Commit | Line | Data |
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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: nsaccess - Top-level functions for accessing ACPI namespace | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
77848130 | 8 | * Copyright (C) 2000 - 2012, Intel Corp. |
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 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "amlcode.h" | |
47 | #include "acnamesp.h" | |
48 | #include "acdispat.h" | |
1da177e4 | 49 | |
1da177e4 | 50 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 51 | ACPI_MODULE_NAME("nsaccess") |
1da177e4 LT |
52 | |
53 | /******************************************************************************* | |
54 | * | |
55 | * FUNCTION: acpi_ns_root_initialize | |
56 | * | |
57 | * PARAMETERS: None | |
58 | * | |
59 | * RETURN: Status | |
60 | * | |
61 | * DESCRIPTION: Allocate and initialize the default root named objects | |
62 | * | |
63 | * MUTEX: Locks namespace for entire execution | |
64 | * | |
65 | ******************************************************************************/ | |
4be44fcd | 66 | acpi_status acpi_ns_root_initialize(void) |
1da177e4 | 67 | { |
4be44fcd | 68 | acpi_status status; |
1da177e4 | 69 | const struct acpi_predefined_names *init_val = NULL; |
4be44fcd LB |
70 | struct acpi_namespace_node *new_node; |
71 | union acpi_operand_object *obj_desc; | |
72 | acpi_string val = NULL; | |
1da177e4 | 73 | |
b229cf92 | 74 | ACPI_FUNCTION_TRACE(ns_root_initialize); |
1da177e4 | 75 | |
4be44fcd LB |
76 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
77 | if (ACPI_FAILURE(status)) { | |
78 | return_ACPI_STATUS(status); | |
1da177e4 LT |
79 | } |
80 | ||
81 | /* | |
82 | * The global root ptr is initially NULL, so a non-NULL value indicates | |
83 | * that acpi_ns_root_initialize() has already been called; just return. | |
84 | */ | |
85 | if (acpi_gbl_root_node) { | |
86 | status = AE_OK; | |
87 | goto unlock_and_exit; | |
88 | } | |
89 | ||
90 | /* | |
91 | * Tell the rest of the subsystem that the root is initialized | |
92 | * (This is OK because the namespace is locked) | |
93 | */ | |
94 | acpi_gbl_root_node = &acpi_gbl_root_node_struct; | |
95 | ||
96 | /* Enter the pre-defined names in the name table */ | |
97 | ||
4be44fcd LB |
98 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
99 | "Entering predefined entries into namespace\n")); | |
1da177e4 LT |
100 | |
101 | for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) { | |
52fc0b02 | 102 | |
1da177e4 LT |
103 | /* _OSI is optional for now, will be permanent later */ |
104 | ||
4be44fcd LB |
105 | if (!ACPI_STRCMP(init_val->name, "_OSI") |
106 | && !acpi_gbl_create_osi_method) { | |
1da177e4 LT |
107 | continue; |
108 | } | |
109 | ||
4be44fcd LB |
110 | status = acpi_ns_lookup(NULL, init_val->name, init_val->type, |
111 | ACPI_IMODE_LOAD_PASS2, | |
112 | ACPI_NS_NO_UPSEARCH, NULL, &new_node); | |
267d672a | 113 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
114 | ACPI_EXCEPTION((AE_INFO, status, |
115 | "Could not create predefined name %s", | |
116 | init_val->name)); | |
267d672a | 117 | continue; |
1da177e4 LT |
118 | } |
119 | ||
120 | /* | |
d4913dc6 BM |
121 | * Name entered successfully. If entry in pre_defined_names[] specifies |
122 | * an initial value, create the initial value. | |
1da177e4 LT |
123 | */ |
