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1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psloop - Main AML parse loop | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2005, 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 | /* | |
46 | * Parse the AML and build an operation tree as most interpreters, | |
47 | * like Perl, do. Parsing is done by hand rather than with a YACC | |
48 | * generated parser to tightly constrain stack and dynamic memory | |
49 | * usage. At the same time, parsing is kept flexible and the code | |
50 | * fairly compact by parsing based on a list of AML opcode | |
51 | * templates in aml_op_info[] | |
52 | */ | |
53 | ||
54 | #include <acpi/acpi.h> | |
55 | #include <acpi/acparser.h> | |
56 | #include <acpi/acdispat.h> | |
57 | #include <acpi/amlcode.h> | |
58 | #include <acpi/acnamesp.h> | |
59 | #include <acpi/acinterp.h> | |
60 | ||
61 | #define _COMPONENT ACPI_PARSER | |
62 | ACPI_MODULE_NAME ("psloop") | |
63 | ||
64 | static u32 acpi_gbl_depth = 0; | |
65 | ||
66 | ||
67 | /******************************************************************************* | |
68 | * | |
69 | * FUNCTION: acpi_ps_parse_loop | |
70 | * | |
71 | * PARAMETERS: walk_state - Current state | |
72 | * | |
73 | * RETURN: Status | |
74 | * | |
75 | * DESCRIPTION: Parse AML (pointed to by the current parser state) and return | |
76 | * a tree of ops. | |
77 | * | |
78 | ******************************************************************************/ | |
79 | ||
80 | acpi_status | |
81 | acpi_ps_parse_loop ( | |
82 | struct acpi_walk_state *walk_state) | |
83 | { | |
84 | acpi_status status = AE_OK; | |
85 | acpi_status status2; | |
86 | union acpi_parse_object *op = NULL; /* current op */ | |
87 | union acpi_parse_object *arg = NULL; | |
88 | union acpi_parse_object *pre_op = NULL; | |
89 | struct acpi_parse_state *parser_state; | |
90 | u8 *aml_op_start = NULL; | |
91 | ||
92 | ||
93 | ACPI_FUNCTION_TRACE_PTR ("ps_parse_loop", walk_state); | |
94 | ||
95 | if (walk_state->descending_callback == NULL) { | |
96 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
97 | } | |
98 | ||
99 | parser_state = &walk_state->parser_state; | |
100 | walk_state->arg_types = 0; | |
101 | ||
102 | #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) | |
103 | ||
104 | if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) { | |
105 | /* We are restarting a preempted control method */ | |
106 | ||
107 | if (acpi_ps_has_completed_scope (parser_state)) { | |
108 | /* | |
109 | * We must check if a predicate to an IF or WHILE statement | |
110 | * was just completed | |
111 | */ | |
112 | if ((parser_state->scope->parse_scope.op) && | |
113 | ((parser_state->scope->parse_scope.op->common.aml_opcode == AML_IF_OP) || | |
114 | (parser_state->scope->parse_scope.op->common.aml_opcode == AML_WHILE_OP)) && | |
115 | (walk_state->control_state) && | |
116 | (walk_state->control_state->common.state == | |
117 | ACPI_CONTROL_PREDICATE_EXECUTING)) { | |
118 | /* | |
119 | * A predicate was just completed, get the value of the | |
120 | * predicate and branch based on that value | |
121 | */ | |
122 | walk_state->op = NULL; | |
123 | status = acpi_ds_get_predicate_value (walk_state, ACPI_TO_POINTER (TRUE)); | |
124 | if (ACPI_FAILURE (status) && | |
125 | ((status & AE_CODE_MASK) != AE_CODE_CONTROL)) { | |
126 | if (status == AE_AML_NO_RETURN_VALUE) { | |
127 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
