1 /******************************************************************************
2 *
3 * Module Name: dswstate - Dispatcher parse tree walk management routines
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2004, R. Byron Moore
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44
45 #include <acpi/acpi.h>
46 #include <acpi/acparser.h>
47 #include <acpi/acdispat.h>
48 #include <acpi/acnamesp.h>
49
50 #define _COMPONENT ACPI_DISPATCHER
51 ACPI_MODULE_NAME ("dswstate")
52
53
54 /*******************************************************************************
55 *
56 * FUNCTION: acpi_ds_result_insert
57 *
58 * PARAMETERS: Object - Object to push
59 * Index - Where to insert the object
60 * walk_state - Current Walk state
61 *
62 * RETURN: Status
63 *
64 * DESCRIPTION: Insert an object onto this walk's result stack
65 *
66 ******************************************************************************/
67
68 acpi_status
acpi_ds_result_insert(void * object,u32 index,struct acpi_walk_state * walk_state)69 acpi_ds_result_insert (
70 void *object,
71 u32 index,
72 struct acpi_walk_state *walk_state)
73 {
74 union acpi_generic_state *state;
75
76
77 ACPI_FUNCTION_NAME ("ds_result_insert");
78
79
80 state = walk_state->results;
81 if (!state) {
82 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No result object pushed! State=%p\n",
83 walk_state));
84 return (AE_NOT_EXIST);
85 }
86
87 if (index >= ACPI_OBJ_NUM_OPERANDS) {
88 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
89 "Index out of range: %X Obj=%p State=%p Num=%X\n",
90 index, object, walk_state, state->results.num_results));
91 return (AE_BAD_PARAMETER);
92 }
93
94 if (!object) {
95 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
96 "Null Object! Index=%X Obj=%p State=%p Num=%X\n",
97 index, object, walk_state, state->results.num_results));
98 return (AE_BAD_PARAMETER);
99 }
100
101 state->results.obj_desc [index] = object;
102 state->results.num_results++;
103
104 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
105 "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
106 object, object ? acpi_ut_get_object_type_name ((union acpi_operand_object *) object) : "NULL",
107 walk_state, state->results.num_results, walk_state->current_result));
108
109 return (AE_OK);
110 }
111
112
113 /*******************************************************************************
114 *
115 * FUNCTION: acpi_ds_result_remove
116 *
117 * PARAMETERS: Object - Where to return the popped object
118 * Index - Where to extract the object
119 * walk_state - Current Walk state
120 *
121 * RETURN: Status
122 *
123 * DESCRIPTION: Pop an object off the bottom of this walk's result stack. In
124 * other words, this is a FIFO.
125 *
126 ******************************************************************************/
127
128 acpi_status
acpi_ds_result_remove(union acpi_operand_object ** object,u32 index,struct acpi_walk_state * walk_state)129 acpi_ds_result_remove (
130 union acpi_operand_object **object,
131 u32 index,
132 struct acpi_walk_state *walk_state)
133 {
134 union acpi_generic_state *state;
135
136
137 ACPI_FUNCTION_NAME ("ds_result_remove");
138
139
140 state = walk_state->results;
141 if (!state) {
142 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No result object pushed! State=%p\n",
143 walk_state));
144 return (AE_NOT_EXIST);
145 }
146
147 if (index >= ACPI_OBJ_MAX_OPERAND) {
148 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
149 "Index out of range: %X State=%p Num=%X\n",
150 index, walk_state, state->results.num_results));
151 }
152
153 /* Check for a valid result object */
154
155 if (!state->results.obj_desc [index]) {
156 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
157 "Null operand! State=%p #Ops=%X, Index=%X\n",
158 walk_state, state->results.num_results, index));
159 return (AE_AML_NO_RETURN_VALUE);
160 }
161
162 /* Remove the object */
163
164 state->results.num_results--;
165
166 *object = state->results.obj_desc [index];
167 state->results.obj_desc [index] = NULL;
168
169 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
170 "Obj=%p [%s] Index=%X State=%p Num=%X\n",
171 *object, (*object) ? acpi_ut_get_object_type_name (*object) : "NULL",
172 index, walk_state, state->results.num_results));
173
174 return (AE_OK);
175 }
176
177
178 /*******************************************************************************
179 *
180 * FUNCTION: acpi_ds_result_pop
181 *
182 * PARAMETERS: Object - Where to return the popped object
183 * walk_state - Current Walk state
184 *
185 * RETURN: Status
186 *
187 * DESCRIPTION: Pop an object off the bottom of this walk's result stack. In
188 * other words, this is a FIFO.
