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ACPI: remove unused "status_changed" return value from Check Device handling
[linux-2.6/x86.git] / drivers / acpi / acpica / dsopcode.c
blobb4c87b5053e6d1c6daeff5d68013672466061378
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 "accommon.h"
47 #include "acparser.h"
48 #include "amlcode.h"
49 #include "acdispat.h"
50 #include "acinterp.h"
51 #include "acnamesp.h"
52 #include "acevents.h"
53 #include "actables.h"
54
55 #define _COMPONENT ACPI_DISPATCHER
56 ACPI_MODULE_NAME("dsopcode")
57
58 /* Local prototypes */
59 static acpi_status
60 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
61 struct acpi_namespace_node *scope_node,
62 u32 aml_length, u8 * aml_start);
63
64 static acpi_status
65 acpi_ds_init_buffer_field(u16 aml_opcode,
66 union acpi_operand_object *obj_desc,
67 union acpi_operand_object *buffer_desc,
68 union acpi_operand_object *offset_desc,
69 union acpi_operand_object *length_desc,
70 union acpi_operand_object *result_desc);
71
72 /*******************************************************************************
73 *
74 * FUNCTION: acpi_ds_execute_arguments
75 *
76 * PARAMETERS: Node - Object NS node
77 * scope_node - Parent NS node
78 * aml_length - Length of executable AML
79 * aml_start - Pointer to the AML
80 *
81 * RETURN: Status.
82 *
83 * DESCRIPTION: Late (deferred) execution of region or field arguments
84 *
85 ******************************************************************************/
86
87 static acpi_status
88 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
89 struct acpi_namespace_node *scope_node,
90 u32 aml_length, u8 * aml_start)
91 {
92 acpi_status status;
93 union acpi_parse_object *op;
94 struct acpi_walk_state *walk_state;
95
96 ACPI_FUNCTION_TRACE(ds_execute_arguments);
97
98 /*
99 * Allocate a new parser op to be the root of the parsed tree
100 */
101 op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
102 if (!op) {
103 return_ACPI_STATUS(AE_NO_MEMORY);
104 }
105
106 /* Save the Node for use in acpi_ps_parse_aml */
107
108 op->common.node = scope_node;
109
110 /* Create and initialize a new parser state */
111
112 walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
113 if (!walk_state) {
114 status = AE_NO_MEMORY;
115 goto cleanup;
116 }
117
118 status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
119 aml_length, NULL, ACPI_IMODE_LOAD_PASS1);
120 if (ACPI_FAILURE(status)) {
121 acpi_ds_delete_walk_state(walk_state);
122 goto cleanup;
123 }
124
125 /* Mark this parse as a deferred opcode */
126
127 walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP;
128 walk_state->deferred_node = node;
129
130 /* Pass1: Parse the entire declaration */
131
132 status = acpi_ps_parse_aml(walk_state);
133 if (ACPI_FAILURE(status)) {
134 goto cleanup;
135 }
136
137 /* Get and init the Op created above */
138
139 op->common.node = node;
140 acpi_ps_delete_parse_tree(op);
141
142 /* Evaluate the deferred arguments */
143
144 op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
145 if (!op) {
146 return_ACPI_STATUS(AE_NO_MEMORY);
147 }
148
149 op->common.node = scope_node;
150
151 /* Create and initialize a new parser state */
152
153 walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
154 if (!walk_state) {
155 status = AE_NO_MEMORY;
156 goto cleanup;
157 }
158
159 /* Execute the opcode and arguments */
160
161 status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
162 aml_length, NULL, ACPI_IMODE_EXECUTE);
163 if (ACPI_FAILURE(status)) {
164 acpi_ds_delete_walk_state(walk_state);
165 goto cleanup;
166 }
167
168 /* Mark this execution as a deferred opcode */
169
170 walk_state->deferred_node = node;
171 status = acpi_ps_parse_aml(walk_state);
172
173 cleanup:
174 acpi_ps_delete_parse_tree(op);
175 return_ACPI_STATUS(status);
176 }
177
178 /*******************************************************************************
179 *
180 * FUNCTION: acpi_ds_get_buffer_field_arguments
181 *
182 * PARAMETERS: obj_desc - A valid buffer_field object
183 *
184 * RETURN: Status.
185 *
186 * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late
187 * evaluation of these field attributes.
188 *
189 ******************************************************************************/
190
191 acpi_status
192 acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
193 {
194 union acpi_operand_object *extra_desc;
195 struct acpi_namespace_node *node;
196 acpi_status status;
197
198 ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_field_arguments, obj_desc);
199
200 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
201 return_ACPI_STATUS(AE_OK);
202 }
203
204 /* Get the AML pointer (method object) and buffer_field node */
205
206 extra_desc = acpi_ns_get_secondary_object(obj_desc);
207 node = obj_desc->buffer_field.node;
208
209 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
210 (ACPI_TYPE_BUFFER_FIELD, node, NULL));
211 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BufferField Arg Init\n",
212 acpi_ut_get_node_name(node)));
213
214 /* Execute the AML code for the term_arg arguments */
215
216 status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
217 extra_desc->extra.aml_length,
218 extra_desc->extra.aml_start);
219 return_ACPI_STATUS(status);
220 }
221
222 /*******************************************************************************
223 *
224 * FUNCTION: acpi_ds_get_bank_field_arguments
225 *
226 * PARAMETERS: obj_desc - A valid bank_field object
227 *
228 * RETURN: Status.
