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Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux
[linux-2.6.git] / drivers / acpi / acpica / dsfield.c
blobd4bfe7b7f90a54a5b5cdafb8119f0d60698be171
1 /******************************************************************************
2 *
3 * Module Name: dsfield - Dispatcher field routines
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, 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_to_external_list(op, path, ACPI_TYPE_REGION, 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
364 /*
365 * A Connection() is either an actual resource descriptor (buffer)
366 * or a named reference to a resource template
367 */
368 child = arg->common.value.arg;
369 if (child->common.aml_opcode == AML_INT_BYTELIST_OP) {
370 info->resource_buffer = child->named.data;
371 info->resource_length =
372 (u16)child->named.value.integer;
373 } else {
374 /* Lookup the Connection() namepath, it should already exist */
375
376 status = acpi_ns_lookup(walk_state->scope_info,
377 child->common.value.
378 name, ACPI_TYPE_ANY,
379 ACPI_IMODE_EXECUTE,
380 ACPI_NS_DONT_OPEN_SCOPE,
381 walk_state,
382 &info->connection_node);
383 if (ACPI_FAILURE(status)) {
384 ACPI_ERROR_NAMESPACE(child->common.
385 value.name,
386 status);
387 return_ACPI_STATUS(status);
388 }
389 }
390 break;
391
392 case AML_INT_NAMEDFIELD_OP:
393
394 /* Lookup the name, it should already exist */
395
396 status = acpi_ns_lookup(walk_state->scope_info,
397 (char *)&arg->named.name,
398 info->field_type,
399 ACPI_IMODE_EXECUTE,
400 ACPI_NS_DONT_OPEN_SCOPE,
401 walk_state, &info->field_node);
402 if (ACPI_FAILURE(status)) {
403 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
404 status);
405 return_ACPI_STATUS(status);
406 } else {
407 arg->common.node = info->field_node;
408 info->field_bit_length = arg->common.value.size;
409
410 /*
411 * If there is no object attached to the node, this node was
412 * just created and we need to create the field object.
413 * Otherwise, this was a lookup of an existing node and we
414 * don't want to create the field object again.
415 */
416 if (!acpi_ns_get_attached_object
417 (info->field_node)) {
418 status = acpi_ex_prep_field_value(info);
419 if (ACPI_FAILURE(status)) {
420 return_ACPI_STATUS(status);
421 }
422 }
423 }
424
425 /* Keep track of bit position for the next field */
426
427 position = (u64) info->field_bit_position
428 + (u64) arg->common.value.size;
429
430 if (position > ACPI_UINT32_MAX) {
431 ACPI_ERROR((AE_INFO,
432 "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
433 ACPI_CAST_PTR(char,
434 &info->field_node->
435 name)));
436 return_ACPI_STATUS(AE_SUPPORT);
437 }
438
439 info->field_bit_position += info->field_bit_length;
440 break;
441
442 default:
443
444 ACPI_ERROR((AE_INFO,
445 "Invalid opcode in field list: 0x%X",
446 arg->common.aml_opcode));
447 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
448 }
449
450 arg = arg->common.next;
451 }
452
453 return_ACPI_STATUS(AE_OK);
454 }
455
456 /*******************************************************************************
457 *
458 * FUNCTION: acpi_ds_create_field
459 *
460 * PARAMETERS: op - Op containing the Field definition and args
461 * region_node - Object for the containing Operation Region
462 * ` walk_state - Current method state
463 *
464 * RETURN: Status
465 *
466 * DESCRIPTION: Create a new field in the specified operation region
467 *
468 ******************************************************************************/
469
470 acpi_status
471 acpi_ds_create_field(union acpi_parse_object *op,
472 struct acpi_namespace_node *region_node,
473 struct acpi_walk_state *walk_state)
474 {
475 acpi_status status;
476 union acpi_parse_object *arg;
477 struct acpi_create_field_info info;
478
479 ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);
480
481 /* First arg is the name of the parent op_region (must already exist) */
482
483 arg = op->common.value.arg;
484
485 if (!region_node) {
486 status =
487 acpi_ns_lookup(walk_state->scope_info,
488 arg->common.value.name, ACPI_TYPE_REGION,
489 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
490 walk_state, &region_node);
491 #ifdef ACPI_ASL_COMPILER
492 status = acpi_ds_create_external_region(status, arg,
493 arg->common.value.name,
494 walk_state,
495 &region_node);
496 #endif
497 if (ACPI_FAILURE(status)) {
498 ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
499 return_ACPI_STATUS(status);
500 }
501 }
502
503 ACPI_MEMSET(&info, 0, sizeof(struct acpi_create_field_info));
504
505 /* Second arg is the field flags */
506
507 arg = arg->common.next;
508 info.field_flags = (u8) arg->common.value.integer;
509 info.attribute = 0;
510
511 /* Each remaining arg is a Named Field */
512
513 info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
514 info.region_node = region_node;
515
516 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
517 return_ACPI_STATUS(status);
518 }
519
520 /*******************************************************************************
521 *
522 * FUNCTION: acpi_ds_init_field_objects
523 *
524 * PARAMETERS: op - Op containing the Field definition and args
525 * ` walk_state - Current method state
526 *
527 * RETURN: Status
528 *
529 * DESCRIPTION: For each "Field Unit" name in the argument list that is
530 * part of the field declaration, enter the name into the
531 * namespace.
