1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: dsfield - Dispatcher field routines
5 *
6 * Copyright (C) 2000 - 2019, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "amlcode.h"
13 #include "acdispat.h"
14 #include "acinterp.h"
15 #include "acnamesp.h"
16 #include "acparser.h"
17
18 #ifdef ACPI_EXEC_APP
19 #include "aecommon.h"
20 #endif
21
22 #define _COMPONENT ACPI_DISPATCHER
23 ACPI_MODULE_NAME("dsfield")
24
25 /* Local prototypes */
26 #ifdef ACPI_ASL_COMPILER
27 #include "acdisasm.h"
28 static acpi_status
29 acpi_ds_create_external_region(acpi_status lookup_status,
30 union acpi_parse_object *op,
31 char *path,
32 struct acpi_walk_state *walk_state,
33 struct acpi_namespace_node **node);
34 #endif
35
36 static acpi_status
37 acpi_ds_get_field_names(struct acpi_create_field_info *info,
38 struct acpi_walk_state *walk_state,
39 union acpi_parse_object *arg);
40
41 #ifdef ACPI_ASL_COMPILER
42 /*******************************************************************************
43 *
44 * FUNCTION: acpi_ds_create_external_region (iASL Disassembler only)
45 *
46 * PARAMETERS: lookup_status - Status from ns_lookup operation
47 * op - Op containing the Field definition and args
48 * path - Pathname of the region
49 * ` walk_state - Current method state
50 * node - Where the new region node is returned
51 *
52 * RETURN: Status
53 *
54 * DESCRIPTION: Add region to the external list if NOT_FOUND. Create a new
55 * region node/object.
56 *
57 ******************************************************************************/
58
59 static acpi_status
60 acpi_ds_create_external_region(acpi_status lookup_status,
61 union acpi_parse_object *op,
62 char *path,
63 struct acpi_walk_state *walk_state,
64 struct acpi_namespace_node **node)
65 {
66 acpi_status status;
67 union acpi_operand_object *obj_desc;
68
69 if (lookup_status != AE_NOT_FOUND) {
70 return (lookup_status);
71 }
72
73 /*
74 * Table disassembly:
75 * operation_region not found. Generate an External for it, and
76 * insert the name into the namespace.
77 */
78 acpi_dm_add_op_to_external_list(op, path, ACPI_TYPE_REGION, 0, 0);
79
80 status = acpi_ns_lookup(walk_state->scope_info, path, ACPI_TYPE_REGION,
81 ACPI_IMODE_LOAD_PASS1, ACPI_NS_SEARCH_PARENT,
82 walk_state, node);
83 if (ACPI_FAILURE(status)) {
84 return (status);
85 }
86
87 /* Must create and install a region object for the new node */
88
89 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
90 if (!obj_desc) {
91 return (AE_NO_MEMORY);
92 }
93
94 obj_desc->region.node = *node;
95 status = acpi_ns_attach_object(*node, obj_desc, ACPI_TYPE_REGION);
96 return (status);
97 }
98 #endif
99
100 /*******************************************************************************
101 *
102 * FUNCTION: acpi_ds_create_buffer_field
103 *
104 * PARAMETERS: op - Current parse op (create_XXField)
105 * walk_state - Current state
106 *
107 * RETURN: Status
108 *
109 * DESCRIPTION: Execute the create_field operators:
110 * create_bit_field_op,
111 * create_byte_field_op,
112 * create_word_field_op,
113 * create_dword_field_op,
114 * create_qword_field_op,
115 * create_field_op (all of which define a field in a buffer)
116 *
117 ******************************************************************************/
118
119 acpi_status
120 acpi_ds_create_buffer_field(union acpi_parse_object *op,
121 struct acpi_walk_state *walk_state)
122 {
123 union acpi_parse_object *arg;
124 struct acpi_namespace_node *node;
125 acpi_status status;
126 union acpi_operand_object *obj_desc;
127 union acpi_operand_object *second_desc = NULL;
128 u32 flags;
129
130 ACPI_FUNCTION_TRACE(ds_create_buffer_field);
131
132 /*
