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Initial commit
[wrt350n-kernel.git] / drivers / acpi / dispatcher / dsopcode.c
blobf501e083aac78779c6f5a0f4f0012bc505f6d6b1
1 /******************************************************************************
2 *
3 * Module Name: dsopcode - Dispatcher Op Region support and handling of
4 * "control" opcodes
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2007, R. Byron Moore
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
53 #define _COMPONENT ACPI_DISPATCHER
54 ACPI_MODULE_NAME("dsopcode")
55
56 /* Local prototypes */
57 static acpi_status
58 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
59 struct acpi_namespace_node *scope_node,
60 u32 aml_length, u8 * aml_start);
61
62 static acpi_status
63 acpi_ds_init_buffer_field(u16 aml_opcode,
64 union acpi_operand_object *obj_desc,
65 union acpi_operand_object *buffer_desc,
66 union acpi_operand_object *offset_desc,
67 union acpi_operand_object *length_desc,
68 union acpi_operand_object *result_desc);
69
70 /*******************************************************************************
71 *
72 * FUNCTION: acpi_ds_execute_arguments
73 *
74 * PARAMETERS: Node - Object NS node
75 * scope_node - Parent NS node
76 * aml_length - Length of executable AML
77 * aml_start - Pointer to the AML
78 *
79 * RETURN: Status.
80 *
81 * DESCRIPTION: Late (deferred) execution of region or field arguments
82 *
83 ******************************************************************************/
84
85 static acpi_status
86 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
87 struct acpi_namespace_node *scope_node,
88 u32 aml_length, u8 * aml_start)
89 {
90 acpi_status status;
91 union acpi_parse_object *op;
92 struct acpi_walk_state *walk_state;
93
94 ACPI_FUNCTION_TRACE(ds_execute_arguments);
95
96 /*
97 * Allocate a new parser op to be the root of the parsed tree
98 */
99 op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
100 if (!op) {
101 return_ACPI_STATUS(AE_NO_MEMORY);
102 }
103
104 /* Save the Node for use in acpi_ps_parse_aml */
105
106 op->common.node = scope_node;
107
108 /* Create and initialize a new parser state */
109
110 walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
111 if (!walk_state) {
112 status = AE_NO_MEMORY;
113 goto cleanup;
114 }
115
116 status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
117 aml_length, NULL, ACPI_IMODE_LOAD_PASS1);
118 if (ACPI_FAILURE(status)) {
119 acpi_ds_delete_walk_state(walk_state);
120 goto cleanup;
121 }
122
123 /* Mark this parse as a deferred opcode */
124
125 walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP;
126 walk_state->deferred_node = node;
127
128 /* Pass1: Parse the entire declaration */
129
130 status = acpi_ps_parse_aml(walk_state);
131 if (ACPI_FAILURE(status)) {
132 goto cleanup;
133 }
134
135 /* Get and init the Op created above */
136
137 op->common.node = node;
138 acpi_ps_delete_parse_tree(op);
139
140 /* Evaluate the deferred arguments */
141
142 op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
143 if (!op) {
144 return_ACPI_STATUS(AE_NO_MEMORY);
145 }
146
147 op->common.node = scope_node;
148
149 /* Create and initialize a new parser state */
150
151 walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
152 if (!walk_state) {
153 status = AE_NO_MEMORY;
154 goto cleanup;
155 }
156
157 /* Execute the opcode and arguments */
158
159 status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
160 aml_length, NULL, ACPI_IMODE_EXECUTE);
161 if (ACPI_FAILURE(status)) {
162 acpi_ds_delete_walk_state(walk_state);
163 goto cleanup;
164 }
165
166 /* Mark this execution as a deferred opcode */
167
168 walk_state->deferred_node = node;
169 status = acpi_ps_parse_aml(walk_state);
170
171 cleanup:
172 acpi_ps_delete_parse_tree(op);
173 return_ACPI_STATUS(status);
174 }
175
176 /*******************************************************************************
177 *
178 * FUNCTION: acpi_ds_get_buffer_field_arguments
179 *
180 * PARAMETERS: obj_desc - A valid buffer_field object
181 *
182 * RETURN: Status.
183 *
184 * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late
185 * evaluation of these field attributes.
