LXR linux/drivers/acpi/acpica/dsopcode.c

   1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2/******************************************************************************
   3 *
   4 * Module Name: dsopcode - Dispatcher support for regions and fields
   5 *
   6 * Copyright (C) 2000 - 2020, Intel Corp.
   7 *
   8 *****************************************************************************/
   9
  10#include <acpi/acpi.h>
  11#include "accommon.h"
  12#include "acparser.h"
  13#include "amlcode.h"
  14#include "acdispat.h"
  15#include "acinterp.h"
  16#include "acnamesp.h"
  17#include "acevents.h"
  18#include "actables.h"
  19
  20#define _COMPONENT          ACPI_DISPATCHER
  21ACPI_MODULE_NAME("dsopcode")
  22
  23/* Local prototypes */
  24static acpi_status
  25acpi_ds_init_buffer_field(u16 aml_opcode,
  26                          union acpi_operand_object *obj_desc,
  27                          union acpi_operand_object *buffer_desc,
  28                          union acpi_operand_object *offset_desc,
  29                          union acpi_operand_object *length_desc,
  30                          union acpi_operand_object *result_desc);
  31
  32/*******************************************************************************
  33 *
  34 * FUNCTION:    acpi_ds_initialize_region
  35 *
  36 * PARAMETERS:  obj_handle      - Region namespace node
  37 *
  38 * RETURN:      Status
  39 *
  40 * DESCRIPTION: Front end to ev_initialize_region
  41 *
  42 ******************************************************************************/
  43
  44acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
  45{
  46        union acpi_operand_object *obj_desc;
  47        acpi_status status;
  48
  49        obj_desc = acpi_ns_get_attached_object(obj_handle);
  50
  51        /* Namespace is NOT locked */
  52
  53        status = acpi_ev_initialize_region(obj_desc);
  54        return (status);
  55}
  56
  57/*******************************************************************************
  58 *
  59 * FUNCTION:    acpi_ds_init_buffer_field
  60 *
  61 * PARAMETERS:  aml_opcode      - create_xxx_field
  62 *              obj_desc        - buffer_field object
  63 *              buffer_desc     - Host Buffer
  64 *              offset_desc     - Offset into buffer
  65 *              length_desc     - Length of field (CREATE_FIELD_OP only)
  66 *              result_desc     - Where to store the result
  67 *
  68 * RETURN:      Status
  69 *
  70 * DESCRIPTION: Perform actual initialization of a buffer field
  71 *
  72 ******************************************************************************/
  73
  74static acpi_status
  75acpi_ds_init_buffer_field(u16 aml_opcode,
  76                          union acpi_operand_object *obj_desc,
  77                          union acpi_operand_object *buffer_desc,
  78                          union acpi_operand_object *offset_desc,
  79                          union acpi_operand_object *length_desc,
  80                          union acpi_operand_object *result_desc)
  81{
  82        u32 offset;
  83        u32 bit_offset;
  84        u32 bit_count;
  85        u8 field_flags;
  86        acpi_status status;
  87
  88        ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
  89
  90        /* Host object must be a Buffer */
  91
  92        if (buffer_desc->common.type != ACPI_TYPE_BUFFER) {
  93                ACPI_ERROR((AE_INFO,
  94                            "Target of Create Field is not a Buffer object - %s",
  95                            acpi_ut_get_object_type_name(buffer_desc)));
  96
  97                status = AE_AML_OPERAND_TYPE;
  98                goto cleanup;
  99        }
 100
 101        /*
 102         * The last parameter to all of these opcodes (result_desc) started
 103         * out as a name_string, and should therefore now be a NS node
 104         * after resolution in acpi_ex_resolve_operands().
