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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: nsaccess - Top-level functions for accessing ACPI namespace | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, 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 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 | |
b229cf92 | 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++) { | |
52fc0b02 | 101 | |
1da177e4 LT |
102 | /* _OSI is optional for now, will be permanent later */ |
103 | ||
4be44fcd LB |
104 | if (!ACPI_STRCMP(init_val->name, "_OSI") |
105 | && !acpi_gbl_create_osi_method) { | |
1da177e4 LT |
106 | continue; |
107 | } | |
108 | ||
4be44fcd LB |
109 | status = acpi_ns_lookup(NULL, init_val->name, init_val->type, |
110 | ACPI_IMODE_LOAD_PASS2, | |
111 | ACPI_NS_NO_UPSEARCH, NULL, &new_node); | |
1da177e4 | 112 | |
4be44fcd | 113 | if (ACPI_FAILURE(status) || (!new_node)) { /* Must be on same line for code converter */ |
b8e4d893 BM |
114 | ACPI_EXCEPTION((AE_INFO, status, |
115 | "Could not create predefined name %s", | |
116 | init_val->name)); | |
1da177e4 LT |
117 | } |
118 | ||
119 | /* | |
120 | * Name entered successfully. | |
121 | * If entry in pre_defined_names[] specifies an | |
122 | * initial value, create the initial value. | |
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 | |
958dd242 | 160 | /* Save the parameter count for the i_aSL 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 | ||
4be44fcd LB |
166 | obj_desc->method.method_flags = |
167 | AML_METHOD_INTERNAL_ONLY; | |
0c9938cc RM |
168 | |
169 | #ifndef ACPI_DUMP_APP | |
4be44fcd LB |
170 | obj_desc->method.implementation = |
171 | acpi_ut_osi_implementation; | |
0c9938cc | 172 | #endif |
1da177e4 LT |
173 | #endif |
174 | break; | |
175 | ||
176 | case ACPI_TYPE_INTEGER: | |
177 | ||
4be44fcd | 178 | obj_desc->integer.value = ACPI_TO_INTEGER(val); |
1da177e4 LT |
179 | break; |
180 | ||
1da177e4 LT |
181 | case ACPI_TYPE_STRING: |
182 | ||
183 | /* | |
184 | * Build an object around the static string | |
185 | */ | |
4be44fcd LB |
186 | obj_desc->string.length = |
187 | (u32) ACPI_STRLEN(val); | |
1da177e4 LT |
188 | obj_desc->string.pointer = val; |
189 | obj_desc->common.flags |= AOPOBJ_STATIC_POINTER; | |
190 | break; | |
191 | ||
1da177e4 LT |
192 | case ACPI_TYPE_MUTEX: |
193 | ||
194 | obj_desc->mutex.node = new_node; | |
4be44fcd LB |
195 | obj_desc->mutex.sync_level = |
196 | (u8) (ACPI_TO_INTEGER(val) - 1); | |
1da177e4 | 197 | |
c81da666 BM |
198 | /* Create a mutex */ |
199 | ||
200 | status = | |
201 | acpi_os_create_mutex(&obj_desc->mutex. | |
202 | os_mutex); | |
203 | if (ACPI_FAILURE(status)) { | |
204 | acpi_ut_remove_reference(obj_desc); | |
205 | goto unlock_and_exit; | |
206 | } | |
967440e3 | 207 | |
c81da666 | 208 | /* Special case for ACPI Global Lock */ |
1da177e4 | 209 | |
c81da666 | 210 | if (ACPI_STRCMP(init_val->name, "_GL_") == 0) { |
ba886cd4 | 211 | acpi_gbl_global_lock_mutex = obj_desc; |
967440e3 | 212 | |
c81da666 | 213 | /* Create additional counting semaphore for global lock */ |
1da177e4 | 214 | |
967440e3 | 215 | status = |
73ca0fbc | 216 | acpi_os_create_semaphore(1, 0, |
c81da666 | 217 | &acpi_gbl_global_lock_semaphore); |
4be44fcd LB |
218 | if (ACPI_FAILURE(status)) { |
219 | acpi_ut_remove_reference | |
220 | (obj_desc); | |
1da177e4 LT |
221 | goto unlock_and_exit; |
222 | } | |
223 | } | |
224 | break; | |
225 | ||
1da177e4 LT |
226 | default: |
227 | ||
b8e4d893 BM |
228 | ACPI_ERROR((AE_INFO, |
229 | "Unsupported initial type value %X", | |
230 | init_val->type)); | |
4be44fcd | 231 | acpi_ut_remove_reference(obj_desc); |
1da177e4 LT |
232 | obj_desc = NULL; |
233 | continue; | |
234 | } | |
235 | ||
236 | /* Store pointer to value descriptor in the Node */ | |
237 | ||
4be44fcd LB |
238 | status = acpi_ns_attach_object(new_node, obj_desc, |
239 | ACPI_GET_OBJECT_TYPE | |
240 | (obj_desc)); | |
