drivers/acpi/acpica/psloop.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: psloop - Main AML parse loop
   5  *
   6  * Copyright (C) 2000 - 2019, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 /*
  11  * Parse the AML and build an operation tree as most interpreters, (such as
  12  * Perl) do. Parsing is done by hand rather than with a YACC generated parser
  13  * to tightly constrain stack and dynamic memory usage. Parsing is kept
  14  * flexible and the code fairly compact by parsing based on a list of AML
  15  * opcode templates in aml_op_info[].
  16  */
  17
  18 #include <acpi/acpi.h>
  19 #include "accommon.h"
  20 #include "acinterp.h"
  21 #include "acparser.h"
  22 #include "acdispat.h"
  23 #include "amlcode.h"
  24 #include "acconvert.h"
  25 #include "acnamesp.h"
  26
  27 #define _COMPONENT          ACPI_PARSER
  28 ACPI_MODULE_NAME("psloop")
  29
  30 /* Local prototypes */
  31 static acpi_status
  32 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
  33                       u8 * aml_op_start, union acpi_parse_object *op);
  34
  35 static void
  36 acpi_ps_link_module_code(union acpi_parse_object *parent_op,
  37                          u8 *aml_start, u32 aml_length, acpi_owner_id owner_id);
  38
  39 /*******************************************************************************
  40  *
  41  * FUNCTION:    acpi_ps_get_arguments
  42  *
  43  * PARAMETERS:  walk_state          - Current state
  44  *              aml_op_start        - Op start in AML
  45  *              op                  - Current Op
  46  *
  47  * RETURN:      Status
  48  *
  49  * DESCRIPTION: Get arguments for passed Op.
  50  *
  51  ******************************************************************************/
  52
  53 static acpi_status
  54 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
  55                       u8 * aml_op_start, union acpi_parse_object *op)
  56 {
  57         acpi_status status = AE_OK;
  58         union acpi_parse_object *arg = NULL;
  59         const struct acpi_opcode_info *op_info;
  60
  61         ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
  62
  63         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
  64                           "Get arguments for opcode [%s]\n",
  65                           op->common.aml_op_name));
  66
  67         switch (op->common.aml_opcode) {
  68         case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
  69         case AML_WORD_OP:       /* AML_WORDDATA_ARG */
  70         case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
  71         case AML_QWORD_OP:      /* AML_QWORDATA_ARG */
  72         case AML_STRING_OP:     /* AML_ASCIICHARLIST_ARG */
  73
  74                 /* Fill in constant or string argument directly */
  75
  76                 acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
  77                                             GET_CURRENT_ARG_TYPE(walk_state->
  78                                                                  arg_types),
  79                                             op);
  80                 break;
  81
  82         case AML_INT_NAMEPATH_OP:       /* AML_NAMESTRING_ARG */
  83
  84                 status = acpi_ps_get_next_namepath(walk_state,
  85                                                    &(walk_state->parser_state),
  86                                                    op,
  87                                                    ACPI_POSSIBLE_METHOD_CALL);
  88                 if (ACPI_FAILURE(status)) {
  89                         return_ACPI_STATUS(status);
  90                 }
  91
  92                 walk_state->arg_types = 0;
  93                 break;
  94
  95         default:
  96                 /*
  97                  * Op is not a constant or string, append each argument to the Op
  98                  */
  99                 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
 100                        !walk_state->arg_count) {
 101                         walk_state->aml = walk_state->parser_state.aml;
 102
 103                         switch (op->common.aml_opcode) {
 104                         case AML_METHOD_OP:
 105                         case AML_BUFFER_OP:
 106                         case AML_PACKAGE_OP:
 107                         case AML_VARIABLE_PACKAGE_OP:
 108                         case AML_WHILE_OP:
 109
 110                                 break;
 111
 112                         default:
 113
 114                                 ASL_CV_CAPTURE_COMMENTS(walk_state);
 115                                 break;
 116                         }
 117
 118                         status =
 119                             acpi_ps_get_next_arg(walk_state,
 120                                                  &(walk_state->parser_state),
 121                                                  GET_CURRENT_ARG_TYPE
 122                                                  (walk_state->arg_types), &arg);
 123                         if (ACPI_FAILURE(status)) {
 124                                 return_ACPI_STATUS(status);
 125                         }
 126
 127                         if (arg) {
 128                                 acpi_ps_append_arg(op, arg);
 129                         }
 130
 131                         INCREMENT_ARG_LIST(walk_state->arg_types);
 132                 }
 133
 134                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 135                                   "Final argument count: %8.8X pass %u\n",
 136                                   walk_state->arg_count,
 137                                   walk_state->pass_number));
 138
 139                 /*
 140                  * This case handles the legacy option that groups all module-level
 141                  * code blocks together and defers execution until all of the tables
 142                  * are loaded. Execute all of these blocks at this time.
