drivers/acpi/acpica/dsopcode.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsopcode - Dispatcher support for regions and fields
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48 #include "acdispat.h"
  49 #include "acinterp.h"
  50 #include "acnamesp.h"
  51 #include "acevents.h"
  52 #include "actables.h"
  53
  54 #define _COMPONENT          ACPI_DISPATCHER
  55 ACPI_MODULE_NAME("dsopcode")
  56
  57 /* Local prototypes */
  58 static acpi_status
  59 acpi_ds_init_buffer_field(u16 aml_opcode,
  60                           union acpi_operand_object *obj_desc,
  61                           union acpi_operand_object *buffer_desc,
  62                           union acpi_operand_object *offset_desc,
  63                           union acpi_operand_object *length_desc,
  64                           union acpi_operand_object *result_desc);
  65
  66 /*******************************************************************************
  67  *
  68  * FUNCTION:    acpi_ds_initialize_region
  69  *
  70  * PARAMETERS:  obj_handle      - Region namespace node
  71  *
  72  * RETURN:      Status
  73  *
  74  * DESCRIPTION: Front end to ev_initialize_region
  75  *
  76  ******************************************************************************/
  77
  78 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
  79 {
  80         union acpi_operand_object *obj_desc;
  81         acpi_status status;
  82
  83         obj_desc = acpi_ns_get_attached_object(obj_handle);
  84
  85         /* Namespace is NOT locked */
  86
  87         status = acpi_ev_initialize_region(obj_desc);
  88         return (status);
  89 }
  90
  91 /*******************************************************************************
  92  *
  93  * FUNCTION:    acpi_ds_init_buffer_field
  94  *
  95  * PARAMETERS:  aml_opcode      - create_xxx_field
  96  *              obj_desc        - buffer_field object
  97  *              buffer_desc     - Host Buffer
  98  *              offset_desc     - Offset into buffer
  99  *              length_desc     - Length of field (CREATE_FIELD_OP only)
 100  *              result_desc     - Where to store the result
 101  *
 102  * RETURN:      Status
 103  *
 104  * DESCRIPTION: Perform actual initialization of a buffer field
 105  *
 106  ******************************************************************************/
 107
 108 static acpi_status
 109 acpi_ds_init_buffer_field(u16 aml_opcode,
 110                           union acpi_operand_object *obj_desc,
 111                           union acpi_operand_object *buffer_desc,
 112                           union acpi_operand_object *offset_desc,
 113                           union acpi_operand_object *length_desc,
 114                           union acpi_operand_object *result_desc)
 115 {
 116         u32 offset;
 117         u32 bit_offset;
 118         u32 bit_count;
 119         u8 field_flags;
 120         acpi_status status;
 121
 122         ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
 123
 124         /* Host object must be a Buffer */
 125
 126         if (buffer_desc->common.type != ACPI_TYPE_BUFFER) {
 127                 ACPI_ERROR((AE_INFO,
 128                             "Target of Create Field is not a Buffer object - %s",
 129                             acpi_ut_get_object_type_name(buffer_desc)));
 130
 131                 status = AE_AML_OPERAND_TYPE;
 132                 goto cleanup;
 133         }
 134
 135         /*
 136          * The last parameter to all of these opcodes (result_desc) started
 137          * out as a name_string, and should therefore now be a NS node
 138          * after resolution in acpi_ex_resolve_operands().
