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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: dswstate - Dispatcher parse tree walk management routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
77848130 | 8 | * Copyright (C) 2000 - 2012, Intel Corp. |
1da177e4 LT |
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 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acparser.h" | |
47 | #include "acdispat.h" | |
48 | #include "acnamesp.h" | |
1da177e4 LT |
49 | |
50 | #define _COMPONENT ACPI_DISPATCHER | |
4be44fcd | 51 | ACPI_MODULE_NAME("dswstate") |
1da177e4 | 52 | |
773069d4 BM |
53 | /* Local prototypes */ |
54 | static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *ws); | |
55 | static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *ws); | |
1da177e4 | 56 | |
1da177e4 LT |
57 | /******************************************************************************* |
58 | * | |
59 | * FUNCTION: acpi_ds_result_pop | |
60 | * | |
ba494bee | 61 | * PARAMETERS: object - Where to return the popped object |
1da177e4 LT |
62 | * walk_state - Current Walk state |
63 | * | |
64 | * RETURN: Status | |
65 | * | |
773069d4 | 66 | * DESCRIPTION: Pop an object off the top of this walk's result stack |
1da177e4 LT |
67 | * |
68 | ******************************************************************************/ | |
69 | ||
70 | acpi_status | |
773069d4 BM |
71 | acpi_ds_result_pop(union acpi_operand_object **object, |
72 | struct acpi_walk_state *walk_state) | |
1da177e4 | 73 | { |
67a119f9 | 74 | u32 index; |
4be44fcd | 75 | union acpi_generic_state *state; |
773069d4 | 76 | acpi_status status; |
1da177e4 | 77 | |
b229cf92 | 78 | ACPI_FUNCTION_NAME(ds_result_pop); |
1da177e4 LT |
79 | |
80 | state = walk_state->results; | |
1da177e4 | 81 | |
773069d4 | 82 | /* Incorrect state of result stack */ |
1da177e4 | 83 | |
773069d4 BM |
84 | if (state && !walk_state->result_count) { |
85 | ACPI_ERROR((AE_INFO, "No results on result stack")); | |
86 | return (AE_AML_INTERNAL); | |
1da177e4 LT |
87 | } |
88 | ||
773069d4 BM |
89 | if (!state && walk_state->result_count) { |
90 | ACPI_ERROR((AE_INFO, "No result state for result stack")); | |
91 | return (AE_AML_INTERNAL); | |
92 | } | |
1da177e4 | 93 | |
773069d4 | 94 | /* Empty result stack */ |
1da177e4 | 95 | |
1da177e4 | 96 | if (!state) { |
773069d4 | 97 | ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p", |
b8e4d893 | 98 | walk_state)); |
1da177e4 LT |
99 | return (AE_AML_NO_RETURN_VALUE); |
100 | } | |
101 | ||
773069d4 | 102 | /* Return object of the top element and clean that top element result stack */ |
1da177e4 | 103 | |
773069d4 | 104 | walk_state->result_count--; |
ba9c3f55 | 105 | index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM; |
1da177e4 | 106 | |
773069d4 | 107 | *object = state->results.obj_desc[index]; |
1da177e4 | 108 | if (!*object) { |
b8e4d893 | 109 | ACPI_ERROR((AE_INFO, |
773069d4 BM |
110 | "No result objects on result stack, State=%p", |
111 | walk_state)); | |
1da177e4 LT |
112 | return (AE_AML_NO_RETURN_VALUE); |
113 | } | |
114 | ||
773069d4 BM |
115 | state->results.obj_desc[index] = NULL; |
116 | if (index == 0) { | |
117 | status = acpi_ds_result_stack_pop(walk_state); | |
118 | if (ACPI_FAILURE(status)) { | |
119 | return (status); | |
120 | } | |
121 | } | |
122 | ||
123 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
124 | "Obj=%p [%s] Index=%X State=%p Num=%X\n", *object, | |
125 | acpi_ut_get_object_type_name(*object), | |
