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44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "amlcode.h"
47#include "acnamesp.h"
48#include "acdispat.h"
49
50#define _COMPONENT ACPI_NAMESPACE
51ACPI_MODULE_NAME("nsaccess")
52
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65
66acpi_status acpi_ns_root_initialize(void)
67{
68 acpi_status status;
69 const struct acpi_predefined_names *init_val = NULL;
70 struct acpi_namespace_node *new_node;
71 union acpi_operand_object *obj_desc;
72 acpi_string val = NULL;
73
74 ACPI_FUNCTION_TRACE(ns_root_initialize);
75
76 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
77 if (ACPI_FAILURE(status)) {
78 return_ACPI_STATUS(status);
79 }
80
81
82
83
84
85 if (acpi_gbl_root_node) {
86 status = AE_OK;
87 goto unlock_and_exit;
88 }
89
90
91
92
93
94 acpi_gbl_root_node = &acpi_gbl_root_node_struct;
95
96
97
98 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
99 "Entering predefined entries into namespace\n"));
100
101 for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
102
103
104
105 if (!ACPI_STRCMP(init_val->name, "_OSI")
106 && !acpi_gbl_create_osi_method) {
107 continue;
108 }
109
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);
113 if (ACPI_FAILURE(status)) {
114 ACPI_EXCEPTION((AE_INFO, status,
115 "Could not create predefined name %s",
116 init_val->name));
117 continue;
118 }
119
120
121
122
123
124 if (init_val->val) {
125 status = acpi_os_predefined_override(init_val, &val);
126 if (ACPI_FAILURE(status)) {
127 ACPI_ERROR((AE_INFO,
128 "Could not override predefined %s",
129 init_val->name));
130 }
131
132 if (!val) {
133 val = init_val->val;
134 }
135
136
137
138
139
140 obj_desc =
141 acpi_ut_create_internal_object(init_val->type);
142 if (!obj_desc) {
143 status = AE_NO_MEMORY;
144 goto unlock_and_exit;
145 }
146
147
148
149
150
151
152 switch (init_val->type) {
153 case ACPI_TYPE_METHOD:
154
155 obj_desc->method.param_count =
156 (u8) ACPI_TO_INTEGER(val);
157 obj_desc->common.flags |= AOPOBJ_DATA_VALID;
158
159#if defined (ACPI_ASL_COMPILER)
160
161
162
163 new_node->value = obj_desc->method.param_count;
164#else
165
166
167 obj_desc->method.info_flags =
168 ACPI_METHOD_INTERNAL_ONLY;
169 obj_desc->method.dispatch.implementation =
170 acpi_ut_osi_implementation;
171#endif
172 break;
173
174 case ACPI_TYPE_INTEGER:
175
176 obj_desc->integer.value = ACPI_TO_INTEGER(val);
177 break;
178
179 case ACPI_TYPE_STRING:
180
181
182
183 obj_desc->string.length = (u32)ACPI_STRLEN(val);
184 obj_desc->string.pointer = val;
185 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
186 break;
187
188 case ACPI_TYPE_MUTEX:
189
190 obj_desc->mutex.node = new_node;
191 obj_desc->mutex.sync_level =
192 (u8) (ACPI_TO_INTEGER(val) - 1);
193
194
195
196 status =
197 acpi_os_create_mutex(&obj_desc->mutex.