128 | "Invoked method did not return a value, %s\n", | |
129 | acpi_format_exception (status))); | |
130 | ||
131 | } | |
132 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
133 | "get_predicate Failed, %s\n", | |
134 | acpi_format_exception (status))); | |
135 | return_ACPI_STATUS (status); | |
136 | } | |
137 | ||
138 | status = acpi_ps_next_parse_state (walk_state, op, status); | |
139 | } | |
140 | ||
141 | acpi_ps_pop_scope (parser_state, &op, | |
142 | &walk_state->arg_types, &walk_state->arg_count); | |
143 | ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op)); | |
144 | } | |
145 | else if (walk_state->prev_op) { | |
146 | /* We were in the middle of an op */ | |
147 | ||
148 | op = walk_state->prev_op; | |
149 | walk_state->arg_types = walk_state->prev_arg_types; | |
150 | } | |
151 | } | |
152 | #endif | |
153 | ||
154 | /* Iterative parsing loop, while there is more AML to process: */ | |
155 | ||
156 | while ((parser_state->aml < parser_state->aml_end) || (op)) { | |
157 | aml_op_start = parser_state->aml; | |
158 | if (!op) { | |
159 | /* Get the next opcode from the AML stream */ | |
160 | ||
161 | walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml, | |
162 | parser_state->aml_start); | |
163 | walk_state->opcode = acpi_ps_peek_opcode (parser_state); | |
164 | ||
165 | /* | |
166 | * First cut to determine what we have found: | |
167 | * 1) A valid AML opcode | |
168 | * 2) A name string | |
169 | * 3) An unknown/invalid opcode | |
170 | */ | |
171 | walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode); | |
172 | switch (walk_state->op_info->class) { | |
173 | case AML_CLASS_ASCII: | |
174 | case AML_CLASS_PREFIX: | |
175 | /* | |
176 | * Starts with a valid prefix or ASCII char, this is a name | |
177 | * string. Convert the bare name string to a namepath. | |
178 | */ | |
179 | walk_state->opcode = AML_INT_NAMEPATH_OP; | |
180 | walk_state->arg_types = ARGP_NAMESTRING; | |
181 | break; | |
182 | ||
183 | case AML_CLASS_UNKNOWN: | |
184 | ||
185 | /* The opcode is unrecognized. Just skip unknown opcodes */ | |
186 | ||
187 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
188 | "Found unknown opcode %X at AML address %p offset %X, ignoring\n", | |
189 | walk_state->opcode, parser_state->aml, walk_state->aml_offset)); | |
190 | ||
191 | ACPI_DUMP_BUFFER (parser_state->aml, 128); | |
192 | ||
193 | /* Assume one-byte bad opcode */ | |
194 | ||
195 | parser_state->aml++; | |
196 | continue; | |
197 | ||
198 | default: | |
199 | ||
200 | /* Found opcode info, this is a normal opcode */ | |
201 | ||
202 | parser_state->aml += acpi_ps_get_opcode_size (walk_state->opcode); | |
203 | walk_state->arg_types = walk_state->op_info->parse_args; | |
204 | break; | |
205 | } | |
206 | ||
207 | /* Create Op structure and append to parent's argument list */ | |
208 | ||
209 | if (walk_state->op_info->flags & AML_NAMED) { | |
210 | /* Allocate a new pre_op if necessary */ | |
211 | ||
212 | if (!pre_op) { | |
213 | pre_op = acpi_ps_alloc_op (walk_state->opcode); | |
214 | if (!pre_op) { | |
215 | status = AE_NO_MEMORY; | |
216 | goto close_this_op; | |
217 | } | |
218 | } | |
219 | ||
220 | pre_op->common.value.arg = NULL; | |
221 | pre_op->common.aml_opcode = walk_state->opcode; | |
222 | ||
223 | /* | |
224 | * Get and append arguments until we find the node that contains | |
225 | * the name (the type ARGP_NAME). | |
226 | */ | |
227 | while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) && | |