 143                  * Execute any module-level code that was detected during the table
 144                  * load phase.
 145                  *
 146                  * Note: this option is deprecated and will be eliminated in the
 147                  * future. Use of this option can cause problems with AML code that
 148                  * depends upon in-order immediate execution of module-level code.
 149                  */
 150                 if (!acpi_gbl_execute_tables_as_methods &&
 151                     (walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) &&
 152                     ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
 153                         /*
 154                          * We want to skip If/Else/While constructs during Pass1 because we
 155                          * want to actually conditionally execute the code during Pass2.
 156                          *
 157                          * Except for disassembly, where we always want to walk the
 158                          * If/Else/While packages
 159                          */
 160                         switch (op->common.aml_opcode) {
 161                         case AML_IF_OP:
 162                         case AML_ELSE_OP:
 163                         case AML_WHILE_OP:
 164                                 /*
 165                                  * Currently supported module-level opcodes are:
 166                                  * IF/ELSE/WHILE. These appear to be the most common,
 167                                  * and easiest to support since they open an AML
 168                                  * package.
 169                                  */
 170                                 if (walk_state->pass_number ==
 171                                     ACPI_IMODE_LOAD_PASS1) {
 172                                         acpi_ps_link_module_code(op->common.
 173                                                                  parent,
 174                                                                  aml_op_start,
 175                                                                  (u32)
 176                                                                  (walk_state->
 177                                                                  parser_state.
 178                                                                  pkg_end -
 179                                                                  aml_op_start),
 180                                                                  walk_state->
 181                                                                  owner_id);
 182                                 }
 183
 184                                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 185                                                   "Pass1: Skipping an If/Else/While body\n"));
 186
 187                                 /* Skip body of if/else/while in pass 1 */
 188
 189                                 walk_state->parser_state.aml =
 190                                     walk_state->parser_state.pkg_end;
 191                                 walk_state->arg_count = 0;
 192                                 break;
 193
 194                         default:
 195                                 /*
 196                                  * Check for an unsupported executable opcode at module
 197                                  * level. We must be in PASS1, the parent must be a SCOPE,
 198                                  * The opcode class must be EXECUTE, and the opcode must
 199                                  * not be an argument to another opcode.
 200                                  */
 201                                 if ((walk_state->pass_number ==
 202                                      ACPI_IMODE_LOAD_PASS1)
 203                                     && (op->common.parent->common.aml_opcode ==
 204                                         AML_SCOPE_OP)) {
 205                                         op_info =
 206                                             acpi_ps_get_opcode_info(op->common.
 207                                                                     aml_opcode);
 208                                         if ((op_info->class ==
 209                                              AML_CLASS_EXECUTE) && (!arg)) {
 210                                                 ACPI_WARNING((AE_INFO,
 211                                                               "Unsupported module-level executable opcode "
 212                                                               "0x%.2X at table offset 0x%.4X",
 213                                                               op->common.
