err.no Git - linux-2.6/blob - drivers/acpi/dispatcher/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 <acpi/acparser.h>
  47 #include <acpi/amlcode.h>
  48 #include <acpi/acdispat.h>
  49 #include <acpi/acinterp.h>
  50 #include <acpi/acnamesp.h>
  51 #include <acpi/acevents.h>
  52 #include <acpi/actables.h>
  53
  54 #define _COMPONENT          ACPI_DISPATCHER
  55 ACPI_MODULE_NAME("dsopcode")
  56
  57 /* Local prototypes */
  58 static acpi_status
  59 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
  60                           struct acpi_namespace_node *scope_node,
  61                           u32 aml_length, u8 * aml_start);
  62
  63 static acpi_status
  64 acpi_ds_init_buffer_field(u16 aml_opcode,
  65                           union acpi_operand_object *obj_desc,
  66                           union acpi_operand_object *buffer_desc,
  67                           union acpi_operand_object *offset_desc,
  68                           union acpi_operand_object *length_desc,
  69                           union acpi_operand_object *result_desc);
  70
  71 /*******************************************************************************
  72  *
  73  * FUNCTION:    acpi_ds_execute_arguments
  74  *
  75  * PARAMETERS:  Node                - Object NS node
  76  *              scope_node          - Parent NS node
  77  *              aml_length          - Length of executable AML
  78  *              aml_start           - Pointer to the AML
  79  *
  80  * RETURN:      Status.
  81  *
  82  * DESCRIPTION: Late (deferred) execution of region or field arguments
  83  *
  84  ******************************************************************************/
  85
  86 static acpi_status
  87 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
  88                           struct acpi_namespace_node *scope_node,
  89                           u32 aml_length, u8 * aml_start)
  90 {
  91         acpi_status status;
  92         union acpi_parse_object *op;
  93         struct acpi_walk_state *walk_state;
  94
  95         ACPI_FUNCTION_TRACE(ds_execute_arguments);
  96
  97         /*
  98          * Allocate a new parser op to be the root of the parsed tree
  99          */
 100         op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
 101         if (!op) {
 102                 return_ACPI_STATUS(AE_NO_MEMORY);
 103         }
 104
 105         /* Save the Node for use in acpi_ps_parse_aml */
 106
 107         op->common.node = scope_node;
 108
 109         /* Create and initialize a new parser state */
 110
 111         walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
 112         if (!walk_state) {
 113                 status = AE_NO_MEMORY;
 114                 goto cleanup;
 115         }
 116
 117         status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
 118                                        aml_length, NULL, ACPI_IMODE_LOAD_PASS1);
 119         if (ACPI_FAILURE(status)) {
 120                 acpi_ds_delete_walk_state(walk_state);
 121                 goto cleanup;
 122         }
 123
 124         /* Mark this parse as a deferred opcode */
 125
 126         walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP;
 127         walk_state->deferred_node = node;
 128
 129         /* Pass1: Parse the entire declaration */
 130
 131         status = acpi_ps_parse_aml(walk_state);
 132         if (ACPI_FAILURE(status)) {
 133                 goto cleanup;
 134         }
 135
 136         /* Get and init the Op created above */
 137
 138         op->common.node = node;
 139         acpi_ps_delete_parse_tree(op);
 140
 141         /* Evaluate the deferred arguments */
 142
 143         op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
 144         if (!op) {
 145                 return_ACPI_STATUS(AE_NO_MEMORY);
 146         }
 147
 148         op->common.node = scope_node;
 149
 150         /* Create and initialize a new parser state */
 151
 152         walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
 153         if (!walk_state) {
 154                 status = AE_NO_MEMORY;
 155                 goto cleanup;
 156         }
 157
 158         /* Execute the opcode and arguments */
 159
 160         status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
 161                                        aml_length, NULL, ACPI_IMODE_EXECUTE);
 162         if (ACPI_FAILURE(status)) {
 163                 acpi_ds_delete_walk_state(walk_state);
 164                 goto cleanup;
 165         }
 166
 167         /* Mark this execution as a deferred opcode */
 168
 169         walk_state->deferred_node = node;
 170         status = acpi_ps_parse_aml(walk_state);
 171
 172       cleanup:
 173         acpi_ps_delete_parse_tree(op);
 174         return_ACPI_STATUS(status);
 175 }
 176
 177 /*******************************************************************************
 178  *
 179  * FUNCTION:    acpi_ds_get_buffer_field_arguments
 180  *
 181  * PARAMETERS:  obj_desc        - A valid buffer_field object
 182  *
 183  * RETURN:      Status.
 184  *
 185  * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late
 186  *              evaluation of these field attributes.
 187  *
 188  ******************************************************************************/
 189
 190 acpi_status
 191 acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
 192 {
 193         union acpi_operand_object *extra_desc;
 194         struct acpi_namespace_node *node;
 195         acpi_status status;
 196
 197         ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_field_arguments, obj_desc);
 198
 199         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 200                 return_ACPI_STATUS(AE_OK);
 201         }
 202
 203         /* Get the AML pointer (method object) and buffer_field node */
 204
 205         extra_desc = acpi_ns_get_secondary_object(obj_desc);
 206         node = obj_desc->buffer_field.node;
 207
 208         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 209                         (ACPI_TYPE_BUFFER_FIELD, node, NULL));
 210         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BufferField Arg Init\n",
 211                           acpi_ut_get_node_name(node)));
 212
 213         /* Execute the AML code for the term_arg arguments */
 214
 215         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
 216                                            extra_desc->extra.aml_length,
 217                                            extra_desc->extra.aml_start);
 218         return_ACPI_STATUS(status);
 219 }
 220
 221 /*******************************************************************************
 222  *
 223  * FUNCTION:    acpi_ds_get_bank_field_arguments
 224  *
 225  * PARAMETERS:  obj_desc        - A valid bank_field object
 226  *
 227  * RETURN:      Status.