228 | (GET_CURRENT_ARG_TYPE (walk_state->arg_types) != ARGP_NAME)) { | |
229 | status = acpi_ps_get_next_arg (walk_state, parser_state, | |
230 | GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg); | |
231 | if (ACPI_FAILURE (status)) { | |
232 | goto close_this_op; | |
233 | } | |
234 | ||
235 | acpi_ps_append_arg (pre_op, arg); | |
236 | INCREMENT_ARG_LIST (walk_state->arg_types); | |
237 | } | |
238 | ||
239 | /* | |
240 | * Make sure that we found a NAME and didn't run out of | |
241 | * arguments | |
242 | */ | |
243 | if (!GET_CURRENT_ARG_TYPE (walk_state->arg_types)) { | |
244 | status = AE_AML_NO_OPERAND; | |
245 | goto close_this_op; | |
246 | } | |
247 | ||
248 | /* We know that this arg is a name, move to next arg */ | |
249 | ||
250 | INCREMENT_ARG_LIST (walk_state->arg_types); | |
251 | ||
252 | /* | |
253 | * Find the object. This will either insert the object into | |
254 | * the namespace or simply look it up | |
255 | */ | |
256 | walk_state->op = NULL; | |
257 | ||
258 | status = walk_state->descending_callback (walk_state, &op); | |
259 | if (ACPI_FAILURE (status)) { | |
260 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
261 | "During name lookup/catalog, %s\n", | |
262 | acpi_format_exception (status))); | |
263 | goto close_this_op; | |
264 | } | |
265 | ||
266 | if (!op) { | |
267 | continue; | |
268 | } | |
269 | ||
270 | status = acpi_ps_next_parse_state (walk_state, op, status); | |
271 | if (status == AE_CTRL_PENDING) { | |
272 | status = AE_OK; | |
273 | goto close_this_op; | |
274 | } | |
275 | ||
276 | if (ACPI_FAILURE (status)) { | |
277 | goto close_this_op; | |
278 | } | |
279 | ||
280 | acpi_ps_append_arg (op, pre_op->common.value.arg); | |
281 | acpi_gbl_depth++; | |
282 | ||
283 | if (op->common.aml_opcode == AML_REGION_OP) { | |
284 | /* | |
285 | * Defer final parsing of an operation_region body, | |
286 | * because we don't have enough info in the first pass | |
287 | * to parse it correctly (i.e., there may be method | |
288 | * calls within the term_arg elements of the body.) | |
289 | * | |
290 | * However, we must continue parsing because | |
291 | * the opregion is not a standalone package -- | |
292 | * we don't know where the end is at this point. | |
293 | * | |
294 | * (Length is unknown until parse of the body complete) | |
295 | */ | |
296 | op->named.data = aml_op_start; | |
297 | op->named.length = 0; | |
298 | } | |
299 | } | |
300 | else { | |
301 | /* Not a named opcode, just allocate Op and append to parent */ | |
302 | ||
303 | walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode); | |
304 | op = acpi_ps_alloc_op (walk_state->opcode); | |
305 | if (!op) { | |
306 | status = AE_NO_MEMORY; | |
307 | goto close_this_op; | |
308 | } | |
309 | ||
310 | if (walk_state->op_info->flags & AML_CREATE) { | |
311 | /* | |
312 | * Backup to beginning of create_xXXfield declaration | |
313 | * body_length is unknown until we parse the body | |
314 | */ | |
315 | op->named.data = aml_op_start; | |
316 | op->named.length = 0; | |
317 | } | |
318 | ||
319 | acpi_ps_append_arg (acpi_ps_get_parent_scope (parser_state), op); | |
320 | ||
321 | if ((walk_state->descending_callback != NULL)) { | |
322 | /* | |
323 | * Find the object. This will either insert the object into | |
324 | * the namespace or simply look it up | |
325 | */ | |
326 | walk_state->op = op; | |
327 | ||
328 | status = walk_state->descending_callback (walk_state, &op); | |
