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Linux 4.1.16
[linux/fpc-iii.git] / drivers / acpi / acpica / dsfield.c
blob43b40de90484cbb9f44338bb2d74dbb4bf4af291
1 /******************************************************************************
2 *
3 * Module Name: dsfield - Dispatcher field routines
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2015, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "amlcode.h"
47 #include "acdispat.h"
48 #include "acinterp.h"
49 #include "acnamesp.h"
50 #include "acparser.h"
51
52 #define _COMPONENT ACPI_DISPATCHER
53 ACPI_MODULE_NAME("dsfield")
54
55 /* Local prototypes */
56 #ifdef ACPI_ASL_COMPILER
57 #include "acdisasm.h"
58 static acpi_status
59 acpi_ds_create_external_region(acpi_status lookup_status,
60 union acpi_parse_object *op,
61 char *path,
62 struct acpi_walk_state *walk_state,
63 struct acpi_namespace_node **node);
64 #endif
65
66 static acpi_status
67 acpi_ds_get_field_names(struct acpi_create_field_info *info,
68 struct acpi_walk_state *walk_state,
69 union acpi_parse_object *arg);
70
71 #ifdef ACPI_ASL_COMPILER
72 /*******************************************************************************
73 *
74 * FUNCTION: acpi_ds_create_external_region (iASL Disassembler only)
75 *
76 * PARAMETERS: lookup_status - Status from ns_lookup operation
77 * op - Op containing the Field definition and args
78 * path - Pathname of the region
79 * ` walk_state - Current method state
80 * node - Where the new region node is returned
81 *
82 * RETURN: Status
83 *
84 * DESCRIPTION: Add region to the external list if NOT_FOUND. Create a new
85 * region node/object.
86 *
87 ******************************************************************************/
88
89 static acpi_status
90 acpi_ds_create_external_region(acpi_status lookup_status,
91 union acpi_parse_object *op,
92 char *path,
93 struct acpi_walk_state *walk_state,
94 struct acpi_namespace_node **node)
95 {
96 acpi_status status;
97 union acpi_operand_object *obj_desc;
98
99 if (lookup_status != AE_NOT_FOUND) {
100 return (lookup_status);
101 }
102
103 /*
104 * Table disassembly:
105 * operation_region not found. Generate an External for it, and
106 * insert the name into the namespace.
107 */
108 acpi_dm_add_op_to_external_list(op, path, ACPI_TYPE_REGION, 0, 0);
109 status = acpi_ns_lookup(walk_state->scope_info, path, ACPI_TYPE_REGION,
110 ACPI_IMODE_LOAD_PASS1, ACPI_NS_SEARCH_PARENT,
111 walk_state, node);
112 if (ACPI_FAILURE(status)) {
113 return (status);
114 }
115
116 /* Must create and install a region object for the new node */
117
118 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
119 if (!obj_desc) {
120 return (AE_NO_MEMORY);
121 }
122
123 obj_desc->region.node = *node;
124 status = acpi_ns_attach_object(*node, obj_desc, ACPI_TYPE_REGION);
125 return (status);
126 }
127 #endif
128
129 /*******************************************************************************
130 *
131 * FUNCTION: acpi_ds_create_buffer_field
132 *
133 * PARAMETERS: op - Current parse op (create_XXField)
134 * walk_state - Current state
135 *
136 * RETURN: Status
137 *
138 * DESCRIPTION: Execute the create_field operators:
139 * create_bit_field_op,
140 * create_byte_field_op,
141 * create_word_field_op,
142 * create_dword_field_op,
143 * create_qword_field_op,
144 * create_field_op (all of which define a field in a buffer)
145 *
146 ******************************************************************************/
147
148 acpi_status
149 acpi_ds_create_buffer_field(union acpi_parse_object *op,
150 struct acpi_walk_state *walk_state)
151 {
152 union acpi_parse_object *arg;
153 struct acpi_namespace_node *node;
154 acpi_status status;
155 union acpi_operand_object *obj_desc;
156 union acpi_operand_object *second_desc = NULL;
157 u32 flags;
158
159 ACPI_FUNCTION_TRACE(ds_create_buffer_field);
160
161 /*
162 * Get the name_string argument (name of the new buffer_field)
163 */
164 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
165
166 /* For create_field, name is the 4th argument */
167
168 arg = acpi_ps_get_arg(op, 3);
169 } else {
170 /* For all other create_XXXField operators, name is the 3rd argument */
171
172 arg = acpi_ps_get_arg(op, 2);
173 }
174
175 if (!arg) {
176 return_ACPI_STATUS(AE_AML_NO_OPERAND);
177 }
178
179 if (walk_state->deferred_node) {
180 node = walk_state->deferred_node;
181 status = AE_OK;
182 } else {
183 /* Execute flag should always be set when this function is entered */
184
185 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
186 return_ACPI_STATUS(AE_AML_INTERNAL);
187 }
188
189 /* Creating new namespace node, should not already exist */
190
191 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
192 ACPI_NS_ERROR_IF_FOUND;
193
194 /*
195 * Mark node temporary if we are executing a normal control
196 * method. (Don't mark if this is a module-level code method)
197 */
198 if (walk_state->method_node &&
199 !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
200 flags |= ACPI_NS_TEMPORARY;
201 }
202
203 /* Enter the name_string into the namespace */
204
205 status =
206 acpi_ns_lookup(walk_state->scope_info,
207 arg->common.value.string, ACPI_TYPE_ANY,
208 ACPI_IMODE_LOAD_PASS1, flags, walk_state,
209 &node);
210 if (ACPI_FAILURE(status)) {
211 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
212 return_ACPI_STATUS(status);
213 }
214 }
215
216 /*
217 * We could put the returned object (Node) on the object stack for later,
218 * but for now, we will put it in the "op" object that the parser uses,
219 * so we can get it again at the end of this scope.
