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