git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/dispatcher/dswstate.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswstate - Dispatcher parse tree walk management routines
   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 #include <acpi/acpi.h>
  45 #include <acpi/acparser.h>
  46 #include <acpi/acdispat.h>
  47 #include <acpi/acnamesp.h>
  48
  49 #define _COMPONENT          ACPI_DISPATCHER
  50 ACPI_MODULE_NAME("dswstate")
  51
  52 /* Local prototypes */
  53 #ifdef ACPI_OBSOLETE_FUNCTIONS
  54 acpi_status
  55 acpi_ds_result_insert(void *object,
  56                       u32 index, struct acpi_walk_state *walk_state);
  57
  58 acpi_status acpi_ds_obj_stack_delete_all(struct acpi_walk_state *walk_state);
  59
  60 acpi_status
  61 acpi_ds_obj_stack_pop_object(union acpi_operand_object **object,
  62                              struct acpi_walk_state *walk_state);
  63
  64 void *acpi_ds_obj_stack_get_value(u32 index,
  65                                   struct acpi_walk_state *walk_state);
  66 #endif
  67
  68 #ifdef ACPI_FUTURE_USAGE
  69
  70 /*******************************************************************************
  71  *
  72  * FUNCTION:    acpi_ds_result_remove
  73  *
  74  * PARAMETERS:  Object              - Where to return the popped object
  75  *              Index               - Where to extract the object
  76  *              walk_state          - Current Walk state
  77  *
  78  * RETURN:      Status
  79  *
  80  * DESCRIPTION: Pop an object off the bottom of this walk's result stack.  In
  81  *              other words, this is a FIFO.
  82  *
  83  ******************************************************************************/
  84
  85 acpi_status
  86 acpi_ds_result_remove(union acpi_operand_object **object,
  87                       u32 index, struct acpi_walk_state *walk_state)
  88 {
  89         union acpi_generic_state *state;
  90
  91         ACPI_FUNCTION_NAME("ds_result_remove");
  92
  93         state = walk_state->results;
  94         if (!state) {
  95                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  96                                   "No result object pushed! State=%p\n",
  97                                   walk_state));
  98                 return (AE_NOT_EXIST);
  99         }
 100
 101         if (index >= ACPI_OBJ_MAX_OPERAND) {
 102                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 103                                   "Index out of range: %X State=%p Num=%X\n",
 104                                   index, walk_state,
 105                                   state->results.num_results));
 106         }
 107
 108         /* Check for a valid result object */
 109
 110         if (!state->results.obj_desc[index]) {
 111                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 112                                   "Null operand! State=%p #Ops=%X, Index=%X\n",
 113                                   walk_state, state->results.num_results,
 114                                   index));
 115                 return (AE_AML_NO_RETURN_VALUE);
 116         }
 117
 118         /* Remove the object */
 119
 120         state->results.num_results--;
 121
 122         *object = state->results.obj_desc[index];
 123         state->results.obj_desc[index] = NULL;
 124
 125         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 126                           "Obj=%p [%s] Index=%X State=%p Num=%X\n",
 127                           *object,
 128                           (*object) ? acpi_ut_get_object_type_name(*object) :
 129                           "NULL", index, walk_state,
 130                           state->results.num_results));
 131
 132         return (AE_OK);
 133 }
 134
 135 #endif                          /*  ACPI_FUTURE_USAGE  */
 136
 137 /*******************************************************************************
 138  *
 139  * FUNCTION:    acpi_ds_result_pop
 140  *
 141  * PARAMETERS:  Object              - Where to return the popped object
 142  *              walk_state          - Current Walk state
 143  *
 144  * RETURN:      Status
 145  *
 146  * DESCRIPTION: Pop an object off the bottom of this walk's result stack.  In
 147  *              other words, this is a FIFO.