133 * Get the name_string argument (name of the new buffer_field)
134 */
135 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
136
137 /* For create_field, name is the 4th argument */
138
139 arg = acpi_ps_get_arg(op, 3);
140 } else {
141 /* For all other create_XXXField operators, name is the 3rd argument */
142
143 arg = acpi_ps_get_arg(op, 2);
144 }
145
146 if (!arg) {
147 return_ACPI_STATUS(AE_AML_NO_OPERAND);
148 }
149
150 if (walk_state->deferred_node) {
151 node = walk_state->deferred_node;
152 status = AE_OK;
153 } else {
154 /* Execute flag should always be set when this function is entered */
155
156 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
157 ACPI_ERROR((AE_INFO, "Parse execute mode is not set"));
158 return_ACPI_STATUS(AE_AML_INTERNAL);
159 }
160
161 /* Creating new namespace node, should not already exist */
162
163 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
164 ACPI_NS_ERROR_IF_FOUND;
165
166 /*
167 * Mark node temporary if we are executing a normal control
168 * method. (Don't mark if this is a module-level code method)
169 */
170 if (walk_state->method_node &&
171 !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
172 flags |= ACPI_NS_TEMPORARY;
173 }
174
175 /* Enter the name_string into the namespace */
176
177 status = acpi_ns_lookup(walk_state->scope_info,
178 arg->common.value.string, ACPI_TYPE_ANY,
179 ACPI_IMODE_LOAD_PASS1, flags,
180 walk_state, &node);
181 if (ACPI_FAILURE(status)) {
182 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
183 arg->common.value.string, status);
184 return_ACPI_STATUS(status);
185 }
186 }
187
188 /*
189 * We could put the returned object (Node) on the object stack for later,
190 * but for now, we will put it in the "op" object that the parser uses,
191 * so we can get it again at the end of this scope.
192 */
193 op->common.node = node;
194
195 /*
196 * If there is no object attached to the node, this node was just created
197 * and we need to create the field object. Otherwise, this was a lookup
198 * of an existing node and we don't want to create the field object again.
199 */
200 obj_desc = acpi_ns_get_attached_object(node);
201 if (obj_desc) {
202 return_ACPI_STATUS(AE_OK);
203 }
204
205 /*
206 * The Field definition is not fully parsed at this time.
207 * (We must save the address of the AML for the buffer and index operands)
208 */
209
210 /* Create the buffer field object */
211
212 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
213 if (!obj_desc) {
214 status = AE_NO_MEMORY;
215 goto cleanup;
216 }
217
218 /*
219 * Remember location in AML stream of the field unit opcode and operands
220 * -- since the buffer and index operands must be evaluated.
221 */
222 second_desc = obj_desc->common.next_object;
223 second_desc->extra.aml_start = op->named.data;
224 second_desc->extra.aml_length = op->named.length;
225 obj_desc->buffer_field.node = node;
226
227 /* Attach constructed field descriptors to parent node */
228
229 status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
230 if (ACPI_FAILURE(status)) {
231 goto cleanup;
232 }
233
234 cleanup:
235
236 /* Remove local reference to the object */
237
238 acpi_ut_remove_reference(obj_desc);
239 return_ACPI_STATUS(status);
240 }
241
242 /*******************************************************************************
243 *
244 * FUNCTION: acpi_ds_get_field_names
245 *
246 * PARAMETERS: info - create_field info structure
247 * walk_state - Current method state
248 * arg - First parser arg for the field name list
249 *
250 * RETURN: Status
251 *
252 * DESCRIPTION: Process all named fields in a field declaration. Names are
253 * entered into the namespace.
