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1/******************************************************************************
2 *
3 * Module Name: dsfield - Dispatcher field routines
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2012, 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
53ACPI_MODULE_NAME("dsfield")
54
55/* Local prototypes */
56static acpi_status
57acpi_ds_get_field_names(struct acpi_create_field_info *info,
58 struct acpi_walk_state *walk_state,
59 union acpi_parse_object *arg);
60
61/*******************************************************************************
62 *
63 * FUNCTION: acpi_ds_create_buffer_field
64 *
65 * PARAMETERS: Op - Current parse op (create_xXField)
66 * walk_state - Current state
67 *
68 * RETURN: Status
69 *
70 * DESCRIPTION: Execute the create_field operators:
71 * create_bit_field_op,
72 * create_byte_field_op,
73 * create_word_field_op,
74 * create_dword_field_op,
75 * create_qword_field_op,
76 * create_field_op (all of which define a field in a buffer)
77 *
78 ******************************************************************************/
79
80acpi_status
81acpi_ds_create_buffer_field(union acpi_parse_object *op,
82 struct acpi_walk_state *walk_state)
83{
84 union acpi_parse_object *arg;
85 struct acpi_namespace_node *node;
86 acpi_status status;
87 union acpi_operand_object *obj_desc;
88 union acpi_operand_object *second_desc = NULL;
89 u32 flags;
90
91 ACPI_FUNCTION_TRACE(ds_create_buffer_field);
92
93 /*
94 * Get the name_string argument (name of the new buffer_field)
95 */
96 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
97
98 /* For create_field, name is the 4th argument */
99
100 arg = acpi_ps_get_arg(op, 3);
101 } else {
102 /* For all other create_xXXField operators, name is the 3rd argument */
103
104 arg = acpi_ps_get_arg(op, 2);
105 }
106
107 if (!arg) {
108 return_ACPI_STATUS(AE_AML_NO_OPERAND);
109 }
110
111 if (walk_state->deferred_node) {
112 node = walk_state->deferred_node;
113 status = AE_OK;
114 } else {
115 /* Execute flag should always be set when this function is entered */
116
117 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
118 return_ACPI_STATUS(AE_AML_INTERNAL);
119 }
120
121 /* Creating new namespace node, should not already exist */
122
123 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
124 ACPI_NS_ERROR_IF_FOUND;
125
126 /*
127 * Mark node temporary if we are executing a normal control
128 * method. (Don't mark if this is a module-level code method)
129 */
130 if (walk_state->method_node &&
131 !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
132 flags |= ACPI_NS_TEMPORARY;
133 }
134
135 /* Enter the name_string into the namespace */
136
137 status =
138 acpi_ns_lookup(walk_state->scope_info,
139 arg->common.value.string, ACPI_TYPE_ANY,
140 ACPI_IMODE_LOAD_PASS1, flags, walk_state,
141 &node);
142 if (ACPI_FAILURE(status)) {
143 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
144 return_ACPI_STATUS(status);
145 }
146 }
147
148 /*
149 * We could put the returned object (Node) on the object stack for later,
150 * but for now, we will put it in the "op" object that the parser uses,
151 * so we can get it again at the end of this scope.
152 */
153 op->common.node = node;
154
155 /*
156 * If there is no object attached to the node, this node was just created
157 * and we need to create the field object. Otherwise, this was a lookup
158 * of an existing node and we don't want to create the field object again.
159 */
160 obj_desc = acpi_ns_get_attached_object(node);
161 if (obj_desc) {
162 return_ACPI_STATUS(AE_OK);
163 }
164
165 /*
166 * The Field definition is not fully parsed at this time.
167 * (We must save the address of the AML for the buffer and index operands)
168 */
169
170 /* Create the buffer field object */
171
172 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
173 if (!obj_desc) {
174 status = AE_NO_MEMORY;
175 goto cleanup;
176 }
177
178 /*
179 * Remember location in AML stream of the field unit opcode and operands --
180 * since the buffer and index operands must be evaluated.