220 */
221 op->common.node = node;
222
223 /*
224 * If there is no object attached to the node, this node was just created
225 * and we need to create the field object. Otherwise, this was a lookup
226 * of an existing node and we don't want to create the field object again.
227 */
228 obj_desc = acpi_ns_get_attached_object(node);
229 if (obj_desc) {
230 return_ACPI_STATUS(AE_OK);
231 }
232
233 /*
234 * The Field definition is not fully parsed at this time.
235 * (We must save the address of the AML for the buffer and index operands)
236 */
237
238 /* Create the buffer field object */
239
240 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
241 if (!obj_desc) {
242 status = AE_NO_MEMORY;
243 goto cleanup;
244 }
245
246 /*
247 * Remember location in AML stream of the field unit opcode and operands --
248 * since the buffer and index operands must be evaluated.
249 */
250 second_desc = obj_desc->common.next_object;
251 second_desc->extra.aml_start = op->named.data;
252 second_desc->extra.aml_length = op->named.length;
253 obj_desc->buffer_field.node = node;
254
255 /* Attach constructed field descriptors to parent node */
256
257 status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
258 if (ACPI_FAILURE(status)) {
259 goto cleanup;
260 }
261
262 cleanup:
263
264 /* Remove local reference to the object */
265
266 acpi_ut_remove_reference(obj_desc);
267 return_ACPI_STATUS(status);
268 }
269
270 /*******************************************************************************
271 *
272 * FUNCTION: acpi_ds_get_field_names
273 *
274 * PARAMETERS: info - create_field info structure
275 * ` walk_state - Current method state
276 * arg - First parser arg for the field name list
277 *
278 * RETURN: Status
279 *
280 * DESCRIPTION: Process all named fields in a field declaration. Names are
281 * entered into the namespace.
282 *
283 ******************************************************************************/
284
285 static acpi_status
286 acpi_ds_get_field_names(struct acpi_create_field_info *info,
287 struct acpi_walk_state *walk_state,
288 union acpi_parse_object *arg)
289 {
290 acpi_status status;
291 u64 position;
292 union acpi_parse_object *child;
293
294 ACPI_FUNCTION_TRACE_PTR(ds_get_field_names, info);
295
296 /* First field starts at bit zero */
297
298 info->field_bit_position = 0;
299
300 /* Process all elements in the field list (of parse nodes) */
301
302 while (arg) {
303 /*
304 * Four types of field elements are handled:
305 * 1) name - Enters a new named field into the namespace
306 * 2) offset - specifies a bit offset
307 * 3) access_as - changes the access mode/attributes
308 * 4) connection - Associate a resource template with the field
309 */
310 switch (arg->common.aml_opcode) {
311 case AML_INT_RESERVEDFIELD_OP:
312
313 position = (u64) info->field_bit_position
314 + (u64) arg->common.value.size;
315
316 if (position > ACPI_UINT32_MAX) {
317 ACPI_ERROR((AE_INFO,
318 "Bit offset within field too large (> 0xFFFFFFFF)"));
319 return_ACPI_STATUS(AE_SUPPORT);
320 }
321
322 info->field_bit_position = (u32) position;
323 break;
324
325 case AML_INT_ACCESSFIELD_OP:
326 case AML_INT_EXTACCESSFIELD_OP:
327 /*
328 * Get new access_type, access_attribute, and access_length fields
329 * -- to be used for all field units that follow, until the
330 * end-of-field or another access_as keyword is encountered.
