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
  21 ACPI_MODULE_NAME("dsopcode")
  22
  23 /* Local prototypes */
  24 static acpi_status
  25 acpi_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
  44 acpi_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
  74 static acpi_status
  75 acpi_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
 226 cleanup:
 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
 264 acpi_status
 265 acpi_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
 349 acpi_status
 350 acpi_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         status = acpi_ut_add_address_range(obj_desc->region.space_id,
 421                                            obj_desc->region.address,
 422                                            obj_desc->region.length, node);
 423
 424         /* Now the address and length are valid for this opregion */
 425
 426         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 427         return_ACPI_STATUS(status);
 428 }
 429
 430 /*******************************************************************************
 431  *
 432  * FUNCTION:    acpi_ds_eval_table_region_operands
 433  *
 434  * PARAMETERS:  walk_state      - Current walk
 435  *              op              - A valid region Op object
 436  *
 437  * RETURN:      Status
 438  *
 439  * DESCRIPTION: Get region address and length.
 440  *              Called from acpi_ds_exec_end_op during data_table_region parse
 441  *              tree walk.
 442  *
 443  ******************************************************************************/
 444
 445 acpi_status
 446 acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 447                                    union acpi_parse_object *op)
 448 {
 449         acpi_status status;
 450         union acpi_operand_object *obj_desc;
 451         union acpi_operand_object **operand;
 452         struct acpi_namespace_node *node;
 453         union acpi_parse_object *next_op;
 454         struct acpi_table_header *table;
 455         u32 table_index;
 456
 457         ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
 458
 459         /*
 460          * This is where we evaluate the Signature string, oem_id string,
 461          * and oem_table_id string of the Data Table Region declaration
 462          */
 463         node = op->common.node;
 464
 465         /* next_op points to Signature string op */
 466
 467         next_op = op->common.value.arg;
 468
 469         /*
 470          * Evaluate/create the Signature string, oem_id string,
 471          * and oem_table_id string operands
 472          */
 473         status = acpi_ds_create_operands(walk_state, next_op);
 474         if (ACPI_FAILURE(status)) {
 475                 return_ACPI_STATUS(status);
 476         }
 477
 478         operand = &walk_state->operands[0];
 479
 480         /*
 481          * Resolve the Signature string, oem_id string,
 482          * and oem_table_id string operands
 483          */
 484         status =
 485             acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 486                                      walk_state);
 487         if (ACPI_FAILURE(status)) {
 488                 goto cleanup;
 489         }
 490
 491         /* Find the ACPI table */
 492
 493         status = acpi_tb_find_table(operand[0]->string.pointer,
 494                                     operand[1]->string.pointer,
 495                                     operand[2]->string.pointer, &table_index);
 496         if (ACPI_FAILURE(status)) {
 497                 if (status == AE_NOT_FOUND) {
 498                         ACPI_ERROR((AE_INFO,
 499                                     "ACPI Table [%4.4s] OEM:(%s, %s) not found in RSDT/XSDT",
 500                                     operand[0]->string.pointer,
 501                                     operand[1]->string.pointer,
 502                                     operand[2]->string.pointer));
 503                 }
 504                 goto cleanup;
 505         }
 506
 507         status = acpi_get_table_by_index(table_index, &table);
 508         if (ACPI_FAILURE(status)) {
 509                 goto cleanup;
 510         }
 511
 512         obj_desc = acpi_ns_get_attached_object(node);
 513         if (!obj_desc) {
 514                 status = AE_NOT_EXIST;
 515                 goto cleanup;
 516         }
 517
 518         obj_desc->region.address = ACPI_PTR_TO_PHYSADDR(table);
 519         obj_desc->region.length = table->length;
 520
 521         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 522                           obj_desc,
 523                           ACPI_FORMAT_UINT64(obj_desc->region.address),
 524                           obj_desc->region.length));
 525
 526         status = acpi_ut_add_address_range(obj_desc->region.space_id,
 527                                            obj_desc->region.address,
 528                                            obj_desc->region.length, node);
 529
 530         /* Now the address and length are valid for this opregion */
 531
 532         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 533
 534 cleanup:
 535         acpi_ut_remove_reference(operand[0]);
 536         acpi_ut_remove_reference(operand[1]);
 537         acpi_ut_remove_reference(operand[2]);
 538
 539         return_ACPI_STATUS(status);
 540 }
 541
 542 /*******************************************************************************
 543  *
 544  * FUNCTION:    acpi_ds_eval_data_object_operands
 545  *
 546  * PARAMETERS:  walk_state      - Current walk
 547  *              op              - A valid data_object Op object
 548  *              obj_desc        - data_object
 549  *
 550  * RETURN:      Status
 551  *
 552  * DESCRIPTION: Get the operands and complete the following data object types:
 553  *              Buffer, Package.
 554  *
 555  ******************************************************************************/
 556
 557 acpi_status
 558 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 559                                   union acpi_parse_object *op,
 560                                   union acpi_operand_object *obj_desc)
 561 {
 562         acpi_status status;
 563         union acpi_operand_object *arg_desc;
 564         u32 length;
 565
 566         ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
 567
 568         /* The first operand (for all of these data objects) is the length */
 569
 570         /*
 571          * Set proper index into operand stack for acpi_ds_obj_stack_push
 572          * invoked inside acpi_ds_create_operand.