181 */
182 second_desc = obj_desc->common.next_object;
183 second_desc->extra.aml_start = op->named.data;
184 second_desc->extra.aml_length = op->named.length;
185 obj_desc->buffer_field.node = node;
186
187 /* Attach constructed field descriptors to parent node */
188
189 status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
190 if (ACPI_FAILURE(status)) {
191 goto cleanup;
192 }
193
194 cleanup:
195
196 /* Remove local reference to the object */
197
198 acpi_ut_remove_reference(obj_desc);
199 return_ACPI_STATUS(status);
200}
201
202/*******************************************************************************
203 *
204 * FUNCTION: acpi_ds_get_field_names
205 *
206 * PARAMETERS: Info - create_field info structure
207 * ` walk_state - Current method state
208 * Arg - First parser arg for the field name list
209 *
210 * RETURN: Status
211 *
212 * DESCRIPTION: Process all named fields in a field declaration. Names are
213 * entered into the namespace.
214 *
215 ******************************************************************************/
216
217static acpi_status
218acpi_ds_get_field_names(struct acpi_create_field_info *info,
219 struct acpi_walk_state *walk_state,
220 union acpi_parse_object *arg)
221{
222 acpi_status status;
223 u64 position;
224 union acpi_parse_object *child;
225
226 ACPI_FUNCTION_TRACE_PTR(ds_get_field_names, info);
227
228 /* First field starts at bit zero */
229
230 info->field_bit_position = 0;
231
232 /* Process all elements in the field list (of parse nodes) */
233
234 while (arg) {
235 /*
236 * Four types of field elements are handled:
237 * 1) Name - Enters a new named field into the namespace
238 * 2) Offset - specifies a bit offset
239 * 3) access_as - changes the access mode/attributes
240 * 4) Connection - Associate a resource template with the field
241 */
242 switch (arg->common.aml_opcode) {
243 case AML_INT_RESERVEDFIELD_OP:
244
245 position = (u64) info->field_bit_position
246 + (u64) arg->common.value.size;
247
248 if (position > ACPI_UINT32_MAX) {
249 ACPI_ERROR((AE_INFO,
250 "Bit offset within field too large (> 0xFFFFFFFF)"));
251 return_ACPI_STATUS(AE_SUPPORT);
252 }
253
254 info->field_bit_position = (u32) position;
255 break;
256
257 case AML_INT_ACCESSFIELD_OP:
258 case AML_INT_EXTACCESSFIELD_OP:
259 /*
260 * Get new access_type, access_attribute, and access_length fields
261 * -- to be used for all field units that follow, until the
262 * end-of-field or another access_as keyword is encountered.
263 * NOTE. These three bytes are encoded in the integer value
264 * of the parseop for convenience.
265 *
266 * In field_flags, preserve the flag bits other than the
267 * ACCESS_TYPE bits.
268 */
269
270 /* access_type (byte_acc, word_acc, etc.) */
271
272 info->field_flags = (u8)
273 ((info->
274 field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
275 ((u8)((u32)(arg->common.value.integer & 0x07))));
276
277 /* access_attribute (attrib_quick, attrib_byte, etc.) */
278
279 info->attribute =
280 (u8)((arg->common.value.integer >> 8) & 0xFF);
281
282 /* access_length (for serial/buffer protocols) */
283
284 info->access_length =
285 (u8)((arg->common.value.integer >> 16) & 0xFF);
286 break;
287
288 case AML_INT_CONNECTION_OP:
289 /*
290 * Clear any previous connection. New connection is used for all
291 * fields that follow, similar to access_as
292 */
293 info->resource_buffer = NULL;
294 info->connection_node = NULL;
295
296 /*
297 * A Connection() is either an actual resource descriptor (buffer)
298 * or a named reference to a resource template
299 */
300 child = arg->common.value.arg;
301 if (child->common.aml_opcode == AML_INT_BYTELIST_OP) {
302 info->resource_buffer = child->named.data;
303 info->resource_length =
304 (u16)child->named.value.integer;
305 } else {
306 /* Lookup the Connection() namepath, it should already exist */
307
308 status = acpi_ns_lookup(walk_state->scope_info,
309 child->common.value.
