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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: nsaccess - Top-level functions for accessing ACPI namespace | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
c8100dc4 | 8 | * Copyright (C) 2000 - 2016, 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 | ||
4fa4616e | 105 | if (!strcmp(init_val->name, "_OSI") |
4be44fcd | 106 | && !acpi_gbl_create_osi_method) { |
1da177e4 LT |
107 | continue; |
108 | } | |
109 | ||
0dfaaa3d | 110 | status = |
fee4ab9c JK |
111 | acpi_ns_lookup(NULL, ACPI_CAST_PTR(char, init_val->name), |
112 | init_val->type, ACPI_IMODE_LOAD_PASS2, | |
113 | ACPI_NS_NO_UPSEARCH, NULL, &new_node); | |
267d672a | 114 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
115 | ACPI_EXCEPTION((AE_INFO, status, |
116 | "Could not create predefined name %s", | |
117 | init_val->name)); | |
267d672a | 118 | continue; |
1da177e4 LT |
119 | } |
120 | ||
121 | /* | |
d4913dc6 BM |
122 | * Name entered successfully. If entry in pre_defined_names[] specifies |
123 | * an initial value, create the initial value. | |
1da177e4 LT |
124 | */ |
125 | if (init_val->val) { | |
4be44fcd LB |
126 | status = acpi_os_predefined_override(init_val, &val); |
127 | if (ACPI_FAILURE(status)) { | |
b8e4d893 BM |
128 | ACPI_ERROR((AE_INFO, |
129 | "Could not override predefined %s", | |
130 | init_val->name)); | |
1da177e4 LT |
131 | } |
132 | ||
133 | if (!val) { | |
134 | val = init_val->val; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Entry requests an initial value, allocate a | |
139 | * descriptor for it. | |
140 | */ | |
4be44fcd LB |
141 | obj_desc = |
142 | acpi_ut_create_internal_object(init_val->type); | |
1da177e4 LT |
143 | if (!obj_desc) { |
144 | status = AE_NO_MEMORY; | |
145 | goto unlock_and_exit; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Convert value string from table entry to | |
150 | * internal representation. Only types actually | |
151 | * used for initial values are implemented here. | |
152 | */ | |
153 | switch (init_val->type) { | |
154 | case ACPI_TYPE_METHOD: | |
1d1ea1b7 | 155 | |
4be44fcd LB |
156 | obj_desc->method.param_count = |
157 | (u8) ACPI_TO_INTEGER(val); | |
1da177e4 LT |
158 | obj_desc->common.flags |= AOPOBJ_DATA_VALID; |
159 | ||
0c9938cc | 160 | #if defined (ACPI_ASL_COMPILER) |
1da177e4 | 161 | |
ba494bee | 162 | /* Save the parameter count for the iASL compiler */ |
0c9938cc RM |
163 | |
164 | new_node->value = obj_desc->method.param_count; | |
1da177e4 LT |
165 | #else |
166 | /* Mark this as a very SPECIAL method */ | |
167 | ||
26294842 LM |
168 | obj_desc->method.info_flags = |
169 | ACPI_METHOD_INTERNAL_ONLY; | |
170 | obj_desc->method.dispatch.implementation = | |
4be44fcd | 171 | acpi_ut_osi_implementation; |
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 | ||
d4913dc6 BM |
182 | /* Build an object around the static string */ |
183 | ||
4fa4616e | 184 | obj_desc->string.length = (u32)strlen(val); |
1da177e4 LT |
185 | obj_desc->string.pointer = val; |
186 | obj_desc->common.flags |= AOPOBJ_STATIC_POINTER; | |
187 | break; | |
188 | ||
1da177e4 LT |
189 | case ACPI_TYPE_MUTEX: |
190 | ||
191 | obj_desc->mutex.node = new_node; | |
4be44fcd LB |
192 | obj_desc->mutex.sync_level = |
193 | (u8) (ACPI_TO_INTEGER(val) - 1); | |
1da177e4 | 194 | |
c81da666 BM |
195 | /* Create a mutex */ |
196 | ||
197 | status = | |