 228  *
 229  * DESCRIPTION: Get bank_field bank_value. This implements the late
 230  *              evaluation of these field attributes.
 231  *
 232  ******************************************************************************/
 233
 234 acpi_status
 235 acpi_ds_get_bank_field_arguments(union acpi_operand_object *obj_desc)
 236 {
 237         union acpi_operand_object *extra_desc;
 238         struct acpi_namespace_node *node;
 239         acpi_status status;
 240
 241         ACPI_FUNCTION_TRACE_PTR(ds_get_bank_field_arguments, obj_desc);
 242
 243         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 244                 return_ACPI_STATUS(AE_OK);
 245         }
 246
 247         /* Get the AML pointer (method object) and bank_field node */
 248
 249         extra_desc = acpi_ns_get_secondary_object(obj_desc);
 250         node = obj_desc->bank_field.node;
 251
 252         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 253                         (ACPI_TYPE_LOCAL_BANK_FIELD, node, NULL));
 254         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BankField Arg Init\n",
 255                           acpi_ut_get_node_name(node)));
 256
 257         /* Execute the AML code for the term_arg arguments */
 258
 259         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
 260                                            extra_desc->extra.aml_length,
 261                                            extra_desc->extra.aml_start);
 262         return_ACPI_STATUS(status);
 263 }
 264
 265 /*******************************************************************************
 266  *
 267  * FUNCTION:    acpi_ds_get_buffer_arguments
 268  *
 269  * PARAMETERS:  obj_desc        - A valid Buffer object
 270  *
 271  * RETURN:      Status.
 272  *
 273  * DESCRIPTION: Get Buffer length and initializer byte list.  This implements
 274  *              the late evaluation of these attributes.
 275  *
 276  ******************************************************************************/
 277
 278 acpi_status acpi_ds_get_buffer_arguments(union acpi_operand_object *obj_desc)
 279 {
 280         struct acpi_namespace_node *node;
 281         acpi_status status;
 282
 283         ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_arguments, obj_desc);
 284
 285         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 286                 return_ACPI_STATUS(AE_OK);
 287         }
 288
 289         /* Get the Buffer node */
 290
 291         node = obj_desc->buffer.node;
 292         if (!node) {
 293                 ACPI_ERROR((AE_INFO,
 294                             "No pointer back to NS node in buffer obj %p",
 295                             obj_desc));
 296                 return_ACPI_STATUS(AE_AML_INTERNAL);
 297         }
 298
 299         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n"));
 300
 301         /* Execute the AML code for the term_arg arguments */
 302
 303         status = acpi_ds_execute_arguments(node, node,
 304                                            obj_desc->buffer.aml_length,
 305                                            obj_desc->buffer.aml_start);
 306         return_ACPI_STATUS(status);
 307 }
 308
 309 /*******************************************************************************
 310  *
 311  * FUNCTION:    acpi_ds_get_package_arguments
 312  *
 313  * PARAMETERS:  obj_desc        - A valid Package object
 314  *
 315  * RETURN:      Status.
 316  *
 317  * DESCRIPTION: Get Package length and initializer byte list.  This implements
 318  *              the late evaluation of these attributes.
 319  *
 320  ******************************************************************************/
 321
 322 acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc)
 323 {
 324         struct acpi_namespace_node *node;
 325         acpi_status status;
 326
 327         ACPI_FUNCTION_TRACE_PTR(ds_get_package_arguments, obj_desc);
 328
 329         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 330                 return_ACPI_STATUS(AE_OK);
 331         }
 332
 333         /* Get the Package node */
 334
 335         node = obj_desc->package.node;
 336         if (!node) {
 337                 ACPI_ERROR((AE_INFO,
 338                             "No pointer back to NS node in package %p",
 339                             obj_desc));
 340                 return_ACPI_STATUS(AE_AML_INTERNAL);
 341         }
 342
 343         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n"));
 344
 345         /* Execute the AML code for the term_arg arguments */
 346
 347         status = acpi_ds_execute_arguments(node, node,
 348                                            obj_desc->package.aml_length,
 349                                            obj_desc->package.aml_start);
 350         return_ACPI_STATUS(status);
 351 }
 352
 353 /*****************************************************************************
 354  *
 355  * FUNCTION:    acpi_ds_get_region_arguments
 356  *
 357  * PARAMETERS:  obj_desc        - A valid region object
 358  *
 359  * RETURN:      Status.
 360  *
 361  * DESCRIPTION: Get region address and length.  This implements the late
 362  *              evaluation of these region attributes.