310 name, ACPI_TYPE_ANY,
311 ACPI_IMODE_EXECUTE,
312 ACPI_NS_DONT_OPEN_SCOPE,
313 walk_state,
314 &info->connection_node);
315 if (ACPI_FAILURE(status)) {
316 ACPI_ERROR_NAMESPACE(child->common.
317 value.name,
318 status);
319 return_ACPI_STATUS(status);
320 }
321 }
322 break;
323
324 case AML_INT_NAMEDFIELD_OP:
325
326 /* Lookup the name, it should already exist */
327
328 status = acpi_ns_lookup(walk_state->scope_info,
329 (char *)&arg->named.name,
330 info->field_type,
331 ACPI_IMODE_EXECUTE,
332 ACPI_NS_DONT_OPEN_SCOPE,
333 walk_state, &info->field_node);
334 if (ACPI_FAILURE(status)) {
335 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
336 status);
337 return_ACPI_STATUS(status);
338 } else {
339 arg->common.node = info->field_node;
340 info->field_bit_length = arg->common.value.size;
341
342 /*
343 * If there is no object attached to the node, this node was
344 * just created and we need to create the field object.
345 * Otherwise, this was a lookup of an existing node and we
346 * don't want to create the field object again.
347 */
348 if (!acpi_ns_get_attached_object
349 (info->field_node)) {
350 status = acpi_ex_prep_field_value(info);
351 if (ACPI_FAILURE(status)) {
352 return_ACPI_STATUS(status);
353 }
354 }
355 }
356
357 /* Keep track of bit position for the next field */
358
359 position = (u64) info->field_bit_position
360 + (u64) arg->common.value.size;
361
362 if (position > ACPI_UINT32_MAX) {
363 ACPI_ERROR((AE_INFO,
364 "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
365 ACPI_CAST_PTR(char,
366 &info->field_node->
367 name)));
368 return_ACPI_STATUS(AE_SUPPORT);
369 }
370
371 info->field_bit_position += info->field_bit_length;
372 break;
373
374 default:
375
376 ACPI_ERROR((AE_INFO,
377 "Invalid opcode in field list: 0x%X",
378 arg->common.aml_opcode));
379 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
380 }
381
382 arg = arg->common.next;
383 }
384
385 return_ACPI_STATUS(AE_OK);
386}
387
388/*******************************************************************************
389 *
390 * FUNCTION: acpi_ds_create_field
391 *
392 * PARAMETERS: Op - Op containing the Field definition and args
393 * region_node - Object for the containing Operation Region
394 * ` walk_state - Current method state
395 *
396 * RETURN: Status
397 *
398 * DESCRIPTION: Create a new field in the specified operation region
399 *
400 ******************************************************************************/
401
402acpi_status
403acpi_ds_create_field(union acpi_parse_object *op,
404 struct acpi_namespace_node *region_node,
405 struct acpi_walk_state *walk_state)
406{
407 acpi_status status;
408 union acpi_parse_object *arg;
409 struct acpi_create_field_info info;
410
411 ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);
412
413 /* First arg is the name of the parent op_region (must already exist) */
414
415 arg = op->common.value.arg;
416 if (!region_node) {
417 status =
418 acpi_ns_lookup(walk_state->scope_info,
419 arg->common.value.name, ACPI_TYPE_REGION,
420 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
421 walk_state, ®ion_node);
422 if (ACPI_FAILURE(status)) {
423 ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
424 return_ACPI_STATUS(status);
425 }
426 }
427
428 ACPI_MEMSET(&info, 0, sizeof(struct acpi_create_field_info));
429
430 /* Second arg is the field flags */
431
432 arg = arg->common.next;
433 info.field_flags = (u8) arg->common.value.integer;
434 info.attribute = 0;
435
436 /* Each remaining arg is a Named Field */
437
438 info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
439 info.region_node = region_node;
440
441 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
442 return_ACPI_STATUS(status);
443}
444
445/*******************************************************************************
446 *
447 * FUNCTION: acpi_ds_init_field_objects
448 *
449 * PARAMETERS: Op - Op containing the Field definition and args
450 * ` walk_state - Current method state
451 *
452 * RETURN: Status
453 *
454 * DESCRIPTION: For each "Field Unit" name in the argument list that is
455 * part of the field declaration, enter the name into the
456 * namespace.
457 *
458 ******************************************************************************/
459
460acpi_status
461acpi_ds_init_field_objects(union acpi_parse_object *op,
462 struct acpi_walk_state *walk_state)
463{
464 acpi_status status;
465 union acpi_parse_object *arg = NULL;
466 struct acpi_namespace_node *node;
467 u8 type = 0;
468 u32 flags;
469
470 ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
471
472 /* Execute flag should always be set when this function is entered */
473
474 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
475 if (walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP) {
476
477 /* bank_field Op is deferred, just return OK */
478
479 return_ACPI_STATUS(AE_OK);
480 }
481
482 return_ACPI_STATUS(AE_AML_INTERNAL);
483 }
484
485 /*
486 * Get the field_list argument for this opcode. This is the start of the
487 * list of field elements.
