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 - 2018, 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_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                ACPI_ERROR((AE_INFO,
 198                            "Field [%4.4s] at bit offset/length %u/%u "
 199                            "exceeds size of target Buffer (%u bits)",
 200                            acpi_ut_get_node_name(result_desc), bit_offset,
 201                            bit_count, 8 * (u32)buffer_desc->buffer.length));
 202                status = AE_AML_BUFFER_LIMIT;
 203                goto cleanup;
 204        }
 205
 206        /*
 207         * Initialize areas of the field object that are common to all fields
 208         * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
 209         * UPDATE_RULE = 0 (UPDATE_PRESERVE)
 210         */
 211        status =
 212            acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
 213                                             bit_offset, bit_count);
 214        if (ACPI_FAILURE(status)) {
 215                goto cleanup;
 216        }
 217
 218        obj_desc->buffer_field.buffer_obj = buffer_desc;
 219
 220        /* Reference count for buffer_desc inherits obj_desc count */
 221
 222        buffer_desc->common.reference_count = (u16)
 223            (buffer_desc->common.reference_count +
 224             obj_desc->common.reference_count);
 225
 226cleanup:
 227
 228        /* Always delete the operands */
 229
 230        acpi_ut_remove_reference(offset_desc);
 231        acpi_ut_remove_reference(buffer_desc);
 232
 233        if (aml_opcode == AML_CREATE_FIELD_OP) {
 234                acpi_ut_remove_reference(length_desc);
 235        }
 236
 237        /* On failure, delete the result descriptor */
 238
 239        if (ACPI_FAILURE(status)) {
 240                acpi_ut_remove_reference(result_desc);  /* Result descriptor */
 241        } else {
 242                /* Now the address and length are valid for this buffer_field */
 243
 244                obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
 245        }
 246
 247        return_ACPI_STATUS(status);
 248}
 249
 250/*******************************************************************************
 251 *
 252 * FUNCTION:    acpi_ds_eval_buffer_field_operands
 253 *
 254 * PARAMETERS:  walk_state      - Current walk
 255 *              op              - A valid buffer_field Op object
 256 *
 257 * RETURN:      Status
 258 *
 259 * DESCRIPTION: Get buffer_field Buffer and Index
 260 *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 261 *
 262 ******************************************************************************/
 263
 264acpi_status
 265acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
 266                                   union acpi_parse_object *op)
 267{
 268        acpi_status status;
 269        union acpi_operand_object *obj_desc;
 270        struct acpi_namespace_node *node;
 271        union acpi_parse_object *next_op;
 272
 273        ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
 274
 275        /*
 276         * This is where we evaluate the address and length fields of the
 277         * create_xxx_field declaration
 278         */
 279        node = op->common.node;
 280
 281        /* next_op points to the op that holds the Buffer */
 282
 283        next_op = op->common.value.arg;
 284
 285        /* Evaluate/create the address and length operands */
 286
 287        status = acpi_ds_create_operands(walk_state, next_op);
 288        if (ACPI_FAILURE(status)) {
 289                return_ACPI_STATUS(status);
 290        }
 291
 292        obj_desc = acpi_ns_get_attached_object(node);
 293        if (!obj_desc) {
 294                return_ACPI_STATUS(AE_NOT_EXIST);
 295        }
 296
 297        /* Resolve the operands */
 298
 299        status =
 300            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 301                                     walk_state);
 302        if (ACPI_FAILURE(status)) {
 303                ACPI_ERROR((AE_INFO, "(%s) bad operand(s), status 0x%X",
 304                            acpi_ps_get_opcode_name(op->common.aml_opcode),
 305                            status));
 306
 307                return_ACPI_STATUS(status);
 308        }
 309
 310        /* Initialize the Buffer Field */
 311
 312        if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 313
 314                /* NOTE: Slightly different operands for this opcode */
 315
 316                status =
