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[SERIAL] Ensure 8250_pci quirks are not marked __devinit
[linux-2.6/verdex.git] / drivers / acpi / namespace / nsaccess.c
blob1149bc18fb359759ed84a70585a886adb0ad416c
1 /*******************************************************************************
2 *
3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2006, R. Byron Moore
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
44 #include <acpi/acpi.h>
45 #include <acpi/amlcode.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acdispat.h>
48
49 #define _COMPONENT ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsaccess")
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 ******************************************************************************/
65 acpi_status acpi_ns_root_initialize(void)
66 {
67 acpi_status status;
68 const struct acpi_predefined_names *init_val = NULL;
69 struct acpi_namespace_node *new_node;
70 union acpi_operand_object *obj_desc;
71 acpi_string val = NULL;
72
73 ACPI_FUNCTION_TRACE("ns_root_initialize");
74
75 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
76 if (ACPI_FAILURE(status)) {
77 return_ACPI_STATUS(status);
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
97 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
98 "Entering predefined entries into namespace\n"));
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
103 if (!ACPI_STRCMP(init_val->name, "_OSI")
104 && !acpi_gbl_create_osi_method) {
105 continue;
106 }
107
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);
111
112 if (ACPI_FAILURE(status) || (!new_node)) { /* Must be on same line for code converter */
113 ACPI_EXCEPTION((AE_INFO, status,
114 "Could not create predefined name %s",
115 init_val->name));
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) {
124 status = acpi_os_predefined_override(init_val, &val);
125 if (ACPI_FAILURE(status)) {
126 ACPI_ERROR((AE_INFO,
127 "Could not override predefined %s",
128 init_val->name));
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 */
139 obj_desc =
140 acpi_ut_create_internal_object(init_val->type);
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:
153 obj_desc->method.param_count =
154 (u8) ACPI_TO_INTEGER(val);
155 obj_desc->common.flags |= AOPOBJ_DATA_VALID;
156
157 #if defined (ACPI_ASL_COMPILER)
158
159 /* save the parameter count for the i_aSL compiler */
160
161 new_node->value = obj_desc->method.param_count;
162 #else
163 /* Mark this as a very SPECIAL method */
164
165 obj_desc->method.method_flags =
166 AML_METHOD_INTERNAL_ONLY;
167
168 #ifndef ACPI_DUMP_APP
169 obj_desc->method.implementation =
170 acpi_ut_osi_implementation;
171 #endif
172 #endif
173 break;
174
175 case ACPI_TYPE_INTEGER:
176
177 obj_desc->integer.value = ACPI_TO_INTEGER(val);
178 break;
179
180 case ACPI_TYPE_STRING:
181
182 /*
183 * Build an object around the static string
184 */
185 obj_desc->string.length =
186 (u32) ACPI_STRLEN(val);
187 obj_desc->string.pointer = val;
188 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
189 break;
190
191 case ACPI_TYPE_MUTEX:
192
193 obj_desc->mutex.node = new_node;
194 obj_desc->mutex.sync_level =
195 (u8) (ACPI_TO_INTEGER(val) - 1);
196
197 if (ACPI_STRCMP(init_val->name, "_GL_") == 0) {
198 /*
199 * Create a counting semaphore for the
200 * global lock
201 */
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);
209 goto unlock_and_exit;
210 }
211
212 /*
213 * We just created the mutex for the
214 * global lock, save it
215 */
216 acpi_gbl_global_lock_semaphore =
217 obj_desc->mutex.semaphore;
218 } else {
219 /* Create a mutex */
220
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);
228 goto unlock_and_exit;
229 }
230 }
231 break;
232
233 default:
234
235 ACPI_ERROR((AE_INFO,
236 "Unsupported initial type value %X",
237 init_val->type));
238 acpi_ut_remove_reference(obj_desc);
239 obj_desc = NULL;
240 continue;
241 }
242
243 /* Store pointer to value descriptor in the Node */
244
245 status = acpi_ns_attach_object(new_node, obj_desc,
246 ACPI_GET_OBJECT_TYPE
247 (obj_desc));
248
249 /* Remove local reference to the object */
250
251 acpi_ut_remove_reference(obj_desc);
252 }
253 }
254
255 unlock_and_exit:
256 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
257
258 /* Save a handle to "_GPE", it is always present */
259
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);
265 }
266
267 return_ACPI_STATUS(status);
268 }
269
270 /*******************************************************************************
271 *
272 * FUNCTION: acpi_ns_lookup
273 *
274 * PARAMETERS: scope_info - Current scope info block
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
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)
301 {
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");
317
318 if (!return_node) {
319 return_ACPI_STATUS(AE_BAD_PARAMETER);
320 }
321
322 acpi_gbl_ns_lookup_count++;
323 *return_node = ACPI_ENTRY_NOT_FOUND;
324
325 if (!acpi_gbl_root_node) {
326 return_ACPI_STATUS(AE_NO_NAMESPACE);
327 }
328
329 /*
330 * Get the prefix scope.
331 * A null scope means use the root scope
332 */
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));
337
338 prefix_node = acpi_gbl_root_node;
339 } else {
340 prefix_node = scope_info->scope.node;
341 if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
342 ACPI_DESC_TYPE_NAMED) {
343 ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]",
344 prefix_node,
345 acpi_ut_get_descriptor_name(prefix_node)));
346 return_ACPI_STATUS(AE_AML_INTERNAL);
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 */
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);
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;
371 this_node = acpi_gbl_root_node;
372 path = "";
373
374 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
375 "Null Pathname (Zero segments), Flags=%X\n",
376 flags));
377 } else {
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
401 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
402 "Path is absolute from root [%p]\n",
403 this_node));
404 } else {
405 /* Pathname is relative to current scope, start there */
406
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));
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++;
431 this_node = acpi_ns_get_parent_node(this_node);
432 if (!this_node) {
433 /* Current scope has no parent scope */
434
435 ACPI_ERROR((AE_INFO,
436 "ACPI path has too many parent prefixes (^) - reached beyond root node"));
437 return_ACPI_STATUS(AE_NOT_FOUND);
438 }
439 }
440
441 if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
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));
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
471 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
472 "Prefix-only Pathname (Zero name segments), Flags=%X\n",
473 flags));
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
487 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
488 "Dual Pathname (2 segments, Flags=%X)\n",
489 flags));
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++;
501 num_segments = (u32) (u8) * path;
502 path++;
503
504 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
505 "Multi Pathname (%d Segments, Flags=%X)\n",
506 num_segments, flags));
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
516 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
517 "Simple Pathname (1 segment, Flags=%X)\n",
518 flags));
519 break;
520 }
521
522 ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path));
523 }
524
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) &&
548 (flags & ACPI_NS_SEARCH_PARENT)) {
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
561 ACPI_MOVE_32_TO_32(&simple_name, path);
562
563 /* Try to find the single (4 character) ACPI name */
564
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)) {
571 if (status == AE_NOT_FOUND) {
572 /* Name not found in ACPI namespace */
573
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 *)&current_node->name,
578 current_node));
579 }
580
581 *return_node = this_node;
582 return_ACPI_STATUS(status);
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 */
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)) {
605 /* Complain about a type mismatch */
606
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)));
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 */
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);
644 }
645 }
646 }
647
648 *return_node = this_node;
649 return_ACPI_STATUS(AE_OK);
650 }
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