186 *
187 ******************************************************************************/
188
189 acpi_status
190 acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
191 {
192 union acpi_operand_object *extra_desc;
193 struct acpi_namespace_node *node;
194 acpi_status status;
195
196 ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_field_arguments, obj_desc);
197
198 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
199 return_ACPI_STATUS(AE_OK);
200 }
201
202 /* Get the AML pointer (method object) and buffer_field node */
203
204 extra_desc = acpi_ns_get_secondary_object(obj_desc);
205 node = obj_desc->buffer_field.node;
206
207 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
208 (ACPI_TYPE_BUFFER_FIELD, node, NULL));
209 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BufferField Arg Init\n",
210 acpi_ut_get_node_name(node)));
211
212 /* Execute the AML code for the term_arg arguments */
213
214 status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
215 extra_desc->extra.aml_length,
216 extra_desc->extra.aml_start);
217 return_ACPI_STATUS(status);
218 }
219
220 /*******************************************************************************
221 *
222 * FUNCTION: acpi_ds_get_buffer_arguments
223 *
224 * PARAMETERS: obj_desc - A valid Buffer object
225 *
226 * RETURN: Status.
227 *
228 * DESCRIPTION: Get Buffer length and initializer byte list. This implements
229 * the late evaluation of these attributes.
230 *
231 ******************************************************************************/
232
233 acpi_status acpi_ds_get_buffer_arguments(union acpi_operand_object *obj_desc)
234 {
235 struct acpi_namespace_node *node;
236 acpi_status status;
237
238 ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_arguments, obj_desc);
239
240 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
241 return_ACPI_STATUS(AE_OK);
242 }
243
244 /* Get the Buffer node */
245
246 node = obj_desc->buffer.node;
247 if (!node) {
248 ACPI_ERROR((AE_INFO,
249 "No pointer back to NS node in buffer obj %p",
250 obj_desc));
251 return_ACPI_STATUS(AE_AML_INTERNAL);
252 }
253
254 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n"));
255
256 /* Execute the AML code for the term_arg arguments */
257
258 status = acpi_ds_execute_arguments(node, node,
259 obj_desc->buffer.aml_length,
260 obj_desc->buffer.aml_start);
261 return_ACPI_STATUS(status);
262 }
263
264 /*******************************************************************************
265 *
266 * FUNCTION: acpi_ds_get_package_arguments
267 *
268 * PARAMETERS: obj_desc - A valid Package object
269 *
270 * RETURN: Status.
271 *
272 * DESCRIPTION: Get Package length and initializer byte list. This implements
273 * the late evaluation of these attributes.
274 *
275 ******************************************************************************/
276
277 acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc)
278 {
279 struct acpi_namespace_node *node;
280 acpi_status status;
281
282 ACPI_FUNCTION_TRACE_PTR(ds_get_package_arguments, obj_desc);
283
284 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
285 return_ACPI_STATUS(AE_OK);
286 }
287
288 /* Get the Package node */
289
290 node = obj_desc->package.node;
291 if (!node) {
292 ACPI_ERROR((AE_INFO,
293 "No pointer back to NS node in package %p",
294 obj_desc));
295 return_ACPI_STATUS(AE_AML_INTERNAL);
296 }
297
298 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n"));
299
300 /* Execute the AML code for the term_arg arguments */
301
302 status = acpi_ds_execute_arguments(node, node,
303 obj_desc->package.aml_length,
304 obj_desc->package.aml_start);
305 return_ACPI_STATUS(status);
306 }
307
308 /*****************************************************************************
309 *
310 * FUNCTION: acpi_ds_get_region_arguments
311 *
312 * PARAMETERS: obj_desc - A valid region object
313 *
314 * RETURN: Status.
315 *
316 * DESCRIPTION: Get region address and length. This implements the late
317 * evaluation of these region attributes.