198 | acpi_os_create_mutex(&obj_desc->mutex. | |
199 | os_mutex); | |
200 | if (ACPI_FAILURE(status)) { | |
201 | acpi_ut_remove_reference(obj_desc); | |
202 | goto unlock_and_exit; | |
203 | } | |
967440e3 | 204 | |
c81da666 | 205 | /* Special case for ACPI Global Lock */ |
1da177e4 | 206 | |
4fa4616e | 207 | if (strcmp(init_val->name, "_GL_") == 0) { |
ba886cd4 | 208 | acpi_gbl_global_lock_mutex = obj_desc; |
967440e3 | 209 | |
c81da666 | 210 | /* Create additional counting semaphore for global lock */ |
1da177e4 | 211 | |
967440e3 | 212 | status = |
73ca0fbc | 213 | acpi_os_create_semaphore(1, 0, |
c81da666 | 214 | &acpi_gbl_global_lock_semaphore); |
4be44fcd LB |
215 | if (ACPI_FAILURE(status)) { |
216 | acpi_ut_remove_reference | |
217 | (obj_desc); | |
1da177e4 LT |
218 | goto unlock_and_exit; |
219 | } | |
220 | } | |
221 | break; | |
222 | ||
1da177e4 LT |
223 | default: |
224 | ||
b8e4d893 | 225 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 226 | "Unsupported initial type value 0x%X", |
b8e4d893 | 227 | init_val->type)); |
4be44fcd | 228 | acpi_ut_remove_reference(obj_desc); |
1da177e4 LT |
229 | obj_desc = NULL; |
230 | continue; | |
231 | } | |
232 | ||
233 | /* Store pointer to value descriptor in the Node */ | |
234 | ||
4be44fcd | 235 | status = acpi_ns_attach_object(new_node, obj_desc, |
3371c19c | 236 | obj_desc->common.type); |
1da177e4 LT |
237 | |
238 | /* Remove local reference to the object */ | |
239 | ||
4be44fcd | 240 | acpi_ut_remove_reference(obj_desc); |
1da177e4 LT |
241 | } |
242 | } | |
243 | ||
10622bf8 | 244 | unlock_and_exit: |
4be44fcd | 245 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 LT |
246 | |
247 | /* Save a handle to "_GPE", it is always present */ | |
248 | ||
4be44fcd | 249 | if (ACPI_SUCCESS(status)) { |
4119532c BM |
250 | status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, |
251 | &acpi_gbl_fadt_gpe_device); | |
1da177e4 LT |
252 | } |
253 | ||
4be44fcd | 254 | return_ACPI_STATUS(status); |
1da177e4 LT |
255 | } |
256 | ||
1da177e4 LT |
257 | /******************************************************************************* |
258 | * | |
259 | * FUNCTION: acpi_ns_lookup | |
260 | * | |
44f6c012 | 261 | * PARAMETERS: scope_info - Current scope info block |
ba494bee | 262 | * pathname - Search pathname, in internal format |
1da177e4 | 263 | * (as represented in the AML stream) |
ba494bee | 264 | * type - Type associated with name |
1da177e4 | 265 | * interpreter_mode - IMODE_LOAD_PASS2 => add name if not found |
ba494bee | 266 | * flags - Flags describing the search restrictions |
1da177e4 LT |
267 | * walk_state - Current state of the walk |
268 | * return_node - Where the Node is placed (if found | |
269 | * or created successfully) | |
270 | * | |
271 | * RETURN: Status | |
272 | * | |
273 | * DESCRIPTION: Find or enter the passed name in the name space. | |
274 | * Log an error if name not found in Exec mode. | |
275 | * | |
276 | * MUTEX: Assumes namespace is locked. | |
277 | * | |
278 | ******************************************************************************/ | |
279 | ||
280 | acpi_status | |
4be44fcd LB |
281 | acpi_ns_lookup(union acpi_generic_state *scope_info, |
282 | char *pathname, | |
283 | acpi_object_type type, | |
284 | acpi_interpreter_mode interpreter_mode, | |
285 | u32 flags, | |
286 | struct acpi_walk_state *walk_state, | |
