err.no 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 - 2006, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include <acpi/acparser.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acdispat.h>
  48 #include <acpi/acinterp.h>
  49 #include <acpi/acnamesp.h>
  50 #include <acpi/acevents.h>
  51
  52 #ifdef ACPI_ASL_COMPILER
  53 #include <acpi/acdisasm.h>
  54 #endif
  55
  56 #define _COMPONENT          ACPI_DISPATCHER
  57 ACPI_MODULE_NAME("dswload")
  58
  59 /*******************************************************************************
  60  *
  61  * FUNCTION:    acpi_ds_init_callbacks
  62  *
  63  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  64  *              pass_number     - 1, 2, or 3
  65  *
  66  * RETURN:      Status
  67  *
  68  * DESCRIPTION: Init walk state callbacks
  69  *
  70  ******************************************************************************/
  71 acpi_status
  72 acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
  73 {
  74
  75         switch (pass_number) {
  76         case 1:
  77                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  78                     ACPI_PARSE_DELETE_TREE;
  79                 walk_state->descending_callback = acpi_ds_load1_begin_op;
  80                 walk_state->ascending_callback = acpi_ds_load1_end_op;
  81                 break;
  82
  83         case 2:
  84                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  85                     ACPI_PARSE_DELETE_TREE;
  86                 walk_state->descending_callback = acpi_ds_load2_begin_op;
  87                 walk_state->ascending_callback = acpi_ds_load2_end_op;
  88                 break;
  89
  90         case 3:
  91 #ifndef ACPI_NO_METHOD_EXECUTION
  92                 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
  93                     ACPI_PARSE_DELETE_TREE;
  94                 walk_state->descending_callback = acpi_ds_exec_begin_op;
  95                 walk_state->ascending_callback = acpi_ds_exec_end_op;
  96 #endif
  97                 break;
  98
  99         default:
 100                 return (AE_BAD_PARAMETER);
 101         }
 102
 103         return (AE_OK);
 104 }
 105
 106 /*******************************************************************************
 107  *
 108  * FUNCTION:    acpi_ds_load1_begin_op
 109  *
 110  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 111  *              out_op          - Where to return op if a new one is created
 112  *
 113  * RETURN:      Status
 114  *
 115  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 116  *
 117  ******************************************************************************/
 118
 119 acpi_status
 120 acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 121                        union acpi_parse_object ** out_op)
 122 {
 123         union acpi_parse_object *op;
 124         struct acpi_namespace_node *node;
 125         acpi_status status;
 126         acpi_object_type object_type;
 127         char *path;
 128         u32 flags;
 129
 130         ACPI_FUNCTION_TRACE(ds_load1_begin_op);
 131
 132         op = walk_state->op;
 133         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 134                           walk_state));
 135
 136         /* We are only interested in opcodes that have an associated name */
 137
 138         if (op) {
 139                 if (!(walk_state->op_info->flags & AML_NAMED)) {
 140                         *out_op = op;
 141                         return_ACPI_STATUS(AE_OK);
 142                 }
 143
 144                 /* Check if this object has already been installed in the namespace */
 145
 146                 if (op->common.node) {
 147                         *out_op = op;
 148                         return_ACPI_STATUS(AE_OK);
 149                 }
 150         }
 151
 152         path = acpi_ps_get_next_namestring(&walk_state->parser_state);
 153
 154         /* Map the raw opcode into an internal object type */
 155
 156         object_type = walk_state->op_info->object_type;
 157
 158         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 159                           "State=%p Op=%p [%s]\n", walk_state, op,
 160                           acpi_ut_get_type_name(object_type)));
 161
 162         switch (walk_state->opcode) {
 163         case AML_SCOPE_OP:
 164
 165                 /*
 166                  * The target name of the Scope() operator must exist at this point so
 167                  * that we can actually open the scope to enter new names underneath it.
 168                  * Allow search-to-root for single namesegs.
 169                  */
 170                 status =
 171                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 172                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 173                                    walk_state, &(node));
 174 #ifdef ACPI_ASL_COMPILER
 175                 if (status == AE_NOT_FOUND) {
 176                         /*
 177                          * Table disassembly:
 178                          * Target of Scope() not found. Generate an External for it, and
 179                          * insert the name into the namespace.
