree later.
 754                  *
 755                  * Note: Name may already exist if we are executing a deferred opcode.
 756                  */
 757                 if (walk_state->deferred_node) {
 758
 759                         /* This name is already in the namespace, get the node */
 760
 761                         node = walk_state->deferred_node;
 762                         status = AE_OK;
 763                         break;
 764                 }
 765
 766                 flags = ACPI_NS_NO_UPSEARCH;
 767                 if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {
 768
 769                         /* Execution mode, node cannot already exist, node is temporary */
 770
 771                         flags |= (ACPI_NS_ERROR_IF_FOUND | ACPI_NS_TEMPORARY);
 772                 }
 773
 774                 /* Add new entry or lookup existing entry */
 775
 776                 status =
 777                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 778                                    object_type, ACPI_IMODE_LOAD_PASS2, flags,
 779                                    walk_state, &node);
 780
 781                 if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
 782                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 783                                           "***New Node [%4.4s] %p is temporary\n",
 784                                           acpi_ut_get_node_name(node), node));
 785                 }
 786                 break;
 787         }
 788
 789         if (ACPI_FAILURE(status)) {
 790                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 791                 return_ACPI_STATUS(status);
 792         }
 793
 794         if (!op) {
 795
 796                 /* Create a new op */
 797
 798                 op = acpi_ps_alloc_op(walk_state->opcode);
 799                 if (!op) {
 800                         return_ACPI_STATUS(AE_NO_MEMORY);
 801                 }
 802
 803                 /* Initialize the new op */
 804
 805                 if (node) {
 806                         op->named.name = node->name.integer;
 807                 }
 808                 *out_op = op;
 809         }
 810
 811         /*
 812          * Put the Node in the "op" object that the parser uses, so we
 813          * can get it again quickly when this scope is closed
 814          */
 815         op->common.node = node;
 816         return_ACPI_STATUS(status);
 817 }
 818
 819 /*******************************************************************************
 820  *
 821  * FUNCTION:    acpi_ds_load2_end_op
 822  *
 823  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 824  *
 825  * RETURN:      Status
 826  *
 827  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 828  *              both control methods and everything else.
 829  *
 830  ******************************************************************************/
 831
 832 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 833 {
 834         union acpi_parse_object *op;
 835         acpi_status status = AE_OK;
 836         acpi_object_type object_type;
 837         struct acpi_namespace_node *node;
 838         union acpi_parse_object *arg;
 839         struct acpi_namespace_node *new_node;
 840 #ifndef ACPI_NO_METHOD_EXECUTION
 841         u32 i;
 842         u8 region_space;
 843 #endif
 844
 845         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 846
 847         op = walk_state->op;
 848         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 849                           walk_state->op_info->name, op, walk_state));
 850
 851         /* Check if opcode had an associated namespace object */
 852
 853         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 854 #ifndef ACPI_NO_METHOD_EXECUTION
 855 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 856                 /* No namespace object. Executable opcode? */
 857
 858                 if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 859                     (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 860                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 861                                           "End/EXEC:   %s (fl %8.8X)\n",
 862                                           walk_state->op_info->name,
 863                                           walk_state->op_info->flags));
 864
 865                         /* Executing a type1 or type2 opcode outside of a method */
 866
 867                         status = acpi_ds_exec_end_op(walk_state);
 868                         return_ACPI_STATUS(status);
 869                 }
 870 #endif
 871 #endif
 872                 return_ACPI_STATUS(AE_OK);
 873         }
 874
 875         if (op->common.aml_opcode == AML_SCOPE_OP) {
 876                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 877                                   "Ending scope Op=%p State=%p\n", op,
 878                                   walk_state));
 879         }
 880
 881         object_type = walk_state->op_info->object_type;
 882
 883         /*
 884          * Get the Node/name from the earlier lookup
 885          * (It was saved in the *op structure)
 886          */
 887         node = op->common.node;
 888
 889         /*
 890          * Put the Node on the object stack (Contains the ACPI Name of
 891          * this object)
 892          */
 893         walk_state->operands[0] = (void *)node;
 894         walk_state->num_operands = 1;
 895
 896         /* Pop the scope stack */
 897
 898         if (acpi_ns_opens_scope(object_type) &&