318 *
319 ****************************************************************************/
320
321 acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
322 {
323 struct acpi_namespace_node *node;
324 acpi_status status;
325 union acpi_operand_object *extra_desc;
326
327 ACPI_FUNCTION_TRACE_PTR(ds_get_region_arguments, obj_desc);
328
329 if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
330 return_ACPI_STATUS(AE_OK);
331 }
332
333 extra_desc = acpi_ns_get_secondary_object(obj_desc);
334 if (!extra_desc) {
335 return_ACPI_STATUS(AE_NOT_EXIST);
336 }
337
338 /* Get the Region node */
339
340 node = obj_desc->region.node;
341
342 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
343 (ACPI_TYPE_REGION, node, NULL));
344
345 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] OpRegion Arg Init at AML %p\n",
346 acpi_ut_get_node_name(node),
347 extra_desc->extra.aml_start));
348
349 /* Execute the argument AML */
350
351 status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
352 extra_desc->extra.aml_length,
353 extra_desc->extra.aml_start);
354 if (ACPI_FAILURE(status)) {
355 return_ACPI_STATUS(status);
356 }
357
358 /* Validate the region address/length via the host OS */
359
360 status = acpi_os_validate_address(obj_desc->region.space_id,
361 obj_desc->region.address,
362 (acpi_size) obj_desc->region.length,
363 acpi_ut_get_node_name(node));
364
365 if (ACPI_FAILURE(status)) {
366 /*
367 * Invalid address/length. We will emit an error message and mark
368 * the region as invalid, so that it will cause an additional error if
369 * it is ever used. Then return AE_OK.
370 */
371 ACPI_EXCEPTION((AE_INFO, status,
372 "During address validation of OpRegion [%4.4s]",
373 node->name.ascii));
374 obj_desc->common.flags |= AOPOBJ_INVALID;
375 status = AE_OK;
376 }
377
378 return_ACPI_STATUS(status);
379 }
380
381 /*******************************************************************************
382 *
383 * FUNCTION: acpi_ds_initialize_region
384 *
385 * PARAMETERS: obj_handle - Region namespace node
386 *
387 * RETURN: Status
388 *
389 * DESCRIPTION: Front end to ev_initialize_region
390 *
391 ******************************************************************************/
392
393 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
394 {
395 union acpi_operand_object *obj_desc;
396 acpi_status status;
397
398 obj_desc = acpi_ns_get_attached_object(obj_handle);
399
400 /* Namespace is NOT locked */
401
402 status = acpi_ev_initialize_region(obj_desc, FALSE);
403 return (status);
404 }
405
406 /*******************************************************************************
407 *
408 * FUNCTION: acpi_ds_init_buffer_field
409 *
410 * PARAMETERS: aml_opcode - create_xxx_field
411 * obj_desc - buffer_field object
412 * buffer_desc - Host Buffer
413 * offset_desc - Offset into buffer
414 * length_desc - Length of field (CREATE_FIELD_OP only)
415 * result_desc - Where to store the result
416 *
417 * RETURN: Status
418 *
419 * DESCRIPTION: Perform actual initialization of a buffer field
420 *
421 ******************************************************************************/
422
423 static acpi_status
424 acpi_ds_init_buffer_field(u16 aml_opcode,
425 union acpi_operand_object *obj_desc,
426 union acpi_operand_object *buffer_desc,
427 union acpi_operand_object *offset_desc,
428 union acpi_operand_object *length_desc,
429 union acpi_operand_object *result_desc)
430 {
431 u32 offset;
432 u32 bit_offset;
433 u32 bit_count;
434 u8 field_flags;
435 acpi_status status;
436
437 ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
438
439 /* Host object must be a Buffer */
440
441 if (ACPI_GET_OBJECT_TYPE(buffer_desc) != ACPI_TYPE_BUFFER) {
442 ACPI_ERROR((AE_INFO,
443 "Target of Create Field is not a Buffer object - %s",
444 acpi_ut_get_object_type_name(buffer_desc)));
445
446 status = AE_AML_OPERAND_TYPE;
447 goto cleanup;
448 }
449
450 /*
451 * The last parameter to all of these opcodes (result_desc) started
452 * out as a name_string, and should therefore now be a NS node
453 * after resolution in acpi_ex_resolve_operands().
