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 - 2023, 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 acpi_ds_initialize_region(acpi_handle obj_handle)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 acpi_ds_init_buffer_field(u16 aml_opcode,union acpi_operand_object * obj_desc,union acpi_operand_object * buffer_desc,union acpi_operand_object * offset_desc,union acpi_operand_object * length_desc,union acpi_operand_object * result_desc)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_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); 228 229 cleanup: 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 ******************************************************************************/ 266 267 acpi_status acpi_ds_eval_buffer_field_operands(struct acpi_walk_state * walk_state,union acpi_parse_object * op)268 acpi_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 ******************************************************************************/ 351 352 acpi_status acpi_ds_eval_region_operands(struct acpi_walk_state * walk_state,union acpi_parse_object * op)353 acpi_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 ******************************************************************************/ 458 459 acpi_status acpi_ds_eval_table_region_operands(struct acpi_walk_state * walk_state,union acpi_parse_object * op)460 acpi_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 obj_desc->region.pointer = table; 535 536 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n", 537 obj_desc, 538 ACPI_FORMAT_UINT64(obj_desc->region.address), 539 obj_desc->region.length)); 540 541 /* Now the address and length are valid for this opregion */ 542 543 obj_desc->region.flags |= AOPOBJ_DATA_VALID; 544 545 cleanup: 546 acpi_ut_remove_reference(operand[0]); 547 acpi_ut_remove_reference(operand[1]); 548 acpi_ut_remove_reference(operand[2]); 549 550 return_ACPI_STATUS(status); 551 } 552 553 /******************************************************************************* 554 * 555 * FUNCTION: acpi_ds_eval_data_object_operands 556 * 557 * PARAMETERS: walk_state - Current walk 558 * op - A valid data_object Op object 559 * obj_desc - data_object 560 * 561 * RETURN: Status 562 * 563 * DESCRIPTION: Get the operands and complete the following data object types: 564 * Buffer, Package. 565 * 566 ******************************************************************************/ 567 568 acpi_status acpi_ds_eval_data_object_operands(struct acpi_walk_state * walk_state,union acpi_parse_object * op,union acpi_operand_object * obj_desc)569 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state, 570 union acpi_parse_object *op, 571 union acpi_operand_object *obj_desc) 572 { 573 acpi_status status; 574 union acpi_operand_object *arg_desc; 575 u32 length; 576 577 ACPI_FUNCTION_TRACE(ds_eval_data_object_operands); 578 579 /* The first operand (for all of these data objects) is the length */ 580 581 /* 582 * Set proper index into operand stack for acpi_ds_obj_stack_push 583 * invoked inside acpi_ds_create_operand. 584 */ 585 walk_state->operand_index = walk_state->num_operands; 586 587 /* Ignore if child is not valid */ 588 589 if (!op->common.value.arg) { 590 ACPI_ERROR((AE_INFO, 591 "Missing child while evaluating opcode %4.4X, Op %p", 592 op->common.aml_opcode, op)); 593 return_ACPI_STATUS(AE_OK); 594 } 595 596 status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1); 597 if (ACPI_FAILURE(status)) { 598 return_ACPI_STATUS(status); 599 } 600 601 status = acpi_ex_resolve_operands(walk_state->opcode, 602 &(walk_state-> 603 operands[walk_state->num_operands - 604 1]), walk_state); 605 if (ACPI_FAILURE(status)) { 606 return_ACPI_STATUS(status); 607 } 608 609 /* Extract length operand */ 610 611 arg_desc = walk_state->operands[walk_state->num_operands - 1]; 612 length = (u32) arg_desc->integer.value; 613 614 /* Cleanup for length operand */ 615 616 status = acpi_ds_obj_stack_pop(1, walk_state); 