287 | struct acpi_namespace_node **return_node) | |
1da177e4 | 288 | { |
4be44fcd LB |
289 | acpi_status status; |
290 | char *path = pathname; | |
291 | struct acpi_namespace_node *prefix_node; | |
292 | struct acpi_namespace_node *current_node = NULL; | |
293 | struct acpi_namespace_node *this_node = NULL; | |
294 | u32 num_segments; | |
295 | u32 num_carats; | |
296 | acpi_name simple_name; | |
297 | acpi_object_type type_to_check_for; | |
298 | acpi_object_type this_search_type; | |
299 | u32 search_parent_flag = ACPI_NS_SEARCH_PARENT; | |
958dd242 | 300 | u32 local_flags; |
4be44fcd | 301 | |
b229cf92 | 302 | ACPI_FUNCTION_TRACE(ns_lookup); |
1da177e4 LT |
303 | |
304 | if (!return_node) { | |
4be44fcd | 305 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
306 | } |
307 | ||
8f6f0361 LZ |
308 | local_flags = flags & |
309 | ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND | | |
310 | ACPI_NS_SEARCH_PARENT); | |
1da177e4 | 311 | *return_node = ACPI_ENTRY_NOT_FOUND; |
958dd242 | 312 | acpi_gbl_ns_lookup_count++; |
1da177e4 LT |
313 | |
314 | if (!acpi_gbl_root_node) { | |
4be44fcd | 315 | return_ACPI_STATUS(AE_NO_NAMESPACE); |
1da177e4 LT |
316 | } |
317 | ||
d4913dc6 BM |
318 | /* Get the prefix scope. A null scope means use the root scope */ |
319 | ||
4be44fcd LB |
320 | if ((!scope_info) || (!scope_info->scope.node)) { |
321 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |
322 | "Null scope prefix, using root node (%p)\n", | |
323 | acpi_gbl_root_node)); | |
1da177e4 LT |
324 | |
325 | prefix_node = acpi_gbl_root_node; | |
4be44fcd | 326 | } else { |
1da177e4 | 327 | prefix_node = scope_info->scope.node; |
4be44fcd LB |
328 | if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) != |
329 | ACPI_DESC_TYPE_NAMED) { | |
b8e4d893 BM |
330 | ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]", |
331 | prefix_node, | |
332 | acpi_ut_get_descriptor_name(prefix_node))); | |
4be44fcd | 333 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
334 | } |
335 | ||
8313524a BM |
336 | if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) { |
337 | /* | |
338 | * This node might not be a actual "scope" node (such as a | |
d4913dc6 BM |
339 | * Device/Method, etc.) It could be a Package or other object |
340 | * node. Backup up the tree to find the containing scope node. | |
8313524a BM |
341 | */ |
342 | while (!acpi_ns_opens_scope(prefix_node->type) && | |
343 | prefix_node->type != ACPI_TYPE_ANY) { | |
c45b5c09 | 344 | prefix_node = prefix_node->parent; |
8313524a | 345 | } |
1da177e4 LT |
346 | } |
347 | } | |
348 | ||
d4913dc6 | 349 | /* Save type. TBD: may be no longer necessary */ |
1da177e4 LT |
350 | |
351 | type_to_check_for = type; | |
352 | ||
353 | /* | |
354 | * Begin examination of the actual pathname | |
355 | */ | |
356 | if (!pathname) { | |
52fc0b02 | 357 | |
1da177e4 LT |
358 | /* A Null name_path is allowed and refers to the root */ |
359 | ||
360 | num_segments = 0; | |
4be44fcd LB |
361 | this_node = acpi_gbl_root_node; |
362 | path = ""; | |
1da177e4 | 363 | |
4be44fcd LB |
364 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
365 | "Null Pathname (Zero segments), Flags=%X\n", | |
366 | flags)); | |
367 | } else { | |
1da177e4 LT |
368 | /* |
369 | * Name pointer is valid (and must be in internal name format) | |
370 | * | |
371 | * Check for scope prefixes: | |
372 | * | |
373 | * As represented in the AML stream, a namepath consists of an | |
