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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: nsaccess - Top-level functions for accessing ACPI namespace | |
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 | #include <acpi/acpi.h> | |
46 | #include <acpi/amlcode.h> | |
47 | #include <acpi/acnamesp.h> | |
48 | #include <acpi/acdispat.h> | |
49 | ||
50 | ||
51 | #define _COMPONENT ACPI_NAMESPACE | |
52 | ACPI_MODULE_NAME ("nsaccess") | |
53 | ||
54 | ||
55 | /******************************************************************************* | |
56 | * | |
57 | * FUNCTION: acpi_ns_root_initialize | |
58 | * | |
59 | * PARAMETERS: None | |
60 | * | |
61 | * RETURN: Status | |
62 | * | |
63 | * DESCRIPTION: Allocate and initialize the default root named objects | |
64 | * | |
65 | * MUTEX: Locks namespace for entire execution | |
66 | * | |
67 | ******************************************************************************/ | |
68 | ||
69 | acpi_status | |
44f6c012 RM |
70 | acpi_ns_root_initialize ( |
71 | void) | |
1da177e4 LT |
72 | { |
73 | acpi_status status; | |
74 | const struct acpi_predefined_names *init_val = NULL; | |
75 | struct acpi_namespace_node *new_node; | |
76 | union acpi_operand_object *obj_desc; | |
77 | acpi_string val = NULL; | |
78 | ||
79 | ||
80 | ACPI_FUNCTION_TRACE ("ns_root_initialize"); | |
81 | ||
82 | ||
83 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
84 | if (ACPI_FAILURE (status)) { | |
85 | return_ACPI_STATUS (status); | |
86 | } | |
87 | ||
88 | /* | |
89 | * The global root ptr is initially NULL, so a non-NULL value indicates | |
90 | * that acpi_ns_root_initialize() has already been called; just return. | |
91 | */ | |
92 | if (acpi_gbl_root_node) { | |
93 | status = AE_OK; | |
94 | goto unlock_and_exit; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Tell the rest of the subsystem that the root is initialized | |
99 | * (This is OK because the namespace is locked) | |
100 | */ | |
101 | acpi_gbl_root_node = &acpi_gbl_root_node_struct; | |
102 | ||
103 | /* Enter the pre-defined names in the name table */ | |
104 | ||
105 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, | |
106 | "Entering predefined entries into namespace\n")); | |
107 | ||
108 | for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) { | |
109 | /* _OSI is optional for now, will be permanent later */ | |
110 | ||
111 | if (!ACPI_STRCMP (init_val->name, "_OSI") && !acpi_gbl_create_osi_method) { | |
112 | continue; | |
113 | } | |
114 | ||
115 | status = acpi_ns_lookup (NULL, init_val->name, init_val->type, | |
116 | ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH, | |
117 | NULL, &new_node); | |
118 | ||
119 | if (ACPI_FAILURE (status) || (!new_node)) /* Must be on same line for code converter */ { | |
120 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
121 | "Could not create predefined name %s, %s\n", | |
122 | init_val->name, acpi_format_exception (status))); | |
123 | } | |
124 | ||
125 | /* | |
126 | * Name entered successfully. | |
127 | * If entry in pre_defined_names[] specifies an | |
128 | * initial value, create the initial value. | |
129 | */ | |
130 | if (init_val->val) { | |
131 | status = acpi_os_predefined_override (init_val, &val); | |
132 | if (ACPI_FAILURE (status)) { | |
133 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
134 | "Could not override predefined %s\n", | |
135 | init_val->name)); | |
136 | } | |
137 | ||
138 | if (!val) { | |