 214                                                               aml_opcode,
 215                                                               (u32)
 216                                                               (ACPI_PTR_DIFF
 217                                                                (aml_op_start,
 218                                                                 walk_state->
 219                                                                 parser_state.
 220                                                                 aml_start) +
 221                                                                sizeof(struct
 222                                                                       acpi_table_header))));
 223                                         }
 224                                 }
 225                                 break;
 226                         }
 227                 }
 228
 229                 /* Special processing for certain opcodes */
 230
 231                 switch (op->common.aml_opcode) {
 232                 case AML_METHOD_OP:
 233                         /*
 234                          * Skip parsing of control method because we don't have enough
 235                          * info in the first pass to parse it correctly.
 236                          *
 237                          * Save the length and address of the body
 238                          */
 239                         op->named.data = walk_state->parser_state.aml;
 240                         op->named.length = (u32)
 241                             (walk_state->parser_state.pkg_end -
 242                              walk_state->parser_state.aml);
 243
 244                         /* Skip body of method */
 245
 246                         walk_state->parser_state.aml =
 247                             walk_state->parser_state.pkg_end;
 248                         walk_state->arg_count = 0;
 249                         break;
 250
 251                 case AML_BUFFER_OP:
 252                 case AML_PACKAGE_OP:
 253                 case AML_VARIABLE_PACKAGE_OP:
 254
 255                         if ((op->common.parent) &&
 256                             (op->common.parent->common.aml_opcode ==
 257                              AML_NAME_OP)
 258                             && (walk_state->pass_number <=
 259                                 ACPI_IMODE_LOAD_PASS2)) {
 260                                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 261                                                   "Setup Package/Buffer: Pass %u, AML Ptr: %p\n",
 262                                                   walk_state->pass_number,
 263                                                   aml_op_start));
 264
 265                                 /*
 266                                  * Skip parsing of Buffers and Packages because we don't have
 267                                  * enough info in the first pass to parse them correctly.
 268                                  */
 269                                 op->named.data = aml_op_start;
 270                                 op->named.length = (u32)
 271                                     (walk_state->parser_state.pkg_end -
 272                                      aml_op_start);
 273
 274                                 /* Skip body */
 275
 276                                 walk_state->parser_state.aml =
 277                                     walk_state->parser_state.pkg_end;
 278                                 walk_state->arg_count = 0;
 279                         }
 280                         break;
 281
 282                 case AML_WHILE_OP:
 283
 284                         if (walk_state->control_state) {
 285                                 walk_state->control_state->control.package_end =
 286                                     walk_state->parser_state.pkg_end;
 287                         }
 288                         break;
 289
 290                 default:
 291
 292                         /* No action for all other opcodes */
 293
 294                         break;
 295                 }
 296
 297                 break;
 298         }
 299
 300         return_ACPI_STATUS(AE_OK);
 301 }
 302
 303 /*******************************************************************************
 304  *
 305  * FUNCTION:    acpi_ps_link_module_code
 306  *
 307  * PARAMETERS:  parent_op           - Parent parser op
 308  *              aml_start           - Pointer to the AML
 309  *              aml_length          - Length of executable AML
 310  *              owner_id            - owner_id of module level code
 311  *
 312  * RETURN:      None.
 313  *
 314  * DESCRIPTION: Wrap the module-level code with a method object and link the
 315  *              object to the global list. Note, the mutex field of the method
 316  *              object is used to link multiple module-level code objects.
 317  *
 318  * NOTE: In this legacy option, each block of detected executable AML
 319  * code that is outside of any control method is wrapped with a temporary
 320  * control method object and placed on a global list below.
 321  *
 322  * This function executes the module-level code for all tables only after
 323  * all of the tables have been loaded. It is a legacy option and is
 324  * not compatible with other ACPI implementations. See acpi_ns_load_table.
 325  *
 326  * This function will be removed when the legacy option is removed.
