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Merge master.kernel.org:/pub/scm/linux/kernel/git/chrisw/lsm-2.6
[mirror_ubuntu-artful-kernel.git] / drivers / acpi / dispatcher / dsopcode.c
1 /******************************************************************************
2 *
3 * Module Name: dsopcode - Dispatcher Op Region support and handling of
4 * "control" opcodes
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2005, 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, 1);
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, 3);
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] buffer_field 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_REPORT_ERROR(("No pointer back to NS node in buffer obj %p\n", obj_desc));
249 return_ACPI_STATUS(AE_AML_INTERNAL);
250 }
251
252 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n"));
253
254 /* Execute the AML code for the term_arg arguments */
255
256 status = acpi_ds_execute_arguments(node, node,
257 obj_desc->buffer.aml_length,
258 obj_desc->buffer.aml_start);
259 return_ACPI_STATUS(status);
260 }
261
262 /*******************************************************************************
263 *
264 * FUNCTION: acpi_ds_get_package_arguments
265 *
266 * PARAMETERS: obj_desc - A valid Package object
267 *
268 * RETURN: Status.
269 *
270 * DESCRIPTION: Get Package length and initializer byte list. This implements
271 * the late evaluation of these attributes.
272 *
273 ******************************************************************************/
274
275 acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc)
276 {
277 struct acpi_namespace_node *node;
278 acpi_status status;
279
280 ACPI_FUNCTION_TRACE_PTR("ds_get_package_arguments", obj_desc);
281
282 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
283 return_ACPI_STATUS(AE_OK);
284 }
285
286 /* Get the Package node */
287
288 node = obj_desc->package.node;
289 if (!node) {
290 ACPI_REPORT_ERROR(("No pointer back to NS node in package %p\n",
291 obj_desc));
292 return_ACPI_STATUS(AE_AML_INTERNAL);
293 }
294
295 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n"));
296
297 /* Execute the AML code for the term_arg arguments */
298
299 status = acpi_ds_execute_arguments(node, node,
300 obj_desc->package.aml_length,
301 obj_desc->package.aml_start);
302 return_ACPI_STATUS(status);
303 }
304
305 /*****************************************************************************
306 *
307 * FUNCTION: acpi_ds_get_region_arguments
308 *
309 * PARAMETERS: obj_desc - A valid region object
310 *
311 * RETURN: Status.
312 *
313 * DESCRIPTION: Get region address and length. This implements the late
314 * evaluation of these region attributes.
315 *
316 ****************************************************************************/
317
318 acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
319 {
320 struct acpi_namespace_node *node;
321 acpi_status status;
322 union acpi_operand_object *extra_desc;
323
324 ACPI_FUNCTION_TRACE_PTR("ds_get_region_arguments", obj_desc);
325
326 if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
327 return_ACPI_STATUS(AE_OK);
328 }
329
330 extra_desc = acpi_ns_get_secondary_object(obj_desc);
331 if (!extra_desc) {
332 return_ACPI_STATUS(AE_NOT_EXIST);
333 }
334
335 /* Get the Region node */
336
337 node = obj_desc->region.node;
338
339 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
340 (ACPI_TYPE_REGION, node, NULL));
341
342 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
343 "[%4.4s] op_region Arg Init at AML %p\n",
344 acpi_ut_get_node_name(node),
345 extra_desc->extra.aml_start));
346
347 /* Execute the argument AML */
348
349 status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
350 extra_desc->extra.aml_length,
351 extra_desc->extra.aml_start);
352 return_ACPI_STATUS(status);
353 }
354
355 /*******************************************************************************
356 *
357 * FUNCTION: acpi_ds_initialize_region
358 *
359 * PARAMETERS: obj_handle - Region namespace node
360 *
361 * RETURN: Status
362 *
363 * DESCRIPTION: Front end to ev_initialize_region
364 *
365 ******************************************************************************/
366
367 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
368 {
369 union acpi_operand_object *obj_desc;
