Commit | Line | Data |
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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 | 53 | /* Local prototypes */ |
1f86e8c1 LZ |
54 | static acpi_status |
55 | acpi_ds_result_stack_push(struct acpi_walk_state *walk_state); | |
56 | static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state); | |
1da177e4 | 57 | |
1da177e4 LT |
58 | /******************************************************************************* |
59 | * | |
60 | * FUNCTION: acpi_ds_result_pop | |
61 | * | |
ba494bee | 62 | * PARAMETERS: object - Where to return the popped object |
1da177e4 LT |
63 | * walk_state - Current Walk state |
64 | * | |
65 | * RETURN: Status | |
66 | * | |
773069d4 | 67 | * DESCRIPTION: Pop an object off the top of this walk's result stack |
1da177e4 LT |
68 | * |
69 | ******************************************************************************/ | |
70 | ||
71 | acpi_status | |
773069d4 BM |
72 | acpi_ds_result_pop(union acpi_operand_object **object, |
73 | struct acpi_walk_state *walk_state) | |
1da177e4 | 74 | { |
67a119f9 | 75 | u32 index; |
4be44fcd | 76 | union acpi_generic_state *state; |
773069d4 | 77 | acpi_status status; |
1da177e4 | 78 | |
b229cf92 | 79 | ACPI_FUNCTION_NAME(ds_result_pop); |
1da177e4 LT |
80 | |
81 | state = walk_state->results; | |
1da177e4 | 82 | |
773069d4 | 83 | /* Incorrect state of result stack */ |
1da177e4 | 84 | |
773069d4 BM |
85 | if (state && !walk_state->result_count) { |
86 | ACPI_ERROR((AE_INFO, "No results on result stack")); | |
87 | return (AE_AML_INTERNAL); | |
1da177e4 LT |
88 | } |
89 | ||
773069d4 BM |
90 | if (!state && walk_state->result_count) { |
91 | ACPI_ERROR((AE_INFO, "No result state for result stack")); | |
92 | return (AE_AML_INTERNAL); | |
93 | } | |
1da177e4 | 94 | |
773069d4 | 95 | /* Empty result stack */ |
1da177e4 | 96 | |
1da177e4 | 97 | if (!state) { |
773069d4 | 98 | ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p", |
b8e4d893 | 99 | walk_state)); |
1da177e4 LT |
100 | return (AE_AML_NO_RETURN_VALUE); |
101 | } | |
102 | ||
773069d4 | 103 | /* Return object of the top element and clean that top element result stack */ |
1da177e4 | 104 | |
773069d4 | 105 | walk_state->result_count--; |
ba9c3f55 | 106 | index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM; |
1da177e4 | 107 | |
773069d4 | 108 | *object = state->results.obj_desc[index]; |
1da177e4 | 109 | if (!*object) { |
b8e4d893 | 110 | ACPI_ERROR((AE_INFO, |
773069d4 BM |
111 | "No result objects on result stack, State=%p", |
112 | walk_state)); | |
1da177e4 LT |
113 | return (AE_AML_NO_RETURN_VALUE); |
114 | } | |
115 | ||
773069d4 BM |
116 | state->results.obj_desc[index] = NULL; |
117 | if (index == 0) { | |
118 | status = acpi_ds_result_stack_pop(walk_state); | |
119 | if (ACPI_FAILURE(status)) { | |
120 | return (status); | |
121 | } | |
122 | } | |
123 | ||
124 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
125 | "Obj=%p [%s] Index=%X State=%p Num=%X\n", *object, | |
126 | acpi_ut_get_object_type_name(*object), | |
67a119f9 | 127 | index, walk_state, walk_state->result_count)); |
1da177e4 LT |
128 | |
129 | return (AE_OK); | |
130 | } | |
131 | ||
1da177e4 LT |
132 | /******************************************************************************* |
133 | * | |
134 | * FUNCTION: acpi_ds_result_push | |
135 | * | |
ba494bee | 136 | * PARAMETERS: object - Where to return the popped object |