454 */
455 if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
456 ACPI_ERROR((AE_INFO,
457 "(%s) destination not a NS Node [%s]",
458 acpi_ps_get_opcode_name(aml_opcode),
459 acpi_ut_get_descriptor_name(result_desc)));
460
461 status = AE_AML_OPERAND_TYPE;
462 goto cleanup;
463 }
464
465 offset = (u32) offset_desc->integer.value;
466
467 /*
468 * Setup the Bit offsets and counts, according to the opcode
469 */
470 switch (aml_opcode) {
471 case AML_CREATE_FIELD_OP:
472
473 /* Offset is in bits, count is in bits */
474
475 field_flags = AML_FIELD_ACCESS_BYTE;
476 bit_offset = offset;
477 bit_count = (u32) length_desc->integer.value;
478
479 /* Must have a valid (>0) bit count */
480
481 if (bit_count == 0) {
482 ACPI_ERROR((AE_INFO,
483 "Attempt to CreateField of length zero"));
484 status = AE_AML_OPERAND_VALUE;
485 goto cleanup;
486 }
487 break;
488
489 case AML_CREATE_BIT_FIELD_OP:
490
491 /* Offset is in bits, Field is one bit */
492
493 bit_offset = offset;
494 bit_count = 1;
495 field_flags = AML_FIELD_ACCESS_BYTE;
496 break;
497
498 case AML_CREATE_BYTE_FIELD_OP:
499
500 /* Offset is in bytes, field is one byte */
501
502 bit_offset = 8 * offset;
503 bit_count = 8;
504 field_flags = AML_FIELD_ACCESS_BYTE;
505 break;
506
507 case AML_CREATE_WORD_FIELD_OP:
508
509 /* Offset is in bytes, field is one word */
510
511 bit_offset = 8 * offset;
512 bit_count = 16;
513 field_flags = AML_FIELD_ACCESS_WORD;
514 break;
515
516 case AML_CREATE_DWORD_FIELD_OP:
517
518 /* Offset is in bytes, field is one dword */
519
520 bit_offset = 8 * offset;
521 bit_count = 32;
522 field_flags = AML_FIELD_ACCESS_DWORD;
523 break;
524
525 case AML_CREATE_QWORD_FIELD_OP:
526
527 /* Offset is in bytes, field is one qword */
528
529 bit_offset = 8 * offset;
530 bit_count = 64;
531 field_flags = AML_FIELD_ACCESS_QWORD;
532 break;
533
534 default:
535
536 ACPI_ERROR((AE_INFO,
537 "Unknown field creation opcode %02x", aml_opcode));
538 status = AE_AML_BAD_OPCODE;
539 goto cleanup;
540 }
541
542 /* Entire field must fit within the current length of the buffer */
543
544 if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
545 ACPI_ERROR((AE_INFO,
546 "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)",
547 acpi_ut_get_node_name(result_desc),
548 bit_offset + bit_count,
549 acpi_ut_get_node_name(buffer_desc->buffer.node),
550 8 * (u32) buffer_desc->buffer.length));
551 status = AE_AML_BUFFER_LIMIT;
552 goto cleanup;
553 }
554
555 /*
556 * Initialize areas of the field object that are common to all fields
557 * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
558 * UPDATE_RULE = 0 (UPDATE_PRESERVE)
559 */
560 status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
561 bit_offset, bit_count);
562 if (ACPI_FAILURE(status)) {
563 goto cleanup;
564 }
565
566 obj_desc->buffer_field.buffer_obj = buffer_desc;
567
568 /* Reference count for buffer_desc inherits obj_desc count */
569
570 buffer_desc->common.reference_count = (u16)
571 (buffer_desc->common.reference_count +
572 obj_desc->common.reference_count);
573
574 cleanup:
575
576 /* Always delete the operands */
577
578 acpi_ut_remove_reference(offset_desc);
579 acpi_ut_remove_reference(buffer_desc);
580
581 if (aml_opcode == AML_CREATE_FIELD_OP) {
582 acpi_ut_remove_reference(length_desc);
583 }
584
585 /* On failure, delete the result descriptor */
586
587 if (ACPI_FAILURE(status)) {
588 acpi_ut_remove_reference(result_desc); /* Result descriptor */
589 } else {
590 /* Now the address and length are valid for this buffer_field */
591
592 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
593 }
594
595 return_ACPI_STATUS(status);
596 }
597
598 /*******************************************************************************
599 *
600 * FUNCTION: acpi_ds_eval_buffer_field_operands
601 *
602 * PARAMETERS: walk_state - Current walk
603 * Op - A valid buffer_field Op object
604 *
605 * RETURN: Status
606 *
607 * DESCRIPTION: Get buffer_field Buffer and Index