 899             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 900                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 901                                   "(%s) Popping scope for Op %p\n",
 902                                   acpi_ut_get_type_name(object_type), op));
 903
 904                 status = acpi_ds_scope_stack_pop(walk_state);
 905                 if (ACPI_FAILURE(status)) {
 906                         goto cleanup;
 907                 }
 908         }
 909
 910         /*
 911          * Named operations are as follows:
 912          *
 913          * AML_ALIAS
 914          * AML_BANKFIELD
 915          * AML_CREATEBITFIELD
 916          * AML_CREATEBYTEFIELD
 917          * AML_CREATEDWORDFIELD
 918          * AML_CREATEFIELD
 919          * AML_CREATEQWORDFIELD
 920          * AML_CREATEWORDFIELD
 921          * AML_DATA_REGION
 922          * AML_DEVICE
 923          * AML_EVENT
 924          * AML_FIELD
 925          * AML_INDEXFIELD
 926          * AML_METHOD
 927          * AML_METHODCALL
 928          * AML_MUTEX
 929          * AML_NAME
 930          * AML_NAMEDFIELD
 931          * AML_OPREGION
 932          * AML_POWERRES
 933          * AML_PROCESSOR
 934          * AML_SCOPE
 935          * AML_THERMALZONE
 936          */
 937
 938         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 939                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 940                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 941                           walk_state, op, node));
 942
 943         /* Decode the opcode */
 944
 945         arg = op->common.value.arg;
 946
 947         switch (walk_state->op_info->type) {
 948 #ifndef ACPI_NO_METHOD_EXECUTION
 949
 950         case AML_TYPE_CREATE_FIELD:
 951                 /*
 952                  * Create the field object, but the field buffer and index must
 953                  * be evaluated later during the execution phase
 954                  */
 955                 status = acpi_ds_create_buffer_field(op, walk_state);
 956                 break;
 957
 958         case AML_TYPE_NAMED_FIELD:
 959                 /*
 960                  * If we are executing a method, initialize the field
 961                  */
 962                 if (walk_state->method_node) {
 963                         status = acpi_ds_init_field_objects(op, walk_state);
 964                 }
 965
 966                 switch (op->common.aml_opcode) {
 967                 case AML_INDEX_FIELD_OP:
 968
 969                         status =
 970                             acpi_ds_create_index_field(op,
 971                                                        (acpi_handle) arg->
 972                                                        common.node, walk_state);
 973                         break;
 974
 975                 case AML_BANK_FIELD_OP:
 976
 977                         status =
 978                             acpi_ds_create_bank_field(op, arg->common.node,
 979                                                       walk_state);
 980                         break;
 981
 982                 case AML_FIELD_OP:
 983
 984                         status =
 985                             acpi_ds_create_field(op, arg->common.node,
 986                                                  walk_state);
 987                         break;
 988
 989                 default:
 990                         /* All NAMED_FIELD opcodes must be handled above */
 991                         break;
 992                 }
 993                 break;
 994
 995         case AML_TYPE_NAMED_SIMPLE:
 996
 997                 status = acpi_ds_create_operands(walk_state, arg);
 998                 if (ACPI_FAILURE(status)) {
 999                         goto cleanup;
1000                 }
1001
1002                 switch (op->common.aml_opcode) {
1003                 case AML_PROCESSOR_OP:
1004
1005                         status = acpi_ex_create_processor(walk_state);
1006                         break;
1007
1008                 case AML_POWER_RES_OP:
1009
1010                         status = acpi_ex_create_power_resource(walk_state);
1011                         break;
1012
1013                 case AML_MUTEX_OP:
1014
1015                         status = acpi_ex_create_mutex(walk_state);
1016                         break;
1017
1018                 case AML_EVENT_OP:
1019
1020                         status = acpi_ex_create_event(walk_state);
1021                         break;
1022
1023                 case AML_ALIAS_OP:
1024
1025                         status = acpi_ex_create_alias(walk_state);
1026                         break;
1027
1028                 default:
1029                         /* Unknown opcode */
1030
1031                         status = AE_OK;
1032                         goto cleanup;
1033                 }
1034
1035                 /* Delete operands */
1036
1037                 for (i = 1; i < walk_state->num_operands; i++) {
1038                         acpi_ut_remove_reference(walk_state->operands[i]);
1039                         walk_state->operands[i] = NULL;
1040                 }
1041
1042                 break;
1043 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1044
1045         case AML_TYPE_NAMED_COMPLEX:
1046
1047                 switch (op->common.aml_opcode) {
1048 #ifndef ACPI_NO_METHOD_EXECUTION
1049                 case AML_REGION_OP:
1050                 case AML_DATA_REGION_OP:
1051
1052                         if (op->common.aml_opcode == AML_REGION_OP) {
1053                                 region_space = (acpi_adr_space_type)
1054                                     ((op->common.value.arg)->common.value.
