drivers/acpi/acpica/dsopcode.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsopcode - Dispatcher Op Region support and handling of
   4  *                         "control" opcodes
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2008, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acparser.h"
  48 #include "amlcode.h"
  49 #include "acdispat.h"
  50 #include "acinterp.h"
  51 #include "acnamesp.h"
  52 #include "acevents.h"
  53 #include "actables.h"
  54
  55 #define _COMPONENT          ACPI_DISPATCHER
  56 ACPI_MODULE_NAME("dsopcode")
  57
  58 /* Local prototypes */
  59 static acpi_status
  60 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
  61                           struct acpi_namespace_node *scope_node,
  62                           u32 aml_length, u8 * aml_start);
  63
  64 static acpi_status
  65 acpi_ds_init_buffer_field(u16 aml_opcode,
  66                           union acpi_operand_object *obj_desc,
  67                           union acpi_operand_object *buffer_desc,
  68                           union acpi_operand_object *offset_desc,
  69                           union acpi_operand_object *length_desc,
  70                           union acpi_operand_object *result_desc);
  71
  72 /*******************************************************************************
  73  *
  74  * FUNCTION:    acpi_ds_execute_arguments
  75  *
  76  * PARAMETERS:  Node                - Object NS node
  77  *              scope_node          - Parent NS node
  78  *              aml_length          - Length of executable AML
  79  *              aml_start           - Pointer to the AML
  80  *
  81  * RETURN:      Status.
  82  *
  83  * DESCRIPTION: Late (deferred) execution of region or field arguments
  84  *
  85  ******************************************************************************/
  86
  87 static acpi_status
  88 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
  89                           struct acpi_namespace_node *scope_node,
  90                           u32 aml_length, u8 * aml_start)
  91 {
  92         acpi_status status;
  93         union acpi_parse_object *op;
  94         struct acpi_walk_state *walk_state;
  95
  96         ACPI_FUNCTION_TRACE(ds_execute_arguments);
  97
  98         /*
  99          * Allocate a new parser op to be the root of the parsed tree
 100          */
 101         op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
 102         if (!op) {
 103                 return_ACPI_STATUS(AE_NO_MEMORY);
 104         }
 105
 106         /* Save the Node for use in acpi_ps_parse_aml */
 107
 108         op->common.node = scope_node;
 109
 110         /* Create and initialize a new parser state */
 111
 112         walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
 113         if (!walk_state) {
 114                 status = AE_NO_MEMORY;
 115                 goto cleanup;
 116         }
 117
 118         status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
 119                                        aml_length, NULL, ACPI_IMODE_LOAD_PASS1);
 120         if (ACPI_FAILURE(status)) {
 121                 acpi_ds_delete_walk_state(walk_state);
 122                 goto cleanup;
 123         }
 124
 125         /* Mark this parse as a deferred opcode */
 126
 127         walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP;
 128         walk_state->deferred_node = node;
 129
 130         /* Pass1: Parse the entire declaration */
 131
 132         status = acpi_ps_parse_aml(walk_state);
 133         if (ACPI_FAILURE(status)) {
 134                 goto cleanup;
 135         }
 136
 137         /* Get and init the Op created above */
 138
 139         op->common.node = node;
 140         acpi_ps_delete_parse_tree(op);
 141
 142         /* Evaluate the deferred arguments */
 143
 144         op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
 145         if (!op) {
 146                 return_ACPI_STATUS(AE_NO_MEMORY);
 147         }
 148
 149         op->common.node = scope_node;
 150
 151         /* Create and initialize a new parser state */
 152
 153         walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
 154         if (!walk_state) {
 155                 status = AE_NO_MEMORY;
 156                 goto cleanup;
 157         }
 158
 159         /* Execute the opcode and arguments */
 160
 161         status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
 162                                        aml_length, NULL, ACPI_IMODE_EXECUTE);
 163         if (ACPI_FAILURE(status)) {
 164                 acpi_ds_delete_walk_state(walk_state);
 165                 goto cleanup;
 166         }
 167
 168         /* Mark this execution as a deferred opcode */
 169
 170         walk_state->deferred_node = node;
 171         status = acpi_ps_parse_aml(walk_state);
 172
 173       cleanup:
 174         acpi_ps_delete_parse_tree(op);
 175         return_ACPI_STATUS(status);
 176 }
 177
 178 /*******************************************************************************
 179  *
 180  * FUNCTION:    acpi_ds_get_buffer_field_arguments
 181  *
 182  * PARAMETERS:  obj_desc        - A valid buffer_field object
 183  *
 184  * RETURN:      Status.
 185  *
 186  * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late
 187  *              evaluation of these field attributes.
 188  *
 189  ******************************************************************************/
 190
 191 acpi_status
 192 acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
 193 {
 194         union acpi_operand_object *extra_desc;
 195         struct acpi_namespace_node *node;
 196         acpi_status status;
 197
 198         ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_field_arguments, obj_desc);
 199
 200         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 201                 return_ACPI_STATUS(AE_OK);
 202         }
 203
 204         /* Get the AML pointer (method object) and buffer_field node */
 205
 206         extra_desc = acpi_ns_get_secondary_object(obj_desc);
 207         node = obj_desc->buffer_field.node;
 208
 209         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 210                         (ACPI_TYPE_BUFFER_FIELD, node, NULL));
 211         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BufferField Arg Init\n",
 212                           acpi_ut_get_node_name(node)));
 213
 214         /* Execute the AML code for the term_arg arguments */
 215
 216         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
 217                                            extra_desc->extra.aml_length,
 218                                            extra_desc->extra.aml_start);
 219         return_ACPI_STATUS(status);
 220 }
 221
 222 /*******************************************************************************
 223  *
 224  * FUNCTION:    acpi_ds_get_bank_field_arguments
 225  *
 226  * PARAMETERS:  obj_desc        - A valid bank_field object
 227  *
 228  * RETURN:      Status.