254 *
255 ******************************************************************************/
256
257 static acpi_status
258 acpi_ds_get_field_names(struct acpi_create_field_info *info,
259 struct acpi_walk_state *walk_state,
260 union acpi_parse_object *arg)
261 {
262 acpi_status status;
263 u64 position;
264 union acpi_parse_object *child;
265
266 #ifdef ACPI_EXEC_APP
267 u64 value = 0;
268 union acpi_operand_object *result_desc;
269 union acpi_operand_object *obj_desc;
270 char *name_path;
271 #endif
272
273 ACPI_FUNCTION_TRACE_PTR(ds_get_field_names, info);
274
275 /* First field starts at bit zero */
276
277 info->field_bit_position = 0;
278
279 /* Process all elements in the field list (of parse nodes) */
280
281 while (arg) {
282 /*
283 * Four types of field elements are handled:
284 * 1) name - Enters a new named field into the namespace
285 * 2) offset - specifies a bit offset
286 * 3) access_as - changes the access mode/attributes
287 * 4) connection - Associate a resource template with the field
288 */
289 switch (arg->common.aml_opcode) {
290 case AML_INT_RESERVEDFIELD_OP:
291
292 position = (u64)info->field_bit_position +
293 (u64)arg->common.value.size;
294
295 if (position > ACPI_UINT32_MAX) {
296 ACPI_ERROR((AE_INFO,
297 "Bit offset within field too large (> 0xFFFFFFFF)"));
298 return_ACPI_STATUS(AE_SUPPORT);
299 }
300
301 info->field_bit_position = (u32) position;
302 break;
303
304 case AML_INT_ACCESSFIELD_OP:
305 case AML_INT_EXTACCESSFIELD_OP:
306 /*
307 * Get new access_type, access_attribute, and access_length fields
308 * -- to be used for all field units that follow, until the
309 * end-of-field or another access_as keyword is encountered.
310 * NOTE. These three bytes are encoded in the integer value
311 * of the parseop for convenience.
312 *
313 * In field_flags, preserve the flag bits other than the
314 * ACCESS_TYPE bits.
315 */
316
317 /* access_type (byte_acc, word_acc, etc.) */
318
319 info->field_flags = (u8)
320 ((info->
321 field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
322 ((u8)((u32)(arg->common.value.integer & 0x07))));
323
324 /* access_attribute (attrib_quick, attrib_byte, etc.) */
325
326 info->attribute = (u8)
327 ((arg->common.value.integer >> 8) & 0xFF);
328
329 /* access_length (for serial/buffer protocols) */
330
331 info->access_length = (u8)
332 ((arg->common.value.integer >> 16) & 0xFF);
333 break;
334
335 case AML_INT_CONNECTION_OP:
336 /*
337 * Clear any previous connection. New connection is used for all
338 * fields that follow, similar to access_as
339 */
340 info->resource_buffer = NULL;
341 info->connection_node = NULL;
342 info->pin_number_index = 0;
343
344 /*
345 * A Connection() is either an actual resource descriptor (buffer)
346 * or a named reference to a resource template
347 */
348 child = arg->common.value.arg;
349 if (child->common.aml_opcode == AML_INT_BYTELIST_OP) {
350 info->resource_buffer = child->named.data;
351 info->resource_length =
352 (u16)child->named.value.integer;
353 } else {
354 /* Lookup the Connection() namepath, it should already exist */
355
356 status = acpi_ns_lookup(walk_state->scope_info,
357 child->common.value.
358 name, ACPI_TYPE_ANY,
359 ACPI_IMODE_EXECUTE,
360 ACPI_NS_DONT_OPEN_SCOPE,
361 walk_state,
362 &info->connection_node);
363 if (ACPI_FAILURE(status)) {
364 ACPI_ERROR_NAMESPACE(walk_state->
365 scope_info,
366 child->common.
367 value.name,
368 status);
369 return_ACPI_STATUS(status);
370 }
371 }
372 break;
373
374 case AML_INT_NAMEDFIELD_OP:
375
376 /* Lookup the name, it should already exist */
377
378 status = acpi_ns_lookup(walk_state->scope_info,
379 (char *)&arg->named.name,
380 info->field_type,
381 ACPI_IMODE_EXECUTE,
382 ACPI_NS_DONT_OPEN_SCOPE,
383 walk_state, &info->field_node);
384 if (ACPI_FAILURE(status)) {
385 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
386 (char *)&arg->named.name,
387 status);
388 return_ACPI_STATUS(status);
389 } else {
390 arg->common.node = info->field_node;
391 info->field_bit_length = arg->common.value.size;
392
393 /*
394 * If there is no object attached to the node, this node was
395 * just created and we need to create the field object.