 363  *
 364  ****************************************************************************/
 365
 366 acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
 367 {
 368         struct acpi_namespace_node *node;
 369         acpi_status status;
 370         union acpi_operand_object *extra_desc;
 371
 372         ACPI_FUNCTION_TRACE_PTR(ds_get_region_arguments, obj_desc);
 373
 374         if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
 375                 return_ACPI_STATUS(AE_OK);
 376         }
 377
 378         extra_desc = acpi_ns_get_secondary_object(obj_desc);
 379         if (!extra_desc) {
 380                 return_ACPI_STATUS(AE_NOT_EXIST);
 381         }
 382
 383         /* Get the Region node */
 384
 385         node = obj_desc->region.node;
 386
 387         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 388                         (ACPI_TYPE_REGION, node, NULL));
 389
 390         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] OpRegion Arg Init at AML %p\n",
 391                           acpi_ut_get_node_name(node),
 392                           extra_desc->extra.aml_start));
 393
 394         /* Execute the argument AML */
 395
 396         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
 397                                            extra_desc->extra.aml_length,
 398                                            extra_desc->extra.aml_start);
 399         if (ACPI_FAILURE(status)) {
 400                 return_ACPI_STATUS(status);
 401         }
 402
 403         /* Validate the region address/length via the host OS */
 404
 405         status = acpi_os_validate_address(obj_desc->region.space_id,
 406                                           obj_desc->region.address,
 407                                           (acpi_size) obj_desc->region.length,
 408                                           acpi_ut_get_node_name(node));
 409
 410         if (ACPI_FAILURE(status)) {
 411                 /*
 412                  * Invalid address/length. We will emit an error message and mark
 413                  * the region as invalid, so that it will cause an additional error if
 414                  * it is ever used. Then return AE_OK.
 415                  */
 416                 ACPI_EXCEPTION((AE_INFO, status,
 417                                 "During address validation of OpRegion [%4.4s]",
 418                                 node->name.ascii));
 419                 obj_desc->common.flags |= AOPOBJ_INVALID;
 420                 status = AE_OK;
 421         }
 422
 423         return_ACPI_STATUS(status);
 424 }
 425
 426 /*******************************************************************************
 427  *
 428  * FUNCTION:    acpi_ds_initialize_region
 429  *
 430  * PARAMETERS:  obj_handle      - Region namespace node
 431  *
 432  * RETURN:      Status
 433  *
 434  * DESCRIPTION: Front end to ev_initialize_region
 435  *
 436  ******************************************************************************/
 437
 438 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
 439 {
 440         union acpi_operand_object *obj_desc;
 441         acpi_status status;
 442
 443         obj_desc = acpi_ns_get_attached_object(obj_handle);
 444
 445         /* Namespace is NOT locked */
 446
 447         status = acpi_ev_initialize_region(obj_desc, FALSE);
 448         return (status);
 449 }
 450
 451 /*******************************************************************************
 452  *
 453  * FUNCTION:    acpi_ds_init_buffer_field
 454  *
 455  * PARAMETERS:  aml_opcode      - create_xxx_field
 456  *              obj_desc        - buffer_field object
 457  *              buffer_desc     - Host Buffer
 458  *              offset_desc     - Offset into buffer
 459  *              length_desc     - Length of field (CREATE_FIELD_OP only)
 460  *              result_desc     - Where to store the result
 461  *
 462  * RETURN:      Status
 463  *
 464  * DESCRIPTION: Perform actual initialization of a buffer field
 465  *
 466  ******************************************************************************/
 467
 468 static acpi_status
 469 acpi_ds_init_buffer_field(u16 aml_opcode,
 470                           union acpi_operand_object *obj_desc,
 471                           union acpi_operand_object *buffer_desc,
 472                           union acpi_operand_object *offset_desc,
 473                           union acpi_operand_object *length_desc,
 474                           union acpi_operand_object *result_desc)
 475 {
 476         u32 offset;
 477         u32 bit_offset;
 478         u32 bit_count;
 479         u8 field_flags;
 480         acpi_status status;
 481
 482         ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
 483
 484         /* Host object must be a Buffer */
 485
 486         if (ACPI_GET_OBJECT_TYPE(buffer_desc) != ACPI_TYPE_BUFFER) {
 487                 ACPI_ERROR((AE_INFO,
 488                             "Target of Create Field is not a Buffer object - %s",
 489                             acpi_ut_get_object_type_name(buffer_desc)));
 490
 491                 status = AE_AML_OPERAND_TYPE;
 492                 goto cleanup;
 493         }
 494
 495         /*
 496          * The last parameter to all of these opcodes (result_desc) started
 497          * out as a name_string, and should therefore now be a NS node
 498          * after resolution in acpi_ex_resolve_operands().