 229  *
 230  * DESCRIPTION: Get bank_field bank_value. This implements the late
 231  *              evaluation of these field attributes.
 232  *
 233  ******************************************************************************/
 234
 235 acpi_status
 236 acpi_ds_get_bank_field_arguments(union acpi_operand_object *obj_desc)
 237 {
 238         union acpi_operand_object *extra_desc;
 239         struct acpi_namespace_node *node;
 240         acpi_status status;
 241
 242         ACPI_FUNCTION_TRACE_PTR(ds_get_bank_field_arguments, obj_desc);
 243
 244         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 245                 return_ACPI_STATUS(AE_OK);
 246         }
 247
 248         /* Get the AML pointer (method object) and bank_field node */
 249
 250         extra_desc = acpi_ns_get_secondary_object(obj_desc);
 251         node = obj_desc->bank_field.node;
 252
 253         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 254                         (ACPI_TYPE_LOCAL_BANK_FIELD, node, NULL));
 255         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BankField Arg Init\n",
 256                           acpi_ut_get_node_name(node)));
 257
 258         /* Execute the AML code for the term_arg arguments */
 259
 260         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
 261                                            extra_desc->extra.aml_length,
 262                                            extra_desc->extra.aml_start);
 263         return_ACPI_STATUS(status);
 264 }
 265
 266 /*******************************************************************************
 267  *
 268  * FUNCTION:    acpi_ds_get_buffer_arguments
 269  *
 270  * PARAMETERS:  obj_desc        - A valid Buffer object
 271  *
 272  * RETURN:      Status.
 273  *
 274  * DESCRIPTION: Get Buffer length and initializer byte list.  This implements
 275  *              the late evaluation of these attributes.
 276  *
 277  ******************************************************************************/
 278
 279 acpi_status acpi_ds_get_buffer_arguments(union acpi_operand_object *obj_desc)
 280 {
 281         struct acpi_namespace_node *node;
 282         acpi_status status;
 283
 284         ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_arguments, obj_desc);
 285
 286         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 287                 return_ACPI_STATUS(AE_OK);
 288         }
 289
 290         /* Get the Buffer node */
 291
 292         node = obj_desc->buffer.node;
 293         if (!node) {
 294                 ACPI_ERROR((AE_INFO,
 295                             "No pointer back to NS node in buffer obj %p",
 296                             obj_desc));
 297                 return_ACPI_STATUS(AE_AML_INTERNAL);
 298         }
 299
 300         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n"));
 301
 302         /* Execute the AML code for the term_arg arguments */
 303
 304         status = acpi_ds_execute_arguments(node, node,
 305                                            obj_desc->buffer.aml_length,
 306                                            obj_desc->buffer.aml_start);
 307         return_ACPI_STATUS(status);
 308 }
 309
 310 /*******************************************************************************
 311  *
 312  * FUNCTION:    acpi_ds_get_package_arguments
 313  *
 314  * PARAMETERS:  obj_desc        - A valid Package object
 315  *
 316  * RETURN:      Status.
 317  *
 318  * DESCRIPTION: Get Package length and initializer byte list.  This implements
 319  *              the late evaluation of these attributes.
 320  *
 321  ******************************************************************************/
 322
 323 acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc)
 324 {
 325         struct acpi_namespace_node *node;
 326         acpi_status status;
 327
 328         ACPI_FUNCTION_TRACE_PTR(ds_get_package_arguments, obj_desc);
 329
 330         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 331                 return_ACPI_STATUS(AE_OK);
 332         }
 333
 334         /* Get the Package node */
 335
 336         node = obj_desc->package.node;
 337         if (!node) {
 338                 ACPI_ERROR((AE_INFO,
 339                             "No pointer back to NS node in package %p",
 340                             obj_desc));
 341                 return_ACPI_STATUS(AE_AML_INTERNAL);
 342         }
 343
 344         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n"));
 345
 346         /* Execute the AML code for the term_arg arguments */
 347
 348         status = acpi_ds_execute_arguments(node, node,
 349                                            obj_desc->package.aml_length,
 350                                            obj_desc->package.aml_start);
 351         return_ACPI_STATUS(status);
 352 }
 353
 354 /*****************************************************************************
 355  *
 356  * FUNCTION:    acpi_ds_get_region_arguments
 357  *
 358  * PARAMETERS:  obj_desc        - A valid region object
 359  *
 360  * RETURN:      Status.
 361  *
 362  * DESCRIPTION: Get region address and length.  This implements the late
 363  *              evaluation of these region attributes.