 327  *
 328  ******************************************************************************/
 329
 330 static void
 331 acpi_ps_link_module_code(union acpi_parse_object *parent_op,
 332                          u8 *aml_start, u32 aml_length, acpi_owner_id owner_id)
 333 {
 334         union acpi_operand_object *prev;
 335         union acpi_operand_object *next;
 336         union acpi_operand_object *method_obj;
 337         struct acpi_namespace_node *parent_node;
 338
 339         ACPI_FUNCTION_TRACE(ps_link_module_code);
 340
 341         /* Get the tail of the list */
 342
 343         prev = next = acpi_gbl_module_code_list;
 344         while (next) {
 345                 prev = next;
 346                 next = next->method.mutex;
 347         }
 348
 349         /*
 350          * Insert the module level code into the list. Merge it if it is
 351          * adjacent to the previous element.
 352          */
 353         if (!prev ||
 354             ((prev->method.aml_start + prev->method.aml_length) != aml_start)) {
 355
 356                 /* Create, initialize, and link a new temporary method object */
 357
 358                 method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 359                 if (!method_obj) {
 360                         return_VOID;
 361                 }
 362
 363                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 364                                   "Create/Link new code block: %p\n",
 365                                   method_obj));
 366
 367                 if (parent_op->common.node) {
 368                         parent_node = parent_op->common.node;
 369                 } else {
 370                         parent_node = acpi_gbl_root_node;
 371                 }
 372
 373                 method_obj->method.aml_start = aml_start;
 374                 method_obj->method.aml_length = aml_length;
 375                 method_obj->method.owner_id = owner_id;
 376                 method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL;
 377
 378                 /*
 379                  * Save the parent node in next_object. This is cheating, but we
 380                  * don't want to expand the method object.
 381                  */
 382                 method_obj->method.next_object =
 383                     ACPI_CAST_PTR(union acpi_operand_object, parent_node);
 384
 385                 if (!prev) {
 386                         acpi_gbl_module_code_list = method_obj;
 387                 } else {
 388                         prev->method.mutex = method_obj;
 389                 }
 390         } else {
 391                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 392                                   "Appending to existing code block: %p\n",
 393                                   prev));
 394
 395                 prev->method.aml_length += aml_length;
 396         }
 397
 398         return_VOID;
 399 }
 400
 401 /*******************************************************************************
 402  *
 403  * FUNCTION:    acpi_ps_parse_loop
 404  *
 405  * PARAMETERS:  walk_state          - Current state
 406  *
 407  * RETURN:      Status
 408  *
 409  * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
 410  *              a tree of ops.
 411  *
 412  ******************************************************************************/
 413
 414 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
 415 {
 416         acpi_status status = AE_OK;
 417         union acpi_parse_object *op = NULL;     /* current op */
 418         struct acpi_parse_state *parser_state;
 419         u8 *aml_op_start = NULL;
 420         u8 opcode_length;
 421
 422         ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
 423
 424         if (walk_state->descending_callback == NULL) {
 425                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 426         }
 427
 428         parser_state = &walk_state->parser_state;
 429         walk_state->arg_types = 0;
 430
 431 #ifndef ACPI_CONSTANT_EVAL_ONLY
 432
 433         if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
 434
 435                 /* We are restarting a preempted control method */
 436
 437                 if (acpi_ps_has_completed_scope(parser_state)) {
 438                         /*
 439                          * We must check if a predicate to an IF or WHILE statement
 440                          * was just completed
 441                          */
 442                         if ((parser_state->scope->parse_scope.op) &&
 443                             ((parser_state->scope->parse_scope.op->common.
 444                               aml_opcode == AML_IF_OP)
 445                              || (parser_state->scope->parse_scope.op->common.