67a119f9 | 126 | index, walk_state, walk_state->result_count)); |
1da177e4 LT |
127 | |
128 | return (AE_OK); | |
129 | } | |
130 | ||
1da177e4 LT |
131 | /******************************************************************************* |
132 | * | |
133 | * FUNCTION: acpi_ds_result_push | |
134 | * | |
ba494bee | 135 | * PARAMETERS: object - Where to return the popped object |
1da177e4 LT |
136 | * walk_state - Current Walk state |
137 | * | |
138 | * RETURN: Status | |
139 | * | |
140 | * DESCRIPTION: Push an object onto the current result stack | |
141 | * | |
142 | ******************************************************************************/ | |
143 | ||
144 | acpi_status | |
4be44fcd LB |
145 | acpi_ds_result_push(union acpi_operand_object * object, |
146 | struct acpi_walk_state * walk_state) | |
1da177e4 | 147 | { |
4be44fcd | 148 | union acpi_generic_state *state; |
773069d4 | 149 | acpi_status status; |
67a119f9 | 150 | u32 index; |
1da177e4 | 151 | |
b229cf92 | 152 | ACPI_FUNCTION_NAME(ds_result_push); |
1da177e4 | 153 | |
773069d4 BM |
154 | if (walk_state->result_count > walk_state->result_size) { |
155 | ACPI_ERROR((AE_INFO, "Result stack is full")); | |
156 | return (AE_AML_INTERNAL); | |
157 | } else if (walk_state->result_count == walk_state->result_size) { | |
158 | ||
159 | /* Extend the result stack */ | |
160 | ||
161 | status = acpi_ds_result_stack_push(walk_state); | |
162 | if (ACPI_FAILURE(status)) { | |
163 | ACPI_ERROR((AE_INFO, | |
164 | "Failed to extend the result stack")); | |
165 | return (status); | |
166 | } | |
167 | } | |
168 | ||
169 | if (!(walk_state->result_count < walk_state->result_size)) { | |
170 | ACPI_ERROR((AE_INFO, "No free elements in result stack")); | |
171 | return (AE_AML_INTERNAL); | |
172 | } | |
173 | ||
1da177e4 LT |
174 | state = walk_state->results; |
175 | if (!state) { | |
b8e4d893 | 176 | ACPI_ERROR((AE_INFO, "No result stack frame during push")); |
1da177e4 LT |
177 | return (AE_AML_INTERNAL); |
178 | } | |
179 | ||
1da177e4 | 180 | if (!object) { |
b8e4d893 | 181 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 182 | "Null Object! Obj=%p State=%p Num=%u", |
773069d4 | 183 | object, walk_state, walk_state->result_count)); |
1da177e4 LT |
184 | return (AE_BAD_PARAMETER); |
185 | } | |
186 | ||
773069d4 BM |
187 | /* Assign the address of object to the top free element of result stack */ |
188 | ||
ba9c3f55 | 189 | index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM; |
773069d4 BM |
190 | state->results.obj_desc[index] = object; |
191 | walk_state->result_count++; | |
1da177e4 | 192 | |
4be44fcd LB |
193 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n", |
194 | object, | |
4be44fcd LB |
195 | acpi_ut_get_object_type_name((union |
196 | acpi_operand_object *) | |
773069d4 BM |
197 | object), walk_state, |
198 | walk_state->result_count, | |
4be44fcd | 199 | walk_state->current_result)); |
1da177e4 LT |
200 | |
201 | return (AE_OK); | |
202 | } | |
203 | ||
1da177e4 LT |
204 | /******************************************************************************* |
205 | * | |
206 | * FUNCTION: acpi_ds_result_stack_push | |
207 | * | |
208 | * PARAMETERS: walk_state - Current Walk state | |
209 | * | |
210 | * RETURN: Status | |
211 | * | |
773069d4 | 212 | * DESCRIPTION: Push an object onto the walk_state result stack |
1da177e4 LT |
213 | * |
214 | ******************************************************************************/ | |