 364  *
 365  ****************************************************************************/
 366
 367 acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
 368 {
 369         struct acpi_namespace_node *node;
 370         acpi_status status;
 371         union acpi_operand_object *extra_desc;
 372
 373         ACPI_FUNCTION_TRACE_PTR(ds_get_region_arguments, obj_desc);
 374
 375         if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
 376                 return_ACPI_STATUS(AE_OK);
 377         }
 378
 379         extra_desc = acpi_ns_get_secondary_object(obj_desc);
 380         if (!extra_desc) {
 381                 return_ACPI_STATUS(AE_NOT_EXIST);
 382         }
 383
 384         /* Get the Region node */
 385
 386         node = obj_desc->region.node;
 387
 388         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 389                         (ACPI_TYPE_REGION, node, NULL));
 390
 391         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] OpRegion Arg Init at AML %p\n",
 392                           acpi_ut_get_node_name(node),
 393                           extra_desc->extra.aml_start));
 394
 395         /* Execute the argument AML */
 396
 397         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
 398                                            extra_desc->extra.aml_length,
 399                                            extra_desc->extra.aml_start);
 400         return_ACPI_STATUS(status);
 401 }
 402
 403 /*******************************************************************************
 404  *
 405  * FUNCTION:    acpi_ds_initialize_region
 406  *
 407  * PARAMETERS:  obj_handle      - Region namespace node
 408  *
 409  * RETURN:      Status
 410  *
 411  * DESCRIPTION: Front end to ev_initialize_region
 412  *
 413  ******************************************************************************/
 414
 415 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
 416 {
 417         union acpi_operand_object *obj_desc;
 418         acpi_status status;
 419
 420         obj_desc = acpi_ns_get_attached_object(obj_handle);
 421
 422         /* Namespace is NOT locked */
 423
 424         status = acpi_ev_initialize_region(obj_desc, FALSE);
 425         return (status);
 426 }
 427
 428 /*******************************************************************************
 429  *
 430  * FUNCTION:    acpi_ds_init_buffer_field
 431  *
 432  * PARAMETERS:  aml_opcode      - create_xxx_field
 433  *              obj_desc        - buffer_field object
 434  *              buffer_desc     - Host Buffer
 435  *              offset_desc     - Offset into buffer
 436  *              length_desc     - Length of field (CREATE_FIELD_OP only)
 437  *              result_desc     - Where to store the result
 438  *
 439  * RETURN:      Status
 440  *
 441  * DESCRIPTION: Perform actual initialization of a buffer field
 442  *
 443  ******************************************************************************/
 444
 445 static acpi_status
 446 acpi_ds_init_buffer_field(u16 aml_opcode,
 447                           union acpi_operand_object *obj_desc,
 448                           union acpi_operand_object *buffer_desc,
 449                           union acpi_operand_object *offset_desc,
 450                           union acpi_operand_object *length_desc,
 451                           union acpi_operand_object *result_desc)
 452 {
 453         u32 offset;
 454         u32 bit_offset;
 455         u32 bit_count;
 456         u8 field_flags;
 457         acpi_status status;
 458
 459         ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
 460
 461         /* Host object must be a Buffer */
 462
 463         if (buffer_desc->common.type != ACPI_TYPE_BUFFER) {
 464                 ACPI_ERROR((AE_INFO,
 465                             "Target of Create Field is not a Buffer object - %s",
 466                             acpi_ut_get_object_type_name(buffer_desc)));
 467
 468                 status = AE_AML_OPERAND_TYPE;
 469                 goto cleanup;
 470         }
 471
 472         /*
 473          * The last parameter to all of these opcodes (result_desc) started
 474          * out as a name_string, and should therefore now be a NS node
 475          * after resolution in acpi_ex_resolve_operands().
 476          */
 477         if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
 478                 ACPI_ERROR((AE_INFO,
 479                             "(%s) destination not a NS Node [%s]",
 480                             acpi_ps_get_opcode_name(aml_opcode),
 481                             acpi_ut_get_descriptor_name(result_desc)));
 482
 483                 status = AE_AML_OPERAND_TYPE;
 484                 goto cleanup;
 485         }
 486
 487         offset = (u32) offset_desc->integer.value;
 488
 489         /*
 490          * Setup the Bit offsets and counts, according to the opcode
 491          */
 492         switch (aml_opcode) {
 493         case AML_CREATE_FIELD_OP:
 494
 495                 /* Offset is in bits, count is in bits */
 496
 497                 field_flags = AML_FIELD_ACCESS_BYTE;
 498                 bit_offset = offset;
 499                 bit_count = (u32) length_desc->integer.value;
 500
 501                 /* Must have a valid (>0) bit count */
 502
 503                 if (bit_count == 0) {
 504                         ACPI_ERROR((AE_INFO,
 505                                     "Attempt to CreateField of length zero"));
 506                         status = AE_AML_OPERAND_VALUE;
 507                         goto cleanup;
 508                 }
 509                 break;
 510
 511         case AML_CREATE_BIT_FIELD_OP:
 512
 513                 /* Offset is in bits, Field is one bit */
 514
 515                 bit_offset = offset;
 516                 bit_count = 1;
 517                 field_flags = AML_FIELD_ACCESS_BYTE;
 518                 break;
 519
 520         case AML_CREATE_BYTE_FIELD_OP:
 521
 522                 /* Offset is in bytes, field is one byte */
 523
 524                 bit_offset = 8 * offset;
 525                 bit_count = 8;
 526                 field_flags = AML_FIELD_ACCESS_BYTE;
 527                 break;
 528
 529         case AML_CREATE_WORD_FIELD_OP:
 530
 531                 /* Offset is in bytes, field is one word */
 532
 533                 bit_offset = 8 * offset;
 534                 bit_count = 16;
 535                 field_flags = AML_FIELD_ACCESS_WORD;
 536                 break;
 537
 538         case AML_CREATE_DWORD_FIELD_OP:
 539
 540                 /* Offset is in bytes, field is one dword */
 541
 542                 bit_offset = 8 * offset;
 543                 bit_count = 32;
 544                 field_flags = AML_FIELD_ACCESS_DWORD;
 545                 break;
