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 - 2025, 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(node: obj_handle);
50
51 /* Namespace is NOT locked */
52
53 status = acpi_ev_initialize_region(region_obj: 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, field_attribute: 0,
214 field_bit_position: bit_offset, field_bit_length: 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(object: offset_desc);
234 acpi_ut_remove_reference(object: buffer_desc);
235
236 if (aml_opcode == AML_CREATE_FIELD_OP) {
237 acpi_ut_remove_reference(object: length_desc);
238 }
239
240 /* On failure, delete the result descriptor */
241
242 if (ACPI_FAILURE(status)) {
243 acpi_ut_remove_reference(object: 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, first_arg: 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(opcode: 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(aml_opcode: op->common.aml_opcode, obj_desc,
321 buffer_desc: walk_state->operands[0],
322 offset_desc: walk_state->operands[1],
323 length_desc: walk_state->operands[2],
324 result_desc: walk_state->operands[3]);
325 } else {
326 /* All other, create_xxx_field opcodes */
327
328 status =
329 acpi_ds_init_buffer_field(aml_opcode: op->common.aml_opcode, obj_desc,
330 buffer_desc: walk_state->operands[0],
331 offset_desc: walk_state->operands[1], NULL,
332 result_desc: 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, first_arg: 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(opcode: 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(object: 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(object: 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(space_id: obj_desc->region.space_id,
435 address: obj_desc->region.address,
436 length: obj_desc->region.length, region_node: 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, first_arg: 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(opcode: 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(signature: operand[0]->string.pointer,
508 oem_id: operand[1]->string.pointer,
509 oem_table_id: operand[2]->string.pointer, table_index: &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, out_table: &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
545cleanup:
546 acpi_ut_remove_reference(object: operand[0]);
547 acpi_ut_remove_reference(object: operand[1]);
548 acpi_ut_remove_reference(object: 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
568acpi_status
569acpi_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, arg: op->common.value.arg, args_remaining: 1);
597 if (ACPI_FAILURE(status)) {
598 return_ACPI_STATUS(status);
599 }
600
601 status = acpi_ex_resolve_operands(opcode: walk_state->opcode,
602 stack_ptr: &(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(pop_count: 1, walk_state);
617 if (ACPI_FAILURE(status)) {
618 return_ACPI_STATUS(status);
619 }
620
621 acpi_ut_remove_reference(object: 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, buffer_length: length,
631 obj_desc_ptr: &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, package_length: length,
639 obj_desc: &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
680acpi_status
681acpi_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, arg: next_op, args_remaining: 0);
719 if (ACPI_FAILURE(status)) {
720 return_ACPI_STATUS(status);
721 }
722
723 status = acpi_ex_resolve_to_value(stack_ptr: &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, argn: 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(object: operand_desc);
761 return_ACPI_STATUS(status);
762}
763