Commit | Line | Data |
---|---|---|
73459f73 RM |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psloop - Main AML parse loop | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
6c9deb72 | 8 | * Copyright (C) 2000 - 2007, R. Byron Moore |
73459f73 RM |
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 | ||
73459f73 | 44 | /* |
4d0b4af9 MK |
45 | * Parse the AML and build an operation tree as most interpreters, (such as |
46 | * Perl) do. Parsing is done by hand rather than with a YACC generated parser | |
47 | * to tightly constrain stack and dynamic memory usage. Parsing is kept | |
48 | * flexible and the code fairly compact by parsing based on a list of AML | |
49 | * opcode templates in aml_op_info[]. | |
73459f73 RM |
50 | */ |
51 | ||
52 | #include <acpi/acpi.h> | |
53 | #include <acpi/acparser.h> | |
54 | #include <acpi/acdispat.h> | |
55 | #include <acpi/amlcode.h> | |
73459f73 RM |
56 | |
57 | #define _COMPONENT ACPI_PARSER | |
4be44fcd | 58 | ACPI_MODULE_NAME("psloop") |
73459f73 | 59 | |
4be44fcd | 60 | static u32 acpi_gbl_depth = 0; |
73459f73 | 61 | |
4d0b4af9 MK |
62 | /* Local prototypes */ |
63 | ||
64 | static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state); | |
65 | ||
66 | static acpi_status | |
67 | acpi_ps_build_named_op(struct acpi_walk_state *walk_state, | |
68 | u8 * aml_op_start, | |
69 | union acpi_parse_object *unnamed_op, | |
70 | union acpi_parse_object **op); | |
71 | ||
72 | static acpi_status | |
73 | acpi_ps_create_op(struct acpi_walk_state *walk_state, | |
74 | u8 * aml_op_start, union acpi_parse_object **new_op); | |
75 | ||
76 | static acpi_status | |
77 | acpi_ps_get_arguments(struct acpi_walk_state *walk_state, | |
78 | u8 * aml_op_start, union acpi_parse_object *op); | |
79 | ||
80 | static acpi_status | |
81 | acpi_ps_complete_op(struct acpi_walk_state *walk_state, | |
82 | union acpi_parse_object **op, acpi_status status); | |
83 | ||
84 | static acpi_status | |
85 | acpi_ps_complete_final_op(struct acpi_walk_state *walk_state, | |
86 | union acpi_parse_object *op, acpi_status status); | |
87 | ||
88 | /******************************************************************************* | |
89 | * | |
90 | * FUNCTION: acpi_ps_get_aml_opcode | |
91 | * | |
92 | * PARAMETERS: walk_state - Current state | |
93 | * | |
94 | * RETURN: Status | |
95 | * | |
96 | * DESCRIPTION: Extract the next AML opcode from the input stream. | |
97 | * | |
98 | ******************************************************************************/ | |
99 | ||
100 | static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state) | |
101 | { | |
102 | ||
103 | ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state); | |
104 | ||
105 | walk_state->aml_offset = | |
106 | (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml, | |
107 | walk_state->parser_state.aml_start); | |
108 | walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state)); | |
109 | ||
110 | /* | |
111 | * First cut to determine what we have found: | |
112 | * 1) A valid AML opcode | |
113 | * 2) A name string | |
114 | * 3) An unknown/invalid opcode | |
115 | */ | |
116 | walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode); | |
117 | ||
118 | switch (walk_state->op_info->class) { | |
119 | case AML_CLASS_ASCII: | |
120 | case AML_CLASS_PREFIX: | |
121 | /* | |
122 | * Starts with a valid prefix or ASCII char, this is a name | |
123 | * string. Convert the bare name string to a namepath. | |
124 | */ | |
125 | walk_state->opcode = AML_INT_NAMEPATH_OP; | |
126 | walk_state->arg_types = ARGP_NAMESTRING; | |
127 | break; | |
128 | ||
129 | case AML_CLASS_UNKNOWN: | |
130 | ||
131 | /* The opcode is unrecognized. Just skip unknown opcodes */ | |
132 | ||
133 | ACPI_ERROR((AE_INFO, | |
134 | "Found unknown opcode %X at AML address %p offset %X, ignoring", | |
135 | walk_state->opcode, walk_state->parser_state.aml, | |
136 | walk_state->aml_offset)); | |
137 | ||
138 | ACPI_DUMP_BUFFER(walk_state->parser_state.aml, 128); | |
139 | ||
140 | /* Assume one-byte bad opcode */ | |
141 | ||
142 | walk_state->parser_state.aml++; | |
143 | return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE); | |
144 | ||
145 | default: | |
146 | ||