396 * Otherwise, this was a lookup of an existing node and we
397 * don't want to create the field object again.
398 */
399 if (!acpi_ns_get_attached_object
400 (info->field_node)) {
401 status = acpi_ex_prep_field_value(info);
402 if (ACPI_FAILURE(status)) {
403 return_ACPI_STATUS(status);
404 }
405 #ifdef ACPI_EXEC_APP
406 name_path =
407 acpi_ns_get_external_pathname(info->
408 field_node);
409 obj_desc =
410 acpi_ut_create_integer_object
411 (value);
412 if (ACPI_SUCCESS
413 (ae_lookup_init_file_entry
414 (name_path, &value))) {
415 acpi_ex_write_data_to_field
416 (obj_desc,
417 acpi_ns_get_attached_object
418 (info->field_node),
419 &result_desc);
420 }
421 acpi_ut_remove_reference(obj_desc);
422 ACPI_FREE(name_path);
423 #endif
424 }
425 }
426
427 /* Keep track of bit position for the next field */
428
429 position = (u64)info->field_bit_position +
430 (u64)arg->common.value.size;
431
432 if (position > ACPI_UINT32_MAX) {
433 ACPI_ERROR((AE_INFO,
434 "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
435 ACPI_CAST_PTR(char,
436 &info->field_node->
437 name)));
438 return_ACPI_STATUS(AE_SUPPORT);
439 }
440
441 info->field_bit_position += info->field_bit_length;
442 info->pin_number_index++; /* Index relative to previous Connection() */
443 break;
444
445 default:
446
447 ACPI_ERROR((AE_INFO,
448 "Invalid opcode in field list: 0x%X",
449 arg->common.aml_opcode));
450 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
451 }
452
453 arg = arg->common.next;
454 }
455
456 return_ACPI_STATUS(AE_OK);
457 }
458
459 /*******************************************************************************
460 *
461 * FUNCTION: acpi_ds_create_field
462 *
463 * PARAMETERS: op - Op containing the Field definition and args
464 * region_node - Object for the containing Operation Region
465 * ` walk_state - Current method state
466 *
467 * RETURN: Status
468 *
469 * DESCRIPTION: Create a new field in the specified operation region
470 *
471 ******************************************************************************/
472
473 acpi_status
474 acpi_ds_create_field(union acpi_parse_object *op,
475 struct acpi_namespace_node *region_node,
476 struct acpi_walk_state *walk_state)
477 {
478 acpi_status status;
479 union acpi_parse_object *arg;
480 struct acpi_create_field_info info;
481
482 ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);
483
484 /* First arg is the name of the parent op_region (must already exist) */
485
486 arg = op->common.value.arg;
487
488 if (!region_node) {
489 status =
490 acpi_ns_lookup(walk_state->scope_info,
491 arg->common.value.name, ACPI_TYPE_REGION,
492 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
493 walk_state, ®ion_node);
494 #ifdef ACPI_ASL_COMPILER
495 status = acpi_ds_create_external_region(status, arg,
496 arg->common.value.name,
497 walk_state,
498 ®ion_node);
499 #endif
500 if (ACPI_FAILURE(status)) {
501 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
502 arg->common.value.name, status);
503 return_ACPI_STATUS(status);
504 }
505 }
506
507 memset(&info, 0, sizeof(struct acpi_create_field_info));
508
509 /* Second arg is the field flags */
510
511 arg = arg->common.next;
512 info.field_flags = (u8) arg->common.value.integer;
513 info.attribute = 0;
514
515 /* Each remaining arg is a Named Field */
516
517 info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
518 info.region_node = region_node;
519
520 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
521 if (info.region_node->object->region.space_id ==
522 ACPI_ADR_SPACE_PLATFORM_COMM
523 && !(region_node->object->field.internal_pcc_buffer =
524 ACPI_ALLOCATE_ZEROED(info.region_node->object->region.
525 length))) {
526 return_ACPI_STATUS(AE_NO_MEMORY);
527 }
528 return_ACPI_STATUS(status);
529 }
530
531 /*******************************************************************************
532 *
533 * FUNCTION: acpi_ds_init_field_objects
534 *
535 * PARAMETERS: op - Op containing the Field definition and args
536 * ` walk_state - Current method state
537 *
538 * RETURN: Status
539 *
540 * DESCRIPTION: For each "Field Unit" name in the argument list that is
541 * part of the field declaration, enter the name into the
542 * namespace.