124 | if (init_val->val) { | |
4be44fcd LB |
125 | status = acpi_os_predefined_override(init_val, &val); |
126 | if (ACPI_FAILURE(status)) { | |
b8e4d893 BM |
127 | ACPI_ERROR((AE_INFO, |
128 | "Could not override predefined %s", | |
129 | init_val->name)); | |
1da177e4 LT |
130 | } |
131 | ||
132 | if (!val) { | |
133 | val = init_val->val; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Entry requests an initial value, allocate a | |
138 | * descriptor for it. | |
139 | */ | |
4be44fcd LB |
140 | obj_desc = |
141 | acpi_ut_create_internal_object(init_val->type); | |
1da177e4 LT |
142 | if (!obj_desc) { |
143 | status = AE_NO_MEMORY; | |
144 | goto unlock_and_exit; | |
145 | } | |
146 | ||
147 | /* | |
148 | * Convert value string from table entry to | |
149 | * internal representation. Only types actually | |
150 | * used for initial values are implemented here. | |
151 | */ | |
152 | switch (init_val->type) { | |
153 | case ACPI_TYPE_METHOD: | |
4be44fcd LB |
154 | obj_desc->method.param_count = |
155 | (u8) ACPI_TO_INTEGER(val); | |
1da177e4 LT |
156 | obj_desc->common.flags |= AOPOBJ_DATA_VALID; |
157 | ||
0c9938cc | 158 | #if defined (ACPI_ASL_COMPILER) |
1da177e4 | 159 | |
ba494bee | 160 | /* Save the parameter count for the iASL compiler */ |
0c9938cc RM |
161 | |
162 | new_node->value = obj_desc->method.param_count; | |
1da177e4 LT |
163 | #else |
164 | /* Mark this as a very SPECIAL method */ | |
165 | ||
26294842 LM |
166 | obj_desc->method.info_flags = |
167 | ACPI_METHOD_INTERNAL_ONLY; | |
168 | obj_desc->method.dispatch.implementation = | |
4be44fcd | 169 | acpi_ut_osi_implementation; |
1da177e4 LT |
170 | #endif |
171 | break; | |
172 | ||
173 | case ACPI_TYPE_INTEGER: | |
174 | ||
4be44fcd | 175 | obj_desc->integer.value = ACPI_TO_INTEGER(val); |
1da177e4 LT |
176 | break; |
177 | ||
1da177e4 LT |
178 | case ACPI_TYPE_STRING: |
179 | ||
d4913dc6 BM |
180 | /* Build an object around the static string */ |
181 | ||
1f86e8c1 | 182 | obj_desc->string.length = (u32)ACPI_STRLEN(val); |
1da177e4 LT |
183 | obj_desc->string.pointer = val; |
184 | obj_desc->common.flags |= AOPOBJ_STATIC_POINTER; | |
185 | break; | |
186 | ||
1da177e4 LT |
187 | case ACPI_TYPE_MUTEX: |
188 | ||
189 | obj_desc->mutex.node = new_node; | |
4be44fcd LB |
190 | obj_desc->mutex.sync_level = |
191 | (u8) (ACPI_TO_INTEGER(val) - 1); | |
1da177e4 | 192 | |
c81da666 BM |
193 | /* Create a mutex */ |
194 | ||
195 | status = | |
196 | acpi_os_create_mutex(&obj_desc->mutex. | |
197 | os_mutex); | |
198 | if (ACPI_FAILURE(status)) { | |
199 | acpi_ut_remove_reference(obj_desc); | |
200 | goto unlock_and_exit; | |
201 | } | |
967440e3 | 202 | |
c81da666 | 203 | /* Special case for ACPI Global Lock */ |
1da177e4 | 204 | |
c81da666 | 205 | if (ACPI_STRCMP(init_val->name, "_GL_") == 0) { |
ba886cd4 | 206 | acpi_gbl_global_lock_mutex = obj_desc; |
967440e3 | 207 | |
c81da666 | 208 | /* Create additional counting semaphore for global lock */ |
1da177e4 | 209 | |
967440e3 | 210 | status = |
73ca0fbc | 211 | acpi_os_create_semaphore(1, 0, |
c81da666 | 212 | &acpi_gbl_global_lock_semaphore); |
4be44fcd LB |
213 | if (ACPI_FAILURE(status)) { |
214 | acpi_ut_remove_reference | |
215 | (obj_desc); | |
1da177e4 LT |
216 | goto unlock_and_exit; |
217 | } | |
218 | } | |
219 | break; | |
220 | ||
1da177e4 LT |
221 | default: |
222 | ||