 499          */
 500         if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
 501                 ACPI_ERROR((AE_INFO,
 502                             "(%s) destination not a NS Node [%s]",
 503                             acpi_ps_get_opcode_name(aml_opcode),
 504                             acpi_ut_get_descriptor_name(result_desc)));
 505
 506                 status = AE_AML_OPERAND_TYPE;
 507                 goto cleanup;
 508         }
 509
 510         offset = (u32) offset_desc->integer.value;
 511
 512         /*
 513          * Setup the Bit offsets and counts, according to the opcode
 514          */
 515         switch (aml_opcode) {
 516         case AML_CREATE_FIELD_OP:
 517
 518                 /* Offset is in bits, count is in bits */
 519
 520                 field_flags = AML_FIELD_ACCESS_BYTE;
 521                 bit_offset = offset;
 522                 bit_count = (u32) length_desc->integer.value;
 523
 524                 /* Must have a valid (>0) bit count */
 525
 526                 if (bit_count == 0) {
 527                         ACPI_ERROR((AE_INFO,
 528                                     "Attempt to CreateField of length zero"));
 529                         status = AE_AML_OPERAND_VALUE;
 530                         goto cleanup;
 531                 }
 532                 break;
 533
 534         case AML_CREATE_BIT_FIELD_OP:
 535
 536                 /* Offset is in bits, Field is one bit */
 537
 538                 bit_offset = offset;
 539                 bit_count = 1;
 540                 field_flags = AML_FIELD_ACCESS_BYTE;
 541                 break;
 542
 543         case AML_CREATE_BYTE_FIELD_OP:
 544
 545                 /* Offset is in bytes, field is one byte */
 546
 547                 bit_offset = 8 * offset;
 548                 bit_count = 8;
 549                 field_flags = AML_FIELD_ACCESS_BYTE;
 550                 break;
 551
 552         case AML_CREATE_WORD_FIELD_OP:
 553
 554                 /* Offset is in bytes, field is one word */
 555
 556                 bit_offset = 8 * offset;
 557                 bit_count = 16;
 558                 field_flags = AML_FIELD_ACCESS_WORD;
 559                 break;
 560
 561         case AML_CREATE_DWORD_FIELD_OP:
 562
 563                 /* Offset is in bytes, field is one dword */
 564
 565                 bit_offset = 8 * offset;
 566                 bit_count = 32;
 567                 field_flags = AML_FIELD_ACCESS_DWORD;
 568                 break;
 569
 570         case AML_CREATE_QWORD_FIELD_OP:
 571
 572                 /* Offset is in bytes, field is one qword */
 573
 574                 bit_offset = 8 * offset;
 575                 bit_count = 64;
 576                 field_flags = AML_FIELD_ACCESS_QWORD;
 577                 break;
 578
 579         default:
 580
 581                 ACPI_ERROR((AE_INFO,
 582                             "Unknown field creation opcode %02x", aml_opcode));
 583                 status = AE_AML_BAD_OPCODE;
 584                 goto cleanup;
 585         }
 586
 587         /* Entire field must fit within the current length of the buffer */
 588
 589         if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
 590                 ACPI_ERROR((AE_INFO,
 591                             "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)",
 592                             acpi_ut_get_node_name(result_desc),
 593                             bit_offset + bit_count,
 594                             acpi_ut_get_node_name(buffer_desc->buffer.node),
 595                             8 * (u32) buffer_desc->buffer.length));
 596                 status = AE_AML_BUFFER_LIMIT;
 597                 goto cleanup;
 598         }
 599
 600         /*
 601          * Initialize areas of the field object that are common to all fields
 602          * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
 603          * UPDATE_RULE = 0 (UPDATE_PRESERVE)
 604          */
 605         status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
 606                                                   bit_offset, bit_count);
 607         if (ACPI_FAILURE(status)) {
 608                 goto cleanup;
 609         }
 610
 611         obj_desc->buffer_field.buffer_obj = buffer_desc;
 612
 613         /* Reference count for buffer_desc inherits obj_desc count */
 614
 615         buffer_desc->common.reference_count = (u16)
 616             (buffer_desc->common.reference_count +
 617              obj_desc->common.reference_count);
 618
 619       cleanup:
 620
 621         /* Always delete the operands */
 622
 623         acpi_ut_remove_reference(offset_desc);
 624         acpi_ut_remove_reference(buffer_desc);
 625
 626         if (aml_opcode == AML_CREATE_FIELD_OP) {
 627                 acpi_ut_remove_reference(length_desc);
 628         }
 629
 630         /* On failure, delete the result descriptor */
 631
 632         if (ACPI_FAILURE(status)) {
 633                 acpi_ut_remove_reference(result_desc);  /* Result descriptor */
 634         } else {
 635                 /* Now the address and length are valid for this buffer_field */
 636
 637                 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
 638         }
 639
 640         return_ACPI_STATUS(status);
 641 }
 642
 643 /*******************************************************************************
 644  *
 645  * FUNCTION:    acpi_ds_eval_buffer_field_operands
 646  *
 647  * PARAMETERS:  walk_state      - Current walk
 648  *              Op              - A valid buffer_field Op object
 649  *
 650  * RETURN:      Status
 651  *
 652  * DESCRIPTION: Get buffer_field Buffer and Index
 653  *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 654  *
 655  ******************************************************************************/
 656
 657 acpi_status
 658 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
 659                                    union acpi_parse_object *op)
 660 {
 661         acpi_status status;
 662         union acpi_operand_object *obj_desc;
 663         struct acpi_namespace_node *node;
 664         union acpi_parse_object *next_op;
 665
 666         ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
 667
 668         /*
 669          * This is where we evaluate the address and length fields of the
 670          * create_xxx_field declaration
 671          */
 672         node = op->common.node;
 673
 674         /* next_op points to the op that holds the Buffer */
 675
 676         next_op = op->common.value.arg;
 677
