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73459f73 RM |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psloop - Main AML parse loop | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, 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 RM |
44 | /* |
45 | * Parse the AML and build an operation tree as most interpreters, | |
46 | * like Perl, do. Parsing is done by hand rather than with a YACC | |
47 | * generated parser to tightly constrain stack and dynamic memory | |
48 | * usage. At the same time, parsing is kept flexible and the code | |
49 | * fairly compact by parsing based on a list of AML opcode | |
50 | * templates in aml_op_info[] | |
51 | */ | |
52 | ||
53 | #include <acpi/acpi.h> | |
54 | #include <acpi/acparser.h> | |
55 | #include <acpi/acdispat.h> | |
56 | #include <acpi/amlcode.h> | |
73459f73 RM |
57 | |
58 | #define _COMPONENT ACPI_PARSER | |
4be44fcd | 59 | ACPI_MODULE_NAME("psloop") |
73459f73 | 60 | |
4be44fcd | 61 | static u32 acpi_gbl_depth = 0; |
73459f73 RM |
62 | |
63 | /******************************************************************************* | |
64 | * | |
65 | * FUNCTION: acpi_ps_parse_loop | |
66 | * | |
67 | * PARAMETERS: walk_state - Current state | |
68 | * | |
69 | * RETURN: Status | |
70 | * | |
71 | * DESCRIPTION: Parse AML (pointed to by the current parser state) and return | |
72 | * a tree of ops. | |
73 | * | |
74 | ******************************************************************************/ | |
75 | ||
4be44fcd | 76 | acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state) |
73459f73 | 77 | { |
4be44fcd LB |
78 | acpi_status status = AE_OK; |
79 | acpi_status status2; | |
80 | union acpi_parse_object *op = NULL; /* current op */ | |
81 | union acpi_parse_object *arg = NULL; | |
82 | union acpi_parse_object *pre_op = NULL; | |
83 | struct acpi_parse_state *parser_state; | |
84 | u8 *aml_op_start = NULL; | |
73459f73 | 85 | |
4be44fcd | 86 | ACPI_FUNCTION_TRACE_PTR("ps_parse_loop", walk_state); |
73459f73 RM |
87 | |
88 | if (walk_state->descending_callback == NULL) { | |
4be44fcd | 89 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
73459f73 RM |
90 | } |
91 | ||
92 | parser_state = &walk_state->parser_state; | |
93 | walk_state->arg_types = 0; | |
94 | ||
95 | #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) | |
96 | ||
97 | if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) { | |
98 | /* We are restarting a preempted control method */ | |
99 | ||
4be44fcd | 100 | if (acpi_ps_has_completed_scope(parser_state)) { |
73459f73 RM |
101 | /* |
102 | * We must check if a predicate to an IF or WHILE statement | |
103 | * was just completed | |
104 | */ | |
105 | if ((parser_state->scope->parse_scope.op) && | |
4be44fcd LB |
106 | ((parser_state->scope->parse_scope.op->common. |
107 | aml_opcode == AML_IF_OP) | |
108 | || (parser_state->scope->parse_scope.op->common. | |
109 | aml_opcode == AML_WHILE_OP)) | |
110 | && (walk_state->control_state) | |
111 | && (walk_state->control_state->common.state == | |
112 | ACPI_CONTROL_PREDICATE_EXECUTING)) { | |
73459f73 RM |
113 | /* |
114 | * A predicate was just completed, get the value of the | |
115 | * predicate and branch based on that value | |
116 | */ | |
117 | walk_state->op = NULL; | |
4be44fcd LB |
118 | status = |
119 | acpi_ds_get_predicate_value(walk_state, | |
120 | ACPI_TO_POINTER | |
121 | (TRUE)); | |