 317                    acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 318                                              walk_state->operands[0],
 319                                              walk_state->operands[1],
 320                                              walk_state->operands[2],
 321                                              walk_state->operands[3]);
 322        } else {
 323                /* All other, create_xxx_field opcodes */
 324
 325                status =
 326                    acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 327                                              walk_state->operands[0],
 328                                              walk_state->operands[1], NULL,
 329                                              walk_state->operands[2]);
 330        }
 331
 332        return_ACPI_STATUS(status);
 333}
 334
 335/*******************************************************************************
 336 *
 337 * FUNCTION:    acpi_ds_eval_region_operands
 338 *
 339 * PARAMETERS:  walk_state      - Current walk
 340 *              op              - A valid region Op object
 341 *
 342 * RETURN:      Status
 343 *
 344 * DESCRIPTION: Get region address and length
 345 *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 346 *
 347 ******************************************************************************/
 348
 349acpi_status
 350acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
 351                             union acpi_parse_object *op)
 352{
 353        acpi_status status;
 354        union acpi_operand_object *obj_desc;
 355        union acpi_operand_object *operand_desc;
 356        struct acpi_namespace_node *node;
 357        union acpi_parse_object *next_op;
 358
 359        ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
 360
 361        /*
 362         * This is where we evaluate the address and length fields of the
 363         * op_region declaration
 364         */
 365        node = op->common.node;
 366
 367        /* next_op points to the op that holds the space_ID */
 368
 369        next_op = op->common.value.arg;
 370
 371        /* next_op points to address op */
 372
 373        next_op = next_op->common.next;
 374
 375        /* Evaluate/create the address and length operands */
 376
 377        status = acpi_ds_create_operands(walk_state, next_op);
 378        if (ACPI_FAILURE(status)) {
 379                return_ACPI_STATUS(status);
 380        }
 381
 382        /* Resolve the length and address operands to numbers */
 383
 384        status =
 385            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 386                                     walk_state);
 387        if (ACPI_FAILURE(status)) {
 388                return_ACPI_STATUS(status);
 389        }
 390
 391        obj_desc = acpi_ns_get_attached_object(node);
 392        if (!obj_desc) {
 393                return_ACPI_STATUS(AE_NOT_EXIST);
 394        }
 395
 396        /*
 397         * Get the length operand and save it
 398         * (at Top of stack)
 399         */
 400        operand_desc = walk_state->operands[walk_state->num_operands - 1];
 401
 402        obj_desc->region.length = (u32) operand_desc->integer.value;
 403        acpi_ut_remove_reference(operand_desc);
 404
 405        /*
 406         * Get the address and save it
 407         * (at top of stack - 1)
 408         */
 409        operand_desc = walk_state->operands[walk_state->num_operands - 2];
 410
 411        obj_desc->region.address = (acpi_physical_address)
 412            operand_desc->integer.value;
 413        acpi_ut_remove_reference(operand_desc);
 414
 415        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 416                          obj_desc,
 417                          ACPI_FORMAT_UINT64(obj_desc->region.address),
 418                          obj_desc->region.length));
 419
 420        /* Now the address and length are valid for this opregion */
 421
 422        obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 423        return_ACPI_STATUS(status);
 424}
 425
 426/*******************************************************************************
 427 *
 428 * FUNCTION:    acpi_ds_eval_table_region_operands
 429 *
 430 * PARAMETERS:  walk_state      - Current walk
 431 *              op              - A valid region Op object
 432 *
 433 * RETURN:      Status
 434 *
 435 * DESCRIPTION: Get region address and length.
 436 *              Called from acpi_ds_exec_end_op during data_table_region parse
 437 *              tree walk.