 678         /* Evaluate/create the address and length operands */
 679
 680         status = acpi_ds_create_operands(walk_state, next_op);
 681         if (ACPI_FAILURE(status)) {
 682                 return_ACPI_STATUS(status);
 683         }
 684
 685         obj_desc = acpi_ns_get_attached_object(node);
 686         if (!obj_desc) {
 687                 return_ACPI_STATUS(AE_NOT_EXIST);
 688         }
 689
 690         /* Resolve the operands */
 691
 692         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 693                                           ACPI_WALK_OPERANDS, walk_state);
 694
 695         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
 696                            acpi_ps_get_opcode_name(op->common.aml_opcode),
 697                            walk_state->num_operands,
 698                            "after AcpiExResolveOperands");
 699
 700         if (ACPI_FAILURE(status)) {
 701                 ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)",
 702                             acpi_ps_get_opcode_name(op->common.aml_opcode),
 703                             status));
 704
 705                 return_ACPI_STATUS(status);
 706         }
 707
 708         /* Initialize the Buffer Field */
 709
 710         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 711
 712                 /* NOTE: Slightly different operands for this opcode */
 713
 714                 status =
 715                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 716                                               walk_state->operands[0],
 717                                               walk_state->operands[1],
 718                                               walk_state->operands[2],
 719                                               walk_state->operands[3]);
 720         } else {
 721                 /* All other, create_xxx_field opcodes */
 722
 723                 status =
 724                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 725                                               walk_state->operands[0],
 726                                               walk_state->operands[1], NULL,
 727                                               walk_state->operands[2]);
 728         }
 729
 730         return_ACPI_STATUS(status);
 731 }
 732
 733 /*******************************************************************************
 734  *
 735  * FUNCTION:    acpi_ds_eval_region_operands
 736  *
 737  * PARAMETERS:  walk_state      - Current walk
 738  *              Op              - A valid region Op object
 739  *
 740  * RETURN:      Status
 741  *
 742  * DESCRIPTION: Get region address and length
 743  *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 744  *
 745  ******************************************************************************/
 746
 747 acpi_status
 748 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
 749                              union acpi_parse_object *op)
 750 {
 751         acpi_status status;
 752         union acpi_operand_object *obj_desc;
 753         union acpi_operand_object *operand_desc;
 754         struct acpi_namespace_node *node;
 755         union acpi_parse_object *next_op;
 756
 757         ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
 758
 759         /*
 760          * This is where we evaluate the address and length fields of the
 761          * op_region declaration
 762          */
 763         node = op->common.node;
 764
 765         /* next_op points to the op that holds the space_iD */
 766
 767         next_op = op->common.value.arg;
 768
 769         /* next_op points to address op */
 770
 771         next_op = next_op->common.next;
 772
 773         /* Evaluate/create the address and length operands */
 774
 775         status = acpi_ds_create_operands(walk_state, next_op);
 776         if (ACPI_FAILURE(status)) {
 777                 return_ACPI_STATUS(status);
 778         }
 779
 780         /* Resolve the length and address operands to numbers */
 781
 782         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 783                                           ACPI_WALK_OPERANDS, walk_state);
 784         if (ACPI_FAILURE(status)) {
 785                 return_ACPI_STATUS(status);
 786         }
 787
 788         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
 789                            acpi_ps_get_opcode_name(op->common.aml_opcode),
 790                            1, "after AcpiExResolveOperands");
 791
 792         obj_desc = acpi_ns_get_attached_object(node);
 793         if (!obj_desc) {
 794                 return_ACPI_STATUS(AE_NOT_EXIST);
 795         }
 796
 797         /*
 798          * Get the length operand and save it
 799          * (at Top of stack)
 800          */
 801         operand_desc = walk_state->operands[walk_state->num_operands - 1];
 802
 803         obj_desc->region.length = (u32) operand_desc->integer.value;
 804         acpi_ut_remove_reference(operand_desc);
 805
 806         /*
 807          * Get the address and save it
 808          * (at top of stack - 1)
 809          */
 810         operand_desc = walk_state->operands[walk_state->num_operands - 2];
 811
 812         obj_desc->region.address = (acpi_physical_address)
 813             operand_desc->integer.value;
 814         acpi_ut_remove_reference(operand_desc);
 815
 816         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 817                           obj_desc,
 818                           ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
 819                           obj_desc->region.length));
 820
 821         /* Now the address and length are valid for this opregion */
 822
 823         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 824
 825         return_ACPI_STATUS(status);
 826 }
 827
 828 /*******************************************************************************
 829  *
 830  * FUNCTION:    acpi_ds_eval_table_region_operands
 831  *
 832  * PARAMETERS:  walk_state      - Current walk
 833  *              Op              - A valid region Op object
 834  *
 835  * RETURN:      Status
 836  *
 837  * DESCRIPTION: Get region address and length
 838  *              Called from acpi_ds_exec_end_op during data_table_region parse tree walk
 839  *
 840  ******************************************************************************/
 841
 842 acpi_status
 843 acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 844                                    union acpi_parse_object *op)
 845 {
 846         acpi_status status;
 847         union acpi_operand_object *obj_desc;