229 *
230 * DESCRIPTION: Get bank_field bank_value. This implements the late
231 * evaluation of these field attributes.
232 *
233 ******************************************************************************/
234
235 acpi_status
236 acpi_ds_get_bank_field_arguments(union acpi_operand_object *obj_desc)
237 {
238 union acpi_operand_object *extra_desc;
239 struct acpi_namespace_node *node;
240 acpi_status status;
241
242 ACPI_FUNCTION_TRACE_PTR(ds_get_bank_field_arguments, obj_desc);
243
244 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
245 return_ACPI_STATUS(AE_OK);
246 }
247
248 /* Get the AML pointer (method object) and bank_field node */
249
250 extra_desc = acpi_ns_get_secondary_object(obj_desc);
251 node = obj_desc->bank_field.node;
252
253 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
254 (ACPI_TYPE_LOCAL_BANK_FIELD, node, NULL));
255 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BankField Arg Init\n",
256 acpi_ut_get_node_name(node)));
257
258 /* Execute the AML code for the term_arg arguments */
259
260 status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
261 extra_desc->extra.aml_length,
262 extra_desc->extra.aml_start);
263 return_ACPI_STATUS(status);
264 }
265
266 /*******************************************************************************
267 *
268 * FUNCTION: acpi_ds_get_buffer_arguments
269 *
270 * PARAMETERS: obj_desc - A valid Buffer object
271 *
272 * RETURN: Status.
273 *
274 * DESCRIPTION: Get Buffer length and initializer byte list. This implements
275 * the late evaluation of these attributes.
276 *
277 ******************************************************************************/
278
279 acpi_status acpi_ds_get_buffer_arguments(union acpi_operand_object *obj_desc)
280 {
281 struct acpi_namespace_node *node;
282 acpi_status status;
283
284 ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_arguments, obj_desc);
285
286 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
287 return_ACPI_STATUS(AE_OK);
288 }
289
290 /* Get the Buffer node */
291
292 node = obj_desc->buffer.node;
293 if (!node) {
294 ACPI_ERROR((AE_INFO,
295 "No pointer back to NS node in buffer obj %p",
296 obj_desc));
297 return_ACPI_STATUS(AE_AML_INTERNAL);
298 }
299
300 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n"));
301
302 /* Execute the AML code for the term_arg arguments */
303
304 status = acpi_ds_execute_arguments(node, node,
305 obj_desc->buffer.aml_length,
306 obj_desc->buffer.aml_start);
307 return_ACPI_STATUS(status);
308 }
309
310 /*******************************************************************************
311 *
312 * FUNCTION: acpi_ds_get_package_arguments
313 *
314 * PARAMETERS: obj_desc - A valid Package object
315 *
316 * RETURN: Status.
317 *
318 * DESCRIPTION: Get Package length and initializer byte list. This implements
319 * the late evaluation of these attributes.
320 *
321 ******************************************************************************/
322
323 acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc)
324 {
325 struct acpi_namespace_node *node;
326 acpi_status status;
327
328 ACPI_FUNCTION_TRACE_PTR(ds_get_package_arguments, obj_desc);
329
330 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
331 return_ACPI_STATUS(AE_OK);
332 }
333
334 /* Get the Package node */
335
336 node = obj_desc->package.node;
337 if (!node) {
338 ACPI_ERROR((AE_INFO,
339 "No pointer back to NS node in package %p",
340 obj_desc));
341 return_ACPI_STATUS(AE_AML_INTERNAL);
342 }
343
344 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n"));
345
346 /* Execute the AML code for the term_arg arguments */
347
348 status = acpi_ds_execute_arguments(node, node,
349 obj_desc->package.aml_length,
350 obj_desc->package.aml_start);
351 return_ACPI_STATUS(status);
352 }
353
354 /*****************************************************************************
355 *
356 * FUNCTION: acpi_ds_get_region_arguments
357 *
358 * PARAMETERS: obj_desc - A valid region object
359 *
360 * RETURN: Status.
361 *
362 * DESCRIPTION: Get region address and length. This implements the late
363 * evaluation of these region attributes.