 546
 547         case AML_CREATE_QWORD_FIELD_OP:
 548
 549                 /* Offset is in bytes, field is one qword */
 550
 551                 bit_offset = 8 * offset;
 552                 bit_count = 64;
 553                 field_flags = AML_FIELD_ACCESS_QWORD;
 554                 break;
 555
 556         default:
 557
 558                 ACPI_ERROR((AE_INFO,
 559                             "Unknown field creation opcode %02x", aml_opcode));
 560                 status = AE_AML_BAD_OPCODE;
 561                 goto cleanup;
 562         }
 563
 564         /* Entire field must fit within the current length of the buffer */
 565
 566         if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
 567                 ACPI_ERROR((AE_INFO,
 568                             "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)",
 569                             acpi_ut_get_node_name(result_desc),
 570                             bit_offset + bit_count,
 571                             acpi_ut_get_node_name(buffer_desc->buffer.node),
 572                             8 * (u32) buffer_desc->buffer.length));
 573                 status = AE_AML_BUFFER_LIMIT;
 574                 goto cleanup;
 575         }
 576
 577         /*
 578          * Initialize areas of the field object that are common to all fields
 579          * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
 580          * UPDATE_RULE = 0 (UPDATE_PRESERVE)
 581          */
 582         status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
 583                                                   bit_offset, bit_count);
 584         if (ACPI_FAILURE(status)) {
 585                 goto cleanup;
 586         }
 587
 588         obj_desc->buffer_field.buffer_obj = buffer_desc;
 589
 590         /* Reference count for buffer_desc inherits obj_desc count */
 591
 592         buffer_desc->common.reference_count = (u16)
 593             (buffer_desc->common.reference_count +
 594              obj_desc->common.reference_count);
 595
 596       cleanup:
 597
 598         /* Always delete the operands */
 599
 600         acpi_ut_remove_reference(offset_desc);
 601         acpi_ut_remove_reference(buffer_desc);
 602
 603         if (aml_opcode == AML_CREATE_FIELD_OP) {
 604                 acpi_ut_remove_reference(length_desc);
 605         }
 606
 607         /* On failure, delete the result descriptor */
 608
 609         if (ACPI_FAILURE(status)) {
 610                 acpi_ut_remove_reference(result_desc);  /* Result descriptor */
 611         } else {
 612                 /* Now the address and length are valid for this buffer_field */
 613
 614                 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
 615         }
 616
 617         return_ACPI_STATUS(status);
 618 }
 619
 620 /*******************************************************************************
 621  *
 622  * FUNCTION:    acpi_ds_eval_buffer_field_operands
 623  *
 624  * PARAMETERS:  walk_state      - Current walk
 625  *              Op              - A valid buffer_field Op object
 626  *
 627  * RETURN:      Status
 628  *
 629  * DESCRIPTION: Get buffer_field Buffer and Index
 630  *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 631  *
 632  ******************************************************************************/
 633
 634 acpi_status
 635 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
 636                                    union acpi_parse_object *op)
 637 {
 638         acpi_status status;
 639         union acpi_operand_object *obj_desc;
 640         struct acpi_namespace_node *node;
 641         union acpi_parse_object *next_op;
 642
 643         ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
 644
 645         /*
 646          * This is where we evaluate the address and length fields of the
 647          * create_xxx_field declaration
 648          */
 649         node = op->common.node;
 650
 651         /* next_op points to the op that holds the Buffer */
 652
 653         next_op = op->common.value.arg;
 654
 655         /* Evaluate/create the address and length operands */
 656
 657         status = acpi_ds_create_operands(walk_state, next_op);
 658         if (ACPI_FAILURE(status)) {
 659                 return_ACPI_STATUS(status);
 660         }
 661
 662         obj_desc = acpi_ns_get_attached_object(node);
 663         if (!obj_desc) {
 664                 return_ACPI_STATUS(AE_NOT_EXIST);
 665         }
 666
 667         /* Resolve the operands */
 668
 669         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 670                                           ACPI_WALK_OPERANDS, walk_state);
 671         if (ACPI_FAILURE(status)) {
 672                 ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)",
 673                             acpi_ps_get_opcode_name(op->common.aml_opcode),
 674                             status));
 675
 676                 return_ACPI_STATUS(status);
 677         }
 678
 679         /* Initialize the Buffer Field */
 680
 681         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 682
 683                 /* NOTE: Slightly different operands for this opcode */
 684
 685                 status =
 686                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 687                                               walk_state->operands[0],
 688                                               walk_state->operands[1],
 689                                               walk_state->operands[2],
 690                                               walk_state->operands[3]);
 691         } else {
 692                 /* All other, create_xxx_field opcodes */
 693
 694                 status =
 695                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 696                                               walk_state->operands[0],
 697                                               walk_state->operands[1], NULL,
 698                                               walk_state->operands[2]);
 699         }
 700
 701         return_ACPI_STATUS(status);
 702 }
 703
 704 /*******************************************************************************
 705  *
 706  * FUNCTION:    acpi_ds_eval_region_operands
 707  *
 708  * PARAMETERS:  walk_state      - Current walk
 709  *              Op              - A valid region Op object
 710  *
 711  * RETURN:      Status
 712  *
 713  * DESCRIPTION: Get region address and length
 714  *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 715  *
 716  ******************************************************************************/
 717
 718 acpi_status
 719 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
 720                              union acpi_parse_object *op)
 721 {
 722         acpi_status status;
