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  * 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_DEBUG_PRINT((ACPI_DB_ERROR,
 127                                                                   "Invoked method did not return a value, %s\n",
 128                                                                   acpi_format_exception
 129                                                                   (status)));
 130
 131                                         }
 132                                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 133                                                           "get_predicate Failed, %s\n",
 134                                                           acpi_format_exception
 135                                                           (status)));
 136                                         return_ACPI_STATUS(status);
 137                                 }
 138
 139                                 status =
 140                                     acpi_ps_next_parse_state(walk_state, op,
 141                                                              status);
 142                         }
 143
 144                         acpi_ps_pop_scope(parser_state, &op,
 145                                           &walk_state->arg_types,
 146                                           &walk_state->arg_count);
 147                         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 148                                           "Popped scope, Op=%p\n", op));
 149                 } else if (walk_state->prev_op) {
 150                         /* We were in the middle of an op */
 151
 152                         op = walk_state->prev_op;
 153                         walk_state->arg_types = walk_state->prev_arg_types;
 154                 }
 155         }
 156 #endif
 157
 158         /* Iterative parsing loop, while there is more AML to process: */
 159
 160         while ((parser_state->aml < parser_state->aml_end) || (op)) {
 161                 aml_op_start = parser_state->aml;
 162                 if (!op) {
 163                         /* Get the next opcode from the AML stream */
 164
 165                         walk_state->aml_offset =
 166                             (u32) ACPI_PTR_DIFF(parser_state->aml,
 167                                                 parser_state->aml_start);
 168                         walk_state->opcode = acpi_ps_peek_opcode(parser_state);
 169
 170                         /*
 171                          * First cut to determine what we have found:
 172                          * 1) A valid AML opcode
 173                          * 2) A name string
 174                          * 3) An unknown/invalid opcode
 175                          */
 176                         walk_state->op_info =
 177                             acpi_ps_get_opcode_info(walk_state->opcode);
 178                         switch (walk_state->op_info->class) {
 179                         case AML_CLASS_ASCII:
 180                         case AML_CLASS_PREFIX:
 181                                 /*
 182                                  * Starts with a valid prefix or ASCII char, this is a name
 183                                  * string.  Convert the bare name string to a namepath.
 184                                  */
 185                                 walk_state->opcode = AML_INT_NAMEPATH_OP;
 186                                 walk_state->arg_types = ARGP_NAMESTRING;
 187                                 break;
 188
 189                         case AML_CLASS_UNKNOWN:
 190
 191                                 /* The opcode is unrecognized.  Just skip unknown opcodes */
 192
 193                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 194                                                   "Found unknown opcode %X at AML address %p offset %X, ignoring\n",
 195                                                   walk_state->opcode,
 196                                                   parser_state->aml,
 197                                                   walk_state->aml_offset));
 198
 199                                 ACPI_DUMP_BUFFER(parser_state->aml, 128);
 200
 201                                 /* Assume one-byte bad opcode */
 202
 203                                 parser_state->aml++;
 204                                 continue;
 205
 206                         default:
 207
 208                                 /* Found opcode info, this is a normal opcode */
 209
 210                                 parser_state->aml +=
 211                                     acpi_ps_get_opcode_size(walk_state->opcode);
 212                                 walk_state->arg_types =
 213                                     walk_state->op_info->parse_args;
 214                                 break;
 215                         }
 216
 217                         /* Create Op structure and append to parent's argument list */
 218
 219                         if (walk_state->op_info->flags & AML_NAMED) {
 220                                 /* Allocate a new pre_op if necessary */
 221
 222                                 if (!pre_op) {
 223                                         pre_op =
 224                                             acpi_ps_alloc_op(walk_state->
 225                                                              opcode);
 226                                         if (!pre_op) {
 227                                                 status = AE_NO_MEMORY;
 228                                                 goto close_this_op;
 229                                         }
 230                                 }
 231
 232                                 pre_op->common.value.arg = NULL;
 233                                 pre_op->common.aml_opcode = walk_state->opcode;
 234
 235                                 /*
 236                                  * Get and append arguments until we find the node that contains
 237                                  * the name (the type ARGP_NAME).