 139          */
 140         if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
 141                 ACPI_ERROR((AE_INFO,
 142                             "(%s) destination not a NS Node [%s]",
 143                             acpi_ps_get_opcode_name(aml_opcode),
 144                             acpi_ut_get_descriptor_name(result_desc)));
 145
 146                 status = AE_AML_OPERAND_TYPE;
 147                 goto cleanup;
 148         }
 149
 150         offset = (u32) offset_desc->integer.value;
 151
 152         /*
 153          * Setup the Bit offsets and counts, according to the opcode
 154          */
 155         switch (aml_opcode) {
 156         case AML_CREATE_FIELD_OP:
 157
 158                 /* Offset is in bits, count is in bits */
 159
 160                 field_flags = AML_FIELD_ACCESS_BYTE;
 161                 bit_offset = offset;
 162                 bit_count = (u32) length_desc->integer.value;
 163
 164                 /* Must have a valid (>0) bit count */
 165
 166                 if (bit_count == 0) {
 167                         ACPI_ERROR((AE_INFO,
 168                                     "Attempt to CreateField of length zero"));
 169                         status = AE_AML_OPERAND_VALUE;
 170                         goto cleanup;
 171                 }
 172                 break;
 173
 174         case AML_CREATE_BIT_FIELD_OP:
 175
 176                 /* Offset is in bits, Field is one bit */
 177
 178                 bit_offset = offset;
 179                 bit_count = 1;
 180                 field_flags = AML_FIELD_ACCESS_BYTE;
 181                 break;
 182
 183         case AML_CREATE_BYTE_FIELD_OP:
 184
 185                 /* Offset is in bytes, field is one byte */
 186
 187                 bit_offset = 8 * offset;
 188                 bit_count = 8;
 189                 field_flags = AML_FIELD_ACCESS_BYTE;
 190                 break;
 191
 192         case AML_CREATE_WORD_FIELD_OP:
 193
 194                 /* Offset is in bytes, field is one word */
 195
 196                 bit_offset = 8 * offset;
 197                 bit_count = 16;
 198                 field_flags = AML_FIELD_ACCESS_WORD;
 199                 break;
 200
 201         case AML_CREATE_DWORD_FIELD_OP:
 202
 203                 /* Offset is in bytes, field is one dword */
 204
 205                 bit_offset = 8 * offset;
 206                 bit_count = 32;
 207                 field_flags = AML_FIELD_ACCESS_DWORD;
 208                 break;
 209
 210         case AML_CREATE_QWORD_FIELD_OP:
 211
 212                 /* Offset is in bytes, field is one qword */
 213
 214                 bit_offset = 8 * offset;
 215                 bit_count = 64;
 216                 field_flags = AML_FIELD_ACCESS_QWORD;
 217                 break;
 218
 219         default:
 220
 221                 ACPI_ERROR((AE_INFO,
 222                             "Unknown field creation opcode 0x%02X",
 223                             aml_opcode));
 224                 status = AE_AML_BAD_OPCODE;
 225                 goto cleanup;
 226         }
 227
 228         /* Entire field must fit within the current length of the buffer */
 229
 230         if ((bit_offset + bit_count) > (8 * (u32)buffer_desc->buffer.length)) {
 231                 ACPI_ERROR((AE_INFO,
 232                             "Field [%4.4s] at bit offset/length %u/%u "
 233                             "exceeds size of target Buffer (%u bits)",
 234                             acpi_ut_get_node_name(result_desc), bit_offset,
 235                             bit_count, 8 * (u32)buffer_desc->buffer.length));
 236                 status = AE_AML_BUFFER_LIMIT;
 237                 goto cleanup;
 238         }
 239
 240         /*
 241          * Initialize areas of the field object that are common to all fields
 242          * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
 243          * UPDATE_RULE = 0 (UPDATE_PRESERVE)
 244          */
 245         status =
 246             acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
 247                                              bit_offset, bit_count);
 248         if (ACPI_FAILURE(status)) {
 249                 goto cleanup;
 250         }
 251
 252         obj_desc->buffer_field.buffer_obj = buffer_desc;
 253
 254         /* Reference count for buffer_desc inherits obj_desc count */
 255
 256         buffer_desc->common.reference_count = (u16)
 257             (buffer_desc->common.reference_count +
 258              obj_desc->common.reference_count);
 259
 260 cleanup:
 261
 262         /* Always delete the operands */
 263
 264         acpi_ut_remove_reference(offset_desc);
 265         acpi_ut_remove_reference(buffer_desc);
 266
 267         if (aml_opcode == AML_CREATE_FIELD_OP) {
 268                 acpi_ut_remove_reference(length_desc);
 269         }
 270
 271         /* On failure, delete the result descriptor */
 272
 273         if (ACPI_FAILURE(status)) {