198 os_mutex);
199 if (ACPI_FAILURE(status)) {
200 acpi_ut_remove_reference(obj_desc);
201 goto unlock_and_exit;
202 }
203
204
205
206 if (ACPI_STRCMP(init_val->name, "_GL_") == 0) {
207 acpi_gbl_global_lock_mutex = obj_desc;
208
209
210
211 status =
212 acpi_os_create_semaphore(1, 0,
213 &acpi_gbl_global_lock_semaphore);
214 if (ACPI_FAILURE(status)) {
215 acpi_ut_remove_reference
216 (obj_desc);
217 goto unlock_and_exit;
218 }
219 }
220 break;
221
222 default:
223
224 ACPI_ERROR((AE_INFO,
225 "Unsupported initial type value 0x%X",
226 init_val->type));
227 acpi_ut_remove_reference(obj_desc);
228 obj_desc = NULL;
229 continue;
230 }
231
232
233
234 status = acpi_ns_attach_object(new_node, obj_desc,
235 obj_desc->common.type);
236
237
238
239 acpi_ut_remove_reference(obj_desc);
240 }
241 }
242
243unlock_and_exit:
244 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
245
246
247
248 if (ACPI_SUCCESS(status)) {
249 status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
250 &acpi_gbl_fadt_gpe_device);
251 }
252
253 return_ACPI_STATUS(status);
254}
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278
279acpi_status
280acpi_ns_lookup(union acpi_generic_state *scope_info,
281 char *pathname,
282 acpi_object_type type,
283 acpi_interpreter_mode interpreter_mode,
284 u32 flags,
285 struct acpi_walk_state *walk_state,
286 struct acpi_namespace_node **return_node)
287{
288 acpi_status status;
289 char *path = pathname;
290 struct acpi_namespace_node *prefix_node;
291 struct acpi_namespace_node *current_node = NULL;
292 struct acpi_namespace_node *this_node = NULL;
293 u32 num_segments;
294 u32 num_carats;
295 acpi_name simple_name;
296 acpi_object_type type_to_check_for;
297 acpi_object_type this_search_type;
298 u32 search_parent_flag = ACPI_NS_SEARCH_PARENT;
299 u32 local_flags;
300
301 ACPI_FUNCTION_TRACE(ns_lookup);
302
303 if (!return_node) {
304 return_ACPI_STATUS(AE_BAD_PARAMETER);
305 }
306
307 local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_SEARCH_PARENT);
308 *return_node = ACPI_ENTRY_NOT_FOUND;
309 acpi_gbl_ns_lookup_count++;
310
311 if (!acpi_gbl_root_node) {
312 return_ACPI_STATUS(AE_NO_NAMESPACE);
313 }
314
315
316
317 if ((!scope_info) || (!scope_info->scope.node)) {
318 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
319 "Null scope prefix, using root node (%p)\n",
320 acpi_gbl_root_node));
321
322 prefix_node = acpi_gbl_root_node;
323 } else {
324 prefix_node = scope_info->scope.node;
325 if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
326 ACPI_DESC_TYPE_NAMED) {
327 ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]",
328 prefix_node,
329 acpi_ut_get_descriptor_name(prefix_node)));
330 return_ACPI_STATUS(AE_AML_INTERNAL);
331 }
332
333 if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) {
334
335
336
337
338
339 while (!acpi_ns_opens_scope(prefix_node->type) &&
340 prefix_node->type != ACPI_TYPE_ANY) {
341 prefix_node = prefix_node->parent;
342 }
343 }
344 }
345
346
347
348 type_to_check_for = type;
349
350
351
352
353 if (!pathname) {
354
355
356
357 num_segments = 0;
358 this_node = acpi_gbl_root_node;
359 path = "";
360
361 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
362 "Null Pathname (Zero segments), Flags=%X\n",
363 flags));
364 } else {
365
366
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376
377
378 if (*path == (u8) AML_ROOT_PREFIX) {
379
380
381
382 this_node = acpi_gbl_root_node;
383 search_parent_flag = ACPI_NS_NO_UPSEARCH;
384
385
386
387 path++;
388
389 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
390 "Path is absolute from root [%p]\n",
391 this_node));
392 } else {
393
394
395 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
396 "Searching relative to prefix scope [%4.4s] (%p)\n",
397 acpi_ut_get_node_name(prefix_node),
398 prefix_node));
399
400
401
402
403
404 this_node = prefix_node;
405 num_carats = 0;
406 while (*path == (u8) AML_PARENT_PREFIX) {
407
408
409
410 search_parent_flag = ACPI_NS_NO_UPSEARCH;
411
412
413
414
415
416 path++;
417
418
419
420 num_carats++;
421 this_node = this_node->parent;
422 if (!this_node) {
423
424
425
426 ACPI_ERROR((AE_INFO,
427 "%s: Path has too many parent prefixes (^) "