 105         */
 106        if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
 107                ACPI_ERROR((AE_INFO,
 108                            "(%s) destination not a NS Node [%s]",
 109                            acpi_ps_get_opcode_name(aml_opcode),
 110                            acpi_ut_get_descriptor_name(result_desc)));
 111
 112                status = AE_AML_OPERAND_TYPE;
 113                goto cleanup;
 114        }
 115
 116        offset = (u32) offset_desc->integer.value;
 117
 118        /*
 119         * Setup the Bit offsets and counts, according to the opcode
 120         */
 121        switch (aml_opcode) {
 122        case AML_CREATE_FIELD_OP:
 123
 124                /* Offset is in bits, count is in bits */
 125
 126                field_flags = AML_FIELD_ACCESS_BYTE;
 127                bit_offset = offset;
 128                bit_count = (u32) length_desc->integer.value;
 129
 130                /* Must have a valid (>0) bit count */
 131
 132                if (bit_count == 0) {
 133                        ACPI_BIOS_ERROR((AE_INFO,
 134                                         "Attempt to CreateField of length zero"));
 135                        status = AE_AML_OPERAND_VALUE;
 136                        goto cleanup;
 137                }
 138                break;
 139
 140        case AML_CREATE_BIT_FIELD_OP:
 141
 142                /* Offset is in bits, Field is one bit */
 143
 144                bit_offset = offset;
 145                bit_count = 1;
 146                field_flags = AML_FIELD_ACCESS_BYTE;
 147                break;
 148
 149        case AML_CREATE_BYTE_FIELD_OP:
 150
 151                /* Offset is in bytes, field is one byte */
 152
 153                bit_offset = 8 * offset;
 154                bit_count = 8;
 155                field_flags = AML_FIELD_ACCESS_BYTE;
 156                break;
 157
 158        case AML_CREATE_WORD_FIELD_OP:
 159
 160                /* Offset is in bytes, field is one word */
 161
 162                bit_offset = 8 * offset;
 163                bit_count = 16;
 164                field_flags = AML_FIELD_ACCESS_WORD;
 165                break;
 166
 167        case AML_CREATE_DWORD_FIELD_OP:
 168
 169                /* Offset is in bytes, field is one dword */
 170
 171                bit_offset = 8 * offset;
 172                bit_count = 32;
 173                field_flags = AML_FIELD_ACCESS_DWORD;
 174                break;
 175
 176        case AML_CREATE_QWORD_FIELD_OP:
 177
 178                /* Offset is in bytes, field is one qword */
 179
 180                bit_offset = 8 * offset;
 181                bit_count = 64;
 182                field_flags = AML_FIELD_ACCESS_QWORD;
 183                break;
 184
 185        default:
 186
 187                ACPI_ERROR((AE_INFO,
 188                            "Unknown field creation opcode 0x%02X",
 189                            aml_opcode));
 190                status = AE_AML_BAD_OPCODE;
 191                goto cleanup;
 192        }
 193
 194        /* Entire field must fit within the current length of the buffer */
 195
 196        if ((bit_offset + bit_count) > (8 * (u32)buffer_desc->buffer.length)) {
 197                status = AE_AML_BUFFER_LIMIT;
 198                ACPI_BIOS_EXCEPTION((AE_INFO, status,
 199                                     "Field [%4.4s] at bit offset/length %u/%u "
 200                                     "exceeds size of target Buffer (%u bits)",
 201                                     acpi_ut_get_node_name(result_desc),
 202                                     bit_offset, bit_count,
 203                                     8 * (u32)buffer_desc->buffer.length));
 204                goto cleanup;
 205        }
 206
 207        /*
 208         * Initialize areas of the field object that are common to all fields
 209         * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
 210         * UPDATE_RULE = 0 (UPDATE_PRESERVE)
 211         */
 212        status =
 213            acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
 214                                             bit_offset, bit_count);
 215        if (ACPI_FAILURE(status)) {
 216                goto cleanup;
 217        }
 218
 219        obj_desc->buffer_field.buffer_obj = buffer_desc;
 220        obj_desc->buffer_field.is_create_field =
 221            aml_opcode == AML_CREATE_FIELD_OP;
 222
 223        /* Reference count for buffer_desc inherits obj_desc count */
 224
 225        buffer_desc->common.reference_count = (u16)
 226            (buffer_desc->common.reference_count +
 227             obj_desc->common.reference_count);
 228
 229cleanup:
 230
 231        /* Always delete the operands */
 232
 233        acpi_ut_remove_reference(offset_desc);
 234        acpi_ut_remove_reference(buffer_desc);
 235
 236        if (aml_opcode == AML_CREATE_FIELD_OP) {
 237                acpi_ut_remove_reference(length_desc);
 238        }
 239
 240        /* On failure, delete the result descriptor */
 241
 242        if (ACPI_FAILURE(status)) {