 238                                  */
 239                                 while (GET_CURRENT_ARG_TYPE
 240                                        (walk_state->arg_types)
 241                                        &&
 242                                        (GET_CURRENT_ARG_TYPE
 243                                         (walk_state->arg_types) != ARGP_NAME)) {
 244                                         status =
 245                                             acpi_ps_get_next_arg(walk_state,
 246                                                                  parser_state,
 247                                                                  GET_CURRENT_ARG_TYPE
 248                                                                  (walk_state->
 249                                                                   arg_types),
 250                                                                  &arg);
 251                                         if (ACPI_FAILURE(status)) {
 252                                                 goto close_this_op;
 253                                         }
 254
 255                                         acpi_ps_append_arg(pre_op, arg);
 256                                         INCREMENT_ARG_LIST(walk_state->
 257                                                            arg_types);
 258                                 }
 259
 260                                 /*
 261                                  * Make sure that we found a NAME and didn't run out of
 262                                  * arguments
 263                                  */
 264                                 if (!GET_CURRENT_ARG_TYPE
 265                                     (walk_state->arg_types)) {
 266                                         status = AE_AML_NO_OPERAND;
 267                                         goto close_this_op;
 268                                 }
 269
 270                                 /* We know that this arg is a name, move to next arg */
 271
 272                                 INCREMENT_ARG_LIST(walk_state->arg_types);
 273
 274                                 /*
 275                                  * Find the object.  This will either insert the object into
 276                                  * the namespace or simply look it up
 277                                  */
 278                                 walk_state->op = NULL;
 279
 280                                 status =
 281                                     walk_state->descending_callback(walk_state,
 282                                                                     &op);
 283                                 if (ACPI_FAILURE(status)) {
 284                                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 285                                                           "During name lookup/catalog, %s\n",
 286                                                           acpi_format_exception
 287                                                           (status)));
 288                                         goto close_this_op;
 289                                 }
 290
 291                                 if (!op) {
 292                                         continue;
 293                                 }
 294
 295                                 status =
 296                                     acpi_ps_next_parse_state(walk_state, op,
 297                                                              status);
 298                                 if (status == AE_CTRL_PENDING) {
 299                                         status = AE_OK;
 300                                         goto close_this_op;
 301                                 }
 302
 303                                 if (ACPI_FAILURE(status)) {
 304                                         goto close_this_op;
 305                                 }
 306
 307                                 acpi_ps_append_arg(op,
 308                                                    pre_op->common.value.arg);
 309                                 acpi_gbl_depth++;
 310
 311                                 if (op->common.aml_opcode == AML_REGION_OP) {
 312                                         /*
 313                                          * Defer final parsing of an operation_region body,
 314                                          * because we don't have enough info in the first pass
 315                                          * to parse it correctly (i.e., there may be method
 316                                          * calls within the term_arg elements of the body.)
 317                                          *
 318                                          * However, we must continue parsing because
 319                                          * the opregion is not a standalone package --
 320                                          * we don't know where the end is at this point.
 321                                          *
 322                                          * (Length is unknown until parse of the body complete)
 323                                          */
 324                                         op->named.data = aml_op_start;
 325                                         op->named.length = 0;
 326                                 }
 327                         } else {
 328                                 /* Not a named opcode, just allocate Op and append to parent */
 329
 330                                 walk_state->op_info =
 331                                     acpi_ps_get_opcode_info(walk_state->opcode);
 332                                 op = acpi_ps_alloc_op(walk_state->opcode);
 333                                 if (!op) {
 334                                         status = AE_NO_MEMORY;
 335                                         goto close_this_op;
 336                                 }
 337
 338                                 if (walk_state->op_info->flags & AML_CREATE) {
 339                                         /*
 340                                          * Backup to beginning of create_xXXfield declaration
 341                                          * body_length is unknown until we parse the body
 342                                          */
 343                                         op->named.data = aml_op_start;
 344                                         op->named.length = 0;
 345                                 }
 346
 347                                 acpi_ps_append_arg(acpi_ps_get_parent_scope
 348                                                    (parser_state), op);
 349
 350                                 if ((walk_state->descending_callback != NULL)) {
 351                                         /*
 352                                          * Find the object. This will either insert the object into
 353                                          * the namespace or simply look it up