488 */
489 switch (walk_state->opcode) {
490 case AML_FIELD_OP:
491 arg = acpi_ps_get_arg(op, 2);
492 type = ACPI_TYPE_LOCAL_REGION_FIELD;
493 break;
494
495 case AML_BANK_FIELD_OP:
496 arg = acpi_ps_get_arg(op, 4);
497 type = ACPI_TYPE_LOCAL_BANK_FIELD;
498 break;
499
500 case AML_INDEX_FIELD_OP:
501 arg = acpi_ps_get_arg(op, 3);
502 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
503 break;
504
505 default:
506 return_ACPI_STATUS(AE_BAD_PARAMETER);
507 }
508
509 /* Creating new namespace node(s), should not already exist */
510
511 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
512 ACPI_NS_ERROR_IF_FOUND;
513
514 /*
515 * Mark node(s) temporary if we are executing a normal control
516 * method. (Don't mark if this is a module-level code method)
517 */
518 if (walk_state->method_node &&
519 !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
520 flags |= ACPI_NS_TEMPORARY;
521 }
522
523 /*
524 * Walk the list of entries in the field_list
525 * Note: field_list can be of zero length. In this case, Arg will be NULL.
526 */
527 while (arg) {
528 /*
529 * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
530 * in the field names in order to enter them into the namespace.
531 */
532 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
533 status = acpi_ns_lookup(walk_state->scope_info,
534 (char *)&arg->named.name, type,
535 ACPI_IMODE_LOAD_PASS1, flags,
536 walk_state, &node);
537 if (ACPI_FAILURE(status)) {
538 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
539 status);
540 if (status != AE_ALREADY_EXISTS) {
541 return_ACPI_STATUS(status);
542 }
543
544 /* Name already exists, just ignore this error */
545
546 status = AE_OK;
547 }
548
549 arg->common.node = node;
550 }
551
552 /* Get the next field element in the list */
553
554 arg = arg->common.next;
555 }
556
557 return_ACPI_STATUS(AE_OK);
558}
559
560/*******************************************************************************
561 *
562 * FUNCTION: acpi_ds_create_bank_field
563 *
564 * PARAMETERS: Op - Op containing the Field definition and args
565 * region_node - Object for the containing Operation Region
566 * walk_state - Current method state
567 *
568 * RETURN: Status
569 *
570 * DESCRIPTION: Create a new bank field in the specified operation region
571 *
572 ******************************************************************************/
573
574acpi_status
575acpi_ds_create_bank_field(union acpi_parse_object *op,
576 struct acpi_namespace_node *region_node,
577 struct acpi_walk_state *walk_state)
578{
579 acpi_status status;
580 union acpi_parse_object *arg;
581 struct acpi_create_field_info info;
582
583 ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
584
585 /* First arg is the name of the parent op_region (must already exist) */
586
587 arg = op->common.value.arg;
588 if (!region_node) {
589 status =
590 acpi_ns_lookup(walk_state->scope_info,
591 arg->common.value.name, ACPI_TYPE_REGION,
592 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
593 walk_state, ®ion_node);
594 if (ACPI_FAILURE(status)) {
595 ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
596 return_ACPI_STATUS(status);
597 }
598 }
599
600 /* Second arg is the Bank Register (Field) (must already exist) */
601
602 arg = arg->common.next;
603 status =
604 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
605 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
606 ACPI_NS_SEARCH_PARENT, walk_state,
607 &info.register_node);
608 if (ACPI_FAILURE(status)) {
609 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
610 return_ACPI_STATUS(status);
611 }
612
613 /*
614 * Third arg is the bank_value
615 * This arg is a term_arg, not a constant
616 * It will be evaluated later, by acpi_ds_eval_bank_field_operands
617 */
618 arg = arg->common.next;
619
620 /* Fourth arg is the field flags */
621
622 arg = arg->common.next;
623 info.field_flags = (u8) arg->common.value.integer;
624
625 /* Each remaining arg is a Named Field */
626
627 info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
628 info.region_node = region_node;
629
630 /*
631 * Use Info.data_register_node to store bank_field Op
632 * It's safe because data_register_node will never be used when create bank field
633 * We store aml_start and aml_length in the bank_field Op for late evaluation
634 * Used in acpi_ex_prep_field_value(Info)
635 *
636 * TBD: Or, should we add a field in struct acpi_create_field_info, like "void *ParentOp"?