329 | status = acpi_ps_next_parse_state (walk_state, op, status); | |
330 | if (status == AE_CTRL_PENDING) { | |
331 | status = AE_OK; | |
332 | goto close_this_op; | |
333 | } | |
334 | ||
335 | if (ACPI_FAILURE (status)) { | |
336 | goto close_this_op; | |
337 | } | |
338 | } | |
339 | } | |
340 | ||
341 | op->common.aml_offset = walk_state->aml_offset; | |
342 | ||
343 | if (walk_state->op_info) { | |
344 | ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, | |
345 | "Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n", | |
346 | (u32) op->common.aml_opcode, walk_state->op_info->name, | |
347 | op, parser_state->aml, op->common.aml_offset)); | |
348 | } | |
349 | } | |
350 | ||
351 | ||
352 | /* | |
353 | * Start arg_count at zero because we don't know if there are | |
354 | * any args yet | |
355 | */ | |
356 | walk_state->arg_count = 0; | |
357 | ||
358 | /* Are there any arguments that must be processed? */ | |
359 | ||
360 | if (walk_state->arg_types) { | |
361 | /* Get arguments */ | |
362 | ||
363 | switch (op->common.aml_opcode) { | |
364 | case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ | |
365 | case AML_WORD_OP: /* AML_WORDDATA_ARG */ | |
366 | case AML_DWORD_OP: /* AML_DWORDATA_ARG */ | |
367 | case AML_QWORD_OP: /* AML_QWORDATA_ARG */ | |
368 | case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ | |
369 | ||
370 | /* Fill in constant or string argument directly */ | |
371 | ||
372 | acpi_ps_get_next_simple_arg (parser_state, | |
373 | GET_CURRENT_ARG_TYPE (walk_state->arg_types), op); | |
374 | break; | |
375 | ||
376 | case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ | |
377 | ||
378 | status = acpi_ps_get_next_namepath (walk_state, parser_state, op, 1); | |
379 | if (ACPI_FAILURE (status)) { | |
380 | goto close_this_op; | |
381 | } | |
382 | ||
383 | walk_state->arg_types = 0; | |
384 | break; | |
385 | ||
386 | default: | |
387 | /* | |
388 | * Op is not a constant or string, append each argument | |
389 | * to the Op | |
390 | */ | |
391 | while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) && | |
392 | !walk_state->arg_count) { | |
393 | walk_state->aml_offset = (u32) | |
394 | ACPI_PTR_DIFF (parser_state->aml, parser_state->aml_start); | |
395 | ||
396 | status = acpi_ps_get_next_arg (walk_state, parser_state, | |
397 | GET_CURRENT_ARG_TYPE (walk_state->arg_types), | |
398 | &arg); | |
399 | if (ACPI_FAILURE (status)) { | |
400 | goto close_this_op; | |
401 | } | |
402 | ||
403 | if (arg) { | |
404 | arg->common.aml_offset = walk_state->aml_offset; | |
405 | acpi_ps_append_arg (op, arg); | |
406 | } | |
407 | INCREMENT_ARG_LIST (walk_state->arg_types); | |
408 | } | |
409 | ||
410 | /* Special processing for certain opcodes */ | |
411 | ||
412 | if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS1) && | |
413 | ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) { | |
414 | /* | |
415 | * We want to skip If/Else/While constructs during Pass1 | |
416 | * because we want to actually conditionally execute the | |
417 | * code during Pass2. | |
418 | * | |
419 | * Except for disassembly, where we always want to | |
420 | * walk the If/Else/While packages | |
421 | */ | |
422 | switch (op->common.aml_opcode) { | |
423 | case AML_IF_OP: | |
424 | case AML_ELSE_OP: | |
425 | case AML_WHILE_OP: | |
426 | ||
427 | /* Skip body of if/else/while in pass 1 */ | |
428 | ||
429 | parser_state->aml = parser_state->pkg_end; | |
430 | walk_state->arg_count = 0; | |