 274                 acpi_ut_remove_reference(result_desc);  /* Result descriptor */
 275         } else {
 276                 /* Now the address and length are valid for this buffer_field */
 277
 278                 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
 279         }
 280
 281         return_ACPI_STATUS(status);
 282 }
 283
 284 /*******************************************************************************
 285  *
 286  * FUNCTION:    acpi_ds_eval_buffer_field_operands
 287  *
 288  * PARAMETERS:  walk_state      - Current walk
 289  *              op              - A valid buffer_field Op object
 290  *
 291  * RETURN:      Status
 292  *
 293  * DESCRIPTION: Get buffer_field Buffer and Index
 294  *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 295  *
 296  ******************************************************************************/
 297
 298 acpi_status
 299 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
 300                                    union acpi_parse_object *op)
 301 {
 302         acpi_status status;
 303         union acpi_operand_object *obj_desc;
 304         struct acpi_namespace_node *node;
 305         union acpi_parse_object *next_op;
 306
 307         ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
 308
 309         /*
 310          * This is where we evaluate the address and length fields of the
 311          * create_xxx_field declaration
 312          */
 313         node = op->common.node;
 314
 315         /* next_op points to the op that holds the Buffer */
 316
 317         next_op = op->common.value.arg;
 318
 319         /* Evaluate/create the address and length operands */
 320
 321         status = acpi_ds_create_operands(walk_state, next_op);
 322         if (ACPI_FAILURE(status)) {
 323                 return_ACPI_STATUS(status);
 324         }
 325
 326         obj_desc = acpi_ns_get_attached_object(node);
 327         if (!obj_desc) {
 328                 return_ACPI_STATUS(AE_NOT_EXIST);
 329         }
 330
 331         /* Resolve the operands */
 332
 333         status =
 334             acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 335                                      walk_state);
 336         if (ACPI_FAILURE(status)) {
 337                 ACPI_ERROR((AE_INFO, "(%s) bad operand(s), status 0x%X",
 338                             acpi_ps_get_opcode_name(op->common.aml_opcode),
 339                             status));
 340
 341                 return_ACPI_STATUS(status);
 342         }
 343
 344         /* Initialize the Buffer Field */
 345
 346         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 347
 348                 /* NOTE: Slightly different operands for this opcode */
 349
 350                 status =
 351                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 352                                               walk_state->operands[0],
 353                                               walk_state->operands[1],
 354                                               walk_state->operands[2],
 355                                               walk_state->operands[3]);
 356         } else {
 357                 /* All other, create_xxx_field opcodes */
 358
 359                 status =
 360                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 361                                               walk_state->operands[0],
 362                                               walk_state->operands[1], NULL,
 363                                               walk_state->operands[2]);
 364         }
 365
 366         return_ACPI_STATUS(status);
 367 }
 368
 369 /*******************************************************************************
 370  *
 371  * FUNCTION:    acpi_ds_eval_region_operands
 372  *
 373  * PARAMETERS:  walk_state      - Current walk
 374  *              op              - A valid region Op object
 375  *
 376  * RETURN:      Status
 377  *
 378  * DESCRIPTION: Get region address and length
 379  *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 380  *
 381  ******************************************************************************/
 382
 383 acpi_status
 384 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
 385                              union acpi_parse_object *op)
 386 {
 387         acpi_status status;
 388         union acpi_operand_object *obj_desc;
 389         union acpi_operand_object *operand_desc;
 390         struct acpi_namespace_node *node;
 391         union acpi_parse_object *next_op;
 392
 393         ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
 394
 395         /*
 396          * This is where we evaluate the address and length fields of the
 397          * op_region declaration
 398          */
 399         node = op->common.node;
 400
 401         /* next_op points to the op that holds the space_ID */
 402
 403         next_op = op->common.value.arg;
 404