 180                          */
 181                         acpi_dm_add_to_external_list(path, ACPI_TYPE_DEVICE, 0);
 182                         status =
 183                             acpi_ns_lookup(walk_state->scope_info, path,
 184                                            object_type, ACPI_IMODE_LOAD_PASS1,
 185                                            ACPI_NS_SEARCH_PARENT, walk_state,
 186                                            &node);
 187                 }
 188 #endif
 189                 if (ACPI_FAILURE(status)) {
 190                         ACPI_ERROR_NAMESPACE(path, status);
 191                         return_ACPI_STATUS(status);
 192                 }
 193
 194                 /*
 195                  * Check to make sure that the target is
 196                  * one of the opcodes that actually opens a scope
 197                  */
 198                 switch (node->type) {
 199                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope  */
 200                 case ACPI_TYPE_DEVICE:
 201                 case ACPI_TYPE_POWER:
 202                 case ACPI_TYPE_PROCESSOR:
 203                 case ACPI_TYPE_THERMAL:
 204
 205                         /* These are acceptable types */
 206                         break;
 207
 208                 case ACPI_TYPE_INTEGER:
 209                 case ACPI_TYPE_STRING:
 210                 case ACPI_TYPE_BUFFER:
 211
 212                         /*
 213                          * These types we will allow, but we will change the type. This
 214                          * enables some existing code of the form:
 215                          *
 216                          *  Name (DEB, 0)
 217                          *  Scope (DEB) { ... }
 218                          *
 219                          * Note: silently change the type here. On the second pass, we will report
 220                          * a warning
 221                          */
 222                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 223                                           "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)\n",
 224                                           path,
 225                                           acpi_ut_get_type_name(node->type)));
 226
 227                         node->type = ACPI_TYPE_ANY;
 228                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 229                         break;
 230
 231                 default:
 232
 233                         /* All other types are an error */
 234
 235                         ACPI_ERROR((AE_INFO,
 236                                     "Invalid type (%s) for target of Scope operator [%4.4s] (Cannot override)",
 237                                     acpi_ut_get_type_name(node->type), path));
 238
 239                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 240                 }
 241                 break;
 242
 243         default:
 244                 /*
 245                  * For all other named opcodes, we will enter the name into
 246                  * the namespace.
 247                  *
 248                  * Setup the search flags.
 249                  * Since we are entering a name into the namespace, we do not want to
 250                  * enable the search-to-root upsearch.
 251                  *
 252                  * There are only two conditions where it is acceptable that the name
 253                  * already exists:
 254                  *    1) the Scope() operator can reopen a scoping object that was
 255                  *       previously defined (Scope, Method, Device, etc.)
 256                  *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
 257                  *       buffer_field, or Package), the name of the object is already
 258                  *       in the namespace.
 259                  */
 260                 if (walk_state->deferred_node) {
 261
 262                         /* This name is already in the namespace, get the node */
 263
 264                         node = walk_state->deferred_node;
 265                         status = AE_OK;
 266                         break;
 267                 }
 268
 269                 /*
 270                  * If we are executing a method, do not create any namespace objects
 271                  * during the load phase, only during execution.
 272                  */
 273                 if (walk_state->method_node) {
 274                         node = NULL;
 275                         status = AE_OK;
 276                         break;
 277                 }
 278
 279                 flags = ACPI_NS_NO_UPSEARCH;
 280                 if ((walk_state->opcode != AML_SCOPE_OP) &&
 281                     (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
 282                         flags |= ACPI_NS_ERROR_IF_FOUND;
 283                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 284                                           "[%s] Cannot already exist\n",
 285                                           acpi_ut_get_type_name(object_type)));
 286                 } else {
 287                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 288                                           "[%s] Both Find or Create allowed\n",
 289                                           acpi_ut_get_type_name(object_type)));
 290                 }
 291
 292                 /*
 293                  * Enter the named type into the internal namespace. We enter the name
 294                  * as we go downward in the parse tree. Any necessary subobjects that
 295                  * involve arguments to the opcode must be created as we go back up the
 296                  * parse tree later.