364 *
365 ****************************************************************************/
366
367 acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
368 {
369 struct acpi_namespace_node *node;
370 acpi_status status;
371 union acpi_operand_object *extra_desc;
372
373 ACPI_FUNCTION_TRACE_PTR(ds_get_region_arguments, obj_desc);
374
375 if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
376 return_ACPI_STATUS(AE_OK);
377 }
378
379 extra_desc = acpi_ns_get_secondary_object(obj_desc);
380 if (!extra_desc) {
381 return_ACPI_STATUS(AE_NOT_EXIST);
382 }
383
384 /* Get the Region node */
385
386 node = obj_desc->region.node;
387
388 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
389 (ACPI_TYPE_REGION, node, NULL));
390
391 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] OpRegion Arg Init at AML %p\n",
392 acpi_ut_get_node_name(node),
393 extra_desc->extra.aml_start));
394
395 /* Execute the argument AML */
396
397 status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
398 extra_desc->extra.aml_length,
399 extra_desc->extra.aml_start);
400 return_ACPI_STATUS(status);
401 }
402
403 /*******************************************************************************
404 *
405 * FUNCTION: acpi_ds_initialize_region
406 *
407 * PARAMETERS: obj_handle - Region namespace node
408 *
409 * RETURN: Status
410 *
411 * DESCRIPTION: Front end to ev_initialize_region
412 *
413 ******************************************************************************/
414
415 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
416 {
417 union acpi_operand_object *obj_desc;
418 acpi_status status;
419
420 obj_desc = acpi_ns_get_attached_object(obj_handle);
421
422 /* Namespace is NOT locked */
423
424 status = acpi_ev_initialize_region(obj_desc, FALSE);
425 return (status);
426 }
427
428 /*******************************************************************************
429 *
430 * FUNCTION: acpi_ds_init_buffer_field
431 *
432 * PARAMETERS: aml_opcode - create_xxx_field
433 * obj_desc - buffer_field object
434 * buffer_desc - Host Buffer
435 * offset_desc - Offset into buffer
436 * length_desc - Length of field (CREATE_FIELD_OP only)
437 * result_desc - Where to store the result
438 *
439 * RETURN: Status
440 *
441 * DESCRIPTION: Perform actual initialization of a buffer field
442 *
443 ******************************************************************************/
444
445 static acpi_status
446 acpi_ds_init_buffer_field(u16 aml_opcode,
447 union acpi_operand_object *obj_desc,
448 union acpi_operand_object *buffer_desc,
449 union acpi_operand_object *offset_desc,
450 union acpi_operand_object *length_desc,
451 union acpi_operand_object *result_desc)
452 {
453 u32 offset;
454 u32 bit_offset;
455 u32 bit_count;
456 u8 field_flags;
457 acpi_status status;
458
459 ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
460
461 /* Host object must be a Buffer */
462
463 if (buffer_desc->common.type != ACPI_TYPE_BUFFER) {
464 ACPI_ERROR((AE_INFO,
465 "Target of Create Field is not a Buffer object - %s",
466 acpi_ut_get_object_type_name(buffer_desc)));
467
468 status = AE_AML_OPERAND_TYPE;
469 goto cleanup;
470 }
471
472 /*
473 * The last parameter to all of these opcodes (result_desc) started
474 * out as a name_string, and should therefore now be a NS node
475 * after resolution in acpi_ex_resolve_operands().
476 */
477 if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
478 ACPI_ERROR((AE_INFO,
479 "(%s) destination not a NS Node [%s]",
480 acpi_ps_get_opcode_name(aml_opcode),
481 acpi_ut_get_descriptor_name(result_desc)));
482
483 status = AE_AML_OPERAND_TYPE;
484 goto cleanup;
485 }
486
487 offset = (u32) offset_desc->integer.value;
488
489 /*
490 * Setup the Bit offsets and counts, according to the opcode
491 */
492 switch (aml_opcode) {
493 case AML_CREATE_FIELD_OP:
494
495 /* Offset is in bits, count is in bits */
496
497 field_flags = AML_FIELD_ACCESS_BYTE;
498 bit_offset = offset;
499 bit_count = (u32) length_desc->integer.value;
500
501 /* Must have a valid (>0) bit count */
502
503 if (bit_count == 0) {
504 ACPI_ERROR((AE_INFO,
505 "Attempt to CreateField of length zero"));
506 status = AE_AML_OPERAND_VALUE;
507 goto cleanup;
508 }
509 break;
510
511 case AML_CREATE_BIT_FIELD_OP:
512
513 /* Offset is in bits, Field is one bit */
514
515 bit_offset = offset;
516 bit_count = 1;
517 field_flags = AML_FIELD_ACCESS_BYTE;
518 break;
519
520 case AML_CREATE_BYTE_FIELD_OP:
521
522 /* Offset is in bytes, field is one byte */
523
524 bit_offset = 8 * offset;
525 bit_count = 8;
526 field_flags = AML_FIELD_ACCESS_BYTE;
527 break;
528
529 case AML_CREATE_WORD_FIELD_OP:
530
531 /* Offset is in bytes, field is one word */
532
533 bit_offset = 8 * offset;
534 bit_count = 16;
535 field_flags = AML_FIELD_ACCESS_WORD;
536 break;
537
538 case AML_CREATE_DWORD_FIELD_OP:
539
540 /* Offset is in bytes, field is one dword */
541
542 bit_offset = 8 * offset;
543 bit_count = 32;
544 field_flags = AML_FIELD_ACCESS_DWORD;
545 break;
546
547 case AML_CREATE_QWORD_FIELD_OP:
548