370 acpi_status status;
371
372 obj_desc = acpi_ns_get_attached_object(obj_handle);
373
374 /* Namespace is NOT locked */
375
376 status = acpi_ev_initialize_region(obj_desc, FALSE);
377 return (status);
378 }
379
380 /*******************************************************************************
381 *
382 * FUNCTION: acpi_ds_init_buffer_field
383 *
384 * PARAMETERS: aml_opcode - create_xxx_field
385 * obj_desc - buffer_field object
386 * buffer_desc - Host Buffer
387 * offset_desc - Offset into buffer
388 * length_desc - Length of field (CREATE_FIELD_OP only)
389 * result_desc - Where to store the result
390 *
391 * RETURN: Status
392 *
393 * DESCRIPTION: Perform actual initialization of a buffer field
394 *
395 ******************************************************************************/
396
397 static acpi_status
398 acpi_ds_init_buffer_field(u16 aml_opcode,
399 union acpi_operand_object *obj_desc,
400 union acpi_operand_object *buffer_desc,
401 union acpi_operand_object *offset_desc,
402 union acpi_operand_object *length_desc,
403 union acpi_operand_object *result_desc)
404 {
405 u32 offset;
406 u32 bit_offset;
407 u32 bit_count;
408 u8 field_flags;
409 acpi_status status;
410
411 ACPI_FUNCTION_TRACE_PTR("ds_init_buffer_field", obj_desc);
412
413 /* Host object must be a Buffer */
414
415 if (ACPI_GET_OBJECT_TYPE(buffer_desc) != ACPI_TYPE_BUFFER) {
416 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
417 "Target of Create Field is not a Buffer object - %s\n",
418 acpi_ut_get_object_type_name(buffer_desc)));
419
420 status = AE_AML_OPERAND_TYPE;
421 goto cleanup;
422 }
423
424 /*
425 * The last parameter to all of these opcodes (result_desc) started
426 * out as a name_string, and should therefore now be a NS node
427 * after resolution in acpi_ex_resolve_operands().
428 */
429 if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
430 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
431 "(%s) destination not a NS Node [%s]\n",
432 acpi_ps_get_opcode_name(aml_opcode),
433 acpi_ut_get_descriptor_name(result_desc)));
434
435 status = AE_AML_OPERAND_TYPE;
436 goto cleanup;
437 }
438
439 offset = (u32) offset_desc->integer.value;
440
441 /*
442 * Setup the Bit offsets and counts, according to the opcode
443 */
444 switch (aml_opcode) {
445 case AML_CREATE_FIELD_OP:
446
447 /* Offset is in bits, count is in bits */
448
449 field_flags = AML_FIELD_ACCESS_BYTE;
450 bit_offset = offset;
451 bit_count = (u32) length_desc->integer.value;
452
453 /* Must have a valid (>0) bit count */
454
455 if (bit_count == 0) {
456 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
457 "Attempt to create_field of length 0\n"));
458 status = AE_AML_OPERAND_VALUE;
459 goto cleanup;
460 }
461 break;
462
463 case AML_CREATE_BIT_FIELD_OP:
464
465 /* Offset is in bits, Field is one bit */
466
467 bit_offset = offset;
468 bit_count = 1;
469 field_flags = AML_FIELD_ACCESS_BYTE;
470 break;
471
472 case AML_CREATE_BYTE_FIELD_OP:
473
474 /* Offset is in bytes, field is one byte */
475
476 bit_offset = 8 * offset;
477 bit_count = 8;
478 field_flags = AML_FIELD_ACCESS_BYTE;
479 break;
480
481 case AML_CREATE_WORD_FIELD_OP:
482
483 /* Offset is in bytes, field is one word */
484
485 bit_offset = 8 * offset;
486 bit_count = 16;
487 field_flags = AML_FIELD_ACCESS_WORD;
488 break;
489
490 case AML_CREATE_DWORD_FIELD_OP:
491
492 /* Offset is in bytes, field is one dword */
493
494 bit_offset = 8 * offset;
495 bit_count = 32;
496 field_flags = AML_FIELD_ACCESS_DWORD;
497 break;
498
499 case AML_CREATE_QWORD_FIELD_OP:
500
501 /* Offset is in bytes, field is one qword */
502
503 bit_offset = 8 * offset;
504 bit_count = 64;
505 field_flags = AML_FIELD_ACCESS_QWORD;
506 break;
507
508 default:
509
510 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
511 "Unknown field creation opcode %02x\n",
512 aml_opcode));
513 status = AE_AML_BAD_OPCODE;
514 goto cleanup;
515 }
516
517 /* Entire field must fit within the current length of the buffer */
518
519 if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
520 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
521 "Field [%4.4s] size %d exceeds Buffer [%4.4s] size %d (bits)\n",
522 acpi_ut_get_node_name(result_desc),
523 bit_offset + bit_count,
524 acpi_ut_get_node_name(buffer_desc->buffer.