 438 *
 439 ******************************************************************************/
 440
 441acpi_status
 442acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 443                                   union acpi_parse_object *op)
 444{
 445        acpi_status status;
 446        union acpi_operand_object *obj_desc;
 447        union acpi_operand_object **operand;
 448        struct acpi_namespace_node *node;
 449        union acpi_parse_object *next_op;
 450        struct acpi_table_header *table;
 451        u32 table_index;
 452
 453        ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
 454
 455        /*
 456         * This is where we evaluate the Signature string, oem_id string,
 457         * and oem_table_id string of the Data Table Region declaration
 458         */
 459        node = op->common.node;
 460
 461        /* next_op points to Signature string op */
 462
 463        next_op = op->common.value.arg;
 464
 465        /*
 466         * Evaluate/create the Signature string, oem_id string,
 467         * and oem_table_id string operands
 468         */
 469        status = acpi_ds_create_operands(walk_state, next_op);
 470        if (ACPI_FAILURE(status)) {
 471                return_ACPI_STATUS(status);
 472        }
 473
 474        operand = &walk_state->operands[0];
 475
 476        /*
 477         * Resolve the Signature string, oem_id string,
 478         * and oem_table_id string operands
 479         */
 480        status =
 481            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 482                                     walk_state);
 483        if (ACPI_FAILURE(status)) {
 484                goto cleanup;
 485        }
 486
 487        /* Find the ACPI table */
 488
 489        status = acpi_tb_find_table(operand[0]->string.pointer,
 490                                    operand[1]->string.pointer,
 491                                    operand[2]->string.pointer, &table_index);
 492        if (ACPI_FAILURE(status)) {
 493                if (status == AE_NOT_FOUND) {
 494                        ACPI_ERROR((AE_INFO,
 495                                    "ACPI Table [%4.4s] OEM:(%s, %s) not found in RSDT/XSDT",
 496                                    operand[0]->string.pointer,
 497                                    operand[1]->string.pointer,
 498                                    operand[2]->string.pointer));
 499                }
 500                goto cleanup;
 501        }
 502
 503        status = acpi_get_table_by_index(table_index, &table);
 504        if (ACPI_FAILURE(status)) {
 505                goto cleanup;
 506        }
 507
 508        obj_desc = acpi_ns_get_attached_object(node);
 509        if (!obj_desc) {
 510                status = AE_NOT_EXIST;
 511                goto cleanup;
 512        }
 513
 514        obj_desc->region.address = ACPI_PTR_TO_PHYSADDR(table);
 515        obj_desc->region.length = table->length;
 516
 517        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 518                          obj_desc,
 519                          ACPI_FORMAT_UINT64(obj_desc->region.address),
 520                          obj_desc->region.length));
 521
 522        /* Now the address and length are valid for this opregion */
 523
 524        obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 525
 526cleanup:
 527        acpi_ut_remove_reference(operand[0]);
 528        acpi_ut_remove_reference(operand[1]);
 529        acpi_ut_remove_reference(operand[2]);
 530
 531        return_ACPI_STATUS(status);
 532}
 533
 534/*******************************************************************************
 535 *
 536 * FUNCTION:    acpi_ds_eval_data_object_operands
 537 *
 538 * PARAMETERS:  walk_state      - Current walk
 539 *              op              - A valid data_object Op object
 540 *              obj_desc        - data_object
 541 *
 542 * RETURN:      Status
 543 *
 544 * DESCRIPTION: Get the operands and complete the following data object types:
 545 *              Buffer, Package.
 546 *
 547 ******************************************************************************/
 548
 549acpi_status
 550acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 551                                  union acpi_parse_object *op,
 552                                  union acpi_operand_object *obj_desc)
 553{
 554        acpi_status status;
 555        union acpi_operand_object *arg_desc;
 556        u32 length;
 557
 558        ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
 559
 560        /* The first operand (for all of these data objects) is the length */
 561
 562        /*
 563         * Set proper index into operand stack for acpi_ds_obj_stack_push
 564         * invoked inside acpi_ds_create_operand.
 565         */
 566        walk_state->operand_index = walk_state->num_operands;
 567
 568        /* Ignore if child is not valid */
 569
 570        if (!op->common.value.arg) {
 571                ACPI_ERROR((AE_INFO,
 572                            "Missing child while evaluating opcode %4.4X, Op %p",
 573                            op->common.aml_opcode, op));
 574                return_ACPI_STATUS(AE_OK);
 575        }
 576
 577        status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 578        if (ACPI_FAILURE(status)) {
 579                return_ACPI_STATUS(status);
 580        }
 581
 582        status = acpi_ex_resolve_operands(walk_state->opcode,
 583                                          &(walk_state->
 584                                            operands[walk_state->num_operands -
 585                                                     1]), walk_state);
 586        if (ACPI_FAILURE(status)) {
 587                return_ACPI_STATUS(status);
 588        }
 589
 590        /* Extract length operand */
 591
 592        arg_desc = walk_state->operands[walk_state->num_operands - 1];
 593        length = (u32) arg_desc->integer.value;
 594
 595        /* Cleanup for length operand */
 596
 597        status = acpi_ds_obj_stack_pop(1, walk_state);
 598        if (ACPI_FAILURE(status)) {
 599                return_ACPI_STATUS(status);
 600        }
 601
 602        acpi_ut_remove_reference(arg_desc);
 603
 604        /*
 605         * Create the actual data object
 606         */
 607        switch (op->common.aml_opcode) {
 608        case AML_BUFFER_OP:
 609
 610                status =
 611                    acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 612                                                      &obj_desc);
 613                break;
 614
 615        case AML_PACKAGE_OP:
 616        case AML_VARIABLE_PACKAGE_OP:
 617
 618                status =
 619                    acpi_ds_build_internal_package_obj(walk_state, op, length,
 620                                                       &obj_desc);
 621                break;
 622
 623        default:
 624
 625                return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 626        }
 627
 628        if (ACPI_SUCCESS(status)) {
 629                /*
 630                 * Return the object in the walk_state, unless the parent is a package -
 631                 * in this case, the return object will be stored in the parse tree
 632                 * for the package.