189 *
190 ******************************************************************************/
191
192 acpi_status
acpi_ds_result_pop(union acpi_operand_object ** object,struct acpi_walk_state * walk_state)193 acpi_ds_result_pop (
194 union acpi_operand_object **object,
195 struct acpi_walk_state *walk_state)
196 {
197 acpi_native_uint index;
198 union acpi_generic_state *state;
199
200
201 ACPI_FUNCTION_NAME ("ds_result_pop");
202
203
204 state = walk_state->results;
205 if (!state) {
206 return (AE_OK);
207 }
208
209 if (!state->results.num_results) {
210 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Result stack is empty! State=%p\n",
211 walk_state));
212 return (AE_AML_NO_RETURN_VALUE);
213 }
214
215 /* Remove top element */
216
217 state->results.num_results--;
218
219 for (index = ACPI_OBJ_NUM_OPERANDS; index; index--) {
220 /* Check for a valid result object */
221
222 if (state->results.obj_desc [index -1]) {
223 *object = state->results.obj_desc [index -1];
224 state->results.obj_desc [index -1] = NULL;
225
226 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] Index=%X State=%p Num=%X\n",
227 *object, (*object) ? acpi_ut_get_object_type_name (*object) : "NULL",
228 (u32) index -1, walk_state, state->results.num_results));
229
230 return (AE_OK);
231 }
232 }
233
234 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No result objects! State=%p\n", walk_state));
235 return (AE_AML_NO_RETURN_VALUE);
236 }
237
238
239 /*******************************************************************************
240 *
241 * FUNCTION: acpi_ds_result_pop_from_bottom
242 *
243 * PARAMETERS: Object - Where to return the popped object
244 * walk_state - Current Walk state
245 *
246 * RETURN: Status
247 *
248 * DESCRIPTION: Pop an object off the bottom of this walk's result stack. In
249 * other words, this is a FIFO.
250 *
251 ******************************************************************************/
252
253 acpi_status
acpi_ds_result_pop_from_bottom(union acpi_operand_object ** object,struct acpi_walk_state * walk_state)254 acpi_ds_result_pop_from_bottom (
255 union acpi_operand_object **object,
256 struct acpi_walk_state *walk_state)
257 {
258 acpi_native_uint index;
259 union acpi_generic_state *state;
260
261
262 ACPI_FUNCTION_NAME ("ds_result_pop_from_bottom");
263
264
265 state = walk_state->results;
266 if (!state) {
267 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
268 "Warning: No result object pushed! State=%p\n", walk_state));
269 return (AE_NOT_EXIST);
270 }
271
272 if (!state->results.num_results) {
273 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No result objects! State=%p\n", walk_state));
274 return (AE_AML_NO_RETURN_VALUE);
275 }
276
277 /* Remove Bottom element */
278
279 *object = state->results.obj_desc [0];
280
281 /* Push entire stack down one element */
282
283 for (index = 0; index < state->results.num_results; index++) {
284 state->results.obj_desc [index] = state->results.obj_desc [index + 1];
285 }
286
287 state->results.num_results--;
288
289 /* Check for a valid result object */
290
291 if (!*object) {
292 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null operand! State=%p #Ops=%X, Index=%X\n",
293 walk_state, state->results.num_results, (u32) index));
294 return (AE_AML_NO_RETURN_VALUE);
295 }
296
297 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s], Results=%p State=%p\n",
298 *object, (*object) ? acpi_ut_get_object_type_name (*object) : "NULL",
299 state, walk_state));
300
301 return (AE_OK);
302 }
303
304
305 /*******************************************************************************
306 *
307 * FUNCTION: acpi_ds_result_push
308 *
309 * PARAMETERS: Object - Where to return the popped object
310 * walk_state - Current Walk state
311 *
312 * RETURN: Status
313 *
314 * DESCRIPTION: Push an object onto the current result stack
315 *