525 node),
526 8 * (u32) buffer_desc->buffer.length));
527 status = AE_AML_BUFFER_LIMIT;
528 goto cleanup;
529 }
530
531 /*
532 * Initialize areas of the field object that are common to all fields
533 * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
534 * UPDATE_RULE = 0 (UPDATE_PRESERVE)
535 */
536 status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
537 bit_offset, bit_count);
538 if (ACPI_FAILURE(status)) {
539 goto cleanup;
540 }
541
542 obj_desc->buffer_field.buffer_obj = buffer_desc;
543
544 /* Reference count for buffer_desc inherits obj_desc count */
545
546 buffer_desc->common.reference_count = (u16)
547 (buffer_desc->common.reference_count +
548 obj_desc->common.reference_count);
549
550 cleanup:
551
552 /* Always delete the operands */
553
554 acpi_ut_remove_reference(offset_desc);
555 acpi_ut_remove_reference(buffer_desc);
556
557 if (aml_opcode == AML_CREATE_FIELD_OP) {
558 acpi_ut_remove_reference(length_desc);
559 }
560
561 /* On failure, delete the result descriptor */
562
563 if (ACPI_FAILURE(status)) {
564 acpi_ut_remove_reference(result_desc); /* Result descriptor */
565 } else {
566 /* Now the address and length are valid for this buffer_field */
567
568 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
569 }
570
571 return_ACPI_STATUS(status);
572 }
573
574 /*******************************************************************************
575 *
576 * FUNCTION: acpi_ds_eval_buffer_field_operands
577 *
578 * PARAMETERS: walk_state - Current walk
579 * Op - A valid buffer_field Op object
580 *
581 * RETURN: Status
582 *
583 * DESCRIPTION: Get buffer_field Buffer and Index
584 * Called from acpi_ds_exec_end_op during buffer_field parse tree walk
585 *
586 ******************************************************************************/
587
588 acpi_status
589 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
590 union acpi_parse_object *op)
591 {
592 acpi_status status;
593 union acpi_operand_object *obj_desc;
594 struct acpi_namespace_node *node;
595 union acpi_parse_object *next_op;
596
597 ACPI_FUNCTION_TRACE_PTR("ds_eval_buffer_field_operands", op);
598
599 /*
600 * This is where we evaluate the address and length fields of the
601 * create_xxx_field declaration
602 */
603 node = op->common.node;
604
605 /* next_op points to the op that holds the Buffer */
606
607 next_op = op->common.value.arg;
608
609 /* Evaluate/create the address and length operands */
610
611 status = acpi_ds_create_operands(walk_state, next_op);
612 if (ACPI_FAILURE(status)) {
613 return_ACPI_STATUS(status);
614 }
615
616 obj_desc = acpi_ns_get_attached_object(node);
617 if (!obj_desc) {
618 return_ACPI_STATUS(AE_NOT_EXIST);
619 }
620
621 /* Resolve the operands */
622
623 status = acpi_ex_resolve_operands(op->common.aml_opcode,
624 ACPI_WALK_OPERANDS, walk_state);
625
626 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
627 acpi_ps_get_opcode_name(op->common.aml_opcode),
628 walk_state->num_operands,
629 "after acpi_ex_resolve_operands");
630
631 if (ACPI_FAILURE(status)) {
632 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "(%s) bad operand(s) (%X)\n",
633 acpi_ps_get_opcode_name(op->common.