331 * NOTE. These three bytes are encoded in the integer value
332 * of the parseop for convenience.
333 *
334 * In field_flags, preserve the flag bits other than the
335 * ACCESS_TYPE bits.
336 */
337
338 /* access_type (byte_acc, word_acc, etc.) */
339
340 info->field_flags = (u8)
341 ((info->
342 field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
343 ((u8)((u32)(arg->common.value.integer & 0x07))));
344
345 /* access_attribute (attrib_quick, attrib_byte, etc.) */
346
347 info->attribute =
348 (u8)((arg->common.value.integer >> 8) & 0xFF);
349
350 /* access_length (for serial/buffer protocols) */
351
352 info->access_length =
353 (u8)((arg->common.value.integer >> 16) & 0xFF);
354 break;
355
356 case AML_INT_CONNECTION_OP:
357 /*
358 * Clear any previous connection. New connection is used for all
359 * fields that follow, similar to access_as
360 */
361 info->resource_buffer = NULL;
362 info->connection_node = NULL;
363 info->pin_number_index = 0;
364
365 /*
366 * A Connection() is either an actual resource descriptor (buffer)
367 * or a named reference to a resource template
368 */
369 child = arg->common.value.arg;
370 if (child->common.aml_opcode == AML_INT_BYTELIST_OP) {
371 info->resource_buffer = child->named.data;
372 info->resource_length =
373 (u16)child->named.value.integer;
374 } else {
375 /* Lookup the Connection() namepath, it should already exist */
376
377 status = acpi_ns_lookup(walk_state->scope_info,
378 child->common.value.
379 name, ACPI_TYPE_ANY,
380 ACPI_IMODE_EXECUTE,
381 ACPI_NS_DONT_OPEN_SCOPE,
382 walk_state,
383 &info->connection_node);
384 if (ACPI_FAILURE(status)) {
385 ACPI_ERROR_NAMESPACE(child->common.
386 value.name,
387 status);
388 return_ACPI_STATUS(status);
389 }
390 }
391 break;
392
393 case AML_INT_NAMEDFIELD_OP:
394
395 /* Lookup the name, it should already exist */
396
397 status = acpi_ns_lookup(walk_state->scope_info,
398 (char *)&arg->named.name,
399 info->field_type,
400 ACPI_IMODE_EXECUTE,
401 ACPI_NS_DONT_OPEN_SCOPE,
402 walk_state, &info->field_node);
403 if (ACPI_FAILURE(status)) {
404 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
405 status);
406 return_ACPI_STATUS(status);
407 } else {
408 arg->common.node = info->field_node;
409 info->field_bit_length = arg->common.value.size;
410
411 /*
412 * If there is no object attached to the node, this node was
413 * just created and we need to create the field object.
414 * Otherwise, this was a lookup of an existing node and we
415 * don't want to create the field object again.
416 */
417 if (!acpi_ns_get_attached_object
418 (info->field_node)) {
419 status = acpi_ex_prep_field_value(info);
420 if (ACPI_FAILURE(status)) {
421 return_ACPI_STATUS(status);
422 }
423 }
424 }
425
426 /* Keep track of bit position for the next field */
427
428 position = (u64) info->field_bit_position
429 + (u64) arg->common.value.size;
430
431 if (position > ACPI_UINT32_MAX) {
432 ACPI_ERROR((AE_INFO,
433 "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
434 ACPI_CAST_PTR(char,
435 &info->field_node->
436 name)));
437 return_ACPI_STATUS(AE_SUPPORT);
438 }
439
440 info->field_bit_position += info->field_bit_length;
441 info->pin_number_index++; /* Index relative to previous Connection() */
442 break;
443
444 default:
445
446 ACPI_ERROR((AE_INFO,
447 "Invalid opcode in field list: 0x%X",
448 arg->common.aml_opcode));
449 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
450 }
451
452 arg = arg->common.next;
453 }
454
455 return_ACPI_STATUS(AE_OK);
456 }
457
458 /*******************************************************************************
459 *
460 * FUNCTION: acpi_ds_create_field
461 *
462 * PARAMETERS: op - Op containing the Field definition and args
463 * region_node - Object for the containing Operation Region
464 * ` walk_state - Current method state
465 *
466 * RETURN: Status
467 *
468 * DESCRIPTION: Create a new field in the specified operation region
469 *
470 ******************************************************************************/