1da177e4 LT |
137 | * walk_state - Current Walk state |
138 | * | |
139 | * RETURN: Status | |
140 | * | |
141 | * DESCRIPTION: Push an object onto the current result stack | |
142 | * | |
143 | ******************************************************************************/ | |
144 | ||
145 | acpi_status | |
4be44fcd LB |
146 | acpi_ds_result_push(union acpi_operand_object * object, |
147 | struct acpi_walk_state * walk_state) | |
1da177e4 | 148 | { |
4be44fcd | 149 | union acpi_generic_state *state; |
773069d4 | 150 | acpi_status status; |
67a119f9 | 151 | u32 index; |
1da177e4 | 152 | |
b229cf92 | 153 | ACPI_FUNCTION_NAME(ds_result_push); |
1da177e4 | 154 | |
773069d4 BM |
155 | if (walk_state->result_count > walk_state->result_size) { |
156 | ACPI_ERROR((AE_INFO, "Result stack is full")); | |
157 | return (AE_AML_INTERNAL); | |
158 | } else if (walk_state->result_count == walk_state->result_size) { | |
159 | ||
160 | /* Extend the result stack */ | |
161 | ||
162 | status = acpi_ds_result_stack_push(walk_state); | |
163 | if (ACPI_FAILURE(status)) { | |
164 | ACPI_ERROR((AE_INFO, | |
165 | "Failed to extend the result stack")); | |
166 | return (status); | |
167 | } | |
168 | } | |
169 | ||
170 | if (!(walk_state->result_count < walk_state->result_size)) { | |
171 | ACPI_ERROR((AE_INFO, "No free elements in result stack")); | |
172 | return (AE_AML_INTERNAL); | |
173 | } | |
174 | ||
1da177e4 LT |
175 | state = walk_state->results; |
176 | if (!state) { | |
b8e4d893 | 177 | ACPI_ERROR((AE_INFO, "No result stack frame during push")); |
1da177e4 LT |
178 | return (AE_AML_INTERNAL); |
179 | } | |
180 | ||
1da177e4 | 181 | if (!object) { |
b8e4d893 | 182 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 183 | "Null Object! Obj=%p State=%p Num=%u", |
773069d4 | 184 | object, walk_state, walk_state->result_count)); |
1da177e4 LT |
185 | return (AE_BAD_PARAMETER); |
186 | } | |
187 | ||
773069d4 BM |
188 | /* Assign the address of object to the top free element of result stack */ |
189 | ||
ba9c3f55 | 190 | index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM; |
773069d4 BM |
191 | state->results.obj_desc[index] = object; |
192 | walk_state->result_count++; | |
1da177e4 | 193 | |
4be44fcd LB |
194 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n", |
195 | object, | |
4be44fcd LB |
196 | acpi_ut_get_object_type_name((union |
197 | acpi_operand_object *) | |
773069d4 BM |
198 | object), walk_state, |
199 | walk_state->result_count, | |
4be44fcd | 200 | walk_state->current_result)); |
1da177e4 LT |
201 | |
202 | return (AE_OK); | |
203 | } | |
204 | ||
1da177e4 LT |
205 | /******************************************************************************* |
206 | * | |
207 | * FUNCTION: acpi_ds_result_stack_push | |
208 | * | |
209 | * PARAMETERS: walk_state - Current Walk state | |
210 | * | |
211 | * RETURN: Status | |
212 | * | |
773069d4 | 213 | * DESCRIPTION: Push an object onto the walk_state result stack |
1da177e4 LT |
214 | * |
215 | ******************************************************************************/ | |
216 | ||
773069d4 | 217 | static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *walk_state) |
1da177e4 | 218 | { |
4be44fcd | 219 | union acpi_generic_state *state; |
1da177e4 | 220 | |
b229cf92 | 221 | ACPI_FUNCTION_NAME(ds_result_stack_push); |
1da177e4 | 222 | |
773069d4 BM |
223 | /* Check for stack overflow */ |
224 | ||