316 ******************************************************************************/
317
318 acpi_status
acpi_ds_result_push(union acpi_operand_object * object,struct acpi_walk_state * walk_state)319 acpi_ds_result_push (
320 union acpi_operand_object *object,
321 struct acpi_walk_state *walk_state)
322 {
323 union acpi_generic_state *state;
324
325
326 ACPI_FUNCTION_NAME ("ds_result_push");
327
328
329 state = walk_state->results;
330 if (!state) {
331 ACPI_REPORT_ERROR (("No result stack frame during push\n"));
332 return (AE_AML_INTERNAL);
333 }
334
335 if (state->results.num_results == ACPI_OBJ_NUM_OPERANDS) {
336 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
337 "Result stack overflow: Obj=%p State=%p Num=%X\n",
338 object, walk_state, state->results.num_results));
339 return (AE_STACK_OVERFLOW);
340 }
341
342 if (!object) {
343 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null Object! Obj=%p State=%p Num=%X\n",
344 object, walk_state, state->results.num_results));
345 return (AE_BAD_PARAMETER);
346 }
347
348 state->results.obj_desc [state->results.num_results] = object;
349 state->results.num_results++;
350
351 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
352 object, object ? acpi_ut_get_object_type_name ((union acpi_operand_object *) object) : "NULL",
353 walk_state, state->results.num_results, walk_state->current_result));
354
355 return (AE_OK);
356 }
357
358
359 /*******************************************************************************
360 *
361 * FUNCTION: acpi_ds_result_stack_push
362 *
363 * PARAMETERS: walk_state - Current Walk state
364 *
365 * RETURN: Status
366 *
367 * DESCRIPTION: Push an object onto the walk_state result stack.
368 *
369 ******************************************************************************/
370
371 acpi_status
acpi_ds_result_stack_push(struct acpi_walk_state * walk_state)372 acpi_ds_result_stack_push (
373 struct acpi_walk_state *walk_state)
374 {
375 union acpi_generic_state *state;
376
377 ACPI_FUNCTION_NAME ("ds_result_stack_push");
378
379
380 state = acpi_ut_create_generic_state ();
381 if (!state) {
382 return (AE_NO_MEMORY);
383 }
384
385 state->common.data_type = ACPI_DESC_TYPE_STATE_RESULT;
386 acpi_ut_push_generic_state (&walk_state->results, state);
387
388 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Results=%p State=%p\n",
389 state, walk_state));
390
391 return (AE_OK);
392 }
393
394
395 /*******************************************************************************
396 *
397 * FUNCTION: acpi_ds_result_stack_pop
398 *
399 * PARAMETERS: walk_state - Current Walk state
400 *
401 * RETURN: Status
402 *
403 * DESCRIPTION: Pop an object off of the walk_state result stack.
404 *
405 ******************************************************************************/
406
407 acpi_status
acpi_ds_result_stack_pop(struct acpi_walk_state * walk_state)408 acpi_ds_result_stack_pop (
409 struct acpi_walk_state *walk_state)
410 {
411 union acpi_generic_state *state;
412
413 ACPI_FUNCTION_NAME ("ds_result_stack_pop");
414
415
416 /* Check for stack underflow */
417
418 if (walk_state->results == NULL) {
419 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Underflow - State=%p\n",
420 walk_state));
421 return (AE_AML_NO_OPERAND);
422 }
423
424 state = acpi_ut_pop_generic_state (&walk_state->results);
425
426 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
427 "Result=%p remaining_results=%X State=%p\n",
428 state, state->results.num_results, walk_state));
429
430 acpi_ut_delete_generic_state (state);
431
432 return (AE_OK);
433 }
434
435
436 /*******************************************************************************
437 *
438 * FUNCTION: acpi_ds_obj_stack_delete_all
439 *
440 * PARAMETERS: walk_state - Current Walk state
441 *
442 * RETURN: Status
443 *
444 * DESCRIPTION: Clear the object stack by deleting all objects that are on it.
