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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: nsaccess - Top-level functions for accessing ACPI namespace | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/amlcode.h> | |
46 | #include <acpi/acnamesp.h> | |
47 | #include <acpi/acdispat.h> | |
48 | ||
1da177e4 | 49 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 50 | ACPI_MODULE_NAME("nsaccess") |
1da177e4 LT |
51 | |
52 | /******************************************************************************* | |
53 | * | |
54 | * FUNCTION: acpi_ns_root_initialize | |
55 | * | |
56 | * PARAMETERS: None | |
57 | * | |
58 | * RETURN: Status | |
59 | * | |
60 | * DESCRIPTION: Allocate and initialize the default root named objects | |
61 | * | |
62 | * MUTEX: Locks namespace for entire execution | |
63 | * | |
64 | ******************************************************************************/ | |
4be44fcd | 65 | acpi_status acpi_ns_root_initialize(void) |
1da177e4 | 66 | { |
4be44fcd | 67 | acpi_status status; |
1da177e4 | 68 | const struct acpi_predefined_names *init_val = NULL; |
4be44fcd LB |
69 | struct acpi_namespace_node *new_node; |
70 | union acpi_operand_object *obj_desc; | |
71 | acpi_string val = NULL; | |
1da177e4 | 72 | |
4be44fcd | 73 | ACPI_FUNCTION_TRACE("ns_root_initialize"); |
1da177e4 | 74 | |
4be44fcd LB |
75 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
76 | if (ACPI_FAILURE(status)) { | |
77 | return_ACPI_STATUS(status); | |
1da177e4 LT |
78 | } |
79 | ||
80 | /* | |
81 | * The global root ptr is initially NULL, so a non-NULL value indicates | |
82 | * that acpi_ns_root_initialize() has already been called; just return. | |
83 | */ | |
84 | if (acpi_gbl_root_node) { | |
85 | status = AE_OK; | |
86 | goto unlock_and_exit; | |
87 | } | |
88 | ||
89 | /* | |
90 | * Tell the rest of the subsystem that the root is initialized | |
91 | * (This is OK because the namespace is locked) | |
92 | */ | |
93 | acpi_gbl_root_node = &acpi_gbl_root_node_struct; | |
94 | ||
95 | /* Enter the pre-defined names in the name table */ | |
96 | ||
4be44fcd LB |
97 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
98 | "Entering predefined entries into namespace\n")); | |
1da177e4 LT |
99 | |
100 | for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) { | |
101 | /* _OSI is optional for now, will be permanent later */ | |
102 | ||
4be44fcd LB |
103 | if (!ACPI_STRCMP(init_val->name, "_OSI") |
104 | && !acpi_gbl_create_osi_method) { | |
1da177e4 LT |
105 | continue; |
106 | } | |
107 | ||
4be44fcd LB |
108 | status = acpi_ns_lookup(NULL, init_val->name, init_val->type, |
109 | ACPI_IMODE_LOAD_PASS2, | |
110 | ACPI_NS_NO_UPSEARCH, NULL, &new_node); | |
1da177e4 | 111 | |
4be44fcd | 112 | if (ACPI_FAILURE(status) || (!new_node)) { /* Must be on same line for code converter */ |
b8e4d893 BM |
113 | ACPI_EXCEPTION((AE_INFO, status, |
114 | "Could not create predefined name %s", | |
115 | init_val->name)); | |
1da177e4 LT |
116 | } |
117 | ||
118 | /* | |
119 | * Name entered successfully. | |
120 | * If entry in pre_defined_names[] specifies an | |
121 | * initial value, create the initial value. | |
122 | */ | |
123 | if (init_val->val) { | |
4be44fcd LB |
124 | status = acpi_os_predefined_override(init_val, &val); |
125 | if (ACPI_FAILURE(status)) { | |
b8e4d893 BM |
126 | ACPI_ERROR((AE_INFO, |
127 | "Could not override predefined %s", | |
128 | init_val->name)); | |
1da177e4 LT |
129 | } |
130 | ||
131 | if (!val) { | |
132 | val = init_val->val; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Entry requests an initial value, allocate a | |
137 | * descriptor for it. | |
138 | */ | |
4be44fcd LB |