634 aml_opcode), status));
635
636 return_ACPI_STATUS(status);
637 }
638
639 /* Initialize the Buffer Field */
640
641 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
642 /* NOTE: Slightly different operands for this opcode */
643
644 status =
645 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
646 walk_state->operands[0],
647 walk_state->operands[1],
648 walk_state->operands[2],
649 walk_state->operands[3]);
650 } else {
651 /* All other, create_xxx_field opcodes */
652
653 status =
654 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
655 walk_state->operands[0],
656 walk_state->operands[1], NULL,
657 walk_state->operands[2]);
658 }
659
660 return_ACPI_STATUS(status);
661 }
662
663 /*******************************************************************************
664 *
665 * FUNCTION: acpi_ds_eval_region_operands
666 *
667 * PARAMETERS: walk_state - Current walk
668 * Op - A valid region Op object
669 *
670 * RETURN: Status
671 *
672 * DESCRIPTION: Get region address and length
673 * Called from acpi_ds_exec_end_op during op_region parse tree walk
674 *
675 ******************************************************************************/
676
677 acpi_status
678 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
679 union acpi_parse_object *op)
680 {
681 acpi_status status;
682 union acpi_operand_object *obj_desc;
683 union acpi_operand_object *operand_desc;
684 struct acpi_namespace_node *node;
685 union acpi_parse_object *next_op;
686
687 ACPI_FUNCTION_TRACE_PTR("ds_eval_region_operands", op);
688
689 /*
690 * This is where we evaluate the address and length fields of the
691 * op_region declaration
692 */
693 node = op->common.node;
694
695 /* next_op points to the op that holds the space_iD */
696
697 next_op = op->common.value.arg;
698
699 /* next_op points to address op */
700
701 next_op = next_op->common.next;
702
703 /* Evaluate/create the address and length operands */
704
705 status = acpi_ds_create_operands(walk_state, next_op);
706 if (ACPI_FAILURE(status)) {
707 return_ACPI_STATUS(status);
708 }
709
710 /* Resolve the length and address operands to numbers */
711
712 status = acpi_ex_resolve_operands(op->common.aml_opcode,
713 ACPI_WALK_OPERANDS, walk_state);
714 if (ACPI_FAILURE(status)) {
715 return_ACPI_STATUS(status);
716 }
717
718 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
719 acpi_ps_get_opcode_name(op->common.aml_opcode),
720 1, "after acpi_ex_resolve_operands");
721
722 obj_desc = acpi_ns_get_attached_object(node);
723 if (!obj_desc) {
724 return_ACPI_STATUS(AE_NOT_EXIST);
725 }
726
727 /*
728 * Get the length operand and save it
729 * (at Top of stack)
730 */
731 operand_desc = walk_state->operands[walk_state->num_operands - 1];
732
733 obj_desc->region.length = (u32) operand_desc->integer.value;
734 acpi_ut_remove_reference(operand_desc);
735
736 /*
737 * Get the address and save it
738 * (at top of stack - 1)
739 */
740 operand_desc = walk_state->operands[walk_state->num_operands - 2];
741
742 obj_desc->region.address = (acpi_physical_address)
743 operand_desc->integer.value;
744 acpi_ut_remove_reference(operand_desc);
745
746 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "rgn_obj %p Addr %8.8X%8.8X Len %X\n",
747 obj_desc,
748 ACPI_FORMAT_UINT64(obj_desc->region.address),
749 obj_desc->region.length));
750
751 /* Now the address and length are valid for this opregion */
752
753 obj_desc->region.flags |= AOPOBJ_DATA_VALID;
754
755 return_ACPI_STATUS(status);
756 }
757
758 /*******************************************************************************
759 *
760 * FUNCTION: acpi_ds_eval_data_object_operands
761 *
762 * PARAMETERS: walk_state - Current walk
763 * Op - A valid data_object Op object
764 * obj_desc - data_object
765 *
766 * RETURN: Status
767 *
768 * DESCRIPTION: Get the operands and complete the following data object types:
769 * Buffer, Package.
