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ACPI: Make _OSI(Linux) a special case
[pv_ops_mirror.git] / drivers / acpi / dispatcher / dsopcode.c
blobfc9da4879cbfb932e3b2e8ea683b12835d2391ad
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 if (ACPI_FAILURE(status)) {
364 /*
365 * Invalid address/length. We will emit an error message and mark
366 * the region as invalid, so that it will cause an additional error if
367 * it is ever used. Then return AE_OK.
368 */
369 ACPI_EXCEPTION((AE_INFO, status,
370 "During address validation of OpRegion [%4.4s]",
371 node->name.ascii));
372 obj_desc->common.flags |= AOPOBJ_INVALID;
373 status = AE_OK;
374 }
375
376 return_ACPI_STATUS(status);
377 }
378
379 /*******************************************************************************
380 *
381 * FUNCTION: acpi_ds_initialize_region
382 *
383 * PARAMETERS: obj_handle - Region namespace node
384 *
385 * RETURN: Status
386 *
387 * DESCRIPTION: Front end to ev_initialize_region
388 *
389 ******************************************************************************/
390
391 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
392 {
393 union acpi_operand_object *obj_desc;
394 acpi_status status;
395
396 obj_desc = acpi_ns_get_attached_object(obj_handle);
397
398 /* Namespace is NOT locked */
399
400 status = acpi_ev_initialize_region(obj_desc, FALSE);
401 return (status);
402 }
403
404 /*******************************************************************************
405 *
406 * FUNCTION: acpi_ds_init_buffer_field
407 *
408 * PARAMETERS: aml_opcode - create_xxx_field
409 * obj_desc - buffer_field object
410 * buffer_desc - Host Buffer
411 * offset_desc - Offset into buffer
412 * length_desc - Length of field (CREATE_FIELD_OP only)
413 * result_desc - Where to store the result
414 *
415 * RETURN: Status
416 *
417 * DESCRIPTION: Perform actual initialization of a buffer field
418 *
419 ******************************************************************************/
420
421 static acpi_status
422 acpi_ds_init_buffer_field(u16 aml_opcode,
423 union acpi_operand_object *obj_desc,
424 union acpi_operand_object *buffer_desc,
425 union acpi_operand_object *offset_desc,
426 union acpi_operand_object *length_desc,
427 union acpi_operand_object *result_desc)
428 {
429 u32 offset;
430 u32 bit_offset;
431 u32 bit_count;
432 u8 field_flags;
433 acpi_status status;
434
435 ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
436
437 /* Host object must be a Buffer */
438
439 if (ACPI_GET_OBJECT_TYPE(buffer_desc) != ACPI_TYPE_BUFFER) {
440 ACPI_ERROR((AE_INFO,
441 "Target of Create Field is not a Buffer object - %s",
442 acpi_ut_get_object_type_name(buffer_desc)));
443
444 status = AE_AML_OPERAND_TYPE;
445 goto cleanup;
446 }
447
448 /*
449 * The last parameter to all of these opcodes (result_desc) started
450 * out as a name_string, and should therefore now be a NS node
451 * after resolution in acpi_ex_resolve_operands().