 446                                  aml_opcode == AML_WHILE_OP))
 447                             && (walk_state->control_state)
 448                             && (walk_state->control_state->common.state ==
 449                                 ACPI_CONTROL_PREDICATE_EXECUTING)) {
 450                                 /*
 451                                  * A predicate was just completed, get the value of the
 452                                  * predicate and branch based on that value
 453                                  */
 454                                 walk_state->op = NULL;
 455                                 status =
 456                                     acpi_ds_get_predicate_value(walk_state,
 457                                                                 ACPI_TO_POINTER
 458                                                                 (TRUE));
 459                                 if (ACPI_FAILURE(status)
 460                                     && ((status & AE_CODE_MASK) !=
 461                                         AE_CODE_CONTROL)) {
 462                                         if (status == AE_AML_NO_RETURN_VALUE) {
 463                                                 ACPI_EXCEPTION((AE_INFO, status,
 464                                                                 "Invoked method did not return a value"));
 465                                         }
 466
 467                                         ACPI_EXCEPTION((AE_INFO, status,
 468                                                         "GetPredicate Failed"));
 469                                         return_ACPI_STATUS(status);
 470                                 }
 471
 472                                 status =
 473                                     acpi_ps_next_parse_state(walk_state, op,
 474                                                              status);
 475                         }
 476
 477                         acpi_ps_pop_scope(parser_state, &op,
 478                                           &walk_state->arg_types,
 479                                           &walk_state->arg_count);
 480                         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 481                                           "Popped scope, Op=%p\n", op));
 482                 } else if (walk_state->prev_op) {
 483
 484                         /* We were in the middle of an op */
 485
 486                         op = walk_state->prev_op;
 487                         walk_state->arg_types = walk_state->prev_arg_types;
 488                 }
 489         }
 490 #endif
 491
 492         /* Iterative parsing loop, while there is more AML to process: */
 493
 494         while ((parser_state->aml < parser_state->aml_end) || (op)) {
 495                 ASL_CV_CAPTURE_COMMENTS(walk_state);
 496
 497                 aml_op_start = parser_state->aml;
 498                 if (!op) {
 499                         status =
 500                             acpi_ps_create_op(walk_state, aml_op_start, &op);
 501                         if (ACPI_FAILURE(status)) {
 502                                 /*
 503                                  * ACPI_PARSE_MODULE_LEVEL means that we are loading a table by
 504                                  * executing it as a control method. However, if we encounter
 505                                  * an error while loading the table, we need to keep trying to
 506                                  * load the table rather than aborting the table load. Set the
 507                                  * status to AE_OK to proceed with the table load.
 508                                  */
 509                                 if ((walk_state->
 510                                      parse_flags & ACPI_PARSE_MODULE_LEVEL)
 511                                     && ((status == AE_ALREADY_EXISTS)
 512                                         || (status == AE_NOT_FOUND))) {
 513                                         status = AE_OK;
 514                                 }
 515                                 if (status == AE_CTRL_PARSE_CONTINUE) {
 516                                         continue;
 517                                 }
 518
 519                                 if (status == AE_CTRL_PARSE_PENDING) {
 520                                         status = AE_OK;
 521                                 }
 522
 523                                 if (status == AE_CTRL_TERMINATE) {
 524                                         return_ACPI_STATUS(status);
 525                                 }
 526
 527                                 status =
 528                                     acpi_ps_complete_op(walk_state, &op,
 529                                                         status);
 530                                 if (ACPI_FAILURE(status)) {
 531                                         return_ACPI_STATUS(status);
 532                                 }
 533                                 if (acpi_ns_opens_scope
 534                                     (acpi_ps_get_opcode_info
 535                                      (walk_state->opcode)->object_type)) {
 536                                         /*
 537                                          * If the scope/device op fails to parse, skip the body of
 538                                          * the scope op because the parse failure indicates that
 539                                          * the device may not exist.
 540                                          */
 541                                         ACPI_INFO(("Skipping parse of AML opcode: %s (0x%4.4X)", acpi_ps_get_opcode_name(walk_state->opcode), walk_state->opcode));
 542
 543                                         /*
 544                                          * Determine the opcode length before skipping the opcode.