215 | ||
773069d4 | 216 | static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *walk_state) |
1da177e4 | 217 | { |
4be44fcd | 218 | union acpi_generic_state *state; |
1da177e4 | 219 | |
b229cf92 | 220 | ACPI_FUNCTION_NAME(ds_result_stack_push); |
1da177e4 | 221 | |
773069d4 BM |
222 | /* Check for stack overflow */ |
223 | ||
b7f9f042 | 224 | if (((u32) walk_state->result_size + ACPI_RESULTS_FRAME_OBJ_NUM) > |
773069d4 | 225 | ACPI_RESULTS_OBJ_NUM_MAX) { |
f6a22b0b | 226 | ACPI_ERROR((AE_INFO, "Result stack overflow: State=%p Num=%u", |
773069d4 BM |
227 | walk_state, walk_state->result_size)); |
228 | return (AE_STACK_OVERFLOW); | |
229 | } | |
230 | ||
4be44fcd | 231 | state = acpi_ut_create_generic_state(); |
1da177e4 LT |
232 | if (!state) { |
233 | return (AE_NO_MEMORY); | |
234 | } | |
235 | ||
61686124 | 236 | state->common.descriptor_type = ACPI_DESC_TYPE_STATE_RESULT; |
4be44fcd | 237 | acpi_ut_push_generic_state(&walk_state->results, state); |
1da177e4 | 238 | |
773069d4 BM |
239 | /* Increase the length of the result stack by the length of frame */ |
240 | ||
241 | walk_state->result_size += ACPI_RESULTS_FRAME_OBJ_NUM; | |
242 | ||
4be44fcd LB |
243 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n", |
244 | state, walk_state)); | |
1da177e4 LT |
245 | |
246 | return (AE_OK); | |
247 | } | |
248 | ||
1da177e4 LT |
249 | /******************************************************************************* |
250 | * | |
251 | * FUNCTION: acpi_ds_result_stack_pop | |
252 | * | |
253 | * PARAMETERS: walk_state - Current Walk state | |
254 | * | |
255 | * RETURN: Status | |
256 | * | |
773069d4 | 257 | * DESCRIPTION: Pop an object off of the walk_state result stack |
1da177e4 LT |
258 | * |
259 | ******************************************************************************/ | |
260 | ||
773069d4 | 261 | static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state) |
1da177e4 | 262 | { |
4be44fcd | 263 | union acpi_generic_state *state; |
1da177e4 | 264 | |
b229cf92 | 265 | ACPI_FUNCTION_NAME(ds_result_stack_pop); |
1da177e4 LT |
266 | |
267 | /* Check for stack underflow */ | |
268 | ||
269 | if (walk_state->results == NULL) { | |
773069d4 BM |
270 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
271 | "Result stack underflow - State=%p\n", | |
4be44fcd | 272 | walk_state)); |
1da177e4 LT |
273 | return (AE_AML_NO_OPERAND); |
274 | } | |
275 | ||
773069d4 BM |
276 | if (walk_state->result_size < ACPI_RESULTS_FRAME_OBJ_NUM) { |
277 | ACPI_ERROR((AE_INFO, "Insufficient result stack size")); | |
278 | return (AE_AML_INTERNAL); | |
279 | } | |
280 | ||
4be44fcd | 281 | state = acpi_ut_pop_generic_state(&walk_state->results); |
773069d4 BM |
282 | acpi_ut_delete_generic_state(state); |
283 | ||
284 | /* Decrease the length of result stack by the length of frame */ | |
285 | ||
286 | walk_state->result_size -= ACPI_RESULTS_FRAME_OBJ_NUM; | |
1da177e4 | 287 | |
4be44fcd | 288 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
b229cf92 | 289 | "Result=%p RemainingResults=%X State=%p\n", |
773069d4 | 290 | state, walk_state->result_count, walk_state)); |
1da177e4 LT |
291 | |
292 | return (AE_OK); | |
293 | } | |
294 | ||
1da177e4 LT |
295 | /******************************************************************************* |
296 | * | |
297 | * FUNCTION: acpi_ds_obj_stack_push | |
298 | * | |
ba494bee | 299 | * PARAMETERS: object - Object to push |
1da177e4 LT |
300 | * walk_state - Current Walk state |