122 | if (ACPI_FAILURE(status) | |
123 | && ((status & AE_CODE_MASK) != | |
124 | AE_CODE_CONTROL)) { | |
73459f73 | 125 | if (status == AE_AML_NO_RETURN_VALUE) { |
b8e4d893 BM |
126 | ACPI_EXCEPTION((AE_INFO, status, |
127 | "Invoked method did not return a value")); | |
73459f73 RM |
128 | |
129 | } | |
b8e4d893 BM |
130 | ACPI_EXCEPTION((AE_INFO, status, |
131 | "get_predicate Failed")); | |
4be44fcd | 132 | return_ACPI_STATUS(status); |
73459f73 RM |
133 | } |
134 | ||
4be44fcd LB |
135 | status = |
136 | acpi_ps_next_parse_state(walk_state, op, | |
137 | status); | |
73459f73 RM |
138 | } |
139 | ||
4be44fcd LB |
140 | acpi_ps_pop_scope(parser_state, &op, |
141 | &walk_state->arg_types, | |
142 | &walk_state->arg_count); | |
143 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
144 | "Popped scope, Op=%p\n", op)); | |
145 | } else if (walk_state->prev_op) { | |
73459f73 RM |
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 | ||
4be44fcd LB |
161 | walk_state->aml_offset = |
162 | (u32) ACPI_PTR_DIFF(parser_state->aml, | |
163 | parser_state->aml_start); | |
164 | walk_state->opcode = acpi_ps_peek_opcode(parser_state); | |
73459f73 RM |
165 | |
166 | /* | |
167 | * First cut to determine what we have found: | |
168 | * 1) A valid AML opcode | |
169 | * 2) A name string | |
170 | * 3) An unknown/invalid opcode | |
171 | */ | |
4be44fcd LB |
172 | walk_state->op_info = |
173 | acpi_ps_get_opcode_info(walk_state->opcode); | |
73459f73 RM |
174 | switch (walk_state->op_info->class) { |
175 | case AML_CLASS_ASCII: | |
176 | case AML_CLASS_PREFIX: | |
177 | /* | |
178 | * Starts with a valid prefix or ASCII char, this is a name | |
179 | * string. Convert the bare name string to a namepath. | |
180 | */ | |
181 | walk_state->opcode = AML_INT_NAMEPATH_OP; | |
182 | walk_state->arg_types = ARGP_NAMESTRING; | |
183 | break; | |
184 | ||
185 | case AML_CLASS_UNKNOWN: | |
186 | ||
187 | /* The opcode is unrecognized. Just skip unknown opcodes */ | |
188 | ||
b8e4d893 BM |
189 | ACPI_ERROR((AE_INFO, |
190 | "Found unknown opcode %X at AML address %p offset %X, ignoring", | |
191 | walk_state->opcode, | |
192 | parser_state->aml, | |
193 | walk_state->aml_offset)); | |
73459f73 | 194 | |
4be44fcd | 195 | ACPI_DUMP_BUFFER(parser_state->aml, 128); |
73459f73 RM |
196 | |
197 | /* Assume one-byte bad opcode */ | |
198 | ||
199 | parser_state->aml++; | |
200 | continue; | |
201 | ||
202 | default: | |
203 | ||
204 | /* Found opcode info, this is a normal opcode */ | |
205 | ||
4be44fcd LB |
206 | parser_state->aml += |
207 | acpi_ps_get_opcode_size(walk_state->opcode); | |
208 | walk_state->arg_types = | |
209 | walk_state->op_info->parse_args; | |
73459f73 RM |
210 | break; |
211 | } | |
212 | ||
213 | /* Create Op structure and append to parent's argument list */ | |
214 | ||
215 | if (walk_state->op_info->flags & AML_NAMED) { | |
216 | /* Allocate a new pre_op if necessary */ | |
217 | ||
218 | if (!pre_op) { | |
4be44fcd LB |
219 | pre_op = |
220 | acpi_ps_alloc_op(walk_state-> | |
221 | opcode); | |
73459f73 RM |
222 | if (!pre_op) { |
223 | status = AE_NO_MEMORY; | |
224 | goto close_this_op; | |
225 | } | |
226 | } | |
227 | ||
228 | pre_op->common.value.arg = NULL; | |
229 | pre_op->common.aml_opcode = walk_state->opcode; | |
230 | ||
231 | /* | |
232 | * Get and append arguments until we find the node that contains | |
233 | * the name (the type ARGP_NAME). | |