139 | val = init_val->val; | |
140 | } | |
141 | ||
142 | /* | |
143 | * Entry requests an initial value, allocate a | |
144 | * descriptor for it. | |
145 | */ | |
146 | obj_desc = acpi_ut_create_internal_object (init_val->type); | |
147 | if (!obj_desc) { | |
148 | status = AE_NO_MEMORY; | |
149 | goto unlock_and_exit; | |
150 | } | |
151 | ||
152 | /* | |
153 | * Convert value string from table entry to | |
154 | * internal representation. Only types actually | |
155 | * used for initial values are implemented here. | |
156 | */ | |
157 | switch (init_val->type) { | |
158 | case ACPI_TYPE_METHOD: | |
159 | obj_desc->method.param_count = (u8) ACPI_TO_INTEGER (val); | |
160 | obj_desc->common.flags |= AOPOBJ_DATA_VALID; | |
161 | ||
73459f73 | 162 | #if defined (ACPI_ASL_COMPILER) || defined (ACPI_DUMP_App) |
1da177e4 LT |
163 | |
164 | /* | |
165 | * i_aSL Compiler cheats by putting parameter count | |
f9f4601f | 166 | * in the owner_iD (param_count max is 7) |
1da177e4 LT |
167 | */ |
168 | new_node->owner_id = obj_desc->method.param_count; | |
169 | #else | |
170 | /* Mark this as a very SPECIAL method */ | |
171 | ||
172 | obj_desc->method.method_flags = AML_METHOD_INTERNAL_ONLY; | |
173 | obj_desc->method.implementation = acpi_ut_osi_implementation; | |
174 | #endif | |
175 | break; | |
176 | ||
177 | case ACPI_TYPE_INTEGER: | |
178 | ||
179 | obj_desc->integer.value = ACPI_TO_INTEGER (val); | |
180 | break; | |
181 | ||
182 | ||
183 | case ACPI_TYPE_STRING: | |
184 | ||
185 | /* | |
186 | * Build an object around the static string | |
187 | */ | |
188 | obj_desc->string.length = (u32) ACPI_STRLEN (val); | |
189 | obj_desc->string.pointer = val; | |
190 | obj_desc->common.flags |= AOPOBJ_STATIC_POINTER; | |
191 | break; | |
192 | ||
193 | ||
194 | case ACPI_TYPE_MUTEX: | |
195 | ||
196 | obj_desc->mutex.node = new_node; | |
197 | obj_desc->mutex.sync_level = (u8) (ACPI_TO_INTEGER (val) - 1); | |
198 | ||
199 | if (ACPI_STRCMP (init_val->name, "_GL_") == 0) { | |
200 | /* | |
201 | * Create a counting semaphore for the | |
202 | * global lock | |
203 | */ | |
204 | status = acpi_os_create_semaphore (ACPI_NO_UNIT_LIMIT, | |
205 | 1, &obj_desc->mutex.semaphore); | |
206 | if (ACPI_FAILURE (status)) { | |
207 | acpi_ut_remove_reference (obj_desc); | |
208 | goto unlock_and_exit; | |
209 | } | |
210 | ||
211 | /* | |
212 | * We just created the mutex for the | |
213 | * global lock, save it | |
214 | */ | |
215 | acpi_gbl_global_lock_semaphore = obj_desc->mutex.semaphore; | |
216 | } | |
217 | else { | |
218 | /* Create a mutex */ | |
219 | ||
220 | status = acpi_os_create_semaphore (1, 1, | |
221 | &obj_desc->mutex.semaphore); | |
222 | if (ACPI_FAILURE (status)) { | |
223 | acpi_ut_remove_reference (obj_desc); | |
224 | goto unlock_and_exit; | |
225 | } | |
226 | } | |
227 | break; | |
228 | ||
229 | ||
230 | default: | |
231 | ||
232 | ACPI_REPORT_ERROR (("Unsupported initial type value %X\n", | |
233 | init_val->type)); | |
234 | acpi_ut_remove_reference (obj_desc); | |
235 | obj_desc = NULL; | |
236 | continue; | |
237 | } | |
238 | ||
239 | /* Store pointer to value descriptor in the Node */ | |
240 | ||
241 | status = acpi_ns_attach_object (new_node, obj_desc, | |
242 | ACPI_GET_OBJECT_TYPE (obj_desc)); | |
243 | ||
244 | /* Remove local reference to the object */ | |
245 | ||
246 | acpi_ut_remove_reference (obj_desc); | |
247 | } | |
248 | } | |
249 | ||
250 | ||
251 | unlock_and_exit: | |