 297                  */
 298                 status =
 299                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 300                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
 301                                    &node);
 302                 if (ACPI_FAILURE(status)) {
 303                         if (status == AE_ALREADY_EXISTS) {
 304
 305                                 /* The name already exists in this scope */
 306
 307                                 if (node->flags & ANOBJ_IS_EXTERNAL) {
 308                                         /*
 309                                          * Allow one create on an object or segment that was
 310                                          * previously declared External
 311                                          */
 312                                         node->flags &= ~ANOBJ_IS_EXTERNAL;
 313                                         node->type = (u8) object_type;
 314
 315                                         /* Just retyped a node, probably will need to open a scope */
 316
 317                                         if (acpi_ns_opens_scope(object_type)) {
 318                                                 status =
 319                                                     acpi_ds_scope_stack_push
 320                                                     (node, object_type,
 321                                                      walk_state);
 322                                                 if (ACPI_FAILURE(status)) {
 323                                                         return_ACPI_STATUS
 324                                                             (status);
 325                                                 }
 326                                         }
 327
 328                                         status = AE_OK;
 329                                 }
 330                         }
 331
 332                         if (ACPI_FAILURE(status)) {
 333                                 ACPI_ERROR_NAMESPACE(path, status);
 334                                 return_ACPI_STATUS(status);
 335                         }
 336                 }
 337                 break;
 338         }
 339
 340         /* Common exit */
 341
 342         if (!op) {
 343
 344                 /* Create a new op */
 345
 346                 op = acpi_ps_alloc_op(walk_state->opcode);
 347                 if (!op) {
 348                         return_ACPI_STATUS(AE_NO_MEMORY);
 349                 }
 350         }
 351
 352         /* Initialize the op */
 353
 354 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
 355         op->named.path = ACPI_CAST_PTR(u8, path);
 356 #endif
 357
 358         if (node) {
 359                 /*
 360                  * Put the Node in the "op" object that the parser uses, so we
 361                  * can get it again quickly when this scope is closed
 362                  */
 363                 op->common.node = node;
 364                 op->named.name = node->name.integer;
 365         }
 366
 367         acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
 368                            op);
 369         *out_op = op;
 370         return_ACPI_STATUS(status);
 371 }
 372
 373 /*******************************************************************************
 374  *
 375  * FUNCTION:    acpi_ds_load1_end_op
 376  *
 377  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 378  *
 379  * RETURN:      Status
 380  *
 381  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 382  *              both control methods and everything else.
 383  *
 384  ******************************************************************************/
 385
 386 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 387 {
 388         union acpi_parse_object *op;
 389         acpi_object_type object_type;
 390         acpi_status status = AE_OK;
 391
 392         ACPI_FUNCTION_TRACE(ds_load1_end_op);
 393
 394         op = walk_state->op;
 395         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 396                           walk_state));
 397
 398         /* We are only interested in opcodes that have an associated name */
 399
 400         if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
 401                 return_ACPI_STATUS(AE_OK);
 402         }
 403
 404         /* Get the object type to determine if we should pop the scope */
 405
 406         object_type = walk_state->op_info->object_type;
 407
 408 #ifndef ACPI_NO_METHOD_EXECUTION
 409         if (walk_state->op_info->flags & AML_FIELD) {
 410                 /*
 411                  * If we are executing a method, do not create any namespace objects
 412                  * during the load phase, only during execution.
 413                  */
 414                 if (!walk_state->method_node) {
 415                         if (walk_state->opcode == AML_FIELD_OP ||
 416                             walk_state->opcode == AML_BANK_FIELD_OP ||
 417                             walk_state->opcode == AML_INDEX_FIELD_OP) {
 418                                 status =
 419                                     acpi_ds_init_field_objects(op, walk_state);
 420                         }
 421                 }
 422                 return_ACPI_STATUS(status);
 423         }
 424
 425         /*
 426          * If we are executing a method, do not create any namespace objects
 427          * during the load phase, only during execution.
 428          */
 429         if (!walk_state->method_node) {
 430                 if (op->common.aml_opcode == AML_REGION_OP) {
 431                         status =
 432                             acpi_ex_create_region(op->named.data,
 433                                                   op->named.length,
 434                                                   (acpi_adr_space_type) ((op->
 435                                                                           common.
 436                                                                           value.
 437                                                                           arg)->
 438                                                                          common.
 439                                                                          value.
 440                                                                          integer),
 441                                                   walk_state);
 442                         if (ACPI_FAILURE(status)) {
 443                                 return_ACPI_STATUS(status);
 444                         }
 445                 }
 446         }
 447 #endif
 448
 449         if (op->common.aml_opcode == AML_NAME_OP) {
 450
 451                 /* For Name opcode, get the object type from the argument */
 452
 453                 if (op->common.value.arg) {
 454                         object_type = (acpi_ps_get_opcode_info((op->common.