549 /* Offset is in bytes, field is one qword */
550
551 bit_offset = 8 * offset;
552 bit_count = 64;
553 field_flags = AML_FIELD_ACCESS_QWORD;
554 break;
555
556 default:
557
558 ACPI_ERROR((AE_INFO,
559 "Unknown field creation opcode %02x", aml_opcode));
560 status = AE_AML_BAD_OPCODE;
561 goto cleanup;
562 }
563
564 /* Entire field must fit within the current length of the buffer */
565
566 if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
567 ACPI_ERROR((AE_INFO,
568 "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)",
569 acpi_ut_get_node_name(result_desc),
570 bit_offset + bit_count,
571 acpi_ut_get_node_name(buffer_desc->buffer.node),
572 8 * (u32) buffer_desc->buffer.length));
573 status = AE_AML_BUFFER_LIMIT;
574 goto cleanup;
575 }
576
577 /*
578 * Initialize areas of the field object that are common to all fields
579 * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
580 * UPDATE_RULE = 0 (UPDATE_PRESERVE)
581 */
582 status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
583 bit_offset, bit_count);
584 if (ACPI_FAILURE(status)) {
585 goto cleanup;
586 }
587
588 obj_desc->buffer_field.buffer_obj = buffer_desc;
589
590 /* Reference count for buffer_desc inherits obj_desc count */
591
592 buffer_desc->common.reference_count = (u16)
593 (buffer_desc->common.reference_count +
594 obj_desc->common.reference_count);
595
596 cleanup:
597
598 /* Always delete the operands */
599
600 acpi_ut_remove_reference(offset_desc);
601 acpi_ut_remove_reference(buffer_desc);
602
603 if (aml_opcode == AML_CREATE_FIELD_OP) {
604 acpi_ut_remove_reference(length_desc);
605 }
606
607 /* On failure, delete the result descriptor */
608
609 if (ACPI_FAILURE(status)) {
610 acpi_ut_remove_reference(result_desc); /* Result descriptor */
611 } else {
612 /* Now the address and length are valid for this buffer_field */
613
614 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
615 }
616
617 return_ACPI_STATUS(status);
618 }
619
620 /*******************************************************************************
621 *
622 * FUNCTION: acpi_ds_eval_buffer_field_operands
623 *
624 * PARAMETERS: walk_state - Current walk
625 * Op - A valid buffer_field Op object
626 *
627 * RETURN: Status
628 *
629 * DESCRIPTION: Get buffer_field Buffer and Index
630 * Called from acpi_ds_exec_end_op during buffer_field parse tree walk
631 *
632 ******************************************************************************/
633
634 acpi_status
635 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
636 union acpi_parse_object *op)
637 {
638 acpi_status status;
639 union acpi_operand_object *obj_desc;
640 struct acpi_namespace_node *node;
641 union acpi_parse_object *next_op;
642
643 ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
644
645 /*
646 * This is where we evaluate the address and length fields of the
647 * create_xxx_field declaration
648 */
649 node = op->common.node;
650
651 /* next_op points to the op that holds the Buffer */
652
653 next_op = op->common.value.arg;
654
655 /* Evaluate/create the address and length operands */
656
657 status = acpi_ds_create_operands(walk_state, next_op);
658 if (ACPI_FAILURE(status)) {
659 return_ACPI_STATUS(status);
660 }
661
662 obj_desc = acpi_ns_get_attached_object(node);
663 if (!obj_desc) {
664 return_ACPI_STATUS(AE_NOT_EXIST);
665 }
666
667 /* Resolve the operands */
668
669 status = acpi_ex_resolve_operands(op->common.aml_opcode,
670 ACPI_WALK_OPERANDS, walk_state);
671 if (ACPI_FAILURE(status)) {
672 ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)",
673 acpi_ps_get_opcode_name(op->common.aml_opcode),
674 status));
675
676 return_ACPI_STATUS(status);
677 }
678
679 /* Initialize the Buffer Field */
680
681 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
682
683 /* NOTE: Slightly different operands for this opcode */
684
685 status =
686 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
687 walk_state->operands[0],
688 walk_state->operands[1],
689 walk_state->operands[2],
690 walk_state->operands[3]);
691 } else {
692 /* All other, create_xxx_field opcodes */
693
694 status =
695 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
696 walk_state->operands[0],
697 walk_state->operands[1], NULL,
698 walk_state->operands[2]);
699 }
700
701 return_ACPI_STATUS(status);
702 }
703
704 /*******************************************************************************
705 *
706 * FUNCTION: acpi_ds_eval_region_operands
707 *
708 * PARAMETERS: walk_state - Current walk
709 * Op - A valid region Op object
710 *
711 * RETURN: Status
712 *
713 * DESCRIPTION: Get region address and length
714 * Called from acpi_ds_exec_end_op during op_region parse tree walk
715 *
716 ******************************************************************************/
717
718 acpi_status
719 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
720 union acpi_parse_object *op)
721 {
722 acpi_status status;
723 union acpi_operand_object *obj_desc;
724 union acpi_operand_object *operand_desc;
725 struct acpi_namespace_node *node;
726 union acpi_parse_object *next_op;
727