428 "- reached beyond root node",
429 pathname));
430 return_ACPI_STATUS(AE_NOT_FOUND);
431 }
432 }
433
434 if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
435 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
436 "Search scope is [%4.4s], path has %u carat(s)\n",
437 acpi_ut_get_node_name
438 (this_node), num_carats));
439 }
440 }
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455 switch (*path) {
456 case 0:
457
458
459
460
461 num_segments = 0;
462 type = this_node->type;
463
464 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
465 "Prefix-only Pathname (Zero name segments), Flags=%X\n",
466 flags));
467 break;
468
469 case AML_DUAL_NAME_PREFIX:
470
471
472
473 search_parent_flag = ACPI_NS_NO_UPSEARCH;
474
475
476
477 num_segments = 2;
478 path++;
479
480 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
481 "Dual Pathname (2 segments, Flags=%X)\n",
482 flags));
483 break;
484
485 case AML_MULTI_NAME_PREFIX_OP:
486
487
488
489 search_parent_flag = ACPI_NS_NO_UPSEARCH;
490
491
492
493 path++;
494 num_segments = (u32) (u8) * path;
495 path++;
496
497 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
498 "Multi Pathname (%u Segments, Flags=%X)\n",
499 num_segments, flags));
500 break;
501
502 default:
503
504
505
506
507 num_segments = 1;
508
509 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
510 "Simple Pathname (1 segment, Flags=%X)\n",
511 flags));
512 break;
513 }
514
515 ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path));
516 }
517
518
519
520
521
522
523
524
525
526 this_search_type = ACPI_TYPE_ANY;
527 current_node = this_node;
528 while (num_segments && current_node) {
529 num_segments--;
530 if (!num_segments) {
531
532
533
534 this_search_type = type;
535
536
537
538
539
540 if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) &&
541 (flags & ACPI_NS_SEARCH_PARENT)) {
542 local_flags |= ACPI_NS_SEARCH_PARENT;
543 }
544
545
546
547 if (flags & ACPI_NS_ERROR_IF_FOUND) {
548 local_flags |= ACPI_NS_ERROR_IF_FOUND;
549 }
550 }
551
552
553
554 ACPI_MOVE_32_TO_32(&simple_name, path);
555
556
557
558 status =
559 acpi_ns_search_and_enter(simple_name, walk_state,
560 current_node, interpreter_mode,
561 this_search_type, local_flags,
562 &this_node);
563 if (ACPI_FAILURE(status)) {
564 if (status == AE_NOT_FOUND) {
565
566
567
568 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
569 "Name [%4.4s] not found in scope [%4.4s] %p\n",
570 (char *)&simple_name,
571 (char *)¤t_node->name,
572 current_node));
573 }
574
575 *return_node = this_node;
576 return_ACPI_STATUS(status);
577 }
578
579
580
581 if (num_segments > 0) {
582
583
584
585
586
587
588 if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) {
589 if (!this_node->object) {
590 return_ACPI_STATUS(AE_NOT_EXIST);
591 }
592
593 if (acpi_ns_opens_scope
594 (((struct acpi_namespace_node *)
595 this_node->object)->type)) {
596 this_node =
597 (struct acpi_namespace_node *)
598 this_node->object;
599 }
600 }
601 }
602
603
604
605 else {
606
607
608
609
610
611
612
613
614
615
616
617
618
619 if ((type_to_check_for != ACPI_TYPE_ANY) &&
620 (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) &&
621 (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS)
622 && (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE)
623 && (this_node->type != ACPI_TYPE_ANY)
624 && (this_node->type != type_to_check_for)) {
625
626
627
628 ACPI_WARNING((AE_INFO,
629 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
630 ACPI_CAST_PTR(char, &simple_name),
631 acpi_ut_get_type_name(this_node->
632 type),
633 acpi_ut_get_type_name
634 (type_to_check_for)));
635 }
636
637
638
639
640
641
642 if (type == ACPI_TYPE_ANY) {
643 type = this_node->type;
644 }
645 }
646
647
648
649 path += ACPI_NAME_SIZE;
650 current_node = this_node;
651 }
652
653
654
655 if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) {
656
657
658
659
660 if (acpi_ns_opens_scope(type)) {
661 status =
662 acpi_ds_scope_stack_push(this_node, type,
663 walk_state);
664 if (ACPI_FAILURE(status)) {
665 return_ACPI_STATUS(status);
666 }
667 }
668 }
669
670 *return_node = this_node;
671 return_ACPI_STATUS(AE_OK);
672}
673