1da177e4 LT |
241 | |
242 | /* Remove local reference to the object */ | |
243 | ||
4be44fcd | 244 | acpi_ut_remove_reference(obj_desc); |
1da177e4 LT |
245 | } |
246 | } | |
247 | ||
4be44fcd LB |
248 | unlock_and_exit: |
249 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
250 | |
251 | /* Save a handle to "_GPE", it is always present */ | |
252 | ||
4be44fcd | 253 | if (ACPI_SUCCESS(status)) { |
4119532c BM |
254 | status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, |
255 | &acpi_gbl_fadt_gpe_device); | |
1da177e4 LT |
256 | } |
257 | ||
4be44fcd | 258 | return_ACPI_STATUS(status); |
1da177e4 LT |
259 | } |
260 | ||
1da177e4 LT |
261 | /******************************************************************************* |
262 | * | |
263 | * FUNCTION: acpi_ns_lookup | |
264 | * | |
44f6c012 | 265 | * PARAMETERS: scope_info - Current scope info block |
1da177e4 LT |
266 | * Pathname - Search pathname, in internal format |
267 | * (as represented in the AML stream) | |
268 | * Type - Type associated with name | |
269 | * interpreter_mode - IMODE_LOAD_PASS2 => add name if not found | |
270 | * Flags - Flags describing the search restrictions | |
271 | * walk_state - Current state of the walk | |
272 | * return_node - Where the Node is placed (if found | |
273 | * or created successfully) | |
274 | * | |
275 | * RETURN: Status | |
276 | * | |
277 | * DESCRIPTION: Find or enter the passed name in the name space. | |
278 | * Log an error if name not found in Exec mode. | |
279 | * | |
280 | * MUTEX: Assumes namespace is locked. | |
281 | * | |
282 | ******************************************************************************/ | |
283 | ||
284 | acpi_status | |
4be44fcd LB |
285 | acpi_ns_lookup(union acpi_generic_state *scope_info, |
286 | char *pathname, | |
287 | acpi_object_type type, | |
288 | acpi_interpreter_mode interpreter_mode, | |
289 | u32 flags, | |
290 | struct acpi_walk_state *walk_state, | |
291 | struct acpi_namespace_node **return_node) | |
1da177e4 | 292 | { |
4be44fcd LB |
293 | acpi_status status; |
294 | char *path = pathname; | |
295 | struct acpi_namespace_node *prefix_node; | |
296 | struct acpi_namespace_node *current_node = NULL; | |
297 | struct acpi_namespace_node *this_node = NULL; | |
298 | u32 num_segments; | |
299 | u32 num_carats; | |
300 | acpi_name simple_name; | |
301 | acpi_object_type type_to_check_for; | |
302 | acpi_object_type this_search_type; | |
303 | u32 search_parent_flag = ACPI_NS_SEARCH_PARENT; | |
958dd242 | 304 | u32 local_flags; |
4be44fcd | 305 | |
b229cf92 | 306 | ACPI_FUNCTION_TRACE(ns_lookup); |
1da177e4 LT |
307 | |
308 | if (!return_node) { | |
4be44fcd | 309 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
310 | } |
311 | ||
958dd242 | 312 | local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_SEARCH_PARENT); |
1da177e4 | 313 | *return_node = ACPI_ENTRY_NOT_FOUND; |
958dd242 | 314 | acpi_gbl_ns_lookup_count++; |
1da177e4 LT |
315 | |
316 | if (!acpi_gbl_root_node) { | |
4be44fcd | 317 | return_ACPI_STATUS(AE_NO_NAMESPACE); |
1da177e4 LT |
318 | } |
319 | ||
320 | /* | |
321 | * Get the prefix scope. | |
322 | * A null scope means use the root scope | |
323 | */ | |
4be44fcd LB |
324 | if ((!scope_info) || (!scope_info->scope.node)) { |
325 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |
326 | "Null scope prefix, using root node (%p)\n", | |
327 | acpi_gbl_root_node)); | |
1da177e4 LT |
328 | |
329 | prefix_node = acpi_gbl_root_node; | |
4be44fcd | 330 | } else { |
1da177e4 | 331 | prefix_node = scope_info->scope.node; |
4be44fcd LB |
332 | if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) != |
333 | ACPI_DESC_TYPE_NAMED) { | |
b8e4d893 BM |
334 | ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]", |
335 | prefix_node, | |
336 | acpi_ut_get_descriptor_name(prefix_node))); | |
4be44fcd | 337 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
338 | } |
339 | ||
8313524a BM |