 573          */
 574         walk_state->operand_index = walk_state->num_operands;
 575
 576         /* Ignore if child is not valid */
 577
 578         if (!op->common.value.arg) {
 579                 ACPI_ERROR((AE_INFO,
 580                             "Missing child while evaluating opcode %4.4X, Op %p",
 581                             op->common.aml_opcode, op));
 582                 return_ACPI_STATUS(AE_OK);
 583         }
 584
 585         status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 586         if (ACPI_FAILURE(status)) {
 587                 return_ACPI_STATUS(status);
 588         }
 589
 590         status = acpi_ex_resolve_operands(walk_state->opcode,
 591                                           &(walk_state->
 592                                             operands[walk_state->num_operands -
 593                                                      1]), walk_state);
 594         if (ACPI_FAILURE(status)) {
 595                 return_ACPI_STATUS(status);
 596         }
 597
 598         /* Extract length operand */
 599
 600         arg_desc = walk_state->operands[walk_state->num_operands - 1];
 601         length = (u32) arg_desc->integer.value;
 602
 603         /* Cleanup for length operand */
 604
 605         status = acpi_ds_obj_stack_pop(1, walk_state);
 606         if (ACPI_FAILURE(status)) {
 607                 return_ACPI_STATUS(status);
 608         }
 609
 610         acpi_ut_remove_reference(arg_desc);
 611
 612         /*
 613          * Create the actual data object
 614          */
 615         switch (op->common.aml_opcode) {
 616         case AML_BUFFER_OP:
 617
 618                 status =
 619                     acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 620                                                       &obj_desc);
 621                 break;
 622
 623         case AML_PACKAGE_OP:
 624         case AML_VARIABLE_PACKAGE_OP:
 625
 626                 status =
 627                     acpi_ds_build_internal_package_obj(walk_state, op, length,
 628                                                        &obj_desc);
 629                 break;
 630
 631         default:
 632
 633                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 634         }
 635
 636         if (ACPI_SUCCESS(status)) {
 637                 /*
 638                  * Return the object in the walk_state, unless the parent is a package -
 639                  * in this case, the return object will be stored in the parse tree
 640                  * for the package.
 641                  */
 642                 if ((!op->common.parent) ||
 643                     ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
 644                      (op->common.parent->common.aml_opcode !=
 645                       AML_VARIABLE_PACKAGE_OP)
 646                      && (op->common.parent->common.aml_opcode !=
 647                          AML_NAME_OP))) {
 648                         walk_state->result_obj = obj_desc;
 649                 }
 650         }
 651
 652         return_ACPI_STATUS(status);
 653 }
 654
 655 /*******************************************************************************
 656  *
 657  * FUNCTION:    acpi_ds_eval_bank_field_operands
 658  *
 659  * PARAMETERS:  walk_state      - Current walk
 660  *              op              - A valid bank_field Op object
 661  *
 662  * RETURN:      Status
 663  *
 664  * DESCRIPTION: Get bank_field bank_value
 665  *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
 666  *
 667  ******************************************************************************/
 668
 669 acpi_status
 670 acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
 671                                  union acpi_parse_object *op)
 672 {
 673         acpi_status status;
 674         union acpi_operand_object *obj_desc;
 675         union acpi_operand_object *operand_desc;
 676         struct acpi_namespace_node *node;
 677         union acpi_parse_object *next_op;
 678         union acpi_parse_object *arg;
 679
 680         ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
 681
 682         /*
 683          * This is where we evaluate the bank_value field of the
 684          * bank_field declaration
 685          */
 686
 687         /* next_op points to the op that holds the Region */
 688
 689         next_op = op->common.value.arg;
 690
 691         /* next_op points to the op that holds the Bank Register */
 692
 693         next_op = next_op->common.next;
 694
 695         /* next_op points to the op that holds the Bank Value */
 696
 697         next_op = next_op->common.next;
 698
 699         /*
 700          * Set proper index into operand stack for acpi_ds_obj_stack_push
 701          * invoked inside acpi_ds_create_operand.
 702          *
 703          * We use walk_state->Operands[0] to store the evaluated bank_value
 704          */
 705         walk_state->operand_index = 0;
 706
 707         status = acpi_ds_create_operand(walk_state, next_op, 0);
 708         if (ACPI_FAILURE(status)) {
 709                 return_ACPI_STATUS(status);
 710         }
 711
 712         status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
 713         if (ACPI_FAILURE(status)) {
 714                 return_ACPI_STATUS(status);
 715         }
 716
 717         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
 718                            acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
 719         /*
 720          * Get the bank_value operand and save it
 721          * (at Top of stack)
 722          */
 723         operand_desc = walk_state->operands[0];
 724
 725         /* Arg points to the start Bank Field */
 726
 727         arg = acpi_ps_get_arg(op, 4);
 728         while (arg) {
 729
 730                 /* Ignore OFFSET and ACCESSAS terms here */
 731
 732                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 733                         node = arg->common.node;
 734
 735                         obj_desc = acpi_ns_get_attached_object(node);
 736                         if (!obj_desc) {
 737                                 return_ACPI_STATUS(AE_NOT_EXIST);
 738                         }
 739
 740                         obj_desc->bank_field.value =
 741                             (u32) operand_desc->integer.value;
 742                 }
 743
 744                 /* Move to next field in the list */
 745
 746                 arg = arg->common.next;
 747         }
 748
 749         acpi_ut_remove_reference(operand_desc);
 750         return_ACPI_STATUS(status);
 751 }