252 | (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
253 | ||
254 | /* Save a handle to "_GPE", it is always present */ | |
255 | ||
256 | if (ACPI_SUCCESS (status)) { | |
257 | status = acpi_ns_get_node_by_path ("\\_GPE", NULL, ACPI_NS_NO_UPSEARCH, | |
258 | &acpi_gbl_fadt_gpe_device); | |
259 | } | |
260 | ||
261 | return_ACPI_STATUS (status); | |
262 | } | |
263 | ||
264 | ||
265 | /******************************************************************************* | |
266 | * | |
267 | * FUNCTION: acpi_ns_lookup | |
268 | * | |
44f6c012 | 269 | * PARAMETERS: scope_info - Current scope info block |
1da177e4 LT |
270 | * Pathname - Search pathname, in internal format |
271 | * (as represented in the AML stream) | |
272 | * Type - Type associated with name | |
273 | * interpreter_mode - IMODE_LOAD_PASS2 => add name if not found | |
274 | * Flags - Flags describing the search restrictions | |
275 | * walk_state - Current state of the walk | |
276 | * return_node - Where the Node is placed (if found | |
277 | * or created successfully) | |
278 | * | |
279 | * RETURN: Status | |
280 | * | |
281 | * DESCRIPTION: Find or enter the passed name in the name space. | |
282 | * Log an error if name not found in Exec mode. | |
283 | * | |
284 | * MUTEX: Assumes namespace is locked. | |
285 | * | |
286 | ******************************************************************************/ | |
287 | ||
288 | acpi_status | |
289 | acpi_ns_lookup ( | |
290 | union acpi_generic_state *scope_info, | |
291 | char *pathname, | |
292 | acpi_object_type type, | |
293 | acpi_interpreter_mode interpreter_mode, | |
294 | u32 flags, | |
295 | struct acpi_walk_state *walk_state, | |
296 | struct acpi_namespace_node **return_node) | |
297 | { | |
298 | acpi_status status; | |
299 | char *path = pathname; | |
300 | struct acpi_namespace_node *prefix_node; | |
301 | struct acpi_namespace_node *current_node = NULL; | |
302 | struct acpi_namespace_node *this_node = NULL; | |
303 | u32 num_segments; | |
304 | u32 num_carats; | |
305 | acpi_name simple_name; | |
306 | acpi_object_type type_to_check_for; | |
307 | acpi_object_type this_search_type; | |
308 | u32 search_parent_flag = ACPI_NS_SEARCH_PARENT; | |
309 | u32 local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND | | |
310 | ACPI_NS_SEARCH_PARENT); | |
311 | ||
312 | ||
313 | ACPI_FUNCTION_TRACE ("ns_lookup"); | |
314 | ||
315 | ||
316 | if (!return_node) { | |
317 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
318 | } | |
319 | ||
320 | acpi_gbl_ns_lookup_count++; | |
321 | *return_node = ACPI_ENTRY_NOT_FOUND; | |
322 | ||
323 | if (!acpi_gbl_root_node) { | |
324 | return_ACPI_STATUS (AE_NO_NAMESPACE); | |
325 | } | |
326 | ||
327 | /* | |
328 | * Get the prefix scope. | |
329 | * A null scope means use the root scope | |
330 | */ | |
331 | if ((!scope_info) || | |
332 | (!scope_info->scope.node)) { | |
333 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
334 | "Null scope prefix, using root node (%p)\n", | |
335 | acpi_gbl_root_node)); | |
336 | ||
337 | prefix_node = acpi_gbl_root_node; | |
338 | } | |
339 | else { | |
340 | prefix_node = scope_info->scope.node; | |
341 | if (ACPI_GET_DESCRIPTOR_TYPE (prefix_node) != ACPI_DESC_TYPE_NAMED) { | |
342 | ACPI_REPORT_ERROR (("ns_lookup: %p is not a namespace node [%s]\n", | |
343 | prefix_node, acpi_ut_get_descriptor_name (prefix_node))); | |
344 | return_ACPI_STATUS (AE_AML_INTERNAL); | |
345 | } | |
346 | ||