 148  *
 149  ******************************************************************************/
 150
 151 acpi_status
 152 acpi_ds_result_pop(union acpi_operand_object ** object,
 153                    struct acpi_walk_state * walk_state)
 154 {
 155         acpi_native_uint index;
 156         union acpi_generic_state *state;
 157
 158         ACPI_FUNCTION_NAME("ds_result_pop");
 159
 160         state = walk_state->results;
 161         if (!state) {
 162                 return (AE_OK);
 163         }
 164
 165         if (!state->results.num_results) {
 166                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 167                                   "Result stack is empty! State=%p\n",
 168                                   walk_state));
 169                 return (AE_AML_NO_RETURN_VALUE);
 170         }
 171
 172         /* Remove top element */
 173
 174         state->results.num_results--;
 175
 176         for (index = ACPI_OBJ_NUM_OPERANDS; index; index--) {
 177                 /* Check for a valid result object */
 178
 179                 if (state->results.obj_desc[index - 1]) {
 180                         *object = state->results.obj_desc[index - 1];
 181                         state->results.obj_desc[index - 1] = NULL;
 182
 183                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 184                                           "Obj=%p [%s] Index=%X State=%p Num=%X\n",
 185                                           *object,
 186                                           (*object) ?
 187                                           acpi_ut_get_object_type_name(*object)
 188                                           : "NULL", (u32) index - 1, walk_state,
 189                                           state->results.num_results));
 190
 191                         return (AE_OK);
 192                 }
 193         }
 194
 195         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 196                           "No result objects! State=%p\n", walk_state));
 197         return (AE_AML_NO_RETURN_VALUE);
 198 }
 199
 200 /*******************************************************************************
 201  *
 202  * FUNCTION:    acpi_ds_result_pop_from_bottom
 203  *
 204  * PARAMETERS:  Object              - Where to return the popped object
 205  *              walk_state          - Current Walk state
 206  *
 207  * RETURN:      Status
 208  *
 209  * DESCRIPTION: Pop an object off the bottom of this walk's result stack.  In
 210  *              other words, this is a FIFO.
 211  *
 212  ******************************************************************************/
 213
 214 acpi_status
 215 acpi_ds_result_pop_from_bottom(union acpi_operand_object ** object,
 216                                struct acpi_walk_state * walk_state)
 217 {
 218         acpi_native_uint index;
 219         union acpi_generic_state *state;
 220
 221         ACPI_FUNCTION_NAME("ds_result_pop_from_bottom");
 222
 223         state = walk_state->results;
 224         if (!state) {
 225                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 226                                   "Warning: No result object pushed! State=%p\n",
 227                                   walk_state));
 228                 return (AE_NOT_EXIST);
 229         }
 230
 231         if (!state->results.num_results) {
 232                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 233                                   "No result objects! State=%p\n", walk_state));
 234                 return (AE_AML_NO_RETURN_VALUE);
 235         }
 236
 237         /* Remove Bottom element */
 238
 239         *object = state->results.obj_desc[0];
 240
 241         /* Push entire stack down one element */
 242
 243         for (index = 0; index < state->results.num_results; index++) {
 244                 state->results.obj_desc[index] =
 245                     state->results.obj_desc[index + 1];
 246         }
 247
 248         state->results.num_results--;
 249
 250         /* Check for a valid result object */
 251
 252         if (!*object) {
 253                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 254                                   "Null operand! State=%p #Ops=%X Index=%X\n",
 255                                   walk_state, state->results.num_results,
 256                                   (u32) index));
 257                 return (AE_AML_NO_RETURN_VALUE);
 258         }
 259
 260         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] Results=%p State=%p\n",
 261                           *object,
 262                           (*object) ? acpi_ut_get_object_type_name(*object) :
 263                           "NULL", state, walk_state));
 264
 265         return (AE_OK);
 266 }
 267
 268 /*******************************************************************************
 269  *
 270  * FUNCTION:    acpi_ds_result_push
 271  *
 272  * PARAMETERS:  Object              - Where to return the popped object
 273  *              walk_state          - Current Walk state
 274  *
 275  * RETURN:      Status
 276  *
 277  * DESCRIPTION: Push an object onto the current result stack
 278  *
 279  ******************************************************************************/
 280
 281 acpi_status
 282 acpi_ds_result_push(union acpi_operand_object * object,
 283                     struct acpi_walk_state * walk_state)
 284 {
 285         union acpi_generic_state *state;
 286
 287         ACPI_FUNCTION_NAME("ds_result_push");
 288
 289         state = walk_state->results;
 290         if (!state) {
 291                 ACPI_REPORT_ERROR(("No result stack frame during push\n"));
 292                 return (AE_AML_INTERNAL);
 293         }
 294
 295         if (state->results.num_results == ACPI_OBJ_NUM_OPERANDS) {
 296                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 297                                   "Result stack overflow: Obj=%p State=%p Num=%X\n",
 298                                   object, walk_state,
 299                                   state->results.num_results));
 300                 return (AE_STACK_OVERFLOW);
 301         }
 302
 303         if (!object) {
 304                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 305                                   "Null Object! Obj=%p State=%p Num=%X\n",
 306                                   object, walk_state,
 307                                   state->results.num_results));
 308                 return (AE_BAD_PARAMETER);
 309         }
 310
 311         state->results.obj_desc[state->results.num_results] = object;
 312         state->results.num_results++;
 313
 314         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
 315                           object,
 316                           object ?