637 */
638 info.data_register_node = (struct acpi_namespace_node *)op;
639
640 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
641 return_ACPI_STATUS(status);
642}
643
644/*******************************************************************************
645 *
646 * FUNCTION: acpi_ds_create_index_field
647 *
648 * PARAMETERS: Op - Op containing the Field definition and args
649 * region_node - Object for the containing Operation Region
650 * ` walk_state - Current method state
651 *
652 * RETURN: Status
653 *
654 * DESCRIPTION: Create a new index field in the specified operation region
655 *
656 ******************************************************************************/
657
658acpi_status
659acpi_ds_create_index_field(union acpi_parse_object *op,
660 struct acpi_namespace_node *region_node,
661 struct acpi_walk_state *walk_state)
662{
663 acpi_status status;
664 union acpi_parse_object *arg;
665 struct acpi_create_field_info info;
666
667 ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
668
669 /* First arg is the name of the Index register (must already exist) */
670
671 arg = op->common.value.arg;
672 status =
673 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
674 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
675 ACPI_NS_SEARCH_PARENT, walk_state,
676 &info.register_node);
677 if (ACPI_FAILURE(status)) {
678 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
679 return_ACPI_STATUS(status);
680 }
681
682 /* Second arg is the data register (must already exist) */
683
684 arg = arg->common.next;
685 status =
686 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
687 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
688 ACPI_NS_SEARCH_PARENT, walk_state,
689 &info.data_register_node);
690 if (ACPI_FAILURE(status)) {
691 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
692 return_ACPI_STATUS(status);
693 }
694
695 /* Next arg is the field flags */
696
697 arg = arg->common.next;
698 info.field_flags = (u8) arg->common.value.integer;
699
700 /* Each remaining arg is a Named Field */
701
702 info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
703 info.region_node = region_node;
704
705 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
706 return_ACPI_STATUS(status);
707}
1/******************************************************************************
2 *
3 * Module Name: dsfield - Dispatcher field routines
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, 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
53ACPI_MODULE_NAME("dsfield")
54
55/* Local prototypes */
56#ifdef ACPI_ASL_COMPILER
57#include "acdisasm.h"
58static acpi_status
59acpi_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
66static acpi_status
67acpi_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
89static acpi_status
90acpi_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
110 status = acpi_ns_lookup(walk_state->scope_info, path, ACPI_TYPE_REGION,
111 ACPI_IMODE_LOAD_PASS1, ACPI_NS_SEARCH_PARENT,
112 walk_state, node);
113 if (ACPI_FAILURE(status)) {
114 return (status);
115 }
116
117 /* Must create and install a region object for the new node */
118
119 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
120 if (!obj_desc) {
121 return (AE_NO_MEMORY);
122 }
123
124 obj_desc->region.node = *node;
125 status = acpi_ns_attach_object(*node, obj_desc, ACPI_TYPE_REGION);
126 return (status);
127}
128#endif
129
130/*******************************************************************************
131 *
132 * FUNCTION: acpi_ds_create_buffer_field
133 *
134 * PARAMETERS: op - Current parse op (create_XXField)
135 * walk_state - Current state
136 *
137 * RETURN: Status
138 *
139 * DESCRIPTION: Execute the create_field operators:
140 * create_bit_field_op,
141 * create_byte_field_op,
142 * create_word_field_op,
143 * create_dword_field_op,
144 * create_qword_field_op,
145 * create_field_op (all of which define a field in a buffer)
146 *
147 ******************************************************************************/
148
149acpi_status
150acpi_ds_create_buffer_field(union acpi_parse_object *op,
151 struct acpi_walk_state *walk_state)
152{
153 union acpi_parse_object *arg;
154 struct acpi_namespace_node *node;
155 acpi_status status;
156 union acpi_operand_object *obj_desc;
157 union acpi_operand_object *second_desc = NULL;
158 u32 flags;
159
160 ACPI_FUNCTION_TRACE(ds_create_buffer_field);
161
162 /*
163 * Get the name_string argument (name of the new buffer_field)
164 */
165 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
166
167 /* For create_field, name is the 4th argument */
168
169 arg = acpi_ps_get_arg(op, 3);
170 } else {
171 /* For all other create_XXXField operators, name is the 3rd argument */