147 | /* Found opcode info, this is a normal opcode */ | |
148 | ||
149 | walk_state->parser_state.aml += | |
150 | acpi_ps_get_opcode_size(walk_state->opcode); | |
151 | walk_state->arg_types = walk_state->op_info->parse_args; | |
152 | break; | |
153 | } | |
154 | ||
155 | return_ACPI_STATUS(AE_OK); | |
156 | } | |
157 | ||
158 | /******************************************************************************* | |
159 | * | |
160 | * FUNCTION: acpi_ps_build_named_op | |
161 | * | |
162 | * PARAMETERS: walk_state - Current state | |
163 | * aml_op_start - Begin of named Op in AML | |
164 | * unnamed_op - Early Op (not a named Op) | |
165 | * Op - Returned Op | |
166 | * | |
167 | * RETURN: Status | |
168 | * | |
169 | * DESCRIPTION: Parse a named Op | |
170 | * | |
171 | ******************************************************************************/ | |
172 | ||
173 | static acpi_status | |
174 | acpi_ps_build_named_op(struct acpi_walk_state *walk_state, | |
175 | u8 * aml_op_start, | |
176 | union acpi_parse_object *unnamed_op, | |
177 | union acpi_parse_object **op) | |
178 | { | |
179 | acpi_status status = AE_OK; | |
180 | union acpi_parse_object *arg = NULL; | |
181 | ||
182 | ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state); | |
183 | ||
184 | unnamed_op->common.value.arg = NULL; | |
185 | unnamed_op->common.aml_opcode = walk_state->opcode; | |
186 | ||
187 | /* | |
188 | * Get and append arguments until we find the node that contains | |
189 | * the name (the type ARGP_NAME). | |
190 | */ | |
191 | while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) && | |
192 | (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) { | |
193 | status = | |
194 | acpi_ps_get_next_arg(walk_state, | |
195 | &(walk_state->parser_state), | |
196 | GET_CURRENT_ARG_TYPE(walk_state-> | |
197 | arg_types), &arg); | |
198 | if (ACPI_FAILURE(status)) { | |
199 | return_ACPI_STATUS(status); | |
200 | } | |
201 | ||
202 | acpi_ps_append_arg(unnamed_op, arg); | |
203 | INCREMENT_ARG_LIST(walk_state->arg_types); | |
204 | } | |
205 | ||
206 | /* | |
207 | * Make sure that we found a NAME and didn't run out of arguments | |
208 | */ | |
209 | if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) { | |
210 | return_ACPI_STATUS(AE_AML_NO_OPERAND); | |
211 | } | |
212 | ||
213 | /* We know that this arg is a name, move to next arg */ | |
214 | ||
215 | INCREMENT_ARG_LIST(walk_state->arg_types); | |
216 | ||
217 | /* | |
218 | * Find the object. This will either insert the object into | |
219 | * the namespace or simply look it up | |
220 | */ | |
221 | walk_state->op = NULL; | |
222 | ||
223 | status = walk_state->descending_callback(walk_state, op); | |
224 | if (ACPI_FAILURE(status)) { | |
225 | ACPI_EXCEPTION((AE_INFO, status, "During name lookup/catalog")); | |
226 | return_ACPI_STATUS(status); | |
227 | } | |
228 | ||
9bc75cff | 229 | if (!*op) { |
4d0b4af9 MK |
230 | return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE); |
231 | } | |
232 | ||
233 | status = acpi_ps_next_parse_state(walk_state, *op, status); | |
234 | if (ACPI_FAILURE(status)) { | |
235 | if (status == AE_CTRL_PENDING) { | |
236 | return_ACPI_STATUS(AE_CTRL_PARSE_PENDING); | |
237 | } | |
238 | return_ACPI_STATUS(status); | |
239 | } | |
240 | ||
241 | acpi_ps_append_arg(*op, unnamed_op->common.value.arg); | |
242 | acpi_gbl_depth++; | |
243 | ||
244 | if ((*op)->common.aml_opcode == AML_REGION_OP) { | |
245 | /* | |
246 | * Defer final parsing of an operation_region body, because we don't | |
247 | * have enough info in the first pass to parse it correctly (i.e., | |
248 | * there may be method calls within the term_arg elements of the body.) | |
249 | * | |
250 | * However, we must continue parsing because the opregion is not a | |
251 | * standalone package -- we don't know where the end is at this point. | |
252 | * | |
253 | * (Length is unknown until parse of the body complete) | |
254 | */ | |
255 | (*op)->named.data = aml_op_start; | |
256 | (*op)->named.length = 0; | |
257 | } | |
258 | ||
259 | return_ACPI_STATUS(AE_OK); | |
260 | } | |
261 | ||
262 | /******************************************************************************* | |
263 | * | |
264 | * FUNCTION: acpi_ps_create_op | |
265 | * | |