 317                           acpi_ut_get_object_type_name((union
 318                                                         acpi_operand_object *)
 319                                                        object) : "NULL",
 320                           walk_state, state->results.num_results,
 321                           walk_state->current_result));
 322
 323         return (AE_OK);
 324 }
 325
 326 /*******************************************************************************
 327  *
 328  * FUNCTION:    acpi_ds_result_stack_push
 329  *
 330  * PARAMETERS:  walk_state          - Current Walk state
 331  *
 332  * RETURN:      Status
 333  *
 334  * DESCRIPTION: Push an object onto the walk_state result stack.
 335  *
 336  ******************************************************************************/
 337
 338 acpi_status acpi_ds_result_stack_push(struct acpi_walk_state * walk_state)
 339 {
 340         union acpi_generic_state *state;
 341
 342         ACPI_FUNCTION_NAME("ds_result_stack_push");
 343
 344         state = acpi_ut_create_generic_state();
 345         if (!state) {
 346                 return (AE_NO_MEMORY);
 347         }
 348
 349         state->common.data_type = ACPI_DESC_TYPE_STATE_RESULT;
 350         acpi_ut_push_generic_state(&walk_state->results, state);
 351
 352         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n",
 353                           state, walk_state));
 354
 355         return (AE_OK);
 356 }
 357
 358 /*******************************************************************************
 359  *
 360  * FUNCTION:    acpi_ds_result_stack_pop
 361  *
 362  * PARAMETERS:  walk_state          - Current Walk state
 363  *
 364  * RETURN:      Status
 365  *
 366  * DESCRIPTION: Pop an object off of the walk_state result stack.
 367  *
 368  ******************************************************************************/
 369
 370 acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state * walk_state)
 371 {
 372         union acpi_generic_state *state;
 373
 374         ACPI_FUNCTION_NAME("ds_result_stack_pop");
 375
 376         /* Check for stack underflow */
 377
 378         if (walk_state->results == NULL) {
 379                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Underflow - State=%p\n",
 380                                   walk_state));
 381                 return (AE_AML_NO_OPERAND);
 382         }
 383
 384         state = acpi_ut_pop_generic_state(&walk_state->results);
 385
 386         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 387                           "Result=%p remaining_results=%X State=%p\n",
 388                           state, state->results.num_results, walk_state));
 389
 390         acpi_ut_delete_generic_state(state);
 391
 392         return (AE_OK);
 393 }
 394
 395 /*******************************************************************************
 396  *
 397  * FUNCTION:    acpi_ds_obj_stack_push
 398  *
 399  * PARAMETERS:  Object              - Object to push
 400  *              walk_state          - Current Walk state
 401  *
 402  * RETURN:      Status
 403  *
 404  * DESCRIPTION: Push an object onto this walk's object/operand stack
 405  *
 406  ******************************************************************************/
 407
 408 acpi_status
 409 acpi_ds_obj_stack_push(void *object, struct acpi_walk_state * walk_state)
 410 {
 411         ACPI_FUNCTION_NAME("ds_obj_stack_push");
 412
 413         /* Check for stack overflow */
 414
 415         if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) {
 416                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 417                                   "overflow! Obj=%p State=%p #Ops=%X\n",
 418                                   object, walk_state,
 419                                   walk_state->num_operands));
 420                 return (AE_STACK_OVERFLOW);
 421         }
 422
 423         /* Put the object onto the stack */
 424
 425         walk_state->operands[walk_state->num_operands] = object;
 426         walk_state->num_operands++;
 427
 428         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
 429                           object,
 430                           acpi_ut_get_object_type_name((union
 431                                                         acpi_operand_object *)
 432                                                        object), walk_state,
 433                           walk_state->num_operands));
 434
 435         return (AE_OK);
 436 }
 437
 438 /*******************************************************************************
 439  *
 440  * FUNCTION:    acpi_ds_obj_stack_pop
 441  *
 442  * PARAMETERS:  pop_count           - Number of objects/entries to pop
 443  *              walk_state          - Current Walk state
 444  *
 445  * RETURN:      Status
 446  *
 447  * DESCRIPTION: Pop this walk's object stack.  Objects on the stack are NOT
 448  *              deleted by this routine.