 354                                          */
 355                                         walk_state->op = op;
 356
 357                                         status =
 358                                             walk_state->
 359                                             descending_callback(walk_state,
 360                                                                 &op);
 361                                         status =
 362                                             acpi_ps_next_parse_state(walk_state,
 363                                                                      op,
 364                                                                      status);
 365                                         if (status == AE_CTRL_PENDING) {
 366                                                 status = AE_OK;
 367                                                 goto close_this_op;
 368                                         }
 369
 370                                         if (ACPI_FAILURE(status)) {
 371                                                 goto close_this_op;
 372                                         }
 373                                 }
 374                         }
 375
 376                         op->common.aml_offset = walk_state->aml_offset;
 377
 378                         if (walk_state->op_info) {
 379                                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 380                                                   "Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n",
 381                                                   (u32) op->common.aml_opcode,
 382                                                   walk_state->op_info->name, op,
 383                                                   parser_state->aml,
 384                                                   op->common.aml_offset));
 385                         }
 386                 }
 387
 388                 /*
 389                  * Start arg_count at zero because we don't know if there are
 390                  * any args yet
 391                  */
 392                 walk_state->arg_count = 0;
 393
 394                 /* Are there any arguments that must be processed? */
 395
 396                 if (walk_state->arg_types) {
 397                         /* Get arguments */
 398
 399                         switch (op->common.aml_opcode) {
 400                         case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
 401                         case AML_WORD_OP:       /* AML_WORDDATA_ARG */
 402                         case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
 403                         case AML_QWORD_OP:      /* AML_QWORDATA_ARG */
 404                         case AML_STRING_OP:     /* AML_ASCIICHARLIST_ARG */
 405
 406                                 /* Fill in constant or string argument directly */
 407
 408                                 acpi_ps_get_next_simple_arg(parser_state,
 409                                                             GET_CURRENT_ARG_TYPE
 410                                                             (walk_state->
 411                                                              arg_types), op);
 412                                 break;
 413
 414                         case AML_INT_NAMEPATH_OP:       /* AML_NAMESTRING_ARG */
 415
 416                                 status =
 417                                     acpi_ps_get_next_namepath(walk_state,
 418                                                               parser_state, op,
 419                                                               1);
 420                                 if (ACPI_FAILURE(status)) {
 421                                         goto close_this_op;
 422                                 }
 423
 424                                 walk_state->arg_types = 0;
 425                                 break;
 426
 427                         default:
 428                                 /*
 429                                  * Op is not a constant or string, append each argument
 430                                  * to the Op
 431                                  */
 432                                 while (GET_CURRENT_ARG_TYPE
 433                                        (walk_state->arg_types)
 434                                        && !walk_state->arg_count) {
 435                                         walk_state->aml_offset = (u32)
 436                                             ACPI_PTR_DIFF(parser_state->aml,
 437                                                           parser_state->
 438                                                           aml_start);
 439
 440                                         status =
 441                                             acpi_ps_get_next_arg(walk_state,
 442                                                                  parser_state,
 443                                                                  GET_CURRENT_ARG_TYPE
 444                                                                  (walk_state->
 445                                                                   arg_types),
 446                                                                  &arg);
 447                                         if (ACPI_FAILURE(status)) {
 448                                                 goto close_this_op;
 449                                         }
 450
 451                                         if (arg) {
 452                                                 arg->common.aml_offset =
 453                                                     walk_state->aml_offset;
 454                                                 acpi_ps_append_arg(op, arg);
 455                                         }
 456                                         INCREMENT_ARG_LIST(walk_state->
 457                                                            arg_types);
 458                                 }
 459
 460                                 /* Special processing for certain opcodes */
 461
 462                                 /* TBD (remove): Temporary mechanism to disable this code if needed */
 463
 464 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 465
 466                                 if ((walk_state->pass_number <=
 467                                      ACPI_IMODE_LOAD_PASS1)
 468                                     &&
 469                                     ((walk_state->
 470                                       parse_flags & ACPI_PARSE_DISASSEMBLE) ==
 471                                      0)) {
 472                                         /*
 473                                          * We want to skip If/Else/While constructs during Pass1
 474                                          * because we want to actually conditionally execute the
 475                                          * code during Pass2.