770 *
771 ******************************************************************************/
772
773 acpi_status
774 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
775 union acpi_parse_object *op,
776 union acpi_operand_object *obj_desc)
777 {
778 acpi_status status;
779 union acpi_operand_object *arg_desc;
780 u32 length;
781
782 ACPI_FUNCTION_TRACE("ds_eval_data_object_operands");
783
784 /* The first operand (for all of these data objects) is the length */
785
786 status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
787 if (ACPI_FAILURE(status)) {
788 return_ACPI_STATUS(status);
789 }
790
791 status = acpi_ex_resolve_operands(walk_state->opcode,
792 &(walk_state->
793 operands[walk_state->num_operands -
794 1]), walk_state);
795 if (ACPI_FAILURE(status)) {
796 return_ACPI_STATUS(status);
797 }
798
799 /* Extract length operand */
800
801 arg_desc = walk_state->operands[walk_state->num_operands - 1];
802 length = (u32) arg_desc->integer.value;
803
804 /* Cleanup for length operand */
805
806 status = acpi_ds_obj_stack_pop(1, walk_state);
807 if (ACPI_FAILURE(status)) {
808 return_ACPI_STATUS(status);
809 }
810
811 acpi_ut_remove_reference(arg_desc);
812
813 /*
814 * Create the actual data object
815 */
816 switch (op->common.aml_opcode) {
817 case AML_BUFFER_OP:
818
819 status =
820 acpi_ds_build_internal_buffer_obj(walk_state, op, length,
821 &obj_desc);
822 break;
823
824 case AML_PACKAGE_OP:
825 case AML_VAR_PACKAGE_OP:
826
827 status =
828 acpi_ds_build_internal_package_obj(walk_state, op, length,
829 &obj_desc);
830 break;
831
832 default:
833 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
834 }
835
836 if (ACPI_SUCCESS(status)) {
837 /*
838 * Return the object in the walk_state, unless the parent is a package -
839 * in this case, the return object will be stored in the parse tree
840 * for the package.
841 */
842 if ((!op->common.parent) ||
843 ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
844 (op->common.parent->common.aml_opcode !=
845 AML_VAR_PACKAGE_OP)
846 && (op->common.parent->common.aml_opcode !=
847 AML_NAME_OP))) {
848 walk_state->result_obj = obj_desc;
849 }
850 }
851
852 return_ACPI_STATUS(status);
853 }
854
855 /*******************************************************************************
856 *
857 * FUNCTION: acpi_ds_exec_begin_control_op
858 *
859 * PARAMETERS: walk_list - The list that owns the walk stack
860 * Op - The control Op
861 *
862 * RETURN: Status
863 *
864 * DESCRIPTION: Handles all control ops encountered during control method
865 * execution.
866 *
867 ******************************************************************************/
868
869 acpi_status
870 acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
871 union acpi_parse_object *op)
872 {
873 acpi_status status = AE_OK;
874 union acpi_generic_state *control_state;
875
876 ACPI_FUNCTION_NAME("ds_exec_begin_control_op");
877
878 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
879 op->common.aml_opcode, walk_state));
880
881 switch (op->common.aml_opcode) {
882 case AML_IF_OP:
883 case AML_WHILE_OP:
884
885 /*
886 * IF/WHILE: Create a new control state to manage these
887 * constructs. We need to manage these as a stack, in order
888 * to handle nesting.