234 | */ | |
4be44fcd LB |
235 | while (GET_CURRENT_ARG_TYPE |
236 | (walk_state->arg_types) | |
237 | && | |
238 | (GET_CURRENT_ARG_TYPE | |
239 | (walk_state->arg_types) != ARGP_NAME)) { | |
240 | status = | |
241 | acpi_ps_get_next_arg(walk_state, | |
242 | parser_state, | |
243 | GET_CURRENT_ARG_TYPE | |
244 | (walk_state-> | |
245 | arg_types), | |
246 | &arg); | |
247 | if (ACPI_FAILURE(status)) { | |
73459f73 RM |
248 | goto close_this_op; |
249 | } | |
250 | ||
4be44fcd LB |
251 | acpi_ps_append_arg(pre_op, arg); |
252 | INCREMENT_ARG_LIST(walk_state-> | |
253 | arg_types); | |
73459f73 RM |
254 | } |
255 | ||
256 | /* | |
257 | * Make sure that we found a NAME and didn't run out of | |
258 | * arguments | |
259 | */ | |
4be44fcd LB |
260 | if (!GET_CURRENT_ARG_TYPE |
261 | (walk_state->arg_types)) { | |
73459f73 RM |
262 | status = AE_AML_NO_OPERAND; |
263 | goto close_this_op; | |
264 | } | |
265 | ||
266 | /* We know that this arg is a name, move to next arg */ | |
267 | ||
4be44fcd | 268 | INCREMENT_ARG_LIST(walk_state->arg_types); |
73459f73 RM |
269 | |
270 | /* | |
271 | * Find the object. This will either insert the object into | |
272 | * the namespace or simply look it up | |
273 | */ | |
274 | walk_state->op = NULL; | |
275 | ||
4be44fcd LB |
276 | status = |
277 | walk_state->descending_callback(walk_state, | |
278 | &op); | |
279 | if (ACPI_FAILURE(status)) { | |
b8e4d893 BM |
280 | ACPI_EXCEPTION((AE_INFO, status, |
281 | "During name lookup/catalog")); | |
73459f73 RM |
282 | goto close_this_op; |
283 | } | |
284 | ||
285 | if (!op) { | |
286 | continue; | |
287 | } | |
288 | ||
4be44fcd LB |
289 | status = |
290 | acpi_ps_next_parse_state(walk_state, op, | |
291 | status); | |
73459f73 RM |
292 | if (status == AE_CTRL_PENDING) { |
293 | status = AE_OK; | |
294 | goto close_this_op; | |
295 | } | |
296 | ||
4be44fcd | 297 | if (ACPI_FAILURE(status)) { |
73459f73 RM |
298 | goto close_this_op; |
299 | } | |
300 | ||
4be44fcd LB |
301 | acpi_ps_append_arg(op, |
302 | pre_op->common.value.arg); | |
73459f73 RM |
303 | acpi_gbl_depth++; |
304 | ||
305 | if (op->common.aml_opcode == AML_REGION_OP) { | |
306 | /* | |
307 | * Defer final parsing of an operation_region body, | |
308 | * because we don't have enough info in the first pass | |
309 | * to parse it correctly (i.e., there may be method | |
310 | * calls within the term_arg elements of the body.) | |
311 | * | |
312 | * However, we must continue parsing because | |
313 | * the opregion is not a standalone package -- | |
314 | * we don't know where the end is at this point. | |
315 | * | |
316 | * (Length is unknown until parse of the body complete) | |
317 | */ | |
4be44fcd LB |
318 | op->named.data = aml_op_start; |
319 | op->named.length = 0; | |
73459f73 | 320 | } |
4be44fcd | 321 | } else { |
73459f73 RM |
322 | /* Not a named opcode, just allocate Op and append to parent */ |
323 | ||
4be44fcd LB |
324 | walk_state->op_info = |
325 | acpi_ps_get_opcode_info(walk_state->opcode); | |
326 | op = acpi_ps_alloc_op(walk_state->opcode); | |
73459f73 RM |
327 | if (!op) { |
328 | status = AE_NO_MEMORY; | |
329 | goto close_this_op; | |
330 | } | |
331 | ||
332 | if (walk_state->op_info->flags & AML_CREATE) { | |
333 | /* | |
334 | * Backup to beginning of create_xXXfield declaration | |
335 | * body_length is unknown until we parse the body | |
336 | */ | |
4be44fcd LB |