 476                                          *
 477                                          * Except for disassembly, where we always want to
 478                                          * walk the If/Else/While packages
 479                                          */
 480                                         switch (op->common.aml_opcode) {
 481                                         case AML_IF_OP:
 482                                         case AML_ELSE_OP:
 483                                         case AML_WHILE_OP:
 484
 485                                                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 486                                                                   "Pass1: Skipping an If/Else/While body\n"));
 487
 488                                                 /* Skip body of if/else/while in pass 1 */
 489
 490                                                 parser_state->aml =
 491                                                     parser_state->pkg_end;
 492                                                 walk_state->arg_count = 0;
 493                                                 break;
 494
 495                                         default:
 496                                                 break;
 497                                         }
 498                                 }
 499 #endif
 500                                 switch (op->common.aml_opcode) {
 501                                 case AML_METHOD_OP:
 502
 503                                         /*
 504                                          * Skip parsing of control method
 505                                          * because we don't have enough info in the first pass
 506                                          * to parse it correctly.
 507                                          *
 508                                          * Save the length and address of the body
 509                                          */
 510                                         op->named.data = parser_state->aml;
 511                                         op->named.length =
 512                                             (u32) (parser_state->pkg_end -
 513                                                    parser_state->aml);
 514
 515                                         /* Skip body of method */
 516
 517                                         parser_state->aml =
 518                                             parser_state->pkg_end;
 519                                         walk_state->arg_count = 0;
 520                                         break;
 521
 522                                 case AML_BUFFER_OP:
 523                                 case AML_PACKAGE_OP:
 524                                 case AML_VAR_PACKAGE_OP:
 525
 526                                         if ((op->common.parent) &&
 527                                             (op->common.parent->common.
 528                                              aml_opcode == AML_NAME_OP)
 529                                             && (walk_state->pass_number <=
 530                                                 ACPI_IMODE_LOAD_PASS2)) {
 531                                                 /*
 532                                                  * Skip parsing of Buffers and Packages
 533                                                  * because we don't have enough info in the first pass
 534                                                  * to parse them correctly.
 535                                                  */
 536                                                 op->named.data = aml_op_start;
 537                                                 op->named.length =
 538                                                     (u32) (parser_state->
 539                                                            pkg_end -
 540                                                            aml_op_start);
 541
 542                                                 /* Skip body */
 543
 544                                                 parser_state->aml =
 545                                                     parser_state->pkg_end;
 546                                                 walk_state->arg_count = 0;
 547                                         }
 548                                         break;
 549
 550                                 case AML_WHILE_OP:
 551
 552                                         if (walk_state->control_state) {
 553                                                 walk_state->control_state->
 554                                                     control.package_end =
 555                                                     parser_state->pkg_end;
 556                                         }
 557                                         break;
 558
 559                                 default:
 560
 561                                         /* No action for all other opcodes */
 562                                         break;
 563                                 }
 564                                 break;
 565                         }
 566                 }
 567
 568                 /* Check for arguments that need to be processed */
 569
 570                 if (walk_state->arg_count) {
 571                         /*
 572                          * There are arguments (complex ones), push Op and
 573                          * prepare for argument
 574                          */
 575                         status = acpi_ps_push_scope(parser_state, op,
 576                                                     walk_state->arg_types,
 577                                                     walk_state->arg_count);
 578                         if (ACPI_FAILURE(status)) {
 579                                 goto close_this_op;
 580                         }
 581                         op = NULL;
 582                         continue;
 583                 }
 584
 585                 /*
 586                  * All arguments have been processed -- Op is complete,
 587                  * prepare for next
 588                  */
 589                 walk_state->op_info =
 590                     acpi_ps_get_opcode_info(op->common.aml_opcode);
 591                 if (walk_state->op_info->flags & AML_NAMED) {
 592                         if (acpi_gbl_depth) {
 593                                 acpi_gbl_depth--;
 594                         }
 595
 596                         if (op->common.aml_opcode == AML_REGION_OP) {
 597                                 /*
 598                                  * Skip parsing of control method or opregion body,
 599                                  * because we don't have enough info in the first pass
 600                                  * to parse them correctly.
 601                                  *
 602                                  * Completed parsing an op_region declaration, we now
 603                                  * know the length.
