err.no Git - 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 - 2005, 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 /*
  46  * Parse the AML and build an operation tree as most interpreters,
  47  * like Perl, do.  Parsing is done by hand rather than with a YACC
  48  * generated parser to tightly constrain stack and dynamic memory
  49  * usage.  At the same time, parsing is kept flexible and the code
  50  * fairly compact by parsing based on a list of AML opcode
  51  * templates in aml_op_info[]
  52  */
  53
  54 #include <acpi/acpi.h>
  55 #include <acpi/acparser.h>
  56 #include <acpi/acdispat.h>
  57 #include <acpi/amlcode.h>
  58 #include <acpi/acnamesp.h>
  59 #include <acpi/acinterp.h>
  60
  61 #define _COMPONENT          ACPI_PARSER
  62          ACPI_MODULE_NAME    ("psloop")
  63
  64 static u32                          acpi_gbl_depth = 0;
  65
  66
  67 /*******************************************************************************
  68  *
  69  * FUNCTION:    acpi_ps_parse_loop
  70  *
  71  * PARAMETERS:  walk_state          - Current state
  72  *
  73  * RETURN:      Status
  74  *
  75  * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
  76  *              a tree of ops.
  77  *
  78  ******************************************************************************/
  79
  80 acpi_status
  81 acpi_ps_parse_loop (
  82         struct acpi_walk_state          *walk_state)
  83 {
  84         acpi_status                     status = AE_OK;
  85         acpi_status                     status2;
  86         union acpi_parse_object         *op = NULL;     /* current op */
  87         union acpi_parse_object         *arg = NULL;
  88         union acpi_parse_object         *pre_op = NULL;
  89         struct acpi_parse_state         *parser_state;
  90         u8                              *aml_op_start = NULL;
  91
  92
  93         ACPI_FUNCTION_TRACE_PTR ("ps_parse_loop", walk_state);
  94
  95         if (walk_state->descending_callback == NULL) {
  96                 return_ACPI_STATUS (AE_BAD_PARAMETER);
  97         }
  98
  99         parser_state = &walk_state->parser_state;
 100         walk_state->arg_types = 0;
 101
 102 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
 103
 104         if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
 105                 /* We are restarting a preempted control method */
 106
 107                 if (acpi_ps_has_completed_scope (parser_state)) {
 108                         /*
 109                          * We must check if a predicate to an IF or WHILE statement
 110                          * was just completed
 111                          */
 112                         if ((parser_state->scope->parse_scope.op) &&
 113                            ((parser_state->scope->parse_scope.op->common.aml_opcode == AML_IF_OP) ||
 114                                 (parser_state->scope->parse_scope.op->common.aml_opcode == AML_WHILE_OP)) &&
 115                                 (walk_state->control_state) &&
 116                                 (walk_state->control_state->common.state ==
 117                                         ACPI_CONTROL_PREDICATE_EXECUTING)) {
 118                                 /*
 119                                  * A predicate was just completed, get the value of the
 120                                  * predicate and branch based on that value
 121                                  */
 122                                 walk_state->op = NULL;
 123                                 status = acpi_ds_get_predicate_value (walk_state, ACPI_TO_POINTER (TRUE));
 124                                 if (ACPI_FAILURE (status) &&
 125                                         ((status & AE_CODE_MASK) != AE_CODE_CONTROL)) {
 126                                         if (status == AE_AML_NO_RETURN_VALUE) {
 127                                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 128                                                         "Invoked method did not return a value, %s\n",
 129                                                         acpi_format_exception (status)));
 130
 131                                         }
 132                                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 133                                                 "get_predicate Failed, %s\n",
 134                                                 acpi_format_exception (status)));
 135                                         return_ACPI_STATUS (status);
 136                                 }
 137
 138                                 status = acpi_ps_next_parse_state (walk_state, op, status);
 139                         }
 140
 141                         acpi_ps_pop_scope (parser_state, &op,
 142                                 &walk_state->arg_types, &walk_state->arg_count);
 143                         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op));
 144                 }
 145                 else if (walk_state->prev_op) {
 146                         /* We were in the middle of an op */
 147
 148                         op = walk_state->prev_op;
 149                         walk_state->arg_types = walk_state->prev_arg_types;
 150                 }
 151         }
 152 #endif
 153
 154         /* Iterative parsing loop, while there is more AML to process: */
 155
 156         while ((parser_state->aml < parser_state->aml_end) || (op)) {
 157                 aml_op_start = parser_state->aml;
 158                 if (!op) {
 159                         /* Get the next opcode from the AML stream */
 160
 161                         walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml,
 162                                           parser_state->aml_start);