1055                                      integer);
1056                         } else {
1057                                 region_space = REGION_DATA_TABLE;
1058                         }
1059
1060                         /*
1061                          * If we are executing a method, initialize the region
1062                          */
1063                         if (walk_state->method_node) {
1064                                 status =
1065                                     acpi_ex_create_region(op->named.data,
1066                                                           op->named.length,
1067                                                           region_space,
1068                                                           walk_state);
1069                                 if (ACPI_FAILURE(status)) {
1070                                         return (status);
1071                                 }
1072                         }
1073
1074                         /*
1075                          * The op_region is not fully parsed at this time. Only valid
1076                          * argument is the space_id. (We must save the address of the
1077                          * AML of the address and length operands)
1078                          */
1079
1080                         /*
1081                          * If we have a valid region, initialize it
1082                          * Namespace is NOT locked at this point.
1083                          */
1084                         status =
1085                             acpi_ev_initialize_region
1086                             (acpi_ns_get_attached_object(node), FALSE);
1087                         if (ACPI_FAILURE(status)) {
1088                                 /*
1089                                  *  If AE_NOT_EXIST is returned, it is not fatal
1090                                  *  because many regions get created before a handler
1091                                  *  is installed for said region.
1092                                  */
1093                                 if (AE_NOT_EXIST == status) {
1094                                         status = AE_OK;
1095                                 }
1096                         }
1097                         break;
1098
1099                 case AML_NAME_OP:
1100
1101                         status = acpi_ds_create_node(walk_state, node, op);
1102                         break;
1103
1104                 case AML_METHOD_OP:
1105                         /*
1106                          * method_op pkg_length name_string method_flags term_list
1107                          *
1108                          * Note: We must create the method node/object pair as soon as we
1109                          * see the method declaration. This allows later pass1 parsing
1110                          * of invocations of the method (need to know the number of
1111                          * arguments.)
1112                          */
1113                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1114                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
1115                                           walk_state, op, op->named.node));
1116
1117                         if (!acpi_ns_get_attached_object(op->named.node)) {
1118                                 walk_state->operands[0] =
1119                                     ACPI_CAST_PTR(void, op->named.node);
1120                                 walk_state->num_operands = 1;
1121
1122                                 status =
1123                                     acpi_ds_create_operands(walk_state,
1124                                                             op->common.value.
1125                                                             arg);
1126                                 if (ACPI_SUCCESS(status)) {
1127                                         status =
1128                                             acpi_ex_create_method(op->named.
1129                                                                   data,
1130                                                                   op->named.
1131                                                                   length,
1132                                                                   walk_state);
1133                                 }
1134                                 walk_state->operands[0] = NULL;
1135                                 walk_state->num_operands = 0;
1136
1137                                 if (ACPI_FAILURE(status)) {
1138                                         return_ACPI_STATUS(status);
1139                                 }
1140                         }
1141                         break;
1142
1143 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1144
1145                 default:
1146                         /* All NAMED_COMPLEX opcodes must be handled above */
1147                         break;
1148                 }
1149                 break;
1150
1151         case AML_CLASS_INTERNAL:
1152
1153                 /* case AML_INT_NAMEPATH_OP: */
1154                 break;
1155
1156         case AML_CLASS_METHOD_CALL:
1157
1158                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1159                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
1160                                   walk_state, op, node));
1161
1162                 /*
1163                  * Lookup the method name and save the Node
1164                  */
1165                 status =
1166                     acpi_ns_lookup(walk_state->scope_info,
1167                                    arg->common.value.string, ACPI_TYPE_ANY,
1168                                    ACPI_IMODE_LOAD_PASS2,
1169                                    ACPI_NS_SEARCH_PARENT |
1170                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
1171                                    &(new_node));
1172                 if (ACPI_SUCCESS(status)) {
1173                         /*
1174                          * Make sure that what we found is indeed a method
1175                          * We didn't search for a method on purpose, to see if the name
1176                          * would resolve
1177                          */
1178                         if (new_node->type != ACPI_TYPE_METHOD) {
1179                                 status = AE_AML_OPERAND_TYPE;
1180                         }
1181
1182                         /* We could put the returned object (Node) on the object stack for
1183                          * later, but for now, we will put it in the "op" object that the
1184                          * parser uses, so we can get it again at the end of this scope
1185                          */
1186                         op->common.node = new_node;
1187                 } else {
1188                         ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
1189                 }
1190                 break;
1191
1192         default:
1193                 break;
1194         }
1195
1196       cleanup:
1197
1198         /* Remove the Node pushed at the very beginning */
1199
1200         walk_state->operands[0] = NULL;
1201         walk_state->num_operands = 0;
1202         return_ACPI_STATUS(status);
1203 }