431 | break; | |
432 | ||
433 | default: | |
434 | break; | |
435 | } | |
436 | } | |
437 | ||
438 | switch (op->common.aml_opcode) { | |
439 | case AML_METHOD_OP: | |
440 | ||
441 | /* | |
442 | * Skip parsing of control method | |
443 | * because we don't have enough info in the first pass | |
444 | * to parse it correctly. | |
445 | * | |
446 | * Save the length and address of the body | |
447 | */ | |
448 | op->named.data = parser_state->aml; | |
449 | op->named.length = (u32) (parser_state->pkg_end - | |
450 | parser_state->aml); | |
451 | ||
452 | /* Skip body of method */ | |
453 | ||
454 | parser_state->aml = parser_state->pkg_end; | |
455 | walk_state->arg_count = 0; | |
456 | break; | |
457 | ||
458 | case AML_BUFFER_OP: | |
459 | case AML_PACKAGE_OP: | |
460 | case AML_VAR_PACKAGE_OP: | |
461 | ||
462 | if ((op->common.parent) && | |
463 | (op->common.parent->common.aml_opcode == AML_NAME_OP) && | |
464 | (walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2)) { | |
465 | /* | |
466 | * Skip parsing of Buffers and Packages | |
467 | * because we don't have enough info in the first pass | |
468 | * to parse them correctly. | |
469 | */ | |
470 | op->named.data = aml_op_start; | |
471 | op->named.length = (u32) (parser_state->pkg_end - | |
472 | aml_op_start); | |
473 | ||
474 | /* Skip body */ | |
475 | ||
476 | parser_state->aml = parser_state->pkg_end; | |
477 | walk_state->arg_count = 0; | |
478 | } | |
479 | break; | |
480 | ||
481 | case AML_WHILE_OP: | |
482 | ||
483 | if (walk_state->control_state) { | |
484 | walk_state->control_state->control.package_end = | |
485 | parser_state->pkg_end; | |
486 | } | |
487 | break; | |
488 | ||
489 | default: | |
490 | ||
491 | /* No action for all other opcodes */ | |
492 | break; | |
493 | } | |
494 | break; | |
495 | } | |
496 | } | |
497 | ||
498 | /* Check for arguments that need to be processed */ | |
499 | ||
500 | if (walk_state->arg_count) { | |
501 | /* | |
502 | * There are arguments (complex ones), push Op and | |
503 | * prepare for argument | |
504 | */ | |
505 | status = acpi_ps_push_scope (parser_state, op, | |
506 | walk_state->arg_types, walk_state->arg_count); | |
507 | if (ACPI_FAILURE (status)) { | |
508 | goto close_this_op; | |
509 | } | |
510 | op = NULL; | |
511 | continue; | |
512 | } | |
513 | ||
514 | /* | |
515 | * All arguments have been processed -- Op is complete, | |
516 | * prepare for next | |
517 | */ | |
518 | walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode); | |
519 | if (walk_state->op_info->flags & AML_NAMED) { | |
520 | if (acpi_gbl_depth) { | |
521 | acpi_gbl_depth--; | |
522 | } | |
523 | ||
524 | if (op->common.aml_opcode == AML_REGION_OP) { | |
525 | /* | |
526 | * Skip parsing of control method or opregion body, | |
527 | * because we don't have enough info in the first pass | |
528 | * to parse them correctly. | |
529 | * | |
530 | * Completed parsing an op_region declaration, we now | |
531 | * know the length. | |
532 | */ | |
533 | op->named.length = (u32) (parser_state->aml - op->named.data); | |
534 | } | |
535 | } | |
536 | ||
537 | if (walk_state->op_info->flags & AML_CREATE) { | |
538 | /* | |
539 | * Backup to beginning of create_xXXfield declaration (1 for | |
540 | * Opcode) | |
541 | * | |
542 | * body_length is unknown until we parse the body | |
543 | */ | |
544 | op->named.length = (u32) (parser_state->aml - op->named.data); | |
545 | } | |
546 | ||