 604                                  */
 605                                 op->named.length =
 606                                     (u32) (parser_state->aml - op->named.data);
 607                         }
 608                 }
 609
 610                 if (walk_state->op_info->flags & AML_CREATE) {
 611                         /*
 612                          * Backup to beginning of create_xXXfield declaration (1 for
 613                          * Opcode)
 614                          *
 615                          * body_length is unknown until we parse the body
 616                          */
 617                         op->named.length =
 618                             (u32) (parser_state->aml - op->named.data);
 619                 }
 620
 621                 /* This op complete, notify the dispatcher */
 622
 623                 if (walk_state->ascending_callback != NULL) {
 624                         walk_state->op = op;
 625                         walk_state->opcode = op->common.aml_opcode;
 626
 627                         status = walk_state->ascending_callback(walk_state);
 628                         status =
 629                             acpi_ps_next_parse_state(walk_state, op, status);
 630                         if (status == AE_CTRL_PENDING) {
 631                                 status = AE_OK;
 632                                 goto close_this_op;
 633                         }
 634                 }
 635
 636               close_this_op:
 637                 /*
 638                  * Finished one argument of the containing scope
 639                  */
 640                 parser_state->scope->parse_scope.arg_count--;
 641
 642                 /* Finished with pre_op */
 643
 644                 if (pre_op) {
 645                         acpi_ps_free_op(pre_op);
 646                         pre_op = NULL;
 647                 }
 648
 649                 /* Close this Op (will result in parse subtree deletion) */
 650
 651                 status2 = acpi_ps_complete_this_op(walk_state, op);
 652                 if (ACPI_FAILURE(status2)) {
 653                         return_ACPI_STATUS(status2);
 654                 }
 655                 op = NULL;
 656
 657                 switch (status) {
 658                 case AE_OK:
 659                         break;
 660
 661                 case AE_CTRL_TRANSFER:
 662
 663                         /* We are about to transfer to a called method. */
 664
 665                         walk_state->prev_op = op;
 666                         walk_state->prev_arg_types = walk_state->arg_types;
 667                         return_ACPI_STATUS(status);
 668
 669                 case AE_CTRL_END:
 670
 671                         acpi_ps_pop_scope(parser_state, &op,
 672                                           &walk_state->arg_types,
 673                                           &walk_state->arg_count);
 674
 675                         if (op) {
 676                                 walk_state->op = op;
 677                                 walk_state->op_info =
 678                                     acpi_ps_get_opcode_info(op->common.
 679                                                             aml_opcode);
 680                                 walk_state->opcode = op->common.aml_opcode;
 681
 682                                 status =
 683                                     walk_state->ascending_callback(walk_state);
 684                                 status =
 685                                     acpi_ps_next_parse_state(walk_state, op,
 686                                                              status);
 687
 688                                 status2 =
 689                                     acpi_ps_complete_this_op(walk_state, op);
 690                                 if (ACPI_FAILURE(status2)) {
 691                                         return_ACPI_STATUS(status2);
 692                                 }
 693                                 op = NULL;
 694                         }
 695                         status = AE_OK;
 696                         break;
 697
 698                 case AE_CTRL_BREAK:
 699                 case AE_CTRL_CONTINUE:
 700
 701                         /* Pop off scopes until we find the While */
 702
 703                         while (!op || (op->common.aml_opcode != AML_WHILE_OP)) {
 704                                 acpi_ps_pop_scope(parser_state, &op,
 705                                                   &walk_state->arg_types,
 706                                                   &walk_state->arg_count);
 707                         }
 708
 709                         /* Close this iteration of the While loop */
 710
 711                         walk_state->op = op;
 712                         walk_state->op_info =
 713                             acpi_ps_get_opcode_info(op->common.aml_opcode);
 714                         walk_state->opcode = op->common.aml_opcode;
 715
 716                         status = walk_state->ascending_callback(walk_state);
 717                         status =
 718                             acpi_ps_next_parse_state(walk_state, op, status);
 719
 720                         status2 = acpi_ps_complete_this_op(walk_state, op);
 721                         if (ACPI_FAILURE(status2)) {
 722                                 return_ACPI_STATUS(status2);
 723                         }
 724                         op = NULL;
 725
 726                         status = AE_OK;
 727                         break;
 728
 729                 case AE_CTRL_TERMINATE:
 730
 731                         status = AE_OK;
 732
 733                         /* Clean up */
 734                         do {
 735                                 if (op) {
 736                                         status2 =
 737                                             acpi_ps_complete_this_op(walk_state,
 738                                                                      op);
 739                                         if (ACPI_FAILURE(status2)) {
 740                                                 return_ACPI_STATUS(status2);
 741                                         }
 742                                 }
 743                                 acpi_ps_pop_scope(parser_state, &op,
 744                                                   &walk_state->arg_types,
 745                                                   &walk_state->arg_count);
 746
 747                         } while (op);
