Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6] / drivers / acpi / dispatcher / dsopcode.c
1 /******************************************************************************
2  *
3  * Module Name: dsopcode - Dispatcher Op Region support and handling of
4  *                         "control" opcodes
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2008, Intel Corp.
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44
45 #include <acpi/acpi.h>
46 #include <acpi/acparser.h>
47 #include <acpi/amlcode.h>
48 #include <acpi/acdispat.h>
49 #include <acpi/acinterp.h>
50 #include <acpi/acnamesp.h>
51 #include <acpi/acevents.h>
52 #include <acpi/actables.h>
53
54 #define _COMPONENT          ACPI_DISPATCHER
55 ACPI_MODULE_NAME("dsopcode")
56
57 /* Local prototypes */
58 static acpi_status
59 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
60                           struct acpi_namespace_node *scope_node,
61                           u32 aml_length, u8 * aml_start);
62
63 static acpi_status
64 acpi_ds_init_buffer_field(u16 aml_opcode,
65                           union acpi_operand_object *obj_desc,
66                           union acpi_operand_object *buffer_desc,
67                           union acpi_operand_object *offset_desc,
68                           union acpi_operand_object *length_desc,
69                           union acpi_operand_object *result_desc);
70
71 /*******************************************************************************
72  *
73  * FUNCTION:    acpi_ds_execute_arguments
74  *
75  * PARAMETERS:  Node                - Object NS node
76  *              scope_node          - Parent NS node
77  *              aml_length          - Length of executable AML
78  *              aml_start           - Pointer to the AML
79  *
80  * RETURN:      Status.
81  *
82  * DESCRIPTION: Late (deferred) execution of region or field arguments
83  *
84  ******************************************************************************/
85
86 static acpi_status
87 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
88                           struct acpi_namespace_node *scope_node,
89                           u32 aml_length, u8 * aml_start)
90 {
91         acpi_status status;
92         union acpi_parse_object *op;
93         struct acpi_walk_state *walk_state;
94
95         ACPI_FUNCTION_TRACE(ds_execute_arguments);
96
97         /*
98          * Allocate a new parser op to be the root of the parsed tree
99          */
100         op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
101         if (!op) {
102                 return_ACPI_STATUS(AE_NO_MEMORY);
103         }
104
105         /* Save the Node for use in acpi_ps_parse_aml */
106
107         op->common.node = scope_node;
108
109         /* Create and initialize a new parser state */
110
111         walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
112         if (!walk_state) {
113                 status = AE_NO_MEMORY;
114                 goto cleanup;
115         }
116
117         status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
118                                        aml_length, NULL, ACPI_IMODE_LOAD_PASS1);
119         if (ACPI_FAILURE(status)) {
120                 acpi_ds_delete_walk_state(walk_state);
121                 goto cleanup;
122         }
123
124         /* Mark this parse as a deferred opcode */
125
126         walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP;
127         walk_state->deferred_node = node;
128
129         /* Pass1: Parse the entire declaration */
130
131         status = acpi_ps_parse_aml(walk_state);
132         if (ACPI_FAILURE(status)) {
133                 goto cleanup;
134         }
135
136         /* Get and init the Op created above */
137
138         op->common.node = node;
139         acpi_ps_delete_parse_tree(op);
140
141         /* Evaluate the deferred arguments */
142
143         op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
144         if (!op) {
145                 return_ACPI_STATUS(AE_NO_MEMORY);
146         }
147
148         op->common.node = scope_node;
149
150         /* Create and initialize a new parser state */
151
152         walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
153         if (!walk_state) {
154                 status = AE_NO_MEMORY;
155                 goto cleanup;
156         }
157
158         /* Execute the opcode and arguments */
159
160         status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
161                                        aml_length, NULL, ACPI_IMODE_EXECUTE);
162         if (ACPI_FAILURE(status)) {
163                 acpi_ds_delete_walk_state(walk_state);
164                 goto cleanup;
165         }
166
167         /* Mark this execution as a deferred opcode */
168
169         walk_state->deferred_node = node;
170         status = acpi_ps_parse_aml(walk_state);
171
172       cleanup:
173         acpi_ps_delete_parse_tree(op);
174         return_ACPI_STATUS(status);
175 }
176
177 /*******************************************************************************
178  *
179  * FUNCTION:    acpi_ds_get_buffer_field_arguments
180  *
181  * PARAMETERS:  obj_desc        - A valid buffer_field object
182  *
183  * RETURN:      Status.
184  *
185  * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late
186  *              evaluation of these field attributes.
187  *
188  ******************************************************************************/
189
190 acpi_status
191 acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
192 {
193         union acpi_operand_object *extra_desc;
194         struct acpi_namespace_node *node;
195         acpi_status status;
196
197         ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_field_arguments, obj_desc);
198
199         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
200                 return_ACPI_STATUS(AE_OK);
201         }
202
203         /* Get the AML pointer (method object) and buffer_field node */
204
205         extra_desc = acpi_ns_get_secondary_object(obj_desc);
206         node = obj_desc->buffer_field.node;
207
208         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
209                         (ACPI_TYPE_BUFFER_FIELD, node, NULL));
210         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BufferField Arg Init\n",
211                           acpi_ut_get_node_name(node)));
212
213         /* Execute the AML code for the term_arg arguments */
214
215         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
216                                            extra_desc->extra.aml_length,
217                                            extra_desc->extra.aml_start);
218         return_ACPI_STATUS(status);
219 }
220
221 /*******************************************************************************
222  *
223  * FUNCTION:    acpi_ds_get_bank_field_arguments
224  *
225  * PARAMETERS:  obj_desc        - A valid bank_field object
226  *
227  * RETURN:      Status.