 455                                                                 value.arg)->
 456                                                                common.
 457                                                                aml_opcode))->
 458                             object_type;
 459
 460                         /* Set node type if we have a namespace node */
 461
 462                         if (op->common.node) {
 463                                 op->common.node->type = (u8) object_type;
 464                         }
 465                 }
 466         }
 467
 468         /*
 469          * If we are executing a method, do not create any namespace objects
 470          * during the load phase, only during execution.
 471          */
 472         if (!walk_state->method_node) {
 473                 if (op->common.aml_opcode == AML_METHOD_OP) {
 474                         /*
 475                          * method_op pkg_length name_string method_flags term_list
 476                          *
 477                          * Note: We must create the method node/object pair as soon as we
 478                          * see the method declaration. This allows later pass1 parsing
 479                          * of invocations of the method (need to know the number of
 480                          * arguments.)
 481                          */
 482                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 483                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 484                                           walk_state, op, op->named.node));
 485
 486                         if (!acpi_ns_get_attached_object(op->named.node)) {
 487                                 walk_state->operands[0] =
 488                                     ACPI_CAST_PTR(void, op->named.node);
 489                                 walk_state->num_operands = 1;
 490
 491                                 status =
 492                                     acpi_ds_create_operands(walk_state,
 493                                                             op->common.value.
 494                                                             arg);
 495                                 if (ACPI_SUCCESS(status)) {
 496                                         status =
 497                                             acpi_ex_create_method(op->named.
 498                                                                   data,
 499                                                                   op->named.
 500                                                                   length,
 501                                                                   walk_state);
 502                                 }
 503
 504                                 walk_state->operands[0] = NULL;
 505                                 walk_state->num_operands = 0;
 506
 507                                 if (ACPI_FAILURE(status)) {
 508                                         return_ACPI_STATUS(status);
 509                                 }
 510                         }
 511                 }
 512         }
 513
 514         /* Pop the scope stack (only if loading a table) */
 515
 516         if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
 517                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 518                                   "(%s): Popping scope for Op %p\n",
 519                                   acpi_ut_get_type_name(object_type), op));
 520
 521                 status = acpi_ds_scope_stack_pop(walk_state);
 522         }
 523
 524         return_ACPI_STATUS(status);
 525 }
 526
 527 /*******************************************************************************
 528  *
 529  * FUNCTION:    acpi_ds_load2_begin_op
 530  *
 531  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 532  *              out_op          - Wher to return op if a new one is created
 533  *
 534  * RETURN:      Status
 535  *
 536  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 537  *
 538  ******************************************************************************/
 539
 540 acpi_status
 541 acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 542                        union acpi_parse_object **out_op)
 543 {
 544         union acpi_parse_object *op;
 545         struct acpi_namespace_node *node;
 546         acpi_status status;
 547         acpi_object_type object_type;
 548         char *buffer_ptr;
 549
 550         ACPI_FUNCTION_TRACE(ds_load2_begin_op);
 551
 552         op = walk_state->op;
 553         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 554                           walk_state));
 555
 556         if (op) {
 557                 if ((walk_state->control_state) &&
 558                     (walk_state->control_state->common.state ==
 559                      ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 560
 561                         /* We are executing a while loop outside of a method */
 562
 563                         status = acpi_ds_exec_begin_op(walk_state, out_op);
 564                         return_ACPI_STATUS(status);
 565                 }
 566
 567                 /* We only care about Namespace opcodes here */
 568
 569                 if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
 570                      (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
 571                     (!(walk_state->op_info->flags & AML_NAMED))) {
 572 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 573                         if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 574                             (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 575                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 576                                                   "Begin/EXEC: %s (fl %8.8X)\n",
 577                                                   walk_state->op_info->name,
 578                                                   walk_state->op_info->flags));
 579
 580                                 /* Executing a type1 or type2 opcode outside of a method */
 581
 582                                 status =
 583                                     acpi_ds_exec_begin_op(walk_state, out_op);
 584                                 return_ACPI_STATUS(status);
 585                         }
 586 #endif
 587                         return_ACPI_STATUS(AE_OK);
 588                 }
 589
 590                 /* Get the name we are going to enter or lookup in the namespace */
 591
 592                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 593
 594                         /* For Namepath op, get the path string */
 595
 596                         buffer_ptr = op->common.value.string;
 597                         if (!buffer_ptr) {
 598
 599                                 /* No name, just exit */
 600
 601                                 return_ACPI_STATUS(AE_OK);
 602                         }
 603                 } else {
 604                         /* Get name from the op */
 605
 606                         buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
 607                 }
 608         } else {
 609                 /* Get the namestring from the raw AML */
 610
 611                 buffer_ptr =
 612                     acpi_ps_get_next_namestring(&walk_state->parser_state);
 613         }
 614
 615         /* Map the opcode into an internal object type */
 616
 617         object_type = walk_state->op_info->object_type;
 618
 619         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 620                           "State=%p Op=%p Type=%X\n", walk_state, op,
 621                           object_type));
 622
 623         switch (walk_state->opcode) {
 624         case AML_FIELD_OP:
 625         case AML_BANK_FIELD_OP:
 626         case AML_INDEX_FIELD_OP:
 627
 628                 node = NULL;
 629                 status = AE_OK;
 630                 break;
 631
 632         case AML_INT_NAMEPATH_OP:
 633                 /*
 634                  * The name_path is an object reference to an existing object.