532 *
533 ******************************************************************************/
534
535 acpi_status
536 acpi_ds_init_field_objects(union acpi_parse_object *op,
537 struct acpi_walk_state *walk_state)
538 {
539 acpi_status status;
540 union acpi_parse_object *arg = NULL;
541 struct acpi_namespace_node *node;
542 u8 type = 0;
543 u32 flags;
544
545 ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
546
547 /* Execute flag should always be set when this function is entered */
548
549 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
550 if (walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP) {
551
552 /* bank_field Op is deferred, just return OK */
553
554 return_ACPI_STATUS(AE_OK);
555 }
556
557 return_ACPI_STATUS(AE_AML_INTERNAL);
558 }
559
560 /*
561 * Get the field_list argument for this opcode. This is the start of the
562 * list of field elements.
563 */
564 switch (walk_state->opcode) {
565 case AML_FIELD_OP:
566
567 arg = acpi_ps_get_arg(op, 2);
568 type = ACPI_TYPE_LOCAL_REGION_FIELD;
569 break;
570
571 case AML_BANK_FIELD_OP:
572
573 arg = acpi_ps_get_arg(op, 4);
574 type = ACPI_TYPE_LOCAL_BANK_FIELD;
575 break;
576
577 case AML_INDEX_FIELD_OP:
578
579 arg = acpi_ps_get_arg(op, 3);
580 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
581 break;
582
583 default:
584
585 return_ACPI_STATUS(AE_BAD_PARAMETER);
586 }
587
588 /* Creating new namespace node(s), should not already exist */
589
590 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
591 ACPI_NS_ERROR_IF_FOUND;
592
593 /*
594 * Mark node(s) temporary if we are executing a normal control
595 * method. (Don't mark if this is a module-level code method)
596 */
597 if (walk_state->method_node &&
598 !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
599 flags |= ACPI_NS_TEMPORARY;
600 }
601
602 /*
603 * Walk the list of entries in the field_list
604 * Note: field_list can be of zero length. In this case, Arg will be NULL.
605 */
606 while (arg) {
607 /*
608 * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
609 * in the field names in order to enter them into the namespace.