374 | * optional scope prefix followed by a name segment part. | |
375 | * | |
376 | * If present, the scope prefix is either a Root Prefix (in | |
377 | * which case the name is fully qualified), or one or more | |
378 | * Parent Prefixes (in which case the name's scope is relative | |
379 | * to the current scope). | |
380 | */ | |
381 | if (*path == (u8) AML_ROOT_PREFIX) { | |
52fc0b02 | 382 | |
1da177e4 LT |
383 | /* Pathname is fully qualified, start from the root */ |
384 | ||
385 | this_node = acpi_gbl_root_node; | |
386 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
387 | ||
388 | /* Point to name segment part */ | |
389 | ||
390 | path++; | |
391 | ||
4be44fcd LB |
392 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
393 | "Path is absolute from root [%p]\n", | |
394 | this_node)); | |
395 | } else { | |
1da177e4 LT |
396 | /* Pathname is relative to current scope, start there */ |
397 | ||
4be44fcd LB |
398 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
399 | "Searching relative to prefix scope [%4.4s] (%p)\n", | |
400 | acpi_ut_get_node_name(prefix_node), | |
401 | prefix_node)); | |
1da177e4 LT |
402 | |
403 | /* | |
404 | * Handle multiple Parent Prefixes (carat) by just getting | |
405 | * the parent node for each prefix instance. | |
406 | */ | |
407 | this_node = prefix_node; | |
408 | num_carats = 0; | |
409 | while (*path == (u8) AML_PARENT_PREFIX) { | |
52fc0b02 | 410 | |
1da177e4 LT |
411 | /* Name is fully qualified, no search rules apply */ |
412 | ||
413 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
d4913dc6 | 414 | |
1da177e4 LT |
415 | /* |
416 | * Point past this prefix to the name segment | |
417 | * part or the next Parent Prefix | |
418 | */ | |
419 | path++; | |
420 | ||
421 | /* Backup to the parent node */ | |
422 | ||
423 | num_carats++; | |
c45b5c09 | 424 | this_node = this_node->parent; |
1da177e4 | 425 | if (!this_node) { |
52fc0b02 | 426 | |
1da177e4 LT |
427 | /* Current scope has no parent scope */ |
428 | ||
b8e4d893 | 429 | ACPI_ERROR((AE_INFO, |
f28eb9f5 BM |
430 | "%s: Path has too many parent prefixes (^) " |
431 | "- reached beyond root node", | |
432 | pathname)); | |
4be44fcd | 433 | return_ACPI_STATUS(AE_NOT_FOUND); |
1da177e4 LT |
434 | } |
435 | } | |
436 | ||
437 | if (search_parent_flag == ACPI_NS_NO_UPSEARCH) { | |
4be44fcd | 438 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
b27d6597 | 439 | "Search scope is [%4.4s], path has %u carat(s)\n", |
4be44fcd LB |
440 | acpi_ut_get_node_name |
441 | (this_node), num_carats)); | |
1da177e4 LT |
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 | ||
4be44fcd LB |
467 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
468 | "Prefix-only Pathname (Zero name segments), Flags=%X\n", | |
469 | flags)); | |
1da177e4 LT |
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 | ||
4be44fcd LB |
483 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
484 | "Dual Pathname (2 segments, Flags=%X)\n", | |
485 | flags)); | |
1da177e4 LT |
486 | break; |
487 | ||
488 | case AML_MULTI_NAME_PREFIX_OP: | |
489 | ||
490 | /* More than one name_seg, search rules do not apply */ | |
491 | ||
492 | search_parent_flag = ACPI_NS_NO_UPSEARCH; | |
493 | ||
494 | /* Extract segment count, point to first name segment */ | |
495 | ||
496 | path++; | |
4be44fcd | 497 | num_segments = (u32) (u8) * path; |