617 if (ACPI_FAILURE(status)) { 618 return_ACPI_STATUS(status); 619 } 620 621 acpi_ut_remove_reference(arg_desc); 622 623 /* 624 * Create the actual data object 625 */ 626 switch (op->common.aml_opcode) { 627 case AML_BUFFER_OP: 628 629 status = 630 acpi_ds_build_internal_buffer_obj(walk_state, op, length, 631 &obj_desc); 632 break; 633 634 case AML_PACKAGE_OP: 635 case AML_VARIABLE_PACKAGE_OP: 636 637 status = 638 acpi_ds_build_internal_package_obj(walk_state, op, length, 639 &obj_desc); 640 break; 641 642 default: 643 644 return_ACPI_STATUS(AE_AML_BAD_OPCODE); 645 } 646 647 if (ACPI_SUCCESS(status)) { 648 /* 649 * Return the object in the walk_state, unless the parent is a package - 650 * in this case, the return object will be stored in the parse tree 651 * for the package. 652 */ 653 if ((!op->common.parent) || 654 ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) && 655 (op->common.parent->common.aml_opcode != 656 AML_VARIABLE_PACKAGE_OP) 657 && (op->common.parent->common.aml_opcode != 658 AML_NAME_OP))) { 659 walk_state->result_obj = obj_desc; 660 } 661 } 662 663 return_ACPI_STATUS(status); 664 } 665 666 /******************************************************************************* 667 * 668 * FUNCTION: acpi_ds_eval_bank_field_operands 669 * 670 * PARAMETERS: walk_state - Current walk 671 * op - A valid bank_field Op object 672 * 673 * RETURN: Status 674 * 675 * DESCRIPTION: Get bank_field bank_value 676 * Called from acpi_ds_exec_end_op during bank_field parse tree walk 677 * 678 ******************************************************************************/ 679 680 acpi_status acpi_ds_eval_bank_field_operands(struct acpi_walk_state * walk_state,union acpi_parse_object * op)681 acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state, 682 union acpi_parse_object *op) 683 { 684 acpi_status status; 685 union acpi_operand_object *obj_desc; 686 union acpi_operand_object *operand_desc; 687 struct acpi_namespace_node *node; 688 union acpi_parse_object *next_op; 689 union acpi_parse_object *arg; 690 691 ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op); 692 693 /* 694 * This is where we evaluate the bank_value field of the 695 * bank_field declaration 696 */ 697 698 /* next_op points to the op that holds the Region */ 699 700 next_op = op->common.value.arg; 701 702 /* next_op points to the op that holds the Bank Register */ 703 704 next_op = next_op->common.next; 705 706 /* next_op points to the op that holds the Bank Value */ 707 708 next_op = next_op->common.next; 709 710 /* 711 * Set proper index into operand stack for acpi_ds_obj_stack_push 712 * invoked inside acpi_ds_create_operand. 713 * 714 * We use walk_state->Operands[0] to store the evaluated bank_value 715 */ 716 walk_state->operand_index = 0; 717 718 status = acpi_ds_create_operand(walk_state, next_op, 0); 719 if (ACPI_FAILURE(status)) { 720 return_ACPI_STATUS(status); 721 } 722 723 status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state); 724 if (ACPI_FAILURE(status)) { 725 return_ACPI_STATUS(status); 726 } 727 728 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, 729 acpi_ps_get_opcode_name(op->common.aml_opcode), 1); 730 /* 731 * Get the bank_value operand and save it 732 * (at Top of stack) 733 */ 734 operand_desc = walk_state->operands[0]; 735 736 /* Arg points to the start Bank Field */ 737 738 arg = acpi_ps_get_arg(op, 4); 739 while (arg) { 740 741 /* Ignore OFFSET and ACCESSAS terms here */ 742 743 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) { 744 node = arg->common.node; 745 746 obj_desc = acpi_ns_get_attached_object(node); 747 if (!obj_desc) { 748 return_ACPI_STATUS(AE_NOT_EXIST); 749 } 750 751 obj_desc->bank_field.value = 752 (u32) operand_desc->integer.value; 753 } 754 755 /* Move to next field in the list */ 756 757 arg = arg->common.next; 758 } 759 760 acpi_ut_remove_reference(operand_desc); 761 return_ACPI_STATUS(status); 762 } 763