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 - 2006, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #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_ERROR((AE_INFO, "No result object pushed! State=%p",
  96                             walk_state));
  97                 return (AE_NOT_EXIST);
  98         }
  99
 100         if (index >= ACPI_OBJ_MAX_OPERAND) {
 101                 ACPI_ERROR((AE_INFO,
 102                             "Index out of range: %X State=%p Num=%X",
 103                             index, walk_state, state->results.num_results));
 104         }
 105
 106         /* Check for a valid result object */
 107
 108         if (!state->results.obj_desc[index]) {
 109                 ACPI_ERROR((AE_INFO,
 110                             "Null operand! State=%p #Ops=%X, Index=%X",
 111                             walk_state, state->results.num_results, index));
 112                 return (AE_AML_NO_RETURN_VALUE);
 113         }
 114
 115         /* Remove the object */
 116
 117         state->results.num_results--;
 118
 119         *object = state->results.obj_desc[index];
 120         state->results.obj_desc[index] = NULL;
 121
 122         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 123                           "Obj=%p [%s] Index=%X State=%p Num=%X\n",
 124                           *object,
 125                           (*object) ? acpi_ut_get_object_type_name(*object) :
 126                           "NULL", index, walk_state,
 127                           state->results.num_results));
 128
 129         return (AE_OK);
 130 }
 131
 132 #endif                          /*  ACPI_FUTURE_USAGE  */
 133
 134 /*******************************************************************************
 135  *
 136  * FUNCTION:    acpi_ds_result_pop
 137  *
 138  * PARAMETERS:  Object              - Where to return the popped object
 139  *              walk_state          - Current Walk state
 140  *
 141  * RETURN:      Status
 142  *
 143  * DESCRIPTION: Pop an object off the bottom of this walk's result stack.  In
 144  *              other words, this is a FIFO.
 145  *
 146  ******************************************************************************/
 147
 148 acpi_status
 149 acpi_ds_result_pop(union acpi_operand_object ** object,
 150                    struct acpi_walk_state * walk_state)
 151 {
 152         acpi_native_uint index;
 153         union acpi_generic_state *state;
 154
 155         ACPI_FUNCTION_NAME("ds_result_pop");
 156
 157         state = walk_state->results;
 158         if (!state) {
 159                 return (AE_OK);
 160         }
 161
 162         if (!state->results.num_results) {
 163                 ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p",
 164                             walk_state));
 165                 return (AE_AML_NO_RETURN_VALUE);
 166         }
 167
 168         /* Remove top element */
 169
 170         state->results.num_results--;
 171
 172         for (index = ACPI_OBJ_NUM_OPERANDS; index; index--) {
 173                 /* Check for a valid result object */
 174
 175                 if (state->results.obj_desc[index - 1]) {
 176                         *object = state->results.obj_desc[index - 1];
 177                         state->results.obj_desc[index - 1] = NULL;
 178
 179                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 180                                           "Obj=%p [%s] Index=%X State=%p Num=%X\n",
 181                                           *object,
 182                                           (*object) ?
 183                                           acpi_ut_get_object_type_name(*object)
 184                                           : "NULL", (u32) index - 1, walk_state,
 185                                           state->results.num_results));
 186
 187                         return (AE_OK);
 188                 }
 189         }
 190
 191         ACPI_ERROR((AE_INFO, "No result objects! State=%p", walk_state));
 192         return (AE_AML_NO_RETURN_VALUE);
 193 }
 194
 195 /*******************************************************************************
 196  *
 197  * FUNCTION:    acpi_ds_result_pop_from_bottom
 198  *
 199  * PARAMETERS:  Object              - Where to return the popped object
 200  *              walk_state          - Current Walk state
 201  *
 202  * RETURN:      Status
 203  *
 204  * DESCRIPTION: Pop an object off the bottom of this walk's result stack.  In
 205  *              other words, this is a FIFO.