 163                         walk_state->opcode   = acpi_ps_peek_opcode (parser_state);
 164
 165                         /*
 166                          * First cut to determine what we have found:
 167                          * 1) A valid AML opcode
 168                          * 2) A name string
 169                          * 3) An unknown/invalid opcode
 170                          */
 171                         walk_state->op_info = 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_DEBUG_PRINT ((ACPI_DB_ERROR,
 188                                         "Found unknown opcode %X at AML address %p offset %X, ignoring\n",
 189                                         walk_state->opcode, parser_state->aml, walk_state->aml_offset));
 190
 191                                 ACPI_DUMP_BUFFER (parser_state->aml, 128);
 192
 193                                 /* Assume one-byte bad opcode */
 194
 195                                 parser_state->aml++;
 196                                 continue;
 197
 198                         default:
 199
 200                                 /* Found opcode info, this is a normal opcode */
 201
 202                                 parser_state->aml += acpi_ps_get_opcode_size (walk_state->opcode);
 203                                 walk_state->arg_types = 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 = acpi_ps_alloc_op (walk_state->opcode);
 214                                         if (!pre_op) {
 215                                                 status = AE_NO_MEMORY;
 216                                                 goto close_this_op;
 217                                         }
 218                                 }
 219
 220                                 pre_op->common.value.arg = NULL;
 221                                 pre_op->common.aml_opcode = walk_state->opcode;
 222
 223                                 /*
 224                                  * Get and append arguments until we find the node that contains
 225                                  * the name (the type ARGP_NAME).
 226                                  */
 227                                 while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
 228                                           (GET_CURRENT_ARG_TYPE (walk_state->arg_types) != ARGP_NAME)) {
 229                                         status = acpi_ps_get_next_arg (walk_state, parser_state,
 230                                                          GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg);
 231                                         if (ACPI_FAILURE (status)) {
 232                                                 goto close_this_op;
 233                                         }
 234
 235                                         acpi_ps_append_arg (pre_op, arg);
 236                                         INCREMENT_ARG_LIST (walk_state->arg_types);
 237                                 }
 238
 239                                 /*
 240                                  * Make sure that we found a NAME and didn't run out of
 241                                  * arguments
 242                                  */
 243                                 if (!GET_CURRENT_ARG_TYPE (walk_state->arg_types)) {
 244                                         status = AE_AML_NO_OPERAND;
 245                                         goto close_this_op;
 246                                 }
 247
 248                                 /* We know that this arg is a name, move to next arg */
 249
 250                                 INCREMENT_ARG_LIST (walk_state->arg_types);
 251
 252                                 /*
 253                                  * Find the object.  This will either insert the object into
 254                                  * the namespace or simply look it up
 255                                  */
 256                                 walk_state->op = NULL;
 257
 258                                 status = walk_state->descending_callback (walk_state, &op);
 259                                 if (ACPI_FAILURE (status)) {
 260                                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 261                                                 "During name lookup/catalog, %s\n",
 262                                                 acpi_format_exception (status)));
 263                                         goto close_this_op;
 264                                 }
 265
 266                                 if (!op) {
 267                                         continue;
 268                                 }
 269
 270                                 status = acpi_ps_next_parse_state (walk_state, op, status);
 271                                 if (status == AE_CTRL_PENDING) {
 272                                         status = AE_OK;
 273                                         goto close_this_op;
 274                                 }
 275
 276                                 if (ACPI_FAILURE (status)) {
 277                                         goto close_this_op;
 278                                 }
 279
 280                                 acpi_ps_append_arg (op, pre_op->common.value.arg);
 281                                 acpi_gbl_depth++;
 282
 283                                 if (op->common.aml_opcode == AML_REGION_OP) {
 284                                         /*
 285                                          * Defer final parsing of an operation_region body,
 286                                          * because we don't have enough info in the first pass
 287                                          * to parse it correctly (i.e., there may be method
 288                                          * calls within the term_arg elements of the body.)