b7f9f042 | 225 | if (((u32) walk_state->result_size + ACPI_RESULTS_FRAME_OBJ_NUM) > |
773069d4 | 226 | ACPI_RESULTS_OBJ_NUM_MAX) { |
f6a22b0b | 227 | ACPI_ERROR((AE_INFO, "Result stack overflow: State=%p Num=%u", |
773069d4 BM |
228 | walk_state, walk_state->result_size)); |
229 | return (AE_STACK_OVERFLOW); | |
230 | } | |
231 | ||
4be44fcd | 232 | state = acpi_ut_create_generic_state(); |
1da177e4 LT |
233 | if (!state) { |
234 | return (AE_NO_MEMORY); | |
235 | } | |
236 | ||
61686124 | 237 | state->common.descriptor_type = ACPI_DESC_TYPE_STATE_RESULT; |
4be44fcd | 238 | acpi_ut_push_generic_state(&walk_state->results, state); |
1da177e4 | 239 | |
773069d4 BM |
240 | /* Increase the length of the result stack by the length of frame */ |
241 | ||
242 | walk_state->result_size += ACPI_RESULTS_FRAME_OBJ_NUM; | |
243 | ||
4be44fcd LB |
244 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n", |
245 | state, walk_state)); | |
1da177e4 LT |
246 | |
247 | return (AE_OK); | |
248 | } | |
249 | ||
1da177e4 LT |
250 | /******************************************************************************* |
251 | * | |
252 | * FUNCTION: acpi_ds_result_stack_pop | |
253 | * | |
254 | * PARAMETERS: walk_state - Current Walk state | |
255 | * | |
256 | * RETURN: Status | |
257 | * | |
773069d4 | 258 | * DESCRIPTION: Pop an object off of the walk_state result stack |
1da177e4 LT |
259 | * |
260 | ******************************************************************************/ | |
261 | ||
773069d4 | 262 | static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state) |
1da177e4 | 263 | { |
4be44fcd | 264 | union acpi_generic_state *state; |
1da177e4 | 265 | |
b229cf92 | 266 | ACPI_FUNCTION_NAME(ds_result_stack_pop); |
1da177e4 LT |
267 | |
268 | /* Check for stack underflow */ | |
269 | ||
270 | if (walk_state->results == NULL) { | |
773069d4 BM |
271 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
272 | "Result stack underflow - State=%p\n", | |
4be44fcd | 273 | walk_state)); |
1da177e4 LT |
274 | return (AE_AML_NO_OPERAND); |
275 | } | |
276 | ||
773069d4 BM |
277 | if (walk_state->result_size < ACPI_RESULTS_FRAME_OBJ_NUM) { |
278 | ACPI_ERROR((AE_INFO, "Insufficient result stack size")); | |
279 | return (AE_AML_INTERNAL); | |
280 | } | |
281 | ||
4be44fcd | 282 | state = acpi_ut_pop_generic_state(&walk_state->results); |
773069d4 BM |
283 | acpi_ut_delete_generic_state(state); |
284 | ||
285 | /* Decrease the length of result stack by the length of frame */ | |
286 | ||
287 | walk_state->result_size -= ACPI_RESULTS_FRAME_OBJ_NUM; | |
1da177e4 | 288 | |
4be44fcd | 289 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
b229cf92 | 290 | "Result=%p RemainingResults=%X State=%p\n", |
773069d4 | 291 | state, walk_state->result_count, walk_state)); |
1da177e4 LT |
292 | |
293 | return (AE_OK); | |
294 | } | |
295 | ||
1da177e4 LT |
296 | /******************************************************************************* |
297 | * | |
298 | * FUNCTION: acpi_ds_obj_stack_push | |
299 | * | |
ba494bee | 300 | * PARAMETERS: object - Object to push |
1da177e4 LT |
301 | * walk_state - Current Walk state |
302 | * | |
303 | * RETURN: Status | |
304 | * | |
305 | * DESCRIPTION: Push an object onto this walk's object/operand stack | |
306 | * | |
307 | ******************************************************************************/ | |
308 | ||
309 | acpi_status | |
4be44fcd | 310 | acpi_ds_obj_stack_push(void *object, struct acpi_walk_state * walk_state) |