 206  *
 207  ******************************************************************************/
 208
 209 acpi_status
 210 acpi_ds_result_pop_from_bottom(union acpi_operand_object ** object,
 211                                struct acpi_walk_state * walk_state)
 212 {
 213         acpi_native_uint index;
 214         union acpi_generic_state *state;
 215
 216         ACPI_FUNCTION_NAME("ds_result_pop_from_bottom");
 217
 218         state = walk_state->results;
 219         if (!state) {
 220                 ACPI_ERROR((AE_INFO,
 221                             "No result object pushed! State=%p", walk_state));
 222                 return (AE_NOT_EXIST);
 223         }
 224
 225         if (!state->results.num_results) {
 226                 ACPI_ERROR((AE_INFO, "No result objects! State=%p",
 227                             walk_state));
 228                 return (AE_AML_NO_RETURN_VALUE);
 229         }
 230
 231         /* Remove Bottom element */
 232
 233         *object = state->results.obj_desc[0];
 234
 235         /* Push entire stack down one element */
 236
 237         for (index = 0; index < state->results.num_results; index++) {
 238                 state->results.obj_desc[index] =
 239                     state->results.obj_desc[index + 1];
 240         }
 241
 242         state->results.num_results--;
 243
 244         /* Check for a valid result object */
 245
 246         if (!*object) {
 247                 ACPI_ERROR((AE_INFO,
 248                             "Null operand! State=%p #Ops=%X Index=%X",
 249                             walk_state, state->results.num_results,
 250                             (u32) index));
 251                 return (AE_AML_NO_RETURN_VALUE);
 252         }
 253
 254         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] Results=%p State=%p\n",
 255                           *object,
 256                           (*object) ? acpi_ut_get_object_type_name(*object) :
 257                           "NULL", state, walk_state));
 258
 259         return (AE_OK);
 260 }
 261
 262 /*******************************************************************************
 263  *
 264  * FUNCTION:    acpi_ds_result_push
 265  *
 266  * PARAMETERS:  Object              - Where to return the popped object
 267  *              walk_state          - Current Walk state
 268  *
 269  * RETURN:      Status
 270  *
 271  * DESCRIPTION: Push an object onto the current result stack
 272  *
 273  ******************************************************************************/
 274
 275 acpi_status
 276 acpi_ds_result_push(union acpi_operand_object * object,
 277                     struct acpi_walk_state * walk_state)
 278 {
 279         union acpi_generic_state *state;
 280
 281         ACPI_FUNCTION_NAME("ds_result_push");
 282
 283         state = walk_state->results;
 284         if (!state) {
 285                 ACPI_ERROR((AE_INFO, "No result stack frame during push"));
 286                 return (AE_AML_INTERNAL);
 287         }
 288
 289         if (state->results.num_results == ACPI_OBJ_NUM_OPERANDS) {
 290                 ACPI_ERROR((AE_INFO,
 291                             "Result stack overflow: Obj=%p State=%p Num=%X",
 292                             object, walk_state, state->results.num_results));
 293                 return (AE_STACK_OVERFLOW);
 294         }
 295
 296         if (!object) {
 297                 ACPI_ERROR((AE_INFO,
 298                             "Null Object! Obj=%p State=%p Num=%X",
 299                             object, walk_state, state->results.num_results));
 300                 return (AE_BAD_PARAMETER);
 301         }
 302
 303         state->results.obj_desc[state->results.num_results] = object;
 304         state->results.num_results++;
 305
 306         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
 307                           object,
 308                           object ?
 309                           acpi_ut_get_object_type_name((union
 310                                                         acpi_operand_object *)
 311                                                        object) : "NULL",
 312                           walk_state, state->results.num_results,
 313                           walk_state->current_result));
 314
 315         return (AE_OK);
 316 }
 317
 318 /*******************************************************************************
 319  *
 320  * FUNCTION:    acpi_ds_result_stack_push
 321  *
 322  * PARAMETERS:  walk_state          - Current Walk state
 323  *
 324  * RETURN:      Status
 325  *
 326  * DESCRIPTION: Push an object onto the walk_state result stack.