337 | op->named.data = aml_op_start; |
338 | op->named.length = 0; | |
73459f73 RM |
339 | } |
340 | ||
4be44fcd LB |
341 | acpi_ps_append_arg(acpi_ps_get_parent_scope |
342 | (parser_state), op); | |
73459f73 RM |
343 | |
344 | if ((walk_state->descending_callback != NULL)) { | |
345 | /* | |
346 | * Find the object. This will either insert the object into | |
347 | * the namespace or simply look it up | |
348 | */ | |
349 | walk_state->op = op; | |
350 | ||
4be44fcd LB |
351 | status = |
352 | walk_state-> | |
353 | descending_callback(walk_state, | |
354 | &op); | |
355 | status = | |
356 | acpi_ps_next_parse_state(walk_state, | |
357 | op, | |
358 | status); | |
73459f73 RM |
359 | if (status == AE_CTRL_PENDING) { |
360 | status = AE_OK; | |
361 | goto close_this_op; | |
362 | } | |
363 | ||
4be44fcd | 364 | if (ACPI_FAILURE(status)) { |
73459f73 RM |
365 | goto close_this_op; |
366 | } | |
367 | } | |
368 | } | |
369 | ||
370 | op->common.aml_offset = walk_state->aml_offset; | |
371 | ||
372 | if (walk_state->op_info) { | |
4be44fcd LB |
373 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
374 | "Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n", | |
375 | (u32) op->common.aml_opcode, | |
376 | walk_state->op_info->name, op, | |
377 | parser_state->aml, | |
378 | op->common.aml_offset)); | |
73459f73 RM |
379 | } |
380 | } | |
381 | ||
73459f73 RM |
382 | /* |
383 | * Start arg_count at zero because we don't know if there are | |
384 | * any args yet | |
385 | */ | |
386 | walk_state->arg_count = 0; | |
387 | ||
388 | /* Are there any arguments that must be processed? */ | |
389 | ||
390 | if (walk_state->arg_types) { | |
391 | /* Get arguments */ | |
392 | ||
393 | switch (op->common.aml_opcode) { | |
4be44fcd LB |
394 | case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ |
395 | case AML_WORD_OP: /* AML_WORDDATA_ARG */ | |
396 | case AML_DWORD_OP: /* AML_DWORDATA_ARG */ | |
397 | case AML_QWORD_OP: /* AML_QWORDATA_ARG */ | |
398 | case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ | |
73459f73 RM |
399 | |
400 | /* Fill in constant or string argument directly */ | |
401 | ||
4be44fcd LB |
402 | acpi_ps_get_next_simple_arg(parser_state, |
403 | GET_CURRENT_ARG_TYPE | |
404 | (walk_state-> | |
405 | arg_types), op); | |
73459f73 RM |
406 | break; |
407 | ||
4be44fcd | 408 | case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ |
73459f73 | 409 | |
4be44fcd LB |
410 | status = |
411 | acpi_ps_get_next_namepath(walk_state, | |
412 | parser_state, op, | |
413 | 1); | |
414 | if (ACPI_FAILURE(status)) { | |
73459f73 RM |
415 | goto close_this_op; |
416 | } | |
417 | ||
418 | walk_state->arg_types = 0; | |
419 | break; | |
420 | ||
421 | default: | |
422 | /* | |
423 | * Op is not a constant or string, append each argument | |
424 | * to the Op | |
425 | */ | |
4be44fcd LB |
426 | while (GET_CURRENT_ARG_TYPE |
427 | (walk_state->arg_types) | |
428 | && !walk_state->arg_count) { | |
73459f73 | 429 | walk_state->aml_offset = (u32) |
4be44fcd LB |
430 | ACPI_PTR_DIFF(parser_state->aml, |
431 | parser_state-> | |
432 | aml_start); | |
433 | ||
434 | status = | |
435 | acpi_ps_get_next_arg(walk_state, | |
436 | parser_state, | |
437 | GET_CURRENT_ARG_TYPE | |
438 | (walk_state-> | |
439 | arg_types), | |
440 | &arg); | |
441 | if (ACPI_FAILURE(status)) { | |
73459f73 RM |
442 | goto close_this_op; |
443 | } | |
444 | ||
445 | if (arg) { | |