 848         union acpi_operand_object **operand;
 849         struct acpi_namespace_node *node;
 850         union acpi_parse_object *next_op;
 851         acpi_native_uint table_index;
 852         struct acpi_table_header *table;
 853
 854         ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
 855
 856         /*
 857          * This is where we evaluate the signature_string and oem_iDString
 858          * and oem_table_iDString of the data_table_region declaration
 859          */
 860         node = op->common.node;
 861
 862         /* next_op points to signature_string op */
 863
 864         next_op = op->common.value.arg;
 865
 866         /*
 867          * Evaluate/create the signature_string and oem_iDString
 868          * and oem_table_iDString operands
 869          */
 870         status = acpi_ds_create_operands(walk_state, next_op);
 871         if (ACPI_FAILURE(status)) {
 872                 return_ACPI_STATUS(status);
 873         }
 874
 875         /*
 876          * Resolve the signature_string and oem_iDString
 877          * and oem_table_iDString operands
 878          */
 879         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 880                                           ACPI_WALK_OPERANDS, walk_state);
 881         if (ACPI_FAILURE(status)) {
 882                 return_ACPI_STATUS(status);
 883         }
 884
 885         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
 886                            acpi_ps_get_opcode_name(op->common.aml_opcode),
 887                            1, "after AcpiExResolveOperands");
 888
 889         operand = &walk_state->operands[0];
 890
 891         /* Find the ACPI table */
 892
 893         status = acpi_tb_find_table(operand[0]->string.pointer,
 894                                     operand[1]->string.pointer,
 895                                     operand[2]->string.pointer, &table_index);
 896         if (ACPI_FAILURE(status)) {
 897                 return_ACPI_STATUS(status);
 898         }
 899
 900         acpi_ut_remove_reference(operand[0]);
 901         acpi_ut_remove_reference(operand[1]);
 902         acpi_ut_remove_reference(operand[2]);
 903
 904         status = acpi_get_table_by_index(table_index, &table);
 905         if (ACPI_FAILURE(status)) {
 906                 return_ACPI_STATUS(status);
 907         }
 908
 909         obj_desc = acpi_ns_get_attached_object(node);
 910         if (!obj_desc) {
 911                 return_ACPI_STATUS(AE_NOT_EXIST);
 912         }
 913
 914         obj_desc->region.address =
 915             (acpi_physical_address) ACPI_TO_INTEGER(table);
 916         obj_desc->region.length = table->length;
 917
 918         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 919                           obj_desc,
 920                           ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
 921                           obj_desc->region.length));
 922
 923         /* Now the address and length are valid for this opregion */
 924
 925         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 926
 927         return_ACPI_STATUS(status);
 928 }
 929
 930 /*******************************************************************************
 931  *
 932  * FUNCTION:    acpi_ds_eval_data_object_operands
 933  *
 934  * PARAMETERS:  walk_state      - Current walk
 935  *              Op              - A valid data_object Op object
 936  *              obj_desc        - data_object
 937  *
 938  * RETURN:      Status
 939  *
 940  * DESCRIPTION: Get the operands and complete the following data object types:
 941  *              Buffer, Package.
 942  *
 943  ******************************************************************************/
 944
 945 acpi_status
 946 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 947                                   union acpi_parse_object *op,
 948                                   union acpi_operand_object *obj_desc)
 949 {
 950         acpi_status status;
 951         union acpi_operand_object *arg_desc;
 952         u32 length;
 953
 954         ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
 955
 956         /* The first operand (for all of these data objects) is the length */
 957
 958         /*
 959          * Set proper index into operand stack for acpi_ds_obj_stack_push
 960          * invoked inside acpi_ds_create_operand.
 961          */
 962         walk_state->operand_index = walk_state->num_operands;
 963
 964         status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 965         if (ACPI_FAILURE(status)) {
 966                 return_ACPI_STATUS(status);
 967         }
 968
 969         status = acpi_ex_resolve_operands(walk_state->opcode,
 970                                           &(walk_state->
 971                                             operands[walk_state->num_operands -
 972                                                      1]), walk_state);
 973         if (ACPI_FAILURE(status)) {
 974                 return_ACPI_STATUS(status);
 975         }
 976
 977         /* Extract length operand */
 978
 979         arg_desc = walk_state->operands[walk_state->num_operands - 1];
 980         length = (u32) arg_desc->integer.value;
 981
 982         /* Cleanup for length operand */
 983
 984         status = acpi_ds_obj_stack_pop(1, walk_state);
 985         if (ACPI_FAILURE(status)) {
 986                 return_ACPI_STATUS(status);
 987         }
 988
 989         acpi_ut_remove_reference(arg_desc);
 990
 991         /*
 992          * Create the actual data object
 993          */
 994         switch (op->common.aml_opcode) {
 995         case AML_BUFFER_OP:
 996
 997                 status =
 998                     acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 999                                                       &obj_desc);
1000                 break;
1001
1002         case AML_PACKAGE_OP:
1003         case AML_VAR_PACKAGE_OP:
1004
1005                 status =
1006                     acpi_ds_build_internal_package_obj(walk_state, op, length,
1007                                                        &obj_desc);
1008                 break;
1009
1010         default:
1011                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
1012         }
1013
1014         if (ACPI_SUCCESS(status)) {
1015                 /*
1016                  * Return the object in the walk_state, unless the parent is a package -
1017                  * in this case, the return object will be stored in the parse tree
1018                  * for the package.