301 | * | |
302 | * RETURN: Status | |
303 | * | |
304 | * DESCRIPTION: Push an object onto this walk's object/operand stack | |
305 | * | |
306 | ******************************************************************************/ | |
307 | ||
308 | acpi_status | |
4be44fcd | 309 | acpi_ds_obj_stack_push(void *object, struct acpi_walk_state * walk_state) |
1da177e4 | 310 | { |
b229cf92 | 311 | ACPI_FUNCTION_NAME(ds_obj_stack_push); |
1da177e4 LT |
312 | |
313 | /* Check for stack overflow */ | |
314 | ||
315 | if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) { | |
b8e4d893 | 316 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 317 | "Object stack overflow! Obj=%p State=%p #Ops=%u", |
b8e4d893 | 318 | object, walk_state, walk_state->num_operands)); |
1da177e4 LT |
319 | return (AE_STACK_OVERFLOW); |
320 | } | |
321 | ||
322 | /* Put the object onto the stack */ | |
323 | ||
773069d4 | 324 | walk_state->operands[walk_state->operand_index] = object; |
1da177e4 LT |
325 | walk_state->num_operands++; |
326 | ||
773069d4 BM |
327 | /* For the usual order of filling the operand stack */ |
328 | ||
329 | walk_state->operand_index++; | |
330 | ||
4be44fcd LB |
331 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n", |
332 | object, | |
333 | acpi_ut_get_object_type_name((union | |
334 | acpi_operand_object *) | |
335 | object), walk_state, | |
336 | walk_state->num_operands)); | |
1da177e4 LT |
337 | |
338 | return (AE_OK); | |
339 | } | |
340 | ||
1da177e4 LT |
341 | /******************************************************************************* |
342 | * | |
343 | * FUNCTION: acpi_ds_obj_stack_pop | |
344 | * | |
345 | * PARAMETERS: pop_count - Number of objects/entries to pop | |
346 | * walk_state - Current Walk state | |
347 | * | |
348 | * RETURN: Status | |
349 | * | |
350 | * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT | |
351 | * deleted by this routine. | |
352 | * | |
353 | ******************************************************************************/ | |
354 | ||
355 | acpi_status | |
4be44fcd | 356 | acpi_ds_obj_stack_pop(u32 pop_count, struct acpi_walk_state * walk_state) |
1da177e4 | 357 | { |
4be44fcd | 358 | u32 i; |
1da177e4 | 359 | |
b229cf92 | 360 | ACPI_FUNCTION_NAME(ds_obj_stack_pop); |
1da177e4 LT |
361 | |
362 | for (i = 0; i < pop_count; i++) { | |
52fc0b02 | 363 | |
1da177e4 LT |
364 | /* Check for stack underflow */ |
365 | ||
366 | if (walk_state->num_operands == 0) { | |
b8e4d893 | 367 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 368 | "Object stack underflow! Count=%X State=%p #Ops=%u", |
b8e4d893 BM |
369 | pop_count, walk_state, |
370 | walk_state->num_operands)); | |
1da177e4 LT |
371 | return (AE_STACK_UNDERFLOW); |
372 | } | |
373 | ||
374 | /* Just set the stack entry to null */ | |
375 | ||
376 | walk_state->num_operands--; | |
4be44fcd | 377 | walk_state->operands[walk_state->num_operands] = NULL; |
1da177e4 LT |
378 | } |
379 | ||
f6a22b0b | 380 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%u\n", |
1da177e4 LT |
381 | pop_count, walk_state, walk_state->num_operands)); |
382 | ||
383 | return (AE_OK); | |
384 | } | |
385 | ||
1da177e4 LT |
386 | /******************************************************************************* |
387 | * | |
388 | * FUNCTION: acpi_ds_obj_stack_pop_and_delete | |
389 | * | |
390 | * PARAMETERS: pop_count - Number of objects/entries to pop | |
391 | * walk_state - Current Walk state | |
392 | * | |