 243                acpi_ut_remove_reference(result_desc);  /* Result descriptor */
 244        } else {
 245                /* Now the address and length are valid for this buffer_field */
 246
 247                obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
 248        }
 249
 250        return_ACPI_STATUS(status);
 251}
 252
 253/*******************************************************************************
 254 *
 255 * FUNCTION:    acpi_ds_eval_buffer_field_operands
 256 *
 257 * PARAMETERS:  walk_state      - Current walk
 258 *              op              - A valid buffer_field Op object
 259 *
 260 * RETURN:      Status
 261 *
 262 * DESCRIPTION: Get buffer_field Buffer and Index
 263 *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 264 *
 265 ******************************************************************************/
 266
 267acpi_status
 268acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
 269                                   union acpi_parse_object *op)
 270{
 271        acpi_status status;
 272        union acpi_operand_object *obj_desc;
 273        struct acpi_namespace_node *node;
 274        union acpi_parse_object *next_op;
 275
 276        ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
 277
 278        /*
 279         * This is where we evaluate the address and length fields of the
 280         * create_xxx_field declaration
 281         */
 282        node = op->common.node;
 283
 284        /* next_op points to the op that holds the Buffer */
 285
 286        next_op = op->common.value.arg;
 287
 288        /* Evaluate/create the address and length operands */
 289
 290        status = acpi_ds_create_operands(walk_state, next_op);
 291        if (ACPI_FAILURE(status)) {
 292                return_ACPI_STATUS(status);
 293        }
 294
 295        obj_desc = acpi_ns_get_attached_object(node);
 296        if (!obj_desc) {
 297                return_ACPI_STATUS(AE_NOT_EXIST);
 298        }
 299
 300        /* Resolve the operands */
 301
 302        status =
 303            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 304                                     walk_state);
 305        if (ACPI_FAILURE(status)) {
 306                ACPI_ERROR((AE_INFO, "(%s) bad operand(s), status 0x%X",
 307                            acpi_ps_get_opcode_name(op->common.aml_opcode),
 308                            status));
 309
 310                return_ACPI_STATUS(status);
 311        }
 312
 313        /* Initialize the Buffer Field */
 314
 315        if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 316
 317                /* NOTE: Slightly different operands for this opcode */
 318
 319                status =
 320                    acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 321                                              walk_state->operands[0],
 322                                              walk_state->operands[1],
 323                                              walk_state->operands[2],
 324                                              walk_state->operands[3]);
 325        } else {
 326                /* All other, create_xxx_field opcodes */
 327
 328                status =
 329                    acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 330                                              walk_state->operands[0],
 331                                              walk_state->operands[1], NULL,
 332                                              walk_state->operands[2]);
 333        }
 334
 335        return_ACPI_STATUS(status);
 336}
 337
 338/*******************************************************************************
 339 *
 340 * FUNCTION:    acpi_ds_eval_region_operands
 341 *
 342 * PARAMETERS:  walk_state      - Current walk
 343 *              op              - A valid region Op object
 344 *
 345 * RETURN:      Status
 346 *
 347 * DESCRIPTION: Get region address and length
 348 *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 349 *
 350 ******************************************************************************/
 351
 352acpi_status
 353acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
 354                             union acpi_parse_object *op)
 355{
 356        acpi_status status;
 357        union acpi_operand_object *obj_desc;
 358        union acpi_operand_object *operand_desc;
 359        struct acpi_namespace_node *node;
 360        union acpi_parse_object *next_op;
 361        acpi_adr_space_type space_id;
 362
 363        ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
 364
 365        /*
 366         * This is where we evaluate the address and length fields of the
 367         * op_region declaration
 368         */
 369        node = op->common.node;
 370
 371        /* next_op points to the op that holds the space_ID */
 372
 373        next_op = op->common.value.arg;
 374        space_id = (acpi_adr_space_type)next_op->common.value.integer;
 375
 376        /* next_op points to address op */
 377
 378        next_op = next_op->common.next;
 379
 380        /* Evaluate/create the address and length operands */