 327  *
 328  ******************************************************************************/
 329
 330 acpi_status acpi_ds_result_stack_push(struct acpi_walk_state * walk_state)
 331 {
 332         union acpi_generic_state *state;
 333
 334         ACPI_FUNCTION_NAME("ds_result_stack_push");
 335
 336         state = acpi_ut_create_generic_state();
 337         if (!state) {
 338                 return (AE_NO_MEMORY);
 339         }
 340
 341         state->common.data_type = ACPI_DESC_TYPE_STATE_RESULT;
 342         acpi_ut_push_generic_state(&walk_state->results, state);
 343
 344         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n",
 345                           state, walk_state));
 346
 347         return (AE_OK);
 348 }
 349
 350 /*******************************************************************************
 351  *
 352  * FUNCTION:    acpi_ds_result_stack_pop
 353  *
 354  * PARAMETERS:  walk_state          - Current Walk state
 355  *
 356  * RETURN:      Status
 357  *
 358  * DESCRIPTION: Pop an object off of the walk_state result stack.
 359  *
 360  ******************************************************************************/
 361
 362 acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state * walk_state)
 363 {
 364         union acpi_generic_state *state;
 365
 366         ACPI_FUNCTION_NAME("ds_result_stack_pop");
 367
 368         /* Check for stack underflow */
 369
 370         if (walk_state->results == NULL) {
 371                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Underflow - State=%p\n",
 372                                   walk_state));
 373                 return (AE_AML_NO_OPERAND);
 374         }
 375
 376         state = acpi_ut_pop_generic_state(&walk_state->results);
 377
 378         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 379                           "Result=%p remaining_results=%X State=%p\n",
 380                           state, state->results.num_results, walk_state));
 381
 382         acpi_ut_delete_generic_state(state);
 383
 384         return (AE_OK);
 385 }
 386
 387 /*******************************************************************************
 388  *
 389  * FUNCTION:    acpi_ds_obj_stack_push
 390  *
 391  * PARAMETERS:  Object              - Object to push
 392  *              walk_state          - Current Walk state
 393  *
 394  * RETURN:      Status
 395  *
 396  * DESCRIPTION: Push an object onto this walk's object/operand stack
 397  *
 398  ******************************************************************************/
 399
 400 acpi_status
 401 acpi_ds_obj_stack_push(void *object, struct acpi_walk_state * walk_state)
 402 {
 403         ACPI_FUNCTION_NAME("ds_obj_stack_push");
 404
 405         /* Check for stack overflow */
 406
 407         if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) {
 408                 ACPI_ERROR((AE_INFO,
 409                             "Object stack overflow! Obj=%p State=%p #Ops=%X",
 410                             object, walk_state, walk_state->num_operands));
 411                 return (AE_STACK_OVERFLOW);
 412         }
 413
 414         /* Put the object onto the stack */
 415
 416         walk_state->operands[walk_state->num_operands] = object;
 417         walk_state->num_operands++;
 418
 419         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
 420                           object,
 421                           acpi_ut_get_object_type_name((union
 422                                                         acpi_operand_object *)
 423                                                        object), walk_state,
 424                           walk_state->num_operands));
 425
 426         return (AE_OK);
 427 }
 428
 429 /*******************************************************************************
 430  *
 431  * FUNCTION:    acpi_ds_obj_stack_pop
 432  *
 433  * PARAMETERS:  pop_count           - Number of objects/entries to pop
 434  *              walk_state          - Current Walk state
 435  *
 436  * RETURN:      Status
 437  *
 438  * DESCRIPTION: Pop this walk's object stack.  Objects on the stack are NOT
 439  *              deleted by this routine.