1da177e4 LT |
498 | path++; |
499 | ||
4be44fcd | 500 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
b27d6597 | 501 | "Multi Pathname (%u Segments, Flags=%X)\n", |
4be44fcd | 502 | num_segments, flags)); |
1da177e4 LT |
503 | break; |
504 | ||
505 | default: | |
506 | /* | |
507 | * Not a Null name, no Dual or Multi prefix, hence there is | |
508 | * only one name segment and Pathname is already pointing to it. | |
509 | */ | |
510 | num_segments = 1; | |
511 | ||
4be44fcd LB |
512 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
513 | "Simple Pathname (1 segment, Flags=%X)\n", | |
514 | flags)); | |
1da177e4 LT |
515 | break; |
516 | } | |
517 | ||
4be44fcd | 518 | ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path)); |
1da177e4 LT |
519 | } |
520 | ||
1da177e4 | 521 | /* |
319f8b89 | 522 | * Search namespace for each segment of the name. Loop through and |
1da177e4 LT |
523 | * verify (or add to the namespace) each name segment. |
524 | * | |
525 | * The object type is significant only at the last name | |
319f8b89 | 526 | * segment. (We don't care about the types along the path, only |
1da177e4 LT |
527 | * the type of the final target object.) |
528 | */ | |
529 | this_search_type = ACPI_TYPE_ANY; | |
530 | current_node = this_node; | |
531 | while (num_segments && current_node) { | |
532 | num_segments--; | |
533 | if (!num_segments) { | |
d4913dc6 BM |
534 | |
535 | /* This is the last segment, enable typechecking */ | |
536 | ||
1da177e4 LT |
537 | this_search_type = type; |
538 | ||
539 | /* | |
540 | * Only allow automatic parent search (search rules) if the caller | |
541 | * requested it AND we have a single, non-fully-qualified name_seg | |
542 | */ | |
543 | if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) && | |
4be44fcd | 544 | (flags & ACPI_NS_SEARCH_PARENT)) { |
1da177e4 LT |
545 | local_flags |= ACPI_NS_SEARCH_PARENT; |
546 | } | |
547 | ||
548 | /* Set error flag according to caller */ | |
549 | ||
550 | if (flags & ACPI_NS_ERROR_IF_FOUND) { | |
551 | local_flags |= ACPI_NS_ERROR_IF_FOUND; | |
552 | } | |
8f6f0361 LZ |
553 | |
554 | /* Set override flag according to caller */ | |
555 | ||
556 | if (flags & ACPI_NS_OVERRIDE_IF_FOUND) { | |
557 | local_flags |= ACPI_NS_OVERRIDE_IF_FOUND; | |
558 | } | |
1da177e4 LT |
559 | } |
560 | ||
561 | /* Extract one ACPI name from the front of the pathname */ | |
562 | ||
4be44fcd | 563 | ACPI_MOVE_32_TO_32(&simple_name, path); |
1da177e4 LT |
564 | |
565 | /* Try to find the single (4 character) ACPI name */ | |
566 | ||
4be44fcd LB |
567 | status = |
568 | acpi_ns_search_and_enter(simple_name, walk_state, | |
569 | current_node, interpreter_mode, | |
570 | this_search_type, local_flags, | |
571 | &this_node); | |
572 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 573 | if (status == AE_NOT_FOUND) { |
52fc0b02 | 574 | |
1da177e4 LT |
575 | /* Name not found in ACPI namespace */ |
576 | ||
4be44fcd LB |
577 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
578 | "Name [%4.4s] not found in scope [%4.4s] %p\n", | |
579 | (char *)&simple_name, | |
580 | (char *)¤t_node->name, | |
581 | current_node)); | |
1da177e4 LT |
582 | } |
583 | ||
584 | *return_node = this_node; | |
4be44fcd | 585 | return_ACPI_STATUS(status); |
1da177e4 LT |
586 | } |
587 | ||
53cf1744 BM |
588 | /* More segments to follow? */ |
589 | ||
590 | if (num_segments > 0) { | |