139 | obj_desc = |
140 | acpi_ut_create_internal_object(init_val->type); | |
1da177e4 LT |
141 | if (!obj_desc) { |
142 | status = AE_NO_MEMORY; | |
143 | goto unlock_and_exit; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Convert value string from table entry to | |
148 | * internal representation. Only types actually | |
149 | * used for initial values are implemented here. | |
150 | */ | |
151 | switch (init_val->type) { | |
152 | case ACPI_TYPE_METHOD: | |
4be44fcd LB |
153 | obj_desc->method.param_count = |
154 | (u8) ACPI_TO_INTEGER(val); | |
1da177e4 LT |
155 | obj_desc->common.flags |= AOPOBJ_DATA_VALID; |
156 | ||
0c9938cc | 157 | #if defined (ACPI_ASL_COMPILER) |
1da177e4 | 158 | |
0c9938cc RM |
159 | /* save the parameter count for the i_aSL compiler */ |
160 | ||
161 | new_node->value = obj_desc->method.param_count; | |
1da177e4 LT |
162 | #else |
163 | /* Mark this as a very SPECIAL method */ | |
164 | ||
4be44fcd LB |
165 | obj_desc->method.method_flags = |
166 | AML_METHOD_INTERNAL_ONLY; | |
0c9938cc RM |
167 | |
168 | #ifndef ACPI_DUMP_APP | |
4be44fcd LB |
169 | obj_desc->method.implementation = |
170 | acpi_ut_osi_implementation; | |
0c9938cc | 171 | #endif |
1da177e4 LT |
172 | #endif |
173 | break; | |
174 | ||
175 | case ACPI_TYPE_INTEGER: | |
176 | ||
4be44fcd | 177 | obj_desc->integer.value = ACPI_TO_INTEGER(val); |
1da177e4 LT |
178 | break; |
179 | ||
1da177e4 LT |
180 | case ACPI_TYPE_STRING: |
181 | ||
182 | /* | |
183 | * Build an object around the static string | |
184 | */ | |
4be44fcd LB |
185 | obj_desc->string.length = |
186 | (u32) ACPI_STRLEN(val); | |
1da177e4 LT |
187 | obj_desc->string.pointer = val; |
188 | obj_desc->common.flags |= AOPOBJ_STATIC_POINTER; | |
189 | break; | |
190 | ||
1da177e4 LT |
191 | case ACPI_TYPE_MUTEX: |
192 | ||
193 | obj_desc->mutex.node = new_node; | |
4be44fcd LB |
194 | obj_desc->mutex.sync_level = |
195 | (u8) (ACPI_TO_INTEGER(val) - 1); | |
1da177e4 | 196 | |
4be44fcd | 197 | if (ACPI_STRCMP(init_val->name, "_GL_") == 0) { |
1da177e4 LT |
198 | /* |
199 | * Create a counting semaphore for the | |
200 | * global lock | |
201 | */ | |
4be44fcd LB |
202 | status = |
203 | acpi_os_create_semaphore | |
204 | (ACPI_NO_UNIT_LIMIT, 1, | |
205 | &obj_desc->mutex.semaphore); | |
206 | if (ACPI_FAILURE(status)) { | |
207 | acpi_ut_remove_reference | |
208 | (obj_desc); | |
1da177e4 LT |
209 | goto unlock_and_exit; |
210 | } | |
211 | ||
212 | /* | |
213 | * We just created the mutex for the | |
214 | * global lock, save it | |
215 | */ | |
4be44fcd LB |
216 | acpi_gbl_global_lock_semaphore = |
217 | obj_desc->mutex.semaphore; | |
218 | } else { | |
1da177e4 LT |
219 | /* Create a mutex */ |
220 | ||
4be44fcd LB |
221 | status = acpi_os_create_semaphore(1, 1, |
222 | &obj_desc-> | |
223 | mutex. | |
224 | semaphore); | |
225 | if (ACPI_FAILURE(status)) { | |
226 | acpi_ut_remove_reference | |
227 | (obj_desc); | |
1da177e4 LT |
228 | goto unlock_and_exit; |
229 | } | |
230 | } | |
231 | break; | |
232 | ||
1da177e4 LT |
233 | default: |
234 | ||
b8e4d893 BM |
235 | ACPI_ERROR((AE_INFO, |
236 | "Unsupported initial type value %X", | |
237 | init_val->type)); | |
4be44fcd | 238 | acpi_ut_remove_reference(obj_desc); |
1da177e4 LT |
239 | obj_desc = NULL; |
240 | continue; | |
241 | } | |
242 | ||
243 | /* Store pointer to value descriptor in the Node */ | |
244 | ||
4be44fcd LB |
245 | status = acpi_ns_attach_object(new_node, obj_desc, |
246 | ACPI_GET_OBJECT_TYPE | |
247 | (obj_desc)); | |
1da177e4 LT |
248 | |
249 | /* Remove local reference to the object */ | |
250 | ||
4be44fcd | 251 | acpi_ut_remove_reference(obj_desc); |
1da177e4 LT |
252 | } |
253 | } | |
254 | ||