452 */
453 if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
454 ACPI_ERROR((AE_INFO,
455 "(%s) destination not a NS Node [%s]",
456 acpi_ps_get_opcode_name(aml_opcode),
457 acpi_ut_get_descriptor_name(result_desc)));
458
459 status = AE_AML_OPERAND_TYPE;
460 goto cleanup;
461 }
462
463 offset = (u32) offset_desc->integer.value;
464
465 /*
466 * Setup the Bit offsets and counts, according to the opcode
467 */
468 switch (aml_opcode) {
469 case AML_CREATE_FIELD_OP:
470
471 /* Offset is in bits, count is in bits */
472
473 field_flags = AML_FIELD_ACCESS_BYTE;
474 bit_offset = offset;
475 bit_count = (u32) length_desc->integer.value;
476
477 /* Must have a valid (>0) bit count */
478
479 if (bit_count == 0) {
480 ACPI_ERROR((AE_INFO,
481 "Attempt to CreateField of length zero"));
482 status = AE_AML_OPERAND_VALUE;
483 goto cleanup;
484 }
485 break;
486
487 case AML_CREATE_BIT_FIELD_OP:
488
489 /* Offset is in bits, Field is one bit */
490
491 bit_offset = offset;
492 bit_count = 1;
493 field_flags = AML_FIELD_ACCESS_BYTE;
494 break;
495
496 case AML_CREATE_BYTE_FIELD_OP:
497
498 /* Offset is in bytes, field is one byte */
499
500 bit_offset = 8 * offset;
501 bit_count = 8;
502 field_flags = AML_FIELD_ACCESS_BYTE;
503 break;
504
505 case AML_CREATE_WORD_FIELD_OP:
506
507 /* Offset is in bytes, field is one word */
508
509 bit_offset = 8 * offset;
510 bit_count = 16;
511 field_flags = AML_FIELD_ACCESS_WORD;
512 break;
513
514 case AML_CREATE_DWORD_FIELD_OP:
515
516 /* Offset is in bytes, field is one dword */
517
518 bit_offset = 8 * offset;
519 bit_count = 32;
520 field_flags = AML_FIELD_ACCESS_DWORD;
521 break;
522
523 case AML_CREATE_QWORD_FIELD_OP:
524
525 /* Offset is in bytes, field is one qword */
526
527 bit_offset = 8 * offset;
528 bit_count = 64;
529 field_flags = AML_FIELD_ACCESS_QWORD;
530 break;
531
532 default:
533
534 ACPI_ERROR((AE_INFO,
535 "Unknown field creation opcode %02x", aml_opcode));
536 status = AE_AML_BAD_OPCODE;
537 goto cleanup;
538 }
539
540 /* Entire field must fit within the current length of the buffer */
541
542 if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
543 ACPI_ERROR((AE_INFO,
544 "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)",
545 acpi_ut_get_node_name(result_desc),
546 bit_offset + bit_count,
547 acpi_ut_get_node_name(buffer_desc->buffer.node),
548 8 * (u32) buffer_desc->buffer.length));
549 status = AE_AML_BUFFER_LIMIT;
550 goto cleanup;
551 }
552
553 /*
554 * Initialize areas of the field object that are common to all fields
555 * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
556 * UPDATE_RULE = 0 (UPDATE_PRESERVE)
557 */
558 status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
559 bit_offset, bit_count);
560 if (ACPI_FAILURE(status)) {
561 goto cleanup;
562 }
563
564 obj_desc->buffer_field.buffer_obj = buffer_desc;
565
566 /* Reference count for buffer_desc inherits obj_desc count */
567
568 buffer_desc->common.reference_count = (u16)
569 (buffer_desc->common.reference_count +
570 obj_desc->common.reference_count);
571
572 cleanup:
573
574 /* Always delete the operands */
575
576 acpi_ut_remove_reference(offset_desc);
577 acpi_ut_remove_reference(buffer_desc);
578
579 if (aml_opcode == AML_CREATE_FIELD_OP) {
580 acpi_ut_remove_reference(length_desc);
581 }
582
583 /* On failure, delete the result descriptor */
584
585 if (ACPI_FAILURE(status)) {
586 acpi_ut_remove_reference(result_desc); /* Result descriptor */
587 } else {
588 /* Now the address and length are valid for this buffer_field */
589
590 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
591 }
592
593 return_ACPI_STATUS(status);
594 }
595
596 /*******************************************************************************
597 *
598 * FUNCTION: acpi_ds_eval_buffer_field_operands
599 *
600 * PARAMETERS: walk_state - Current walk
601 * Op - A valid buffer_field Op object
602 *
603 * RETURN: Status
604 *
605 * DESCRIPTION: Get buffer_field Buffer and Index
606 * Called from acpi_ds_exec_end_op during buffer_field parse tree walk
607 *
608 ******************************************************************************/
609
610 acpi_status
611 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
612 union acpi_parse_object *op)
613 {
614 acpi_status status;
615 union acpi_operand_object *obj_desc;
616 struct acpi_namespace_node *node;
617 union acpi_parse_object *next_op;
618
619 ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
620
621 /*
622 * This is where we evaluate the address and length fields of the
623 * create_xxx_field declaration
624 */
625 node = op->common.node;
626
627 /* next_op points to the op that holds the Buffer */