728 ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
729
730 /*
731 * This is where we evaluate the address and length fields of the
732 * op_region declaration
733 */
734 node = op->common.node;
735
736 /* next_op points to the op that holds the space_iD */
737
738 next_op = op->common.value.arg;
739
740 /* next_op points to address op */
741
742 next_op = next_op->common.next;
743
744 /* Evaluate/create the address and length operands */
745
746 status = acpi_ds_create_operands(walk_state, next_op);
747 if (ACPI_FAILURE(status)) {
748 return_ACPI_STATUS(status);
749 }
750
751 /* Resolve the length and address operands to numbers */
752
753 status = acpi_ex_resolve_operands(op->common.aml_opcode,
754 ACPI_WALK_OPERANDS, walk_state);
755 if (ACPI_FAILURE(status)) {
756 return_ACPI_STATUS(status);
757 }
758
759 obj_desc = acpi_ns_get_attached_object(node);
760 if (!obj_desc) {
761 return_ACPI_STATUS(AE_NOT_EXIST);
762 }
763
764 /*
765 * Get the length operand and save it
766 * (at Top of stack)
767 */
768 operand_desc = walk_state->operands[walk_state->num_operands - 1];
769
770 obj_desc->region.length = (u32) operand_desc->integer.value;
771 acpi_ut_remove_reference(operand_desc);
772
773 /*
774 * Get the address and save it
775 * (at top of stack - 1)
776 */
777 operand_desc = walk_state->operands[walk_state->num_operands - 2];
778
779 obj_desc->region.address = (acpi_physical_address)
780 operand_desc->integer.value;
781 acpi_ut_remove_reference(operand_desc);
782
783 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
784 obj_desc,
785 ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
786 obj_desc->region.length));
787
788 /* Now the address and length are valid for this opregion */
789
790 obj_desc->region.flags |= AOPOBJ_DATA_VALID;
791
792 return_ACPI_STATUS(status);
793 }
794
795 /*******************************************************************************
796 *
797 * FUNCTION: acpi_ds_eval_table_region_operands
798 *
799 * PARAMETERS: walk_state - Current walk
800 * Op - A valid region Op object
801 *
802 * RETURN: Status
803 *
804 * DESCRIPTION: Get region address and length
805 * Called from acpi_ds_exec_end_op during data_table_region parse tree walk
806 *
807 ******************************************************************************/
808
809 acpi_status
810 acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
811 union acpi_parse_object *op)
812 {
813 acpi_status status;
814 union acpi_operand_object *obj_desc;
815 union acpi_operand_object **operand;
816 struct acpi_namespace_node *node;
817 union acpi_parse_object *next_op;
818 u32 table_index;
819 struct acpi_table_header *table;
820
821 ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
822
823 /*
824 * This is where we evaluate the signature_string and oem_iDString
825 * and oem_table_iDString of the data_table_region declaration
826 */
827 node = op->common.node;
828
829 /* next_op points to signature_string op */
830
831 next_op = op->common.value.arg;
832
833 /*
834 * Evaluate/create the signature_string and oem_iDString
835 * and oem_table_iDString operands
836 */
837 status = acpi_ds_create_operands(walk_state, next_op);
838 if (ACPI_FAILURE(status)) {
839 return_ACPI_STATUS(status);
840 }
841
842 /*
843 * Resolve the signature_string and oem_iDString
844 * and oem_table_iDString operands
845 */
846 status = acpi_ex_resolve_operands(op->common.aml_opcode,
847 ACPI_WALK_OPERANDS, walk_state);
848 if (ACPI_FAILURE(status)) {
849 return_ACPI_STATUS(status);
850 }
851
852 operand = &walk_state->operands[0];
853
854 /* Find the ACPI table */
855
856 status = acpi_tb_find_table(operand[0]->string.pointer,
857 operand[1]->string.pointer,
858 operand[2]->string.pointer, &table_index);
859 if (ACPI_FAILURE(status)) {
860 return_ACPI_STATUS(status);
861 }
862
863 acpi_ut_remove_reference(operand[0]);
864 acpi_ut_remove_reference(operand[1]);
865 acpi_ut_remove_reference(operand[2]);
866
867 status = acpi_get_table_by_index(table_index, &table);
868 if (ACPI_FAILURE(status)) {
869 return_ACPI_STATUS(status);
870 }
871
872 obj_desc = acpi_ns_get_attached_object(node);
873 if (!obj_desc) {
874 return_ACPI_STATUS(AE_NOT_EXIST);
875 }
876
877 obj_desc->region.address =
878 (acpi_physical_address) ACPI_TO_INTEGER(table);
879 obj_desc->region.length = table->length;
880
881 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
882 obj_desc,
883 ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
884 obj_desc->region.length));
885
886 /* Now the address and length are valid for this opregion */
887
888 obj_desc->region.flags |= AOPOBJ_DATA_VALID;
889
890 return_ACPI_STATUS(status);
891 }
892
893 /*******************************************************************************
894 *
895 * FUNCTION: acpi_ds_eval_data_object_operands
896 *
897 * PARAMETERS: walk_state - Current walk
898 * Op - A valid data_object Op object
899 * obj_desc - data_object
900 *
901 * RETURN: Status
902 *
903 * DESCRIPTION: Get the operands and complete the following data object types:
904 * Buffer, Package.