445 * Should be used with great care, if at all!
446 *
447 ******************************************************************************/
448
449 acpi_status
acpi_ds_obj_stack_delete_all(struct acpi_walk_state * walk_state)450 acpi_ds_obj_stack_delete_all (
451 struct acpi_walk_state *walk_state)
452 {
453 u32 i;
454
455
456 ACPI_FUNCTION_TRACE_PTR ("ds_obj_stack_delete_all", walk_state);
457
458
459 /* The stack size is configurable, but fixed */
460
461 for (i = 0; i < ACPI_OBJ_NUM_OPERANDS; i++) {
462 if (walk_state->operands[i]) {
463 acpi_ut_remove_reference (walk_state->operands[i]);
464 walk_state->operands[i] = NULL;
465 }
466 }
467
468 return_ACPI_STATUS (AE_OK);
469 }
470
471
472 /*******************************************************************************
473 *
474 * FUNCTION: acpi_ds_obj_stack_push
475 *
476 * PARAMETERS: Object - Object to push
477 * walk_state - Current Walk state
478 *
479 * RETURN: Status
480 *
481 * DESCRIPTION: Push an object onto this walk's object/operand stack
482 *
483 ******************************************************************************/
484
485 acpi_status
acpi_ds_obj_stack_push(void * object,struct acpi_walk_state * walk_state)486 acpi_ds_obj_stack_push (
487 void *object,
488 struct acpi_walk_state *walk_state)
489 {
490 ACPI_FUNCTION_NAME ("ds_obj_stack_push");
491
492
493 /* Check for stack overflow */
494
495 if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) {
496 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
497 "overflow! Obj=%p State=%p #Ops=%X\n",
498 object, walk_state, walk_state->num_operands));
499 return (AE_STACK_OVERFLOW);
500 }
501
502 /* Put the object onto the stack */
503
504 walk_state->operands [walk_state->num_operands] = object;
505 walk_state->num_operands++;
506
507 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
508 object, acpi_ut_get_object_type_name ((union acpi_operand_object *) object),
509 walk_state, walk_state->num_operands));
510
511 return (AE_OK);
512 }
513
514
515 #if 0
516 /*******************************************************************************
517 *
518 * FUNCTION: acpi_ds_obj_stack_pop_object
519 *
520 * PARAMETERS: pop_count - Number of objects/entries to pop
521 * walk_state - Current Walk state
522 *
523 * RETURN: Status
524 *
525 * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT
526 * deleted by this routine.
527 *
528 ******************************************************************************/
529
530 acpi_status
531 acpi_ds_obj_stack_pop_object (
532 union acpi_operand_object **object,
533 struct acpi_walk_state *walk_state)
534 {
535 ACPI_FUNCTION_NAME ("ds_obj_stack_pop_object");
536
537
538 /* Check for stack underflow */
539
540 if (walk_state->num_operands == 0) {
541 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
542 "Missing operand/stack empty! State=%p #Ops=%X\n",
543 walk_state, walk_state->num_operands));
544 *object = NULL;
545 return (AE_AML_NO_OPERAND);
546 }
547
548 /* Pop the stack */
549
550 walk_state->num_operands--;
551
552 /* Check for a valid operand */
553
554 if (!walk_state->operands [walk_state->num_operands]) {
555 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
556 "Null operand! State=%p #Ops=%X\n",
557 walk_state, walk_state->num_operands));
558 *object = NULL;
559 return (AE_AML_NO_OPERAND);
560 }
561
562 /* Get operand and set stack entry to null */
563
564 *object = walk_state->operands [walk_state->num_operands];
565 walk_state->operands [walk_state->num_operands] = NULL;
566
567 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
568 *object, acpi_ut_get_object_type_name (*object),
569 walk_state, walk_state->num_operands));
570
571 return (AE_OK);
572 }
573 #endif
574
575
576 /*******************************************************************************
577 *
578 * FUNCTION: acpi_ds_obj_stack_pop
579 *
580 * PARAMETERS: pop_count - Number of objects/entries to pop
581 * walk_state - Current Walk state
582 *
583 * RETURN: Status
584 *
585 * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT
586 * deleted by this routine.
