ACPICA: Update to GPIO region handler interface.
[linux-3.10.git] / drivers / acpi / acpica / dsfield.c
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                         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                 arg = acpi_ps_get_arg(op, 2);
569                 type = ACPI_TYPE_LOCAL_REGION_FIELD;
570                 break;
571
572         case AML_BANK_FIELD_OP:
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                 arg = acpi_ps_get_arg(op, 3);
579                 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
580                 break;
581
582         default:
583                 return_ACPI_STATUS(AE_BAD_PARAMETER);
584         }
585
586         /* Creating new namespace node(s), should not already exist */
587
588         flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
589             ACPI_NS_ERROR_IF_FOUND;
590
591         /*
592          * Mark node(s) temporary if we are executing a normal control
593          * method. (Don't mark if this is a module-level code method)
594          */
595         if (walk_state->method_node &&
596             !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
597                 flags |= ACPI_NS_TEMPORARY;
598         }
599
600         /*
601          * Walk the list of entries in the field_list
602          * Note: field_list can be of zero length. In this case, Arg will be NULL.
603          */
604         while (arg) {
605                 /*
606                  * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
607                  * in the field names in order to enter them into the namespace.
608                  */
609                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
610                         status = acpi_ns_lookup(walk_state->scope_info,
611                                                 (char *)&arg->named.name, type,
612                                                 ACPI_IMODE_LOAD_PASS1, flags,
613                                                 walk_state, &node);
614                         if (ACPI_FAILURE(status)) {
615                                 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
616                                                      status);
617                                 if (status != AE_ALREADY_EXISTS) {
618                                         return_ACPI_STATUS(status);
619                                 }
620
621                                 /* Name already exists, just ignore this error */
622
623                                 status = AE_OK;
624                         }
625
626                         arg->common.node = node;
627                 }
628
629                 /* Get the next field element in the list */
630
631                 arg = arg->common.next;
632         }
633
634         return_ACPI_STATUS(AE_OK);
635 }
636
637 /*******************************************************************************
638  *
639  * FUNCTION:    acpi_ds_create_bank_field
640  *
641  * PARAMETERS:  op              - Op containing the Field definition and args
642  *              region_node     - Object for the containing Operation Region
643  *              walk_state      - Current method state
644  *
645  * RETURN:      Status
646  *
647  * DESCRIPTION: Create a new bank field in the specified operation region
648  *
649  ******************************************************************************/
650
651 acpi_status
652 acpi_ds_create_bank_field(union acpi_parse_object *op,
653                           struct acpi_namespace_node *region_node,
654                           struct acpi_walk_state *walk_state)
655 {
656         acpi_status status;
657         union acpi_parse_object *arg;
658         struct acpi_create_field_info info;
659
660         ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
661
662         /* First arg is the name of the parent op_region (must already exist) */
663
664         arg = op->common.value.arg;
665         if (!region_node) {
666                 status =
667                     acpi_ns_lookup(walk_state->scope_info,
668                                    arg->common.value.name, ACPI_TYPE_REGION,
669                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
670                                    walk_state, &region_node);
671 #ifdef ACPI_ASL_COMPILER
672                 status = acpi_ds_create_external_region(status, arg,
673                                                         arg->common.value.name,
674                                                         walk_state,
675                                                         &region_node);
676 #endif
677                 if (ACPI_FAILURE(status)) {
678                         ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
679                         return_ACPI_STATUS(status);
680                 }
681         }
682
683         /* Second arg is the Bank Register (Field) (must already exist) */
684
685         arg = arg->common.next;
686         status =
687             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
688                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
689                            ACPI_NS_SEARCH_PARENT, walk_state,
690                            &info.register_node);
691         if (ACPI_FAILURE(status)) {
692                 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
693                 return_ACPI_STATUS(status);
694         }
695
696         /*
697          * Third arg is the bank_value
698          * This arg is a term_arg, not a constant
699          * It will be evaluated later, by acpi_ds_eval_bank_field_operands
700          */
701         arg = arg->common.next;
702
703         /* Fourth arg is the field flags */
704
705         arg = arg->common.next;
706         info.field_flags = (u8) arg->common.value.integer;
707
708         /* Each remaining arg is a Named Field */
709
710         info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
711         info.region_node = region_node;
712
713         /*
714          * Use Info.data_register_node to store bank_field Op
715          * It's safe because data_register_node will never be used when create bank field
716          * We store aml_start and aml_length in the bank_field Op for late evaluation
717          * Used in acpi_ex_prep_field_value(Info)
718          *
719          * TBD: Or, should we add a field in struct acpi_create_field_info, like "void *ParentOp"?
720          */
721         info.data_register_node = (struct acpi_namespace_node *)op;
722
723         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
724         return_ACPI_STATUS(status);
725 }
726
727 /*******************************************************************************
728  *
729  * FUNCTION:    acpi_ds_create_index_field
730  *
731  * PARAMETERS:  op              - Op containing the Field definition and args
732  *              region_node     - Object for the containing Operation Region
733  *  `           walk_state      - Current method state
734  *
735  * RETURN:      Status
736  *
737  * DESCRIPTION: Create a new index field in the specified operation region
738  *
739  ******************************************************************************/
740
741 acpi_status
742 acpi_ds_create_index_field(union acpi_parse_object *op,
743                            struct acpi_namespace_node *region_node,
744                            struct acpi_walk_state *walk_state)
745 {
746         acpi_status status;
747         union acpi_parse_object *arg;
748         struct acpi_create_field_info info;
749
750         ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
751
752         /* First arg is the name of the Index register (must already exist) */
753
754         arg = op->common.value.arg;
755         status =
756             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
757                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
758                            ACPI_NS_SEARCH_PARENT, walk_state,
759                            &info.register_node);
760         if (ACPI_FAILURE(status)) {
761                 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
762                 return_ACPI_STATUS(status);
763         }
764
765         /* Second arg is the data register (must already exist) */
766
767         arg = arg->common.next;
768         status =
769             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
770                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
771                            ACPI_NS_SEARCH_PARENT, walk_state,
772                            &info.data_register_node);
773         if (ACPI_FAILURE(status)) {
774                 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
775                 return_ACPI_STATUS(status);
776         }
777
778         /* Next arg is the field flags */
779
780         arg = arg->common.next;
781         info.field_flags = (u8) arg->common.value.integer;
782
783         /* Each remaining arg is a Named Field */
784
785         info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
786         info.region_node = region_node;
787
788         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
789         return_ACPI_STATUS(status);
790 }