 289                                          *
 290                                          * However, we must continue parsing because
 291                                          * the opregion is not a standalone package --
 292                                          * we don't know where the end is at this point.
 293                                          *
 294                                          * (Length is unknown until parse of the body complete)
 295                                          */
 296                                         op->named.data    = aml_op_start;
 297                                         op->named.length  = 0;
 298                                 }
 299                         }
 300                         else {
 301                                 /* Not a named opcode, just allocate Op and append to parent */
 302
 303                                 walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode);
 304                                 op = acpi_ps_alloc_op (walk_state->opcode);
 305                                 if (!op) {
 306                                         status = AE_NO_MEMORY;
 307                                         goto close_this_op;
 308                                 }
 309
 310                                 if (walk_state->op_info->flags & AML_CREATE) {
 311                                         /*
 312                                          * Backup to beginning of create_xXXfield declaration
 313                                          * body_length is unknown until we parse the body
 314                                          */
 315                                         op->named.data    = aml_op_start;
 316                                         op->named.length  = 0;
 317                                 }
 318
 319                                 acpi_ps_append_arg (acpi_ps_get_parent_scope (parser_state), op);
 320
 321                                 if ((walk_state->descending_callback != NULL)) {
 322                                         /*
 323                                          * Find the object. This will either insert the object into
 324                                          * the namespace or simply look it up
 325                                          */
 326                                         walk_state->op = op;
 327
 328                                         status = walk_state->descending_callback (walk_state, &op);
 329                                         status = acpi_ps_next_parse_state (walk_state, op, status);
 330                                         if (status == AE_CTRL_PENDING) {
 331                                                 status = AE_OK;
 332                                                 goto close_this_op;
 333                                         }
 334
 335                                         if (ACPI_FAILURE (status)) {
 336                                                 goto close_this_op;
 337                                         }
 338                                 }
 339                         }
 340
 341                         op->common.aml_offset = walk_state->aml_offset;
 342
 343                         if (walk_state->op_info) {
 344                                 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 345                                         "Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n",
 346                                          (u32) op->common.aml_opcode, walk_state->op_info->name,
 347                                          op, parser_state->aml, op->common.aml_offset));
 348                         }
 349                 }
 350
 351
 352                 /*
 353                  * Start arg_count at zero because we don't know if there are
 354                  * any args yet
 355                  */
 356                 walk_state->arg_count = 0;
 357
 358                 /* Are there any arguments that must be processed? */
 359
 360                 if (walk_state->arg_types) {
 361                         /* Get arguments */
 362
 363                         switch (op->common.aml_opcode) {
 364                         case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
 365                         case AML_WORD_OP:       /* AML_WORDDATA_ARG */
 366                         case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
 367                         case AML_QWORD_OP:      /* AML_QWORDATA_ARG */
 368                         case AML_STRING_OP:     /* AML_ASCIICHARLIST_ARG */
 369
 370                                 /* Fill in constant or string argument directly */
 371
 372                                 acpi_ps_get_next_simple_arg (parser_state,
 373                                         GET_CURRENT_ARG_TYPE (walk_state->arg_types), op);
 374                                 break;
 375
 376                         case AML_INT_NAMEPATH_OP:   /* AML_NAMESTRING_ARG */
 377
 378                                 status = acpi_ps_get_next_namepath (walk_state, parser_state, op, 1);
 379                                 if (ACPI_FAILURE (status)) {
 380                                         goto close_this_op;
 381                                 }
 382
 383                                 walk_state->arg_types = 0;
 384                                 break;
 385
 386                         default:
 387                                 /*
 388                                  * Op is not a constant or string, append each argument
 389                                  * to the Op
 390                                  */
 391                                 while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
 392                                                 !walk_state->arg_count) {
 393                                         walk_state->aml_offset = (u32)
 394                                                 ACPI_PTR_DIFF (parser_state->aml, parser_state->aml_start);
 395
 396                                         status = acpi_ps_get_next_arg (walk_state, parser_state,
 397                                                          GET_CURRENT_ARG_TYPE (walk_state->arg_types),
 398                                                          &arg);
 399                                         if (ACPI_FAILURE (status)) {
 400                                                 goto close_this_op;
 401                                         }
 402
 403                                         if (arg) {
 404                                                 arg->common.aml_offset = walk_state->aml_offset;
 405                                                 acpi_ps_append_arg (op, arg);
 406                                         }
 407                                         INCREMENT_ARG_LIST (walk_state->arg_types);
 408                                 }
 409
 410                                 /* Special processing for certain opcodes */
 411
 412                                 if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS1) &&
 413                                    ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
 414                                         /*
 415                                          * We want to skip If/Else/While constructs during Pass1
 416                                          * because we want to actually conditionally execute the
 417                                          * code during Pass2.