b8e4d893 | 223 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 224 | "Unsupported initial type value 0x%X", |
b8e4d893 | 225 | init_val->type)); |
4be44fcd | 226 | acpi_ut_remove_reference(obj_desc); |
1da177e4 LT |
227 | obj_desc = NULL; |
228 | continue; | |
229 | } | |
230 | ||
231 | /* Store pointer to value descriptor in the Node */ | |
232 | ||
4be44fcd | 233 | status = acpi_ns_attach_object(new_node, obj_desc, |
3371c19c | 234 | obj_desc->common.type); |
1da177e4 LT |
235 | |
236 | /* Remove local reference to the object */ | |
237 | ||
4be44fcd | 238 | acpi_ut_remove_reference(obj_desc); |
1da177e4 LT |
239 | } |
240 | } | |
241 | ||
4be44fcd LB |
242 | unlock_and_exit: |
243 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
244 | |
245 | /* Save a handle to "_GPE", it is always present */ | |
246 | ||
4be44fcd | 247 | if (ACPI_SUCCESS(status)) { |
4119532c BM |
248 | status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, |
249 | &acpi_gbl_fadt_gpe_device); | |
1da177e4 LT |
250 | } |
251 | ||
4be44fcd | 252 | return_ACPI_STATUS(status); |
1da177e4 LT |
253 | } |
254 | ||
1da177e4 LT |
255 | /******************************************************************************* |
256 | * | |
257 | * FUNCTION: acpi_ns_lookup | |
258 | * | |
44f6c012 | 259 | * PARAMETERS: scope_info - Current scope info block |
ba494bee | 260 | * pathname - Search pathname, in internal format |
1da177e4 | 261 | * (as represented in the AML stream) |
ba494bee | 262 | * type - Type associated with name |
1da177e4 | 263 | * interpreter_mode - IMODE_LOAD_PASS2 => add name if not found |
ba494bee | 264 | * flags - Flags describing the search restrictions |
1da177e4 LT |
265 | * walk_state - Current state of the walk |
266 | * return_node - Where the Node is placed (if found | |
267 | * or created successfully) | |
268 | * | |
269 | * RETURN: Status | |
270 | * | |
271 | * DESCRIPTION: Find or enter the passed name in the name space. | |
272 | * Log an error if name not found in Exec mode. | |
273 | * | |
274 | * MUTEX: Assumes namespace is locked. | |
275 | * | |
276 | ******************************************************************************/ | |
277 | ||
278 | acpi_status | |
4be44fcd LB |
279 | acpi_ns_lookup(union acpi_generic_state *scope_info, |
280 | char *pathname, | |
281 | acpi_object_type type, | |
282 | acpi_interpreter_mode interpreter_mode, | |
283 | u32 flags, | |
284 | struct acpi_walk_state *walk_state, | |
285 | struct acpi_namespace_node **return_node) | |
1da177e4 | 286 | { |
4be44fcd LB |
287 | acpi_status status; |
288 | char *path = pathname; | |
289 | struct acpi_namespace_node *prefix_node; | |
290 | struct acpi_namespace_node *current_node = NULL; | |
291 | struct acpi_namespace_node *this_node = NULL; | |
292 | u32 num_segments; | |
293 | u32 num_carats; | |
294 | acpi_name simple_name; | |
295 | acpi_object_type type_to_check_for; | |
296 | acpi_object_type this_search_type; | |
297 | u32 search_parent_flag = ACPI_NS_SEARCH_PARENT; | |
958dd242 | 298 | u32 local_flags; |
4be44fcd | 299 | |
b229cf92 | 300 | ACPI_FUNCTION_TRACE(ns_lookup); |
1da177e4 LT |
301 | |
302 | if (!return_node) { | |
4be44fcd | 303 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
304 | } |
305 | ||
958dd242 | 306 | local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_SEARCH_PARENT); |
1da177e4 | 307 | *return_node = ACPI_ENTRY_NOT_FOUND; |