4be44fcd LB |
446 | arg->common.aml_offset = |
447 | walk_state->aml_offset; | |
448 | acpi_ps_append_arg(op, arg); | |
73459f73 | 449 | } |
4be44fcd LB |
450 | INCREMENT_ARG_LIST(walk_state-> |
451 | arg_types); | |
73459f73 RM |
452 | } |
453 | ||
454 | /* Special processing for certain opcodes */ | |
455 | ||
4be44fcd | 456 | /* TBD (remove): Temporary mechanism to disable this code if needed */ |
f9f4601f | 457 | |
0c9938cc | 458 | #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE |
f9f4601f | 459 | |
4be44fcd LB |
460 | if ((walk_state->pass_number <= |
461 | ACPI_IMODE_LOAD_PASS1) | |
462 | && | |
463 | ((walk_state-> | |
464 | parse_flags & ACPI_PARSE_DISASSEMBLE) == | |
465 | 0)) { | |
73459f73 RM |
466 | /* |
467 | * We want to skip If/Else/While constructs during Pass1 | |
468 | * because we want to actually conditionally execute the | |
469 | * code during Pass2. | |
470 | * | |
471 | * Except for disassembly, where we always want to | |
472 | * walk the If/Else/While packages | |
473 | */ | |
474 | switch (op->common.aml_opcode) { | |
475 | case AML_IF_OP: | |
476 | case AML_ELSE_OP: | |
477 | case AML_WHILE_OP: | |
478 | ||
4be44fcd LB |
479 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
480 | "Pass1: Skipping an If/Else/While body\n")); | |
0c9938cc | 481 | |
73459f73 RM |
482 | /* Skip body of if/else/while in pass 1 */ |
483 | ||
4be44fcd LB |
484 | parser_state->aml = |
485 | parser_state->pkg_end; | |
73459f73 RM |
486 | walk_state->arg_count = 0; |
487 | break; | |
488 | ||
489 | default: | |
490 | break; | |
491 | } | |
492 | } | |
f9f4601f | 493 | #endif |
73459f73 RM |
494 | switch (op->common.aml_opcode) { |
495 | case AML_METHOD_OP: | |
496 | ||
497 | /* | |
498 | * Skip parsing of control method | |
499 | * because we don't have enough info in the first pass | |
500 | * to parse it correctly. | |
501 | * | |
502 | * Save the length and address of the body | |
503 | */ | |
4be44fcd LB |
504 | op->named.data = parser_state->aml; |
505 | op->named.length = | |
506 | (u32) (parser_state->pkg_end - | |
507 | parser_state->aml); | |
73459f73 RM |
508 | |
509 | /* Skip body of method */ | |
510 | ||
4be44fcd LB |
511 | parser_state->aml = |
512 | parser_state->pkg_end; | |
73459f73 RM |
513 | walk_state->arg_count = 0; |
514 | break; | |
515 | ||
516 | case AML_BUFFER_OP: | |
517 | case AML_PACKAGE_OP: | |
518 | case AML_VAR_PACKAGE_OP: | |
519 | ||
520 | if ((op->common.parent) && | |
4be44fcd LB |
521 | (op->common.parent->common. |
522 | aml_opcode == AML_NAME_OP) | |
523 | && (walk_state->pass_number <= | |
524 | ACPI_IMODE_LOAD_PASS2)) { | |
73459f73 RM |
525 | /* |
526 | * Skip parsing of Buffers and Packages | |
527 | * because we don't have enough info in the first pass | |
528 | * to parse them correctly. | |
529 | */ | |
4be44fcd LB |
530 | op->named.data = aml_op_start; |
531 | op->named.length = | |
532 | (u32) (parser_state-> | |
533 | pkg_end - | |
534 | aml_op_start); | |
73459f73 RM |
535 | |
536 | /* Skip body */ | |
537 | ||
4be44fcd LB |
538 | parser_state->aml = |
539 | parser_state->pkg_end; | |
73459f73 RM |
540 | walk_state->arg_count = 0; |
541 | } | |
542 | break; | |
543 | ||
544 | case AML_WHILE_OP: | |
545 | ||
546 | if (walk_state->control_state) { | |
4be44fcd LB |
547 | walk_state->control_state-> |
548 | control.package_end = | |
549 | parser_state->pkg_end; | |
73459f73 RM |
550 | } |