172
173 arg = acpi_ps_get_arg(op, 2);
174 }
175
176 if (!arg) {
177 return_ACPI_STATUS(AE_AML_NO_OPERAND);
178 }
179
180 if (walk_state->deferred_node) {
181 node = walk_state->deferred_node;
182 status = AE_OK;
183 } else {
184 /* Execute flag should always be set when this function is entered */
185
186 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
187 return_ACPI_STATUS(AE_AML_INTERNAL);
188 }
189
190 /* Creating new namespace node, should not already exist */
191
192 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
193 ACPI_NS_ERROR_IF_FOUND;
194
195 /*
196 * Mark node temporary if we are executing a normal control
197 * method. (Don't mark if this is a module-level code method)
198 */
199 if (walk_state->method_node &&
200 !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
201 flags |= ACPI_NS_TEMPORARY;
202 }
203
204 /* Enter the name_string into the namespace */
205
206 status = acpi_ns_lookup(walk_state->scope_info,
207 arg->common.value.string, ACPI_TYPE_ANY,
208 ACPI_IMODE_LOAD_PASS1, flags,
209 walk_state, &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
262cleanup:
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
285static acpi_status
286acpi_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 = (u8)
348 ((arg->common.value.integer >> 8) & 0xFF);
349
350 /* access_length (for serial/buffer protocols) */
351
352 info->access_length = (u8)
353 ((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
472acpi_status
473acpi_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, ®ion_node);
493#ifdef ACPI_ASL_COMPILER
494 status = acpi_ds_create_external_region(status, arg,
495 arg->common.value.name,
496 walk_state,
497 ®ion_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 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
537acpi_status
538acpi_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
655acpi_status
656acpi_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, ®ion_node);
675#ifdef ACPI_ASL_COMPILER
676 status = acpi_ds_create_external_region(status, arg,
677 arg->common.value.name,
678 walk_state,
679 ®ion_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
720 * bank field \we store aml_start and aml_length in the bank_field Op for
721 * late evaluation. Used in acpi_ex_prep_field_value(Info)
722 *
723 * TBD: Or, should we add a field in struct acpi_create_field_info, like
724 * "void *ParentOp"?
725 */
726 info.data_register_node = (struct acpi_namespace_node *)op;
727
728 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
729 return_ACPI_STATUS(status);
730}
731
732/*******************************************************************************
733 *
734 * FUNCTION: acpi_ds_create_index_field
735 *
736 * PARAMETERS: op - Op containing the Field definition and args
737 * region_node - Object for the containing Operation Region
738 * ` walk_state - Current method state
739 *
740 * RETURN: Status
741 *
742 * DESCRIPTION: Create a new index field in the specified operation region
743 *
744 ******************************************************************************/
745
746acpi_status
747acpi_ds_create_index_field(union acpi_parse_object *op,
748 struct acpi_namespace_node *region_node,
749 struct acpi_walk_state *walk_state)
750{
751 acpi_status status;
752 union acpi_parse_object *arg;
753 struct acpi_create_field_info info;
754
755 ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
756
757 /* First arg is the name of the Index register (must already exist) */
758
759 arg = op->common.value.arg;
760 status =
761 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
762 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
763 ACPI_NS_SEARCH_PARENT, walk_state,
764 &info.register_node);
765 if (ACPI_FAILURE(status)) {
766 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
767 return_ACPI_STATUS(status);
768 }
769
770 /* Second arg is the data register (must already exist) */
771
772 arg = arg->common.next;
773 status =
774 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
775 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
776 ACPI_NS_SEARCH_PARENT, walk_state,
777 &info.data_register_node);
778 if (ACPI_FAILURE(status)) {
779 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
780 return_ACPI_STATUS(status);
781 }
782
783 /* Next arg is the field flags */
784
785 arg = arg->common.next;
786 info.field_flags = (u8) arg->common.value.integer;
787
788 /* Each remaining arg is a Named Field */
789
790 info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
791 info.region_node = region_node;
792
793 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
794 return_ACPI_STATUS(status);
795}