4be44fcd LB |
255 | unlock_and_exit: |
256 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
257 | |
258 | /* Save a handle to "_GPE", it is always present */ | |
259 | ||
4be44fcd LB |
260 | if (ACPI_SUCCESS(status)) { |
261 | status = | |
262 | acpi_ns_get_node_by_path("\\_GPE", NULL, | |
263 | ACPI_NS_NO_UPSEARCH, | |
264 | &acpi_gbl_fadt_gpe_device); | |
1da177e4 LT |
265 | } |
266 | ||
4be44fcd | 267 | return_ACPI_STATUS(status); |
1da177e4 LT |
268 | } |
269 | ||
1da177e4 LT |
270 | /******************************************************************************* |
271 | * | |
272 | * FUNCTION: acpi_ns_lookup | |
273 | * | |
44f6c012 | 274 | * PARAMETERS: scope_info - Current scope info block |
1da177e4 LT |
275 | * Pathname - Search pathname, in internal format |
276 | * (as represented in the AML stream) | |
277 | * Type - Type associated with name | |
278 | * interpreter_mode - IMODE_LOAD_PASS2 => add name if not found | |
279 | * Flags - Flags describing the search restrictions | |
280 | * walk_state - Current state of the walk | |
281 | * return_node - Where the Node is placed (if found | |
282 | * or created successfully) | |
283 | * | |
284 | * RETURN: Status | |
285 | * | |
286 | * DESCRIPTION: Find or enter the passed name in the name space. | |
287 | * Log an error if name not found in Exec mode. | |
288 | * | |
289 | * MUTEX: Assumes namespace is locked. | |
290 | * | |
291 | ******************************************************************************/ | |
292 | ||
293 | acpi_status | |
4be44fcd LB |
294 | acpi_ns_lookup(union acpi_generic_state *scope_info, |
295 | char *pathname, | |
296 | acpi_object_type type, | |
297 | acpi_interpreter_mode interpreter_mode, | |
298 | u32 flags, | |
299 | struct acpi_walk_state *walk_state, | |
300 | struct acpi_namespace_node **return_node) | |
1da177e4 | 301 | { |
4be44fcd LB |
302 | acpi_status status; |
303 | char *path = pathname; | |
304 | struct acpi_namespace_node *prefix_node; | |
305 | struct acpi_namespace_node *current_node = NULL; | |
306 | struct acpi_namespace_node *this_node = NULL; | |
307 | u32 num_segments; | |
308 | u32 num_carats; | |
309 | acpi_name simple_name; | |
310 | acpi_object_type type_to_check_for; | |
311 | acpi_object_type this_search_type; | |
312 | u32 search_parent_flag = ACPI_NS_SEARCH_PARENT; | |
313 | u32 local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND | | |
314 | ACPI_NS_SEARCH_PARENT); | |
315 | ||
316 | ACPI_FUNCTION_TRACE("ns_lookup"); | |
1da177e4 LT |
317 | |
318 | if (!return_node) { | |
4be44fcd | 319 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
320 | } |
321 | ||
322 | acpi_gbl_ns_lookup_count++; | |
323 | *return_node = ACPI_ENTRY_NOT_FOUND; | |
324 | ||
325 | if (!acpi_gbl_root_node) { | |
4be44fcd | 326 | return_ACPI_STATUS(AE_NO_NAMESPACE); |
1da177e4 LT |
327 | } |
328 | ||
329 | /* | |
330 | * Get the prefix scope. | |
331 | * A null scope means use the root scope | |
332 | */ | |
4be44fcd LB |
333 | if ((!scope_info) || (!scope_info->scope.node)) { |
334 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |
335 | "Null scope prefix, using root node (%p)\n", | |
336 | acpi_gbl_root_node)); | |
1da177e4 LT |
337 | |
338 | prefix_node = acpi_gbl_root_node; | |
4be44fcd | 339 | } else { |
1da177e4 | 340 | prefix_node = scope_info->scope.node; |
4be44fcd LB |
341 | if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) != |
342 | ACPI_DESC_TYPE_NAMED) { | |
b8e4d893 BM |
343 | ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]", |
344 | prefix_node, | |
345 | acpi_ut_get_descriptor_name(prefix_node))); | |
4be44fcd | 346 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
347 | } |
348 | ||