958dd242 | 308 | acpi_gbl_ns_lookup_count++; |
1da177e4 LT |
309 | |
310 | if (!acpi_gbl_root_node) { | |
4be44fcd | 311 | return_ACPI_STATUS(AE_NO_NAMESPACE); |
1da177e4 LT |
312 | } |
313 | ||
d4913dc6 BM |
314 | /* Get the prefix scope. A null scope means use the root scope */ |
315 | ||
4be44fcd LB |
316 | if ((!scope_info) || (!scope_info->scope.node)) { |
317 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |
318 | "Null scope prefix, using root node (%p)\n", | |
319 | acpi_gbl_root_node)); | |
1da177e4 LT |
320 | |
321 | prefix_node = acpi_gbl_root_node; | |
4be44fcd | 322 | } else { |
1da177e4 | 323 | prefix_node = scope_info->scope.node; |
4be44fcd LB |
324 | if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) != |
325 | ACPI_DESC_TYPE_NAMED) { | |
b8e4d893 BM |
326 | ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]", |
327 | prefix_node, | |
328 | acpi_ut_get_descriptor_name(prefix_node))); | |
4be44fcd | 329 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
330 | } |
331 | ||
8313524a BM |
332 | if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) { |
333 | /* | |
334 | * This node might not be a actual "scope" node (such as a | |
d4913dc6 BM |
335 | * Device/Method, etc.) It could be a Package or other object |
336 | * node. Backup up the tree to find the containing scope node. | |
8313524a BM |
337 | */ |
338 | while (!acpi_ns_opens_scope(prefix_node->type) && | |
339 | prefix_node->type != ACPI_TYPE_ANY) { | |
c45b5c09 | 340 | prefix_node = prefix_node->parent; |
8313524a | 341 | } |
1da177e4 LT |
342 | } |
343 | } | |
344 | ||
d4913dc6 | 345 | /* Save type. TBD: may be no longer necessary */ |
1da177e4 LT |
346 | |
347 | type_to_check_for = type; | |
348 | ||
349 | /* | |
350 | * Begin examination of the actual pathname | |
351 | */ | |
352 | if (!pathname) { | |
52fc0b02 | 353 | |
1da177e4 LT |
354 | /* A Null name_path is allowed and refers to the root */ |
355 | ||
356 | num_segments = 0; | |
4be44fcd LB |
357 | this_node = acpi_gbl_root_node; |
358 | path = ""; | |
1da177e4 | 359 | |
4be44fcd LB |
360 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
361 | "Null Pathname (Zero segments), Flags=%X\n", | |
362 | flags)); | |
363 | } else { | |
1da177e4 LT |
364 | /* |
365 | * Name pointer is valid (and must be in internal name format) | |
366 | * | |
367 | * Check for scope prefixes: | |
368 | * | |
369 | * As represented in the AML stream, a namepath consists of an | |
370 | * optional scope prefix followed by a name segment part. | |
371 | * | |
372 | * If present, the scope prefix is either a Root Prefix (in | |
373 | * which case the name is fully qualified), or one or more | |
374 | * Parent Prefixes (in which case the name's scope is relative | |
375 | * to the current scope). | |
376 | */ | |
377 | if (*path == (u8) AML_ROOT_PREFIX) { | |
52fc0b02 | 378 | |
1da177e4 LT |
379 | /* Pathname is fully qualified, start from the root */ |
380 | ||
381 | this_node = acpi_gbl_root_node; | |
382 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
383 | ||
384 | /* Point to name segment part */ | |
385 | ||
386 | path++; | |
387 | ||
4be44fcd LB |
388 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
389 | "Path is absolute from root [%p]\n", | |
390 | this_node)); | |
391 | } else { | |
1da177e4 LT |
392 | /* Pathname is relative to current scope, start there */ |