 418                                          *
 419                                          * Except for disassembly, where we always want to
 420                                          * walk the If/Else/While packages
 421                                          */
 422                                         switch (op->common.aml_opcode) {
 423                                         case AML_IF_OP:
 424                                         case AML_ELSE_OP:
 425                                         case AML_WHILE_OP:
 426
 427                                                 /* Skip body of if/else/while in pass 1 */
 428
 429                                                 parser_state->aml   = parser_state->pkg_end;
 430                                                 walk_state->arg_count = 0;
 431                                                 break;
 432
 433                                         default:
 434                                                 break;
 435                                         }
 436                                 }
 437
 438                                 switch (op->common.aml_opcode) {
 439                                 case AML_METHOD_OP:
 440
 441                                         /*
 442                                          * Skip parsing of control method
 443                                          * because we don't have enough info in the first pass
 444                                          * to parse it correctly.
 445                                          *
 446                                          * Save the length and address of the body
 447                                          */
 448                                         op->named.data   = parser_state->aml;
 449                                         op->named.length = (u32) (parser_state->pkg_end -
 450                                                            parser_state->aml);
 451
 452                                         /* Skip body of method */
 453
 454                                         parser_state->aml   = parser_state->pkg_end;
 455                                         walk_state->arg_count = 0;
 456                                         break;
 457
 458                                 case AML_BUFFER_OP:
 459                                 case AML_PACKAGE_OP:
 460                                 case AML_VAR_PACKAGE_OP:
 461
 462                                         if ((op->common.parent) &&
 463                                                 (op->common.parent->common.aml_opcode == AML_NAME_OP) &&
 464                                                 (walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2)) {
 465                                                 /*
 466                                                  * Skip parsing of Buffers and Packages
 467                                                  * because we don't have enough info in the first pass
 468                                                  * to parse them correctly.
 469                                                  */
 470                                                 op->named.data   = aml_op_start;
 471                                                 op->named.length = (u32) (parser_state->pkg_end -
 472                                                                    aml_op_start);
 473
 474                                                 /* Skip body */
 475
 476                                                 parser_state->aml   = parser_state->pkg_end;
 477                                                 walk_state->arg_count = 0;
 478                                         }
 479                                         break;
 480
 481                                 case AML_WHILE_OP:
 482
 483                                         if (walk_state->control_state) {
 484                                                 walk_state->control_state->control.package_end =
 485                                                         parser_state->pkg_end;
 486                                         }
 487                                         break;
 488
 489                                 default:
 490
 491                                         /* No action for all other opcodes */
 492                                         break;
 493                                 }
 494                                 break;
 495                         }
 496                 }
 497
 498                 /* Check for arguments that need to be processed */
 499
 500                 if (walk_state->arg_count) {
 501                         /*
 502                          * There are arguments (complex ones), push Op and
 503                          * prepare for argument
 504                          */
 505                         status = acpi_ps_push_scope (parser_state, op,
 506                                          walk_state->arg_types, walk_state->arg_count);
 507                         if (ACPI_FAILURE (status)) {
 508                                 goto close_this_op;
 509                         }
 510                         op = NULL;
 511                         continue;
 512                 }
 513
 514                 /*
 515                  * All arguments have been processed -- Op is complete,
 516                  * prepare for next
 517                  */
 518                 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
 519                 if (walk_state->op_info->flags & AML_NAMED) {
 520                         if (acpi_gbl_depth) {
 521                                 acpi_gbl_depth--;
 522                         }
 523
 524                         if (op->common.aml_opcode == AML_REGION_OP) {
 525                                 /*
 526                                  * Skip parsing of control method or opregion body,
 527                                  * because we don't have enough info in the first pass
 528                                  * to parse them correctly.