 635                  * Don't enter the name into the namespace, but look it up
 636                  * for use later.
 637                  */
 638                 status =
 639                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 640                                    object_type, ACPI_IMODE_EXECUTE,
 641                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 642                 break;
 643
 644         case AML_SCOPE_OP:
 645                 /*
 646                  * The 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                 if (ACPI_FAILURE(status)) {
 655 #ifdef ACPI_ASL_COMPILER
 656                         if (status == AE_NOT_FOUND) {
 657                                 status = AE_OK;
 658                         } else {
 659                                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 660                         }
 661 #else
 662                         ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 663 #endif
 664                         return_ACPI_STATUS(status);
 665                 }
 666
 667                 /*
 668                  * We must check to make sure that the target is
 669                  * one of the opcodes that actually opens a scope
 670                  */
 671                 switch (node->type) {
 672                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 673                 case ACPI_TYPE_DEVICE:
 674                 case ACPI_TYPE_POWER:
 675                 case ACPI_TYPE_PROCESSOR:
 676                 case ACPI_TYPE_THERMAL:
 677
 678                         /* These are acceptable types */
 679                         break;
 680
 681                 case ACPI_TYPE_INTEGER:
 682                 case ACPI_TYPE_STRING:
 683                 case ACPI_TYPE_BUFFER:
 684
 685                         /*
 686                          * These types we will allow, but we will change the type. This
 687                          * enables some existing code of the form:
 688                          *
 689                          *  Name (DEB, 0)
 690                          *  Scope (DEB) { ... }
 691                          */
 692                         ACPI_WARNING((AE_INFO,
 693                                       "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)",
 694                                       buffer_ptr,
 695                                       acpi_ut_get_type_name(node->type)));
 696
 697                         node->type = ACPI_TYPE_ANY;
 698                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 699                         break;
 700
 701                 default:
 702
 703                         /* All other types are an error */
 704
 705                         ACPI_ERROR((AE_INFO,
 706                                     "Invalid type (%s) for target of Scope operator [%4.4s]",
 707                                     acpi_ut_get_type_name(node->type),
 708                                     buffer_ptr));
 709
 710                         return (AE_AML_OPERAND_TYPE);
 711                 }
 712                 break;
 713
 714         default:
 715
 716                 /* All other opcodes */
 717
 718                 if (op && op->common.node) {
 719
 720                         /* This op/node was previously entered into the namespace */
 721
 722                         node = op->common.node;
 723
 724                         if (acpi_ns_opens_scope(object_type)) {
 725                                 status =
 726                                     acpi_ds_scope_stack_push(node, object_type,
 727                                                              walk_state);
 728                                 if (ACPI_FAILURE(status)) {
 729                                         return_ACPI_STATUS(status);
 730                                 }
 731                         }
 732
 733                         return_ACPI_STATUS(AE_OK);
 734                 }
 735
 736                 /*
 737                  * Enter the named type into the internal namespace. We enter the name
 738                  * as we go downward in the parse tree. Any necessary subobjects that
 739                  * involve arguments to the opcode must be created as we go back up the
 740                  * parse tree later.
 741                  *
 742                  * Note: Name may already exist if we are executing a deferred opcode.