393 | ||
4be44fcd LB |
394 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
395 | "Searching relative to prefix scope [%4.4s] (%p)\n", | |
396 | acpi_ut_get_node_name(prefix_node), | |
397 | prefix_node)); | |
1da177e4 LT |
398 | |
399 | /* | |
400 | * Handle multiple Parent Prefixes (carat) by just getting | |
401 | * the parent node for each prefix instance. | |
402 | */ | |
403 | this_node = prefix_node; | |
404 | num_carats = 0; | |
405 | while (*path == (u8) AML_PARENT_PREFIX) { | |
52fc0b02 | 406 | |
1da177e4 LT |
407 | /* Name is fully qualified, no search rules apply */ |
408 | ||
409 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
d4913dc6 | 410 | |
1da177e4 LT |
411 | /* |
412 | * Point past this prefix to the name segment | |
413 | * part or the next Parent Prefix | |
414 | */ | |
415 | path++; | |
416 | ||
417 | /* Backup to the parent node */ | |
418 | ||
419 | num_carats++; | |
c45b5c09 | 420 | this_node = this_node->parent; |
1da177e4 | 421 | if (!this_node) { |
52fc0b02 | 422 | |
1da177e4 LT |
423 | /* Current scope has no parent scope */ |
424 | ||
b8e4d893 | 425 | ACPI_ERROR((AE_INFO, |
d4913dc6 BM |
426 | "ACPI path has too many parent prefixes (^) " |
427 | "- reached beyond root node")); | |
4be44fcd | 428 | return_ACPI_STATUS(AE_NOT_FOUND); |
1da177e4 LT |
429 | } |
430 | } | |
431 | ||
432 | if (search_parent_flag == ACPI_NS_NO_UPSEARCH) { | |
4be44fcd | 433 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
b27d6597 | 434 | "Search scope is [%4.4s], path has %u carat(s)\n", |
4be44fcd LB |
435 | acpi_ut_get_node_name |
436 | (this_node), num_carats)); | |
1da177e4 LT |
437 | } |
438 | } | |
439 | ||
440 | /* | |
441 | * Determine the number of ACPI name segments in this pathname. | |
442 | * | |
443 | * The segment part consists of either: | |
444 | * - A Null name segment (0) | |
445 | * - A dual_name_prefix followed by two 4-byte name segments | |
446 | * - A multi_name_prefix followed by a byte indicating the | |
447 | * number of segments and the segments themselves. | |
448 | * - A single 4-byte name segment | |
449 | * | |
450 | * Examine the name prefix opcode, if any, to determine the number of | |
451 | * segments. | |
452 | */ | |
453 | switch (*path) { | |
454 | case 0: | |
455 | /* | |
456 | * Null name after a root or parent prefixes. We already | |
457 | * have the correct target node and there are no name segments. | |
458 | */ | |
459 | num_segments = 0; | |
460 | type = this_node->type; | |
461 | ||
4be44fcd LB |
462 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
463 | "Prefix-only Pathname (Zero name segments), Flags=%X\n", | |
464 | flags)); | |
1da177e4 LT |
465 | break; |
466 | ||
467 | case AML_DUAL_NAME_PREFIX: | |
468 | ||
469 | /* More than one name_seg, search rules do not apply */ | |
470 | ||
471 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
472 | ||
473 | /* Two segments, point to first name segment */ | |
474 | ||
475 | num_segments = 2; | |
476 | path++; | |
477 | ||
4be44fcd LB |
478 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
479 | "Dual Pathname (2 segments, Flags=%X)\n", | |
480 | flags)); | |
1da177e4 LT |
481 | break; |
482 | ||
483 | case AML_MULTI_NAME_PREFIX_OP: | |
484 | ||
485 | /* More than one name_seg, search rules do not apply */ | |
486 | ||
487 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