228  *
229  * DESCRIPTION: Get bank_field bank_value. This implements the late
230  *              evaluation of these field attributes.
231  *
232  ******************************************************************************/
233
234 acpi_status
235 acpi_ds_get_bank_field_arguments(union acpi_operand_object *obj_desc)
236 {
237         union acpi_operand_object *extra_desc;
238         struct acpi_namespace_node *node;
239         acpi_status status;
240
241         ACPI_FUNCTION_TRACE_PTR(ds_get_bank_field_arguments, obj_desc);
242
243         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
244                 return_ACPI_STATUS(AE_OK);
245         }
246
247         /* Get the AML pointer (method object) and bank_field node */
248
249         extra_desc = acpi_ns_get_secondary_object(obj_desc);
250         node = obj_desc->bank_field.node;
251
252         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
253                         (ACPI_TYPE_LOCAL_BANK_FIELD, node, NULL));
254         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BankField Arg Init\n",
255                           acpi_ut_get_node_name(node)));
256
257         /* Execute the AML code for the term_arg arguments */
258
259         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
260                                            extra_desc->extra.aml_length,
261                                            extra_desc->extra.aml_start);
262         return_ACPI_STATUS(status);
263 }
264
265 /*******************************************************************************
266  *
267  * FUNCTION:    acpi_ds_get_buffer_arguments
268  *
269  * PARAMETERS:  obj_desc        - A valid Buffer object
270  *
271  * RETURN:      Status.
272  *
273  * DESCRIPTION: Get Buffer length and initializer byte list.  This implements
274  *              the late evaluation of these attributes.
275  *
276  ******************************************************************************/
277
278 acpi_status acpi_ds_get_buffer_arguments(union acpi_operand_object *obj_desc)
279 {
280         struct acpi_namespace_node *node;
281         acpi_status status;
282
283         ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_arguments, obj_desc);
284
285         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
286                 return_ACPI_STATUS(AE_OK);
287         }
288
289         /* Get the Buffer node */
290
291         node = obj_desc->buffer.node;
292         if (!node) {
293                 ACPI_ERROR((AE_INFO,
294                             "No pointer back to NS node in buffer obj %p",
295                             obj_desc));
296                 return_ACPI_STATUS(AE_AML_INTERNAL);
297         }
298
299         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n"));
300
301         /* Execute the AML code for the term_arg arguments */
302
303         status = acpi_ds_execute_arguments(node, node,
304                                            obj_desc->buffer.aml_length,
305                                            obj_desc->buffer.aml_start);
306         return_ACPI_STATUS(status);
307 }
308
309 /*******************************************************************************
310  *
311  * FUNCTION:    acpi_ds_get_package_arguments
312  *
313  * PARAMETERS:  obj_desc        - A valid Package object
314  *
315  * RETURN:      Status.
316  *
317  * DESCRIPTION: Get Package length and initializer byte list.  This implements
318  *              the late evaluation of these attributes.
319  *
320  ******************************************************************************/
321
322 acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc)
323 {
324         struct acpi_namespace_node *node;
325         acpi_status status;
326
327         ACPI_FUNCTION_TRACE_PTR(ds_get_package_arguments, obj_desc);
328
329         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
330                 return_ACPI_STATUS(AE_OK);
331         }
332
333         /* Get the Package node */
334
335         node = obj_desc->package.node;
336         if (!node) {
337                 ACPI_ERROR((AE_INFO,
338                             "No pointer back to NS node in package %p",
339                             obj_desc));
340                 return_ACPI_STATUS(AE_AML_INTERNAL);
341         }
342
343         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n"));
344
345         /* Execute the AML code for the term_arg arguments */
346
347         status = acpi_ds_execute_arguments(node, node,
348                                            obj_desc->package.aml_length,
349                                            obj_desc->package.aml_start);
350         return_ACPI_STATUS(status);
351 }
352
353 /*****************************************************************************
354  *
355  * FUNCTION:    acpi_ds_get_region_arguments
356  *
357  * PARAMETERS:  obj_desc        - A valid region object
358  *
359  * RETURN:      Status.
360  *
361  * DESCRIPTION: Get region address and length.  This implements the late
362  *              evaluation of these region attributes.
363  *
364  ****************************************************************************/
365
366 acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
367 {
368         struct acpi_namespace_node *node;
369         acpi_status status;
370         union acpi_operand_object *extra_desc;
371
372         ACPI_FUNCTION_TRACE_PTR(ds_get_region_arguments, obj_desc);
373
374         if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
375                 return_ACPI_STATUS(AE_OK);
376         }
377
378         extra_desc = acpi_ns_get_secondary_object(obj_desc);
379         if (!extra_desc) {
380                 return_ACPI_STATUS(AE_NOT_EXIST);
381         }
382
383         /* Get the Region node */
384
385         node = obj_desc->region.node;
386
387         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
388                         (ACPI_TYPE_REGION, node, NULL));
389
390         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] OpRegion Arg Init at AML %p\n",
391                           acpi_ut_get_node_name(node),
392                           extra_desc->extra.aml_start));
393
394         /* Execute the argument AML */
395
396         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
397                                            extra_desc->extra.aml_length,
398                                            extra_desc->extra.aml_start);
399         if (ACPI_FAILURE(status)) {
400                 return_ACPI_STATUS(status);
401         }
402
403         /* Validate the region address/length via the host OS */
404
405         status = acpi_os_validate_address(obj_desc->region.space_id,
406                                           obj_desc->region.address,
407                                           (acpi_size) obj_desc->region.length,
408                                           acpi_ut_get_node_name(node));
409
410         if (ACPI_FAILURE(status)) {
411                 /*
412                  * Invalid address/length. We will emit an error message and mark
413                  * the region as invalid, so that it will cause an additional error if
414                  * it is ever used. Then return AE_OK.