 381
 382        status = acpi_ds_create_operands(walk_state, next_op);
 383        if (ACPI_FAILURE(status)) {
 384                return_ACPI_STATUS(status);
 385        }
 386
 387        /* Resolve the length and address operands to numbers */
 388
 389        status =
 390            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 391                                     walk_state);
 392        if (ACPI_FAILURE(status)) {
 393                return_ACPI_STATUS(status);
 394        }
 395
 396        obj_desc = acpi_ns_get_attached_object(node);
 397        if (!obj_desc) {
 398                return_ACPI_STATUS(AE_NOT_EXIST);
 399        }
 400
 401        /*
 402         * Get the length operand and save it
 403         * (at Top of stack)
 404         */
 405        operand_desc = walk_state->operands[walk_state->num_operands - 1];
 406
 407        obj_desc->region.length = (u32) operand_desc->integer.value;
 408        acpi_ut_remove_reference(operand_desc);
 409
 410        /* A zero-length operation region is unusable. Just warn */
 411
 412        if (!obj_desc->region.length
 413            && (space_id < ACPI_NUM_PREDEFINED_REGIONS)) {
 414                ACPI_WARNING((AE_INFO,
 415                              "Operation Region [%4.4s] has zero length (SpaceId %X)",
 416                              node->name.ascii, space_id));
 417        }
 418
 419        /*
 420         * Get the address and save it
 421         * (at top of stack - 1)
 422         */
 423        operand_desc = walk_state->operands[walk_state->num_operands - 2];
 424
 425        obj_desc->region.address = (acpi_physical_address)
 426            operand_desc->integer.value;
 427        acpi_ut_remove_reference(operand_desc);
 428
 429        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 430                          obj_desc,
 431                          ACPI_FORMAT_UINT64(obj_desc->region.address),
 432                          obj_desc->region.length));
 433
 434        status = acpi_ut_add_address_range(obj_desc->region.space_id,
 435                                           obj_desc->region.address,
 436                                           obj_desc->region.length, node);
 437
 438        /* Now the address and length are valid for this opregion */
 439
 440        obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 441        return_ACPI_STATUS(status);
 442}
 443
 444/*******************************************************************************
 445 *
 446 * FUNCTION:    acpi_ds_eval_table_region_operands
 447 *
 448 * PARAMETERS:  walk_state      - Current walk
 449 *              op              - A valid region Op object
 450 *
 451 * RETURN:      Status
 452 *
 453 * DESCRIPTION: Get region address and length.
 454 *              Called from acpi_ds_exec_end_op during data_table_region parse
 455 *              tree walk.
 456 *
 457 ******************************************************************************/
 458
 459acpi_status
 460acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 461                                   union acpi_parse_object *op)
 462{
 463        acpi_status status;
 464        union acpi_operand_object *obj_desc;
 465        union acpi_operand_object **operand;
 466        struct acpi_namespace_node *node;
 467        union acpi_parse_object *next_op;
 468        struct acpi_table_header *table;
 469        u32 table_index;
 470
 471        ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
 472
 473        /*
 474         * This is where we evaluate the Signature string, oem_id string,
 475         * and oem_table_id string of the Data Table Region declaration
 476         */
 477        node = op->common.node;
 478
 479        /* next_op points to Signature string op */
 480
 481        next_op = op->common.value.arg;
 482
 483        /*
 484         * Evaluate/create the Signature string, oem_id string,
 485         * and oem_table_id string operands
 486         */
 487        status = acpi_ds_create_operands(walk_state, next_op);
 488        if (ACPI_FAILURE(status)) {
 489                return_ACPI_STATUS(status);
 490        }
 491
 492        operand = &walk_state->operands[0];
 493
 494        /*
 495         * Resolve the Signature string, oem_id string,
 496         * and oem_table_id string operands
 497         */
 498        status =
 499            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 500                                     walk_state);
 501        if (ACPI_FAILURE(status)) {
 502                goto cleanup;
 503        }
 504
 505        /* Find the ACPI table */
 506
 507        status = acpi_tb_find_table(operand[0]->string.pointer,
 508                                    operand[1]->string.pointer,
 509                                    operand[2]->string.pointer, &table_index);
 510        if (ACPI_FAILURE(status)) {
 511                if (status == AE_NOT_FOUND) {
 512                        ACPI_ERROR((AE_INFO,
 513                                    "ACPI Table [%4.4s] OEM:(%s, %s) not found in RSDT/XSDT",