1da177e4 | 311 | { |
b229cf92 | 312 | ACPI_FUNCTION_NAME(ds_obj_stack_push); |
1da177e4 LT |
313 | |
314 | /* Check for stack overflow */ | |
315 | ||
316 | if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) { | |
b8e4d893 | 317 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 318 | "Object stack overflow! Obj=%p State=%p #Ops=%u", |
b8e4d893 | 319 | object, walk_state, walk_state->num_operands)); |
1da177e4 LT |
320 | return (AE_STACK_OVERFLOW); |
321 | } | |
322 | ||
323 | /* Put the object onto the stack */ | |
324 | ||
773069d4 | 325 | walk_state->operands[walk_state->operand_index] = object; |
1da177e4 LT |
326 | walk_state->num_operands++; |
327 | ||
773069d4 BM |
328 | /* For the usual order of filling the operand stack */ |
329 | ||
330 | walk_state->operand_index++; | |
331 | ||
4be44fcd LB |
332 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n", |
333 | object, | |
334 | acpi_ut_get_object_type_name((union | |
335 | acpi_operand_object *) | |
336 | object), walk_state, | |
337 | walk_state->num_operands)); | |
1da177e4 LT |
338 | |
339 | return (AE_OK); | |
340 | } | |
341 | ||
1da177e4 LT |
342 | /******************************************************************************* |
343 | * | |
344 | * FUNCTION: acpi_ds_obj_stack_pop | |
345 | * | |
346 | * PARAMETERS: pop_count - Number of objects/entries to pop | |
347 | * walk_state - Current Walk state | |
348 | * | |
349 | * RETURN: Status | |
350 | * | |
73a3090a | 351 | * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT |
1da177e4 LT |
352 | * deleted by this routine. |
353 | * | |
354 | ******************************************************************************/ | |
355 | ||
356 | acpi_status | |
4be44fcd | 357 | acpi_ds_obj_stack_pop(u32 pop_count, struct acpi_walk_state * walk_state) |
1da177e4 | 358 | { |
4be44fcd | 359 | u32 i; |
1da177e4 | 360 | |
b229cf92 | 361 | ACPI_FUNCTION_NAME(ds_obj_stack_pop); |
1da177e4 LT |
362 | |
363 | for (i = 0; i < pop_count; i++) { | |
52fc0b02 | 364 | |
1da177e4 LT |
365 | /* Check for stack underflow */ |
366 | ||
367 | if (walk_state->num_operands == 0) { | |
b8e4d893 | 368 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 369 | "Object stack underflow! Count=%X State=%p #Ops=%u", |
b8e4d893 BM |
370 | pop_count, walk_state, |
371 | walk_state->num_operands)); | |
1da177e4 LT |
372 | return (AE_STACK_UNDERFLOW); |
373 | } | |
374 | ||
375 | /* Just set the stack entry to null */ | |
376 | ||
377 | walk_state->num_operands--; | |
4be44fcd | 378 | walk_state->operands[walk_state->num_operands] = NULL; |
1da177e4 LT |
379 | } |
380 | ||
f6a22b0b | 381 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%u\n", |
1da177e4 LT |
382 | pop_count, walk_state, walk_state->num_operands)); |
383 | ||
384 | return (AE_OK); | |
385 | } | |
386 | ||
1da177e4 LT |
387 | /******************************************************************************* |
388 | * | |
389 | * FUNCTION: acpi_ds_obj_stack_pop_and_delete | |
390 | * | |
391 | * PARAMETERS: pop_count - Number of objects/entries to pop | |
392 | * walk_state - Current Walk state | |
393 | * | |
394 | * RETURN: Status | |
395 | * | |
396 | * DESCRIPTION: Pop this walk's object stack and delete each object that is | |
397 | * popped off. | |
398 | * | |
399 | ******************************************************************************/ | |
400 | ||
773069d4 | 401 | void |