543 *
544 ******************************************************************************/
545
546 acpi_status
547 acpi_ds_init_field_objects(union acpi_parse_object *op,
548 struct acpi_walk_state *walk_state)
549 {
550 acpi_status status;
551 union acpi_parse_object *arg = NULL;
552 struct acpi_namespace_node *node;
553 u8 type = 0;
554 u32 flags;
555
556 ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
557
558 /* Execute flag should always be set when this function is entered */
559
560 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
561 if (walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP) {
562
563 /* bank_field Op is deferred, just return OK */
564
565 return_ACPI_STATUS(AE_OK);
566 }
567
568 ACPI_ERROR((AE_INFO, "Parse deferred mode is not set"));
569 return_ACPI_STATUS(AE_AML_INTERNAL);
570 }
571
572 /*
573 * Get the field_list argument for this opcode. This is the start of the
574 * list of field elements.
575 */
576 switch (walk_state->opcode) {
577 case AML_FIELD_OP:
578
579 arg = acpi_ps_get_arg(op, 2);
580 type = ACPI_TYPE_LOCAL_REGION_FIELD;
581 break;
582
583 case AML_BANK_FIELD_OP:
584
585 arg = acpi_ps_get_arg(op, 4);
586 type = ACPI_TYPE_LOCAL_BANK_FIELD;
587 break;
588
589 case AML_INDEX_FIELD_OP:
590
591 arg = acpi_ps_get_arg(op, 3);
592 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
593 break;
594
595 default:
596
597 return_ACPI_STATUS(AE_BAD_PARAMETER);
598 }
599
600 /* Creating new namespace node(s), should not already exist */
601
602 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
603 ACPI_NS_ERROR_IF_FOUND;
604
605 /*
606 * Mark node(s) temporary if we are executing a normal control
607 * method. (Don't mark if this is a module-level code method)
608 */
609 if (walk_state->method_node &&
610 !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
611 flags |= ACPI_NS_TEMPORARY;
612 }
613 #ifdef ACPI_EXEC_APP
614 flags |= ACPI_NS_OVERRIDE_IF_FOUND;
615 #endif
616 /*
617 * Walk the list of entries in the field_list
618 * Note: field_list can be of zero length. In this case, Arg will be NULL.
619 */
620 while (arg) {
621 /*
622 * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
623 * in the field names in order to enter them into the namespace.
624 */
625 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
626 status = acpi_ns_lookup(walk_state->scope_info,
627 (char *)&arg->named.name, type,
628 ACPI_IMODE_LOAD_PASS1, flags,
629 walk_state, &node);
630 if (ACPI_FAILURE(status)) {
631 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
632 (char *)&arg->named.name,
633 status);
634 if (status != AE_ALREADY_EXISTS) {
635 return_ACPI_STATUS(status);
636 }
637
638 /* Name already exists, just ignore this error */
639
640 status = AE_OK;
641 }
642
643 arg->common.node = node;
644 }
645
646 /* Get the next field element in the list */
647
648 arg = arg->common.next;
649 }
650
651 return_ACPI_STATUS(AE_OK);
652 }
653
654 /*******************************************************************************
655 *
656 * FUNCTION: acpi_ds_create_bank_field
657 *
658 * PARAMETERS: op - Op containing the Field definition and args
659 * region_node - Object for the containing Operation Region
660 * walk_state - Current method state
661 *
662 * RETURN: Status
663 *
664 * DESCRIPTION: Create a new bank field in the specified operation region
665 *
666 ******************************************************************************/
667
668 acpi_status
669 acpi_ds_create_bank_field(union acpi_parse_object *op,
670 struct acpi_namespace_node *region_node,
671 struct acpi_walk_state *walk_state)
672 {
673 acpi_status status;
674 union acpi_parse_object *arg;
675 struct acpi_create_field_info info;
676
677 ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
678
679 /* First arg is the name of the parent op_region (must already exist) */
680
681 arg = op->common.value.arg;
682 if (!region_node) {
683 status =
684 acpi_ns_lookup(walk_state->scope_info,
685 arg->common.value.name, ACPI_TYPE_REGION,
686 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