393 | * RETURN: Status | |
394 | * | |
395 | * DESCRIPTION: Pop this walk's object stack and delete each object that is | |
396 | * popped off. | |
397 | * | |
398 | ******************************************************************************/ | |
399 | ||
773069d4 | 400 | void |
4be44fcd | 401 | acpi_ds_obj_stack_pop_and_delete(u32 pop_count, |
773069d4 | 402 | struct acpi_walk_state *walk_state) |
1da177e4 | 403 | { |
67a119f9 | 404 | s32 i; |
4be44fcd | 405 | union acpi_operand_object *obj_desc; |
1da177e4 | 406 | |
b229cf92 | 407 | ACPI_FUNCTION_NAME(ds_obj_stack_pop_and_delete); |
1da177e4 | 408 | |
773069d4 BM |
409 | if (pop_count == 0) { |
410 | return; | |
411 | } | |
1da177e4 | 412 | |
67a119f9 | 413 | for (i = (s32) pop_count - 1; i >= 0; i--) { |
1da177e4 | 414 | if (walk_state->num_operands == 0) { |
773069d4 | 415 | return; |
1da177e4 LT |
416 | } |
417 | ||
418 | /* Pop the stack and delete an object if present in this stack entry */ | |
419 | ||
420 | walk_state->num_operands--; | |
773069d4 | 421 | obj_desc = walk_state->operands[i]; |
1da177e4 | 422 | if (obj_desc) { |
773069d4 BM |
423 | acpi_ut_remove_reference(walk_state->operands[i]); |
424 | walk_state->operands[i] = NULL; | |
1da177e4 LT |
425 | } |
426 | } | |
427 | ||
4be44fcd | 428 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n", |
1da177e4 | 429 | pop_count, walk_state, walk_state->num_operands)); |
1da177e4 LT |
430 | } |
431 | ||
1da177e4 LT |
432 | /******************************************************************************* |
433 | * | |
434 | * FUNCTION: acpi_ds_get_current_walk_state | |
435 | * | |
ba494bee | 436 | * PARAMETERS: thread - Get current active state for this Thread |
1da177e4 LT |
437 | * |
438 | * RETURN: Pointer to the current walk state | |
439 | * | |
440 | * DESCRIPTION: Get the walk state that is at the head of the list (the "current" | |
441 | * walk state.) | |
442 | * | |
443 | ******************************************************************************/ | |
444 | ||
4be44fcd LB |
445 | struct acpi_walk_state *acpi_ds_get_current_walk_state(struct acpi_thread_state |
446 | *thread) | |
1da177e4 | 447 | { |
b229cf92 | 448 | ACPI_FUNCTION_NAME(ds_get_current_walk_state); |
1da177e4 LT |
449 | |
450 | if (!thread) { | |
451 | return (NULL); | |
452 | } | |
453 | ||
b229cf92 | 454 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Current WalkState %p\n", |
4be44fcd | 455 | thread->walk_state_list)); |
1da177e4 LT |
456 | |
457 | return (thread->walk_state_list); | |
458 | } | |
459 | ||
1da177e4 LT |
460 | /******************************************************************************* |
461 | * | |
462 | * FUNCTION: acpi_ds_push_walk_state | |
463 | * | |
464 | * PARAMETERS: walk_state - State to push | |
ba494bee | 465 | * thread - Thread state object |
1da177e4 LT |
466 | * |
467 | * RETURN: None | |
468 | * | |
773069d4 | 469 | * DESCRIPTION: Place the Thread state at the head of the state list |
1da177e4 LT |
470 | * |
471 | ******************************************************************************/ | |
472 | ||
473 | void | |
4be44fcd LB |
474 | acpi_ds_push_walk_state(struct acpi_walk_state *walk_state, |
475 | struct acpi_thread_state *thread) | |
1da177e4 | 476 | { |
b229cf92 | 477 | ACPI_FUNCTION_TRACE(ds_push_walk_state); |
1da177e4 | 478 | |
4be44fcd | 479 | walk_state->next = thread->walk_state_list; |
1da177e4 LT |
480 | thread->walk_state_list = walk_state; |
481 | ||