628
629 next_op = op->common.value.arg;
630
631 /* Evaluate/create the address and length operands */
632
633 status = acpi_ds_create_operands(walk_state, next_op);
634 if (ACPI_FAILURE(status)) {
635 return_ACPI_STATUS(status);
636 }
637
638 obj_desc = acpi_ns_get_attached_object(node);
639 if (!obj_desc) {
640 return_ACPI_STATUS(AE_NOT_EXIST);
641 }
642
643 /* Resolve the operands */
644
645 status = acpi_ex_resolve_operands(op->common.aml_opcode,
646 ACPI_WALK_OPERANDS, walk_state);
647
648 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
649 acpi_ps_get_opcode_name(op->common.aml_opcode),
650 walk_state->num_operands,
651 "after AcpiExResolveOperands");
652
653 if (ACPI_FAILURE(status)) {
654 ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)",
655 acpi_ps_get_opcode_name(op->common.aml_opcode),
656 status));
657
658 return_ACPI_STATUS(status);
659 }
660
661 /* Initialize the Buffer Field */
662
663 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
664
665 /* NOTE: Slightly different operands for this opcode */
666
667 status =
668 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
669 walk_state->operands[0],
670 walk_state->operands[1],
671 walk_state->operands[2],
672 walk_state->operands[3]);
673 } else {
674 /* All other, create_xxx_field opcodes */
675
676 status =
677 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
678 walk_state->operands[0],
679 walk_state->operands[1], NULL,
680 walk_state->operands[2]);
681 }
682
683 return_ACPI_STATUS(status);
684 }
685
686 /*******************************************************************************
687 *
688 * FUNCTION: acpi_ds_eval_region_operands
689 *
690 * PARAMETERS: walk_state - Current walk
691 * Op - A valid region Op object
692 *
693 * RETURN: Status
694 *
695 * DESCRIPTION: Get region address and length
696 * Called from acpi_ds_exec_end_op during op_region parse tree walk
697 *
698 ******************************************************************************/
699
700 acpi_status
701 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
702 union acpi_parse_object *op)
703 {
704 acpi_status status;
705 union acpi_operand_object *obj_desc;
706 union acpi_operand_object *operand_desc;
707 struct acpi_namespace_node *node;
708 union acpi_parse_object *next_op;
709
710 ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
711
712 /*
713 * This is where we evaluate the address and length fields of the
714 * op_region declaration
715 */
716 node = op->common.node;
717
718 /* next_op points to the op that holds the space_iD */
719
720 next_op = op->common.value.arg;
721
722 /* next_op points to address op */
723
724 next_op = next_op->common.next;
725
726 /* Evaluate/create the address and length operands */
727
728 status = acpi_ds_create_operands(walk_state, next_op);
729 if (ACPI_FAILURE(status)) {
730 return_ACPI_STATUS(status);
731 }
732
733 /* Resolve the length and address operands to numbers */
734
735 status = acpi_ex_resolve_operands(op->common.aml_opcode,
736 ACPI_WALK_OPERANDS, walk_state);
737 if (ACPI_FAILURE(status)) {
738 return_ACPI_STATUS(status);
739 }
740
741 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
742 acpi_ps_get_opcode_name(op->common.aml_opcode),
743 1, "after AcpiExResolveOperands");
744
745 obj_desc = acpi_ns_get_attached_object(node);
746 if (!obj_desc) {
747 return_ACPI_STATUS(AE_NOT_EXIST);
748 }
749
750 /*
751 * Get the length operand and save it
752 * (at Top of stack)
753 */
754 operand_desc = walk_state->operands[walk_state->num_operands - 1];
755
756 obj_desc->region.length = (u32) operand_desc->integer.value;
757 acpi_ut_remove_reference(operand_desc);
758
759 /*
760 * Get the address and save it
761 * (at top of stack - 1)
762 */
763 operand_desc = walk_state->operands[walk_state->num_operands - 2];
764
765 obj_desc->region.address = (acpi_physical_address)
766 operand_desc->integer.value;
767 acpi_ut_remove_reference(operand_desc);
768
769 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
770 obj_desc,
771 ACPI_FORMAT_UINT64(obj_desc->region.address),
772 obj_desc->region.length));
773
774 /* Now the address and length are valid for this opregion */
775
776 obj_desc->region.flags |= AOPOBJ_DATA_VALID;
777
778 return_ACPI_STATUS(status);
779 }
780
781 /*******************************************************************************
782 *
783 * FUNCTION: acpi_ds_eval_data_object_operands
784 *
785 * PARAMETERS: walk_state - Current walk
786 * Op - A valid data_object Op object
787 * obj_desc - data_object
788 *
789 * RETURN: Status
790 *
791 * DESCRIPTION: Get the operands and complete the following data object types:
792 * Buffer, Package.