 545                                          * An opcode can be 1 byte or 2 bytes in length.
 546                                          */
 547                                         opcode_length = 1;
 548                                         if ((walk_state->opcode & 0xFF00) ==
 549                                             AML_EXTENDED_OPCODE) {
 550                                                 opcode_length = 2;
 551                                         }
 552                                         walk_state->parser_state.aml =
 553                                             walk_state->aml + opcode_length;
 554
 555                                         walk_state->parser_state.aml =
 556                                             acpi_ps_get_next_package_end
 557                                             (&walk_state->parser_state);
 558                                         walk_state->aml =
 559                                             walk_state->parser_state.aml;
 560                                 }
 561
 562                                 continue;
 563                         }
 564
 565                         acpi_ex_start_trace_opcode(op, walk_state);
 566                 }
 567
 568                 /*
 569                  * Start arg_count at zero because we don't know if there are
 570                  * any args yet
 571                  */
 572                 walk_state->arg_count = 0;
 573
 574                 switch (op->common.aml_opcode) {
 575                 case AML_BYTE_OP:
 576                 case AML_WORD_OP:
 577                 case AML_DWORD_OP:
 578                 case AML_QWORD_OP:
 579
 580                         break;
 581
 582                 default:
 583
 584                         ASL_CV_CAPTURE_COMMENTS(walk_state);
 585                         break;
 586                 }
 587
 588                 /* Are there any arguments that must be processed? */
 589
 590                 if (walk_state->arg_types) {
 591
 592                         /* Get arguments */
 593
 594                         status =
 595                             acpi_ps_get_arguments(walk_state, aml_op_start, op);
 596                         if (ACPI_FAILURE(status)) {
 597                                 status =
 598                                     acpi_ps_complete_op(walk_state, &op,
 599                                                         status);
 600                                 if (ACPI_FAILURE(status)) {
 601                                         return_ACPI_STATUS(status);
 602                                 }
 603                                 if ((walk_state->control_state) &&
 604                                     ((walk_state->control_state->control.
 605                                       opcode == AML_IF_OP)
 606                                      || (walk_state->control_state->control.
 607                                          opcode == AML_WHILE_OP))) {
 608                                         /*
 609                                          * If the if/while op fails to parse, we will skip parsing
 610                                          * the body of the op.
 611                                          */
 612                                         parser_state->aml =
 613                                             walk_state->control_state->control.
 614                                             aml_predicate_start + 1;
 615                                         parser_state->aml =
 616                                             acpi_ps_get_next_package_end
 617                                             (parser_state);
 618                                         walk_state->aml = parser_state->aml;
 619
 620                                         ACPI_ERROR((AE_INFO,
 621                                                     "Skipping While/If block"));
 622                                         if (*walk_state->aml == AML_ELSE_OP) {
 623                                                 ACPI_ERROR((AE_INFO,
 624                                                             "Skipping Else block"));
 625                                                 walk_state->parser_state.aml =
 626                                                     walk_state->aml + 1;
 627                                                 walk_state->parser_state.aml =
 628                                                     acpi_ps_get_next_package_end
 629                                                     (parser_state);
 630                                                 walk_state->aml =
 631                                                     parser_state->aml;
 632                                         }
 633                                         ACPI_FREE(acpi_ut_pop_generic_state
 634                                                   (&walk_state->control_state));
 635                                 }
 636                                 op = NULL;
 637                                 continue;
 638                         }
 639                 }
 640
 641                 /* Check for arguments that need to be processed */
 642
 643                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 644                                   "Parseloop: argument count: %8.8X\n",
 645                                   walk_state->arg_count));
 646
 647                 if (walk_state->arg_count) {
 648                         /*
 649                          * There are arguments (complex ones), push Op and