610 */
611 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
612 status = acpi_ns_lookup(walk_state->scope_info,
613 (char *)&arg->named.name, type,
614 ACPI_IMODE_LOAD_PASS1, flags,
615 walk_state, &node);
616 if (ACPI_FAILURE(status)) {
617 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
618 status);
619 if (status != AE_ALREADY_EXISTS) {
620 return_ACPI_STATUS(status);
621 }
622
623 /* Name already exists, just ignore this error */
624
625 status = AE_OK;
626 }
627
628 arg->common.node = node;
629 }
630
631 /* Get the next field element in the list */
632
633 arg = arg->common.next;
634 }
635
636 return_ACPI_STATUS(AE_OK);
637 }
638
639 /*******************************************************************************
640 *
641 * FUNCTION: acpi_ds_create_bank_field
642 *
643 * PARAMETERS: op - Op containing the Field definition and args
644 * region_node - Object for the containing Operation Region
645 * walk_state - Current method state
646 *
647 * RETURN: Status
648 *
649 * DESCRIPTION: Create a new bank field in the specified operation region
650 *
651 ******************************************************************************/
652
653 acpi_status
654 acpi_ds_create_bank_field(union acpi_parse_object *op,
655 struct acpi_namespace_node *region_node,
656 struct acpi_walk_state *walk_state)
657 {
658 acpi_status status;
659 union acpi_parse_object *arg;
660 struct acpi_create_field_info info;
661
662 ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
663
664 /* First arg is the name of the parent op_region (must already exist) */
665
666 arg = op->common.value.arg;
667 if (!region_node) {
668 status =
669 acpi_ns_lookup(walk_state->scope_info,
670 arg->common.value.name, ACPI_TYPE_REGION,
671 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
672 walk_state, &region_node);
673 #ifdef ACPI_ASL_COMPILER
674 status = acpi_ds_create_external_region(status, arg,
675 arg->common.value.name,
676 walk_state,
677 &region_node);
678 #endif
679 if (ACPI_FAILURE(status)) {
680 ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
681 return_ACPI_STATUS(status);
682 }
683 }
684
685 /* Second arg is the Bank Register (Field) (must already exist) */
686
687 arg = arg->common.next;
688 status =
689 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
690 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
691 ACPI_NS_SEARCH_PARENT, walk_state,
692 &info.register_node);
693 if (ACPI_FAILURE(status)) {
694 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
695 return_ACPI_STATUS(status);
696 }
697
698 /*
699 * Third arg is the bank_value
700 * This arg is a term_arg, not a constant
701 * It will be evaluated later, by acpi_ds_eval_bank_field_operands
702 */
703 arg = arg->common.next;
704
705 /* Fourth arg is the field flags */
706
707 arg = arg->common.next;
708 info.field_flags = (u8) arg->common.value.integer;
709
710 /* Each remaining arg is a Named Field */
711
712 info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
713 info.region_node = region_node;
714
715 /*
716 * Use Info.data_register_node to store bank_field Op
717 * It's safe because data_register_node will never be used when create bank field
718 * We store aml_start and aml_length in the bank_field Op for late evaluation
719 * Used in acpi_ex_prep_field_value(Info)
720 *
721 * TBD: Or, should we add a field in struct acpi_create_field_info, like "void *ParentOp"?
722 */
723 info.data_register_node = (struct acpi_namespace_node *)op;
724
725 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
726 return_ACPI_STATUS(status);
727 }
728
729 /*******************************************************************************
730 *
731 * FUNCTION: acpi_ds_create_index_field
732 *
733 * PARAMETERS: op - Op containing the Field definition and args
734 * region_node - Object for the containing Operation Region
735 * ` walk_state - Current method state
736 *
737 * RETURN: Status
738 *
739 * DESCRIPTION: Create a new index field in the specified operation region
740 *
741 ******************************************************************************/
742
743 acpi_status
744 acpi_ds_create_index_field(union acpi_parse_object *op,
745 struct acpi_namespace_node *region_node,
746 struct acpi_walk_state *walk_state)
747 {
748 acpi_status status;
749 union acpi_parse_object *arg;
750 struct acpi_create_field_info info;
751
752 ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
753
754 /* First arg is the name of the Index register (must already exist) */
755
756 arg = op->common.value.arg;
757 status =
758 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
759 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
760 ACPI_NS_SEARCH_PARENT, walk_state,
761 &info.register_node);
762 if (ACPI_FAILURE(status)) {
763 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
764 return_ACPI_STATUS(status);
765 }
766
767 /* Second arg is the data register (must already exist) */
768
769 arg = arg->common.next;
770 status =
771 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
772 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
773 ACPI_NS_SEARCH_PARENT, walk_state,
774 &info.data_register_node);
775 if (ACPI_FAILURE(status)) {
776 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
777 return_ACPI_STATUS(status);
778 }
779
780 /* Next arg is the field flags */
781
782 arg = arg->common.next;
783 info.field_flags = (u8) arg->common.value.integer;
784
785 /* Each remaining arg is a Named Field */
786
787 info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
788 info.region_node = region_node;
789
790 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
791 return_ACPI_STATUS(status);
792 }
Linus' kernel tree