 440  *
 441  ******************************************************************************/
 442
 443 acpi_status
 444 acpi_ds_obj_stack_pop(u32 pop_count, struct acpi_walk_state * walk_state)
 445 {
 446         u32 i;
 447
 448         ACPI_FUNCTION_NAME("ds_obj_stack_pop");
 449
 450         for (i = 0; i < pop_count; i++) {
 451                 /* Check for stack underflow */
 452
 453                 if (walk_state->num_operands == 0) {
 454                         ACPI_ERROR((AE_INFO,
 455                                     "Object stack underflow! Count=%X State=%p #Ops=%X",
 456                                     pop_count, walk_state,
 457                                     walk_state->num_operands));
 458                         return (AE_STACK_UNDERFLOW);
 459                 }
 460
 461                 /* Just set the stack entry to null */
 462
 463                 walk_state->num_operands--;
 464                 walk_state->operands[walk_state->num_operands] = NULL;
 465         }
 466
 467         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
 468                           pop_count, walk_state, walk_state->num_operands));
 469
 470         return (AE_OK);
 471 }
 472
 473 /*******************************************************************************
 474  *
 475  * FUNCTION:    acpi_ds_obj_stack_pop_and_delete
 476  *
 477  * PARAMETERS:  pop_count           - Number of objects/entries to pop
 478  *              walk_state          - Current Walk state
 479  *
 480  * RETURN:      Status
 481  *
 482  * DESCRIPTION: Pop this walk's object stack and delete each object that is
 483  *              popped off.
 484  *
 485  ******************************************************************************/
 486
 487 acpi_status
 488 acpi_ds_obj_stack_pop_and_delete(u32 pop_count,
 489                                  struct acpi_walk_state * walk_state)
 490 {
 491         u32 i;
 492         union acpi_operand_object *obj_desc;
 493
 494         ACPI_FUNCTION_NAME("ds_obj_stack_pop_and_delete");
 495
 496         for (i = 0; i < pop_count; i++) {
 497                 /* Check for stack underflow */
 498
 499                 if (walk_state->num_operands == 0) {
 500                         ACPI_ERROR((AE_INFO,
 501                                     "Object stack underflow! Count=%X State=%p #Ops=%X",
 502                                     pop_count, walk_state,
 503                                     walk_state->num_operands));
 504                         return (AE_STACK_UNDERFLOW);
 505                 }
 506
 507                 /* Pop the stack and delete an object if present in this stack entry */
 508
 509                 walk_state->num_operands--;
 510                 obj_desc = walk_state->operands[walk_state->num_operands];
 511                 if (obj_desc) {
 512                         acpi_ut_remove_reference(walk_state->
 513                                                  operands[walk_state->
 514                                                           num_operands]);
 515                         walk_state->operands[walk_state->num_operands] = NULL;
 516                 }
 517         }
 518
 519         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
 520                           pop_count, walk_state, walk_state->num_operands));
 521
 522         return (AE_OK);
 523 }
 524
 525 /*******************************************************************************
 526  *
 527  * FUNCTION:    acpi_ds_get_current_walk_state
 528  *
 529  * PARAMETERS:  Thread          - Get current active state for this Thread
 530  *
 531  * RETURN:      Pointer to the current walk state
 532  *
 533  * DESCRIPTION: Get the walk state that is at the head of the list (the "current"
 534  *              walk state.)
 535  *
 536  ******************************************************************************/
 537
 538 struct acpi_walk_state *acpi_ds_get_current_walk_state(struct acpi_thread_state
 539                                                        *thread)
 540 {
 541         ACPI_FUNCTION_NAME("ds_get_current_walk_state");
 542
 543         if (!thread) {
 544                 return (NULL);
 545         }
 546
 547         ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Current walk_state %p\n",
 548                           thread->walk_state_list));
 549
 550         return (thread->walk_state_list);
 551 }
 552
 553 /*******************************************************************************
 554  *
 555  * FUNCTION:    acpi_ds_push_walk_state
 556  *
 557  * PARAMETERS:  walk_state      - State to push
 558  *              Thread          - Thread state object
 559  *
 560  * RETURN:      None
 561  *
 562  * DESCRIPTION: Place the Thread state at the head of the state list.
 563  *
 564  ******************************************************************************/
 565
 566 void
 567 acpi_ds_push_walk_state(struct acpi_walk_state *walk_state,
 568                         struct acpi_thread_state *thread)
 569 {
 570         ACPI_FUNCTION_TRACE("ds_push_walk_state");
 571
 572         walk_state->next = thread->walk_state_list;
 573         thread->walk_state_list = walk_state;
 574
 575         return_VOID;
 576 }
 577
 578 /*******************************************************************************
 579  *
 580  * FUNCTION:    acpi_ds_pop_walk_state
 581  *
 582  * PARAMETERS:  Thread      - Current thread state
 583  *
 584  * RETURN:      A walk_state object popped from the thread's stack
 585  *
 586  * DESCRIPTION: Remove and return the walkstate object that is at the head of
 587  *              the walk stack for the given walk list.  NULL indicates that
 588  *              the list is empty.