415                  */
416                 ACPI_EXCEPTION((AE_INFO, status,
417                                 "During address validation of OpRegion [%4.4s]",
418                                 node->name.ascii));
419                 obj_desc->common.flags |= AOPOBJ_INVALID;
420                 status = AE_OK;
421         }
422
423         return_ACPI_STATUS(status);
424 }
425
426 /*******************************************************************************
427  *
428  * FUNCTION:    acpi_ds_initialize_region
429  *
430  * PARAMETERS:  obj_handle      - Region namespace node
431  *
432  * RETURN:      Status
433  *
434  * DESCRIPTION: Front end to ev_initialize_region
435  *
436  ******************************************************************************/
437
438 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
439 {
440         union acpi_operand_object *obj_desc;
441         acpi_status status;
442
443         obj_desc = acpi_ns_get_attached_object(obj_handle);
444
445         /* Namespace is NOT locked */
446
447         status = acpi_ev_initialize_region(obj_desc, FALSE);
448         return (status);
449 }
450
451 /*******************************************************************************
452  *
453  * FUNCTION:    acpi_ds_init_buffer_field
454  *
455  * PARAMETERS:  aml_opcode      - create_xxx_field
456  *              obj_desc        - buffer_field object
457  *              buffer_desc     - Host Buffer
458  *              offset_desc     - Offset into buffer
459  *              length_desc     - Length of field (CREATE_FIELD_OP only)
460  *              result_desc     - Where to store the result
461  *
462  * RETURN:      Status
463  *
464  * DESCRIPTION: Perform actual initialization of a buffer field
465  *
466  ******************************************************************************/
467
468 static acpi_status
469 acpi_ds_init_buffer_field(u16 aml_opcode,
470                           union acpi_operand_object *obj_desc,
471                           union acpi_operand_object *buffer_desc,
472                           union acpi_operand_object *offset_desc,
473                           union acpi_operand_object *length_desc,
474                           union acpi_operand_object *result_desc)
475 {
476         u32 offset;
477         u32 bit_offset;
478         u32 bit_count;
479         u8 field_flags;
480         acpi_status status;
481
482         ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
483
484         /* Host object must be a Buffer */
485
486         if (ACPI_GET_OBJECT_TYPE(buffer_desc) != ACPI_TYPE_BUFFER) {
487                 ACPI_ERROR((AE_INFO,
488                             "Target of Create Field is not a Buffer object - %s",
489                             acpi_ut_get_object_type_name(buffer_desc)));
490
491                 status = AE_AML_OPERAND_TYPE;
492                 goto cleanup;
493         }
494
495         /*
496          * The last parameter to all of these opcodes (result_desc) started
497          * out as a name_string, and should therefore now be a NS node
498          * after resolution in acpi_ex_resolve_operands().
499          */
500         if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
501                 ACPI_ERROR((AE_INFO,
502                             "(%s) destination not a NS Node [%s]",
503                             acpi_ps_get_opcode_name(aml_opcode),
504                             acpi_ut_get_descriptor_name(result_desc)));
505
506                 status = AE_AML_OPERAND_TYPE;
507                 goto cleanup;
508         }
509
510         offset = (u32) offset_desc->integer.value;
511
512         /*
513          * Setup the Bit offsets and counts, according to the opcode
514          */
515         switch (aml_opcode) {
516         case AML_CREATE_FIELD_OP:
517
518                 /* Offset is in bits, count is in bits */
519
520                 field_flags = AML_FIELD_ACCESS_BYTE;
521                 bit_offset = offset;
522                 bit_count = (u32) length_desc->integer.value;
523
524                 /* Must have a valid (>0) bit count */
525
526                 if (bit_count == 0) {
527                         ACPI_ERROR((AE_INFO,
528                                     "Attempt to CreateField of length zero"));
529                         status = AE_AML_OPERAND_VALUE;
530                         goto cleanup;
531                 }
532                 break;
533
534         case AML_CREATE_BIT_FIELD_OP:
535
536                 /* Offset is in bits, Field is one bit */
537
538                 bit_offset = offset;
539                 bit_count = 1;
540                 field_flags = AML_FIELD_ACCESS_BYTE;
541                 break;
542
543         case AML_CREATE_BYTE_FIELD_OP:
544
545                 /* Offset is in bytes, field is one byte */
546
547                 bit_offset = 8 * offset;
548                 bit_count = 8;
549                 field_flags = AML_FIELD_ACCESS_BYTE;
550                 break;
551
552         case AML_CREATE_WORD_FIELD_OP:
553
554                 /* Offset is in bytes, field is one word */
555
556                 bit_offset = 8 * offset;
557                 bit_count = 16;
558                 field_flags = AML_FIELD_ACCESS_WORD;
559                 break;
560
561         case AML_CREATE_DWORD_FIELD_OP:
562
563                 /* Offset is in bytes, field is one dword */
564
565                 bit_offset = 8 * offset;
566                 bit_count = 32;
567                 field_flags = AML_FIELD_ACCESS_DWORD;
568                 break;
569
570         case AML_CREATE_QWORD_FIELD_OP:
571
572                 /* Offset is in bytes, field is one qword */
573
574                 bit_offset = 8 * offset;
575                 bit_count = 64;
576                 field_flags = AML_FIELD_ACCESS_QWORD;
577                 break;
578
579         default:
580
581                 ACPI_ERROR((AE_INFO,
582                             "Unknown field creation opcode %02x", aml_opcode));
583                 status = AE_AML_BAD_OPCODE;
584                 goto cleanup;
585         }
586
587         /* Entire field must fit within the current length of the buffer */
588
589         if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
590                 ACPI_ERROR((AE_INFO,
591                             "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)",
592                             acpi_ut_get_node_name(result_desc),
593                             bit_offset + bit_count,