349 | /* | |
350 | * This node might not be a actual "scope" node (such as a | |
351 | * Device/Method, etc.) It could be a Package or other object node. | |
352 | * Backup up the tree to find the containing scope node. | |
353 | */ | |
4be44fcd LB |
354 | while (!acpi_ns_opens_scope(prefix_node->type) && |
355 | prefix_node->type != ACPI_TYPE_ANY) { | |
356 | prefix_node = acpi_ns_get_parent_node(prefix_node); | |
1da177e4 LT |
357 | } |
358 | } | |
359 | ||
360 | /* Save type TBD: may be no longer necessary */ | |
361 | ||
362 | type_to_check_for = type; | |
363 | ||
364 | /* | |
365 | * Begin examination of the actual pathname | |
366 | */ | |
367 | if (!pathname) { | |
368 | /* A Null name_path is allowed and refers to the root */ | |
369 | ||
370 | num_segments = 0; | |
4be44fcd LB |
371 | this_node = acpi_gbl_root_node; |
372 | path = ""; | |
1da177e4 | 373 | |
4be44fcd LB |
374 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
375 | "Null Pathname (Zero segments), Flags=%X\n", | |
376 | flags)); | |
377 | } else { | |
1da177e4 LT |
378 | /* |
379 | * Name pointer is valid (and must be in internal name format) | |
380 | * | |
381 | * Check for scope prefixes: | |
382 | * | |
383 | * As represented in the AML stream, a namepath consists of an | |
384 | * optional scope prefix followed by a name segment part. | |
385 | * | |
386 | * If present, the scope prefix is either a Root Prefix (in | |
387 | * which case the name is fully qualified), or one or more | |
388 | * Parent Prefixes (in which case the name's scope is relative | |
389 | * to the current scope). | |
390 | */ | |
391 | if (*path == (u8) AML_ROOT_PREFIX) { | |
392 | /* Pathname is fully qualified, start from the root */ | |
393 | ||
394 | this_node = acpi_gbl_root_node; | |
395 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
396 | ||
397 | /* Point to name segment part */ | |
398 | ||
399 | path++; | |
400 | ||
4be44fcd LB |
401 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
402 | "Path is absolute from root [%p]\n", | |
403 | this_node)); | |
404 | } else { | |
1da177e4 LT |
405 | /* Pathname is relative to current scope, start there */ |
406 | ||
4be44fcd LB |
407 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
408 | "Searching relative to prefix scope [%4.4s] (%p)\n", | |
409 | acpi_ut_get_node_name(prefix_node), | |
410 | prefix_node)); | |
1da177e4 LT |
411 | |
412 | /* | |
413 | * Handle multiple Parent Prefixes (carat) by just getting | |
414 | * the parent node for each prefix instance. | |
415 | */ | |
416 | this_node = prefix_node; | |
417 | num_carats = 0; | |
418 | while (*path == (u8) AML_PARENT_PREFIX) { | |
419 | /* Name is fully qualified, no search rules apply */ | |
420 | ||
421 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
422 | /* | |
423 | * Point past this prefix to the name segment | |
424 | * part or the next Parent Prefix | |
425 | */ | |
426 | path++; | |
427 | ||
428 | /* Backup to the parent node */ | |
429 | ||
430 | num_carats++; | |
4be44fcd | 431 | this_node = acpi_ns_get_parent_node(this_node); |
1da177e4 LT |
432 | if (!this_node) { |
433 | /* Current scope has no parent scope */ | |
434 | ||
b8e4d893 BM |
435 | ACPI_ERROR((AE_INFO, |
436 | "ACPI path has too many parent prefixes (^) - reached beyond root node")); | |
4be44fcd | 437 | return_ACPI_STATUS(AE_NOT_FOUND); |
1da177e4 LT |
438 | } |
439 | } | |
440 | ||
441 | if (search_parent_flag == ACPI_NS_NO_UPSEARCH) { | |
4be44fcd LB |
442 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
443 | "Search scope is [%4.4s], path has %d carat(s)\n", | |
444 | acpi_ut_get_node_name | |
445 | (this_node), num_carats)); | |
1da177e4 LT |
446 | } |
447 | } | |