 589  *
 590  ******************************************************************************/
 591
 592 struct acpi_walk_state *acpi_ds_pop_walk_state(struct acpi_thread_state *thread)
 593 {
 594         struct acpi_walk_state *walk_state;
 595
 596         ACPI_FUNCTION_TRACE("ds_pop_walk_state");
 597
 598         walk_state = thread->walk_state_list;
 599
 600         if (walk_state) {
 601                 /* Next walk state becomes the current walk state */
 602
 603                 thread->walk_state_list = walk_state->next;
 604
 605                 /*
 606                  * Don't clear the NEXT field, this serves as an indicator
 607                  * that there is a parent WALK STATE
 608                  * Do Not: walk_state->Next = NULL;
 609                  */
 610         }
 611
 612         return_PTR(walk_state);
 613 }
 614
 615 /*******************************************************************************
 616  *
 617  * FUNCTION:    acpi_ds_create_walk_state
 618  *
 619  * PARAMETERS:  owner_id        - ID for object creation
 620  *              Origin          - Starting point for this walk
 621  *              mth_desc        - Method object
 622  *              Thread          - Current thread state
 623  *
 624  * RETURN:      Pointer to the new walk state.
 625  *
 626  * DESCRIPTION: Allocate and initialize a new walk state.  The current walk
 627  *              state is set to this new state.
 628  *
 629  ******************************************************************************/
 630
 631 struct acpi_walk_state *acpi_ds_create_walk_state(acpi_owner_id owner_id,
 632                                                   union acpi_parse_object
 633                                                   *origin,
 634                                                   union acpi_operand_object
 635                                                   *mth_desc,
 636                                                   struct acpi_thread_state
 637                                                   *thread)
 638 {
 639         struct acpi_walk_state *walk_state;
 640         acpi_status status;
 641
 642         ACPI_FUNCTION_TRACE("ds_create_walk_state");
 643
 644         walk_state = ACPI_MEM_CALLOCATE(sizeof(struct acpi_walk_state));
 645         if (!walk_state) {
 646                 return_PTR(NULL);
 647         }
 648
 649         walk_state->data_type = ACPI_DESC_TYPE_WALK;
 650         walk_state->owner_id = owner_id;
 651         walk_state->origin = origin;
 652         walk_state->method_desc = mth_desc;
 653         walk_state->thread = thread;
 654
 655         walk_state->parser_state.start_op = origin;
 656
 657         /* Init the method args/local */
 658
 659 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
 660         acpi_ds_method_data_init(walk_state);
 661 #endif
 662
 663         /* Create an initial result stack entry */
 664
 665         status = acpi_ds_result_stack_push(walk_state);
 666         if (ACPI_FAILURE(status)) {
 667                 ACPI_MEM_FREE(walk_state);
 668                 return_PTR(NULL);
 669         }
 670
 671         /* Put the new state at the head of the walk list */
 672
 673         if (thread) {
 674                 acpi_ds_push_walk_state(walk_state, thread);
 675         }
 676
 677         return_PTR(walk_state);
 678 }
 679
 680 /*******************************************************************************
 681  *
 682  * FUNCTION:    acpi_ds_init_aml_walk
 683  *
 684  * PARAMETERS:  walk_state      - New state to be initialized
 685  *              Op              - Current parse op
 686  *              method_node     - Control method NS node, if any
 687  *              aml_start       - Start of AML
 688  *              aml_length      - Length of AML
 689  *              Info            - Method info block (params, etc.)