266 | * PARAMETERS: walk_state - Current state | |
267 | * aml_op_start - Op start in AML | |
268 | * new_op - Returned Op | |
269 | * | |
270 | * RETURN: Status | |
271 | * | |
272 | * DESCRIPTION: Get Op from AML | |
273 | * | |
274 | ******************************************************************************/ | |
275 | ||
276 | static acpi_status | |
277 | acpi_ps_create_op(struct acpi_walk_state *walk_state, | |
278 | u8 * aml_op_start, union acpi_parse_object **new_op) | |
279 | { | |
280 | acpi_status status = AE_OK; | |
281 | union acpi_parse_object *op; | |
282 | union acpi_parse_object *named_op = NULL; | |
283 | ||
284 | ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state); | |
285 | ||
286 | status = acpi_ps_get_aml_opcode(walk_state); | |
287 | if (status == AE_CTRL_PARSE_CONTINUE) { | |
288 | return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE); | |
289 | } | |
290 | ||
291 | /* Create Op structure and append to parent's argument list */ | |
292 | ||
293 | walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode); | |
294 | op = acpi_ps_alloc_op(walk_state->opcode); | |
295 | if (!op) { | |
296 | return_ACPI_STATUS(AE_NO_MEMORY); | |
297 | } | |
298 | ||
299 | if (walk_state->op_info->flags & AML_NAMED) { | |
300 | status = | |
301 | acpi_ps_build_named_op(walk_state, aml_op_start, op, | |
302 | &named_op); | |
303 | acpi_ps_free_op(op); | |
304 | if (ACPI_FAILURE(status)) { | |
305 | return_ACPI_STATUS(status); | |
306 | } | |
307 | ||
308 | *new_op = named_op; | |
309 | return_ACPI_STATUS(AE_OK); | |
310 | } | |
311 | ||
312 | /* Not a named opcode, just allocate Op and append to parent */ | |
313 | ||
314 | if (walk_state->op_info->flags & AML_CREATE) { | |
315 | /* | |
316 | * Backup to beginning of create_xXXfield declaration | |
317 | * body_length is unknown until we parse the body | |
318 | */ | |
319 | op->named.data = aml_op_start; | |
320 | op->named.length = 0; | |
321 | } | |
322 | ||
323 | acpi_ps_append_arg(acpi_ps_get_parent_scope | |
324 | (&(walk_state->parser_state)), op); | |
325 | ||
326 | if (walk_state->descending_callback != NULL) { | |
327 | /* | |
328 | * Find the object. This will either insert the object into | |
329 | * the namespace or simply look it up | |
330 | */ | |
331 | walk_state->op = *new_op = op; | |
332 | ||
333 | status = walk_state->descending_callback(walk_state, &op); | |
334 | status = acpi_ps_next_parse_state(walk_state, op, status); | |
335 | if (status == AE_CTRL_PENDING) { | |
336 | status = AE_CTRL_PARSE_PENDING; | |
337 | } | |
338 | } | |
339 | ||
340 | return_ACPI_STATUS(status); | |
341 | } | |
342 | ||
343 | /******************************************************************************* | |
344 | * | |
345 | * FUNCTION: acpi_ps_get_arguments | |
346 | * | |
347 | * PARAMETERS: walk_state - Current state | |
348 | * aml_op_start - Op start in AML | |
349 | * Op - Current Op | |
350 | * | |
351 | * RETURN: Status | |
352 | * | |
353 | * DESCRIPTION: Get arguments for passed Op. | |
354 | * | |
355 | ******************************************************************************/ | |
356 | ||
357 | static acpi_status | |
358 | acpi_ps_get_arguments(struct acpi_walk_state *walk_state, | |
359 | u8 * aml_op_start, union acpi_parse_object *op) | |
360 | { | |
361 | acpi_status status = AE_OK; | |
362 | union acpi_parse_object *arg = NULL; | |
363 | ||
364 | ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state); | |
365 | ||
366 | switch (op->common.aml_opcode) { | |
367 | case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ | |
368 | case AML_WORD_OP: /* AML_WORDDATA_ARG */ | |
369 | case AML_DWORD_OP: /* AML_DWORDATA_ARG */ | |
370 | case AML_QWORD_OP: /* AML_QWORDATA_ARG */ | |
371 | case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ | |
372 | ||
373 | /* Fill in constant or string argument directly */ | |
374 | ||
375 | acpi_ps_get_next_simple_arg(&(walk_state->parser_state), | |
376 | GET_CURRENT_ARG_TYPE(walk_state-> | |
377 | arg_types), | |
378 | op); | |
379 | break; | |
380 | ||
381 | case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ | |
382 | ||
383 | status = | |
384 | acpi_ps_get_next_namepath(walk_state, | |
385 | &(walk_state->parser_state), op, | |
386 | 1); | |