594                             acpi_ut_get_node_name(buffer_desc->buffer.node),
595                             8 * (u32) buffer_desc->buffer.length));
596                 status = AE_AML_BUFFER_LIMIT;
597                 goto cleanup;
598         }
599
600         /*
601          * Initialize areas of the field object that are common to all fields
602          * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
603          * UPDATE_RULE = 0 (UPDATE_PRESERVE)
604          */
605         status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
606                                                   bit_offset, bit_count);
607         if (ACPI_FAILURE(status)) {
608                 goto cleanup;
609         }
610
611         obj_desc->buffer_field.buffer_obj = buffer_desc;
612
613         /* Reference count for buffer_desc inherits obj_desc count */
614
615         buffer_desc->common.reference_count = (u16)
616             (buffer_desc->common.reference_count +
617              obj_desc->common.reference_count);
618
619       cleanup:
620
621         /* Always delete the operands */
622
623         acpi_ut_remove_reference(offset_desc);
624         acpi_ut_remove_reference(buffer_desc);
625
626         if (aml_opcode == AML_CREATE_FIELD_OP) {
627                 acpi_ut_remove_reference(length_desc);
628         }
629
630         /* On failure, delete the result descriptor */
631
632         if (ACPI_FAILURE(status)) {
633                 acpi_ut_remove_reference(result_desc);  /* Result descriptor */
634         } else {
635                 /* Now the address and length are valid for this buffer_field */
636
637                 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
638         }
639
640         return_ACPI_STATUS(status);
641 }
642
643 /*******************************************************************************
644  *
645  * FUNCTION:    acpi_ds_eval_buffer_field_operands
646  *
647  * PARAMETERS:  walk_state      - Current walk
648  *              Op              - A valid buffer_field Op object
649  *
650  * RETURN:      Status
651  *
652  * DESCRIPTION: Get buffer_field Buffer and Index
653  *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
654  *
655  ******************************************************************************/
656
657 acpi_status
658 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
659                                    union acpi_parse_object *op)
660 {
661         acpi_status status;
662         union acpi_operand_object *obj_desc;
663         struct acpi_namespace_node *node;
664         union acpi_parse_object *next_op;
665
666         ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
667
668         /*
669          * This is where we evaluate the address and length fields of the
670          * create_xxx_field declaration
671          */
672         node = op->common.node;
673
674         /* next_op points to the op that holds the Buffer */
675
676         next_op = op->common.value.arg;
677
678         /* Evaluate/create the address and length operands */
679
680         status = acpi_ds_create_operands(walk_state, next_op);
681         if (ACPI_FAILURE(status)) {
682                 return_ACPI_STATUS(status);
683         }
684
685         obj_desc = acpi_ns_get_attached_object(node);
686         if (!obj_desc) {
687                 return_ACPI_STATUS(AE_NOT_EXIST);
688         }
689
690         /* Resolve the operands */
691
692         status = acpi_ex_resolve_operands(op->common.aml_opcode,
693                                           ACPI_WALK_OPERANDS, walk_state);
694
695         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
696                            acpi_ps_get_opcode_name(op->common.aml_opcode),
697                            walk_state->num_operands,
698                            "after AcpiExResolveOperands");
699
700         if (ACPI_FAILURE(status)) {
701                 ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)",
702                             acpi_ps_get_opcode_name(op->common.aml_opcode),
703                             status));
704
705                 return_ACPI_STATUS(status);
706         }
707
708         /* Initialize the Buffer Field */
709
710         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
711
712                 /* NOTE: Slightly different operands for this opcode */
713
714                 status =
715                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
716                                               walk_state->operands[0],
717                                               walk_state->operands[1],
718                                               walk_state->operands[2],
719                                               walk_state->operands[3]);
720         } else {
721                 /* All other, create_xxx_field opcodes */
722
723                 status =
724                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
725                                               walk_state->operands[0],
726                                               walk_state->operands[1], NULL,
727                                               walk_state->operands[2]);
728         }
729
730         return_ACPI_STATUS(status);
731 }
732
733 /*******************************************************************************
734  *
735  * FUNCTION:    acpi_ds_eval_region_operands
736  *
737  * PARAMETERS:  walk_state      - Current walk
738  *              Op              - A valid region Op object
739  *
740  * RETURN:      Status
741  *
742  * DESCRIPTION: Get region address and length
743  *              Called from acpi_ds_exec_end_op during op_region parse tree walk
744  *
745  ******************************************************************************/
746
747 acpi_status
748 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
749                              union acpi_parse_object *op)
750 {
751         acpi_status status;
752         union acpi_operand_object *obj_desc;
753         union acpi_operand_object *operand_desc;
754         struct acpi_namespace_node *node;
755         union acpi_parse_object *next_op;
756
757         ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
758
759         /*
760          * This is where we evaluate the address and length fields of the
761          * op_region declaration
762          */
763         node = op->common.node;
764
765         /* next_op points to the op that holds the space_iD */
766