488 | ||
489 | /* Extract segment count, point to first name segment */ | |
490 | ||
491 | path++; | |
4be44fcd | 492 | num_segments = (u32) (u8) * path; |
1da177e4 LT |
493 | path++; |
494 | ||
4be44fcd | 495 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
b27d6597 | 496 | "Multi Pathname (%u Segments, Flags=%X)\n", |
4be44fcd | 497 | num_segments, flags)); |
1da177e4 LT |
498 | break; |
499 | ||
500 | default: | |
501 | /* | |
502 | * Not a Null name, no Dual or Multi prefix, hence there is | |
503 | * only one name segment and Pathname is already pointing to it. | |
504 | */ | |
505 | num_segments = 1; | |
506 | ||
4be44fcd LB |
507 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
508 | "Simple Pathname (1 segment, Flags=%X)\n", | |
509 | flags)); | |
1da177e4 LT |
510 | break; |
511 | } | |
512 | ||
4be44fcd | 513 | ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path)); |
1da177e4 LT |
514 | } |
515 | ||
1da177e4 | 516 | /* |
319f8b89 | 517 | * Search namespace for each segment of the name. Loop through and |
1da177e4 LT |
518 | * verify (or add to the namespace) each name segment. |
519 | * | |
520 | * The object type is significant only at the last name | |
319f8b89 | 521 | * segment. (We don't care about the types along the path, only |
1da177e4 LT |
522 | * the type of the final target object.) |
523 | */ | |
524 | this_search_type = ACPI_TYPE_ANY; | |
525 | current_node = this_node; | |
526 | while (num_segments && current_node) { | |
527 | num_segments--; | |
528 | if (!num_segments) { | |
d4913dc6 BM |
529 | |
530 | /* This is the last segment, enable typechecking */ | |
531 | ||
1da177e4 LT |
532 | this_search_type = type; |
533 | ||
534 | /* | |
535 | * Only allow automatic parent search (search rules) if the caller | |
536 | * requested it AND we have a single, non-fully-qualified name_seg | |
537 | */ | |
538 | if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) && | |
4be44fcd | 539 | (flags & ACPI_NS_SEARCH_PARENT)) { |
1da177e4 LT |
540 | local_flags |= ACPI_NS_SEARCH_PARENT; |
541 | } | |
542 | ||
543 | /* Set error flag according to caller */ | |
544 | ||
545 | if (flags & ACPI_NS_ERROR_IF_FOUND) { | |
546 | local_flags |= ACPI_NS_ERROR_IF_FOUND; | |
547 | } | |
548 | } | |
549 | ||
550 | /* Extract one ACPI name from the front of the pathname */ | |
551 | ||
4be44fcd | 552 | ACPI_MOVE_32_TO_32(&simple_name, path); |
1da177e4 LT |
553 | |
554 | /* Try to find the single (4 character) ACPI name */ | |
555 | ||
4be44fcd LB |
556 | status = |
557 | acpi_ns_search_and_enter(simple_name, walk_state, | |
558 | current_node, interpreter_mode, | |
559 | this_search_type, local_flags, | |
560 | &this_node); | |
561 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 562 | if (status == AE_NOT_FOUND) { |
52fc0b02 | 563 | |
1da177e4 LT |
564 | /* Name not found in ACPI namespace */ |
565 | ||
4be44fcd LB |
566 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
567 | "Name [%4.4s] not found in scope [%4.4s] %p\n", | |
568 | (char *)&simple_name, | |
569 | (char *)¤t_node->name, | |
570 | current_node)); | |
1da177e4 LT |
571 | } |
572 | ||
573 | *return_node = this_node; | |
4be44fcd | 574 | return_ACPI_STATUS(status); |
1da177e4 LT |
575 | } |
576 | ||
53cf1744 BM |
577 | /* More segments to follow? */ |
578 | ||
579 | if (num_segments > 0) { | |
580 | /* | |