 690  *              pass_number     - 1, 2, or 3
 691  *
 692  * RETURN:      Status
 693  *
 694  * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
 695  *
 696  ******************************************************************************/
 697
 698 acpi_status
 699 acpi_ds_init_aml_walk(struct acpi_walk_state *walk_state,
 700                       union acpi_parse_object *op,
 701                       struct acpi_namespace_node *method_node,
 702                       u8 * aml_start,
 703                       u32 aml_length,
 704                       struct acpi_parameter_info *info, u8 pass_number)
 705 {
 706         acpi_status status;
 707         struct acpi_parse_state *parser_state = &walk_state->parser_state;
 708         union acpi_parse_object *extra_op;
 709
 710         ACPI_FUNCTION_TRACE("ds_init_aml_walk");
 711
 712         walk_state->parser_state.aml =
 713             walk_state->parser_state.aml_start = aml_start;
 714         walk_state->parser_state.aml_end =
 715             walk_state->parser_state.pkg_end = aml_start + aml_length;
 716
 717         /* The next_op of the next_walk will be the beginning of the method */
 718
 719         walk_state->next_op = NULL;
 720         walk_state->pass_number = pass_number;
 721
 722         if (info) {
 723                 if (info->parameter_type == ACPI_PARAM_GPE) {
 724                         walk_state->gpe_event_info =
 725                             ACPI_CAST_PTR(struct acpi_gpe_event_info,
 726                                           info->parameters);
 727                 } else {
 728                         walk_state->params = info->parameters;
 729                         walk_state->caller_return_desc = &info->return_object;
 730                 }
 731         }
 732
 733         status = acpi_ps_init_scope(&walk_state->parser_state, op);
 734         if (ACPI_FAILURE(status)) {
 735                 return_ACPI_STATUS(status);
 736         }
 737
 738         if (method_node) {
 739                 walk_state->parser_state.start_node = method_node;
 740                 walk_state->walk_type = ACPI_WALK_METHOD;
 741                 walk_state->method_node = method_node;
 742                 walk_state->method_desc =
 743                     acpi_ns_get_attached_object(method_node);
 744
 745                 /* Push start scope on scope stack and make it current  */
 746
 747                 status =
 748                     acpi_ds_scope_stack_push(method_node, ACPI_TYPE_METHOD,
 749                                              walk_state);
 750                 if (ACPI_FAILURE(status)) {
 751                         return_ACPI_STATUS(status);
 752                 }
 753
 754                 /* Init the method arguments */
 755
 756                 status = acpi_ds_method_data_init_args(walk_state->params,
 757                                                        ACPI_METHOD_NUM_ARGS,
 758                                                        walk_state);
 759                 if (ACPI_FAILURE(status)) {
 760                         return_ACPI_STATUS(status);
 761                 }
 762         } else {
 763                 /*
 764                  * Setup the current scope.
 765                  * Find a Named Op that has a namespace node associated with it.
 766                  * search upwards from this Op.  Current scope is the first
 767                  * Op with a namespace node.
 768                  */
 769                 extra_op = parser_state->start_op;
 770                 while (extra_op && !extra_op->common.node) {
 771                         extra_op = extra_op->common.parent;
 772                 }
 773
 774                 if (!extra_op) {
 775                         parser_state->start_node = NULL;
 776                 } else {
 777                         parser_state->start_node = extra_op->common.node;
 778                 }
 779
 780                 if (parser_state->start_node) {
 781                         /* Push start scope on scope stack and make it current  */
 782
 783                         status =
 784                             acpi_ds_scope_stack_push(parser_state->start_node,
 785                                                      parser_state->start_node->
 786                                                      type, walk_state);
 787                         if (ACPI_FAILURE(status)) {
 788                                 return_ACPI_STATUS(status);
 789                         }
 790                 }
 791         }
 792
 793         status = acpi_ds_init_callbacks(walk_state, pass_number);
 794         return_ACPI_STATUS(status);
 795 }
 796
 797 /*******************************************************************************
 798  *
 799  * FUNCTION:    acpi_ds_delete_walk_state
 800  *
 801  * PARAMETERS:  walk_state      - State to delete
 802  *