793 *
794 ******************************************************************************/
795
796 acpi_status
797 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
798 union acpi_parse_object *op,
799 union acpi_operand_object *obj_desc)
800 {
801 acpi_status status;
802 union acpi_operand_object *arg_desc;
803 u32 length;
804
805 ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
806
807 /* The first operand (for all of these data objects) is the length */
808
809 status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
810 if (ACPI_FAILURE(status)) {
811 return_ACPI_STATUS(status);
812 }
813
814 status = acpi_ex_resolve_operands(walk_state->opcode,
815 &(walk_state->
816 operands[walk_state->num_operands -
817 1]), walk_state);
818 if (ACPI_FAILURE(status)) {
819 return_ACPI_STATUS(status);
820 }
821
822 /* Extract length operand */
823
824 arg_desc = walk_state->operands[walk_state->num_operands - 1];
825 length = (u32) arg_desc->integer.value;
826
827 /* Cleanup for length operand */
828
829 status = acpi_ds_obj_stack_pop(1, walk_state);
830 if (ACPI_FAILURE(status)) {
831 return_ACPI_STATUS(status);
832 }
833
834 acpi_ut_remove_reference(arg_desc);
835
836 /*
837 * Create the actual data object
838 */
839 switch (op->common.aml_opcode) {
840 case AML_BUFFER_OP:
841
842 status =
843 acpi_ds_build_internal_buffer_obj(walk_state, op, length,
844 &obj_desc);
845 break;
846
847 case AML_PACKAGE_OP:
848 case AML_VAR_PACKAGE_OP:
849
850 status =
851 acpi_ds_build_internal_package_obj(walk_state, op, length,
852 &obj_desc);
853 break;
854
855 default:
856 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
857 }
858
859 if (ACPI_SUCCESS(status)) {
860 /*
861 * Return the object in the walk_state, unless the parent is a package -
862 * in this case, the return object will be stored in the parse tree
863 * for the package.
864 */
865 if ((!op->common.parent) ||
866 ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
867 (op->common.parent->common.aml_opcode !=
868 AML_VAR_PACKAGE_OP)
869 && (op->common.parent->common.aml_opcode != AML_NAME_OP))) {
870 walk_state->result_obj = obj_desc;
871 }
872 }
873
874 return_ACPI_STATUS(status);
875 }
876
877 /*******************************************************************************
878 *
879 * FUNCTION: acpi_ds_exec_begin_control_op
880 *
881 * PARAMETERS: walk_list - The list that owns the walk stack
882 * Op - The control Op
883 *
884 * RETURN: Status
885 *
886 * DESCRIPTION: Handles all control ops encountered during control method
887 * execution.
888 *
889 ******************************************************************************/
890
891 acpi_status
892 acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
893 union acpi_parse_object *op)
894 {
895 acpi_status status = AE_OK;
896 union acpi_generic_state *control_state;
897
898 ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
899
900 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
901 op->common.aml_opcode, walk_state));
902
903 switch (op->common.aml_opcode) {
904 case AML_IF_OP:
905 case AML_WHILE_OP:
906
907 /*
908 * IF/WHILE: Create a new control state to manage these
909 * constructs. We need to manage these as a stack, in order
910 * to handle nesting.
