SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/acpi/parser/psloop.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psloop - Main AML parse loop
   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 /*
  45  * Parse the AML and build an operation tree as most interpreters,
  46  * like Perl, do.  Parsing is done by hand rather than with a YACC
  47  * generated parser to tightly constrain stack and dynamic memory
  48  * usage.  At the same time, parsing is kept flexible and the code
  49  * fairly compact by parsing based on a list of AML opcode
  50  * templates in aml_op_info[]
  51  */
  52
  53 #include <acpi/acpi.h>
  54 #include <acpi/acparser.h>
  55 #include <acpi/acdispat.h>
  56 #include <acpi/amlcode.h>
  57
  58 #define _COMPONENT          ACPI_PARSER
  59 ACPI_MODULE_NAME("psloop")
  60
  61 static u32 acpi_gbl_depth = 0;
  62
  63 /*******************************************************************************
  64  *
  65  * FUNCTION:    acpi_ps_parse_loop
  66  *
  67  * PARAMETERS:  walk_state          - Current state
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
  72  *              a tree of ops.
  73  *
  74  ******************************************************************************/
  75
  76 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
  77 {
  78         acpi_status status = AE_OK;
  79         acpi_status status2;
  80         union acpi_parse_object *op = NULL;     /* current op */
  81         union acpi_parse_object *arg = NULL;
  82         union acpi_parse_object *pre_op = NULL;
  83         struct acpi_parse_state *parser_state;
  84         u8 *aml_op_start = NULL;
  85
  86         ACPI_FUNCTION_TRACE_PTR("ps_parse_loop", walk_state);
  87
  88         if (walk_state->descending_callback == NULL) {
  89                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  90         }
  91
  92         parser_state = &walk_state->parser_state;
  93         walk_state->arg_types = 0;
  94
  95 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
  96
  97         if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
  98                 /* We are restarting a preempted control method */
  99
 100                 if (acpi_ps_has_completed_scope(parser_state)) {
 101                         /*
 102                          * We must check if a predicate to an IF or WHILE statement
 103                          * was just completed
 104                          */
 105                         if ((parser_state->scope->parse_scope.op) &&
 106                             ((parser_state->scope->parse_scope.op->common.
 107                               aml_opcode == AML_IF_OP)
 108                              || (parser_state->scope->parse_scope.op->common.
 109                                  aml_opcode == AML_WHILE_OP))
 110                             && (walk_state->control_state)
 111                             && (walk_state->control_state->common.state ==
 112                                 ACPI_CONTROL_PREDICATE_EXECUTING)) {
 113                                 /*
 114                                  * A predicate was just completed, get the value of the
 115                                  * predicate and branch based on that value
 116                                  */
 117                                 walk_state->op = NULL;
 118                                 status =
 119                                     acpi_ds_get_predicate_value(walk_state,
 120                                                                 ACPI_TO_POINTER
 121                                                                 (TRUE));
 122                                 if (ACPI_FAILURE(status)
 123                                     && ((status & AE_CODE_MASK) !=
 124                                         AE_CODE_CONTROL)) {
 125                                         if (status == AE_AML_NO_RETURN_VALUE) {
 126                                                 ACPI_REPORT_ERROR(("Invoked method did not return a value, %s\n", acpi_format_exception(status)));
 127
 128                                         }
 129                                         ACPI_REPORT_ERROR(("get_predicate Failed, %s\n", acpi_format_exception(status)));
 130                                         return_ACPI_STATUS(status);
 131                                 }
 132
 133                                 status =
 134                                     acpi_ps_next_parse_state(walk_state, op,
 135                                                              status);
 136                         }
 137
 138                         acpi_ps_pop_scope(parser_state, &op,
 139                                           &walk_state->arg_types,
 140                                           &walk_state->arg_count);
 141                         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 142                                           "Popped scope, Op=%p\n", op));
 143                 } else if (walk_state->prev_op) {
 144                         /* We were in the middle of an op */
 145
 146                         op = walk_state->prev_op;
 147                         walk_state->arg_types = walk_state->prev_arg_types;
 148                 }
 149         }
 150 #endif
 151
 152         /* Iterative parsing loop, while there is more AML to process: */
 153
 154         while ((parser_state->aml < parser_state->aml_end) || (op)) {
 155                 aml_op_start = parser_state->aml;
 156                 if (!op) {
 157                         /* Get the next opcode from the AML stream */
 158
 159                         walk_state->aml_offset =
 160                             (u32) ACPI_PTR_DIFF(parser_state->aml,
 161                                                 parser_state->aml_start);
 162                         walk_state->opcode = acpi_ps_peek_opcode(parser_state);
 163
 164                         /*
 165                          * First cut to determine what we have found:
 166                          * 1) A valid AML opcode
 167                          * 2) A name string
 168                          * 3) An unknown/invalid opcode
 169                          */
 170                         walk_state->op_info =
 171                             acpi_ps_get_opcode_info(walk_state->opcode);
 172                         switch (walk_state->op_info->class) {
 173                         case AML_CLASS_ASCII:
 174                         case AML_CLASS_PREFIX:
 175                                 /*
 176                                  * Starts with a valid prefix or ASCII char, this is a name
 177                                  * string.  Convert the bare name string to a namepath.