 743                  */
 744                 if (walk_state->deferred_node) {
 745
 746                         /* This name is already in the namespace, get the node */
 747
 748                         node = walk_state->deferred_node;
 749                         status = AE_OK;
 750                         break;
 751                 }
 752
 753                 /* Add new entry into namespace */
 754
 755                 status =
 756                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 757                                    object_type, ACPI_IMODE_LOAD_PASS2,
 758                                    ACPI_NS_NO_UPSEARCH, walk_state, &(node));
 759                 break;
 760         }
 761
 762         if (ACPI_FAILURE(status)) {
 763                 ACPI_ERROR_NAMESPACE(buffer_ptr, status);
 764                 return_ACPI_STATUS(status);
 765         }
 766
 767         if (!op) {
 768
 769                 /* Create a new op */
 770
 771                 op = acpi_ps_alloc_op(walk_state->opcode);
 772                 if (!op) {
 773                         return_ACPI_STATUS(AE_NO_MEMORY);
 774                 }
 775
 776                 /* Initialize the new op */
 777
 778                 if (node) {
 779                         op->named.name = node->name.integer;
 780                 }
 781                 *out_op = op;
 782         }
 783
 784         /*
 785          * Put the Node in the "op" object that the parser uses, so we
 786          * can get it again quickly when this scope is closed
 787          */
 788         op->common.node = node;
 789         return_ACPI_STATUS(status);
 790 }
 791
 792 /*******************************************************************************
 793  *
 794  * FUNCTION:    acpi_ds_load2_end_op
 795  *
 796  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 797  *
 798  * RETURN:      Status
 799  *
 800  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 801  *              both control methods and everything else.
 802  *
 803  ******************************************************************************/
 804
 805 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 806 {
 807         union acpi_parse_object *op;
 808         acpi_status status = AE_OK;
 809         acpi_object_type object_type;
 810         struct acpi_namespace_node *node;
 811         union acpi_parse_object *arg;
 812         struct acpi_namespace_node *new_node;
 813 #ifndef ACPI_NO_METHOD_EXECUTION
 814         u32 i;
 815 #endif
 816
 817         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 818
 819         op = walk_state->op;
 820         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 821                           walk_state->op_info->name, op, walk_state));
 822
 823         /* Check if opcode had an associated namespace object */
 824
 825         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 826 #ifndef ACPI_NO_METHOD_EXECUTION
 827 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 828                 /* No namespace object. Executable opcode? */
 829
 830                 if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 831                     (walk_state->op_info->class == AML_CLASS_CONTROL)) {
 832                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 833                                           "End/EXEC:   %s (fl %8.8X)\n",
 834                                           walk_state->op_info->name,
 835                                           walk_state->op_info->flags));
 836
 837                         /* Executing a type1 or type2 opcode outside of a method */
 838
 839                         status = acpi_ds_exec_end_op(walk_state);
 840                         return_ACPI_STATUS(status);
 841                 }
 842 #endif
 843 #endif
 844                 return_ACPI_STATUS(AE_OK);
 845         }
 846
 847         if (op->common.aml_opcode == AML_SCOPE_OP) {
 848                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 849                                   "Ending scope Op=%p State=%p\n", op,
 850                                   walk_state));
 851         }
 852
 853         object_type = walk_state->op_info->object_type;
 854
 855         /*
 856          * Get the Node/name from the earlier lookup
 857          * (It was saved in the *op structure)
 858          */
 859         node = op->common.node;
 860
 861         /*
 862          * Put the Node on the object stack (Contains the ACPI Name of
 863          * this object)
 864          */
 865         walk_state->operands[0] = (void *)node;
 866         walk_state->num_operands = 1;
 867
 868         /* Pop the scope stack */
 869
 870         if (acpi_ns_opens_scope(object_type) &&
 871             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 872                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 873                                   "(%s) Popping scope for Op %p\n",
 874                                   acpi_ut_get_type_name(object_type), op));
 875
 876                 status = acpi_ds_scope_stack_pop(walk_state);
 877                 if (ACPI_FAILURE(status)) {
 878                         goto cleanup;
 879                 }
 880         }
 881
 882         /*
 883          * Named operations are as follows:
 884          *
 885          * AML_ALIAS
 886          * AML_BANKFIELD
 887          * AML_CREATEBITFIELD
 888          * AML_CREATEBYTEFIELD
 889          * AML_CREATEDWORDFIELD
 890          * AML_CREATEFIELD