347 | /* | |
348 | * This node might not be a actual "scope" node (such as a | |
349 | * Device/Method, etc.) It could be a Package or other object node. | |
350 | * Backup up the tree to find the containing scope node. | |
351 | */ | |
352 | while (!acpi_ns_opens_scope (prefix_node->type) && | |
353 | prefix_node->type != ACPI_TYPE_ANY) { | |
354 | prefix_node = acpi_ns_get_parent_node (prefix_node); | |
355 | } | |
356 | } | |
357 | ||
358 | /* Save type TBD: may be no longer necessary */ | |
359 | ||
360 | type_to_check_for = type; | |
361 | ||
362 | /* | |
363 | * Begin examination of the actual pathname | |
364 | */ | |
365 | if (!pathname) { | |
366 | /* A Null name_path is allowed and refers to the root */ | |
367 | ||
368 | num_segments = 0; | |
369 | this_node = acpi_gbl_root_node; | |
370 | path = ""; | |
371 | ||
372 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
373 | "Null Pathname (Zero segments), Flags=%X\n", flags)); | |
374 | } | |
375 | else { | |
376 | /* | |
377 | * Name pointer is valid (and must be in internal name format) | |
378 | * | |
379 | * Check for scope prefixes: | |
380 | * | |
381 | * As represented in the AML stream, a namepath consists of an | |
382 | * optional scope prefix followed by a name segment part. | |
383 | * | |
384 | * If present, the scope prefix is either a Root Prefix (in | |
385 | * which case the name is fully qualified), or one or more | |
386 | * Parent Prefixes (in which case the name's scope is relative | |
387 | * to the current scope). | |
388 | */ | |
389 | if (*path == (u8) AML_ROOT_PREFIX) { | |
390 | /* Pathname is fully qualified, start from the root */ | |
391 | ||
392 | this_node = acpi_gbl_root_node; | |
393 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
394 | ||
395 | /* Point to name segment part */ | |
396 | ||
397 | path++; | |
398 | ||
399 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
400 | "Path is absolute from root [%p]\n", this_node)); | |
401 | } | |
402 | else { | |
403 | /* Pathname is relative to current scope, start there */ | |
404 | ||
405 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
406 | "Searching relative to prefix scope [%4.4s] (%p)\n", | |
407 | acpi_ut_get_node_name (prefix_node), prefix_node)); | |
408 | ||
409 | /* | |
410 | * Handle multiple Parent Prefixes (carat) by just getting | |
411 | * the parent node for each prefix instance. | |
412 | */ | |
413 | this_node = prefix_node; | |
414 | num_carats = 0; | |
415 | while (*path == (u8) AML_PARENT_PREFIX) { | |
416 | /* Name is fully qualified, no search rules apply */ | |
417 | ||
418 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
419 | /* | |
420 | * Point past this prefix to the name segment | |
421 | * part or the next Parent Prefix | |
422 | */ | |
423 | path++; | |
424 | ||
425 | /* Backup to the parent node */ | |
426 | ||
427 | num_carats++; | |
428 | this_node = acpi_ns_get_parent_node (this_node); | |
429 | if (!this_node) { | |
430 | /* Current scope has no parent scope */ | |
431 | ||
432 | ACPI_REPORT_ERROR ( | |
433 | ("ACPI path has too many parent prefixes (^) - reached beyond root node\n")); | |
434 | return_ACPI_STATUS (AE_NOT_FOUND); | |
435 | } | |
436 | } | |
437 | ||
438 | if (search_parent_flag == ACPI_NS_NO_UPSEARCH) { | |
439 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
440 | "Search scope is [%4.4s], path has %d carat(s)\n", | |
441 | acpi_ut_get_node_name (this_node), num_carats)); | |
442 | } | |