 178                                  */
 179                                 walk_state->opcode = AML_INT_NAMEPATH_OP;
 180                                 walk_state->arg_types = ARGP_NAMESTRING;
 181                                 break;
 182
 183                         case AML_CLASS_UNKNOWN:
 184
 185                                 /* The opcode is unrecognized.  Just skip unknown opcodes */
 186
 187                                 ACPI_REPORT_ERROR(("Found unknown opcode %X at AML address %p offset %X, ignoring\n", walk_state->opcode, parser_state->aml, walk_state->aml_offset));
 188
 189                                 ACPI_DUMP_BUFFER(parser_state->aml, 128);
 190
 191                                 /* Assume one-byte bad opcode */
 192
 193                                 parser_state->aml++;
 194                                 continue;
 195
 196                         default:
 197
 198                                 /* Found opcode info, this is a normal opcode */
 199
 200                                 parser_state->aml +=
 201                                     acpi_ps_get_opcode_size(walk_state->opcode);
 202                                 walk_state->arg_types =
 203                                     walk_state->op_info->parse_args;
 204                                 break;
 205                         }
 206
 207                         /* Create Op structure and append to parent's argument list */
 208
 209                         if (walk_state->op_info->flags & AML_NAMED) {
 210                                 /* Allocate a new pre_op if necessary */
 211
 212                                 if (!pre_op) {
 213                                         pre_op =
 214                                             acpi_ps_alloc_op(walk_state->
 215                                                              opcode);
 216                                         if (!pre_op) {
 217                                                 status = AE_NO_MEMORY;
 218                                                 goto close_this_op;
 219                                         }
 220                                 }
 221
 222                                 pre_op->common.value.arg = NULL;
 223                                 pre_op->common.aml_opcode = walk_state->opcode;
 224
 225                                 /*
 226                                  * Get and append arguments until we find the node that contains
 227                                  * the name (the type ARGP_NAME).