 405         /* next_op points to address op */
 406
 407         next_op = next_op->common.next;
 408
 409         /* Evaluate/create the address and length operands */
 410
 411         status = acpi_ds_create_operands(walk_state, next_op);
 412         if (ACPI_FAILURE(status)) {
 413                 return_ACPI_STATUS(status);
 414         }
 415
 416         /* Resolve the length and address operands to numbers */
 417
 418         status =
 419             acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 420                                      walk_state);
 421         if (ACPI_FAILURE(status)) {
 422                 return_ACPI_STATUS(status);
 423         }
 424
 425         obj_desc = acpi_ns_get_attached_object(node);
 426         if (!obj_desc) {
 427                 return_ACPI_STATUS(AE_NOT_EXIST);
 428         }
 429
 430         /*
 431          * Get the length operand and save it
 432          * (at Top of stack)
 433          */
 434         operand_desc = walk_state->operands[walk_state->num_operands - 1];
 435
 436         obj_desc->region.length = (u32) operand_desc->integer.value;
 437         acpi_ut_remove_reference(operand_desc);
 438
 439         /*
 440          * Get the address and save it
 441          * (at top of stack - 1)
 442          */
 443         operand_desc = walk_state->operands[walk_state->num_operands - 2];
 444
 445         obj_desc->region.address = (acpi_physical_address)
 446             operand_desc->integer.value;
 447         acpi_ut_remove_reference(operand_desc);
 448
 449         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 450                           obj_desc,
 451                           ACPI_FORMAT_UINT64(obj_desc->region.address),
 452                           obj_desc->region.length));
 453
 454         /* Now the address and length are valid for this opregion */
 455
 456         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 457         return_ACPI_STATUS(status);
 458 }
 459
 460 /*******************************************************************************
 461  *
 462  * FUNCTION:    acpi_ds_eval_table_region_operands
 463  *
 464  * PARAMETERS:  walk_state      - Current walk
 465  *              op              - A valid region Op object
 466  *
 467  * RETURN:      Status
 468  *
 469  * DESCRIPTION: Get region address and length.
 470  *              Called from acpi_ds_exec_end_op during data_table_region parse
 471  *              tree walk.
 472  *
 473  ******************************************************************************/
 474
 475 acpi_status
 476 acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 477                                    union acpi_parse_object *op)
 478 {
 479         acpi_status status;
 480         union acpi_operand_object *obj_desc;
 481         union acpi_operand_object **operand;
 482         struct acpi_namespace_node *node;
 483         union acpi_parse_object *next_op;
 484         struct acpi_table_header *table;
 485         u32 table_index;
 486
 487         ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
 488
 489         /*
 490          * This is where we evaluate the Signature string, oem_id string,
 491          * and oem_table_id string of the Data Table Region declaration
 492          */
 493         node = op->common.node;
 494
 495         /* next_op points to Signature string op */
 496
 497         next_op = op->common.value.arg;
 498
 499         /*
 500          * Evaluate/create the Signature string, oem_id string,
 501          * and oem_table_id string operands
 502          */
 503         status = acpi_ds_create_operands(walk_state, next_op);
 504         if (ACPI_FAILURE(status)) {
 505                 return_ACPI_STATUS(status);
 506         }
 507
 508         operand = &walk_state->operands[0];
 509
 510         /*
 511          * Resolve the Signature string, oem_id string,
 512          * and oem_table_id string operands
 513          */
 514         status =
 515             acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 516                                      walk_state);
 517         if (ACPI_FAILURE(status)) {
 518                 goto cleanup;
 519         }
 520
 521         /* Find the ACPI table */
 522
 523         status = acpi_tb_find_table(operand[0]->string.pointer,
 524                                     operand[1]->string.pointer,
 525                                     operand[2]->string.pointer, &table_index);
 526         if (ACPI_FAILURE(status)) {
 527                 if (status == AE_NOT_FOUND) {
 528                         ACPI_ERROR((AE_INFO,
 529                                     "ACPI Table [%4.4s] OEM:(%s, %s) not found in RSDT/XSDT",
 530                                     operand[0]->string.pointer,
 531                                     operand[1]->string.pointer,
 532                                     operand[2]->string.pointer));
 533                 }