4be44fcd | 402 | acpi_ds_obj_stack_pop_and_delete(u32 pop_count, |
773069d4 | 403 | struct acpi_walk_state *walk_state) |
1da177e4 | 404 | { |
67a119f9 | 405 | s32 i; |
4be44fcd | 406 | union acpi_operand_object *obj_desc; |
1da177e4 | 407 | |
b229cf92 | 408 | ACPI_FUNCTION_NAME(ds_obj_stack_pop_and_delete); |
1da177e4 | 409 | |
773069d4 BM |
410 | if (pop_count == 0) { |
411 | return; | |
412 | } | |
1da177e4 | 413 | |
67a119f9 | 414 | for (i = (s32) pop_count - 1; i >= 0; i--) { |
1da177e4 | 415 | if (walk_state->num_operands == 0) { |
773069d4 | 416 | return; |
1da177e4 LT |
417 | } |
418 | ||
419 | /* Pop the stack and delete an object if present in this stack entry */ | |
420 | ||
421 | walk_state->num_operands--; | |
773069d4 | 422 | obj_desc = walk_state->operands[i]; |
1da177e4 | 423 | if (obj_desc) { |
773069d4 BM |
424 | acpi_ut_remove_reference(walk_state->operands[i]); |
425 | walk_state->operands[i] = NULL; | |
1da177e4 LT |
426 | } |
427 | } | |
428 | ||
4be44fcd | 429 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n", |
1da177e4 | 430 | pop_count, walk_state, walk_state->num_operands)); |
1da177e4 LT |
431 | } |
432 | ||
1da177e4 LT |
433 | /******************************************************************************* |
434 | * | |
435 | * FUNCTION: acpi_ds_get_current_walk_state | |
436 | * | |
ba494bee | 437 | * PARAMETERS: thread - Get current active state for this Thread |
1da177e4 LT |
438 | * |
439 | * RETURN: Pointer to the current walk state | |
440 | * | |
441 | * DESCRIPTION: Get the walk state that is at the head of the list (the "current" | |
442 | * walk state.) | |
443 | * | |
444 | ******************************************************************************/ | |
445 | ||
4be44fcd LB |
446 | struct acpi_walk_state *acpi_ds_get_current_walk_state(struct acpi_thread_state |
447 | *thread) | |
1da177e4 | 448 | { |
b229cf92 | 449 | ACPI_FUNCTION_NAME(ds_get_current_walk_state); |
1da177e4 LT |
450 | |
451 | if (!thread) { | |
452 | return (NULL); | |
453 | } | |
454 | ||
b229cf92 | 455 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Current WalkState %p\n", |
4be44fcd | 456 | thread->walk_state_list)); |
1da177e4 LT |
457 | |
458 | return (thread->walk_state_list); | |
459 | } | |
460 | ||
1da177e4 LT |
461 | /******************************************************************************* |
462 | * | |
463 | * FUNCTION: acpi_ds_push_walk_state | |
464 | * | |
465 | * PARAMETERS: walk_state - State to push | |
ba494bee | 466 | * thread - Thread state object |
1da177e4 LT |
467 | * |
468 | * RETURN: None | |
469 | * | |
773069d4 | 470 | * DESCRIPTION: Place the Thread state at the head of the state list |
1da177e4 LT |
471 | * |
472 | ******************************************************************************/ | |
473 | ||
474 | void | |
4be44fcd LB |
475 | acpi_ds_push_walk_state(struct acpi_walk_state *walk_state, |
476 | struct acpi_thread_state *thread) | |
1da177e4 | 477 | { |
b229cf92 | 478 | ACPI_FUNCTION_TRACE(ds_push_walk_state); |
1da177e4 | 479 | |
4be44fcd | 480 | walk_state->next = thread->walk_state_list; |
1da177e4 LT |
481 | thread->walk_state_list = walk_state; |
482 | ||
483 | return_VOID; | |
484 | } | |
485 | ||
1da177e4 LT |
486 | /******************************************************************************* |
487 | * | |
488 | * FUNCTION: acpi_ds_pop_walk_state | |
489 | * | |
ba494bee | 490 | * PARAMETERS: thread - Current thread state |