 228                                  */
 229                                 while (GET_CURRENT_ARG_TYPE
 230                                        (walk_state->arg_types)
 231                                        &&
 232                                        (GET_CURRENT_ARG_TYPE
 233                                         (walk_state->arg_types) != ARGP_NAME)) {
 234                                         status =
 235                                             acpi_ps_get_next_arg(walk_state,
 236                                                                  parser_state,
 237                                                                  GET_CURRENT_ARG_TYPE
 238                                                                  (walk_state->
 239                                                                   arg_types),
 240                                                                  &arg);
 241                                         if (ACPI_FAILURE(status)) {
 242                                                 goto close_this_op;
 243                                         }
 244
 245                                         acpi_ps_append_arg(pre_op, arg);
 246                                         INCREMENT_ARG_LIST(walk_state->
 247                                                            arg_types);
 248                                 }
 249
 250                                 /*
 251                                  * Make sure that we found a NAME and didn't run out of
 252                                  * arguments
 253                                  */
 254                                 if (!GET_CURRENT_ARG_TYPE
 255                                     (walk_state->arg_types)) {
 256                                         status = AE_AML_NO_OPERAND;
 257                                         goto close_this_op;
 258                                 }
 259
 260                                 /* We know that this arg is a name, move to next arg */
 261
 262                                 INCREMENT_ARG_LIST(walk_state->arg_types);
 263
 264                                 /*
 265                                  * Find the object.  This will either insert the object into
 266                                  * the namespace or simply look it up
 267                                  */
 268                                 walk_state->op = NULL;
 269
 270                                 status =
 271                                     walk_state->descending_callback(walk_state,
 272                                                                     &op);
 273                                 if (ACPI_FAILURE(status)) {
 274                                         ACPI_REPORT_ERROR(("During name lookup/catalog, %s\n", acpi_format_exception(status)));
 275                                         goto close_this_op;
 276                                 }
 277
 278                                 if (!op) {
 279                                         continue;
 280                                 }
 281
 282                                 status =
 283                                     acpi_ps_next_parse_state(walk_state, op,
 284                                                              status);
 285                                 if (status == AE_CTRL_PENDING) {
 286                                         status = AE_OK;
 287                                         goto close_this_op;
 288                                 }
 289
 290                                 if (ACPI_FAILURE(status)) {
 291                                         goto close_this_op;
 292                                 }
 293
 294                                 acpi_ps_append_arg(op,
 295                                                    pre_op->common.value.arg);
 296                                 acpi_gbl_depth++;
 297
 298                                 if (op->common.aml_opcode == AML_REGION_OP) {
 299                                         /*
 300                                          * Defer final parsing of an operation_region body,
 301                                          * because we don't have enough info in the first pass
 302                                          * to parse it correctly (i.e., there may be method
 303                                          * calls within the term_arg elements of the body.)
 304                                          *
 305                                          * However, we must continue parsing because
 306                                          * the opregion is not a standalone package --
 307                                          * we don't know where the end is at this point.
 308                                          *
 309                                          * (Length is unknown until parse of the body complete)
 310                                          */
 311                                         op->named.data = aml_op_start;
 312                                         op->named.length = 0;
 313                                 }
 314                         } else {
 315                                 /* Not a named opcode, just allocate Op and append to parent */
 316
 317                                 walk_state->op_info =
 318                                     acpi_ps_get_opcode_info(walk_state->opcode);
 319                                 op = acpi_ps_alloc_op(walk_state->opcode);
 320                                 if (!op) {
 321                                         status = AE_NO_MEMORY;
 322                                         goto close_this_op;
 323                                 }
 324
 325                                 if (walk_state->op_info->flags & AML_CREATE) {
 326                                         /*
 327                                          * Backup to beginning of create_xXXfield declaration
 328                                          * body_length is unknown until we parse the body
 329                                          */
 330                                         op->named.data = aml_op_start;
 331                                         op->named.length = 0;
 332                                 }
 333
 334                                 acpi_ps_append_arg(acpi_ps_get_parent_scope
 335                                                    (parser_state), op);
 336
 337                                 if ((walk_state->descending_callback != NULL)) {
 338                                         /*
 339                                          * Find the object. This will either insert the object into
 340                                          * the namespace or simply look it up
 341                                          */
 342                                         walk_state->op = op;
 343
 344                                         status =
 345                                             walk_state->
 346                                             descending_callback(walk_state,
 347                                                                 &op);
 348                                         status =
 349                                             acpi_ps_next_parse_state(walk_state,
 350                                                                      op,
 351                                                                      status);
 352                                         if (status == AE_CTRL_PENDING) {
 353                                                 status = AE_OK;
 354                                                 goto close_this_op;
 355                                         }
 356
 357                                         if (ACPI_FAILURE(status)) {