471
472 acpi_status
473 acpi_ds_create_field(union acpi_parse_object *op,
474 struct acpi_namespace_node *region_node,
475 struct acpi_walk_state *walk_state)
476 {
477 acpi_status status;
478 union acpi_parse_object *arg;
479 struct acpi_create_field_info info;
480
481 ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);
482
483 /* First arg is the name of the parent op_region (must already exist) */
484
485 arg = op->common.value.arg;
486
487 if (!region_node) {
488 status =
489 acpi_ns_lookup(walk_state->scope_info,
490 arg->common.value.name, ACPI_TYPE_REGION,
491 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
492 walk_state, &region_node);
493 #ifdef ACPI_ASL_COMPILER
494 status = acpi_ds_create_external_region(status, arg,
495 arg->common.value.name,
496 walk_state,
497 &region_node);
498 #endif
499 if (ACPI_FAILURE(status)) {
500 ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
501 return_ACPI_STATUS(status);
502 }
503 }
504
505 ACPI_MEMSET(&info, 0, sizeof(struct acpi_create_field_info));
506
507 /* Second arg is the field flags */
508
509 arg = arg->common.next;
510 info.field_flags = (u8) arg->common.value.integer;
511 info.attribute = 0;
512
513 /* Each remaining arg is a Named Field */
514
515 info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
516 info.region_node = region_node;
517
518 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
519 return_ACPI_STATUS(status);
520 }
521
522 /*******************************************************************************
523 *
524 * FUNCTION: acpi_ds_init_field_objects
525 *
526 * PARAMETERS: op - Op containing the Field definition and args
527 * ` walk_state - Current method state
528 *
529 * RETURN: Status
530 *
531 * DESCRIPTION: For each "Field Unit" name in the argument list that is
532 * part of the field declaration, enter the name into the
533 * namespace.
534 *
535 ******************************************************************************/
536
537 acpi_status
538 acpi_ds_init_field_objects(union acpi_parse_object *op,
539 struct acpi_walk_state *walk_state)
540 {
541 acpi_status status;
542 union acpi_parse_object *arg = NULL;
543 struct acpi_namespace_node *node;
544 u8 type = 0;
545 u32 flags;
546
547 ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
548
549 /* Execute flag should always be set when this function is entered */
550
551 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
552 if (walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP) {
553
554 /* bank_field Op is deferred, just return OK */
555
556 return_ACPI_STATUS(AE_OK);
557 }
558
559 return_ACPI_STATUS(AE_AML_INTERNAL);
560 }
561
562 /*
563 * Get the field_list argument for this opcode. This is the start of the
564 * list of field elements.
565 */
566 switch (walk_state->opcode) {
567 case AML_FIELD_OP:
568
569 arg = acpi_ps_get_arg(op, 2);
570 type = ACPI_TYPE_LOCAL_REGION_FIELD;
571 break;
572
573 case AML_BANK_FIELD_OP:
574
575 arg = acpi_ps_get_arg(op, 4);
576 type = ACPI_TYPE_LOCAL_BANK_FIELD;
577 break;
578
579 case AML_INDEX_FIELD_OP:
580
581 arg = acpi_ps_get_arg(op, 3);
582 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
583 break;
584
585 default:
586
587 return_ACPI_STATUS(AE_BAD_PARAMETER);
588 }
589
590 /* Creating new namespace node(s), should not already exist */
591
592 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
593 ACPI_NS_ERROR_IF_FOUND;
594
595 /*
596 * Mark node(s) temporary if we are executing a normal control
597 * method. (Don't mark if this is a module-level code method)
598 */
599 if (walk_state->method_node &&
600 !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
601 flags |= ACPI_NS_TEMPORARY;
602 }
603
604 /*
605 * Walk the list of entries in the field_list
606 * Note: field_list can be of zero length. In this case, Arg will be NULL.
607 */
608 while (arg) {
609 /*
610 * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
611 * in the field names in order to enter them into the namespace.