767         next_op = op->common.value.arg;
768
769         /* next_op points to address op */
770
771         next_op = next_op->common.next;
772
773         /* Evaluate/create the address and length operands */
774
775         status = acpi_ds_create_operands(walk_state, next_op);
776         if (ACPI_FAILURE(status)) {
777                 return_ACPI_STATUS(status);
778         }
779
780         /* Resolve the length and address operands to numbers */
781
782         status = acpi_ex_resolve_operands(op->common.aml_opcode,
783                                           ACPI_WALK_OPERANDS, walk_state);
784         if (ACPI_FAILURE(status)) {
785                 return_ACPI_STATUS(status);
786         }
787
788         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
789                            acpi_ps_get_opcode_name(op->common.aml_opcode),
790                            1, "after AcpiExResolveOperands");
791
792         obj_desc = acpi_ns_get_attached_object(node);
793         if (!obj_desc) {
794                 return_ACPI_STATUS(AE_NOT_EXIST);
795         }
796
797         /*
798          * Get the length operand and save it
799          * (at Top of stack)
800          */
801         operand_desc = walk_state->operands[walk_state->num_operands - 1];
802
803         obj_desc->region.length = (u32) operand_desc->integer.value;
804         acpi_ut_remove_reference(operand_desc);
805
806         /*
807          * Get the address and save it
808          * (at top of stack - 1)
809          */
810         operand_desc = walk_state->operands[walk_state->num_operands - 2];
811
812         obj_desc->region.address = (acpi_physical_address)
813             operand_desc->integer.value;
814         acpi_ut_remove_reference(operand_desc);
815
816         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
817                           obj_desc,
818                           ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
819                           obj_desc->region.length));
820
821         /* Now the address and length are valid for this opregion */
822
823         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
824
825         return_ACPI_STATUS(status);
826 }
827
828 /*******************************************************************************
829  *
830  * FUNCTION:    acpi_ds_eval_table_region_operands
831  *
832  * PARAMETERS:  walk_state      - Current walk
833  *              Op              - A valid region Op object
834  *
835  * RETURN:      Status
836  *
837  * DESCRIPTION: Get region address and length
838  *              Called from acpi_ds_exec_end_op during data_table_region parse tree walk
839  *
840  ******************************************************************************/
841
842 acpi_status
843 acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
844                                    union acpi_parse_object *op)
845 {
846         acpi_status status;
847         union acpi_operand_object *obj_desc;
848         union acpi_operand_object **operand;
849         struct acpi_namespace_node *node;
850         union acpi_parse_object *next_op;
851         acpi_native_uint table_index;
852         struct acpi_table_header *table;
853
854         ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
855
856         /*
857          * This is where we evaluate the signature_string and oem_iDString
858          * and oem_table_iDString of the data_table_region declaration
859          */
860         node = op->common.node;
861
862         /* next_op points to signature_string op */
863
864         next_op = op->common.value.arg;
865
866         /*
867          * Evaluate/create the signature_string and oem_iDString
868          * and oem_table_iDString operands
869          */
870         status = acpi_ds_create_operands(walk_state, next_op);
871         if (ACPI_FAILURE(status)) {
872                 return_ACPI_STATUS(status);
873         }
874
875         /*
876          * Resolve the signature_string and oem_iDString
877          * and oem_table_iDString operands
878          */
879         status = acpi_ex_resolve_operands(op->common.aml_opcode,
880                                           ACPI_WALK_OPERANDS, walk_state);
881         if (ACPI_FAILURE(status)) {
882                 return_ACPI_STATUS(status);
883         }
884
885         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
886                            acpi_ps_get_opcode_name(op->common.aml_opcode),
887                            1, "after AcpiExResolveOperands");
888
889         operand = &walk_state->operands[0];
890
891         /* Find the ACPI table */
892
893         status = acpi_tb_find_table(operand[0]->string.pointer,
894                                     operand[1]->string.pointer,
895                                     operand[2]->string.pointer, &table_index);
896         if (ACPI_FAILURE(status)) {
897                 return_ACPI_STATUS(status);
898         }
899
900         acpi_ut_remove_reference(operand[0]);
901         acpi_ut_remove_reference(operand[1]);
902         acpi_ut_remove_reference(operand[2]);
903
904         status = acpi_get_table_by_index(table_index, &table);
905         if (ACPI_FAILURE(status)) {
906                 return_ACPI_STATUS(status);
907         }
908
909         obj_desc = acpi_ns_get_attached_object(node);
910         if (!obj_desc) {
911                 return_ACPI_STATUS(AE_NOT_EXIST);
912         }
913
914         obj_desc->region.address =
915             (acpi_physical_address) ACPI_TO_INTEGER(table);
916         obj_desc->region.length = table->length;
917
918         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
919                           obj_desc,
920                           ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
921                           obj_desc->region.length));
922
923         /* Now the address and length are valid for this opregion */
924
925         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
926
927         return_ACPI_STATUS(status);
928 }
929
930 /*******************************************************************************
931  *
932  * FUNCTION:    acpi_ds_eval_data_object_operands
933  *
934  * PARAMETERS:  walk_state      - Current walk
935  *              Op              - A valid data_object Op object
936  *              obj_desc        - data_object
937  *
938  * RETURN:      Status
939  *
940  * DESCRIPTION: Get the operands and complete the following data object types:
941  *              Buffer, Package.