1da177e4 | 491 | * |
44f6c012 | 492 | * RETURN: A walk_state object popped from the thread's stack |
1da177e4 LT |
493 | * |
494 | * DESCRIPTION: Remove and return the walkstate object that is at the head of | |
73a3090a | 495 | * the walk stack for the given walk list. NULL indicates that |
1da177e4 LT |
496 | * the list is empty. |
497 | * | |
498 | ******************************************************************************/ | |
499 | ||
4be44fcd | 500 | struct acpi_walk_state *acpi_ds_pop_walk_state(struct acpi_thread_state *thread) |
1da177e4 | 501 | { |
4be44fcd | 502 | struct acpi_walk_state *walk_state; |
1da177e4 | 503 | |
b229cf92 | 504 | ACPI_FUNCTION_TRACE(ds_pop_walk_state); |
1da177e4 LT |
505 | |
506 | walk_state = thread->walk_state_list; | |
507 | ||
508 | if (walk_state) { | |
52fc0b02 | 509 | |
1da177e4 LT |
510 | /* Next walk state becomes the current walk state */ |
511 | ||
512 | thread->walk_state_list = walk_state->next; | |
513 | ||
514 | /* | |
515 | * Don't clear the NEXT field, this serves as an indicator | |
516 | * that there is a parent WALK STATE | |
44f6c012 | 517 | * Do Not: walk_state->Next = NULL; |
1da177e4 LT |
518 | */ |
519 | } | |
520 | ||
4be44fcd | 521 | return_PTR(walk_state); |
1da177e4 LT |
522 | } |
523 | ||
1da177e4 LT |
524 | /******************************************************************************* |
525 | * | |
526 | * FUNCTION: acpi_ds_create_walk_state | |
527 | * | |
44f6c012 | 528 | * PARAMETERS: owner_id - ID for object creation |
ba494bee | 529 | * origin - Starting point for this walk |
61686124 | 530 | * method_desc - Method object |
ba494bee | 531 | * thread - Current thread state |
1da177e4 LT |
532 | * |
533 | * RETURN: Pointer to the new walk state. | |
534 | * | |
73a3090a | 535 | * DESCRIPTION: Allocate and initialize a new walk state. The current walk |
1da177e4 LT |
536 | * state is set to this new state. |
537 | * | |
538 | ******************************************************************************/ | |
539 | ||
1f86e8c1 LZ |
540 | struct acpi_walk_state *acpi_ds_create_walk_state(acpi_owner_id owner_id, |
541 | union acpi_parse_object | |
542 | *origin, | |
543 | union acpi_operand_object | |
544 | *method_desc, | |
545 | struct acpi_thread_state | |
4be44fcd | 546 | *thread) |
1da177e4 | 547 | { |
4be44fcd | 548 | struct acpi_walk_state *walk_state; |
1da177e4 | 549 | |
b229cf92 | 550 | ACPI_FUNCTION_TRACE(ds_create_walk_state); |
1da177e4 | 551 | |
8313524a | 552 | walk_state = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_walk_state)); |
1da177e4 | 553 | if (!walk_state) { |
4be44fcd | 554 | return_PTR(NULL); |
1da177e4 LT |
555 | } |
556 | ||
61686124 BM |
557 | walk_state->descriptor_type = ACPI_DESC_TYPE_WALK; |
558 | walk_state->method_desc = method_desc; | |
4be44fcd LB |
559 | walk_state->owner_id = owner_id; |
560 | walk_state->origin = origin; | |
4be44fcd | 561 | walk_state->thread = thread; |
1da177e4 LT |
562 | |
563 | walk_state->parser_state.start_op = origin; | |
564 | ||
565 | /* Init the method args/local */ | |
566 | ||
567 | #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) | |
4be44fcd | 568 | acpi_ds_method_data_init(walk_state); |
1da177e4 LT |
569 | #endif |
570 | ||
1da177e4 LT |
571 | /* Put the new state at the head of the walk list */ |
572 | ||
573 | if (thread) { | |
4be44fcd | 574 | acpi_ds_push_walk_state(walk_state, thread); |
1da177e4 LT |