 358                                                 goto close_this_op;
 359                                         }
 360                                 }
 361                         }
 362
 363                         op->common.aml_offset = walk_state->aml_offset;
 364
 365                         if (walk_state->op_info) {
 366                                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 367                                                   "Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n",
 368                                                   (u32) op->common.aml_opcode,
 369                                                   walk_state->op_info->name, op,
 370                                                   parser_state->aml,
 371                                                   op->common.aml_offset));
 372                         }
 373                 }
 374
 375                 /*
 376                  * Start arg_count at zero because we don't know if there are
 377                  * any args yet
 378                  */
 379                 walk_state->arg_count = 0;
 380
 381                 /* Are there any arguments that must be processed? */
 382
 383                 if (walk_state->arg_types) {
 384                         /* Get arguments */
 385
 386                         switch (op->common.aml_opcode) {
 387                         case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
 388                         case AML_WORD_OP:       /* AML_WORDDATA_ARG */
 389                         case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
 390                         case AML_QWORD_OP:      /* AML_QWORDATA_ARG */
 391                         case AML_STRING_OP:     /* AML_ASCIICHARLIST_ARG */
 392
 393                                 /* Fill in constant or string argument directly */
 394
 395                                 acpi_ps_get_next_simple_arg(parser_state,
 396                                                             GET_CURRENT_ARG_TYPE
 397                                                             (walk_state->
 398                                                              arg_types), op);
 399                                 break;
 400
 401                         case AML_INT_NAMEPATH_OP:       /* AML_NAMESTRING_ARG */
 402
 403                                 status =
 404                                     acpi_ps_get_next_namepath(walk_state,
 405                                                               parser_state, op,
 406                                                               1);
 407                                 if (ACPI_FAILURE(status)) {
 408                                         goto close_this_op;
 409                                 }
 410
 411                                 walk_state->arg_types = 0;
 412                                 break;
 413
 414                         default:
 415                                 /*
 416                                  * Op is not a constant or string, append each argument
 417                                  * to the Op
 418                                  */
 419                                 while (GET_CURRENT_ARG_TYPE
 420                                        (walk_state->arg_types)
 421                                        && !walk_state->arg_count) {
 422                                         walk_state->aml_offset = (u32)
 423                                             ACPI_PTR_DIFF(parser_state->aml,
 424                                                           parser_state->
 425                                                           aml_start);
 426
 427                                         status =
 428                                             acpi_ps_get_next_arg(walk_state,
 429                                                                  parser_state,
 430                                                                  GET_CURRENT_ARG_TYPE
 431                                                                  (walk_state->
 432                                                                   arg_types),
 433                                                                  &arg);
 434                                         if (ACPI_FAILURE(status)) {
 435                                                 goto close_this_op;
 436                                         }
 437
 438                                         if (arg) {
 439                                                 arg->common.aml_offset =
 440                                                     walk_state->aml_offset;
 441                                                 acpi_ps_append_arg(op, arg);
 442                                         }
 443                                         INCREMENT_ARG_LIST(walk_state->
 444                                                            arg_types);
 445                                 }
 446
 447                                 /* Special processing for certain opcodes */
 448
 449                                 /* TBD (remove): Temporary mechanism to disable this code if needed */
 450
 451 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 452
 453                                 if ((walk_state->pass_number <=
 454                                      ACPI_IMODE_LOAD_PASS1)
 455                                     &&
 456                                     ((walk_state->
 457                                       parse_flags & ACPI_PARSE_DISASSEMBLE) ==
 458                                      0)) {
 459                                         /*
 460                                          * We want to skip If/Else/While constructs during Pass1
 461                                          * because we want to actually conditionally execute the
 462                                          * code during Pass2.
 463                                          *
 464                                          * Except for disassembly, where we always want to
 465                                          * walk the If/Else/While packages
 466                                          */
 467                                         switch (op->common.aml_opcode) {
 468                                         case AML_IF_OP:
 469                                         case AML_ELSE_OP:
 470                                         case AML_WHILE_OP:
 471
 472                                                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 473                                                                   "Pass1: Skipping an If/Else/While body\n"));
 474
 475                                                 /* Skip body of if/else/while in pass 1 */
 476
 477                                                 parser_state->aml =
 478                                                     parser_state->pkg_end;
 479                                                 walk_state->arg_count = 0;
 480                                                 break;
 481
 482                                         default:
 483                                                 break;
 484                                         }
 485                                 }
 486 #endif
 487                                 switch (op->common.aml_opcode) {
 488                                 case AML_METHOD_OP:
 489
 490                                         /*
 491                                          * Skip parsing of control method
 492                                          * because we don't have enough info in the first pass
 493                                          * to parse it correctly.