1019                  */
1020                 if ((!op->common.parent) ||
1021                     ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
1022                      (op->common.parent->common.aml_opcode !=
1023                       AML_VAR_PACKAGE_OP)
1024                      && (op->common.parent->common.aml_opcode != AML_NAME_OP))) {
1025                         walk_state->result_obj = obj_desc;
1026                 }
1027         }
1028
1029         return_ACPI_STATUS(status);
1030 }
1031
1032 /*******************************************************************************
1033  *
1034  * FUNCTION:    acpi_ds_eval_bank_field_operands
1035  *
1036  * PARAMETERS:  walk_state      - Current walk
1037  *              Op              - A valid bank_field Op object
1038  *
1039  * RETURN:      Status
1040  *
1041  * DESCRIPTION: Get bank_field bank_value
1042  *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
1043  *
1044  ******************************************************************************/
1045
1046 acpi_status
1047 acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
1048                                  union acpi_parse_object *op)
1049 {
1050         acpi_status status;
1051         union acpi_operand_object *obj_desc;
1052         union acpi_operand_object *operand_desc;
1053         struct acpi_namespace_node *node;
1054         union acpi_parse_object *next_op;
1055         union acpi_parse_object *arg;
1056
1057         ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
1058
1059         /*
1060          * This is where we evaluate the bank_value field of the
1061          * bank_field declaration
1062          */
1063
1064         /* next_op points to the op that holds the Region */
1065
1066         next_op = op->common.value.arg;
1067
1068         /* next_op points to the op that holds the Bank Register */
1069
1070         next_op = next_op->common.next;
1071
1072         /* next_op points to the op that holds the Bank Value */
1073
1074         next_op = next_op->common.next;
1075
1076         /*
1077          * Set proper index into operand stack for acpi_ds_obj_stack_push
1078          * invoked inside acpi_ds_create_operand.
1079          *
1080          * We use walk_state->Operands[0] to store the evaluated bank_value
1081          */
1082         walk_state->operand_index = 0;
1083
1084         status = acpi_ds_create_operand(walk_state, next_op, 0);
1085         if (ACPI_FAILURE(status)) {
1086                 return_ACPI_STATUS(status);
1087         }
1088
1089         status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
1090         if (ACPI_FAILURE(status)) {
1091                 return_ACPI_STATUS(status);
1092         }
1093
1094         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
1095                            acpi_ps_get_opcode_name(op->common.aml_opcode),
1096                            1, "after AcpiExResolveOperands");
1097
1098         /*
1099          * Get the bank_value operand and save it
1100          * (at Top of stack)
1101          */
1102         operand_desc = walk_state->operands[0];
1103
1104         /* Arg points to the start Bank Field */
1105
1106         arg = acpi_ps_get_arg(op, 4);
1107         while (arg) {
1108
1109                 /* Ignore OFFSET and ACCESSAS terms here */
1110
1111                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
1112                         node = arg->common.node;
1113
1114                         obj_desc = acpi_ns_get_attached_object(node);
1115                         if (!obj_desc) {
1116                                 return_ACPI_STATUS(AE_NOT_EXIST);
1117                         }
1118
1119                         obj_desc->bank_field.value =
1120                             (u32) operand_desc->integer.value;
1121                 }
1122
1123                 /* Move to next field in the list */
1124
1125                 arg = arg->common.next;
1126         }
1127
1128         acpi_ut_remove_reference(operand_desc);
1129         return_ACPI_STATUS(status);
1130 }
1131
1132 /*******************************************************************************
1133  *
1134  * FUNCTION:    acpi_ds_exec_begin_control_op
1135  *
1136  * PARAMETERS:  walk_list       - The list that owns the walk stack
1137  *              Op              - The control Op
1138  *
1139  * RETURN:      Status
1140  *
1141  * DESCRIPTION: Handles all control ops encountered during control method
1142  *              execution.
1143  *
1144  ******************************************************************************/
1145
1146 acpi_status
1147 acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
1148                               union acpi_parse_object *op)
1149 {
1150         acpi_status status = AE_OK;
1151         union acpi_generic_state *control_state;
1152
1153         ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
1154
1155         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
1156                           op->common.aml_opcode, walk_state));
1157
1158         switch (op->common.aml_opcode) {
1159         case AML_IF_OP:
1160         case AML_WHILE_OP:
1161
1162                 /*
1163                  * IF/WHILE: Create a new control state to manage these
1164                  * constructs. We need to manage these as a stack, in order
1165                  * to handle nesting.
1166                  */
1167                 control_state = acpi_ut_create_control_state();
1168                 if (!control_state) {
1169                         status = AE_NO_MEMORY;
1170                         break;
1171                 }
1172                 /*
1173                  * Save a pointer to the predicate for multiple executions
1174                  * of a loop
1175                  */
1176                 control_state->control.aml_predicate_start =
1177                     walk_state->parser_state.aml - 1;
1178                 control_state->control.package_end =
1179                     walk_state->parser_state.pkg_end;
1180                 control_state->control.opcode = op->common.aml_opcode;
1181
1182                 /* Push the control state on this walk's control stack */
1183
1184                 acpi_ut_push_generic_state(&walk_state->control_state,
1185                                            control_state);
1186                 break;
1187
1188         case AML_ELSE_OP:
1189
1190                 /* Predicate is in the state object */
1191                 /* If predicate is true, the IF was executed, ignore ELSE part */
1192
1193                 if (walk_state->last_predicate) {
1194                         status = AE_CTRL_TRUE;
1195                 }
1196
1197                 break;
1198
1199         case AML_RETURN_OP:
1200
1201                 break;
1202
1203         default:
1204                 break;
1205         }
1206
1207         return (status);
1208 }
1209
1210 /*******************************************************************************
1211  *
1212  * FUNCTION:    acpi_ds_exec_end_control_op
1213  *
1214  * PARAMETERS:  walk_list       - The list that owns the walk stack
1215  *              Op              - The control Op
1216  *
1217  * RETURN:      Status
1218  *
1219  * DESCRIPTION: Handles all control ops encountered during control method
1220  *              execution.