448 | ||
449 | /* | |
450 | * Determine the number of ACPI name segments in this pathname. | |
451 | * | |
452 | * The segment part consists of either: | |
453 | * - A Null name segment (0) | |
454 | * - A dual_name_prefix followed by two 4-byte name segments | |
455 | * - A multi_name_prefix followed by a byte indicating the | |
456 | * number of segments and the segments themselves. | |
457 | * - A single 4-byte name segment | |
458 | * | |
459 | * Examine the name prefix opcode, if any, to determine the number of | |
460 | * segments. | |
461 | */ | |
462 | switch (*path) { | |
463 | case 0: | |
464 | /* | |
465 | * Null name after a root or parent prefixes. We already | |
466 | * have the correct target node and there are no name segments. | |
467 | */ | |
468 | num_segments = 0; | |
469 | type = this_node->type; | |
470 | ||
4be44fcd LB |
471 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
472 | "Prefix-only Pathname (Zero name segments), Flags=%X\n", | |
473 | flags)); | |
1da177e4 LT |
474 | break; |
475 | ||
476 | case AML_DUAL_NAME_PREFIX: | |
477 | ||
478 | /* More than one name_seg, search rules do not apply */ | |
479 | ||
480 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
481 | ||
482 | /* Two segments, point to first name segment */ | |
483 | ||
484 | num_segments = 2; | |
485 | path++; | |
486 | ||
4be44fcd LB |
487 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
488 | "Dual Pathname (2 segments, Flags=%X)\n", | |
489 | flags)); | |
1da177e4 LT |
490 | break; |
491 | ||
492 | case AML_MULTI_NAME_PREFIX_OP: | |
493 | ||
494 | /* More than one name_seg, search rules do not apply */ | |
495 | ||
496 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
497 | ||
498 | /* Extract segment count, point to first name segment */ | |
499 | ||
500 | path++; | |
4be44fcd | 501 | num_segments = (u32) (u8) * path; |
1da177e4 LT |
502 | path++; |
503 | ||
4be44fcd | 504 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
50eca3eb | 505 | "Multi Pathname (%d Segments, Flags=%X)\n", |
4be44fcd | 506 | num_segments, flags)); |
1da177e4 LT |
507 | break; |
508 | ||
509 | default: | |
510 | /* | |
511 | * Not a Null name, no Dual or Multi prefix, hence there is | |
512 | * only one name segment and Pathname is already pointing to it. | |
513 | */ | |
514 | num_segments = 1; | |
515 | ||
4be44fcd LB |
516 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
517 | "Simple Pathname (1 segment, Flags=%X)\n", | |
518 | flags)); | |
1da177e4 LT |
519 | break; |
520 | } | |
521 | ||
4be44fcd | 522 | ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path)); |
1da177e4 LT |
523 | } |
524 | ||
1da177e4 LT |
525 | /* |
526 | * Search namespace for each segment of the name. Loop through and | |
527 | * verify (or add to the namespace) each name segment. | |
528 | * | |
529 | * The object type is significant only at the last name | |
530 | * segment. (We don't care about the types along the path, only | |
531 | * the type of the final target object.) | |
532 | */ | |
533 | this_search_type = ACPI_TYPE_ANY; | |
534 | current_node = this_node; | |
535 | while (num_segments && current_node) { | |
536 | num_segments--; | |
537 | if (!num_segments) { | |
538 | /* | |
539 | * This is the last segment, enable typechecking | |
540 | */ | |
541 | this_search_type = type; | |
542 | ||
543 | /* | |
544 | * Only allow automatic parent search (search rules) if the caller | |
545 | * requested it AND we have a single, non-fully-qualified name_seg | |
546 | */ | |
547 | if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) && | |
4be44fcd | 548 | (flags & ACPI_NS_SEARCH_PARENT)) { |
1da177e4 LT |
549 | local_flags |= ACPI_NS_SEARCH_PARENT; |