 529                                  *
 530                                  * Completed parsing an op_region declaration, we now
 531                                  * know the length.
 532                                  */
 533                                 op->named.length = (u32) (parser_state->aml - op->named.data);
 534                         }
 535                 }
 536
 537                 if (walk_state->op_info->flags & AML_CREATE) {
 538                         /*
 539                          * Backup to beginning of create_xXXfield declaration (1 for
 540                          * Opcode)
 541                          *
 542                          * body_length is unknown until we parse the body
 543                          */
 544                         op->named.length = (u32) (parser_state->aml - op->named.data);
 545                 }
 546
 547                 /* This op complete, notify the dispatcher */
 548
 549                 if (walk_state->ascending_callback != NULL) {
 550                         walk_state->op    = op;
 551                         walk_state->opcode = op->common.aml_opcode;
 552
 553                         status = walk_state->ascending_callback (walk_state);
 554                         status = acpi_ps_next_parse_state (walk_state, op, status);
 555                         if (status == AE_CTRL_PENDING) {
 556                                 status = AE_OK;
 557                                 goto close_this_op;
 558                         }
 559                 }
 560
 561
 562 close_this_op:
 563                 /*
 564                  * Finished one argument of the containing scope
 565                  */
 566                 parser_state->scope->parse_scope.arg_count--;
 567
 568                 /* Finished with pre_op */
 569
 570                 if (pre_op) {
 571                         acpi_ps_free_op (pre_op);
 572                         pre_op = NULL;
 573                 }
 574
 575                 /* Close this Op (will result in parse subtree deletion) */
 576
 577                 status2 = acpi_ps_complete_this_op (walk_state, op);
 578                 if (ACPI_FAILURE (status2)) {
 579                         return_ACPI_STATUS (status2);
 580                 }
 581                 op = NULL;
 582
 583                 switch (status) {
 584                 case AE_OK:
 585                         break;
 586
 587
 588                 case AE_CTRL_TRANSFER:
 589
 590                         /* We are about to transfer to a called method. */
 591
 592                         walk_state->prev_op = op;
 593                         walk_state->prev_arg_types = walk_state->arg_types;
 594                         return_ACPI_STATUS (status);
 595
 596
 597                 case AE_CTRL_END:
 598
 599                         acpi_ps_pop_scope (parser_state, &op,
 600                                 &walk_state->arg_types, &walk_state->arg_count);
 601
 602                         if (op) {
 603                                 walk_state->op    = op;
 604                                 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
 605                                 walk_state->opcode = op->common.aml_opcode;
 606
 607                                 status = walk_state->ascending_callback (walk_state);
 608                                 status = acpi_ps_next_parse_state (walk_state, op, status);
 609
 610                                 status2 = acpi_ps_complete_this_op (walk_state, op);
 611                                 if (ACPI_FAILURE (status2)) {
 612                                         return_ACPI_STATUS (status2);
 613                                 }
 614                                 op = NULL;
 615                         }
 616                         status = AE_OK;
 617                         break;
 618
 619
 620                 case AE_CTRL_BREAK:
 621                 case AE_CTRL_CONTINUE:
 622
 623                         /* Pop off scopes until we find the While */
 624
 625                         while (!op || (op->common.aml_opcode != AML_WHILE_OP)) {
 626                                 acpi_ps_pop_scope (parser_state, &op,
 627                                         &walk_state->arg_types, &walk_state->arg_count);
 628                         }
 629
 630                         /* Close this iteration of the While loop */
 631
 632                         walk_state->op    = op;
 633                         walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
 634                         walk_state->opcode = op->common.aml_opcode;
 635
 636                         status = walk_state->ascending_callback (walk_state);
 637                         status = acpi_ps_next_parse_state (walk_state, op, status);
 638
 639                         status2 = acpi_ps_complete_this_op (walk_state, op);
 640                         if (ACPI_FAILURE (status2)) {
 641                                 return_ACPI_STATUS (status2);
 642                         }
 643                         op = NULL;
 644
 645                         status = AE_OK;
 646                         break;
 647
 648
 649                 case AE_CTRL_TERMINATE:
 650
 651                         status = AE_OK;
 652
 653                         /* Clean up */
 654                         do {
 655                                 if (op) {
 656                                         status2 = acpi_ps_complete_this_op (walk_state, op);
 657                                         if (ACPI_FAILURE (status2)) {