905 *
906 ******************************************************************************/
907
908 acpi_status
909 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
910 union acpi_parse_object *op,
911 union acpi_operand_object *obj_desc)
912 {
913 acpi_status status;
914 union acpi_operand_object *arg_desc;
915 u32 length;
916
917 ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
918
919 /* The first operand (for all of these data objects) is the length */
920
921 /*
922 * Set proper index into operand stack for acpi_ds_obj_stack_push
923 * invoked inside acpi_ds_create_operand.
924 */
925 walk_state->operand_index = walk_state->num_operands;
926
927 status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
928 if (ACPI_FAILURE(status)) {
929 return_ACPI_STATUS(status);
930 }
931
932 status = acpi_ex_resolve_operands(walk_state->opcode,
933 &(walk_state->
934 operands[walk_state->num_operands -
935 1]), walk_state);
936 if (ACPI_FAILURE(status)) {
937 return_ACPI_STATUS(status);
938 }
939
940 /* Extract length operand */
941
942 arg_desc = walk_state->operands[walk_state->num_operands - 1];
943 length = (u32) arg_desc->integer.value;
944
945 /* Cleanup for length operand */
946
947 status = acpi_ds_obj_stack_pop(1, walk_state);
948 if (ACPI_FAILURE(status)) {
949 return_ACPI_STATUS(status);
950 }
951
952 acpi_ut_remove_reference(arg_desc);
953
954 /*
955 * Create the actual data object
956 */
957 switch (op->common.aml_opcode) {
958 case AML_BUFFER_OP:
959
960 status =
961 acpi_ds_build_internal_buffer_obj(walk_state, op, length,
962 &obj_desc);
963 break;
964
965 case AML_PACKAGE_OP:
966 case AML_VAR_PACKAGE_OP:
967
968 status =
969 acpi_ds_build_internal_package_obj(walk_state, op, length,
970 &obj_desc);
971 break;
972
973 default:
974 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
975 }
976
977 if (ACPI_SUCCESS(status)) {
978 /*
979 * Return the object in the walk_state, unless the parent is a package -
980 * in this case, the return object will be stored in the parse tree
981 * for the package.
982 */
983 if ((!op->common.parent) ||
984 ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
985 (op->common.parent->common.aml_opcode !=
986 AML_VAR_PACKAGE_OP)
987 && (op->common.parent->common.aml_opcode != AML_NAME_OP))) {
988 walk_state->result_obj = obj_desc;
989 }
990 }
991
992 return_ACPI_STATUS(status);
993 }
994
995 /*******************************************************************************
996 *
997 * FUNCTION: acpi_ds_eval_bank_field_operands
998 *
999 * PARAMETERS: walk_state - Current walk
1000 * Op - A valid bank_field Op object
1001 *
1002 * RETURN: Status
1003 *
1004 * DESCRIPTION: Get bank_field bank_value
1005 * Called from acpi_ds_exec_end_op during bank_field parse tree walk
1006 *
1007 ******************************************************************************/
1008
1009 acpi_status
1010 acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
1011 union acpi_parse_object *op)
1012 {
1013 acpi_status status;
1014 union acpi_operand_object *obj_desc;
1015 union acpi_operand_object *operand_desc;
1016 struct acpi_namespace_node *node;
1017 union acpi_parse_object *next_op;
1018 union acpi_parse_object *arg;
1019
1020 ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
1021
1022 /*
1023 * This is where we evaluate the bank_value field of the
1024 * bank_field declaration
1025 */
1026
1027 /* next_op points to the op that holds the Region */
1028
1029 next_op = op->common.value.arg;
1030
1031 /* next_op points to the op that holds the Bank Register */
1032
1033 next_op = next_op->common.next;
1034
1035 /* next_op points to the op that holds the Bank Value */
1036
1037 next_op = next_op->common.next;
1038
1039 /*
1040 * Set proper index into operand stack for acpi_ds_obj_stack_push
1041 * invoked inside acpi_ds_create_operand.