550 | } | |
551 | ||
552 | /* Set error flag according to caller */ | |
553 | ||
554 | if (flags & ACPI_NS_ERROR_IF_FOUND) { | |
555 | local_flags |= ACPI_NS_ERROR_IF_FOUND; | |
556 | } | |
557 | } | |
558 | ||
559 | /* Extract one ACPI name from the front of the pathname */ | |
560 | ||
4be44fcd | 561 | ACPI_MOVE_32_TO_32(&simple_name, path); |
1da177e4 LT |
562 | |
563 | /* Try to find the single (4 character) ACPI name */ | |
564 | ||
4be44fcd LB |
565 | status = |
566 | acpi_ns_search_and_enter(simple_name, walk_state, | |
567 | current_node, interpreter_mode, | |
568 | this_search_type, local_flags, | |
569 | &this_node); | |
570 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
571 | if (status == AE_NOT_FOUND) { |
572 | /* Name not found in ACPI namespace */ | |
573 | ||
4be44fcd LB |
574 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
575 | "Name [%4.4s] not found in scope [%4.4s] %p\n", | |
576 | (char *)&simple_name, | |
577 | (char *)¤t_node->name, | |
578 | current_node)); | |
1da177e4 LT |
579 | } |
580 | ||
581 | *return_node = this_node; | |
4be44fcd | 582 | return_ACPI_STATUS(status); |
1da177e4 LT |
583 | } |
584 | ||
585 | /* | |
586 | * Sanity typecheck of the target object: | |
587 | * | |
588 | * If 1) This is the last segment (num_segments == 0) | |
589 | * 2) And we are looking for a specific type | |
590 | * (Not checking for TYPE_ANY) | |
591 | * 3) Which is not an alias | |
592 | * 4) Which is not a local type (TYPE_SCOPE) | |
593 | * 5) And the type of target object is known (not TYPE_ANY) | |
594 | * 6) And target object does not match what we are looking for | |
595 | * | |
596 | * Then we have a type mismatch. Just warn and ignore it. | |
597 | */ | |
4be44fcd LB |
598 | if ((num_segments == 0) && |
599 | (type_to_check_for != ACPI_TYPE_ANY) && | |
600 | (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) && | |
601 | (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS) && | |
602 | (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE) && | |
603 | (this_node->type != ACPI_TYPE_ANY) && | |
604 | (this_node->type != type_to_check_for)) { | |
1da177e4 LT |
605 | /* Complain about a type mismatch */ |
606 | ||
b8e4d893 BM |
607 | ACPI_WARNING((AE_INFO, |
608 | "ns_lookup: Type mismatch on %4.4s (%s), searching for (%s)", | |
609 | ACPI_CAST_PTR(char, &simple_name), | |
610 | acpi_ut_get_type_name(this_node->type), | |
611 | acpi_ut_get_type_name | |
612 | (type_to_check_for))); | |
1da177e4 LT |
613 | } |
614 | ||
615 | /* | |
616 | * If this is the last name segment and we are not looking for a | |
617 | * specific type, but the type of found object is known, use that type | |
618 | * to see if it opens a scope. | |
619 | */ | |
620 | if ((num_segments == 0) && (type == ACPI_TYPE_ANY)) { | |
621 | type = this_node->type; | |
622 | } | |
623 | ||
624 | /* Point to next name segment and make this node current */ | |
625 | ||
626 | path += ACPI_NAME_SIZE; | |
627 | current_node = this_node; | |
628 | } | |
629 | ||
630 | /* | |
631 | * Always check if we need to open a new scope | |
632 | */ | |
633 | if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) { | |
634 | /* | |
635 | * If entry is a type which opens a scope, push the new scope on the | |
636 | * scope stack. | |
637 | */ | |
4be44fcd LB |
638 | if (acpi_ns_opens_scope(type)) { |
639 | status = | |
640 | acpi_ds_scope_stack_push(this_node, type, | |
641 | walk_state); | |
642 | if (ACPI_FAILURE(status)) { | |
643 | return_ACPI_STATUS(status); | |
1da177e4 LT |
644 | } |
645 | } | |
646 | } | |
647 | ||
648 | *return_node = this_node; | |
4be44fcd | 649 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 650 | } |