575 | } |
576 | ||
4be44fcd | 577 | return_PTR(walk_state); |
1da177e4 LT |
578 | } |
579 | ||
1da177e4 LT |
580 | /******************************************************************************* |
581 | * | |
582 | * FUNCTION: acpi_ds_init_aml_walk | |
583 | * | |
584 | * PARAMETERS: walk_state - New state to be initialized | |
ba494bee | 585 | * op - Current parse op |
1da177e4 LT |
586 | * method_node - Control method NS node, if any |
587 | * aml_start - Start of AML | |
588 | * aml_length - Length of AML | |
ba494bee | 589 | * info - Method info block (params, etc.) |
1da177e4 LT |
590 | * pass_number - 1, 2, or 3 |
591 | * | |
592 | * RETURN: Status | |
593 | * | |
594 | * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk | |
595 | * | |
596 | ******************************************************************************/ | |
597 | ||
598 | acpi_status | |
4be44fcd LB |
599 | acpi_ds_init_aml_walk(struct acpi_walk_state *walk_state, |
600 | union acpi_parse_object *op, | |
601 | struct acpi_namespace_node *method_node, | |
602 | u8 * aml_start, | |
603 | u32 aml_length, | |
4119532c | 604 | struct acpi_evaluate_info *info, u8 pass_number) |
1da177e4 | 605 | { |
4be44fcd LB |
606 | acpi_status status; |
607 | struct acpi_parse_state *parser_state = &walk_state->parser_state; | |
608 | union acpi_parse_object *extra_op; | |
1da177e4 | 609 | |
b229cf92 | 610 | ACPI_FUNCTION_TRACE(ds_init_aml_walk); |
1da177e4 | 611 | |
4be44fcd LB |
612 | walk_state->parser_state.aml = |
613 | walk_state->parser_state.aml_start = aml_start; | |
1da177e4 | 614 | walk_state->parser_state.aml_end = |
4be44fcd | 615 | walk_state->parser_state.pkg_end = aml_start + aml_length; |
1da177e4 LT |
616 | |
617 | /* The next_op of the next_walk will be the beginning of the method */ | |
618 | ||
44f6c012 | 619 | walk_state->next_op = NULL; |
0c9938cc | 620 | walk_state->pass_number = pass_number; |
1da177e4 LT |
621 | |
622 | if (info) { | |
c91d924e BM |
623 | walk_state->params = info->parameters; |
624 | walk_state->caller_return_desc = &info->return_object; | |
1da177e4 LT |
625 | } |
626 | ||
4be44fcd LB |
627 | status = acpi_ps_init_scope(&walk_state->parser_state, op); |
628 | if (ACPI_FAILURE(status)) { | |
629 | return_ACPI_STATUS(status); | |
1da177e4 LT |
630 | } |
631 | ||
632 | if (method_node) { | |
633 | walk_state->parser_state.start_node = method_node; | |
4be44fcd LB |
634 | walk_state->walk_type = ACPI_WALK_METHOD; |
635 | walk_state->method_node = method_node; | |
636 | walk_state->method_desc = | |
637 | acpi_ns_get_attached_object(method_node); | |
1da177e4 LT |
638 | |
639 | /* Push start scope on scope stack and make it current */ | |
640 | ||
4be44fcd LB |
641 | status = |
642 | acpi_ds_scope_stack_push(method_node, ACPI_TYPE_METHOD, | |
643 | walk_state); | |
644 | if (ACPI_FAILURE(status)) { | |
645 | return_ACPI_STATUS(status); | |
1da177e4 LT |
646 | } |
647 | ||
648 | /* Init the method arguments */ | |
649 | ||
4be44fcd LB |
650 | status = acpi_ds_method_data_init_args(walk_state->params, |
651 | ACPI_METHOD_NUM_ARGS, | |
652 | walk_state); | |
653 | if (ACPI_FAILURE(status)) { | |
654 | return_ACPI_STATUS(status); | |
1da177e4 | 655 | } |
4be44fcd | 656 | } else { |
1da177e4 LT |
657 | /* |
658 | * Setup the current scope. | |
659 | * Find a Named Op that has a namespace node associated with it. | |
73a3090a | 660 | * search upwards from this Op. Current scope is the first |