942  *
943  ******************************************************************************/
944
945 acpi_status
946 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
947                                   union acpi_parse_object *op,
948                                   union acpi_operand_object *obj_desc)
949 {
950         acpi_status status;
951         union acpi_operand_object *arg_desc;
952         u32 length;
953
954         ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
955
956         /* The first operand (for all of these data objects) is the length */
957
958         /*
959          * Set proper index into operand stack for acpi_ds_obj_stack_push
960          * invoked inside acpi_ds_create_operand.
961          */
962         walk_state->operand_index = walk_state->num_operands;
963
964         status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
965         if (ACPI_FAILURE(status)) {
966                 return_ACPI_STATUS(status);
967         }
968
969         status = acpi_ex_resolve_operands(walk_state->opcode,
970                                           &(walk_state->
971                                             operands[walk_state->num_operands -
972                                                      1]), walk_state);
973         if (ACPI_FAILURE(status)) {
974                 return_ACPI_STATUS(status);
975         }
976
977         /* Extract length operand */
978
979         arg_desc = walk_state->operands[walk_state->num_operands - 1];
980         length = (u32) arg_desc->integer.value;
981
982         /* Cleanup for length operand */
983
984         status = acpi_ds_obj_stack_pop(1, walk_state);
985         if (ACPI_FAILURE(status)) {
986                 return_ACPI_STATUS(status);
987         }
988
989         acpi_ut_remove_reference(arg_desc);
990
991         /*
992          * Create the actual data object
993          */
994         switch (op->common.aml_opcode) {
995         case AML_BUFFER_OP:
996
997                 status =
998                     acpi_ds_build_internal_buffer_obj(walk_state, op, length,
999                                                       &obj_desc);
1000                 break;
1001
1002         case AML_PACKAGE_OP:
1003         case AML_VAR_PACKAGE_OP:
1004
1005                 status =
1006                     acpi_ds_build_internal_package_obj(walk_state, op, length,
1007                                                        &obj_desc);
1008                 break;
1009
1010         default:
1011                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
1012         }
1013
1014         if (ACPI_SUCCESS(status)) {
1015                 /*
1016                  * Return the object in the walk_state, unless the parent is a package -
1017                  * in this case, the return object will be stored in the parse tree
1018                  * for the package.
1019                  */
1020                 if ((!op->common.parent) ||
1021                     ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
1022                      (op->common.parent->common.aml_opcode !=
1023                       AML_VAR_PACKAGE_OP)
1024                      && (op->common.parent->common.aml_opcode != AML_NAME_OP))) {
1025                         walk_state->result_obj = obj_desc;
1026                 }
1027         }
1028
1029         return_ACPI_STATUS(status);
1030 }
1031
1032 /*******************************************************************************
1033  *
1034  * FUNCTION:    acpi_ds_eval_bank_field_operands
1035  *
1036  * PARAMETERS:  walk_state      - Current walk
1037  *              Op              - A valid bank_field Op object
1038  *
1039  * RETURN:      Status
1040  *
1041  * DESCRIPTION: Get bank_field bank_value
1042  *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
1043  *
1044  ******************************************************************************/
1045
1046 acpi_status
1047 acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
1048                                  union acpi_parse_object *op)
1049 {
1050         acpi_status status;
1051         union acpi_operand_object *obj_desc;
1052         union acpi_operand_object *operand_desc;
1053         struct acpi_namespace_node *node;
1054         union acpi_parse_object *next_op;
1055         union acpi_parse_object *arg;
1056
1057         ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
1058
1059         /*
1060          * This is where we evaluate the bank_value field of the
1061          * bank_field declaration
1062          */
1063
1064         /* next_op points to the op that holds the Region */
1065
1066         next_op = op->common.value.arg;
1067
1068         /* next_op points to the op that holds the Bank Register */
1069
1070         next_op = next_op->common.next;
1071
1072         /* next_op points to the op that holds the Bank Value */
1073
1074         next_op = next_op->common.next;
1075
1076         /*
1077          * Set proper index into operand stack for acpi_ds_obj_stack_push
1078          * invoked inside acpi_ds_create_operand.