 534                 goto cleanup;
 535         }
 536
 537         status = acpi_get_table_by_index(table_index, &table);
 538         if (ACPI_FAILURE(status)) {
 539                 goto cleanup;
 540         }
 541
 542         obj_desc = acpi_ns_get_attached_object(node);
 543         if (!obj_desc) {
 544                 status = AE_NOT_EXIST;
 545                 goto cleanup;
 546         }
 547
 548         obj_desc->region.address = ACPI_PTR_TO_PHYSADDR(table);
 549         obj_desc->region.length = table->length;
 550
 551         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 552                           obj_desc,
 553                           ACPI_FORMAT_UINT64(obj_desc->region.address),
 554                           obj_desc->region.length));
 555
 556         /* Now the address and length are valid for this opregion */
 557
 558         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 559
 560 cleanup:
 561         acpi_ut_remove_reference(operand[0]);
 562         acpi_ut_remove_reference(operand[1]);
 563         acpi_ut_remove_reference(operand[2]);
 564
 565         return_ACPI_STATUS(status);
 566 }
 567
 568 /*******************************************************************************
 569  *
 570  * FUNCTION:    acpi_ds_eval_data_object_operands
 571  *
 572  * PARAMETERS:  walk_state      - Current walk
 573  *              op              - A valid data_object Op object
 574  *              obj_desc        - data_object
 575  *
 576  * RETURN:      Status
 577  *
 578  * DESCRIPTION: Get the operands and complete the following data object types:
 579  *              Buffer, Package.
 580  *
 581  ******************************************************************************/
 582
 583 acpi_status
 584 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 585                                   union acpi_parse_object *op,
 586                                   union acpi_operand_object *obj_desc)
 587 {
 588         acpi_status status;
 589         union acpi_operand_object *arg_desc;
 590         u32 length;
 591
 592         ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
 593
 594         /* The first operand (for all of these data objects) is the length */
 595
 596         /*
 597          * Set proper index into operand stack for acpi_ds_obj_stack_push
 598          * invoked inside acpi_ds_create_operand.
 599          */
 600         walk_state->operand_index = walk_state->num_operands;
 601
 602         /* Ignore if child is not valid */
 603
 604         if (!op->common.value.arg) {
 605                 ACPI_ERROR((AE_INFO,
 606                             "Dispatch: Missing child while executing TermArg for %X",
 607                             op->common.aml_opcode));
 608                 return_ACPI_STATUS(AE_OK);
 609         }
 610
 611         status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 612         if (ACPI_FAILURE(status)) {
 613                 return_ACPI_STATUS(status);
 614         }
 615
 616         status = acpi_ex_resolve_operands(walk_state->opcode,
 617                                           &(walk_state->
 618                                             operands[walk_state->num_operands -
 619                                                      1]), walk_state);
 620         if (ACPI_FAILURE(status)) {
 621                 return_ACPI_STATUS(status);
 622         }
 623
 624         /* Extract length operand */
 625
 626         arg_desc = walk_state->operands[walk_state->num_operands - 1];
 627         length = (u32) arg_desc->integer.value;
 628
 629         /* Cleanup for length operand */
 630
 631         status = acpi_ds_obj_stack_pop(1, walk_state);
 632         if (ACPI_FAILURE(status)) {
 633                 return_ACPI_STATUS(status);
 634         }
 635
 636         acpi_ut_remove_reference(arg_desc);
 637
 638         /*
 639          * Create the actual data object
 640          */
 641         switch (op->common.aml_opcode) {
 642         case AML_BUFFER_OP:
 643
 644                 status =
 645                     acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 646                                                       &obj_desc);
 647                 break;
 648
 649         case AML_PACKAGE_OP:
 650         case AML_VARIABLE_PACKAGE_OP:
 651
 652                 status =
 653                     acpi_ds_build_internal_package_obj(walk_state, op, length,
 654                                                        &obj_desc);
 655                 break;
 656
 657         default:
 658
 659                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 660         }
 661
 662         if (ACPI_SUCCESS(status)) {
 663                 /*
 664                  * Return the object in the walk_state, unless the parent is a package -
 665                  * in this case, the return object will be stored in the parse tree
 666                  * for the package.