387 | if (ACPI_FAILURE(status)) { | |
388 | return_ACPI_STATUS(status); | |
389 | } | |
390 | ||
391 | walk_state->arg_types = 0; | |
392 | break; | |
393 | ||
394 | default: | |
395 | /* | |
396 | * Op is not a constant or string, append each argument to the Op | |
397 | */ | |
398 | while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) | |
399 | && !walk_state->arg_count) { | |
400 | walk_state->aml_offset = | |
401 | (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml, | |
402 | walk_state->parser_state. | |
403 | aml_start); | |
404 | ||
405 | status = | |
406 | acpi_ps_get_next_arg(walk_state, | |
407 | &(walk_state->parser_state), | |
408 | GET_CURRENT_ARG_TYPE | |
409 | (walk_state->arg_types), &arg); | |
410 | if (ACPI_FAILURE(status)) { | |
411 | return_ACPI_STATUS(status); | |
412 | } | |
413 | ||
414 | if (arg) { | |
415 | arg->common.aml_offset = walk_state->aml_offset; | |
416 | acpi_ps_append_arg(op, arg); | |
417 | } | |
418 | ||
419 | INCREMENT_ARG_LIST(walk_state->arg_types); | |
420 | } | |
421 | ||
422 | /* Special processing for certain opcodes */ | |
423 | ||
424 | /* TBD (remove): Temporary mechanism to disable this code if needed */ | |
425 | ||
426 | #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE | |
427 | ||
428 | if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS1) && | |
429 | ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) { | |
430 | /* | |
431 | * We want to skip If/Else/While constructs during Pass1 because we | |
432 | * want to actually conditionally execute the code during Pass2. | |
433 | * | |
434 | * Except for disassembly, where we always want to walk the | |
435 | * If/Else/While packages | |
436 | */ | |
437 | switch (op->common.aml_opcode) { | |
438 | case AML_IF_OP: | |
439 | case AML_ELSE_OP: | |
440 | case AML_WHILE_OP: | |
441 | ||
442 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
443 | "Pass1: Skipping an If/Else/While body\n")); | |
444 | ||
445 | /* Skip body of if/else/while in pass 1 */ | |
446 | ||
447 | walk_state->parser_state.aml = | |
448 | walk_state->parser_state.pkg_end; | |
449 | walk_state->arg_count = 0; | |
450 | break; | |
451 | ||
452 | default: | |
453 | break; | |
454 | } | |
455 | } | |
456 | #endif | |
457 | ||
458 | switch (op->common.aml_opcode) { | |
459 | case AML_METHOD_OP: | |
460 | /* | |
461 | * Skip parsing of control method because we don't have enough | |
462 | * info in the first pass to parse it correctly. | |
463 | * | |
464 | * Save the length and address of the body | |
465 | */ | |
466 | op->named.data = walk_state->parser_state.aml; | |
467 | op->named.length = (u32) | |
468 | (walk_state->parser_state.pkg_end - | |
469 | walk_state->parser_state.aml); | |
470 | ||
471 | /* Skip body of method */ | |
472 | ||
473 | walk_state->parser_state.aml = | |
474 | walk_state->parser_state.pkg_end; | |
475 | walk_state->arg_count = 0; | |
476 | break; | |
477 | ||
478 | case AML_BUFFER_OP: | |
479 | case AML_PACKAGE_OP: | |
480 | case AML_VAR_PACKAGE_OP: | |
481 | ||
482 | if ((op->common.parent) && | |
483 | (op->common.parent->common.aml_opcode == | |
484 | AML_NAME_OP) | |
485 | && (walk_state->pass_number <= | |
486 | ACPI_IMODE_LOAD_PASS2)) { | |
487 | /* | |
488 | * Skip parsing of Buffers and Packages because we don't have | |
489 | * enough info in the first pass to parse them correctly. | |
490 | */ | |
491 | op->named.data = aml_op_start; | |
492 | op->named.length = (u32) | |
493 | (walk_state->parser_state.pkg_end - | |
494 | aml_op_start); | |
495 | ||
496 | /* Skip body */ | |
497 | ||
498 | walk_state->parser_state.aml = | |
499 | walk_state->parser_state.pkg_end; | |
500 | walk_state->arg_count = 0; | |
501 | } | |
502 | break; | |
503 | ||
504 | case AML_WHILE_OP: | |
505 | ||
506 | if (walk_state->control_state) { | |
507 | walk_state->control_state->control.package_end = | |
508 | walk_state->parser_state.pkg_end; | |
509 | } | |
510 | break; | |
511 | ||
512 | default: | |
513 | ||
514 | /* No action for all other opcodes */ | |
515 | break; | |
516 | } | |
517 | ||
518 | break; | |
519 | } | |
520 | ||
521 | return_ACPI_STATUS(AE_OK); | |
522 | } | |
523 | ||
524 | /******************************************************************************* | |