911 */
912 control_state = acpi_ut_create_control_state();
913 if (!control_state) {
914 status = AE_NO_MEMORY;
915 break;
916 }
917 /*
918 * Save a pointer to the predicate for multiple executions
919 * of a loop
920 */
921 control_state->control.aml_predicate_start =
922 walk_state->parser_state.aml - 1;
923 control_state->control.package_end =
924 walk_state->parser_state.pkg_end;
925 control_state->control.opcode = op->common.aml_opcode;
926
927 /* Push the control state on this walk's control stack */
928
929 acpi_ut_push_generic_state(&walk_state->control_state,
930 control_state);
931 break;
932
933 case AML_ELSE_OP:
934
935 /* Predicate is in the state object */
936 /* If predicate is true, the IF was executed, ignore ELSE part */
937
938 if (walk_state->last_predicate) {
939 status = AE_CTRL_TRUE;
940 }
941
942 break;
943
944 case AML_RETURN_OP:
945
946 break;
947
948 default:
949 break;
950 }
951
952 return (status);
953 }
954
955 /*******************************************************************************
956 *
957 * FUNCTION: acpi_ds_exec_end_control_op
958 *
959 * PARAMETERS: walk_list - The list that owns the walk stack
960 * Op - The control Op
961 *
962 * RETURN: Status
963 *
964 * DESCRIPTION: Handles all control ops encountered during control method
965 * execution.
966 *
967 ******************************************************************************/
968
969 acpi_status
970 acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
971 union acpi_parse_object * op)
972 {
973 acpi_status status = AE_OK;
974 union acpi_generic_state *control_state;
975
976 ACPI_FUNCTION_NAME(ds_exec_end_control_op);
977
978 switch (op->common.aml_opcode) {
979 case AML_IF_OP:
980
981 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
982
983 /*
984 * Save the result of the predicate in case there is an
985 * ELSE to come
986 */
987 walk_state->last_predicate =
988 (u8) walk_state->control_state->common.value;
989
990 /*
991 * Pop the control state that was created at the start
992 * of the IF and free it
993 */
994 control_state =
995 acpi_ut_pop_generic_state(&walk_state->control_state);
996 acpi_ut_delete_generic_state(control_state);
997 break;
998
999 case AML_ELSE_OP:
1000
1001 break;
1002
1003 case AML_WHILE_OP:
1004
1005 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
1006
1007 if (walk_state->control_state->common.value) {
1008
1009 /* Predicate was true, go back and evaluate it again! */
1010
1011 status = AE_CTRL_PENDING;
1012 }
1013
1014 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1015 "[WHILE_OP] termination! Op=%p\n", op));
1016
1017 /* Pop this control state and free it */
1018
1019 control_state =
1020 acpi_ut_pop_generic_state(&walk_state->control_state);
1021
1022 walk_state->aml_last_while =
1023 control_state->control.aml_predicate_start;
1024 acpi_ut_delete_generic_state(control_state);
1025 break;
1026
1027 case AML_RETURN_OP:
1028
1029 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1030 "[RETURN_OP] Op=%p Arg=%p\n", op,
1031 op->common.value.arg));
1032
1033 /*
1034 * One optional operand -- the return value
1035 * It can be either an immediate operand or a result that
1036 * has been bubbled up the tree
1037 */
1038 if (op->common.value.arg) {
1039
1040 /* Since we have a real Return(), delete any implicit return */
1041
1042 acpi_ds_clear_implicit_return(walk_state);
1043
1044 /* Return statement has an immediate operand */
1045
1046 status =
1047 acpi_ds_create_operands(walk_state,
1048 op->common.value.arg);
1049 if (ACPI_FAILURE(status)) {
1050 return (status);
1051 }
1052
1053 /*
1054 * If value being returned is a Reference (such as
1055 * an arg or local), resolve it now because it may
1056 * cease to exist at the end of the method.