 650                          * prepare for argument
 651                          */
 652                         status = acpi_ps_push_scope(parser_state, op,
 653                                                     walk_state->arg_types,
 654                                                     walk_state->arg_count);
 655                         if (ACPI_FAILURE(status)) {
 656                                 status =
 657                                     acpi_ps_complete_op(walk_state, &op,
 658                                                         status);
 659                                 if (ACPI_FAILURE(status)) {
 660                                         return_ACPI_STATUS(status);
 661                                 }
 662
 663                                 continue;
 664                         }
 665
 666                         op = NULL;
 667                         continue;
 668                 }
 669
 670                 /*
 671                  * All arguments have been processed -- Op is complete,
 672                  * prepare for next
 673                  */
 674                 walk_state->op_info =
 675                     acpi_ps_get_opcode_info(op->common.aml_opcode);
 676                 if (walk_state->op_info->flags & AML_NAMED) {
 677                         if (op->common.aml_opcode == AML_REGION_OP ||
 678                             op->common.aml_opcode == AML_DATA_REGION_OP) {
 679                                 /*
 680                                  * Skip parsing of control method or opregion body,
 681                                  * because we don't have enough info in the first pass
 682                                  * to parse them correctly.
 683                                  *
 684                                  * Completed parsing an op_region declaration, we now
 685                                  * know the length.
 686                                  */
 687                                 op->named.length =
 688                                     (u32) (parser_state->aml - op->named.data);
 689                         }
 690                 }
 691
 692                 if (walk_state->op_info->flags & AML_CREATE) {
 693                         /*
 694                          * Backup to beginning of create_XXXfield declaration (1 for
 695                          * Opcode)
 696                          *
 697                          * body_length is unknown until we parse the body
 698                          */
 699                         op->named.length =
 700                             (u32) (parser_state->aml - op->named.data);
 701                 }
 702
 703                 if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
 704                         /*
 705                          * Backup to beginning of bank_field declaration
 706                          *
 707                          * body_length is unknown until we parse the body
 708                          */
 709                         op->named.length =
 710                             (u32) (parser_state->aml - op->named.data);
 711                 }
 712
 713                 /* This op complete, notify the dispatcher */
 714
 715                 if (walk_state->ascending_callback != NULL) {
 716                         walk_state->op = op;
 717                         walk_state->opcode = op->common.aml_opcode;
 718
 719                         status = walk_state->ascending_callback(walk_state);
 720                         status =
 721                             acpi_ps_next_parse_state(walk_state, op, status);
 722                         if (status == AE_CTRL_PENDING) {
 723                                 status = AE_OK;
 724                         } else
 725                             if ((walk_state->
 726                                  parse_flags & ACPI_PARSE_MODULE_LEVEL)
 727                                 && (ACPI_AML_EXCEPTION(status)
 728                                     || status == AE_ALREADY_EXISTS
 729                                     || status == AE_NOT_FOUND)) {
 730                                 /*
 731                                  * ACPI_PARSE_MODULE_LEVEL flag means that we
 732                                  * are currently loading a table by executing
 733                                  * it as a control method. However, if we
 734                                  * encounter an error while loading the table,
 735                                  * we need to keep trying to load the table
 736                                  * rather than aborting the table load (setting
 737                                  * the status to AE_OK continues the table
 738                                  * load). If we get a failure at this point, it
 739                                  * means that the dispatcher got an error while
 740                                  * trying to execute the Op.
 741                                  */
 742                                 status = AE_OK;
 743                         }
 744                 }
 745
 746                 status = acpi_ps_complete_op(walk_state, &op, status);
 747                 if (ACPI_FAILURE(status)) {
 748                         return_ACPI_STATUS(status);
 749                 }
 750
 751         }                       /* while parser_state->Aml */
 752
 753         status = acpi_ps_complete_final_op(walk_state, op, status);
 754         return_ACPI_STATUS(status);
 755 }