587 *
588 ******************************************************************************/
589
590 acpi_status
acpi_ds_obj_stack_pop(u32 pop_count,struct acpi_walk_state * walk_state)591 acpi_ds_obj_stack_pop (
592 u32 pop_count,
593 struct acpi_walk_state *walk_state)
594 {
595 u32 i;
596
597 ACPI_FUNCTION_NAME ("ds_obj_stack_pop");
598
599
600 for (i = 0; i < pop_count; i++) {
601 /* Check for stack underflow */
602
603 if (walk_state->num_operands == 0) {
604 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
605 "Underflow! Count=%X State=%p #Ops=%X\n",
606 pop_count, walk_state, walk_state->num_operands));
607 return (AE_STACK_UNDERFLOW);
608 }
609
610 /* Just set the stack entry to null */
611
612 walk_state->num_operands--;
613 walk_state->operands [walk_state->num_operands] = NULL;
614 }
615
616 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
617 pop_count, walk_state, walk_state->num_operands));
618
619 return (AE_OK);
620 }
621
622
623 /*******************************************************************************
624 *
625 * FUNCTION: acpi_ds_obj_stack_pop_and_delete
626 *
627 * PARAMETERS: pop_count - Number of objects/entries to pop
628 * walk_state - Current Walk state
629 *
630 * RETURN: Status
631 *
632 * DESCRIPTION: Pop this walk's object stack and delete each object that is
633 * popped off.
634 *
635 ******************************************************************************/
636
637 acpi_status
acpi_ds_obj_stack_pop_and_delete(u32 pop_count,struct acpi_walk_state * walk_state)638 acpi_ds_obj_stack_pop_and_delete (
639 u32 pop_count,
640 struct acpi_walk_state *walk_state)
641 {
642 u32 i;
643 union acpi_operand_object *obj_desc;
644
645
646 ACPI_FUNCTION_NAME ("ds_obj_stack_pop_and_delete");
647
648
649 for (i = 0; i < pop_count; i++) {
650 /* Check for stack underflow */
651
652 if (walk_state->num_operands == 0) {
653 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
654 "Underflow! Count=%X State=%p #Ops=%X\n",
655 pop_count, walk_state, walk_state->num_operands));
656 return (AE_STACK_UNDERFLOW);
657 }
658
659 /* Pop the stack and delete an object if present in this stack entry */
660
661 walk_state->num_operands--;
662 obj_desc = walk_state->operands [walk_state->num_operands];
663 if (obj_desc) {
664 acpi_ut_remove_reference (walk_state->operands [walk_state->num_operands]);
665 walk_state->operands [walk_state->num_operands] = NULL;
666 }
667 }
668
669 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
670 pop_count, walk_state, walk_state->num_operands));
671
672 return (AE_OK);
673 }
674
675
676 /*******************************************************************************
677 *
678 * FUNCTION: acpi_ds_obj_stack_get_value
679 *
680 * PARAMETERS: Index - Stack index whose value is desired. Based
681 * on the top of the stack (index=0 == top)
682 * walk_state - Current Walk state
683 *
684 * RETURN: Status
685 *
686 * DESCRIPTION: Retrieve an object from this walk's object stack. Index must
687 * be within the range of the current stack pointer.