1057 */
1058 status =
1059 acpi_ex_resolve_to_value(&walk_state->operands[0],
1060 walk_state);
1061 if (ACPI_FAILURE(status)) {
1062 return (status);
1063 }
1064
1065 /*
1066 * Get the return value and save as the last result
1067 * value. This is the only place where walk_state->return_desc
1068 * is set to anything other than zero!
1069 */
1070 walk_state->return_desc = walk_state->operands[0];
1071 } else if ((walk_state->results) &&
1072 (walk_state->results->results.num_results > 0)) {
1073
1074 /* Since we have a real Return(), delete any implicit return */
1075
1076 acpi_ds_clear_implicit_return(walk_state);
1077
1078 /*
1079 * The return value has come from a previous calculation.
1080 *
1081 * If value being returned is a Reference (such as
1082 * an arg or local), resolve it now because it may
1083 * cease to exist at the end of the method.
1084 *
1085 * Allow references created by the Index operator to return unchanged.
1086 */
1087 if ((ACPI_GET_DESCRIPTOR_TYPE
1088 (walk_state->results->results.obj_desc[0]) ==
1089 ACPI_DESC_TYPE_OPERAND)
1090 &&
1091 (ACPI_GET_OBJECT_TYPE
1092 (walk_state->results->results.obj_desc[0]) ==
1093 ACPI_TYPE_LOCAL_REFERENCE)
1094 && ((walk_state->results->results.obj_desc[0])->
1095 reference.opcode != AML_INDEX_OP)) {
1096 status =
1097 acpi_ex_resolve_to_value(&walk_state->
1098 results->results.
1099 obj_desc[0],
1100 walk_state);
1101 if (ACPI_FAILURE(status)) {
1102 return (status);
1103 }
1104 }
1105
1106 walk_state->return_desc =
1107 walk_state->results->results.obj_desc[0];
1108 } else {
1109 /* No return operand */
1110
1111 if (walk_state->num_operands) {
1112 acpi_ut_remove_reference(walk_state->
1113 operands[0]);
1114 }
1115
1116 walk_state->operands[0] = NULL;
1117 walk_state->num_operands = 0;
1118 walk_state->return_desc = NULL;
1119 }
1120
1121 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1122 "Completed RETURN_OP State=%p, RetVal=%p\n",
1123 walk_state, walk_state->return_desc));
1124
1125 /* End the control method execution right now */
1126
1127 status = AE_CTRL_TERMINATE;
1128 break;
1129
1130 case AML_NOOP_OP:
1131
1132 /* Just do nothing! */
1133 break;
1134
1135 case AML_BREAK_POINT_OP:
1136
1137 /* Call up to the OS service layer to handle this */
1138
1139 status =
1140 acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
1141 "Executed AML Breakpoint opcode");
1142
1143 /* If and when it returns, all done. */
1144
1145 break;
1146
1147 case AML_BREAK_OP:
1148 case AML_CONTINUE_OP: /* ACPI 2.0 */
1149
1150 /* Pop and delete control states until we find a while */
1151
1152 while (walk_state->control_state &&
1153 (walk_state->control_state->control.opcode !=
1154 AML_WHILE_OP)) {
1155 control_state =
1156 acpi_ut_pop_generic_state(&walk_state->
1157 control_state);
1158 acpi_ut_delete_generic_state(control_state);
1159 }
1160
1161 /* No while found? */
1162
1163 if (!walk_state->control_state) {
1164 return (AE_AML_NO_WHILE);
1165 }
1166
1167 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
1168
1169 walk_state->aml_last_while =
1170 walk_state->control_state->control.package_end;
1171
1172 /* Return status depending on opcode */
1173
1174 if (op->common.aml_opcode == AML_BREAK_OP) {
1175 status = AE_CTRL_BREAK;
1176 } else {
1177 status = AE_CTRL_CONTINUE;
1178 }
1179 break;
1180
1181 default:
1182
1183 ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p",
1184 op->common.aml_opcode, op));
1185
1186 status = AE_AML_BAD_OPCODE;
1187 break;
1188 }
1189
1190 return (status);
1191 }
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