482 | return_VOID; | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /******************************************************************************* |
486 | * | |
487 | * FUNCTION: acpi_ds_pop_walk_state | |
488 | * | |
ba494bee | 489 | * PARAMETERS: thread - Current thread state |
1da177e4 | 490 | * |
44f6c012 | 491 | * RETURN: A walk_state object popped from the thread's stack |
1da177e4 LT |
492 | * |
493 | * DESCRIPTION: Remove and return the walkstate object that is at the head of | |
494 | * the walk stack for the given walk list. NULL indicates that | |
495 | * the list is empty. | |
496 | * | |
497 | ******************************************************************************/ | |
498 | ||
4be44fcd | 499 | struct acpi_walk_state *acpi_ds_pop_walk_state(struct acpi_thread_state *thread) |
1da177e4 | 500 | { |
4be44fcd | 501 | struct acpi_walk_state *walk_state; |
1da177e4 | 502 | |
b229cf92 | 503 | ACPI_FUNCTION_TRACE(ds_pop_walk_state); |
1da177e4 LT |
504 | |
505 | walk_state = thread->walk_state_list; | |
506 | ||
507 | if (walk_state) { | |
52fc0b02 | 508 | |
1da177e4 LT |
509 | /* Next walk state becomes the current walk state */ |
510 | ||
511 | thread->walk_state_list = walk_state->next; | |
512 | ||
513 | /* | |
514 | * Don't clear the NEXT field, this serves as an indicator | |
515 | * that there is a parent WALK STATE | |
44f6c012 | 516 | * Do Not: walk_state->Next = NULL; |
1da177e4 LT |
517 | */ |
518 | } | |
519 | ||
4be44fcd | 520 | return_PTR(walk_state); |
1da177e4 LT |
521 | } |
522 | ||
1da177e4 LT |
523 | /******************************************************************************* |
524 | * | |
525 | * FUNCTION: acpi_ds_create_walk_state | |
526 | * | |
44f6c012 | 527 | * PARAMETERS: owner_id - ID for object creation |
ba494bee | 528 | * origin - Starting point for this walk |
61686124 | 529 | * method_desc - Method object |
ba494bee | 530 | * thread - Current thread state |
1da177e4 LT |
531 | * |
532 | * RETURN: Pointer to the new walk state. | |
533 | * | |
534 | * DESCRIPTION: Allocate and initialize a new walk state. The current walk | |
535 | * state is set to this new state. | |
536 | * | |
537 | ******************************************************************************/ | |
538 | ||
fd350943 LB |
539 | struct acpi_walk_state *acpi_ds_create_walk_state(acpi_owner_id owner_id, union acpi_parse_object |
540 | *origin, union acpi_operand_object | |
541 | *method_desc, struct acpi_thread_state | |
4be44fcd | 542 | *thread) |
1da177e4 | 543 | { |
4be44fcd | 544 | struct acpi_walk_state *walk_state; |
1da177e4 | 545 | |
b229cf92 | 546 | ACPI_FUNCTION_TRACE(ds_create_walk_state); |
1da177e4 | 547 | |
8313524a | 548 | walk_state = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_walk_state)); |
1da177e4 | 549 | if (!walk_state) { |
4be44fcd | 550 | return_PTR(NULL); |
1da177e4 LT |
551 | } |
552 | ||
61686124 BM |
553 | walk_state->descriptor_type = ACPI_DESC_TYPE_WALK; |
554 | walk_state->method_desc = method_desc; | |
4be44fcd LB |
555 | walk_state->owner_id = owner_id; |
556 | walk_state->origin = origin; | |
4be44fcd | 557 | walk_state->thread = thread; |
1da177e4 LT |
558 | |
559 | walk_state->parser_state.start_op = origin; | |
560 | ||
561 | /* Init the method args/local */ | |
562 | ||
563 | #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) | |
4be44fcd | 564 | acpi_ds_method_data_init(walk_state); |
1da177e4 LT |
565 | #endif |
566 | ||
1da177e4 LT |
567 | /* Put the new state at the head of the walk list */ |