 449  *
 450  ******************************************************************************/
 451
 452 acpi_status
 453 acpi_ds_obj_stack_pop(u32 pop_count, struct acpi_walk_state * walk_state)
 454 {
 455         u32 i;
 456
 457         ACPI_FUNCTION_NAME("ds_obj_stack_pop");
 458
 459         for (i = 0; i < pop_count; i++) {
 460                 /* Check for stack underflow */
 461
 462                 if (walk_state->num_operands == 0) {
 463                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 464                                           "Underflow! Count=%X State=%p #Ops=%X\n",
 465                                           pop_count, walk_state,
 466                                           walk_state->num_operands));
 467                         return (AE_STACK_UNDERFLOW);
 468                 }
 469
 470                 /* Just set the stack entry to null */
 471
 472                 walk_state->num_operands--;
 473                 walk_state->operands[walk_state->num_operands] = NULL;
 474         }
 475
 476         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
 477                           pop_count, walk_state, walk_state->num_operands));
 478
 479         return (AE_OK);
 480 }
 481
 482 /*******************************************************************************
 483  *
 484  * FUNCTION:    acpi_ds_obj_stack_pop_and_delete
 485  *
 486  * PARAMETERS:  pop_count           - Number of objects/entries to pop
 487  *              walk_state          - Current Walk state
 488  *
 489  * RETURN:      Status
 490  *
 491  * DESCRIPTION: Pop this walk's object stack and delete each object that is
 492  *              popped off.
 493  *
 494  ******************************************************************************/
 495
 496 acpi_status
 497 acpi_ds_obj_stack_pop_and_delete(u32 pop_count,
 498                                  struct acpi_walk_state * walk_state)
 499 {
 500         u32 i;
 501         union acpi_operand_object *obj_desc;
 502
 503         ACPI_FUNCTION_NAME("ds_obj_stack_pop_and_delete");
 504
 505         for (i = 0; i < pop_count; i++) {
 506                 /* Check for stack underflow */
 507
 508                 if (walk_state->num_operands == 0) {
 509                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 510                                           "Underflow! Count=%X State=%p #Ops=%X\n",
 511                                           pop_count, walk_state,
 512                                           walk_state->num_operands));
 513                         return (AE_STACK_UNDERFLOW);
 514                 }
 515
 516                 /* Pop the stack and delete an object if present in this stack entry */
 517
 518                 walk_state->num_operands--;
 519                 obj_desc = walk_state->operands[walk_state->num_operands];
 520                 if (obj_desc) {
 521                         acpi_ut_remove_reference(walk_state->
 522                                                  operands[walk_state->
 523                                                           num_operands]);
 524                         walk_state->operands[walk_state->num_operands] = NULL;
 525                 }
 526         }
 527
 528         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
 529                           pop_count, walk_state, walk_state->num_operands));
 530
 531         return (AE_OK);
 532 }
 533
 534 /*******************************************************************************
 535  *
 536  * FUNCTION:    acpi_ds_get_current_walk_state
 537  *
 538  * PARAMETERS:  Thread          - Get current active state for this Thread
 539  *
 540  * RETURN:      Pointer to the current walk state
 541  *
 542  * DESCRIPTION: Get the walk state that is at the head of the list (the "current"
 543  *              walk state.)