 748
 749                         return_ACPI_STATUS(status);
 750
 751                 default:        /* All other non-AE_OK status */
 752
 753                         do {
 754                                 if (op) {
 755                                         status2 =
 756                                             acpi_ps_complete_this_op(walk_state,
 757                                                                      op);
 758                                         if (ACPI_FAILURE(status2)) {
 759                                                 return_ACPI_STATUS(status2);
 760                                         }
 761                                 }
 762                                 acpi_ps_pop_scope(parser_state, &op,
 763                                                   &walk_state->arg_types,
 764                                                   &walk_state->arg_count);
 765
 766                         } while (op);
 767
 768                         /*
 769                          * TBD: Cleanup parse ops on error
 770                          */
 771 #if 0
 772                         if (op == NULL) {
 773                                 acpi_ps_pop_scope(parser_state, &op,
 774                                                   &walk_state->arg_types,
 775                                                   &walk_state->arg_count);
 776                         }
 777 #endif
 778                         walk_state->prev_op = op;
 779                         walk_state->prev_arg_types = walk_state->arg_types;
 780                         return_ACPI_STATUS(status);
 781                 }
 782
 783                 /* This scope complete? */
 784
 785                 if (acpi_ps_has_completed_scope(parser_state)) {
 786                         acpi_ps_pop_scope(parser_state, &op,
 787                                           &walk_state->arg_types,
 788                                           &walk_state->arg_count);
 789                         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 790                                           "Popped scope, Op=%p\n", op));
 791                 } else {
 792                         op = NULL;
 793                 }
 794
 795         }                       /* while parser_state->Aml */
 796
 797         /*
 798          * Complete the last Op (if not completed), and clear the scope stack.
 799          * It is easily possible to end an AML "package" with an unbounded number
 800          * of open scopes (such as when several ASL blocks are closed with
 801          * sequential closing braces).  We want to terminate each one cleanly.
 802          */
 803         ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
 804                           op));
 805         do {
 806                 if (op) {
 807                         if (walk_state->ascending_callback != NULL) {
 808                                 walk_state->op = op;
 809                                 walk_state->op_info =
 810                                     acpi_ps_get_opcode_info(op->common.
 811                                                             aml_opcode);
 812                                 walk_state->opcode = op->common.aml_opcode;
 813
 814                                 status =
 815                                     walk_state->ascending_callback(walk_state);
 816                                 status =
 817                                     acpi_ps_next_parse_state(walk_state, op,
 818                                                              status);
 819                                 if (status == AE_CTRL_PENDING) {
 820                                         status = AE_OK;
 821                                         goto close_this_op;
 822                                 }
 823
 824                                 if (status == AE_CTRL_TERMINATE) {
 825                                         status = AE_OK;
 826
 827                                         /* Clean up */
 828                                         do {
 829                                                 if (op) {
 830                                                         status2 =
 831                                                             acpi_ps_complete_this_op
 832                                                             (walk_state, op);
 833                                                         if (ACPI_FAILURE
 834                                                             (status2)) {
 835                                                                 return_ACPI_STATUS
 836                                                                     (status2);
 837                                                         }
 838                                                 }
 839
 840                                                 acpi_ps_pop_scope(parser_state,
 841                                                                   &op,
 842                                                                   &walk_state->
 843                                                                   arg_types,
 844                                                                   &walk_state->
 845                                                                   arg_count);
 846
 847                                         } while (op);
 848
 849                                         return_ACPI_STATUS(status);
 850                                 }
 851
 852                                 else if (ACPI_FAILURE(status)) {
 853                                         /* First error is most important */
 854
 855                                         (void)
 856                                             acpi_ps_complete_this_op(walk_state,
 857                                                                      op);
 858                                         return_ACPI_STATUS(status);
 859                                 }
 860                         }
 861
 862                         status2 = acpi_ps_complete_this_op(walk_state, op);
 863                         if (ACPI_FAILURE(status2)) {
 864                                 return_ACPI_STATUS(status2);
 865                         }
 866                 }
 867
 868                 acpi_ps_pop_scope(parser_state, &op, &walk_state->arg_types,
 869                                   &walk_state->arg_count);
 870
 871         } while (op);
 872
 873         return_ACPI_STATUS(status);
 874 }