1079          *
1080          * We use walk_state->Operands[0] to store the evaluated bank_value
1081          */
1082         walk_state->operand_index = 0;
1083
1084         status = acpi_ds_create_operand(walk_state, next_op, 0);
1085         if (ACPI_FAILURE(status)) {
1086                 return_ACPI_STATUS(status);
1087         }
1088
1089         status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
1090         if (ACPI_FAILURE(status)) {
1091                 return_ACPI_STATUS(status);
1092         }
1093
1094         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
1095                            acpi_ps_get_opcode_name(op->common.aml_opcode),
1096                            1, "after AcpiExResolveOperands");
1097
1098         /*
1099          * Get the bank_value operand and save it
1100          * (at Top of stack)
1101          */
1102         operand_desc = walk_state->operands[0];
1103
1104         /* Arg points to the start Bank Field */
1105
1106         arg = acpi_ps_get_arg(op, 4);
1107         while (arg) {
1108
1109                 /* Ignore OFFSET and ACCESSAS terms here */
1110
1111                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
1112                         node = arg->common.node;
1113
1114                         obj_desc = acpi_ns_get_attached_object(node);
1115                         if (!obj_desc) {
1116                                 return_ACPI_STATUS(AE_NOT_EXIST);
1117                         }
1118
1119                         obj_desc->bank_field.value =
1120                             (u32) operand_desc->integer.value;
1121                 }
1122
1123                 /* Move to next field in the list */
1124
1125                 arg = arg->common.next;
1126         }
1127
1128         acpi_ut_remove_reference(operand_desc);
1129         return_ACPI_STATUS(status);
1130 }
1131
1132 /*******************************************************************************
1133  *
1134  * FUNCTION:    acpi_ds_exec_begin_control_op
1135  *
1136  * PARAMETERS:  walk_list       - The list that owns the walk stack
1137  *              Op              - The control Op
1138  *
1139  * RETURN:      Status
1140  *
1141  * DESCRIPTION: Handles all control ops encountered during control method
1142  *              execution.
1143  *
1144  ******************************************************************************/
1145
1146 acpi_status
1147 acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
1148                               union acpi_parse_object *op)
1149 {
1150         acpi_status status = AE_OK;
1151         union acpi_generic_state *control_state;
1152
1153         ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
1154
1155         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
1156                           op->common.aml_opcode, walk_state));
1157
1158         switch (op->common.aml_opcode) {
1159         case AML_IF_OP:
1160         case AML_WHILE_OP:
1161
1162                 /*
1163                  * IF/WHILE: Create a new control state to manage these
1164                  * constructs. We need to manage these as a stack, in order
1165                  * to handle nesting.
1166                  */
1167                 control_state = acpi_ut_create_control_state();
1168                 if (!control_state) {
1169                         status = AE_NO_MEMORY;
1170                         break;
1171                 }
1172                 /*
1173                  * Save a pointer to the predicate for multiple executions
1174                  * of a loop
1175                  */
1176                 control_state->control.aml_predicate_start =
1177                     walk_state->parser_state.aml - 1;
1178                 control_state->control.package_end =
1179                     walk_state->parser_state.pkg_end;
1180                 control_state->control.opcode = op->common.aml_opcode;
1181
1182                 /* Push the control state on this walk's control stack */
1183
1184                 acpi_ut_push_generic_state(&walk_state->control_state,
1185                                            control_state);
1186                 break;
1187
1188         case AML_ELSE_OP:
1189
1190                 /* Predicate is in the state object */
1191                 /* If predicate is true, the IF was executed, ignore ELSE part */
1192
1193                 if (walk_state->last_predicate) {
1194                         status = AE_CTRL_TRUE;
1195                 }
1196
1197                 break;
1198
1199         case AML_RETURN_OP:
1200
1201                 break;
1202
1203         default:
1204                 break;
1205         }
1206
1207         return (status);
1208 }
1209
1210 /*******************************************************************************
1211  *
1212  * FUNCTION:    acpi_ds_exec_end_control_op
1213  *
1214  * PARAMETERS:  walk_list       - The list that owns the walk stack
1215  *              Op              - The control Op
1216  *
1217  * RETURN:      Status
1218  *
1219  * DESCRIPTION: Handles all control ops encountered during control method
1220  *              execution.
1221  *
1222  ******************************************************************************/
1223
1224 acpi_status
1225 acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
1226                             union acpi_parse_object * op)
1227 {
1228         acpi_status status = AE_OK;
1229         union acpi_generic_state *control_state;
1230
1231         ACPI_FUNCTION_NAME(ds_exec_end_control_op);
1232
1233         switch (op->common.aml_opcode) {
1234         case AML_IF_OP:
1235
1236                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
1237
1238                 /*
1239                  * Save the result of the predicate in case there is an
1240                  * ELSE to come
1241                  */
1242                 walk_state->last_predicate =
1243                     (u8) walk_state->control_state->common.value;
1244
1245                 /*
1246                  * Pop the control state that was created at the start
1247                  * of the IF and free it
1248                  */
1249                 control_state =
1250                     acpi_ut_pop_generic_state(&walk_state->control_state);
1251                 acpi_ut_delete_generic_state(control_state);
1252                 break;
1253
1254         case AML_ELSE_OP:
1255
1256                 break;
1257
1258         case AML_WHILE_OP:
1259
1260                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
1261
1262                 if (walk_state->control_state->common.value) {
1263
1264                         /* Predicate was true, go back and evaluate it again! */
1265
1266                         status = AE_CTRL_PENDING;
1267                 }
1268
1269                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1270                                   "[WHILE_OP] termination! Op=%p\n", op));
1271
1272                 /* Pop this control state and free it */
1273
1274                 control_state =
1275                     acpi_ut_pop_generic_state(&walk_state->control_state);
1276
1277                 walk_state->aml_last_while =
1278                     control_state->control.aml_predicate_start;
1279                 acpi_ut_delete_generic_state(control_state);
1280                 break;
1281
1282         case AML_RETURN_OP:
1283
1284                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1285                                   "[RETURN_OP] Op=%p Arg=%p\n", op,
1286                                   op->common.value.arg));
1287
1288                 /*
1289                  * One optional operand -- the return value
1290                  * It can be either an immediate operand or a result that
1291                  * has been bubbled up the tree
1292                  */
1293                 if (op->common.value.arg) {
1294
1295                         /* Since we have a real Return(), delete any implicit return */
1296
1297                         acpi_ds_clear_implicit_return(walk_state);
1298
1299                         /* Return statement has an immediate operand */
1300
1301                         status =
1302                             acpi_ds_create_operands(walk_state,
1303                                                     op->common.value.arg);
1304                         if (ACPI_FAILURE(status)) {
1305                                 return (status);
1306                         }
1307
1308                         /*
1309                          * If value being returned is a Reference (such as
1310                          * an arg or local), resolve it now because it may
1311                          * cease to exist at the end of the method.