 667                  */
 668                 if ((!op->common.parent) ||
 669                     ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
 670                      (op->common.parent->common.aml_opcode !=
 671                       AML_VARIABLE_PACKAGE_OP)
 672                      && (op->common.parent->common.aml_opcode !=
 673                          AML_NAME_OP))) {
 674                         walk_state->result_obj = obj_desc;
 675                 }
 676         }
 677
 678         return_ACPI_STATUS(status);
 679 }
 680
 681 /*******************************************************************************
 682  *
 683  * FUNCTION:    acpi_ds_eval_bank_field_operands
 684  *
 685  * PARAMETERS:  walk_state      - Current walk
 686  *              op              - A valid bank_field Op object
 687  *
 688  * RETURN:      Status
 689  *
 690  * DESCRIPTION: Get bank_field bank_value
 691  *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
 692  *
 693  ******************************************************************************/
 694
 695 acpi_status
 696 acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
 697                                  union acpi_parse_object *op)
 698 {
 699         acpi_status status;
 700         union acpi_operand_object *obj_desc;
 701         union acpi_operand_object *operand_desc;
 702         struct acpi_namespace_node *node;
 703         union acpi_parse_object *next_op;
 704         union acpi_parse_object *arg;
 705
 706         ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
 707
 708         /*
 709          * This is where we evaluate the bank_value field of the
 710          * bank_field declaration
 711          */
 712
 713         /* next_op points to the op that holds the Region */
 714
 715         next_op = op->common.value.arg;
 716
 717         /* next_op points to the op that holds the Bank Register */
 718
 719         next_op = next_op->common.next;
 720
 721         /* next_op points to the op that holds the Bank Value */
 722
 723         next_op = next_op->common.next;
 724
 725         /*
 726          * Set proper index into operand stack for acpi_ds_obj_stack_push
 727          * invoked inside acpi_ds_create_operand.
 728          *
 729          * We use walk_state->Operands[0] to store the evaluated bank_value
 730          */
 731         walk_state->operand_index = 0;
 732
 733         status = acpi_ds_create_operand(walk_state, next_op, 0);
 734         if (ACPI_FAILURE(status)) {
 735                 return_ACPI_STATUS(status);
 736         }
 737
 738         status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
 739         if (ACPI_FAILURE(status)) {
 740                 return_ACPI_STATUS(status);
 741         }
 742
 743         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
 744                            acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
 745         /*
 746          * Get the bank_value operand and save it
 747          * (at Top of stack)
 748          */
 749         operand_desc = walk_state->operands[0];
 750
 751         /* Arg points to the start Bank Field */
 752
 753         arg = acpi_ps_get_arg(op, 4);
 754         while (arg) {
 755
 756                 /* Ignore OFFSET and ACCESSAS terms here */
 757
 758                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 759                         node = arg->common.node;
 760
 761                         obj_desc = acpi_ns_get_attached_object(node);
 762                         if (!obj_desc) {
 763                                 return_ACPI_STATUS(AE_NOT_EXIST);
 764                         }
 765
 766                         obj_desc->bank_field.value =
 767                             (u32) operand_desc->integer.value;
 768                 }
 769
 770                 /* Move to next field in the list */
 771
 772                 arg = arg->common.next;
 773         }
 774
 775         acpi_ut_remove_reference(operand_desc);
 776         return_ACPI_STATUS(status);
 777 }