340 | if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) { |
341 | /* | |
342 | * This node might not be a actual "scope" node (such as a | |
343 | * Device/Method, etc.) It could be a Package or other object node. | |
344 | * Backup up the tree to find the containing scope node. | |
345 | */ | |
346 | while (!acpi_ns_opens_scope(prefix_node->type) && | |
347 | prefix_node->type != ACPI_TYPE_ANY) { | |
348 | prefix_node = | |
349 | acpi_ns_get_parent_node(prefix_node); | |
350 | } | |
1da177e4 LT |
351 | } |
352 | } | |
353 | ||
354 | /* Save type TBD: may be no longer necessary */ | |
355 | ||
356 | type_to_check_for = type; | |
357 | ||
358 | /* | |
359 | * Begin examination of the actual pathname | |
360 | */ | |
361 | if (!pathname) { | |
52fc0b02 | 362 | |
1da177e4 LT |
363 | /* A Null name_path is allowed and refers to the root */ |
364 | ||
365 | num_segments = 0; | |
4be44fcd LB |
366 | this_node = acpi_gbl_root_node; |
367 | path = ""; | |
1da177e4 | 368 | |
4be44fcd LB |
369 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
370 | "Null Pathname (Zero segments), Flags=%X\n", | |
371 | flags)); | |
372 | } else { | |
1da177e4 LT |
373 | /* |
374 | * Name pointer is valid (and must be in internal name format) | |
375 | * | |
376 | * Check for scope prefixes: | |
377 | * | |
378 | * As represented in the AML stream, a namepath consists of an | |
379 | * optional scope prefix followed by a name segment part. | |
380 | * | |
381 | * If present, the scope prefix is either a Root Prefix (in | |
382 | * which case the name is fully qualified), or one or more | |
383 | * Parent Prefixes (in which case the name's scope is relative | |
384 | * to the current scope). | |
385 | */ | |
386 | if (*path == (u8) AML_ROOT_PREFIX) { | |
52fc0b02 | 387 | |
1da177e4 LT |
388 | /* Pathname is fully qualified, start from the root */ |
389 | ||
390 | this_node = acpi_gbl_root_node; | |
391 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
392 | ||
393 | /* Point to name segment part */ | |
394 | ||
395 | path++; | |
396 | ||
4be44fcd LB |
397 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
398 | "Path is absolute from root [%p]\n", | |
399 | this_node)); | |
400 | } else { | |
1da177e4 LT |
401 | /* Pathname is relative to current scope, start there */ |
402 | ||
4be44fcd LB |
403 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
404 | "Searching relative to prefix scope [%4.4s] (%p)\n", | |
405 | acpi_ut_get_node_name(prefix_node), | |
406 | prefix_node)); | |
1da177e4 LT |
407 | |
408 | /* | |
409 | * Handle multiple Parent Prefixes (carat) by just getting | |
410 | * the parent node for each prefix instance. | |
411 | */ | |
412 | this_node = prefix_node; | |
413 | num_carats = 0; | |
414 | while (*path == (u8) AML_PARENT_PREFIX) { | |
52fc0b02 | 415 | |
1da177e4 LT |
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++; | |
4be44fcd | 428 | this_node = acpi_ns_get_parent_node(this_node); |
1da177e4 | 429 | if (!this_node) { |
52fc0b02 | 430 | |
1da177e4 LT |
431 | /* Current scope has no parent scope */ |
432 | ||
b8e4d893 BM |
433 | ACPI_ERROR((AE_INFO, |
434 | "ACPI path has too many parent prefixes (^) - reached beyond root node")); | |
4be44fcd | 435 | return_ACPI_STATUS(AE_NOT_FOUND); |
1da177e4 LT |
436 | } |
437 | } | |
438 | ||
439 | if (search_parent_flag == ACPI_NS_NO_UPSEARCH) { | |
4be44fcd LB |
440 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
441 | "Search scope is [%4.4s], path has %d carat(s)\n", | |
442 | acpi_ut_get_node_name | |
443 | (this_node), num_carats)); | |
1da177e4 LT |
444 | } |
445 | } | |
446 | ||
447 | /* | |
448 | * Determine the number of ACPI name segments in this pathname. | |
449 | * | |
450 | * The segment part consists of either: | |
451 | * - A Null name segment (0) | |
452 | * - A dual_name_prefix followed by two 4-byte name segments | |
453 | * - A multi_name_prefix followed by a byte indicating the | |