608 * Called from acpi_ds_exec_end_op during buffer_field parse tree walk
609 *
610 ******************************************************************************/
611
612 acpi_status
613 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
614 union acpi_parse_object *op)
615 {
616 acpi_status status;
617 union acpi_operand_object *obj_desc;
618 struct acpi_namespace_node *node;
619 union acpi_parse_object *next_op;
620
621 ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
622
623 /*
624 * This is where we evaluate the address and length fields of the
625 * create_xxx_field declaration
626 */
627 node = op->common.node;
628
629 /* next_op points to the op that holds the Buffer */
630
631 next_op = op->common.value.arg;
632
633 /* Evaluate/create the address and length operands */
634
635 status = acpi_ds_create_operands(walk_state, next_op);
636 if (ACPI_FAILURE(status)) {
637 return_ACPI_STATUS(status);
638 }
639
640 obj_desc = acpi_ns_get_attached_object(node);
641 if (!obj_desc) {
642 return_ACPI_STATUS(AE_NOT_EXIST);
643 }
644
645 /* Resolve the operands */
646
647 status = acpi_ex_resolve_operands(op->common.aml_opcode,
648 ACPI_WALK_OPERANDS, walk_state);
649
650 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
651 acpi_ps_get_opcode_name(op->common.aml_opcode),
652 walk_state->num_operands,
653 "after AcpiExResolveOperands");
654
655 if (ACPI_FAILURE(status)) {
656 ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)",
657 acpi_ps_get_opcode_name(op->common.aml_opcode),
658 status));
659
660 return_ACPI_STATUS(status);
661 }
662
663 /* Initialize the Buffer Field */
664
665 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
666
667 /* NOTE: Slightly different operands for this opcode */
668
669 status =
670 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
671 walk_state->operands[0],
672 walk_state->operands[1],
673 walk_state->operands[2],
674 walk_state->operands[3]);
675 } else {
676 /* All other, create_xxx_field opcodes */
677
678 status =
679 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
680 walk_state->operands[0],
681 walk_state->operands[1], NULL,
682 walk_state->operands[2]);
683 }
684
685 return_ACPI_STATUS(status);
686 }
687
688 /*******************************************************************************
689 *
690 * FUNCTION: acpi_ds_eval_region_operands
691 *
692 * PARAMETERS: walk_state - Current walk
693 * Op - A valid region Op object
694 *
695 * RETURN: Status
696 *
697 * DESCRIPTION: Get region address and length
698 * Called from acpi_ds_exec_end_op during op_region parse tree walk
699 *
700 ******************************************************************************/
701
702 acpi_status
703 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
704 union acpi_parse_object *op)
705 {
706 acpi_status status;
707 union acpi_operand_object *obj_desc;
708 union acpi_operand_object *operand_desc;
709 struct acpi_namespace_node *node;
710 union acpi_parse_object *next_op;
711
712 ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
713
714 /*
715 * This is where we evaluate the address and length fields of the
716 * op_region declaration
717 */
718 node = op->common.node;
719
720 /* next_op points to the op that holds the space_iD */
721
722 next_op = op->common.value.arg;
723
724 /* next_op points to address op */
725
726 next_op = next_op->common.next;
727
728 /* Evaluate/create the address and length operands */
729
730 status = acpi_ds_create_operands(walk_state, next_op);
731 if (ACPI_FAILURE(status)) {
732 return_ACPI_STATUS(status);
733 }
734
735 /* Resolve the length and address operands to numbers */
736
737 status = acpi_ex_resolve_operands(op->common.aml_opcode,
738 ACPI_WALK_OPERANDS, walk_state);
739 if (ACPI_FAILURE(status)) {
740 return_ACPI_STATUS(status);
741 }
742
743 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
744 acpi_ps_get_opcode_name(op->common.aml_opcode),
745 1, "after AcpiExResolveOperands");