568 | ||
569 | if (thread) { | |
4be44fcd | 570 | acpi_ds_push_walk_state(walk_state, thread); |
1da177e4 LT |
571 | } |
572 | ||
4be44fcd | 573 | return_PTR(walk_state); |
1da177e4 LT |
574 | } |
575 | ||
1da177e4 LT |
576 | /******************************************************************************* |
577 | * | |
578 | * FUNCTION: acpi_ds_init_aml_walk | |
579 | * | |
580 | * PARAMETERS: walk_state - New state to be initialized | |
ba494bee | 581 | * op - Current parse op |
1da177e4 LT |
582 | * method_node - Control method NS node, if any |
583 | * aml_start - Start of AML | |
584 | * aml_length - Length of AML | |
ba494bee | 585 | * info - Method info block (params, etc.) |
1da177e4 LT |
586 | * pass_number - 1, 2, or 3 |
587 | * | |
588 | * RETURN: Status | |
589 | * | |
590 | * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk | |
591 | * | |
592 | ******************************************************************************/ | |
593 | ||
594 | acpi_status | |
4be44fcd LB |
595 | acpi_ds_init_aml_walk(struct acpi_walk_state *walk_state, |
596 | union acpi_parse_object *op, | |
597 | struct acpi_namespace_node *method_node, | |
598 | u8 * aml_start, | |
599 | u32 aml_length, | |
4119532c | 600 | struct acpi_evaluate_info *info, u8 pass_number) |
1da177e4 | 601 | { |
4be44fcd LB |
602 | acpi_status status; |
603 | struct acpi_parse_state *parser_state = &walk_state->parser_state; | |
604 | union acpi_parse_object *extra_op; | |
1da177e4 | 605 | |
b229cf92 | 606 | ACPI_FUNCTION_TRACE(ds_init_aml_walk); |
1da177e4 | 607 | |
4be44fcd LB |
608 | walk_state->parser_state.aml = |
609 | walk_state->parser_state.aml_start = aml_start; | |
1da177e4 | 610 | walk_state->parser_state.aml_end = |
4be44fcd | 611 | walk_state->parser_state.pkg_end = aml_start + aml_length; |
1da177e4 LT |
612 | |
613 | /* The next_op of the next_walk will be the beginning of the method */ | |
614 | ||
44f6c012 | 615 | walk_state->next_op = NULL; |
0c9938cc | 616 | walk_state->pass_number = pass_number; |
1da177e4 LT |
617 | |
618 | if (info) { | |
c91d924e BM |
619 | walk_state->params = info->parameters; |
620 | walk_state->caller_return_desc = &info->return_object; | |
1da177e4 LT |
621 | } |
622 | ||
4be44fcd LB |
623 | status = acpi_ps_init_scope(&walk_state->parser_state, op); |
624 | if (ACPI_FAILURE(status)) { | |
625 | return_ACPI_STATUS(status); | |
1da177e4 LT |
626 | } |
627 | ||
628 | if (method_node) { | |
629 | walk_state->parser_state.start_node = method_node; | |
4be44fcd LB |
630 | walk_state->walk_type = ACPI_WALK_METHOD; |
631 | walk_state->method_node = method_node; | |
632 | walk_state->method_desc = | |
633 | acpi_ns_get_attached_object(method_node); | |
1da177e4 LT |
634 | |
635 | /* Push start scope on scope stack and make it current */ | |
636 | ||
4be44fcd LB |
637 | status = |
638 | acpi_ds_scope_stack_push(method_node, ACPI_TYPE_METHOD, | |
639 | walk_state); | |
640 | if (ACPI_FAILURE(status)) { | |
641 | return_ACPI_STATUS(status); | |
1da177e4 LT |
642 | } |
643 | ||
644 | /* Init the method arguments */ | |
645 | ||
4be44fcd LB |
646 | status = acpi_ds_method_data_init_args(walk_state->params, |
647 | ACPI_METHOD_NUM_ARGS, | |
648 | walk_state); | |
649 | if (ACPI_FAILURE(status)) { | |
650 | return_ACPI_STATUS(status); | |
1da177e4 | 651 | } |
4be44fcd | 652 | } else { |
1da177e4 LT |
653 | /* |
654 | * Setup the current scope. | |
655 | * Find a Named Op that has a namespace node associated with it. | |