 723         union acpi_operand_object *obj_desc;
 724         union acpi_operand_object *operand_desc;
 725         struct acpi_namespace_node *node;
 726         union acpi_parse_object *next_op;
 727
 728         ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
 729
 730         /*
 731          * This is where we evaluate the address and length fields of the
 732          * op_region declaration
 733          */
 734         node = op->common.node;
 735
 736         /* next_op points to the op that holds the space_iD */
 737
 738         next_op = op->common.value.arg;
 739
 740         /* next_op points to address op */
 741
 742         next_op = next_op->common.next;
 743
 744         /* Evaluate/create the address and length operands */
 745
 746         status = acpi_ds_create_operands(walk_state, next_op);
 747         if (ACPI_FAILURE(status)) {
 748                 return_ACPI_STATUS(status);
 749         }
 750
 751         /* Resolve the length and address operands to numbers */
 752
 753         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 754                                           ACPI_WALK_OPERANDS, walk_state);
 755         if (ACPI_FAILURE(status)) {
 756                 return_ACPI_STATUS(status);
 757         }
 758
 759         obj_desc = acpi_ns_get_attached_object(node);
 760         if (!obj_desc) {
 761                 return_ACPI_STATUS(AE_NOT_EXIST);
 762         }
 763
 764         /*
 765          * Get the length operand and save it
 766          * (at Top of stack)
 767          */
 768         operand_desc = walk_state->operands[walk_state->num_operands - 1];
 769
 770         obj_desc->region.length = (u32) operand_desc->integer.value;
 771         acpi_ut_remove_reference(operand_desc);
 772
 773         /*
 774          * Get the address and save it
 775          * (at top of stack - 1)
 776          */
 777         operand_desc = walk_state->operands[walk_state->num_operands - 2];
 778
 779         obj_desc->region.address = (acpi_physical_address)
 780             operand_desc->integer.value;
 781         acpi_ut_remove_reference(operand_desc);
 782
 783         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 784                           obj_desc,
 785                           ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
 786                           obj_desc->region.length));
 787
 788         /* Now the address and length are valid for this opregion */
 789
 790         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 791
 792         return_ACPI_STATUS(status);
 793 }
 794
 795 /*******************************************************************************
 796  *
 797  * FUNCTION:    acpi_ds_eval_table_region_operands
 798  *
 799  * PARAMETERS:  walk_state      - Current walk
 800  *              Op              - A valid region Op object
 801  *
 802  * RETURN:      Status
 803  *
 804  * DESCRIPTION: Get region address and length
 805  *              Called from acpi_ds_exec_end_op during data_table_region parse tree walk
 806  *
 807  ******************************************************************************/
 808
 809 acpi_status
 810 acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 811                                    union acpi_parse_object *op)
 812 {
 813         acpi_status status;
 814         union acpi_operand_object *obj_desc;
 815         union acpi_operand_object **operand;
 816         struct acpi_namespace_node *node;
 817         union acpi_parse_object *next_op;
 818         u32 table_index;
 819         struct acpi_table_header *table;
 820
 821         ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
 822
 823         /*
 824          * This is where we evaluate the signature_string and oem_iDString
 825          * and oem_table_iDString of the data_table_region declaration
 826          */
 827         node = op->common.node;
 828
 829         /* next_op points to signature_string op */
 830
 831         next_op = op->common.value.arg;
 832
 833         /*
 834          * Evaluate/create the signature_string and oem_iDString
 835          * and oem_table_iDString operands
 836          */
 837         status = acpi_ds_create_operands(walk_state, next_op);
 838         if (ACPI_FAILURE(status)) {
 839                 return_ACPI_STATUS(status);
 840         }
 841
 842         /*
 843          * Resolve the signature_string and oem_iDString
 844          * and oem_table_iDString operands
 845          */
 846         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 847                                           ACPI_WALK_OPERANDS, walk_state);
 848         if (ACPI_FAILURE(status)) {
 849                 return_ACPI_STATUS(status);
 850         }
 851
 852         operand = &walk_state->operands[0];
 853
 854         /* Find the ACPI table */
 855
 856         status = acpi_tb_find_table(operand[0]->string.pointer,
 857                                     operand[1]->string.pointer,
 858                                     operand[2]->string.pointer, &table_index);
 859         if (ACPI_FAILURE(status)) {
 860                 return_ACPI_STATUS(status);
 861         }
 862
 863         acpi_ut_remove_reference(operand[0]);
 864         acpi_ut_remove_reference(operand[1]);
 865         acpi_ut_remove_reference(operand[2]);
 866
 867         status = acpi_get_table_by_index(table_index, &table);
 868         if (ACPI_FAILURE(status)) {
 869                 return_ACPI_STATUS(status);
 870         }
 871
 872         obj_desc = acpi_ns_get_attached_object(node);
 873         if (!obj_desc) {
 874                 return_ACPI_STATUS(AE_NOT_EXIST);
 875         }
 876
 877         obj_desc->region.address =
 878             (acpi_physical_address) ACPI_TO_INTEGER(table);
 879         obj_desc->region.length = table->length;
 880
 881         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 882                           obj_desc,
 883                           ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
 884                           obj_desc->region.length));
 885
 886         /* Now the address and length are valid for this opregion */
 887
 888         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 889
 890         return_ACPI_STATUS(status);
 891 }
 892
 893 /*******************************************************************************
 894  *
 895  * FUNCTION:    acpi_ds_eval_data_object_operands
 896  *
 897  * PARAMETERS:  walk_state      - Current walk
 898  *              Op              - A valid data_object Op object
 899  *              obj_desc        - data_object
 900  *
 901  * RETURN:      Status
 902  *
 903  * DESCRIPTION: Get the operands and complete the following data object types:
 904  *              Buffer, Package.