 633                 */
 634                if ((!op->common.parent) ||
 635                    ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
 636                     (op->common.parent->common.aml_opcode !=
 637                      AML_VARIABLE_PACKAGE_OP)
 638                     && (op->common.parent->common.aml_opcode !=
 639                         AML_NAME_OP))) {
 640                        walk_state->result_obj = obj_desc;
 641                }
 642        }
 643
 644        return_ACPI_STATUS(status);
 645}
 646
 647/*******************************************************************************
 648 *
 649 * FUNCTION:    acpi_ds_eval_bank_field_operands
 650 *
 651 * PARAMETERS:  walk_state      - Current walk
 652 *              op              - A valid bank_field Op object
 653 *
 654 * RETURN:      Status
 655 *
 656 * DESCRIPTION: Get bank_field bank_value
 657 *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
 658 *
 659 ******************************************************************************/
 660
 661acpi_status
 662acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
 663                                 union acpi_parse_object *op)
 664{
 665        acpi_status status;
 666        union acpi_operand_object *obj_desc;
 667        union acpi_operand_object *operand_desc;
 668        struct acpi_namespace_node *node;
 669        union acpi_parse_object *next_op;
 670        union acpi_parse_object *arg;
 671
 672        ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
 673
 674        /*
 675         * This is where we evaluate the bank_value field of the
 676         * bank_field declaration
 677         */
 678
 679        /* next_op points to the op that holds the Region */
 680
 681        next_op = op->common.value.arg;
 682
 683        /* next_op points to the op that holds the Bank Register */
 684
 685        next_op = next_op->common.next;
 686
 687        /* next_op points to the op that holds the Bank Value */
 688
 689        next_op = next_op->common.next;
 690
 691        /*
 692         * Set proper index into operand stack for acpi_ds_obj_stack_push
 693         * invoked inside acpi_ds_create_operand.
 694         *
 695         * We use walk_state->Operands[0] to store the evaluated bank_value
 696         */
 697        walk_state->operand_index = 0;
 698
 699        status = acpi_ds_create_operand(walk_state, next_op, 0);
 700        if (ACPI_FAILURE(status)) {
 701                return_ACPI_STATUS(status);
 702        }
 703
 704        status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
 705        if (ACPI_FAILURE(status)) {
 706                return_ACPI_STATUS(status);
 707        }
 708
 709        ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
 710                           acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
 711        /*
 712         * Get the bank_value operand and save it
 713         * (at Top of stack)
 714         */
 715        operand_desc = walk_state->operands[0];
 716
 717        /* Arg points to the start Bank Field */
 718
 719        arg = acpi_ps_get_arg(op, 4);
 720        while (arg) {
 721
 722                /* Ignore OFFSET and ACCESSAS terms here */
 723
 724                if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 725                        node = arg->common.node;
 726
 727                        obj_desc = acpi_ns_get_attached_object(node);
 728                        if (!obj_desc) {
 729                                return_ACPI_STATUS(AE_NOT_EXIST);
 730                        }
 731
 732                        obj_desc->bank_field.value =
 733                            (u32) operand_desc->integer.value;
 734                }
 735
 736                /* Move to next field in the list */
 737
 738                arg = arg->common.next;
 739        }
 740
 741        acpi_ut_remove_reference(operand_desc);
 742        return_ACPI_STATUS(status);
 743}
 744