 803  * RETURN:      Status
 804  *
 805  * DESCRIPTION: Delete a walk state including all internal data structures
 806  *
 807  ******************************************************************************/
 808
 809 void acpi_ds_delete_walk_state(struct acpi_walk_state *walk_state)
 810 {
 811         union acpi_generic_state *state;
 812
 813         ACPI_FUNCTION_TRACE_PTR("ds_delete_walk_state", walk_state);
 814
 815         if (!walk_state) {
 816                 return;
 817         }
 818
 819         if (walk_state->data_type != ACPI_DESC_TYPE_WALK) {
 820                 ACPI_ERROR((AE_INFO, "%p is not a valid walk state",
 821                             walk_state));
 822                 return;
 823         }
 824
 825         if (walk_state->parser_state.scope) {
 826                 ACPI_ERROR((AE_INFO, "%p walk still has a scope list",
 827                             walk_state));
 828         }
 829
 830         /* Always must free any linked control states */
 831
 832         while (walk_state->control_state) {
 833                 state = walk_state->control_state;
 834                 walk_state->control_state = state->common.next;
 835
 836                 acpi_ut_delete_generic_state(state);
 837         }
 838
 839         /* Always must free any linked parse states */
 840
 841         while (walk_state->scope_info) {
 842                 state = walk_state->scope_info;
 843                 walk_state->scope_info = state->common.next;
 844
 845                 acpi_ut_delete_generic_state(state);
 846         }
 847
 848         /* Always must free any stacked result states */
 849
 850         while (walk_state->results) {
 851                 state = walk_state->results;
 852                 walk_state->results = state->common.next;
 853
 854                 acpi_ut_delete_generic_state(state);
 855         }
 856
 857         ACPI_MEM_FREE(walk_state);
 858         return_VOID;
 859 }
 860
 861 #ifdef ACPI_OBSOLETE_FUNCTIONS
 862 /*******************************************************************************
 863  *
 864  * FUNCTION:    acpi_ds_result_insert
 865  *
 866  * PARAMETERS:  Object              - Object to push
 867  *              Index               - Where to insert the object
 868  *              walk_state          - Current Walk state
 869  *
 870  * RETURN:      Status
 871  *
 872  * DESCRIPTION: Insert an object onto this walk's result stack
 873  *
 874  ******************************************************************************/
 875
 876 acpi_status
 877 acpi_ds_result_insert(void *object,
 878                       u32 index, struct acpi_walk_state *walk_state)
 879 {
 880         union acpi_generic_state *state;
 881
 882         ACPI_FUNCTION_NAME("ds_result_insert");
 883
 884         state = walk_state->results;
 885         if (!state) {
 886                 ACPI_ERROR((AE_INFO, "No result object pushed! State=%p",
 887                             walk_state));
 888                 return (AE_NOT_EXIST);
 889         }
 890
 891         if (index >= ACPI_OBJ_NUM_OPERANDS) {
 892                 ACPI_ERROR((AE_INFO,
 893                             "Index out of range: %X Obj=%p State=%p Num=%X",
 894                             index, object, walk_state,
 895                             state->results.num_results));
 896                 return (AE_BAD_PARAMETER);
 897         }
 898
 899         if (!object) {
 900                 ACPI_ERROR((AE_INFO,
 901                             "Null Object! Index=%X Obj=%p State=%p Num=%X",
 902                             index, object, walk_state,
 903                             state->results.num_results));
 904                 return (AE_BAD_PARAMETER);
 905         }
 906
 907         state->results.obj_desc[index] = object;
 908         state->results.num_results++;
 909
 910         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 911                           "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
 912                           object,
 913                           object ?
 914                           acpi_ut_get_object_type_name((union
 915                                                         acpi_operand_object *)
 916                                                        object) : "NULL",
 917                           walk_state, state->results.num_results,
 918                           walk_state->current_result));
 919
 920         return (AE_OK);
 921 }
 922
 923 /*******************************************************************************
 924  *
 925  * FUNCTION:    acpi_ds_obj_stack_delete_all
 926  *
 927  * PARAMETERS:  walk_state          - Current Walk state
 928  *
 929  * RETURN:      Status
 930  *
 931  * DESCRIPTION: Clear the object stack by deleting all objects that are on it.
 932  *              Should be used with great care, if at all!