547 | /* This op complete, notify the dispatcher */ | |
548 | ||
549 | if (walk_state->ascending_callback != NULL) { | |
550 | walk_state->op = op; | |
551 | walk_state->opcode = op->common.aml_opcode; | |
552 | ||
553 | status = walk_state->ascending_callback (walk_state); | |
554 | status = acpi_ps_next_parse_state (walk_state, op, status); | |
555 | if (status == AE_CTRL_PENDING) { | |
556 | status = AE_OK; | |
557 | goto close_this_op; | |
558 | } | |
559 | } | |
560 | ||
561 | ||
562 | close_this_op: | |
563 | /* | |
564 | * Finished one argument of the containing scope | |
565 | */ | |
566 | parser_state->scope->parse_scope.arg_count--; | |
567 | ||
568 | /* Finished with pre_op */ | |
569 | ||
570 | if (pre_op) { | |
571 | acpi_ps_free_op (pre_op); | |
572 | pre_op = NULL; | |
573 | } | |
574 | ||
575 | /* Close this Op (will result in parse subtree deletion) */ | |
576 | ||
577 | status2 = acpi_ps_complete_this_op (walk_state, op); | |
578 | if (ACPI_FAILURE (status2)) { | |
579 | return_ACPI_STATUS (status2); | |
580 | } | |
581 | op = NULL; | |
582 | ||
583 | switch (status) { | |
584 | case AE_OK: | |
585 | break; | |
586 | ||
587 | ||
588 | case AE_CTRL_TRANSFER: | |
589 | ||
590 | /* We are about to transfer to a called method. */ | |
591 | ||
592 | walk_state->prev_op = op; | |
593 | walk_state->prev_arg_types = walk_state->arg_types; | |
594 | return_ACPI_STATUS (status); | |
595 | ||
596 | ||
597 | case AE_CTRL_END: | |
598 | ||
599 | acpi_ps_pop_scope (parser_state, &op, | |
600 | &walk_state->arg_types, &walk_state->arg_count); | |
601 | ||
602 | if (op) { | |
603 | walk_state->op = op; | |
604 | walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode); | |
605 | walk_state->opcode = op->common.aml_opcode; | |
606 | ||
607 | status = walk_state->ascending_callback (walk_state); | |
608 | status = acpi_ps_next_parse_state (walk_state, op, status); | |
609 | ||
610 | status2 = acpi_ps_complete_this_op (walk_state, op); | |
611 | if (ACPI_FAILURE (status2)) { | |
612 | return_ACPI_STATUS (status2); | |
613 | } | |
614 | op = NULL; | |
615 | } | |
616 | status = AE_OK; | |
617 | break; | |
618 | ||
619 | ||
620 | case AE_CTRL_BREAK: | |
621 | case AE_CTRL_CONTINUE: | |
622 | ||
623 | /* Pop off scopes until we find the While */ | |
624 | ||
625 | while (!op || (op->common.aml_opcode != AML_WHILE_OP)) { | |
626 | acpi_ps_pop_scope (parser_state, &op, | |
627 | &walk_state->arg_types, &walk_state->arg_count); | |
628 | } | |
629 | ||
630 | /* Close this iteration of the While loop */ | |
631 | ||
632 | walk_state->op = op; | |
633 | walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode); | |
634 | walk_state->opcode = op->common.aml_opcode; | |
635 | ||
636 | status = walk_state->ascending_callback (walk_state); | |
637 | status = acpi_ps_next_parse_state (walk_state, op, status); | |
638 | ||
639 | status2 = acpi_ps_complete_this_op (walk_state, op); | |
640 | if (ACPI_FAILURE (status2)) { | |
641 | return_ACPI_STATUS (status2); | |
642 | } | |
643 | op = NULL; | |
644 | ||
645 | status = AE_OK; | |
646 | break; | |
647 | ||
648 | ||
649 | case AE_CTRL_TERMINATE: | |
650 | ||
651 | status = AE_OK; | |
652 | ||
653 | /* Clean up */ | |
654 | do { | |
655 | if (op) { | |
656 | status2 = acpi_ps_complete_this_op (walk_state, op); | |
657 | if (ACPI_FAILURE (status2)) { | |
658 | return_ACPI_STATUS (status2); | |
659 | } | |
660 | } | |
661 | acpi_ps_pop_scope (parser_state, &op, | |