525 | * | |
526 | * FUNCTION: acpi_ps_complete_op | |
527 | * | |
528 | * PARAMETERS: walk_state - Current state | |
529 | * Op - Returned Op | |
530 | * Status - Parse status before complete Op | |
531 | * | |
532 | * RETURN: Status | |
533 | * | |
534 | * DESCRIPTION: Complete Op | |
535 | * | |
536 | ******************************************************************************/ | |
537 | ||
538 | static acpi_status | |
539 | acpi_ps_complete_op(struct acpi_walk_state *walk_state, | |
540 | union acpi_parse_object **op, acpi_status status) | |
541 | { | |
542 | acpi_status status2; | |
543 | ||
544 | ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state); | |
545 | ||
546 | /* | |
547 | * Finished one argument of the containing scope | |
548 | */ | |
549 | walk_state->parser_state.scope->parse_scope.arg_count--; | |
550 | ||
551 | /* Close this Op (will result in parse subtree deletion) */ | |
552 | ||
553 | status2 = acpi_ps_complete_this_op(walk_state, *op); | |
554 | if (ACPI_FAILURE(status2)) { | |
555 | return_ACPI_STATUS(status2); | |
556 | } | |
557 | ||
558 | *op = NULL; | |
559 | ||
560 | switch (status) { | |
561 | case AE_OK: | |
562 | break; | |
563 | ||
564 | case AE_CTRL_TRANSFER: | |
565 | ||
566 | /* We are about to transfer to a called method */ | |
567 | ||
568 | walk_state->prev_op = NULL; | |
569 | walk_state->prev_arg_types = walk_state->arg_types; | |
570 | return_ACPI_STATUS(status); | |
571 | ||
572 | case AE_CTRL_END: | |
573 | ||
574 | acpi_ps_pop_scope(&(walk_state->parser_state), op, | |
575 | &walk_state->arg_types, | |
576 | &walk_state->arg_count); | |
577 | ||
578 | if (*op) { | |
579 | walk_state->op = *op; | |
580 | walk_state->op_info = | |
581 | acpi_ps_get_opcode_info((*op)->common.aml_opcode); | |
582 | walk_state->opcode = (*op)->common.aml_opcode; | |
583 | ||
584 | status = walk_state->ascending_callback(walk_state); | |
585 | status = | |
586 | acpi_ps_next_parse_state(walk_state, *op, status); | |
587 | ||
588 | status2 = acpi_ps_complete_this_op(walk_state, *op); | |
589 | if (ACPI_FAILURE(status2)) { | |
590 | return_ACPI_STATUS(status2); | |
591 | } | |
592 | } | |
593 | ||
594 | status = AE_OK; | |
595 | break; | |
596 | ||
597 | case AE_CTRL_BREAK: | |
598 | case AE_CTRL_CONTINUE: | |
599 | ||
600 | /* Pop off scopes until we find the While */ | |
601 | ||
602 | while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) { | |
603 | acpi_ps_pop_scope(&(walk_state->parser_state), op, | |
604 | &walk_state->arg_types, | |
605 | &walk_state->arg_count); | |
4d0b4af9 MK |
606 | } |
607 | ||
608 | /* Close this iteration of the While loop */ | |
609 | ||
610 | walk_state->op = *op; | |
611 | walk_state->op_info = | |
612 | acpi_ps_get_opcode_info((*op)->common.aml_opcode); | |
613 | walk_state->opcode = (*op)->common.aml_opcode; | |
614 | ||
615 | status = walk_state->ascending_callback(walk_state); | |
616 | status = acpi_ps_next_parse_state(walk_state, *op, status); | |
617 | ||
618 | status2 = acpi_ps_complete_this_op(walk_state, *op); | |
619 | if (ACPI_FAILURE(status2)) { | |
620 | return_ACPI_STATUS(status2); | |
621 | } | |
622 | ||
623 | status = AE_OK; | |
624 | break; | |
625 | ||
626 | case AE_CTRL_TERMINATE: | |
627 | ||
628 | /* Clean up */ | |
629 | do { | |
630 | if (*op) { | |
631 | status2 = | |
632 | acpi_ps_complete_this_op(walk_state, *op); | |
633 | if (ACPI_FAILURE(status2)) { | |
634 | return_ACPI_STATUS(status2); | |
635 | } | |
4d0b4af9 MK |
636 | |
637 | acpi_ut_delete_generic_state | |
638 | (acpi_ut_pop_generic_state | |
639 | (&walk_state->control_state)); | |
640 | } | |
641 | ||
642 | acpi_ps_pop_scope(&(walk_state->parser_state), op, | |
643 | &walk_state->arg_types, | |
644 | &walk_state->arg_count); | |
645 | ||
646 | } while (*op); | |
647 | ||
648 | return_ACPI_STATUS(AE_OK); | |
649 | ||
650 | default: /* All other non-AE_OK status */ | |
651 | ||
652 | do { | |
653 | if (*op) { | |
654 | status2 = | |
655 | acpi_ps_complete_this_op(walk_state, *op); | |
656 | if (ACPI_FAILURE(status2)) { | |
657 | return_ACPI_STATUS(status2); | |
658 | } | |
659 | } | |
660 | ||
661 | acpi_ps_pop_scope(&(walk_state->parser_state), op, | |
662 | &walk_state->arg_types, | |