889 */
890 control_state = acpi_ut_create_control_state();
891 if (!control_state) {
892 status = AE_NO_MEMORY;
893 break;
894 }
895 /*
896 * Save a pointer to the predicate for multiple executions
897 * of a loop
898 */
899 control_state->control.aml_predicate_start =
900 walk_state->parser_state.aml - 1;
901 control_state->control.package_end =
902 walk_state->parser_state.pkg_end;
903 control_state->control.opcode = op->common.aml_opcode;
904
905 /* Push the control state on this walk's control stack */
906
907 acpi_ut_push_generic_state(&walk_state->control_state,
908 control_state);
909 break;
910
911 case AML_ELSE_OP:
912
913 /* Predicate is in the state object */
914 /* If predicate is true, the IF was executed, ignore ELSE part */
915
916 if (walk_state->last_predicate) {
917 status = AE_CTRL_TRUE;
918 }
919
920 break;
921
922 case AML_RETURN_OP:
923
924 break;
925
926 default:
927 break;
928 }
929
930 return (status);
931 }
932
933 /*******************************************************************************
934 *
935 * FUNCTION: acpi_ds_exec_end_control_op
936 *
937 * PARAMETERS: walk_list - The list that owns the walk stack
938 * Op - The control Op
939 *
940 * RETURN: Status
941 *
942 * DESCRIPTION: Handles all control ops encountered during control method
943 * execution.
944 *
945 ******************************************************************************/
946
947 acpi_status
948 acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
949 union acpi_parse_object * op)
950 {
951 acpi_status status = AE_OK;
952 union acpi_generic_state *control_state;
953
954 ACPI_FUNCTION_NAME("ds_exec_end_control_op");
955
956 switch (op->common.aml_opcode) {
957 case AML_IF_OP:
958
959 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
960
961 /*
962 * Save the result of the predicate in case there is an
963 * ELSE to come
964 */
965 walk_state->last_predicate =
966 (u8) walk_state->control_state->common.value;
967
968 /*
969 * Pop the control state that was created at the start
970 * of the IF and free it
971 */
972 control_state =
973 acpi_ut_pop_generic_state(&walk_state->control_state);
974 acpi_ut_delete_generic_state(control_state);
975 break;
976
977 case AML_ELSE_OP:
978
979 break;
980
981 case AML_WHILE_OP:
982
983 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
984
985 if (walk_state->control_state->common.value) {
986 /* Predicate was true, go back and evaluate it again! */
987
988 status = AE_CTRL_PENDING;
989 }
990
991 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
992 "[WHILE_OP] termination! Op=%p\n", op));
993
994 /* Pop this control state and free it */
995
996 control_state =
997 acpi_ut_pop_generic_state(&walk_state->control_state);
998
999 walk_state->aml_last_while =
1000 control_state->control.aml_predicate_start;
1001 acpi_ut_delete_generic_state(control_state);
1002 break;
1003
1004 case AML_RETURN_OP:
1005
1006 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1007 "[RETURN_OP] Op=%p Arg=%p\n", op,
1008 op->common.value.arg));
1009
1010 /*
1011 * One optional operand -- the return value
1012 * It can be either an immediate operand or a result that
1013 * has been bubbled up the tree
1014 */
1015 if (op->common.value.arg) {
1016 /* Since we have a real Return(), delete any implicit return */
1017
1018 acpi_ds_clear_implicit_return(walk_state);
1019
1020 /* Return statement has an immediate operand */
1021
1022 status =
1023 acpi_ds_create_operands(walk_state,
1024 op->common.value.arg);
1025 if (ACPI_FAILURE(status)) {
1026 return (status);
1027 }
1028
1029 /*
1030 * If value being returned is a Reference (such as
1031 * an arg or local), resolve it now because it may
1032 * cease to exist at the end of the method.