551 | break; | |
552 | ||
553 | default: | |
554 | ||
555 | /* No action for all other opcodes */ | |
556 | break; | |
557 | } | |
558 | break; | |
559 | } | |
560 | } | |
561 | ||
562 | /* Check for arguments that need to be processed */ | |
563 | ||
564 | if (walk_state->arg_count) { | |
565 | /* | |
566 | * There are arguments (complex ones), push Op and | |
567 | * prepare for argument | |
568 | */ | |
4be44fcd LB |
569 | status = acpi_ps_push_scope(parser_state, op, |
570 | walk_state->arg_types, | |
571 | walk_state->arg_count); | |
572 | if (ACPI_FAILURE(status)) { | |
73459f73 RM |
573 | goto close_this_op; |
574 | } | |
575 | op = NULL; | |
576 | continue; | |
577 | } | |
578 | ||
579 | /* | |
580 | * All arguments have been processed -- Op is complete, | |
581 | * prepare for next | |
582 | */ | |
4be44fcd LB |
583 | walk_state->op_info = |
584 | acpi_ps_get_opcode_info(op->common.aml_opcode); | |
73459f73 RM |
585 | if (walk_state->op_info->flags & AML_NAMED) { |
586 | if (acpi_gbl_depth) { | |
587 | acpi_gbl_depth--; | |
588 | } | |
589 | ||
590 | if (op->common.aml_opcode == AML_REGION_OP) { | |
591 | /* | |
592 | * Skip parsing of control method or opregion body, | |
593 | * because we don't have enough info in the first pass | |
594 | * to parse them correctly. | |
595 | * | |
596 | * Completed parsing an op_region declaration, we now | |
597 | * know the length. | |
598 | */ | |
4be44fcd LB |
599 | op->named.length = |
600 | (u32) (parser_state->aml - op->named.data); | |
73459f73 RM |
601 | } |
602 | } | |
603 | ||
604 | if (walk_state->op_info->flags & AML_CREATE) { | |
605 | /* | |
606 | * Backup to beginning of create_xXXfield declaration (1 for | |
607 | * Opcode) | |
608 | * | |
609 | * body_length is unknown until we parse the body | |
610 | */ | |
4be44fcd LB |
611 | op->named.length = |
612 | (u32) (parser_state->aml - op->named.data); | |
73459f73 RM |
613 | } |
614 | ||
615 | /* This op complete, notify the dispatcher */ | |
616 | ||
617 | if (walk_state->ascending_callback != NULL) { | |
4be44fcd | 618 | walk_state->op = op; |
73459f73 RM |
619 | walk_state->opcode = op->common.aml_opcode; |
620 | ||
4be44fcd LB |
621 | status = walk_state->ascending_callback(walk_state); |
622 | status = | |
623 | acpi_ps_next_parse_state(walk_state, op, status); | |
73459f73 RM |
624 | if (status == AE_CTRL_PENDING) { |
625 | status = AE_OK; | |
626 | goto close_this_op; | |
627 | } | |
628 | } | |
629 | ||
4be44fcd | 630 | close_this_op: |
73459f73 RM |
631 | /* |
632 | * Finished one argument of the containing scope | |
633 | */ | |
634 | parser_state->scope->parse_scope.arg_count--; | |
635 | ||
636 | /* Finished with pre_op */ | |
637 | ||
638 | if (pre_op) { | |
4be44fcd | 639 | acpi_ps_free_op(pre_op); |
73459f73 RM |
640 | pre_op = NULL; |
641 | } | |
642 | ||
643 | /* Close this Op (will result in parse subtree deletion) */ | |
644 | ||
4be44fcd LB |
645 | status2 = acpi_ps_complete_this_op(walk_state, op); |
646 | if (ACPI_FAILURE(status2)) { | |
647 | return_ACPI_STATUS(status2); | |
73459f73 RM |
648 | } |
649 | op = NULL; | |
650 | ||
651 | switch (status) { | |
652 | case AE_OK: | |
653 | break; | |
654 | ||
73459f73 RM |
655 | case AE_CTRL_TRANSFER: |
656 | ||
657 | /* We are about to transfer to a called method. */ | |
658 | ||
659 | walk_state->prev_op = op; | |
660 | walk_state->prev_arg_types = walk_state->arg_types; | |