1042 *
1043 * We use walk_state->Operands[0] to store the evaluated bank_value
1044 */
1045 walk_state->operand_index = 0;
1046
1047 status = acpi_ds_create_operand(walk_state, next_op, 0);
1048 if (ACPI_FAILURE(status)) {
1049 return_ACPI_STATUS(status);
1050 }
1051
1052 status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
1053 if (ACPI_FAILURE(status)) {
1054 return_ACPI_STATUS(status);
1055 }
1056
1057 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
1058 acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
1059 /*
1060 * Get the bank_value operand and save it
1061 * (at Top of stack)
1062 */
1063 operand_desc = walk_state->operands[0];
1064
1065 /* Arg points to the start Bank Field */
1066
1067 arg = acpi_ps_get_arg(op, 4);
1068 while (arg) {
1069
1070 /* Ignore OFFSET and ACCESSAS terms here */
1071
1072 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
1073 node = arg->common.node;
1074
1075 obj_desc = acpi_ns_get_attached_object(node);
1076 if (!obj_desc) {
1077 return_ACPI_STATUS(AE_NOT_EXIST);
1078 }
1079
1080 obj_desc->bank_field.value =
1081 (u32) operand_desc->integer.value;
1082 }
1083
1084 /* Move to next field in the list */
1085
1086 arg = arg->common.next;
1087 }
1088
1089 acpi_ut_remove_reference(operand_desc);
1090 return_ACPI_STATUS(status);
1091 }
1092
1093 /*******************************************************************************
1094 *
1095 * FUNCTION: acpi_ds_exec_begin_control_op
1096 *
1097 * PARAMETERS: walk_list - The list that owns the walk stack
1098 * Op - The control Op
1099 *
1100 * RETURN: Status
1101 *
1102 * DESCRIPTION: Handles all control ops encountered during control method
1103 * execution.
1104 *
1105 ******************************************************************************/
1106
1107 acpi_status
1108 acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
1109 union acpi_parse_object *op)
1110 {
1111 acpi_status status = AE_OK;
1112 union acpi_generic_state *control_state;
1113
1114 ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
1115
1116 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
1117 op->common.aml_opcode, walk_state));
1118
1119 switch (op->common.aml_opcode) {
1120 case AML_WHILE_OP:
1121
1122 /*
1123 * If this is an additional iteration of a while loop, continue.
1124 * There is no need to allocate a new control state.
1125 */
1126 if (walk_state->control_state) {
1127 if (walk_state->control_state->control.aml_predicate_start
1128 == (walk_state->parser_state.aml - 1)) {
1129
1130 /* Reset the state to start-of-loop */
1131
1132 walk_state->control_state->common.state =
1133 ACPI_CONTROL_CONDITIONAL_EXECUTING;
1134 break;
1135 }
1136 }
1137
1138 /*lint -fallthrough */
1139
1140 case AML_IF_OP:
1141
1142 /*
1143 * IF/WHILE: Create a new control state to manage these
1144 * constructs. We need to manage these as a stack, in order
1145 * to handle nesting.
1146 */
1147 control_state = acpi_ut_create_control_state();
1148 if (!control_state) {
1149 status = AE_NO_MEMORY;
1150 break;
1151 }
1152 /*
1153 * Save a pointer to the predicate for multiple executions
1154 * of a loop
1155 */
1156 control_state->control.aml_predicate_start =
1157 walk_state->parser_state.aml - 1;
1158 control_state->control.package_end =
1159 walk_state->parser_state.pkg_end;
1160 control_state->control.opcode = op->common.aml_opcode;
1161
1162 /* Push the control state on this walk's control stack */
1163
1164 acpi_ut_push_generic_state(&walk_state->control_state,
1165 control_state);
1166 break;
1167
1168 case AML_ELSE_OP:
1169
1170 /* Predicate is in the state object */
1171 /* If predicate is true, the IF was executed, ignore ELSE part */
1172
1173 if (walk_state->last_predicate) {
1174 status = AE_CTRL_TRUE;
1175 }
1176
1177 break;
1178
1179 case AML_RETURN_OP:
1180
1181 break;
1182
1183 default:
1184 break;
1185 }
1186
1187 return (status);
1188 }
1189
1190 /*******************************************************************************
1191 *
1192 * FUNCTION: acpi_ds_exec_end_control_op
1193 *
1194 * PARAMETERS: walk_list - The list that owns the walk stack
1195 * Op - The control Op
1196 *
1197 * RETURN: Status
1198 *
1199 * DESCRIPTION: Handles all control ops encountered during control method
1200 * execution.