688 *
689 ******************************************************************************/
690
691 void *
acpi_ds_obj_stack_get_value(u32 index,struct acpi_walk_state * walk_state)692 acpi_ds_obj_stack_get_value (
693 u32 index,
694 struct acpi_walk_state *walk_state)
695 {
696
697 ACPI_FUNCTION_TRACE_PTR ("ds_obj_stack_get_value", walk_state);
698
699
700 /* Can't do it if the stack is empty */
701
702 if (walk_state->num_operands == 0) {
703 return_PTR (NULL);
704 }
705
706 /* or if the index is past the top of the stack */
707
708 if (index > (walk_state->num_operands - (u32) 1)) {
709 return_PTR (NULL);
710 }
711
712 return_PTR (walk_state->operands[(acpi_native_uint)(walk_state->num_operands - 1) -
713 index]);
714 }
715
716
717 /*******************************************************************************
718 *
719 * FUNCTION: acpi_ds_get_current_walk_state
720 *
721 * PARAMETERS: Thread - Get current active state for this Thread
722 *
723 * RETURN: Pointer to the current walk state
724 *
725 * DESCRIPTION: Get the walk state that is at the head of the list (the "current"
726 * walk state.)
727 *
728 ******************************************************************************/
729
730 struct acpi_walk_state *
acpi_ds_get_current_walk_state(struct acpi_thread_state * thread)731 acpi_ds_get_current_walk_state (
732 struct acpi_thread_state *thread)
733
734 {
735 ACPI_FUNCTION_NAME ("ds_get_current_walk_state");
736
737
738 if (!thread) {
739 return (NULL);
740 }
741
742 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Current walk_state %p\n",
743 thread->walk_state_list));
744
745 return (thread->walk_state_list);
746 }
747
748
749 /*******************************************************************************
750 *
751 * FUNCTION: acpi_ds_push_walk_state
752 *
753 * PARAMETERS: walk_state - State to push
754 * walk_list - The list that owns the walk stack
755 *
756 * RETURN: None
757 *
758 * DESCRIPTION: Place the walk_state at the head of the state list.
759 *
760 ******************************************************************************/
761
762 void
acpi_ds_push_walk_state(struct acpi_walk_state * walk_state,struct acpi_thread_state * thread)763 acpi_ds_push_walk_state (
764 struct acpi_walk_state *walk_state,
765 struct acpi_thread_state *thread)
766 {
767 ACPI_FUNCTION_TRACE ("ds_push_walk_state");
768
769
770 walk_state->next = thread->walk_state_list;
771 thread->walk_state_list = walk_state;
772
773 return_VOID;
774 }
775
776
777 /*******************************************************************************
778 *
779 * FUNCTION: acpi_ds_pop_walk_state
780 *
781 * PARAMETERS: walk_list - The list that owns the walk stack
782 *
783 * RETURN: A walk_state object popped from the stack
784 *
785 * DESCRIPTION: Remove and return the walkstate object that is at the head of
786 * the walk stack for the given walk list. NULL indicates that
787 * the list is empty.
788 *
789 ******************************************************************************/
790
791 struct acpi_walk_state *
acpi_ds_pop_walk_state(struct acpi_thread_state * thread)792 acpi_ds_pop_walk_state (
793 struct acpi_thread_state *thread)
794 {
795 struct acpi_walk_state *walk_state;
796
797
798 ACPI_FUNCTION_TRACE ("ds_pop_walk_state");
799
800
801 walk_state = thread->walk_state_list;
802
803 if (walk_state) {
804 /* Next walk state becomes the current walk state */
805
806 thread->walk_state_list = walk_state->next;
807
808 /*
809 * Don't clear the NEXT field, this serves as an indicator
810 * that there is a parent WALK STATE
811 * NO: walk_state->Next = NULL;
812 */
813 }
814
815 return_PTR (walk_state);
816 }
817
818
819 /*******************************************************************************
820 *
821 * FUNCTION: acpi_ds_create_walk_state
822 *
823 * PARAMETERS: Origin - Starting point for this walk
824 * Thread - Current thread state
825 *
826 * RETURN: Pointer to the new walk state.
827 *
828 * DESCRIPTION: Allocate and initialize a new walk state. The current walk
829 * state is set to this new state.