 544  *
 545  ******************************************************************************/
 546
 547 struct acpi_walk_state *acpi_ds_get_current_walk_state(struct acpi_thread_state
 548                                                        *thread)
 549 {
 550         ACPI_FUNCTION_NAME("ds_get_current_walk_state");
 551
 552         if (!thread) {
 553                 return (NULL);
 554         }
 555
 556         ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Current walk_state %p\n",
 557                           thread->walk_state_list));
 558
 559         return (thread->walk_state_list);
 560 }
 561
 562 /*******************************************************************************
 563  *
 564  * FUNCTION:    acpi_ds_push_walk_state
 565  *
 566  * PARAMETERS:  walk_state      - State to push
 567  *              Thread          - Thread state object
 568  *
 569  * RETURN:      None
 570  *
 571  * DESCRIPTION: Place the Thread state at the head of the state list.
 572  *
 573  ******************************************************************************/
 574
 575 void
 576 acpi_ds_push_walk_state(struct acpi_walk_state *walk_state,
 577                         struct acpi_thread_state *thread)
 578 {
 579         ACPI_FUNCTION_TRACE("ds_push_walk_state");
 580
 581         walk_state->next = thread->walk_state_list;
 582         thread->walk_state_list = walk_state;
 583
 584         return_VOID;
 585 }
 586
 587 /*******************************************************************************
 588  *
 589  * FUNCTION:    acpi_ds_pop_walk_state
 590  *
 591  * PARAMETERS:  Thread      - Current thread state
 592  *
 593  * RETURN:      A walk_state object popped from the thread's stack
 594  *
 595  * DESCRIPTION: Remove and return the walkstate object that is at the head of
 596  *              the walk stack for the given walk list.  NULL indicates that
 597  *              the list is empty.
 598  *
 599  ******************************************************************************/
 600
 601 struct acpi_walk_state *acpi_ds_pop_walk_state(struct acpi_thread_state *thread)
 602 {
 603         struct acpi_walk_state *walk_state;
 604
 605         ACPI_FUNCTION_TRACE("ds_pop_walk_state");
 606
 607         walk_state = thread->walk_state_list;
 608
 609         if (walk_state) {
 610                 /* Next walk state becomes the current walk state */
 611
 612                 thread->walk_state_list = walk_state->next;
 613
 614                 /*
 615                  * Don't clear the NEXT field, this serves as an indicator
 616                  * that there is a parent WALK STATE
 617                  * Do Not: walk_state->Next = NULL;
 618                  */
 619         }
 620
 621         return_PTR(walk_state);
 622 }
 623
 624 /*******************************************************************************
 625  *
 626  * FUNCTION:    acpi_ds_create_walk_state
 627  *
 628  * PARAMETERS:  owner_id        - ID for object creation
 629  *              Origin          - Starting point for this walk
 630  *              mth_desc        - Method object
 631  *              Thread          - Current thread state
 632  *
 633  * RETURN:      Pointer to the new walk state.
 634  *
 635  * DESCRIPTION: Allocate and initialize a new walk state.  The current walk
 636  *              state is set to this new state.
 637  *
 638  ******************************************************************************/
 639
 640 struct acpi_walk_state *acpi_ds_create_walk_state(acpi_owner_id owner_id,
 641                                                   union acpi_parse_object
 642                                                   *origin,
 643                                                   union acpi_operand_object
 644                                                   *mth_desc,
 645                                                   struct acpi_thread_state
 646                                                   *thread)
 647 {
 648         struct acpi_walk_state *walk_state;
 649         acpi_status status;
 650
 651         ACPI_FUNCTION_TRACE("ds_create_walk_state");
 652
 653         walk_state = ACPI_MEM_CALLOCATE(sizeof(struct acpi_walk_state));
 654         if (!walk_state) {
 655                 return_PTR(NULL);
 656         }
 657
 658         walk_state->data_type = ACPI_DESC_TYPE_WALK;
 659         walk_state->owner_id = owner_id;
 660         walk_state->origin = origin;
 661         walk_state->method_desc = mth_desc;
 662         walk_state->thread = thread;
 663
 664         walk_state->parser_state.start_op = origin;
 665
 666         /* Init the method args/local */
 667
 668 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
 669         acpi_ds_method_data_init(walk_state);
 670 #endif
 671
 672         /* Create an initial result stack entry */
 673
 674         status = acpi_ds_result_stack_push(walk_state);
 675         if (ACPI_FAILURE(status)) {
 676                 ACPI_MEM_FREE(walk_state);
 677                 return_PTR(NULL);
 678         }
 679
 680         /* Put the new state at the head of the walk list */
 681
 682         if (thread) {
 683                 acpi_ds_push_walk_state(walk_state, thread);
 684         }
 685
 686         return_PTR(walk_state);
 687 }
 688
 689 /*******************************************************************************
 690  *
 691  * FUNCTION:    acpi_ds_init_aml_walk
 692  *
 693  * PARAMETERS:  walk_state      - New state to be initialized
 694  *              Op              - Current parse op
 695  *              method_node     - Control method NS node, if any
 696  *              aml_start       - Start of AML
 697  *              aml_length      - Length of AML
 698  *              Info            - Method info block (params, etc.)