1201 *
1202 ******************************************************************************/
1203
1204 acpi_status
1205 acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
1206 union acpi_parse_object * op)
1207 {
1208 acpi_status status = AE_OK;
1209 union acpi_generic_state *control_state;
1210
1211 ACPI_FUNCTION_NAME(ds_exec_end_control_op);
1212
1213 switch (op->common.aml_opcode) {
1214 case AML_IF_OP:
1215
1216 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
1217
1218 /*
1219 * Save the result of the predicate in case there is an
1220 * ELSE to come
1221 */
1222 walk_state->last_predicate =
1223 (u8) walk_state->control_state->common.value;
1224
1225 /*
1226 * Pop the control state that was created at the start
1227 * of the IF and free it
1228 */
1229 control_state =
1230 acpi_ut_pop_generic_state(&walk_state->control_state);
1231 acpi_ut_delete_generic_state(control_state);
1232 break;
1233
1234 case AML_ELSE_OP:
1235
1236 break;
1237
1238 case AML_WHILE_OP:
1239
1240 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
1241
1242 control_state = walk_state->control_state;
1243 if (control_state->common.value) {
1244
1245 /* Predicate was true, the body of the loop was just executed */
1246
1247 /*
1248 * This loop counter mechanism allows the interpreter to escape
1249 * possibly infinite loops. This can occur in poorly written AML
1250 * when the hardware does not respond within a while loop and the
1251 * loop does not implement a timeout.
1252 */
1253 control_state->control.loop_count++;
1254 if (control_state->control.loop_count >
1255 ACPI_MAX_LOOP_ITERATIONS) {
1256 status = AE_AML_INFINITE_LOOP;
1257 break;
1258 }
1259
1260 /*
1261 * Go back and evaluate the predicate and maybe execute the loop
1262 * another time
1263 */
1264 status = AE_CTRL_PENDING;
1265 walk_state->aml_last_while =
1266 control_state->control.aml_predicate_start;
1267 break;
1268 }
1269
1270 /* Predicate was false, terminate this while loop */
1271
1272 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1273 "[WHILE_OP] termination! Op=%p\n", op));
1274
1275 /* Pop this control state and free it */
1276
1277 control_state =
1278 acpi_ut_pop_generic_state(&walk_state->control_state);
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 && ((walk_state->results->results.obj_desc[0])->
1345 common.type == ACPI_TYPE_LOCAL_REFERENCE)
1346 && ((walk_state->results->results.obj_desc[0])->
1347 reference.class != ACPI_REFCLASS_INDEX)) {
1348 status =
1349 acpi_ex_resolve_to_value(&walk_state->
1350 results->results.
1351 obj_desc[0],
1352 walk_state);
1353 if (ACPI_FAILURE(status)) {
1354 return (status);
1355 }
1356 }
1357
1358 walk_state->return_desc =
1359 walk_state->results->results.obj_desc[0];
1360 } else {
1361 /* No return operand */
1362
1363 if (walk_state->num_operands) {
1364 acpi_ut_remove_reference(walk_state->
1365 operands[0]);
1366 }
1367
1368 walk_state->operands[0] = NULL;
1369 walk_state->num_operands = 0;
1370 walk_state->return_desc = NULL;
1371 }
1372
1373 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1374 "Completed RETURN_OP State=%p, RetVal=%p\n",
1375 walk_state, walk_state->return_desc));
1376
1377 /* End the control method execution right now */
1378
1379 status = AE_CTRL_TERMINATE;
1380 break;
1381
1382 case AML_NOOP_OP:
1383
1384 /* Just do nothing! */
1385 break;
1386
1387 case AML_BREAK_POINT_OP:
1388
1389 /* Call up to the OS service layer to handle this */
1390
1391 status =
1392 acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
1393 "Executed AML Breakpoint opcode");
1394
1395 /* If and when it returns, all done. */
1396
1397 break;
1398
1399 case AML_BREAK_OP:
1400 case AML_CONTINUE_OP: /* ACPI 2.0 */
1401
1402 /* Pop and delete control states until we find a while */
1403
1404 while (walk_state->control_state &&
1405 (walk_state->control_state->control.opcode !=
1406 AML_WHILE_OP)) {
1407 control_state =
1408 acpi_ut_pop_generic_state(&walk_state->
1409 control_state);
1410 acpi_ut_delete_generic_state(control_state);
1411 }
1412
1413 /* No while found? */
1414
1415 if (!walk_state->control_state) {
1416 return (AE_AML_NO_WHILE);
1417 }
1418
1419 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
1420
1421 walk_state->aml_last_while =
1422 walk_state->control_state->control.package_end;
1423
1424 /* Return status depending on opcode */
1425
1426 if (op->common.aml_opcode == AML_BREAK_OP) {
1427 status = AE_CTRL_BREAK;
1428 } else {
1429 status = AE_CTRL_CONTINUE;
1430 }
1431 break;
1432
1433 default:
1434
1435 ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p",
1436 op->common.aml_opcode, op));
1437
1438 status = AE_AML_BAD_OPCODE;
1439 break;
1440 }
1441
1442 return (status);
1443 }
x86 "subsystem" repository