 891          * AML_CREATEQWORDFIELD
 892          * AML_CREATEWORDFIELD
 893          * AML_DATA_REGION
 894          * AML_DEVICE
 895          * AML_EVENT
 896          * AML_FIELD
 897          * AML_INDEXFIELD
 898          * AML_METHOD
 899          * AML_METHODCALL
 900          * AML_MUTEX
 901          * AML_NAME
 902          * AML_NAMEDFIELD
 903          * AML_OPREGION
 904          * AML_POWERRES
 905          * AML_PROCESSOR
 906          * AML_SCOPE
 907          * AML_THERMALZONE
 908          */
 909
 910         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 911                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 912                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 913                           walk_state, op, node));
 914
 915         /* Decode the opcode */
 916
 917         arg = op->common.value.arg;
 918
 919         switch (walk_state->op_info->type) {
 920 #ifndef ACPI_NO_METHOD_EXECUTION
 921
 922         case AML_TYPE_CREATE_FIELD:
 923                 /*
 924                  * Create the field object, but the field buffer and index must
 925                  * be evaluated later during the execution phase
 926                  */
 927                 status = acpi_ds_create_buffer_field(op, walk_state);
 928                 break;
 929
 930         case AML_TYPE_NAMED_FIELD:
 931                 /*
 932                  * If we are executing a method, initialize the field
 933                  */
 934                 if (walk_state->method_node) {
 935                         status = acpi_ds_init_field_objects(op, walk_state);
 936                 }
 937
 938                 switch (op->common.aml_opcode) {
 939                 case AML_INDEX_FIELD_OP:
 940
 941                         status =
 942                             acpi_ds_create_index_field(op,
 943                                                        (acpi_handle) arg->
 944                                                        common.node, walk_state);
 945                         break;
 946
 947                 case AML_BANK_FIELD_OP:
 948
 949                         status =
 950                             acpi_ds_create_bank_field(op, arg->common.node,
 951                                                       walk_state);
 952                         break;
 953
 954                 case AML_FIELD_OP:
 955
 956                         status =
 957                             acpi_ds_create_field(op, arg->common.node,
 958                                                  walk_state);
 959                         break;
 960
 961                 default:
 962                         /* All NAMED_FIELD opcodes must be handled above */
 963                         break;
 964                 }
 965                 break;
 966
 967         case AML_TYPE_NAMED_SIMPLE:
 968
 969                 status = acpi_ds_create_operands(walk_state, arg);
 970                 if (ACPI_FAILURE(status)) {
 971                         goto cleanup;
 972                 }
 973
 974                 switch (op->common.aml_opcode) {
 975                 case AML_PROCESSOR_OP:
 976
 977                         status = acpi_ex_create_processor(walk_state);
 978                         break;
 979
 980                 case AML_POWER_RES_OP:
 981
 982                         status = acpi_ex_create_power_resource(walk_state);
 983                         break;
 984
 985                 case AML_MUTEX_OP:
 986
 987                         status = acpi_ex_create_mutex(walk_state);
 988                         break;
 989
 990                 case AML_EVENT_OP:
 991
 992                         status = acpi_ex_create_event(walk_state);
 993                         break;
 994
 995                 case AML_DATA_REGION_OP:
 996
 997                         status = acpi_ex_create_table_region(walk_state);
 998                         break;
 999
1000                 case AML_ALIAS_OP:
1001
1002                         status = acpi_ex_create_alias(walk_state);
1003                         break;
1004
1005                 default:
1006                         /* Unknown opcode */
1007
1008                         status = AE_OK;
1009                         goto cleanup;
1010                 }
1011
1012                 /* Delete operands */
1013
1014                 for (i = 1; i < walk_state->num_operands; i++) {
1015                         acpi_ut_remove_reference(walk_state->operands[i]);
1016                         walk_state->operands[i] = NULL;
1017                 }
1018
1019                 break;
1020 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1021
1022         case AML_TYPE_NAMED_COMPLEX:
1023
1024                 switch (op->common.aml_opcode) {
1025 #ifndef ACPI_NO_METHOD_EXECUTION
1026                 case AML_REGION_OP:
1027
1028                         /*
1029                          * If we are executing a method, initialize the region
1030                          */
1031                         if (walk_state->method_node) {
1032                                 status =
1033                                     acpi_ex_create_region(op->named.data,
1034                                                           op->named.length,
1035                                                           (acpi_adr_space_type)
1036                                                           ((op->common.value.
1037                                                             arg)->common.value.