663 | &walk_state->arg_count); | |
664 | ||
665 | } while (*op); | |
666 | ||
667 | #if 0 | |
668 | /* | |
669 | * TBD: Cleanup parse ops on error | |
670 | */ | |
671 | if (*op == NULL) { | |
672 | acpi_ps_pop_scope(parser_state, op, | |
673 | &walk_state->arg_types, | |
674 | &walk_state->arg_count); | |
675 | } | |
676 | #endif | |
677 | walk_state->prev_op = NULL; | |
678 | walk_state->prev_arg_types = walk_state->arg_types; | |
679 | return_ACPI_STATUS(status); | |
680 | } | |
681 | ||
682 | /* This scope complete? */ | |
683 | ||
684 | if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) { | |
685 | acpi_ps_pop_scope(&(walk_state->parser_state), op, | |
686 | &walk_state->arg_types, | |
687 | &walk_state->arg_count); | |
688 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op)); | |
689 | } else { | |
690 | *op = NULL; | |
691 | } | |
692 | ||
693 | return_ACPI_STATUS(AE_OK); | |
694 | } | |
695 | ||
696 | /******************************************************************************* | |
697 | * | |
698 | * FUNCTION: acpi_ps_complete_final_op | |
699 | * | |
700 | * PARAMETERS: walk_state - Current state | |
701 | * Op - Current Op | |
702 | * Status - Current parse status before complete last | |
703 | * Op | |
704 | * | |
705 | * RETURN: Status | |
706 | * | |
707 | * DESCRIPTION: Complete last Op. | |
708 | * | |
709 | ******************************************************************************/ | |
710 | ||
711 | static acpi_status | |
712 | acpi_ps_complete_final_op(struct acpi_walk_state *walk_state, | |
713 | union acpi_parse_object *op, acpi_status status) | |
714 | { | |
715 | acpi_status status2; | |
716 | ||
717 | ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state); | |
718 | ||
719 | /* | |
720 | * Complete the last Op (if not completed), and clear the scope stack. | |
721 | * It is easily possible to end an AML "package" with an unbounded number | |
722 | * of open scopes (such as when several ASL blocks are closed with | |
723 | * sequential closing braces). We want to terminate each one cleanly. | |
724 | */ | |
725 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n", | |
726 | op)); | |
727 | do { | |
728 | if (op) { | |
729 | if (walk_state->ascending_callback != NULL) { | |
730 | walk_state->op = op; | |
731 | walk_state->op_info = | |
732 | acpi_ps_get_opcode_info(op->common. | |
733 | aml_opcode); | |
734 | walk_state->opcode = op->common.aml_opcode; | |
735 | ||
736 | status = | |
737 | walk_state->ascending_callback(walk_state); | |
738 | status = | |
739 | acpi_ps_next_parse_state(walk_state, op, | |
740 | status); | |
741 | if (status == AE_CTRL_PENDING) { | |
742 | status = | |
743 | acpi_ps_complete_op(walk_state, &op, | |
744 | AE_OK); | |
745 | if (ACPI_FAILURE(status)) { | |
746 | return_ACPI_STATUS(status); | |
747 | } | |
748 | } | |
749 | ||
750 | if (status == AE_CTRL_TERMINATE) { | |
751 | status = AE_OK; | |
752 | ||
753 | /* Clean up */ | |
754 | do { | |
755 | if (op) { | |
756 | status2 = | |
757 | acpi_ps_complete_this_op | |
758 | (walk_state, op); | |
759 | if (ACPI_FAILURE | |
760 | (status2)) { | |
761 | return_ACPI_STATUS | |
762 | (status2); | |
763 | } | |
764 | } | |
765 | ||
766 | acpi_ps_pop_scope(& | |
767 | (walk_state-> | |
768 | parser_state), | |
769 | &op, | |
770 | &walk_state-> | |
771 | arg_types, | |
772 | &walk_state-> | |
773 | arg_count); | |
774 | ||
775 | } while (op); | |
776 | ||
777 | return_ACPI_STATUS(status); | |
778 | } | |
779 | ||
780 | else if (ACPI_FAILURE(status)) { | |
781 | ||
782 | /* First error is most important */ | |
783 | ||
784 | (void) | |
785 | acpi_ps_complete_this_op(walk_state, | |
786 | op); | |
787 | return_ACPI_STATUS(status); | |
788 | } | |
789 | } | |
790 | ||
791 | status2 = acpi_ps_complete_this_op(walk_state, op); | |
792 | if (ACPI_FAILURE(status2)) { | |
793 | return_ACPI_STATUS(status2); | |
794 | } | |
795 | } | |
796 | ||
797 | acpi_ps_pop_scope(&(walk_state->parser_state), &op, | |
798 | &walk_state->arg_types, | |
799 | &walk_state->arg_count); | |
800 | ||
801 | } while (op); | |
802 | ||
803 | return_ACPI_STATUS(status); | |
804 | } | |
805 | ||
73459f73 RM |
806 | /******************************************************************************* |