612 */
613 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
614 status = acpi_ns_lookup(walk_state->scope_info,
615 (char *)&arg->named.name, type,
616 ACPI_IMODE_LOAD_PASS1, flags,
617 walk_state, &node);
618 if (ACPI_FAILURE(status)) {
619 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
620 status);
621 if (status != AE_ALREADY_EXISTS) {
622 return_ACPI_STATUS(status);
623 }
624
625 /* Name already exists, just ignore this error */
626
627 status = AE_OK;
628 }
629
630 arg->common.node = node;
631 }
632
633 /* Get the next field element in the list */
634
635 arg = arg->common.next;
636 }
637
638 return_ACPI_STATUS(AE_OK);
639 }
640
641 /*******************************************************************************
642 *
643 * FUNCTION: acpi_ds_create_bank_field
644 *
645 * PARAMETERS: op - Op containing the Field definition and args
646 * region_node - Object for the containing Operation Region
647 * walk_state - Current method state
648 *
649 * RETURN: Status
650 *
651 * DESCRIPTION: Create a new bank field in the specified operation region
652 *
653 ******************************************************************************/
654
655 acpi_status
656 acpi_ds_create_bank_field(union acpi_parse_object *op,
657 struct acpi_namespace_node *region_node,
658 struct acpi_walk_state *walk_state)
659 {
660 acpi_status status;
661 union acpi_parse_object *arg;
662 struct acpi_create_field_info info;
663
664 ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
665
666 /* First arg is the name of the parent op_region (must already exist) */
667
668 arg = op->common.value.arg;
669 if (!region_node) {
670 status =
671 acpi_ns_lookup(walk_state->scope_info,
672 arg->common.value.name, ACPI_TYPE_REGION,
673 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
674 walk_state, &region_node);
675 #ifdef ACPI_ASL_COMPILER
676 status = acpi_ds_create_external_region(status, arg,
677 arg->common.value.name,
678 walk_state,
679 &region_node);
680 #endif
681 if (ACPI_FAILURE(status)) {
682 ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
683 return_ACPI_STATUS(status);
684 }
685 }
686
687 /* Second arg is the Bank Register (Field) (must already exist) */
688
689 arg = arg->common.next;
690 status =
691 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
692 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
693 ACPI_NS_SEARCH_PARENT, walk_state,
694 &info.register_node);
695 if (ACPI_FAILURE(status)) {
696 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
697 return_ACPI_STATUS(status);
698 }
699
700 /*
701 * Third arg is the bank_value
702 * This arg is a term_arg, not a constant
703 * It will be evaluated later, by acpi_ds_eval_bank_field_operands
704 */
705 arg = arg->common.next;
706
707 /* Fourth arg is the field flags */
708
709 arg = arg->common.next;
710 info.field_flags = (u8) arg->common.value.integer;
711
712 /* Each remaining arg is a Named Field */
713
714 info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
715 info.region_node = region_node;
716
717 /*
718 * Use Info.data_register_node to store bank_field Op
719 * It's safe because data_register_node will never be used when create bank field
720 * We store aml_start and aml_length in the bank_field Op for late evaluation
721 * Used in acpi_ex_prep_field_value(Info)
722 *
723 * TBD: Or, should we add a field in struct acpi_create_field_info, like "void *ParentOp"?
724 */
725 info.data_register_node = (struct acpi_namespace_node *)op;
726
727 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
728 return_ACPI_STATUS(status);
729 }
730
731 /*******************************************************************************
732 *
733 * FUNCTION: acpi_ds_create_index_field
734 *
735 * PARAMETERS: op - Op containing the Field definition and args
736 * region_node - Object for the containing Operation Region
737 * ` walk_state - Current method state
738 *
739 * RETURN: Status
740 *
741 * DESCRIPTION: Create a new index field in the specified operation region
742 *
743 ******************************************************************************/
744
745 acpi_status
746 acpi_ds_create_index_field(union acpi_parse_object *op,
747 struct acpi_namespace_node *region_node,
748 struct acpi_walk_state *walk_state)
749 {
750 acpi_status status;
751 union acpi_parse_object *arg;
752 struct acpi_create_field_info info;
753
754 ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
755
756 /* First arg is the name of the Index register (must already exist) */
757
758 arg = op->common.value.arg;
759 status =
760 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
761 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
762 ACPI_NS_SEARCH_PARENT, walk_state,
763 &info.register_node);
764 if (ACPI_FAILURE(status)) {
765 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
766 return_ACPI_STATUS(status);
767 }
768
769 /* Second arg is the data register (must already exist) */
770
771 arg = arg->common.next;
772 status =
773 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
774 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
775 ACPI_NS_SEARCH_PARENT, walk_state,
776 &info.data_register_node);
777 if (ACPI_FAILURE(status)) {
778 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
779 return_ACPI_STATUS(status);
780 }
781
782 /* Next arg is the field flags */
783
784 arg = arg->common.next;
785 info.field_flags = (u8) arg->common.value.integer;
786
787 /* Each remaining arg is a Named Field */
788
789 info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
790 info.region_node = region_node;
791
792 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
793 return_ACPI_STATUS(status);
794 }
Linux with added FPC-III support