1221  *
1222  ******************************************************************************/
1223
1224 acpi_status
1225 acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
1226                             union acpi_parse_object * op)
1227 {
1228         acpi_status status = AE_OK;
1229         union acpi_generic_state *control_state;
1230
1231         ACPI_FUNCTION_NAME(ds_exec_end_control_op);
1232
1233         switch (op->common.aml_opcode) {
1234         case AML_IF_OP:
1235
1236                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
1237
1238                 /*
1239                  * Save the result of the predicate in case there is an
1240                  * ELSE to come
1241                  */
1242                 walk_state->last_predicate =
1243                     (u8) walk_state->control_state->common.value;
1244
1245                 /*
1246                  * Pop the control state that was created at the start
1247                  * of the IF and free it
1248                  */
1249                 control_state =
1250                     acpi_ut_pop_generic_state(&walk_state->control_state);
1251                 acpi_ut_delete_generic_state(control_state);
1252                 break;
1253
1254         case AML_ELSE_OP:
1255
1256                 break;
1257
1258         case AML_WHILE_OP:
1259
1260                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
1261
1262                 if (walk_state->control_state->common.value) {
1263
1264                         /* Predicate was true, go back and evaluate it again! */
1265
1266                         status = AE_CTRL_PENDING;
1267                 }
1268
1269                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1270                                   "[WHILE_OP] termination! Op=%p\n", op));
1271
1272                 /* Pop this control state and free it */
1273
1274                 control_state =
1275                     acpi_ut_pop_generic_state(&walk_state->control_state);
1276
1277                 walk_state->aml_last_while =
1278                     control_state->control.aml_predicate_start;
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                             &&
1345                             (ACPI_GET_OBJECT_TYPE
1346                              (walk_state->results->results.obj_desc[0]) ==
1347                              ACPI_TYPE_LOCAL_REFERENCE)
1348                             && ((walk_state->results->results.obj_desc[0])->
1349                                 reference.opcode != AML_INDEX_OP)) {
1350                                 status =
1351                                     acpi_ex_resolve_to_value(&walk_state->
1352                                                              results->results.
1353                                                              obj_desc[0],
1354                                                              walk_state);
1355                                 if (ACPI_FAILURE(status)) {
1356                                         return (status);
1357                                 }
1358                         }
1359
1360                         walk_state->return_desc =
1361                             walk_state->results->results.obj_desc[0];
1362                 } else {
1363                         /* No return operand */
1364
1365                         if (walk_state->num_operands) {
1366                                 acpi_ut_remove_reference(walk_state->
1367                                                          operands[0]);
1368                         }
1369
1370                         walk_state->operands[0] = NULL;
1371                         walk_state->num_operands = 0;
1372                         walk_state->return_desc = NULL;
1373                 }
1374
1375                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1376                                   "Completed RETURN_OP State=%p, RetVal=%p\n",
1377                                   walk_state, walk_state->return_desc));
1378
1379                 /* End the control method execution right now */
1380
1381                 status = AE_CTRL_TERMINATE;
1382                 break;
1383
1384         case AML_NOOP_OP:
1385
1386                 /* Just do nothing! */
1387                 break;
1388
1389         case AML_BREAK_POINT_OP:
1390
1391                 /* Call up to the OS service layer to handle this */
1392
1393                 status =
1394                     acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
1395                                    "Executed AML Breakpoint opcode");
1396
1397                 /* If and when it returns, all done. */
1398
1399                 break;
1400
1401         case AML_BREAK_OP:
1402         case AML_CONTINUE_OP:   /* ACPI 2.0 */
1403
1404                 /* Pop and delete control states until we find a while */
1405
1406                 while (walk_state->control_state &&
1407                        (walk_state->control_state->control.opcode !=
1408                         AML_WHILE_OP)) {
1409                         control_state =
1410                             acpi_ut_pop_generic_state(&walk_state->
1411                                                       control_state);
1412                         acpi_ut_delete_generic_state(control_state);
1413                 }
1414
1415                 /* No while found? */
1416
1417                 if (!walk_state->control_state) {
1418                         return (AE_AML_NO_WHILE);
1419                 }
1420
1421                 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
1422
1423                 walk_state->aml_last_while =
1424                     walk_state->control_state->control.package_end;
1425
1426                 /* Return status depending on opcode */
1427
1428                 if (op->common.aml_opcode == AML_BREAK_OP) {
1429                         status = AE_CTRL_BREAK;
1430                 } else {
1431                         status = AE_CTRL_CONTINUE;
1432                 }
1433                 break;
1434
1435         default:
1436
1437                 ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p",
1438                             op->common.aml_opcode, op));
1439
1440                 status = AE_AML_BAD_OPCODE;
1441                 break;
1442         }
1443
1444         return (status);
1445 }