443 | } | |
444 | ||
445 | /* | |
446 | * Determine the number of ACPI name segments in this pathname. | |
447 | * | |
448 | * The segment part consists of either: | |
449 | * - A Null name segment (0) | |
450 | * - A dual_name_prefix followed by two 4-byte name segments | |
451 | * - A multi_name_prefix followed by a byte indicating the | |
452 | * number of segments and the segments themselves. | |
453 | * - A single 4-byte name segment | |
454 | * | |
455 | * Examine the name prefix opcode, if any, to determine the number of | |
456 | * segments. | |
457 | */ | |
458 | switch (*path) { | |
459 | case 0: | |
460 | /* | |
461 | * Null name after a root or parent prefixes. We already | |
462 | * have the correct target node and there are no name segments. | |
463 | */ | |
464 | num_segments = 0; | |
465 | type = this_node->type; | |
466 | ||
467 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
468 | "Prefix-only Pathname (Zero name segments), Flags=%X\n", | |
469 | flags)); | |
470 | break; | |
471 | ||
472 | case AML_DUAL_NAME_PREFIX: | |
473 | ||
474 | /* More than one name_seg, search rules do not apply */ | |
475 | ||
476 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
477 | ||
478 | /* Two segments, point to first name segment */ | |
479 | ||
480 | num_segments = 2; | |
481 | path++; | |
482 | ||
483 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
484 | "Dual Pathname (2 segments, Flags=%X)\n", flags)); | |
485 | break; | |
486 | ||
487 | case AML_MULTI_NAME_PREFIX_OP: | |
488 | ||
489 | /* More than one name_seg, search rules do not apply */ | |
490 | ||
491 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
492 | ||
493 | /* Extract segment count, point to first name segment */ | |
494 | ||
495 | path++; | |
496 | num_segments = (u32) (u8) *path; | |
497 | path++; | |
498 | ||
499 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
500 | "Multi Pathname (%d Segments, Flags=%X) \n", | |
501 | num_segments, flags)); | |
502 | break; | |
503 | ||
504 | default: | |
505 | /* | |
506 | * Not a Null name, no Dual or Multi prefix, hence there is | |
507 | * only one name segment and Pathname is already pointing to it. | |
508 | */ | |
509 | num_segments = 1; | |
510 | ||
511 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
512 | "Simple Pathname (1 segment, Flags=%X)\n", flags)); | |
513 | break; | |
514 | } | |
515 | ||
516 | ACPI_DEBUG_EXEC (acpi_ns_print_pathname (num_segments, path)); | |
517 | } | |
518 | ||
519 | ||
520 | /* | |
521 | * Search namespace for each segment of the name. Loop through and | |
522 | * verify (or add to the namespace) each name segment. | |
523 | * | |
524 | * The object type is significant only at the last name | |
525 | * segment. (We don't care about the types along the path, only | |
526 | * the type of the final target object.) | |
527 | */ | |
528 | this_search_type = ACPI_TYPE_ANY; | |
529 | current_node = this_node; | |
530 | while (num_segments && current_node) { | |
531 | num_segments--; | |
532 | if (!num_segments) { | |
533 | /* | |
534 | * This is the last segment, enable typechecking | |
535 | */ | |
536 | this_search_type = type; | |
537 | ||
538 | /* | |
539 | * Only allow automatic parent search (search rules) if the caller | |
540 | * requested it AND we have a single, non-fully-qualified name_seg | |
541 | */ | |
542 | if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) && | |
543 | (flags & ACPI_NS_SEARCH_PARENT)) { | |