 905  *
 906  ******************************************************************************/
 907
 908 acpi_status
 909 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 910                                   union acpi_parse_object *op,
 911                                   union acpi_operand_object *obj_desc)
 912 {
 913         acpi_status status;
 914         union acpi_operand_object *arg_desc;
 915         u32 length;
 916
 917         ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
 918
 919         /* The first operand (for all of these data objects) is the length */
 920
 921         /*
 922          * Set proper index into operand stack for acpi_ds_obj_stack_push
 923          * invoked inside acpi_ds_create_operand.
 924          */
 925         walk_state->operand_index = walk_state->num_operands;
 926
 927         status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 928         if (ACPI_FAILURE(status)) {
 929                 return_ACPI_STATUS(status);
 930         }
 931
 932         status = acpi_ex_resolve_operands(walk_state->opcode,
 933                                           &(walk_state->
 934                                             operands[walk_state->num_operands -
 935                                                      1]), walk_state);
 936         if (ACPI_FAILURE(status)) {
 937                 return_ACPI_STATUS(status);
 938         }
 939
 940         /* Extract length operand */
 941
 942         arg_desc = walk_state->operands[walk_state->num_operands - 1];
 943         length = (u32) arg_desc->integer.value;
 944
 945         /* Cleanup for length operand */
 946
 947         status = acpi_ds_obj_stack_pop(1, walk_state);
 948         if (ACPI_FAILURE(status)) {
 949                 return_ACPI_STATUS(status);
 950         }
 951
 952         acpi_ut_remove_reference(arg_desc);
 953
 954         /*
 955          * Create the actual data object
 956          */
 957         switch (op->common.aml_opcode) {
 958         case AML_BUFFER_OP:
 959
 960                 status =
 961                     acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 962                                                       &obj_desc);
 963                 break;
 964
 965         case AML_PACKAGE_OP:
 966         case AML_VAR_PACKAGE_OP:
 967
 968                 status =
 969                     acpi_ds_build_internal_package_obj(walk_state, op, length,
 970                                                        &obj_desc);
 971                 break;
 972
 973         default:
 974                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 975         }
 976
 977         if (ACPI_SUCCESS(status)) {
 978                 /*
 979                  * Return the object in the walk_state, unless the parent is a package -
 980                  * in this case, the return object will be stored in the parse tree
 981                  * for the package.
 982                  */
 983                 if ((!op->common.parent) ||
 984                     ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
 985                      (op->common.parent->common.aml_opcode !=
 986                       AML_VAR_PACKAGE_OP)
 987                      && (op->common.parent->common.aml_opcode != AML_NAME_OP))) {
 988                         walk_state->result_obj = obj_desc;
 989                 }
 990         }
 991
 992         return_ACPI_STATUS(status);
 993 }
 994
 995 /*******************************************************************************
 996  *
 997  * FUNCTION:    acpi_ds_eval_bank_field_operands
 998  *
 999  * PARAMETERS:  walk_state      - Current walk
1000  *              Op              - A valid bank_field Op object
1001  *
1002  * RETURN:      Status
1003  *
1004  * DESCRIPTION: Get bank_field bank_value
1005  *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
1006  *
1007  ******************************************************************************/
1008
1009 acpi_status
1010 acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
1011                                  union acpi_parse_object *op)
1012 {
1013         acpi_status status;
1014         union acpi_operand_object *obj_desc;
1015         union acpi_operand_object *operand_desc;
1016         struct acpi_namespace_node *node;
1017         union acpi_parse_object *next_op;
1018         union acpi_parse_object *arg;
1019
1020         ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
1021
1022         /*
1023          * This is where we evaluate the bank_value field of the
1024          * bank_field declaration
1025          */
1026
1027         /* next_op points to the op that holds the Region */
1028
1029         next_op = op->common.value.arg;
1030
1031         /* next_op points to the op that holds the Bank Register */
1032
1033         next_op = next_op->common.next;
1034
1035         /* next_op points to the op that holds the Bank Value */
1036
1037         next_op = next_op->common.next;
1038
1039         /*
1040          * Set proper index into operand stack for acpi_ds_obj_stack_push
1041          * invoked inside acpi_ds_create_operand.
1042          *
1043          * We use walk_state->Operands[0] to store the evaluated bank_value
1044          */
1045         walk_state->operand_index = 0;
1046
1047         status = acpi_ds_create_operand(walk_state, next_op, 0);
1048         if (ACPI_FAILURE(status)) {
1049                 return_ACPI_STATUS(status);
1050         }
1051
1052         status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
1053         if (ACPI_FAILURE(status)) {
1054                 return_ACPI_STATUS(status);
1055         }
1056
1057         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
1058                            acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
1059         /*
1060          * Get the bank_value operand and save it
1061          * (at Top of stack)
1062          */
1063         operand_desc = walk_state->operands[0];
1064
1065         /* Arg points to the start Bank Field */
1066
1067         arg = acpi_ps_get_arg(op, 4);
1068         while (arg) {
1069
1070                 /* Ignore OFFSET and ACCESSAS terms here */
1071
1072                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
1073                         node = arg->common.node;
1074
1075                         obj_desc = acpi_ns_get_attached_object(node);
1076                         if (!obj_desc) {
1077                                 return_ACPI_STATUS(AE_NOT_EXIST);
1078                         }
1079
1080                         obj_desc->bank_field.value =
1081                             (u32) operand_desc->integer.value;
1082                 }
1083
1084                 /* Move to next field in the list */
1085
1086                 arg = arg->common.next;
1087         }
1088
1089         acpi_ut_remove_reference(operand_desc);
1090         return_ACPI_STATUS(status);
1091 }
1092
1093 /*******************************************************************************
1094  *
1095  * FUNCTION:    acpi_ds_exec_begin_control_op
1096  *
1097  * PARAMETERS:  walk_list       - The list that owns the walk stack
1098  *              Op              - The control Op
1099  *
1100  * RETURN:      Status
1101  *
1102  * DESCRIPTION: Handles all control ops encountered during control method
1103  *              execution.