 494                                          *
 495                                          * Save the length and address of the body
 496                                          */
 497                                         op->named.data = parser_state->aml;
 498                                         op->named.length =
 499                                             (u32) (parser_state->pkg_end -
 500                                                    parser_state->aml);
 501
 502                                         /* Skip body of method */
 503
 504                                         parser_state->aml =
 505                                             parser_state->pkg_end;
 506                                         walk_state->arg_count = 0;
 507                                         break;
 508
 509                                 case AML_BUFFER_OP:
 510                                 case AML_PACKAGE_OP:
 511                                 case AML_VAR_PACKAGE_OP:
 512
 513                                         if ((op->common.parent) &&
 514                                             (op->common.parent->common.
 515                                              aml_opcode == AML_NAME_OP)
 516                                             && (walk_state->pass_number <=
 517                                                 ACPI_IMODE_LOAD_PASS2)) {
 518                                                 /*
 519                                                  * Skip parsing of Buffers and Packages
 520                                                  * because we don't have enough info in the first pass
 521                                                  * to parse them correctly.
 522                                                  */
 523                                                 op->named.data = aml_op_start;
 524                                                 op->named.length =
 525                                                     (u32) (parser_state->
 526                                                            pkg_end -
 527                                                            aml_op_start);
 528
 529                                                 /* Skip body */
 530
 531                                                 parser_state->aml =
 532                                                     parser_state->pkg_end;
 533                                                 walk_state->arg_count = 0;
 534                                         }
 535                                         break;
 536
 537                                 case AML_WHILE_OP:
 538
 539                                         if (walk_state->control_state) {
 540                                                 walk_state->control_state->
 541                                                     control.package_end =
 542                                                     parser_state->pkg_end;
 543                                         }
 544                                         break;
 545
 546                                 default:
 547
 548                                         /* No action for all other opcodes */
 549                                         break;
 550                                 }
 551                                 break;
 552                         }
 553                 }
 554
 555                 /* Check for arguments that need to be processed */
 556
 557                 if (walk_state->arg_count) {
 558                         /*
 559                          * There are arguments (complex ones), push Op and
 560                          * prepare for argument
 561                          */
 562                         status = acpi_ps_push_scope(parser_state, op,
 563                                                     walk_state->arg_types,
 564                                                     walk_state->arg_count);
 565                         if (ACPI_FAILURE(status)) {
 566                                 goto close_this_op;
 567                         }
 568                         op = NULL;
 569                         continue;
 570                 }
 571
 572                 /*
 573                  * All arguments have been processed -- Op is complete,
 574                  * prepare for next
 575                  */
 576                 walk_state->op_info =
 577                     acpi_ps_get_opcode_info(op->common.aml_opcode);
 578                 if (walk_state->op_info->flags & AML_NAMED) {
 579                         if (acpi_gbl_depth) {
 580                                 acpi_gbl_depth--;
 581                         }
 582
 583                         if (op->common.aml_opcode == AML_REGION_OP) {
 584                                 /*
 585                                  * Skip parsing of control method or opregion body,
 586                                  * because we don't have enough info in the first pass
 587                                  * to parse them correctly.
 588                                  *
 589                                  * Completed parsing an op_region declaration, we now
 590                                  * know the length.