1da177e4 LT |
661 | * Op with a namespace node. |
662 | */ | |
663 | extra_op = parser_state->start_op; | |
664 | while (extra_op && !extra_op->common.node) { | |
665 | extra_op = extra_op->common.parent; | |
666 | } | |
667 | ||
668 | if (!extra_op) { | |
669 | parser_state->start_node = NULL; | |
4be44fcd | 670 | } else { |
1da177e4 LT |
671 | parser_state->start_node = extra_op->common.node; |
672 | } | |
673 | ||
674 | if (parser_state->start_node) { | |
52fc0b02 | 675 | |
1da177e4 LT |
676 | /* Push start scope on scope stack and make it current */ |
677 | ||
4be44fcd LB |
678 | status = |
679 | acpi_ds_scope_stack_push(parser_state->start_node, | |
680 | parser_state->start_node-> | |
681 | type, walk_state); | |
682 | if (ACPI_FAILURE(status)) { | |
683 | return_ACPI_STATUS(status); | |
1da177e4 LT |
684 | } |
685 | } | |
686 | } | |
687 | ||
4be44fcd LB |
688 | status = acpi_ds_init_callbacks(walk_state, pass_number); |
689 | return_ACPI_STATUS(status); | |
1da177e4 LT |
690 | } |
691 | ||
1da177e4 LT |
692 | /******************************************************************************* |
693 | * | |
694 | * FUNCTION: acpi_ds_delete_walk_state | |
695 | * | |
696 | * PARAMETERS: walk_state - State to delete | |
697 | * | |
698 | * RETURN: Status | |
699 | * | |
700 | * DESCRIPTION: Delete a walk state including all internal data structures | |
701 | * | |
702 | ******************************************************************************/ | |
703 | ||
4be44fcd | 704 | void acpi_ds_delete_walk_state(struct acpi_walk_state *walk_state) |
1da177e4 | 705 | { |
4be44fcd | 706 | union acpi_generic_state *state; |
1da177e4 | 707 | |
b229cf92 | 708 | ACPI_FUNCTION_TRACE_PTR(ds_delete_walk_state, walk_state); |
1da177e4 LT |
709 | |
710 | if (!walk_state) { | |
68aafc35 | 711 | return_VOID; |
1da177e4 LT |
712 | } |
713 | ||
61686124 | 714 | if (walk_state->descriptor_type != ACPI_DESC_TYPE_WALK) { |
b8e4d893 BM |
715 | ACPI_ERROR((AE_INFO, "%p is not a valid walk state", |
716 | walk_state)); | |
68aafc35 | 717 | return_VOID; |
1da177e4 LT |
718 | } |
719 | ||
4119532c BM |
720 | /* There should not be any open scopes */ |
721 | ||
1da177e4 | 722 | if (walk_state->parser_state.scope) { |
b8e4d893 BM |
723 | ACPI_ERROR((AE_INFO, "%p walk still has a scope list", |
724 | walk_state)); | |
4119532c | 725 | acpi_ps_cleanup_scope(&walk_state->parser_state); |
1da177e4 LT |
726 | } |
727 | ||
728 | /* Always must free any linked control states */ | |
729 | ||
730 | while (walk_state->control_state) { | |
731 | state = walk_state->control_state; | |
732 | walk_state->control_state = state->common.next; | |
733 | ||
4be44fcd | 734 | acpi_ut_delete_generic_state(state); |
1da177e4 LT |
735 | } |
736 | ||
737 | /* Always must free any linked parse states */ | |
738 | ||
739 | while (walk_state->scope_info) { | |
740 | state = walk_state->scope_info; | |
741 | walk_state->scope_info = state->common.next; | |
742 | ||
4be44fcd | 743 | acpi_ut_delete_generic_state(state); |
1da177e4 LT |
744 | } |
745 | ||
746 | /* Always must free any stacked result states */ | |
747 | ||
748 | while (walk_state->results) { | |
749 | state = walk_state->results; | |
750 | walk_state->results = state->common.next; | |
751 | ||
4be44fcd | 752 | acpi_ut_delete_generic_state(state); |
1da177e4 LT |
753 | } |
754 | ||
8313524a | 755 | ACPI_FREE(walk_state); |
1da177e4 LT |
756 | return_VOID; |
757 | } |