1104  *
1105  ******************************************************************************/
1106
1107 acpi_status
1108 acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
1109                               union acpi_parse_object *op)
1110 {
1111         acpi_status status = AE_OK;
1112         union acpi_generic_state *control_state;
1113
1114         ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
1115
1116         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
1117                           op->common.aml_opcode, walk_state));
1118
1119         switch (op->common.aml_opcode) {
1120         case AML_WHILE_OP:
1121
1122                 /*
1123                  * If this is an additional iteration of a while loop, continue.
1124                  * There is no need to allocate a new control state.
1125                  */
1126                 if (walk_state->control_state) {
1127                         if (walk_state->control_state->control.aml_predicate_start
1128                                 == (walk_state->parser_state.aml - 1)) {
1129
1130                                 /* Reset the state to start-of-loop */
1131
1132                                 walk_state->control_state->common.state =
1133                                     ACPI_CONTROL_CONDITIONAL_EXECUTING;
1134                                 break;
1135                         }
1136                 }
1137
1138                 /*lint -fallthrough */
1139
1140         case AML_IF_OP:
1141
1142                 /*
1143                  * IF/WHILE: Create a new control state to manage these
1144                  * constructs. We need to manage these as a stack, in order
1145                  * to handle nesting.
1146                  */
1147                 control_state = acpi_ut_create_control_state();
1148                 if (!control_state) {
1149                         status = AE_NO_MEMORY;
1150                         break;
1151                 }
1152                 /*
1153                  * Save a pointer to the predicate for multiple executions
1154                  * of a loop
1155                  */
1156                 control_state->control.aml_predicate_start =
1157                     walk_state->parser_state.aml - 1;
1158                 control_state->control.package_end =
1159                     walk_state->parser_state.pkg_end;
1160                 control_state->control.opcode = op->common.aml_opcode;
1161
1162                 /* Push the control state on this walk's control stack */
1163
1164                 acpi_ut_push_generic_state(&walk_state->control_state,
1165                                            control_state);
1166                 break;
1167
1168         case AML_ELSE_OP:
1169
1170                 /* Predicate is in the state object */
1171                 /* If predicate is true, the IF was executed, ignore ELSE part */
1172
1173                 if (walk_state->last_predicate) {
1174                         status = AE_CTRL_TRUE;
1175                 }
1176
1177                 break;
1178
1179         case AML_RETURN_OP:
1180
1181                 break;
1182
1183         default:
1184                 break;
1185         }
1186
1187         return (status);
1188 }
1189
1190 /*******************************************************************************
1191  *
1192  * FUNCTION:    acpi_ds_exec_end_control_op
1193  *
1194  * PARAMETERS:  walk_list       - The list that owns the walk stack
1195  *              Op              - The control Op
1196  *
1197  * RETURN:      Status
1198  *
1199  * DESCRIPTION: Handles all control ops encountered during control method
1200  *              execution.
1201  *
1202  ******************************************************************************/
1203
1204 acpi_status
1205 acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
1206                             union acpi_parse_object * op)
1207 {
1208         acpi_status status = AE_OK;
1209         union acpi_generic_state *control_state;
1210
1211         ACPI_FUNCTION_NAME(ds_exec_end_control_op);
1212
1213         switch (op->common.aml_opcode) {
1214         case AML_IF_OP:
1215
1216                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
1217
1218                 /*
1219                  * Save the result of the predicate in case there is an
1220                  * ELSE to come
1221                  */
1222                 walk_state->last_predicate =
1223                     (u8) walk_state->control_state->common.value;
1224
1225                 /*
1226                  * Pop the control state that was created at the start
1227                  * of the IF and free it
1228                  */
1229                 control_state =
1230                     acpi_ut_pop_generic_state(&walk_state->control_state);
1231                 acpi_ut_delete_generic_state(control_state);
1232                 break;
1233
1234         case AML_ELSE_OP:
1235
1236                 break;
1237
1238         case AML_WHILE_OP:
1239
1240                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
1241
1242                 control_state = walk_state->control_state;
1243                 if (control_state->common.value) {
1244
1245                         /* Predicate was true, the body of the loop was just executed */
1246
1247                         /*
1248                          * This loop counter mechanism allows the interpreter to escape
1249                          * possibly infinite loops. This can occur in poorly written AML
1250                          * when the hardware does not respond within a while loop and the
1251                          * loop does not implement a timeout.