 699  *              pass_number     - 1, 2, or 3
 700  *
 701  * RETURN:      Status
 702  *
 703  * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
 704  *
 705  ******************************************************************************/
 706
 707 acpi_status
 708 acpi_ds_init_aml_walk(struct acpi_walk_state *walk_state,
 709                       union acpi_parse_object *op,
 710                       struct acpi_namespace_node *method_node,
 711                       u8 * aml_start,
 712                       u32 aml_length,
 713                       struct acpi_parameter_info *info, u8 pass_number)
 714 {
 715         acpi_status status;
 716         struct acpi_parse_state *parser_state = &walk_state->parser_state;
 717         union acpi_parse_object *extra_op;
 718
 719         ACPI_FUNCTION_TRACE("ds_init_aml_walk");
 720
 721         walk_state->parser_state.aml =
 722             walk_state->parser_state.aml_start = aml_start;
 723         walk_state->parser_state.aml_end =
 724             walk_state->parser_state.pkg_end = aml_start + aml_length;
 725
 726         /* The next_op of the next_walk will be the beginning of the method */
 727
 728         walk_state->next_op = NULL;
 729         walk_state->pass_number = pass_number;
 730
 731         if (info) {
 732                 if (info->parameter_type == ACPI_PARAM_GPE) {
 733                         walk_state->gpe_event_info =
 734                             ACPI_CAST_PTR(struct acpi_gpe_event_info,
 735                                           info->parameters);
 736                 } else {
 737                         walk_state->params = info->parameters;
 738                         walk_state->caller_return_desc = &info->return_object;
 739                 }
 740         }
 741
 742         status = acpi_ps_init_scope(&walk_state->parser_state, op);
 743         if (ACPI_FAILURE(status)) {
 744                 return_ACPI_STATUS(status);
 745         }
 746
 747         if (method_node) {
 748                 walk_state->parser_state.start_node = method_node;
 749                 walk_state->walk_type = ACPI_WALK_METHOD;
 750                 walk_state->method_node = method_node;
 751                 walk_state->method_desc =
 752                     acpi_ns_get_attached_object(method_node);
 753
 754                 /* Push start scope on scope stack and make it current  */
 755
 756                 status =
 757                     acpi_ds_scope_stack_push(method_node, ACPI_TYPE_METHOD,
 758                                              walk_state);
 759                 if (ACPI_FAILURE(status)) {
 760                         return_ACPI_STATUS(status);
 761                 }
 762
 763                 /* Init the method arguments */
 764
 765                 status = acpi_ds_method_data_init_args(walk_state->params,
 766                                                        ACPI_METHOD_NUM_ARGS,
 767                                                        walk_state);
 768                 if (ACPI_FAILURE(status)) {
 769                         return_ACPI_STATUS(status);
 770                 }
 771         } else {
 772                 /*
 773                  * Setup the current scope.
 774                  * Find a Named Op that has a namespace node associated with it.
 775                  * search upwards from this Op.  Current scope is the first
 776                  * Op with a namespace node.