656 | * search upwards from this Op. Current scope is the first | |
657 | * Op with a namespace node. | |
658 | */ | |
659 | extra_op = parser_state->start_op; | |
660 | while (extra_op && !extra_op->common.node) { | |
661 | extra_op = extra_op->common.parent; | |
662 | } | |
663 | ||
664 | if (!extra_op) { | |
665 | parser_state->start_node = NULL; | |
4be44fcd | 666 | } else { |
1da177e4 LT |
667 | parser_state->start_node = extra_op->common.node; |
668 | } | |
669 | ||
670 | if (parser_state->start_node) { | |
52fc0b02 | 671 | |
1da177e4 LT |
672 | /* Push start scope on scope stack and make it current */ |
673 | ||
4be44fcd LB |
674 | status = |
675 | acpi_ds_scope_stack_push(parser_state->start_node, | |
676 | parser_state->start_node-> | |
677 | type, walk_state); | |
678 | if (ACPI_FAILURE(status)) { | |
679 | return_ACPI_STATUS(status); | |
1da177e4 LT |
680 | } |
681 | } | |
682 | } | |
683 | ||
4be44fcd LB |
684 | status = acpi_ds_init_callbacks(walk_state, pass_number); |
685 | return_ACPI_STATUS(status); | |
1da177e4 LT |
686 | } |
687 | ||
1da177e4 LT |
688 | /******************************************************************************* |
689 | * | |
690 | * FUNCTION: acpi_ds_delete_walk_state | |
691 | * | |
692 | * PARAMETERS: walk_state - State to delete | |
693 | * | |
694 | * RETURN: Status | |
695 | * | |
696 | * DESCRIPTION: Delete a walk state including all internal data structures | |
697 | * | |
698 | ******************************************************************************/ | |
699 | ||
4be44fcd | 700 | void acpi_ds_delete_walk_state(struct acpi_walk_state *walk_state) |
1da177e4 | 701 | { |
4be44fcd | 702 | union acpi_generic_state *state; |
1da177e4 | 703 | |
b229cf92 | 704 | ACPI_FUNCTION_TRACE_PTR(ds_delete_walk_state, walk_state); |
1da177e4 LT |
705 | |
706 | if (!walk_state) { | |
707 | return; | |
708 | } | |
709 | ||
61686124 | 710 | if (walk_state->descriptor_type != ACPI_DESC_TYPE_WALK) { |
b8e4d893 BM |
711 | ACPI_ERROR((AE_INFO, "%p is not a valid walk state", |
712 | walk_state)); | |
1da177e4 LT |
713 | return; |
714 | } | |
715 | ||
4119532c BM |
716 | /* There should not be any open scopes */ |
717 | ||
1da177e4 | 718 | if (walk_state->parser_state.scope) { |
b8e4d893 BM |
719 | ACPI_ERROR((AE_INFO, "%p walk still has a scope list", |
720 | walk_state)); | |
4119532c | 721 | acpi_ps_cleanup_scope(&walk_state->parser_state); |
1da177e4 LT |
722 | } |
723 | ||
724 | /* Always must free any linked control states */ | |
725 | ||
726 | while (walk_state->control_state) { | |
727 | state = walk_state->control_state; | |
728 | walk_state->control_state = state->common.next; | |
729 | ||
4be44fcd | 730 | acpi_ut_delete_generic_state(state); |
1da177e4 LT |
731 | } |
732 | ||
733 | /* Always must free any linked parse states */ | |
734 | ||
735 | while (walk_state->scope_info) { | |
736 | state = walk_state->scope_info; | |
737 | walk_state->scope_info = state->common.next; | |
738 | ||
4be44fcd | 739 | acpi_ut_delete_generic_state(state); |
1da177e4 LT |
740 | } |
741 | ||
742 | /* Always must free any stacked result states */ | |
743 | ||
744 | while (walk_state->results) { | |
745 | state = walk_state->results; | |
746 | walk_state->results = state->common.next; | |
747 | ||
4be44fcd | 748 | acpi_ut_delete_generic_state(state); |
1da177e4 LT |
749 | } |
750 | ||
8313524a | 751 | ACPI_FREE(walk_state); |
1da177e4 LT |
752 | return_VOID; |
753 | } |