830 *
831 ******************************************************************************/
832
833 struct acpi_walk_state *
acpi_ds_create_walk_state(acpi_owner_id owner_id,union acpi_parse_object * origin,union acpi_operand_object * mth_desc,struct acpi_thread_state * thread)834 acpi_ds_create_walk_state (
835 acpi_owner_id owner_id,
836 union acpi_parse_object *origin,
837 union acpi_operand_object *mth_desc,
838 struct acpi_thread_state *thread)
839 {
840 struct acpi_walk_state *walk_state;
841 acpi_status status;
842
843
844 ACPI_FUNCTION_TRACE ("ds_create_walk_state");
845
846
847 walk_state = acpi_ut_acquire_from_cache (ACPI_MEM_LIST_WALK);
848 if (!walk_state) {
849 return_PTR (NULL);
850 }
851
852 walk_state->data_type = ACPI_DESC_TYPE_WALK;
853 walk_state->owner_id = owner_id;
854 walk_state->origin = origin;
855 walk_state->method_desc = mth_desc;
856 walk_state->thread = thread;
857
858 walk_state->parser_state.start_op = origin;
859
860 /* Init the method args/local */
861
862 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
863 acpi_ds_method_data_init (walk_state);
864 #endif
865
866 /* Create an initial result stack entry */
867
868 status = acpi_ds_result_stack_push (walk_state);
869 if (ACPI_FAILURE (status)) {
870 return_PTR (NULL);
871 }
872
873 /* Put the new state at the head of the walk list */
874
875 if (thread) {
876 acpi_ds_push_walk_state (walk_state, thread);
877 }
878
879 return_PTR (walk_state);
880 }
881
882
883 /*******************************************************************************
884 *
885 * FUNCTION: acpi_ds_init_aml_walk
886 *
887 * PARAMETERS: walk_state - New state to be initialized
888 * Op - Current parse op
889 * method_node - Control method NS node, if any
890 * aml_start - Start of AML
891 * aml_length - Length of AML
892 * Params - Method args, if any
893 * return_obj_desc - Where to store a return object, if any
894 * pass_number - 1, 2, or 3
895 *
896 * RETURN: Status
897 *
898 * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
899 *
900 ******************************************************************************/
901
902 acpi_status
acpi_ds_init_aml_walk(struct acpi_walk_state * walk_state,union acpi_parse_object * op,struct acpi_namespace_node * method_node,u8 * aml_start,u32 aml_length,union acpi_operand_object ** params,union acpi_operand_object ** return_obj_desc,u32 pass_number)903 acpi_ds_init_aml_walk (
904 struct acpi_walk_state *walk_state,
905 union acpi_parse_object *op,
906 struct acpi_namespace_node *method_node,
907 u8 *aml_start,
908 u32 aml_length,
909 union acpi_operand_object **params,
910 union acpi_operand_object **return_obj_desc,
911 u32 pass_number)
912 {
913 acpi_status status;
914 struct acpi_parse_state *parser_state = &walk_state->parser_state;
915 union acpi_parse_object *extra_op;
916
917
918 ACPI_FUNCTION_TRACE ("ds_init_aml_walk");
919
920
921 walk_state->parser_state.aml =
922 walk_state->parser_state.aml_start = aml_start;
923 walk_state->parser_state.aml_end =
924 walk_state->parser_state.pkg_end = aml_start + aml_length;
925
926 /* The next_op of the next_walk will be the beginning of the method */
927
928 walk_state->next_op = NULL;
929 walk_state->params = params;
930 walk_state->caller_return_desc = return_obj_desc;
931
932 status = acpi_ps_init_scope (&walk_state->parser_state, op);
933 if (ACPI_FAILURE (status)) {
934 return_ACPI_STATUS (status);
935 }
936
937 if (method_node) {
938 walk_state->parser_state.start_node = method_node;
939 walk_state->walk_type = ACPI_WALK_METHOD;
940 walk_state->method_node = method_node;
941 walk_state->method_desc = acpi_ns_get_attached_object (method_node);
942
943 /* Push start scope on scope stack and make it current */
944
945 status = acpi_ds_scope_stack_push (method_node, ACPI_TYPE_METHOD, walk_state);
946 if (ACPI_FAILURE (status)) {
947 return_ACPI_STATUS (status);
948 }
949
950 /* Init the method arguments */
951
952 status = acpi_ds_method_data_init_args (params, ACPI_METHOD_NUM_ARGS, walk_state);
953 if (ACPI_FAILURE (status)) {
954 return_ACPI_STATUS (status);
955 }
956 }
957 else {
958 /*
959 * Setup the current scope.