1033 */
1034 status =
1035 acpi_ex_resolve_to_value(&walk_state->operands[0],
1036 walk_state);
1037 if (ACPI_FAILURE(status)) {
1038 return (status);
1039 }
1040
1041 /*
1042 * Get the return value and save as the last result
1043 * value. This is the only place where walk_state->return_desc
1044 * is set to anything other than zero!
1045 */
1046 walk_state->return_desc = walk_state->operands[0];
1047 } else if ((walk_state->results) &&
1048 (walk_state->results->results.num_results > 0)) {
1049 /* Since we have a real Return(), delete any implicit return */
1050
1051 acpi_ds_clear_implicit_return(walk_state);
1052
1053 /*
1054 * The return value has come from a previous calculation.
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 * Allow references created by the Index operator to return unchanged.
1061 */
1062 if ((ACPI_GET_DESCRIPTOR_TYPE
1063 (walk_state->results->results.obj_desc[0]) ==
1064 ACPI_DESC_TYPE_OPERAND)
1065 &&
1066 (ACPI_GET_OBJECT_TYPE
1067 (walk_state->results->results.obj_desc[0]) ==
1068 ACPI_TYPE_LOCAL_REFERENCE)
1069 && ((walk_state->results->results.obj_desc[0])->
1070 reference.opcode != AML_INDEX_OP)) {
1071 status =
1072 acpi_ex_resolve_to_value(&walk_state->
1073 results->results.
1074 obj_desc[0],
1075 walk_state);
1076 if (ACPI_FAILURE(status)) {
1077 return (status);
1078 }
1079 }
1080
1081 walk_state->return_desc =
1082 walk_state->results->results.obj_desc[0];
1083 } else {
1084 /* No return operand */
1085
1086 if (walk_state->num_operands) {
1087 acpi_ut_remove_reference(walk_state->
1088 operands[0]);
1089 }
1090
1091 walk_state->operands[0] = NULL;
1092 walk_state->num_operands = 0;
1093 walk_state->return_desc = NULL;
1094 }
1095
1096 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1097 "Completed RETURN_OP State=%p, ret_val=%p\n",
1098 walk_state, walk_state->return_desc));
1099
1100 /* End the control method execution right now */
1101
1102 status = AE_CTRL_TERMINATE;
1103 break;
1104
1105 case AML_NOOP_OP:
1106
1107 /* Just do nothing! */
1108 break;
1109
1110 case AML_BREAK_POINT_OP:
1111
1112 /* Call up to the OS service layer to handle this */
1113
1114 status =
1115 acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
1116 "Executed AML Breakpoint opcode");
1117
1118 /* If and when it returns, all done. */
1119
1120 break;
1121
1122 case AML_BREAK_OP:
1123 case AML_CONTINUE_OP: /* ACPI 2.0 */
1124
1125 /* Pop and delete control states until we find a while */
1126
1127 while (walk_state->control_state &&
1128 (walk_state->control_state->control.opcode !=
1129 AML_WHILE_OP)) {
1130 control_state =
1131 acpi_ut_pop_generic_state(&walk_state->
1132 control_state);
1133 acpi_ut_delete_generic_state(control_state);
1134 }
1135
1136 /* No while found? */
1137
1138 if (!walk_state->control_state) {
1139 return (AE_AML_NO_WHILE);
1140 }
1141
1142 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
1143
1144 walk_state->aml_last_while =
1145 walk_state->control_state->control.package_end;
1146
1147 /* Return status depending on opcode */
1148
1149 if (op->common.aml_opcode == AML_BREAK_OP) {
1150 status = AE_CTRL_BREAK;
1151 } else {
1152 status = AE_CTRL_CONTINUE;
1153 }
1154 break;
1155
1156 default:
1157
1158 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1159 "Unknown control opcode=%X Op=%p\n",
1160 op->common.aml_opcode, op));
1161
1162 status = AE_AML_BAD_OPCODE;
1163 break;
1164 }
1165
1166 return (status);
1167 }
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