1252                          */
1253                         control_state->control.loop_count++;
1254                         if (control_state->control.loop_count >
1255                                 ACPI_MAX_LOOP_ITERATIONS) {
1256                                 status = AE_AML_INFINITE_LOOP;
1257                                 break;
1258                         }
1259
1260                         /*
1261                          * Go back and evaluate the predicate and maybe execute the loop
1262                          * another time
1263                          */
1264                         status = AE_CTRL_PENDING;
1265                         walk_state->aml_last_while =
1266                             control_state->control.aml_predicate_start;
1267                         break;
1268                 }
1269
1270                 /* Predicate was false, terminate this while loop */
1271
1272                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1273                                   "[WHILE_OP] termination! Op=%p\n", op));
1274
1275                 /* Pop this control state and free it */
1276
1277                 control_state =
1278                     acpi_ut_pop_generic_state(&walk_state->control_state);
1279                 acpi_ut_delete_generic_state(control_state);
1280                 break;
1281
1282         case AML_RETURN_OP:
1283
1284                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1285                                   "[RETURN_OP] Op=%p Arg=%p\n", op,
1286                                   op->common.value.arg));
1287
1288                 /*
1289                  * One optional operand -- the return value
1290                  * It can be either an immediate operand or a result that
1291                  * has been bubbled up the tree
1292                  */
1293                 if (op->common.value.arg) {
1294
1295                         /* Since we have a real Return(), delete any implicit return */
1296
1297                         acpi_ds_clear_implicit_return(walk_state);
1298
1299                         /* Return statement has an immediate operand */
1300
1301                         status =
1302                             acpi_ds_create_operands(walk_state,
1303                                                     op->common.value.arg);
1304                         if (ACPI_FAILURE(status)) {
1305                                 return (status);
1306                         }
1307
1308                         /*
1309                          * If value being returned is a Reference (such as
1310                          * an arg or local), resolve it now because it may
1311                          * cease to exist at the end of the method.
1312                          */
1313                         status =
1314                             acpi_ex_resolve_to_value(&walk_state->operands[0],
1315                                                      walk_state);
1316                         if (ACPI_FAILURE(status)) {
1317                                 return (status);
1318                         }
1319
1320                         /*
1321                          * Get the return value and save as the last result
1322                          * value.  This is the only place where walk_state->return_desc
1323                          * is set to anything other than zero!
1324                          */
1325                         walk_state->return_desc = walk_state->operands[0];
1326                 } else if (walk_state->result_count) {
1327
1328                         /* Since we have a real Return(), delete any implicit return */
1329
1330                         acpi_ds_clear_implicit_return(walk_state);
1331
1332                         /*
1333                          * The return value has come from a previous calculation.
1334                          *
1335                          * If value being returned is a Reference (such as
1336                          * an arg or local), resolve it now because it may
1337                          * cease to exist at the end of the method.
1338                          *
1339                          * Allow references created by the Index operator to return unchanged.
1340                          */
1341                         if ((ACPI_GET_DESCRIPTOR_TYPE
1342                              (walk_state->results->results.obj_desc[0]) ==
1343                              ACPI_DESC_TYPE_OPERAND)
1344                             && ((walk_state->results->results.obj_desc[0])->
1345                                 common.type == ACPI_TYPE_LOCAL_REFERENCE)
1346                             && ((walk_state->results->results.obj_desc[0])->
1347                                 reference.class != ACPI_REFCLASS_INDEX)) {
1348                                 status =
1349                                     acpi_ex_resolve_to_value(&walk_state->
1350                                                              results->results.
1351                                                              obj_desc[0],
1352                                                              walk_state);
1353                                 if (ACPI_FAILURE(status)) {
1354                                         return (status);
1355                                 }
1356                         }
1357
1358                         walk_state->return_desc =
1359                             walk_state->results->results.obj_desc[0];
1360                 } else {
1361                         /* No return operand */
1362
1363                         if (walk_state->num_operands) {
1364                                 acpi_ut_remove_reference(walk_state->
1365                                                          operands[0]);
1366                         }
1367
1368                         walk_state->operands[0] = NULL;
1369                         walk_state->num_operands = 0;
1370                         walk_state->return_desc = NULL;
1371                 }
1372
1373                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1374                                   "Completed RETURN_OP State=%p, RetVal=%p\n",
1375                                   walk_state, walk_state->return_desc));
1376
1377                 /* End the control method execution right now */
1378
1379                 status = AE_CTRL_TERMINATE;
1380                 break;
1381
1382         case AML_NOOP_OP:
1383
1384                 /* Just do nothing! */
1385                 break;
1386
1387         case AML_BREAK_POINT_OP:
1388
1389                 /* Call up to the OS service layer to handle this */
1390
1391                 status =
1392                     acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
1393                                    "Executed AML Breakpoint opcode");
1394
1395                 /* If and when it returns, all done. */
1396
1397                 break;
1398
1399         case AML_BREAK_OP:
1400         case AML_CONTINUE_OP:   /* ACPI 2.0 */
1401
1402                 /* Pop and delete control states until we find a while */
1403
1404                 while (walk_state->control_state &&
1405                        (walk_state->control_state->control.opcode !=
1406                         AML_WHILE_OP)) {
1407                         control_state =
1408                             acpi_ut_pop_generic_state(&walk_state->
1409                                                       control_state);
1410                         acpi_ut_delete_generic_state(control_state);
1411                 }
1412
1413                 /* No while found? */
1414
1415                 if (!walk_state->control_state) {
1416                         return (AE_AML_NO_WHILE);
1417                 }
1418
1419                 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
1420
1421                 walk_state->aml_last_while =
1422                     walk_state->control_state->control.package_end;
1423
1424                 /* Return status depending on opcode */
1425
1426                 if (op->common.aml_opcode == AML_BREAK_OP) {
1427                         status = AE_CTRL_BREAK;
1428                 } else {
1429                         status = AE_CTRL_CONTINUE;
1430                 }
1431                 break;
1432
1433         default:
1434
1435                 ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p",
1436                             op->common.aml_opcode, op));
1437
1438                 status = AE_AML_BAD_OPCODE;
1439                 break;
1440         }
1441
1442         return (status);
1443 }