 591                                  */
 592                                 op->named.length =
 593                                     (u32) (parser_state->aml - op->named.data);
 594                         }
 595                 }
 596
 597                 if (walk_state->op_info->flags & AML_CREATE) {
 598                         /*
 599                          * Backup to beginning of create_xXXfield declaration (1 for
 600                          * Opcode)
 601                          *
 602                          * body_length is unknown until we parse the body
 603                          */
 604                         op->named.length =
 605                             (u32) (parser_state->aml - op->named.data);
 606                 }
 607
 608                 /* This op complete, notify the dispatcher */
 609
 610                 if (walk_state->ascending_callback != NULL) {
 611                         walk_state->op = op;
 612                         walk_state->opcode = op->common.aml_opcode;
 613
 614                         status = walk_state->ascending_callback(walk_state);
 615                         status =
 616                             acpi_ps_next_parse_state(walk_state, op, status);
 617                         if (status == AE_CTRL_PENDING) {
 618                                 status = AE_OK;
 619                                 goto close_this_op;
 620                         }
 621                 }
 622
 623               close_this_op:
 624                 /*
 625                  * Finished one argument of the containing scope
 626                  */
 627                 parser_state->scope->parse_scope.arg_count--;
 628
 629                 /* Finished with pre_op */
 630
 631                 if (pre_op) {
 632                         acpi_ps_free_op(pre_op);
 633                         pre_op = NULL;
 634                 }
 635
 636                 /* Close this Op (will result in parse subtree deletion) */
 637
 638                 status2 = acpi_ps_complete_this_op(walk_state, op);
 639                 if (ACPI_FAILURE(status2)) {
 640                         return_ACPI_STATUS(status2);
 641                 }
 642                 op = NULL;
 643
 644                 switch (status) {
 645                 case AE_OK:
 646                         break;
 647
 648                 case AE_CTRL_TRANSFER:
 649
 650                         /* We are about to transfer to a called method. */
 651
 652                         walk_state->prev_op = op;
 653                         walk_state->prev_arg_types = walk_state->arg_types;
 654                         return_ACPI_STATUS(status);
 655
 656                 case AE_CTRL_END:
 657
 658                         acpi_ps_pop_scope(parser_state, &op,
 659                                           &walk_state->arg_types,
 660                                           &walk_state->arg_count);
 661
 662                         if (op) {
 663                                 walk_state->op = op;
 664                                 walk_state->op_info =
 665                                     acpi_ps_get_opcode_info(op->common.
 666                                                             aml_opcode);
 667                                 walk_state->opcode = op->common.aml_opcode;
 668
 669                                 status =
 670                                     walk_state->ascending_callback(walk_state);
 671                                 status =
 672                                     acpi_ps_next_parse_state(walk_state, op,
 673                                                              status);
 674
 675                                 status2 =
 676                                     acpi_ps_complete_this_op(walk_state, op);
 677                                 if (ACPI_FAILURE(status2)) {
 678                                         return_ACPI_STATUS(status2);
 679                                 }
 680                                 op = NULL;
 681                         }
 682                         status = AE_OK;
 683                         break;
 684
 685                 case AE_CTRL_BREAK:
 686                 case AE_CTRL_CONTINUE:
 687
 688                         /* Pop off scopes until we find the While */
 689
 690                         while (!op || (op->common.aml_opcode != AML_WHILE_OP)) {
 691                                 acpi_ps_pop_scope(parser_state, &op,
 692                                                   &walk_state->arg_types,
 693                                                   &walk_state->arg_count);
 694
 695                                 if (op->common.aml_opcode != AML_WHILE_OP) {
 696                                         status2 =
 697                                             acpi_ds_result_stack_pop
 698                                             (walk_state);
 699                                         if (ACPI_FAILURE(status2)) {
 700                                                 return_ACPI_STATUS(status2);
 701                                         }
 702                                 }
 703                         }
 704
 705                         /* Close this iteration of the While loop */
 706
 707                         walk_state->op = op;
 708                         walk_state->op_info =
 709                             acpi_ps_get_opcode_info(op->common.aml_opcode);
 710                         walk_state->opcode = op->common.aml_opcode;
 711
 712                         status = walk_state->ascending_callback(walk_state);
 713                         status =
 714                             acpi_ps_next_parse_state(walk_state, op, status);
 715
 716                         status2 = acpi_ps_complete_this_op(walk_state, op);
 717                         if (ACPI_FAILURE(status2)) {
 718                                 return_ACPI_STATUS(status2);
 719                         }
 720                         op = NULL;
 721
 722                         status = AE_OK;
 723                         break;
 724
 725                 case AE_CTRL_TERMINATE:
 726
 727                         status = AE_OK;
 728
 729                         /* Clean up */
 730                         do {
 731                                 if (op) {
 732                                         status2 =
 733                                             acpi_ps_complete_this_op(walk_state,
 734                                                                      op);
 735                                         if (ACPI_FAILURE(status2)) {
 736                                                 return_ACPI_STATUS(status2);
 737                                         }
 738                                 }