960 * Find a Named Op that has a namespace node associated with it.
961 * search upwards from this Op. Current scope is the first
962 * Op with a namespace node.
963 */
964 extra_op = parser_state->start_op;
965 while (extra_op && !extra_op->common.node) {
966 extra_op = extra_op->common.parent;
967 }
968
969 if (!extra_op) {
970 parser_state->start_node = NULL;
971 }
972 else {
973 parser_state->start_node = extra_op->common.node;
974 }
975
976 if (parser_state->start_node) {
977 /* Push start scope on scope stack and make it current */
978
979 status = acpi_ds_scope_stack_push (parser_state->start_node,
980 parser_state->start_node->type, walk_state);
981 if (ACPI_FAILURE (status)) {
982 return_ACPI_STATUS (status);
983 }
984 }
985 }
986
987 status = acpi_ds_init_callbacks (walk_state, pass_number);
988 return_ACPI_STATUS (status);
989 }
990
991
992 /*******************************************************************************
993 *
994 * FUNCTION: acpi_ds_delete_walk_state
995 *
996 * PARAMETERS: walk_state - State to delete
997 *
998 * RETURN: Status
999 *
1000 * DESCRIPTION: Delete a walk state including all internal data structures
1001 *
1002 ******************************************************************************/
1003
1004 void
acpi_ds_delete_walk_state(struct acpi_walk_state * walk_state)1005 acpi_ds_delete_walk_state (
1006 struct acpi_walk_state *walk_state)
1007 {
1008 union acpi_generic_state *state;
1009
1010
1011 ACPI_FUNCTION_TRACE_PTR ("ds_delete_walk_state", walk_state);
1012
1013
1014 if (!walk_state) {
1015 return;
1016 }
1017
1018 if (walk_state->data_type != ACPI_DESC_TYPE_WALK) {
1019 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%p is not a valid walk state\n", walk_state));
1020 return;
1021 }
1022
1023 if (walk_state->parser_state.scope) {
1024 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%p walk still has a scope list\n", walk_state));
1025 }
1026
1027 /* Always must free any linked control states */
1028
1029 while (walk_state->control_state) {
1030 state = walk_state->control_state;
1031 walk_state->control_state = state->common.next;
1032
1033 acpi_ut_delete_generic_state (state);
1034 }
1035
1036 /* Always must free any linked parse states */
1037
1038 while (walk_state->scope_info) {
1039 state = walk_state->scope_info;
1040 walk_state->scope_info = state->common.next;
1041
1042 acpi_ut_delete_generic_state (state);
1043 }
1044
1045 /* Always must free any stacked result states */
1046
1047 while (walk_state->results) {
1048 state = walk_state->results;
1049 walk_state->results = state->common.next;
1050
1051 acpi_ut_delete_generic_state (state);
1052 }
1053
1054 acpi_ut_release_to_cache (ACPI_MEM_LIST_WALK, walk_state);
1055 return_VOID;
1056 }
1057
1058
1059 /******************************************************************************
1060 *
1061 * FUNCTION: acpi_ds_delete_walk_state_cache
1062 *
1063 * PARAMETERS: None
1064 *
1065 * RETURN: Status
1066 *
1067 * DESCRIPTION: Purge the global state object cache. Used during subsystem
1068 * termination.
1069 *
1070 ******************************************************************************/
1071
1072 void
acpi_ds_delete_walk_state_cache(void)1073 acpi_ds_delete_walk_state_cache (
1074 void)
1075 {
1076 ACPI_FUNCTION_TRACE ("ds_delete_walk_state_cache");
1077
1078
1079 acpi_ut_delete_generic_cache (ACPI_MEM_LIST_WALK);
1080 return_VOID;
1081 }
1082
1083
1084