1312                          */
1313                         status =
1314                             acpi_ex_resolve_to_value(&walk_state->operands[0],
1315                                                      walk_state);
1316                         if (ACPI_FAILURE(status)) {
1317                                 return (status);
1318                         }
1319
1320                         /*
1321                          * Get the return value and save as the last result
1322                          * value.  This is the only place where walk_state->return_desc
1323                          * is set to anything other than zero!
1324                          */
1325                         walk_state->return_desc = walk_state->operands[0];
1326                 } else if (walk_state->result_count) {
1327
1328                         /* Since we have a real Return(), delete any implicit return */
1329
1330                         acpi_ds_clear_implicit_return(walk_state);
1331
1332                         /*
1333                          * The return value has come from a previous calculation.
1334                          *
1335                          * If value being returned is a Reference (such as
1336                          * an arg or local), resolve it now because it may
1337                          * cease to exist at the end of the method.
1338                          *
1339                          * Allow references created by the Index operator to return unchanged.
1340                          */
1341                         if ((ACPI_GET_DESCRIPTOR_TYPE
1342                              (walk_state->results->results.obj_desc[0]) ==
1343                              ACPI_DESC_TYPE_OPERAND)
1344                             &&
1345                             (ACPI_GET_OBJECT_TYPE
1346                              (walk_state->results->results.obj_desc[0]) ==
1347                              ACPI_TYPE_LOCAL_REFERENCE)
1348                             && ((walk_state->results->results.obj_desc[0])->
1349                                 reference.opcode != AML_INDEX_OP)) {
1350                                 status =
1351                                     acpi_ex_resolve_to_value(&walk_state->
1352                                                              results->results.
1353                                                              obj_desc[0],
1354                                                              walk_state);
1355                                 if (ACPI_FAILURE(status)) {
1356                                         return (status);
1357                                 }
1358                         }
1359
1360                         walk_state->return_desc =
1361                             walk_state->results->results.obj_desc[0];
1362                 } else {
1363                         /* No return operand */
1364
1365                         if (walk_state->num_operands) {
1366                                 acpi_ut_remove_reference(walk_state->
1367                                                          operands[0]);
1368                         }
1369
1370                         walk_state->operands[0] = NULL;
1371                         walk_state->num_operands = 0;
1372                         walk_state->return_desc = NULL;
1373                 }
1374
1375                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1376                                   "Completed RETURN_OP State=%p, RetVal=%p\n",
1377                                   walk_state, walk_state->return_desc));
1378
1379                 /* End the control method execution right now */
1380
1381                 status = AE_CTRL_TERMINATE;
1382                 break;
1383
1384         case AML_NOOP_OP:
1385
1386                 /* Just do nothing! */
1387                 break;
1388
1389         case AML_BREAK_POINT_OP:
1390
1391                 /* Call up to the OS service layer to handle this */
1392
1393                 status =
1394                     acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
1395                                    "Executed AML Breakpoint opcode");
1396
1397                 /* If and when it returns, all done. */
1398
1399                 break;
1400
1401         case AML_BREAK_OP:
1402         case AML_CONTINUE_OP:   /* ACPI 2.0 */
1403
1404                 /* Pop and delete control states until we find a while */
1405
1406                 while (walk_state->control_state &&
1407                        (walk_state->control_state->control.opcode !=
1408                         AML_WHILE_OP)) {
1409                         control_state =
1410                             acpi_ut_pop_generic_state(&walk_state->
1411                                                       control_state);
1412                         acpi_ut_delete_generic_state(control_state);
1413                 }
1414
1415                 /* No while found? */
1416
1417                 if (!walk_state->control_state) {
1418                         return (AE_AML_NO_WHILE);
1419                 }
1420
1421                 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
1422
1423                 walk_state->aml_last_while =
1424                     walk_state->control_state->control.package_end;
1425
1426                 /* Return status depending on opcode */
1427
1428                 if (op->common.aml_opcode == AML_BREAK_OP) {
1429                         status = AE_CTRL_BREAK;
1430                 } else {
1431                         status = AE_CTRL_CONTINUE;
1432                 }
1433                 break;
1434
1435         default:
1436
1437                 ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p",
1438                             op->common.aml_opcode, op));
1439
1440                 status = AE_AML_BAD_OPCODE;
1441                 break;
1442         }
1443
1444         return (status);
1445 }