807 | * | |
808 | * FUNCTION: acpi_ps_parse_loop | |
809 | * | |
810 | * PARAMETERS: walk_state - Current state | |
811 | * | |
812 | * RETURN: Status | |
813 | * | |
814 | * DESCRIPTION: Parse AML (pointed to by the current parser state) and return | |
815 | * a tree of ops. | |
816 | * | |
817 | ******************************************************************************/ | |
818 | ||
4be44fcd | 819 | acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state) |
73459f73 | 820 | { |
4be44fcd | 821 | acpi_status status = AE_OK; |
4be44fcd | 822 | union acpi_parse_object *op = NULL; /* current op */ |
4be44fcd LB |
823 | struct acpi_parse_state *parser_state; |
824 | u8 *aml_op_start = NULL; | |
73459f73 | 825 | |
b229cf92 | 826 | ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state); |
73459f73 RM |
827 | |
828 | if (walk_state->descending_callback == NULL) { | |
4be44fcd | 829 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
73459f73 RM |
830 | } |
831 | ||
832 | parser_state = &walk_state->parser_state; | |
833 | walk_state->arg_types = 0; | |
834 | ||
835 | #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) | |
836 | ||
837 | if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) { | |
52fc0b02 | 838 | |
73459f73 RM |
839 | /* We are restarting a preempted control method */ |
840 | ||
4be44fcd | 841 | if (acpi_ps_has_completed_scope(parser_state)) { |
73459f73 RM |
842 | /* |
843 | * We must check if a predicate to an IF or WHILE statement | |
844 | * was just completed | |
845 | */ | |
846 | if ((parser_state->scope->parse_scope.op) && | |
4be44fcd LB |
847 | ((parser_state->scope->parse_scope.op->common. |
848 | aml_opcode == AML_IF_OP) | |
849 | || (parser_state->scope->parse_scope.op->common. | |
850 | aml_opcode == AML_WHILE_OP)) | |
851 | && (walk_state->control_state) | |
852 | && (walk_state->control_state->common.state == | |
853 | ACPI_CONTROL_PREDICATE_EXECUTING)) { | |
73459f73 RM |
854 | /* |
855 | * A predicate was just completed, get the value of the | |
856 | * predicate and branch based on that value | |
857 | */ | |
858 | walk_state->op = NULL; | |
4be44fcd LB |
859 | status = |
860 | acpi_ds_get_predicate_value(walk_state, | |
861 | ACPI_TO_POINTER | |
862 | (TRUE)); | |
863 | if (ACPI_FAILURE(status) | |
864 | && ((status & AE_CODE_MASK) != | |
865 | AE_CODE_CONTROL)) { | |
73459f73 | 866 | if (status == AE_AML_NO_RETURN_VALUE) { |
b8e4d893 BM |
867 | ACPI_EXCEPTION((AE_INFO, status, |
868 | "Invoked method did not return a value")); | |
73459f73 RM |
869 | |
870 | } | |
4d0b4af9 | 871 | |
b8e4d893 | 872 | ACPI_EXCEPTION((AE_INFO, status, |
b229cf92 | 873 | "GetPredicate Failed")); |
4be44fcd | 874 | return_ACPI_STATUS(status); |
73459f73 RM |
875 | } |
876 | ||
4be44fcd LB |
877 | status = |
878 | acpi_ps_next_parse_state(walk_state, op, | |
879 | status); | |
73459f73 RM |
880 | } |
881 | ||
4be44fcd LB |
882 | acpi_ps_pop_scope(parser_state, &op, |
883 | &walk_state->arg_types, | |
884 | &walk_state->arg_count); | |
885 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
886 | "Popped scope, Op=%p\n", op)); | |
887 | } else if (walk_state->prev_op) { | |
52fc0b02 | 888 | |
73459f73 RM |
889 | /* We were in the middle of an op */ |
890 | ||
4d0b4af9 MK |
891 | op = walk_state->prev_op; |
892 | walk_state->arg_types = walk_state->prev_arg_types; | |
893 | } | |
894 | } | |
895 | #endif | |
73459f73 | 896 | |
4d0b4af9 | 897 | /* Iterative parsing loop, while there is more AML to process: */ |
73459f73 | 898 | |
4d0b4af9 MK |
899 | while ((parser_state->aml < parser_state->aml_end) || (op)) { |
900 | aml_op_start = parser_state->aml; | |
901 | if (!op) { | |
902 | status = | |
903 | acpi_ps_create_op(walk_state, aml_op_start, &op); | |
904 | if (ACPI_FAILURE(status)) { | |
905 | if (status == AE_CTRL_PARSE_CONTINUE) { | |
73459f73 RM |
906 | continue; |
907 | } | |
908 | ||
4d0b4af9 | 909 | if (status == AE_CTRL_PARSE_PENDING) { |
73459f73 | 910 | status = AE_OK; |
73459f73 RM |
911 | } |
912 | ||
4d0b4af9 MK |
913 | status = |
914 | acpi_ps_complete_op(walk_state, &op, | |
915 | status); | |
4be44fcd | 916 | if (ACPI_FAILURE(status)) { |
4d0b4af9 | 917 | return_ACPI_STATUS(status); |
73459f73 RM |
918 | } |
919 | ||