 777                  */
 778                 extra_op = parser_state->start_op;
 779                 while (extra_op && !extra_op->common.node) {
 780                         extra_op = extra_op->common.parent;
 781                 }
 782
 783                 if (!extra_op) {
 784                         parser_state->start_node = NULL;
 785                 } else {
 786                         parser_state->start_node = extra_op->common.node;
 787                 }
 788
 789                 if (parser_state->start_node) {
 790                         /* Push start scope on scope stack and make it current  */
 791
 792                         status =
 793                             acpi_ds_scope_stack_push(parser_state->start_node,
 794                                                      parser_state->start_node->
 795                                                      type, walk_state);
 796                         if (ACPI_FAILURE(status)) {
 797                                 return_ACPI_STATUS(status);
 798                         }
 799                 }
 800         }
 801
 802         status = acpi_ds_init_callbacks(walk_state, pass_number);
 803         return_ACPI_STATUS(status);
 804 }
 805
 806 /*******************************************************************************
 807  *
 808  * FUNCTION:    acpi_ds_delete_walk_state
 809  *
 810  * PARAMETERS:  walk_state      - State to delete
 811  *
 812  * RETURN:      Status
 813  *
 814  * DESCRIPTION: Delete a walk state including all internal data structures
 815  *
 816  ******************************************************************************/
 817
 818 void acpi_ds_delete_walk_state(struct acpi_walk_state *walk_state)
 819 {
 820         union acpi_generic_state *state;
 821
 822         ACPI_FUNCTION_TRACE_PTR("ds_delete_walk_state", walk_state);
 823
 824         if (!walk_state) {
 825                 return;
 826         }
 827
 828         if (walk_state->data_type != ACPI_DESC_TYPE_WALK) {
 829                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 830                                   "%p is not a valid walk state\n",
 831                                   walk_state));
 832                 return;
 833         }
 834
 835         if (walk_state->parser_state.scope) {
 836                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 837                                   "%p walk still has a scope list\n",
 838                                   walk_state));
 839         }
 840
 841         /* Always must free any linked control states */
 842
 843         while (walk_state->control_state) {
 844                 state = walk_state->control_state;
 845                 walk_state->control_state = state->common.next;
 846
 847                 acpi_ut_delete_generic_state(state);
 848         }
 849
 850         /* Always must free any linked parse states */
 851
 852         while (walk_state->scope_info) {
 853                 state = walk_state->scope_info;
 854                 walk_state->scope_info = state->common.next;
 855
 856                 acpi_ut_delete_generic_state(state);
 857         }
 858
 859         /* Always must free any stacked result states */
 860
 861         while (walk_state->results) {
 862                 state = walk_state->results;
 863                 walk_state->results = state->common.next;
 864
 865                 acpi_ut_delete_generic_state(state);
 866         }
 867
 868         ACPI_MEM_FREE(walk_state);
 869         return_VOID;
 870 }
 871
 872 #ifdef ACPI_OBSOLETE_FUNCTIONS
 873 /*******************************************************************************
 874  *
 875  * FUNCTION:    acpi_ds_result_insert
 876  *
 877  * PARAMETERS:  Object              - Object to push
 878  *              Index               - Where to insert the object
 879  *              walk_state          - Current Walk state
 880  *
 881  * RETURN:      Status
 882  *
 883  * DESCRIPTION: Insert an object onto this walk's result stack
 884  *
 885  ******************************************************************************/
 886
 887 acpi_status
 888 acpi_ds_result_insert(void *object,
 889                       u32 index, struct acpi_walk_state *walk_state)
 890 {
 891         union acpi_generic_state *state;
 892
 893         ACPI_FUNCTION_NAME("ds_result_insert");
 894
 895         state = walk_state->results;
 896         if (!state) {
 897                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 898                                   "No result object pushed! State=%p\n",
 899                                   walk_state));
 900                 return (AE_NOT_EXIST);
 901         }
 902
 903         if (index >= ACPI_OBJ_NUM_OPERANDS) {
 904                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 905                                   "Index out of range: %X Obj=%p State=%p Num=%X\n",
 906                                   index, object, walk_state,
 907                                   state->results.num_results));
 908                 return (AE_BAD_PARAMETER);
 909         }
 910
 911         if (!object) {
 912                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 913                                   "Null Object! Index=%X Obj=%p State=%p Num=%X\n",
 914                                   index, object, walk_state,
 915                                   state->results.num_results));
 916                 return (AE_BAD_PARAMETER);
 917         }
 918
 919         state->results.obj_desc[index] = object;
 920         state->results.num_results++;
 921
 922         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 923                           "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
 924                           object,
 925                           object ?
 926                           acpi_ut_get_object_type_name((union
 927                                                         acpi_operand_object *)
 928                                                        object) : "NULL",
 929                           walk_state, state->results.num_results,
 930                           walk_state->current_result));
 931
 932         return (AE_OK);
 933 }
 934
 935 /*******************************************************************************
 936  *
 937  * FUNCTION:    acpi_ds_obj_stack_delete_all
 938  *
 939  * PARAMETERS:  walk_state          - Current Walk state
 940  *
 941  * RETURN:      Status
 942  *
 943  * DESCRIPTION: Clear the object stack by deleting all objects that are on it.