544 | local_flags |= ACPI_NS_SEARCH_PARENT; | |
545 | } | |
546 | ||
547 | /* Set error flag according to caller */ | |
548 | ||
549 | if (flags & ACPI_NS_ERROR_IF_FOUND) { | |
550 | local_flags |= ACPI_NS_ERROR_IF_FOUND; | |
551 | } | |
552 | } | |
553 | ||
554 | /* Extract one ACPI name from the front of the pathname */ | |
555 | ||
556 | ACPI_MOVE_32_TO_32 (&simple_name, path); | |
557 | ||
558 | /* Try to find the single (4 character) ACPI name */ | |
559 | ||
560 | status = acpi_ns_search_and_enter (simple_name, walk_state, current_node, | |
561 | interpreter_mode, this_search_type, local_flags, &this_node); | |
562 | if (ACPI_FAILURE (status)) { | |
563 | if (status == AE_NOT_FOUND) { | |
564 | /* Name not found in ACPI namespace */ | |
565 | ||
566 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
567 | "Name [%4.4s] not found in scope [%4.4s] %p\n", | |
568 | (char *) &simple_name, (char *) ¤t_node->name, | |
569 | current_node)); | |
570 | } | |
571 | ||
572 | *return_node = this_node; | |
573 | return_ACPI_STATUS (status); | |
574 | } | |
575 | ||
576 | /* | |
577 | * Sanity typecheck of the target object: | |
578 | * | |
579 | * If 1) This is the last segment (num_segments == 0) | |
580 | * 2) And we are looking for a specific type | |
581 | * (Not checking for TYPE_ANY) | |
582 | * 3) Which is not an alias | |
583 | * 4) Which is not a local type (TYPE_SCOPE) | |
584 | * 5) And the type of target object is known (not TYPE_ANY) | |
585 | * 6) And target object does not match what we are looking for | |
586 | * | |
587 | * Then we have a type mismatch. Just warn and ignore it. | |
588 | */ | |
589 | if ((num_segments == 0) && | |
590 | (type_to_check_for != ACPI_TYPE_ANY) && | |
591 | (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) && | |
592 | (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS) && | |
593 | (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE) && | |
594 | (this_node->type != ACPI_TYPE_ANY) && | |
595 | (this_node->type != type_to_check_for)) { | |
596 | /* Complain about a type mismatch */ | |
597 | ||
598 | ACPI_REPORT_WARNING ( | |
599 | ("ns_lookup: Type mismatch on %4.4s (%s), searching for (%s)\n", | |
600 | (char *) &simple_name, acpi_ut_get_type_name (this_node->type), | |
601 | acpi_ut_get_type_name (type_to_check_for))); | |
602 | } | |
603 | ||
604 | /* | |
605 | * If this is the last name segment and we are not looking for a | |
606 | * specific type, but the type of found object is known, use that type | |
607 | * to see if it opens a scope. | |
608 | */ | |
609 | if ((num_segments == 0) && (type == ACPI_TYPE_ANY)) { | |
610 | type = this_node->type; | |
611 | } | |
612 | ||
613 | /* Point to next name segment and make this node current */ | |
614 | ||
615 | path += ACPI_NAME_SIZE; | |
616 | current_node = this_node; | |
617 | } | |
618 | ||
619 | /* | |
620 | * Always check if we need to open a new scope | |
621 | */ | |
622 | if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) { | |
623 | /* | |
624 | * If entry is a type which opens a scope, push the new scope on the | |
625 | * scope stack. | |
626 | */ | |
627 | if (acpi_ns_opens_scope (type)) { | |
628 | status = acpi_ds_scope_stack_push (this_node, type, walk_state); | |
629 | if (ACPI_FAILURE (status)) { | |
630 | return_ACPI_STATUS (status); | |
631 | } | |
632 | } | |
633 | } | |
634 | ||
635 | *return_node = this_node; | |
636 | return_ACPI_STATUS (AE_OK); | |
637 | } | |
638 |