746
747 obj_desc = acpi_ns_get_attached_object(node);
748 if (!obj_desc) {
749 return_ACPI_STATUS(AE_NOT_EXIST);
750 }
751
752 /*
753 * Get the length operand and save it
754 * (at Top of stack)
755 */
756 operand_desc = walk_state->operands[walk_state->num_operands - 1];
757
758 obj_desc->region.length = (u32) operand_desc->integer.value;
759 acpi_ut_remove_reference(operand_desc);
760
761 /*
762 * Get the address and save it
763 * (at top of stack - 1)
764 */
765 operand_desc = walk_state->operands[walk_state->num_operands - 2];
766
767 obj_desc->region.address = (acpi_physical_address)
768 operand_desc->integer.value;
769 acpi_ut_remove_reference(operand_desc);
770
771 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
772 obj_desc,
773 ACPI_FORMAT_UINT64(obj_desc->region.address),
774 obj_desc->region.length));
775
776 /* Now the address and length are valid for this opregion */
777
778 obj_desc->region.flags |= AOPOBJ_DATA_VALID;
779
780 return_ACPI_STATUS(status);
781 }
782
783 /*******************************************************************************
784 *
785 * FUNCTION: acpi_ds_eval_data_object_operands
786 *
787 * PARAMETERS: walk_state - Current walk
788 * Op - A valid data_object Op object
789 * obj_desc - data_object
790 *
791 * RETURN: Status
792 *
793 * DESCRIPTION: Get the operands and complete the following data object types:
794 * Buffer, Package.
795 *
796 ******************************************************************************/
797
798 acpi_status
799 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
800 union acpi_parse_object *op,
801 union acpi_operand_object *obj_desc)
802 {
803 acpi_status status;
804 union acpi_operand_object *arg_desc;
805 u32 length;
806
807 ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
808
809 /* The first operand (for all of these data objects) is the length */
810
811 status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
812 if (ACPI_FAILURE(status)) {
813 return_ACPI_STATUS(status);
814 }
815
816 status = acpi_ex_resolve_operands(walk_state->opcode,
817 &(walk_state->
818 operands[walk_state->num_operands -
819 1]), walk_state);
820 if (ACPI_FAILURE(status)) {
821 return_ACPI_STATUS(status);
822 }
823
824 /* Extract length operand */
825
826 arg_desc = walk_state->operands[walk_state->num_operands - 1];
827 length = (u32) arg_desc->integer.value;
828
829 /* Cleanup for length operand */
830
831 status = acpi_ds_obj_stack_pop(1, walk_state);
832 if (ACPI_FAILURE(status)) {
833 return_ACPI_STATUS(status);
834 }
835
836 acpi_ut_remove_reference(arg_desc);
837
838 /*
839 * Create the actual data object
840 */
841 switch (op->common.aml_opcode) {
842 case AML_BUFFER_OP:
843
844 status =
845 acpi_ds_build_internal_buffer_obj(walk_state, op, length,
846 &obj_desc);
847 break;
848
849 case AML_PACKAGE_OP:
850 case AML_VAR_PACKAGE_OP:
851
852 status =
853 acpi_ds_build_internal_package_obj(walk_state, op, length,
854 &obj_desc);
855 break;
856
857 default:
858 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
859 }
860
861 if (ACPI_SUCCESS(status)) {
862 /*
863 * Return the object in the walk_state, unless the parent is a package -
864 * in this case, the return object will be stored in the parse tree
865 * for the package.
866 */
867 if ((!op->common.parent) ||
868 ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
869 (op->common.parent->common.aml_opcode !=
870 AML_VAR_PACKAGE_OP)
871 && (op->common.parent->common.aml_opcode != AML_NAME_OP))) {
872 walk_state->result_obj = obj_desc;
873 }
874 }
875
876 return_ACPI_STATUS(status);
877 }
878
879 /*******************************************************************************
880 *
881 * FUNCTION: acpi_ds_exec_begin_control_op
882 *
883 * PARAMETERS: walk_list - The list that owns the walk stack
884 * Op - The control Op
885 *
886 * RETURN: Status
887 *
888 * DESCRIPTION: Handles all control ops encountered during control method
889 * execution.