1038                                                            integer),
1039                                                           walk_state);
1040                                 if (ACPI_FAILURE(status)) {
1041                                         return (status);
1042                                 }
1043                         }
1044
1045                         /*
1046                          * The op_region is not fully parsed at this time. Only valid
1047                          * argument is the space_id. (We must save the address of the
1048                          * AML of the address and length operands)
1049                          */
1050
1051                         /*
1052                          * If we have a valid region, initialize it
1053                          * Namespace is NOT locked at this point.
1054                          */
1055                         status =
1056                             acpi_ev_initialize_region
1057                             (acpi_ns_get_attached_object(node), FALSE);
1058                         if (ACPI_FAILURE(status)) {
1059                                 /*
1060                                  *  If AE_NOT_EXIST is returned, it is not fatal
1061                                  *  because many regions get created before a handler
1062                                  *  is installed for said region.
1063                                  */
1064                                 if (AE_NOT_EXIST == status) {
1065                                         status = AE_OK;
1066                                 }
1067                         }
1068                         break;
1069
1070                 case AML_NAME_OP:
1071
1072                         status = acpi_ds_create_node(walk_state, node, op);
1073                         break;
1074
1075                 case AML_METHOD_OP:
1076                         /*
1077                          * method_op pkg_length name_string method_flags term_list
1078                          *
1079                          * Note: We must create the method node/object pair as soon as we
1080                          * see the method declaration. This allows later pass1 parsing
1081                          * of invocations of the method (need to know the number of
1082                          * arguments.)
1083                          */
1084                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1085                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
1086                                           walk_state, op, op->named.node));
1087
1088                         if (!acpi_ns_get_attached_object(op->named.node)) {
1089                                 walk_state->operands[0] =
1090                                     ACPI_CAST_PTR(void, op->named.node);
1091                                 walk_state->num_operands = 1;
1092
1093                                 status =
1094                                     acpi_ds_create_operands(walk_state,
1095                                                             op->common.value.
1096                                                             arg);
1097                                 if (ACPI_SUCCESS(status)) {
1098                                         status =
1099                                             acpi_ex_create_method(op->named.
1100                                                                   data,
1101                                                                   op->named.
1102                                                                   length,
1103                                                                   walk_state);
1104                                 }
1105                                 walk_state->operands[0] = NULL;
1106                                 walk_state->num_operands = 0;
1107
1108                                 if (ACPI_FAILURE(status)) {
1109                                         return_ACPI_STATUS(status);
1110                                 }
1111                         }
1112                         break;
1113
1114 #endif                          /* ACPI_NO_METHOD_EXECUTION */
1115
1116                 default:
1117                         /* All NAMED_COMPLEX opcodes must be handled above */
1118                         break;
1119                 }
1120                 break;
1121
1122         case AML_CLASS_INTERNAL:
1123
1124                 /* case AML_INT_NAMEPATH_OP: */
1125                 break;
1126
1127         case AML_CLASS_METHOD_CALL:
1128
1129                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1130                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
1131                                   walk_state, op, node));
1132
1133                 /*
1134                  * Lookup the method name and save the Node
1135                  */
1136                 status =
1137                     acpi_ns_lookup(walk_state->scope_info,
1138                                    arg->common.value.string, ACPI_TYPE_ANY,
1139                                    ACPI_IMODE_LOAD_PASS2,
1140                                    ACPI_NS_SEARCH_PARENT |
1141                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
1142                                    &(new_node));
1143                 if (ACPI_SUCCESS(status)) {
1144                         /*
1145                          * Make sure that what we found is indeed a method
1146                          * We didn't search for a method on purpose, to see if the name
1147                          * would resolve
1148                          */
1149                         if (new_node->type != ACPI_TYPE_METHOD) {
1150                                 status = AE_AML_OPERAND_TYPE;
1151                         }
1152
1153                         /* We could put the returned object (Node) on the object stack for
1154                          * later, but for now, we will put it in the "op" object that the
1155                          * parser uses, so we can get it again at the end of this scope
1156                          */
1157                         op->common.node = new_node;
1158                 } else {
1159                         ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
1160                 }
1161                 break;
1162
1163         default:
1164                 break;
1165         }
1166
1167       cleanup:
1168
1169         /* Remove the Node pushed at the very beginning */
1170
1171         walk_state->operands[0] = NULL;
1172         walk_state->num_operands = 0;
1173         return_ACPI_STATUS(status);
1174 }