 933  *
 934  ******************************************************************************/
 935
 936 acpi_status acpi_ds_obj_stack_delete_all(struct acpi_walk_state * walk_state)
 937 {
 938         u32 i;
 939
 940         ACPI_FUNCTION_TRACE_PTR("ds_obj_stack_delete_all", walk_state);
 941
 942         /* The stack size is configurable, but fixed */
 943
 944         for (i = 0; i < ACPI_OBJ_NUM_OPERANDS; i++) {
 945                 if (walk_state->operands[i]) {
 946                         acpi_ut_remove_reference(walk_state->operands[i]);
 947                         walk_state->operands[i] = NULL;
 948                 }
 949         }
 950
 951         return_ACPI_STATUS(AE_OK);
 952 }
 953
 954 /*******************************************************************************
 955  *
 956  * FUNCTION:    acpi_ds_obj_stack_pop_object
 957  *
 958  * PARAMETERS:  Object              - Where to return the popped object
 959  *              walk_state          - Current Walk state
 960  *
 961  * RETURN:      Status
 962  *
 963  * DESCRIPTION: Pop this walk's object stack.  Objects on the stack are NOT
 964  *              deleted by this routine.
 965  *
 966  ******************************************************************************/
 967
 968 acpi_status
 969 acpi_ds_obj_stack_pop_object(union acpi_operand_object **object,
 970                              struct acpi_walk_state *walk_state)
 971 {
 972         ACPI_FUNCTION_NAME("ds_obj_stack_pop_object");
 973
 974         /* Check for stack underflow */
 975
 976         if (walk_state->num_operands == 0) {
 977                 ACPI_ERROR((AE_INFO,
 978                             "Missing operand/stack empty! State=%p #Ops=%X",
 979                             walk_state, walk_state->num_operands));
 980                 *object = NULL;
 981                 return (AE_AML_NO_OPERAND);
 982         }
 983
 984         /* Pop the stack */
 985
 986         walk_state->num_operands--;
 987
 988         /* Check for a valid operand */
 989
 990         if (!walk_state->operands[walk_state->num_operands]) {
 991                 ACPI_ERROR((AE_INFO,
 992                             "Null operand! State=%p #Ops=%X",
 993                             walk_state, walk_state->num_operands));
 994                 *object = NULL;
 995                 return (AE_AML_NO_OPERAND);
 996         }
 997
 998         /* Get operand and set stack entry to null */
 999
1000         *object = walk_state->operands[walk_state->num_operands];
1001         walk_state->operands[walk_state->num_operands] = NULL;
1002
1003         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
1004                           *object, acpi_ut_get_object_type_name(*object),
1005                           walk_state, walk_state->num_operands));
1006
1007         return (AE_OK);
1008 }
1009
1010 /*******************************************************************************
1011  *
1012  * FUNCTION:    acpi_ds_obj_stack_get_value
1013  *
1014  * PARAMETERS:  Index               - Stack index whose value is desired.  Based
1015  *                                    on the top of the stack (index=0 == top)
1016  *              walk_state          - Current Walk state
1017  *
1018  * RETURN:      Pointer to the requested operand
1019  *
1020  * DESCRIPTION: Retrieve an object from this walk's operand stack.  Index must
1021  *              be within the range of the current stack pointer.
1022  *
1023  ******************************************************************************/
1024
1025 void *acpi_ds_obj_stack_get_value(u32 index, struct acpi_walk_state *walk_state)
1026 {
1027
1028         ACPI_FUNCTION_TRACE_PTR("ds_obj_stack_get_value", walk_state);
1029
1030         /* Can't do it if the stack is empty */
1031
1032         if (walk_state->num_operands == 0) {
1033                 return_PTR(NULL);
1034         }
1035
1036         /* or if the index is past the top of the stack */
1037
1038         if (index > (walk_state->num_operands - (u32) 1)) {
1039                 return_PTR(NULL);
1040         }
1041
1042         return_PTR(walk_state->
1043                    operands[(acpi_native_uint) (walk_state->num_operands - 1) -
1044                             index]);
1045 }
1046 #endif