890 *
891 ******************************************************************************/
892
893 acpi_status
894 acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
895 union acpi_parse_object *op)
896 {
897 acpi_status status = AE_OK;
898 union acpi_generic_state *control_state;
899
900 ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
901
902 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
903 op->common.aml_opcode, walk_state));
904
905 switch (op->common.aml_opcode) {
906 case AML_IF_OP:
907 case AML_WHILE_OP:
908
909 /*
910 * IF/WHILE: Create a new control state to manage these
911 * constructs. We need to manage these as a stack, in order
912 * to handle nesting.
913 */
914 control_state = acpi_ut_create_control_state();
915 if (!control_state) {
916 status = AE_NO_MEMORY;
917 break;
918 }
919 /*
920 * Save a pointer to the predicate for multiple executions
921 * of a loop
922 */
923 control_state->control.aml_predicate_start =
924 walk_state->parser_state.aml - 1;
925 control_state->control.package_end =
926 walk_state->parser_state.pkg_end;
927 control_state->control.opcode = op->common.aml_opcode;
928
929 /* Push the control state on this walk's control stack */
930
931 acpi_ut_push_generic_state(&walk_state->control_state,
932 control_state);
933 break;
934
935 case AML_ELSE_OP:
936
937 /* Predicate is in the state object */
938 /* If predicate is true, the IF was executed, ignore ELSE part */
939
940 if (walk_state->last_predicate) {
941 status = AE_CTRL_TRUE;
942 }
943
944 break;
945
946 case AML_RETURN_OP:
947
948 break;
949
950 default:
951 break;
952 }
953
954 return (status);
955 }
956
957 /*******************************************************************************
958 *
959 * FUNCTION: acpi_ds_exec_end_control_op
960 *
961 * PARAMETERS: walk_list - The list that owns the walk stack
962 * Op - The control Op
963 *
964 * RETURN: Status
965 *
966 * DESCRIPTION: Handles all control ops encountered during control method
967 * execution.
968 *
969 ******************************************************************************/
970
971 acpi_status
972 acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
973 union acpi_parse_object * op)
974 {
975 acpi_status status = AE_OK;
976 union acpi_generic_state *control_state;
977
978 ACPI_FUNCTION_NAME(ds_exec_end_control_op);
979
980 switch (op->common.aml_opcode) {
981 case AML_IF_OP:
982
983 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
984
985 /*
986 * Save the result of the predicate in case there is an
987 * ELSE to come
988 */
989 walk_state->last_predicate =
990 (u8) walk_state->control_state->common.value;
991
992 /*
993 * Pop the control state that was created at the start
994 * of the IF and free it
995 */
996 control_state =
997 acpi_ut_pop_generic_state(&walk_state->control_state);
998 acpi_ut_delete_generic_state(control_state);
999 break;
1000
1001 case AML_ELSE_OP:
1002
1003 break;
1004
1005 case AML_WHILE_OP:
1006
1007 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
1008
1009 if (walk_state->control_state->common.value) {
1010
1011 /* Predicate was true, go back and evaluate it again! */
1012
1013 status = AE_CTRL_PENDING;
1014 }
1015
1016 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1017 "[WHILE_OP] termination! Op=%p\n", op));
1018
1019 /* Pop this control state and free it */
1020
1021 control_state =
1022 acpi_ut_pop_generic_state(&walk_state->control_state);
1023
1024 walk_state->aml_last_while =
1025 control_state->control.aml_predicate_start;
1026 acpi_ut_delete_generic_state(control_state);
1027 break;
1028
1029 case AML_RETURN_OP:
1030
1031 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1032 "[RETURN_OP] Op=%p Arg=%p\n", op,
1033 op->common.value.arg));
1034
1035 /*
1036 * One optional operand -- the return value
1037 * It can be either an immediate operand or a result that
1038 * has been bubbled up the tree
1039 */
1040 if (op->common.value.arg) {
1041
1042 /* Since we have a real Return(), delete any implicit return */
1043
1044 acpi_ds_clear_implicit_return(walk_state);
1045
1046 /* Return statement has an immediate operand */
1047
1048 status =
1049 acpi_ds_create_operands(walk_state,
1050 op->common.value.arg);
1051 if (ACPI_FAILURE(status)) {
1052 return (status);
1053 }
1054
1055 /*
1056 * If value being returned is a Reference (such as
1057 * an arg or local), resolve it now because it may
1058 * cease to exist at the end of the method.