4be44fcd | 661 | return_ACPI_STATUS(status); |
73459f73 RM |
662 | |
663 | case AE_CTRL_END: | |
664 | ||
4be44fcd LB |
665 | acpi_ps_pop_scope(parser_state, &op, |
666 | &walk_state->arg_types, | |
667 | &walk_state->arg_count); | |
73459f73 RM |
668 | |
669 | if (op) { | |
4be44fcd LB |
670 | walk_state->op = op; |
671 | walk_state->op_info = | |
672 | acpi_ps_get_opcode_info(op->common. | |
673 | aml_opcode); | |
73459f73 RM |
674 | walk_state->opcode = op->common.aml_opcode; |
675 | ||
4be44fcd LB |
676 | status = |
677 | walk_state->ascending_callback(walk_state); | |
678 | status = | |
679 | acpi_ps_next_parse_state(walk_state, op, | |
680 | status); | |
73459f73 | 681 | |
4be44fcd LB |
682 | status2 = |
683 | acpi_ps_complete_this_op(walk_state, op); | |
684 | if (ACPI_FAILURE(status2)) { | |
685 | return_ACPI_STATUS(status2); | |
73459f73 RM |
686 | } |
687 | op = NULL; | |
688 | } | |
689 | status = AE_OK; | |
690 | break; | |
691 | ||
73459f73 RM |
692 | case AE_CTRL_BREAK: |
693 | case AE_CTRL_CONTINUE: | |
694 | ||
695 | /* Pop off scopes until we find the While */ | |
696 | ||
697 | while (!op || (op->common.aml_opcode != AML_WHILE_OP)) { | |
4be44fcd LB |
698 | acpi_ps_pop_scope(parser_state, &op, |
699 | &walk_state->arg_types, | |
700 | &walk_state->arg_count); | |
defba1d8 BM |
701 | |
702 | if (op->common.aml_opcode != AML_WHILE_OP) { | |
703 | status2 = | |
704 | acpi_ds_result_stack_pop | |
705 | (walk_state); | |
706 | if (ACPI_FAILURE(status2)) { | |
707 | return_ACPI_STATUS(status2); | |
708 | } | |
709 | } | |
73459f73 RM |
710 | } |
711 | ||
712 | /* Close this iteration of the While loop */ | |
713 | ||
4be44fcd LB |
714 | walk_state->op = op; |
715 | walk_state->op_info = | |
716 | acpi_ps_get_opcode_info(op->common.aml_opcode); | |
73459f73 RM |
717 | walk_state->opcode = op->common.aml_opcode; |
718 | ||
4be44fcd LB |
719 | status = walk_state->ascending_callback(walk_state); |
720 | status = | |
721 | acpi_ps_next_parse_state(walk_state, op, status); | |
73459f73 | 722 | |
4be44fcd LB |
723 | status2 = acpi_ps_complete_this_op(walk_state, op); |
724 | if (ACPI_FAILURE(status2)) { | |
725 | return_ACPI_STATUS(status2); | |
73459f73 RM |
726 | } |
727 | op = NULL; | |
728 | ||
729 | status = AE_OK; | |
730 | break; | |
731 | ||
73459f73 RM |
732 | case AE_CTRL_TERMINATE: |
733 | ||
734 | status = AE_OK; | |
735 | ||
736 | /* Clean up */ | |
737 | do { | |
738 | if (op) { | |
4be44fcd LB |
739 | status2 = |
740 | acpi_ps_complete_this_op(walk_state, | |
741 | op); | |
742 | if (ACPI_FAILURE(status2)) { | |
743 | return_ACPI_STATUS(status2); | |
73459f73 RM |
744 | } |
745 | } | |
4be44fcd LB |
746 | acpi_ps_pop_scope(parser_state, &op, |
747 | &walk_state->arg_types, | |
748 | &walk_state->arg_count); | |
73459f73 RM |
749 | |
750 | } while (op); | |
751 | ||
4be44fcd | 752 | return_ACPI_STATUS(status); |
73459f73 | 753 | |
4be44fcd | 754 | default: /* All other non-AE_OK status */ |
73459f73 RM |
755 | |
756 | do { | |
757 | if (op) { | |
4be44fcd LB |
758 | status2 = |
759 | acpi_ps_complete_this_op(walk_state, | |
760 | op); | |
761 | if (ACPI_FAILURE(status2)) { | |
762 | return_ACPI_STATUS(status2); | |
73459f73 RM |
763 | } |
764 | } | |
4be44fcd LB |
765 | acpi_ps_pop_scope(parser_state, &op, |
766 | &walk_state->arg_types, | |
767 | &walk_state->arg_count); | |
73459f73 RM |
768 | |
769 | } while (op); | |
770 | ||