 514                                    operand[0]->string.pointer,
 515                                    operand[1]->string.pointer,
 516                                    operand[2]->string.pointer));
 517                }
 518                goto cleanup;
 519        }
 520
 521        status = acpi_get_table_by_index(table_index, &table);
 522        if (ACPI_FAILURE(status)) {
 523                goto cleanup;
 524        }
 525
 526        obj_desc = acpi_ns_get_attached_object(node);
 527        if (!obj_desc) {
 528                status = AE_NOT_EXIST;
 529                goto cleanup;
 530        }
 531
 532        obj_desc->region.address = ACPI_PTR_TO_PHYSADDR(table);
 533        obj_desc->region.length = table->length;
 534
 535        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 536                          obj_desc,
 537                          ACPI_FORMAT_UINT64(obj_desc->region.address),
 538                          obj_desc->region.length));
 539
 540        /* Now the address and length are valid for this opregion */
 541
 542        obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 543
 544cleanup:
 545        acpi_ut_remove_reference(operand[0]);
 546        acpi_ut_remove_reference(operand[1]);
 547        acpi_ut_remove_reference(operand[2]);
 548
 549        return_ACPI_STATUS(status);
 550}
 551
 552/*******************************************************************************
 553 *
 554 * FUNCTION:    acpi_ds_eval_data_object_operands
 555 *
 556 * PARAMETERS:  walk_state      - Current walk
 557 *              op              - A valid data_object Op object
 558 *              obj_desc        - data_object
 559 *
 560 * RETURN:      Status
 561 *
 562 * DESCRIPTION: Get the operands and complete the following data object types:
 563 *              Buffer, Package.
 564 *
 565 ******************************************************************************/
 566
 567acpi_status
 568acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 569                                  union acpi_parse_object *op,
 570                                  union acpi_operand_object *obj_desc)
 571{
 572        acpi_status status;
 573        union acpi_operand_object *arg_desc;
 574        u32 length;
 575
 576        ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
 577
 578        /* The first operand (for all of these data objects) is the length */
 579
 580        /*
 581         * Set proper index into operand stack for acpi_ds_obj_stack_push
 582         * invoked inside acpi_ds_create_operand.
 583         */
 584        walk_state->operand_index = walk_state->num_operands;
 585
 586        /* Ignore if child is not valid */
 587
 588        if (!op->common.value.arg) {
 589                ACPI_ERROR((AE_INFO,
 590                            "Missing child while evaluating opcode %4.4X, Op %p",
 591                            op->common.aml_opcode, op));
 592                return_ACPI_STATUS(AE_OK);
 593        }
 594
 595        status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 596        if (ACPI_FAILURE(status)) {
 597                return_ACPI_STATUS(status);
 598        }
 599
 600        status = acpi_ex_resolve_operands(walk_state->opcode,
 601                                          &(walk_state->
 602                                            operands[walk_state->num_operands -
 603                                                     1]), walk_state);
 604        if (ACPI_FAILURE(status)) {
 605                return_ACPI_STATUS(status);
 606        }
 607
 608        /* Extract length operand */
 609
 610        arg_desc = walk_state->operands[walk_state->num_operands - 1];
 611        length = (u32) arg_desc->integer.value;
 612
 613        /* Cleanup for length operand */
 614
 615        status = acpi_ds_obj_stack_pop(1, walk_state);
 616        if (ACPI_FAILURE(status)) {
 617                return_ACPI_STATUS(status);
 618        }
 619
 620        acpi_ut_remove_reference(arg_desc);
 621
 622        /*
 623         * Create the actual data object
 624         */
 625        switch (op->common.aml_opcode) {
 626        case AML_BUFFER_OP:
 627
 628                status =
 629                    acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 630                                                      &obj_desc);
 631                break;
 632
 633        case AML_PACKAGE_OP:
 634        case AML_VARIABLE_PACKAGE_OP:
 635
 636                status =
 637                    acpi_ds_build_internal_package_obj(walk_state, op, length,
 638                                                       &obj_desc);
 639                break;
 640
 641        default:
 642
 643                return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 644        }
 645
 646        if (ACPI_SUCCESS(status)) {
 647                /*
 648                 * Return the object in the walk_state, unless the parent is a package -
 649                 * in this case, the return object will be stored in the parse tree
 650                 * for the package.