454 | * number of segments and the segments themselves. | |
455 | * - A single 4-byte name segment | |
456 | * | |
457 | * Examine the name prefix opcode, if any, to determine the number of | |
458 | * segments. | |
459 | */ | |
460 | switch (*path) { | |
461 | case 0: | |
462 | /* | |
463 | * Null name after a root or parent prefixes. We already | |
464 | * have the correct target node and there are no name segments. | |
465 | */ | |
466 | num_segments = 0; | |
467 | type = this_node->type; | |
468 | ||
4be44fcd LB |
469 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
470 | "Prefix-only Pathname (Zero name segments), Flags=%X\n", | |
471 | flags)); | |
1da177e4 LT |
472 | break; |
473 | ||
474 | case AML_DUAL_NAME_PREFIX: | |
475 | ||
476 | /* More than one name_seg, search rules do not apply */ | |
477 | ||
478 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
479 | ||
480 | /* Two segments, point to first name segment */ | |
481 | ||
482 | num_segments = 2; | |
483 | path++; | |
484 | ||
4be44fcd LB |
485 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
486 | "Dual Pathname (2 segments, Flags=%X)\n", | |
487 | flags)); | |
1da177e4 LT |
488 | break; |
489 | ||
490 | case AML_MULTI_NAME_PREFIX_OP: | |
491 | ||
492 | /* More than one name_seg, search rules do not apply */ | |
493 | ||
494 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
495 | ||
496 | /* Extract segment count, point to first name segment */ | |
497 | ||
498 | path++; | |
4be44fcd | 499 | num_segments = (u32) (u8) * path; |
1da177e4 LT |
500 | path++; |
501 | ||
4be44fcd | 502 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
50eca3eb | 503 | "Multi Pathname (%d Segments, Flags=%X)\n", |
4be44fcd | 504 | num_segments, flags)); |
1da177e4 LT |
505 | break; |
506 | ||
507 | default: | |
508 | /* | |
509 | * Not a Null name, no Dual or Multi prefix, hence there is | |
510 | * only one name segment and Pathname is already pointing to it. | |
511 | */ | |
512 | num_segments = 1; | |
513 | ||
4be44fcd LB |
514 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
515 | "Simple Pathname (1 segment, Flags=%X)\n", | |
516 | flags)); | |
1da177e4 LT |
517 | break; |
518 | } | |
519 | ||
4be44fcd | 520 | ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path)); |
1da177e4 LT |
521 | } |
522 | ||
1da177e4 LT |
523 | /* |
524 | * Search namespace for each segment of the name. Loop through and | |
525 | * verify (or add to the namespace) each name segment. | |
526 | * | |
527 | * The object type is significant only at the last name | |
528 | * segment. (We don't care about the types along the path, only | |
529 | * the type of the final target object.) | |
530 | */ | |
531 | this_search_type = ACPI_TYPE_ANY; | |
532 | current_node = this_node; | |
533 | while (num_segments && current_node) { | |
534 | num_segments--; | |
535 | if (!num_segments) { | |
536 | /* | |
537 | * This is the last segment, enable typechecking | |
538 | */ | |
539 | this_search_type = type; | |
540 | ||
541 | /* | |
542 | * Only allow automatic parent search (search rules) if the caller | |
543 | * requested it AND we have a single, non-fully-qualified name_seg | |
544 | */ | |
545 | if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) && | |
4be44fcd | 546 | (flags & ACPI_NS_SEARCH_PARENT)) { |
1da177e4 LT |
547 | local_flags |= ACPI_NS_SEARCH_PARENT; |
548 | } | |
549 | ||
550 | /* Set error flag according to caller */ | |
551 | ||
552 | if (flags & ACPI_NS_ERROR_IF_FOUND) { | |
553 | local_flags |= ACPI_NS_ERROR_IF_FOUND; | |
554 | } | |
555 | } | |
556 | ||
557 | /* Extract one ACPI name from the front of the pathname */ | |
558 | ||
4be44fcd | 559 | ACPI_MOVE_32_TO_32(&simple_name, path); |
1da177e4 LT |
560 | |
561 | /* Try to find the single (4 character) ACPI name */ | |
562 | ||
4be44fcd LB |
563 | status = |
564 | acpi_ns_search_and_enter(simple_name, walk_state, | |