4d0b4af9 | 920 | continue; |
73459f73 RM |
921 | } |
922 | ||
923 | op->common.aml_offset = walk_state->aml_offset; | |
924 | ||
925 | if (walk_state->op_info) { | |
4be44fcd | 926 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 927 | "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n", |
4be44fcd LB |
928 | (u32) op->common.aml_opcode, |
929 | walk_state->op_info->name, op, | |
930 | parser_state->aml, | |
931 | op->common.aml_offset)); | |
73459f73 RM |
932 | } |
933 | } | |
934 | ||
73459f73 RM |
935 | /* |
936 | * Start arg_count at zero because we don't know if there are | |
937 | * any args yet | |
938 | */ | |
939 | walk_state->arg_count = 0; | |
940 | ||
941 | /* Are there any arguments that must be processed? */ | |
942 | ||
943 | if (walk_state->arg_types) { | |
52fc0b02 | 944 | |
73459f73 RM |
945 | /* Get arguments */ |
946 | ||
4d0b4af9 MK |
947 | status = |
948 | acpi_ps_get_arguments(walk_state, aml_op_start, op); | |
949 | if (ACPI_FAILURE(status)) { | |
4be44fcd | 950 | status = |
4d0b4af9 MK |
951 | acpi_ps_complete_op(walk_state, &op, |
952 | status); | |
4be44fcd | 953 | if (ACPI_FAILURE(status)) { |
4d0b4af9 | 954 | return_ACPI_STATUS(status); |
73459f73 | 955 | } |
73459f73 | 956 | |
4d0b4af9 | 957 | continue; |
73459f73 RM |
958 | } |
959 | } | |
960 | ||
961 | /* Check for arguments that need to be processed */ | |
962 | ||
963 | if (walk_state->arg_count) { | |
964 | /* | |
965 | * There are arguments (complex ones), push Op and | |
966 | * prepare for argument | |
967 | */ | |
4be44fcd LB |
968 | status = acpi_ps_push_scope(parser_state, op, |
969 | walk_state->arg_types, | |
970 | walk_state->arg_count); | |
971 | if (ACPI_FAILURE(status)) { | |
4d0b4af9 MK |
972 | status = |
973 | acpi_ps_complete_op(walk_state, &op, | |
974 | status); | |
975 | if (ACPI_FAILURE(status)) { | |
976 | return_ACPI_STATUS(status); | |
977 | } | |
978 | ||
979 | continue; | |
73459f73 | 980 | } |
4d0b4af9 | 981 | |
73459f73 RM |
982 | op = NULL; |
983 | continue; | |
984 | } | |
985 | ||
986 | /* | |
987 | * All arguments have been processed -- Op is complete, | |
988 | * prepare for next | |
989 | */ | |
4be44fcd LB |
990 | walk_state->op_info = |
991 | acpi_ps_get_opcode_info(op->common.aml_opcode); | |
73459f73 RM |
992 | if (walk_state->op_info->flags & AML_NAMED) { |
993 | if (acpi_gbl_depth) { | |
994 | acpi_gbl_depth--; | |
995 | } | |
996 | ||
997 | if (op->common.aml_opcode == AML_REGION_OP) { | |
998 | /* | |
999 | * Skip parsing of control method or opregion body, | |
1000 | * because we don't have enough info in the first pass | |
1001 | * to parse them correctly. | |
1002 | * | |
1003 | * Completed parsing an op_region declaration, we now | |
1004 | * know the length. | |
1005 | */ | |
4be44fcd LB |
1006 | op->named.length = |
1007 | (u32) (parser_state->aml - op->named.data); | |
73459f73 RM |
1008 | } |
1009 | } | |
1010 | ||
1011 | if (walk_state->op_info->flags & AML_CREATE) { | |
1012 | /* | |
1013 | * Backup to beginning of create_xXXfield declaration (1 for | |
1014 | * Opcode) | |
1015 | * | |
1016 | * body_length is unknown until we parse the body | |
1017 | */ | |
4be44fcd LB |
1018 | op->named.length = |
1019 | (u32) (parser_state->aml - op->named.data); | |
73459f73 RM |
1020 | } |
1021 | ||
1022 | /* This op complete, notify the dispatcher */ | |
1023 | ||
1024 | if (walk_state->ascending_callback != NULL) { | |
4be44fcd | 1025 | walk_state->op = op; |
73459f73 RM |
1026 | walk_state->opcode = op->common.aml_opcode; |
1027 | ||
4be44fcd LB |
1028 | status = walk_state->ascending_callback(walk_state); |
1029 | status = | |
1030 | acpi_ps_next_parse_state(walk_state, op, status); | |
73459f73 RM |
1031 | if (status == AE_CTRL_PENDING) { |
1032 | status = AE_OK; | |
73459f73 RM |
1033 | } |
1034 | } | |
1035 | ||
4d0b4af9 MK |
1036 | status = acpi_ps_complete_op(walk_state, &op, status); |
1037 | if (ACPI_FAILURE(status)) { | |
4be44fcd | 1038 | return_ACPI_STATUS(status); |
73459f73 RM |
1039 | } |
1040 | ||
4be44fcd | 1041 | } /* while parser_state->Aml */ |
73459f73 | 1042 | |
4d0b4af9 | 1043 | status = acpi_ps_complete_final_op(walk_state, op, status); |
4be44fcd | 1044 | return_ACPI_STATUS(status); |
73459f73 | 1045 | } |