 944  *              Should be used with great care, if at all!
 945  *
 946  ******************************************************************************/
 947
 948 acpi_status acpi_ds_obj_stack_delete_all(struct acpi_walk_state * walk_state)
 949 {
 950         u32 i;
 951
 952         ACPI_FUNCTION_TRACE_PTR("ds_obj_stack_delete_all", walk_state);
 953
 954         /* The stack size is configurable, but fixed */
 955
 956         for (i = 0; i < ACPI_OBJ_NUM_OPERANDS; i++) {
 957                 if (walk_state->operands[i]) {
 958                         acpi_ut_remove_reference(walk_state->operands[i]);
 959                         walk_state->operands[i] = NULL;
 960                 }
 961         }
 962
 963         return_ACPI_STATUS(AE_OK);
 964 }
 965
 966 /*******************************************************************************
 967  *
 968  * FUNCTION:    acpi_ds_obj_stack_pop_object
 969  *
 970  * PARAMETERS:  Object              - Where to return the popped object
 971  *              walk_state          - Current Walk state
 972  *
 973  * RETURN:      Status
 974  *
 975  * DESCRIPTION: Pop this walk's object stack.  Objects on the stack are NOT
 976  *              deleted by this routine.
 977  *
 978  ******************************************************************************/
 979
 980 acpi_status
 981 acpi_ds_obj_stack_pop_object(union acpi_operand_object **object,
 982                              struct acpi_walk_state *walk_state)
 983 {
 984         ACPI_FUNCTION_NAME("ds_obj_stack_pop_object");
 985
 986         /* Check for stack underflow */
 987
 988         if (walk_state->num_operands == 0) {
 989                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 990                                   "Missing operand/stack empty! State=%p #Ops=%X\n",
 991                                   walk_state, walk_state->num_operands));
 992                 *object = NULL;
 993                 return (AE_AML_NO_OPERAND);
 994         }
 995
 996         /* Pop the stack */
 997
 998         walk_state->num_operands--;
 999
1000         /* Check for a valid operand */
1001
1002         if (!walk_state->operands[walk_state->num_operands]) {
1003                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1004                                   "Null operand! State=%p #Ops=%X\n",
1005                                   walk_state, walk_state->num_operands));
1006                 *object = NULL;
1007                 return (AE_AML_NO_OPERAND);
1008         }
1009
1010         /* Get operand and set stack entry to null */
1011
1012         *object = walk_state->operands[walk_state->num_operands];
1013         walk_state->operands[walk_state->num_operands] = NULL;
1014
1015         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
1016                           *object, acpi_ut_get_object_type_name(*object),
1017                           walk_state, walk_state->num_operands));
1018
1019         return (AE_OK);
1020 }
1021
1022 /*******************************************************************************
1023  *
1024  * FUNCTION:    acpi_ds_obj_stack_get_value
1025  *
1026  * PARAMETERS:  Index               - Stack index whose value is desired.  Based
1027  *                                    on the top of the stack (index=0 == top)
1028  *              walk_state          - Current Walk state
1029  *
1030  * RETURN:      Pointer to the requested operand
1031  *
1032  * DESCRIPTION: Retrieve an object from this walk's operand stack.  Index must
1033  *              be within the range of the current stack pointer.
1034  *
1035  ******************************************************************************/
1036
1037 void *acpi_ds_obj_stack_get_value(u32 index, struct acpi_walk_state *walk_state)
1038 {
1039
1040         ACPI_FUNCTION_TRACE_PTR("ds_obj_stack_get_value", walk_state);
1041
1042         /* Can't do it if the stack is empty */
1043
1044         if (walk_state->num_operands == 0) {
1045                 return_PTR(NULL);
1046         }
1047
1048         /* or if the index is past the top of the stack */
1049
1050         if (index > (walk_state->num_operands - (u32) 1)) {
1051                 return_PTR(NULL);
1052         }
1053
1054         return_PTR(walk_state->
1055                    operands[(acpi_native_uint) (walk_state->num_operands - 1) -
1056                             index]);
1057 }
1058 #endif