591 | /* | |
592 | * If we have an alias to an object that opens a scope (such as a | |
d4913dc6 BM |
593 | * device or processor), we need to dereference the alias here so |
594 | * that we can access any children of the original node (via the | |
595 | * remaining segments). | |
53cf1744 BM |
596 | */ |
597 | if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) { | |
5572a985 BM |
598 | if (!this_node->object) { |
599 | return_ACPI_STATUS(AE_NOT_EXIST); | |
600 | } | |
601 | ||
53cf1744 | 602 | if (acpi_ns_opens_scope |
d4913dc6 BM |
603 | (((struct acpi_namespace_node *) |
604 | this_node->object)->type)) { | |
53cf1744 BM |
605 | this_node = |
606 | (struct acpi_namespace_node *) | |
607 | this_node->object; | |
608 | } | |
609 | } | |
1da177e4 LT |
610 | } |
611 | ||
53cf1744 BM |
612 | /* Special handling for the last segment (num_segments == 0) */ |
613 | ||
614 | else { | |
615 | /* | |
616 | * Sanity typecheck of the target object: | |
617 | * | |
618 | * If 1) This is the last segment (num_segments == 0) | |
619 | * 2) And we are looking for a specific type | |
620 | * (Not checking for TYPE_ANY) | |
621 | * 3) Which is not an alias | |
622 | * 4) Which is not a local type (TYPE_SCOPE) | |
623 | * 5) And the type of target object is known (not TYPE_ANY) | |
624 | * 6) And target object does not match what we are looking for | |
625 | * | |
626 | * Then we have a type mismatch. Just warn and ignore it. | |
627 | */ | |
628 | if ((type_to_check_for != ACPI_TYPE_ANY) && | |
629 | (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) && | |
630 | (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS) | |
631 | && (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE) | |
632 | && (this_node->type != ACPI_TYPE_ANY) | |
633 | && (this_node->type != type_to_check_for)) { | |
634 | ||
635 | /* Complain about a type mismatch */ | |
636 | ||
637 | ACPI_WARNING((AE_INFO, | |
638 | "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", | |
639 | ACPI_CAST_PTR(char, &simple_name), | |
640 | acpi_ut_get_type_name(this_node-> | |
641 | type), | |
642 | acpi_ut_get_type_name | |
643 | (type_to_check_for))); | |
644 | } | |
645 | ||
646 | /* | |
647 | * If this is the last name segment and we are not looking for a | |
d4913dc6 BM |
648 | * specific type, but the type of found object is known, use that |
649 | * type to (later) see if it opens a scope. | |
53cf1744 BM |
650 | */ |
651 | if (type == ACPI_TYPE_ANY) { | |
652 | type = this_node->type; | |
653 | } | |
1da177e4 LT |
654 | } |
655 | ||
656 | /* Point to next name segment and make this node current */ | |
657 | ||
658 | path += ACPI_NAME_SIZE; | |
659 | current_node = this_node; | |
660 | } | |
661 | ||
d4913dc6 BM |
662 | /* Always check if we need to open a new scope */ |
663 | ||
1da177e4 LT |
664 | if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) { |
665 | /* | |
666 | * If entry is a type which opens a scope, push the new scope on the | |
667 | * scope stack. | |
668 | */ | |
4be44fcd LB |
669 | if (acpi_ns_opens_scope(type)) { |
670 | status = | |
671 | acpi_ds_scope_stack_push(this_node, type, | |
672 | walk_state); | |
673 | if (ACPI_FAILURE(status)) { | |
674 | return_ACPI_STATUS(status); | |
1da177e4 LT |
675 | } |
676 | } | |
677 | } | |
678 | ||
679 | *return_node = this_node; | |
4be44fcd | 680 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 681 | } |