 739                                 acpi_ps_pop_scope(parser_state, &op,
 740                                                   &walk_state->arg_types,
 741                                                   &walk_state->arg_count);
 742
 743                         } while (op);
 744
 745                         return_ACPI_STATUS(status);
 746
 747                 default:        /* All other non-AE_OK status */
 748
 749                         do {
 750                                 if (op) {
 751                                         status2 =
 752                                             acpi_ps_complete_this_op(walk_state,
 753                                                                      op);
 754                                         if (ACPI_FAILURE(status2)) {
 755                                                 return_ACPI_STATUS(status2);
 756                                         }
 757                                 }
 758                                 acpi_ps_pop_scope(parser_state, &op,
 759                                                   &walk_state->arg_types,
 760                                                   &walk_state->arg_count);
 761
 762                         } while (op);
 763
 764                         /*
 765                          * TBD: Cleanup parse ops on error
 766                          */
 767 #if 0
 768                         if (op == NULL) {
 769                                 acpi_ps_pop_scope(parser_state, &op,
 770                                                   &walk_state->arg_types,
 771                                                   &walk_state->arg_count);
 772                         }
 773 #endif
 774                         walk_state->prev_op = op;
 775                         walk_state->prev_arg_types = walk_state->arg_types;
 776                         return_ACPI_STATUS(status);
 777                 }
 778
 779                 /* This scope complete? */
 780
 781                 if (acpi_ps_has_completed_scope(parser_state)) {
 782                         acpi_ps_pop_scope(parser_state, &op,
 783                                           &walk_state->arg_types,
 784                                           &walk_state->arg_count);
 785                         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 786                                           "Popped scope, Op=%p\n", op));
 787                 } else {
 788                         op = NULL;
 789                 }
 790
 791         }                       /* while parser_state->Aml */
 792
 793         /*
 794          * Complete the last Op (if not completed), and clear the scope stack.
 795          * It is easily possible to end an AML "package" with an unbounded number
 796          * of open scopes (such as when several ASL blocks are closed with
 797          * sequential closing braces).  We want to terminate each one cleanly.
 798          */
 799         ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
 800                           op));
 801         do {
 802                 if (op) {
 803                         if (walk_state->ascending_callback != NULL) {
 804                                 walk_state->op = op;
 805                                 walk_state->op_info =
 806                                     acpi_ps_get_opcode_info(op->common.
 807                                                             aml_opcode);
 808                                 walk_state->opcode = op->common.aml_opcode;
 809
 810                                 status =
 811                                     walk_state->ascending_callback(walk_state);
 812                                 status =
 813                                     acpi_ps_next_parse_state(walk_state, op,
 814                                                              status);
 815                                 if (status == AE_CTRL_PENDING) {
 816                                         status = AE_OK;
 817                                         goto close_this_op;
 818                                 }
 819
 820                                 if (status == AE_CTRL_TERMINATE) {
 821                                         status = AE_OK;
 822
 823                                         /* Clean up */
 824                                         do {
 825                                                 if (op) {
 826                                                         status2 =
 827                                                             acpi_ps_complete_this_op
 828                                                             (walk_state, op);
 829                                                         if (ACPI_FAILURE
 830                                                             (status2)) {
 831                                                                 return_ACPI_STATUS
 832                                                                     (status2);
 833                                                         }
 834                                                 }
 835
 836                                                 acpi_ps_pop_scope(parser_state,
 837                                                                   &op,
 838                                                                   &walk_state->
 839                                                                   arg_types,
 840                                                                   &walk_state->
 841                                                                   arg_count);
 842
 843                                         } while (op);
 844
 845                                         return_ACPI_STATUS(status);
 846                                 }
 847
 848                                 else if (ACPI_FAILURE(status)) {
 849                                         /* First error is most important */
 850
 851                                         (void)
 852                                             acpi_ps_complete_this_op(walk_state,
 853                                                                      op);
 854                                         return_ACPI_STATUS(status);
 855                                 }
 856                         }
 857
 858                         status2 = acpi_ps_complete_this_op(walk_state, op);
 859                         if (ACPI_FAILURE(status2)) {
 860                                 return_ACPI_STATUS(status2);
 861                         }
 862                 }
 863
 864                 acpi_ps_pop_scope(parser_state, &op, &walk_state->arg_types,
 865                                   &walk_state->arg_count);
 866
 867         } while (op);
 868
 869         return_ACPI_STATUS(status);
 870 }