662 | &walk_state->arg_types, &walk_state->arg_count); | |
663 | ||
664 | } while (op); | |
665 | ||
666 | return_ACPI_STATUS (status); | |
667 | ||
668 | ||
669 | default: /* All other non-AE_OK status */ | |
670 | ||
671 | do { | |
672 | if (op) { | |
673 | status2 = acpi_ps_complete_this_op (walk_state, op); | |
674 | if (ACPI_FAILURE (status2)) { | |
675 | return_ACPI_STATUS (status2); | |
676 | } | |
677 | } | |
678 | acpi_ps_pop_scope (parser_state, &op, | |
679 | &walk_state->arg_types, &walk_state->arg_count); | |
680 | ||
681 | } while (op); | |
682 | ||
683 | ||
684 | /* | |
685 | * TBD: Cleanup parse ops on error | |
686 | */ | |
687 | #if 0 | |
688 | if (op == NULL) { | |
689 | acpi_ps_pop_scope (parser_state, &op, | |
690 | &walk_state->arg_types, &walk_state->arg_count); | |
691 | } | |
692 | #endif | |
693 | walk_state->prev_op = op; | |
694 | walk_state->prev_arg_types = walk_state->arg_types; | |
695 | return_ACPI_STATUS (status); | |
696 | } | |
697 | ||
698 | /* This scope complete? */ | |
699 | ||
700 | if (acpi_ps_has_completed_scope (parser_state)) { | |
701 | acpi_ps_pop_scope (parser_state, &op, | |
702 | &walk_state->arg_types, &walk_state->arg_count); | |
703 | ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op)); | |
704 | } | |
705 | else { | |
706 | op = NULL; | |
707 | } | |
708 | ||
709 | } /* while parser_state->Aml */ | |
710 | ||
711 | ||
712 | /* | |
713 | * Complete the last Op (if not completed), and clear the scope stack. | |
714 | * It is easily possible to end an AML "package" with an unbounded number | |
715 | * of open scopes (such as when several ASL blocks are closed with | |
716 | * sequential closing braces). We want to terminate each one cleanly. | |
717 | */ | |
718 | ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "AML package complete at Op %p\n", op)); | |
719 | do { | |
720 | if (op) { | |
721 | if (walk_state->ascending_callback != NULL) { | |
722 | walk_state->op = op; | |
723 | walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode); | |
724 | walk_state->opcode = op->common.aml_opcode; | |
725 | ||
726 | status = walk_state->ascending_callback (walk_state); | |
727 | status = acpi_ps_next_parse_state (walk_state, op, status); | |
728 | if (status == AE_CTRL_PENDING) { | |
729 | status = AE_OK; | |
730 | goto close_this_op; | |
731 | } | |
732 | ||
733 | if (status == AE_CTRL_TERMINATE) { | |
734 | status = AE_OK; | |
735 | ||
736 | /* Clean up */ | |
737 | do { | |
738 | if (op) { | |
739 | status2 = acpi_ps_complete_this_op (walk_state, op); | |
740 | if (ACPI_FAILURE (status2)) { | |
741 | return_ACPI_STATUS (status2); | |
742 | } | |
743 | } | |
744 | ||
745 | acpi_ps_pop_scope (parser_state, &op, | |
746 | &walk_state->arg_types, &walk_state->arg_count); | |
747 | ||
748 | } while (op); | |
749 | ||
750 | return_ACPI_STATUS (status); | |
751 | } | |
752 | ||
753 | else if (ACPI_FAILURE (status)) { | |
754 | /* First error is most important */ | |
755 | ||
756 | (void) acpi_ps_complete_this_op (walk_state, op); | |
757 | return_ACPI_STATUS (status); | |
758 | } | |
759 | } | |
760 | ||
761 | status2 = acpi_ps_complete_this_op (walk_state, op); | |
762 | if (ACPI_FAILURE (status2)) { | |
763 | return_ACPI_STATUS (status2); | |
764 | } | |
765 | } | |
766 | ||
767 | acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, | |
768 | &walk_state->arg_count); | |
769 | ||
770 | } while (op); | |
771 | ||
772 | return_ACPI_STATUS (status); | |
773 | } | |
774 | ||
775 |