 658                                                 return_ACPI_STATUS (status2);
 659                                         }
 660                                 }
 661                                 acpi_ps_pop_scope (parser_state, &op,
 662                                         &walk_state->arg_types, &walk_state->arg_count);
 663
 664                         } while (op);
 665
 666                         return_ACPI_STATUS (status);
 667
 668
 669                 default:  /* All other non-AE_OK status */
 670
 671                         do {
 672                                 if (op) {
 673                                         status2 = acpi_ps_complete_this_op (walk_state, op);
 674                                         if (ACPI_FAILURE (status2)) {
 675                                                 return_ACPI_STATUS (status2);
 676                                         }
 677                                 }
 678                                 acpi_ps_pop_scope (parser_state, &op,
 679                                         &walk_state->arg_types, &walk_state->arg_count);
 680
 681                         } while (op);
 682
 683
 684                         /*
 685                          * TBD: Cleanup parse ops on error
 686                          */
 687 #if 0
 688                         if (op == NULL) {
 689                                 acpi_ps_pop_scope (parser_state, &op,
 690                                         &walk_state->arg_types, &walk_state->arg_count);
 691                         }
 692 #endif
 693                         walk_state->prev_op = op;
 694                         walk_state->prev_arg_types = walk_state->arg_types;
 695                         return_ACPI_STATUS (status);
 696                 }
 697
 698                 /* This scope complete? */
 699
 700                 if (acpi_ps_has_completed_scope (parser_state)) {
 701                         acpi_ps_pop_scope (parser_state, &op,
 702                                 &walk_state->arg_types, &walk_state->arg_count);
 703                         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op));
 704                 }
 705                 else {
 706                         op = NULL;
 707                 }
 708
 709         } /* while parser_state->Aml */
 710
 711
 712         /*
 713          * Complete the last Op (if not completed), and clear the scope stack.
 714          * It is easily possible to end an AML "package" with an unbounded number
 715          * of open scopes (such as when several ASL blocks are closed with
 716          * sequential closing braces).  We want to terminate each one cleanly.
 717          */
 718         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "AML package complete at Op %p\n", op));
 719         do {
 720                 if (op) {
 721                         if (walk_state->ascending_callback != NULL) {
 722                                 walk_state->op    = op;
 723                                 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
 724                                 walk_state->opcode = op->common.aml_opcode;
 725
 726                                 status = walk_state->ascending_callback (walk_state);
 727                                 status = acpi_ps_next_parse_state (walk_state, op, status);
 728                                 if (status == AE_CTRL_PENDING) {
 729                                         status = AE_OK;
 730                                         goto close_this_op;
 731                                 }
 732
 733                                 if (status == AE_CTRL_TERMINATE) {
 734                                         status = AE_OK;
 735
 736                                         /* Clean up */
 737                                         do {
 738                                                 if (op) {
 739                                                         status2 = acpi_ps_complete_this_op (walk_state, op);
 740                                                         if (ACPI_FAILURE (status2)) {
 741                                                                 return_ACPI_STATUS (status2);
 742                                                         }
 743                                                 }
 744
 745                                                 acpi_ps_pop_scope (parser_state, &op,
 746                                                         &walk_state->arg_types, &walk_state->arg_count);
 747
 748                                         } while (op);
 749
 750                                         return_ACPI_STATUS (status);
 751                                 }
 752
 753                                 else if (ACPI_FAILURE (status)) {
 754                                         /* First error is most important */
 755
 756                                         (void) acpi_ps_complete_this_op (walk_state, op);
 757                                         return_ACPI_STATUS (status);
 758                                 }
 759                         }
 760
 761                         status2 = acpi_ps_complete_this_op (walk_state, op);
 762                         if (ACPI_FAILURE (status2)) {
 763                                 return_ACPI_STATUS (status2);
 764                         }
 765                 }
 766
 767                 acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types,
 768                         &walk_state->arg_count);
 769
 770         } while (op);
 771
 772         return_ACPI_STATUS (status);
 773 }
 774
 775