565 | current_node, interpreter_mode, | |
566 | this_search_type, local_flags, | |
567 | &this_node); | |
568 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 569 | if (status == AE_NOT_FOUND) { |
52fc0b02 | 570 | |
1da177e4 LT |
571 | /* Name not found in ACPI namespace */ |
572 | ||
4be44fcd LB |
573 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
574 | "Name [%4.4s] not found in scope [%4.4s] %p\n", | |
575 | (char *)&simple_name, | |
576 | (char *)¤t_node->name, | |
577 | current_node)); | |
1da177e4 LT |
578 | } |
579 | ||
580 | *return_node = this_node; | |
4be44fcd | 581 | return_ACPI_STATUS(status); |
1da177e4 LT |
582 | } |
583 | ||
53cf1744 BM |
584 | /* More segments to follow? */ |
585 | ||
586 | if (num_segments > 0) { | |
587 | /* | |
588 | * If we have an alias to an object that opens a scope (such as a | |
589 | * device or processor), we need to dereference the alias here so that | |
590 | * we can access any children of the original node (via the remaining | |
591 | * segments). | |
592 | */ | |
593 | if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) { | |
594 | if (acpi_ns_opens_scope | |
595 | (((struct acpi_namespace_node *)this_node-> | |
596 | object)->type)) { | |
597 | this_node = | |
598 | (struct acpi_namespace_node *) | |
599 | this_node->object; | |
600 | } | |
601 | } | |
1da177e4 LT |
602 | } |
603 | ||
53cf1744 BM |
604 | /* Special handling for the last segment (num_segments == 0) */ |
605 | ||
606 | else { | |
607 | /* | |
608 | * Sanity typecheck of the target object: | |
609 | * | |
610 | * If 1) This is the last segment (num_segments == 0) | |
611 | * 2) And we are looking for a specific type | |
612 | * (Not checking for TYPE_ANY) | |
613 | * 3) Which is not an alias | |
614 | * 4) Which is not a local type (TYPE_SCOPE) | |
615 | * 5) And the type of target object is known (not TYPE_ANY) | |
616 | * 6) And target object does not match what we are looking for | |
617 | * | |
618 | * Then we have a type mismatch. Just warn and ignore it. | |
619 | */ | |
620 | if ((type_to_check_for != ACPI_TYPE_ANY) && | |
621 | (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) && | |
622 | (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS) | |
623 | && (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE) | |
624 | && (this_node->type != ACPI_TYPE_ANY) | |
625 | && (this_node->type != type_to_check_for)) { | |
626 | ||
627 | /* Complain about a type mismatch */ | |
628 | ||
629 | ACPI_WARNING((AE_INFO, | |
630 | "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", | |
631 | ACPI_CAST_PTR(char, &simple_name), | |
632 | acpi_ut_get_type_name(this_node-> | |
633 | type), | |
634 | acpi_ut_get_type_name | |
635 | (type_to_check_for))); | |
636 | } | |
637 | ||
638 | /* | |
639 | * If this is the last name segment and we are not looking for a | |
640 | * specific type, but the type of found object is known, use that type | |
641 | * to (later) see if it opens a scope. | |
642 | */ | |
643 | if (type == ACPI_TYPE_ANY) { | |
644 | type = this_node->type; | |
645 | } | |
1da177e4 LT |
646 | } |
647 | ||
648 | /* Point to next name segment and make this node current */ | |
649 | ||
650 | path += ACPI_NAME_SIZE; | |
651 | current_node = this_node; | |
652 | } | |
653 | ||
654 | /* | |
655 | * Always check if we need to open a new scope | |
656 | */ | |
657 | if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) { | |
658 | /* | |
659 | * If entry is a type which opens a scope, push the new scope on the | |
660 | * scope stack. | |
661 | */ | |
4be44fcd LB |
662 | if (acpi_ns_opens_scope(type)) { |
663 | status = | |
664 | acpi_ds_scope_stack_push(this_node, type, | |
665 | walk_state); | |
666 | if (ACPI_FAILURE(status)) { | |
667 | return_ACPI_STATUS(status); | |
1da177e4 LT |
668 | } |
669 | } | |
670 | } | |
671 | ||
672 | *return_node = this_node; | |
4be44fcd | 673 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 674 | } |