73459f73 RM |
771 | /* |
772 | * TBD: Cleanup parse ops on error | |
773 | */ | |
774 | #if 0 | |
775 | if (op == NULL) { | |
4be44fcd LB |
776 | acpi_ps_pop_scope(parser_state, &op, |
777 | &walk_state->arg_types, | |
778 | &walk_state->arg_count); | |
73459f73 RM |
779 | } |
780 | #endif | |
781 | walk_state->prev_op = op; | |
782 | walk_state->prev_arg_types = walk_state->arg_types; | |
4be44fcd | 783 | return_ACPI_STATUS(status); |
73459f73 RM |
784 | } |
785 | ||
786 | /* This scope complete? */ | |
787 | ||
4be44fcd LB |
788 | if (acpi_ps_has_completed_scope(parser_state)) { |
789 | acpi_ps_pop_scope(parser_state, &op, | |
790 | &walk_state->arg_types, | |
791 | &walk_state->arg_count); | |
792 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
793 | "Popped scope, Op=%p\n", op)); | |
794 | } else { | |
73459f73 RM |
795 | op = NULL; |
796 | } | |
797 | ||
4be44fcd | 798 | } /* while parser_state->Aml */ |
73459f73 RM |
799 | |
800 | /* | |
801 | * Complete the last Op (if not completed), and clear the scope stack. | |
802 | * It is easily possible to end an AML "package" with an unbounded number | |
803 | * of open scopes (such as when several ASL blocks are closed with | |
804 | * sequential closing braces). We want to terminate each one cleanly. | |
805 | */ | |
4be44fcd LB |
806 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n", |
807 | op)); | |
73459f73 RM |
808 | do { |
809 | if (op) { | |
810 | if (walk_state->ascending_callback != NULL) { | |
4be44fcd LB |
811 | walk_state->op = op; |
812 | walk_state->op_info = | |
813 | acpi_ps_get_opcode_info(op->common. | |
814 | aml_opcode); | |
73459f73 RM |
815 | walk_state->opcode = op->common.aml_opcode; |
816 | ||
4be44fcd LB |
817 | status = |
818 | walk_state->ascending_callback(walk_state); | |
819 | status = | |
820 | acpi_ps_next_parse_state(walk_state, op, | |
821 | status); | |
73459f73 RM |
822 | if (status == AE_CTRL_PENDING) { |
823 | status = AE_OK; | |
824 | goto close_this_op; | |
825 | } | |
826 | ||
827 | if (status == AE_CTRL_TERMINATE) { | |
828 | status = AE_OK; | |
829 | ||
830 | /* Clean up */ | |
831 | do { | |
832 | if (op) { | |
4be44fcd LB |
833 | status2 = |
834 | acpi_ps_complete_this_op | |
835 | (walk_state, op); | |
836 | if (ACPI_FAILURE | |
837 | (status2)) { | |
838 | return_ACPI_STATUS | |
839 | (status2); | |
73459f73 RM |
840 | } |
841 | } | |
842 | ||
4be44fcd LB |
843 | acpi_ps_pop_scope(parser_state, |
844 | &op, | |
845 | &walk_state-> | |
846 | arg_types, | |
847 | &walk_state-> | |
848 | arg_count); | |
73459f73 RM |
849 | |
850 | } while (op); | |
851 | ||
4be44fcd | 852 | return_ACPI_STATUS(status); |
73459f73 RM |
853 | } |
854 | ||
4be44fcd | 855 | else if (ACPI_FAILURE(status)) { |
73459f73 RM |
856 | /* First error is most important */ |
857 | ||
4be44fcd LB |
858 | (void) |
859 | acpi_ps_complete_this_op(walk_state, | |
860 | op); | |
861 | return_ACPI_STATUS(status); | |
73459f73 RM |
862 | } |
863 | } | |
864 | ||
4be44fcd LB |
865 | status2 = acpi_ps_complete_this_op(walk_state, op); |
866 | if (ACPI_FAILURE(status2)) { | |
867 | return_ACPI_STATUS(status2); | |
73459f73 RM |
868 | } |
869 | } | |
870 | ||
4be44fcd LB |
871 | acpi_ps_pop_scope(parser_state, &op, &walk_state->arg_types, |
872 | &walk_state->arg_count); | |
73459f73 RM |
873 | |
874 | } while (op); | |
875 | ||
4be44fcd | 876 | return_ACPI_STATUS(status); |
73459f73 | 877 | } |