687 walk_state, ®ion_node);
688 #ifdef ACPI_ASL_COMPILER
689 status = acpi_ds_create_external_region(status, arg,
690 arg->common.value.name,
691 walk_state,
692 ®ion_node);
693 #endif
694 if (ACPI_FAILURE(status)) {
695 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
696 arg->common.value.name, status);
697 return_ACPI_STATUS(status);
698 }
699 }
700
701 /* Second arg is the Bank Register (Field) (must already exist) */
702
703 arg = arg->common.next;
704 status =
705 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
706 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
707 ACPI_NS_SEARCH_PARENT, walk_state,
708 &info.register_node);
709 if (ACPI_FAILURE(status)) {
710 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
711 arg->common.value.string, status);
712 return_ACPI_STATUS(status);
713 }
714
715 /*
716 * Third arg is the bank_value
717 * This arg is a term_arg, not a constant
718 * It will be evaluated later, by acpi_ds_eval_bank_field_operands
719 */
720 arg = arg->common.next;
721
722 /* Fourth arg is the field flags */
723
724 arg = arg->common.next;
725 info.field_flags = (u8) arg->common.value.integer;
726
727 /* Each remaining arg is a Named Field */
728
729 info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
730 info.region_node = region_node;
731
732 /*
733 * Use Info.data_register_node to store bank_field Op
734 * It's safe because data_register_node will never be used when create
735 * bank field \we store aml_start and aml_length in the bank_field Op for
736 * late evaluation. Used in acpi_ex_prep_field_value(Info)
737 *
738 * TBD: Or, should we add a field in struct acpi_create_field_info, like
739 * "void *ParentOp"?
740 */
741 info.data_register_node = (struct acpi_namespace_node *)op;
742
743 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
744 return_ACPI_STATUS(status);
745 }
746
747 /*******************************************************************************
748 *
749 * FUNCTION: acpi_ds_create_index_field
750 *
751 * PARAMETERS: op - Op containing the Field definition and args
752 * region_node - Object for the containing Operation Region
753 * ` walk_state - Current method state
754 *
755 * RETURN: Status
756 *
757 * DESCRIPTION: Create a new index field in the specified operation region
758 *
759 ******************************************************************************/
760
761 acpi_status
762 acpi_ds_create_index_field(union acpi_parse_object *op,
763 struct acpi_namespace_node *region_node,
764 struct acpi_walk_state *walk_state)
765 {
766 acpi_status status;
767 union acpi_parse_object *arg;
768 struct acpi_create_field_info info;
769
770 ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
771
772 /* First arg is the name of the Index register (must already exist) */
773
774 arg = op->common.value.arg;
775 status =
776 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
777 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
778 ACPI_NS_SEARCH_PARENT, walk_state,
779 &info.register_node);
780 if (ACPI_FAILURE(status)) {
781 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
782 arg->common.value.string, status);
783 return_ACPI_STATUS(status);
784 }
785
786 /* Second arg is the data register (must already exist) */
787
788 arg = arg->common.next;
789 status =
790 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
791 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
792 ACPI_NS_SEARCH_PARENT, walk_state,
793 &info.data_register_node);
794 if (ACPI_FAILURE(status)) {
795 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
796 arg->common.value.string, status);
797 return_ACPI_STATUS(status);
798 }
799
800 /* Next arg is the field flags */
801
802 arg = arg->common.next;
803 info.field_flags = (u8) arg->common.value.integer;
804
805 /* Each remaining arg is a Named Field */
806
807 info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
808 info.region_node = region_node;
809
810 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
811 return_ACPI_STATUS(status);
812 }