581 | * If we have an alias to an object that opens a scope (such as a | |
d4913dc6 BM |
582 | * device or processor), we need to dereference the alias here so |
583 | * that we can access any children of the original node (via the | |
584 | * remaining segments). | |
53cf1744 BM |
585 | */ |
586 | if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) { | |
5572a985 BM |
587 | if (!this_node->object) { |
588 | return_ACPI_STATUS(AE_NOT_EXIST); | |
589 | } | |
590 | ||
53cf1744 | 591 | if (acpi_ns_opens_scope |
d4913dc6 BM |
592 | (((struct acpi_namespace_node *) |
593 | this_node->object)->type)) { | |
53cf1744 BM |
594 | this_node = |
595 | (struct acpi_namespace_node *) | |
596 | this_node->object; | |
597 | } | |
598 | } | |
1da177e4 LT |
599 | } |
600 | ||
53cf1744 BM |
601 | /* Special handling for the last segment (num_segments == 0) */ |
602 | ||
603 | else { | |
604 | /* | |
605 | * Sanity typecheck of the target object: | |
606 | * | |
607 | * If 1) This is the last segment (num_segments == 0) | |
608 | * 2) And we are looking for a specific type | |
609 | * (Not checking for TYPE_ANY) | |
610 | * 3) Which is not an alias | |
611 | * 4) Which is not a local type (TYPE_SCOPE) | |
612 | * 5) And the type of target object is known (not TYPE_ANY) | |
613 | * 6) And target object does not match what we are looking for | |
614 | * | |
615 | * Then we have a type mismatch. Just warn and ignore it. | |
616 | */ | |
617 | if ((type_to_check_for != ACPI_TYPE_ANY) && | |
618 | (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) && | |
619 | (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS) | |
620 | && (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE) | |
621 | && (this_node->type != ACPI_TYPE_ANY) | |
622 | && (this_node->type != type_to_check_for)) { | |
623 | ||
624 | /* Complain about a type mismatch */ | |
625 | ||
626 | ACPI_WARNING((AE_INFO, | |
627 | "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", | |
628 | ACPI_CAST_PTR(char, &simple_name), | |
629 | acpi_ut_get_type_name(this_node-> | |
630 | type), | |
631 | acpi_ut_get_type_name | |
632 | (type_to_check_for))); | |
633 | } | |
634 | ||
635 | /* | |
636 | * If this is the last name segment and we are not looking for a | |
d4913dc6 BM |
637 | * specific type, but the type of found object is known, use that |
638 | * type to (later) see if it opens a scope. | |
53cf1744 BM |
639 | */ |
640 | if (type == ACPI_TYPE_ANY) { | |
641 | type = this_node->type; | |
642 | } | |
1da177e4 LT |
643 | } |
644 | ||
645 | /* Point to next name segment and make this node current */ | |
646 | ||
647 | path += ACPI_NAME_SIZE; | |
648 | current_node = this_node; | |
649 | } | |
650 | ||
d4913dc6 BM |
651 | /* Always check if we need to open a new scope */ |
652 | ||
1da177e4 LT |
653 | if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) { |
654 | /* | |
655 | * If entry is a type which opens a scope, push the new scope on the | |
656 | * scope stack. | |
657 | */ | |
4be44fcd LB |
658 | if (acpi_ns_opens_scope(type)) { |
659 | status = | |
660 | acpi_ds_scope_stack_push(this_node, type, | |
661 | walk_state); | |
662 | if (ACPI_FAILURE(status)) { | |
663 | return_ACPI_STATUS(status); | |
1da177e4 LT |
664 | } |
665 | } | |
666 | } | |
667 | ||
668 | *return_node = this_node; | |
4be44fcd | 669 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 670 | } |