1059 */
1060 status =
1061 acpi_ex_resolve_to_value(&walk_state->operands[0],
1062 walk_state);
1063 if (ACPI_FAILURE(status)) {
1064 return (status);
1065 }
1066
1067 /*
1068 * Get the return value and save as the last result
1069 * value. This is the only place where walk_state->return_desc
1070 * is set to anything other than zero!
1071 */
1072 walk_state->return_desc = walk_state->operands[0];
1073 } else if ((walk_state->results) &&
1074 (walk_state->results->results.num_results > 0)) {
1075
1076 /* Since we have a real Return(), delete any implicit return */
1077
1078 acpi_ds_clear_implicit_return(walk_state);
1079
1080 /*
1081 * The return value has come from a previous calculation.
1082 *
1083 * If value being returned is a Reference (such as
1084 * an arg or local), resolve it now because it may
1085 * cease to exist at the end of the method.
1086 *
1087 * Allow references created by the Index operator to return unchanged.
1088 */
1089 if ((ACPI_GET_DESCRIPTOR_TYPE
1090 (walk_state->results->results.obj_desc[0]) ==
1091 ACPI_DESC_TYPE_OPERAND)
1092 &&
1093 (ACPI_GET_OBJECT_TYPE
1094 (walk_state->results->results.obj_desc[0]) ==
1095 ACPI_TYPE_LOCAL_REFERENCE)
1096 && ((walk_state->results->results.obj_desc[0])->
1097 reference.opcode != AML_INDEX_OP)) {
1098 status =
1099 acpi_ex_resolve_to_value(&walk_state->
1100 results->results.
1101 obj_desc[0],
1102 walk_state);
1103 if (ACPI_FAILURE(status)) {
1104 return (status);
1105 }
1106 }
1107
1108 walk_state->return_desc =
1109 walk_state->results->results.obj_desc[0];
1110 } else {
1111 /* No return operand */
1112
1113 if (walk_state->num_operands) {
1114 acpi_ut_remove_reference(walk_state->
1115 operands[0]);
1116 }
1117
1118 walk_state->operands[0] = NULL;
1119 walk_state->num_operands = 0;
1120 walk_state->return_desc = NULL;
1121 }
1122
1123 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1124 "Completed RETURN_OP State=%p, RetVal=%p\n",
1125 walk_state, walk_state->return_desc));
1126
1127 /* End the control method execution right now */
1128
1129 status = AE_CTRL_TERMINATE;
1130 break;
1131
1132 case AML_NOOP_OP:
1133
1134 /* Just do nothing! */
1135 break;
1136
1137 case AML_BREAK_POINT_OP:
1138
1139 /* Call up to the OS service layer to handle this */
1140
1141 status =
1142 acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
1143 "Executed AML Breakpoint opcode");
1144
1145 /* If and when it returns, all done. */
1146
1147 break;
1148
1149 case AML_BREAK_OP:
1150 case AML_CONTINUE_OP: /* ACPI 2.0 */
1151
1152 /* Pop and delete control states until we find a while */
1153
1154 while (walk_state->control_state &&
1155 (walk_state->control_state->control.opcode !=
1156 AML_WHILE_OP)) {
1157 control_state =
1158 acpi_ut_pop_generic_state(&walk_state->
1159 control_state);
1160 acpi_ut_delete_generic_state(control_state);
1161 }
1162
1163 /* No while found? */
1164
1165 if (!walk_state->control_state) {
1166 return (AE_AML_NO_WHILE);
1167 }
1168
1169 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
1170
1171 walk_state->aml_last_while =
1172 walk_state->control_state->control.package_end;
1173
1174 /* Return status depending on opcode */
1175
1176 if (op->common.aml_opcode == AML_BREAK_OP) {
1177 status = AE_CTRL_BREAK;
1178 } else {
1179 status = AE_CTRL_CONTINUE;
1180 }
1181 break;
1182
1183 default:
1184
1185 ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p",
1186 op->common.aml_opcode, op));
1187
1188 status = AE_AML_BAD_OPCODE;
1189 break;
1190 }
1191
1192 return (status);
1193 }
WRT350N Kernel Patches