 651                 */
 652                if ((!op->common.parent) ||
 653                    ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
 654                     (op->common.parent->common.aml_opcode !=
 655                      AML_VARIABLE_PACKAGE_OP)
 656                     && (op->common.parent->common.aml_opcode !=
 657                         AML_NAME_OP))) {
 658                        walk_state->result_obj = obj_desc;
 659                }
 660        }
 661
 662        return_ACPI_STATUS(status);
 663}
 664
 665/*******************************************************************************
 666 *
 667 * FUNCTION:    acpi_ds_eval_bank_field_operands
 668 *
 669 * PARAMETERS:  walk_state      - Current walk
 670 *              op              - A valid bank_field Op object
 671 *
 672 * RETURN:      Status
 673 *
 674 * DESCRIPTION: Get bank_field bank_value
 675 *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
 676 *
 677 ******************************************************************************/
 678
 679acpi_status
 680acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
 681                                 union acpi_parse_object *op)
 682{
 683        acpi_status status;
 684        union acpi_operand_object *obj_desc;
 685        union acpi_operand_object *operand_desc;
 686        struct acpi_namespace_node *node;
 687        union acpi_parse_object *next_op;
 688        union acpi_parse_object *arg;
 689
 690        ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
 691
 692        /*
 693         * This is where we evaluate the bank_value field of the
 694         * bank_field declaration
 695         */
 696
 697        /* next_op points to the op that holds the Region */
 698
 699        next_op = op->common.value.arg;
 700
 701        /* next_op points to the op that holds the Bank Register */
 702
 703        next_op = next_op->common.next;
 704
 705        /* next_op points to the op that holds the Bank Value */
 706
 707        next_op = next_op->common.next;
 708
 709        /*
 710         * Set proper index into operand stack for acpi_ds_obj_stack_push
 711         * invoked inside acpi_ds_create_operand.
 712         *
 713         * We use walk_state->Operands[0] to store the evaluated bank_value
 714         */
 715        walk_state->operand_index = 0;
 716
 717        status = acpi_ds_create_operand(walk_state, next_op, 0);
 718        if (ACPI_FAILURE(status)) {
 719                return_ACPI_STATUS(status);
 720        }
 721
 722        status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
 723        if (ACPI_FAILURE(status)) {
 724                return_ACPI_STATUS(status);
 725        }
 726
 727        ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
 728                           acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
 729        /*
 730         * Get the bank_value operand and save it
 731         * (at Top of stack)
 732         */
 733        operand_desc = walk_state->operands[0];
 734
 735        /* Arg points to the start Bank Field */
 736
 737        arg = acpi_ps_get_arg(op, 4);
 738        while (arg) {
 739
 740                /* Ignore OFFSET and ACCESSAS terms here */
 741
 742                if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 743                        node = arg->common.node;
 744
 745                        obj_desc = acpi_ns_get_attached_object(node);
 746                        if (!obj_desc) {
 747                                return_ACPI_STATUS(AE_NOT_EXIST);
 748                        }
 749
 750                        obj_desc->bank_field.value =
 751                            (u32) operand_desc->integer.value;
 752                }
 753
 754                /* Move to next field in the list */
 755
 756                arg = arg->common.next;
 757        }
 758
 759        acpi_ut_remove_reference(operand_desc);
 760        return_ACPI_STATUS(status);
 761}
 762