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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / acpi / acpica / nsaccess.c
blob73f98d3fed25e13e1f33ebf5e268d8dc1b971e87
1 /*******************************************************************************
2 *
3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, Intel Corp.
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 "accommon.h"
46 #include "amlcode.h"
47 #include "acnamesp.h"
48 #include "acdispat.h"
49
50 #define _COMPONENT ACPI_NAMESPACE
51 ACPI_MODULE_NAME("nsaccess")
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 ******************************************************************************/
66 acpi_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 * 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
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 /* _OSI is optional for now, will be permanent later */
104
105 if (!strcmp(init_val->name, "_OSI")
106 && !acpi_gbl_create_osi_method) {
107 continue;
108 }
109
110 status =
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);
114 if (ACPI_FAILURE(status)) {
115 ACPI_EXCEPTION((AE_INFO, status,
116 "Could not create predefined name %s",
117 init_val->name));
118 continue;
119 }
120
121 /*
122 * Name entered successfully. If entry in pre_defined_names[] specifies
123 * an initial value, create the initial value.
124 */
125 if (init_val->val) {
126 status = acpi_os_predefined_override(init_val, &val);
127 if (ACPI_FAILURE(status)) {
128 ACPI_ERROR((AE_INFO,
129 "Could not override predefined %s",
130 init_val->name));
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 */
141 obj_desc =
142 acpi_ut_create_internal_object(init_val->type);
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:
155
156 obj_desc->method.param_count =
157 (u8) ACPI_TO_INTEGER(val);
158 obj_desc->common.flags |= AOPOBJ_DATA_VALID;
159
160 #if defined (ACPI_ASL_COMPILER)
161
162 /* Save the parameter count for the iASL compiler */
163
164 new_node->value = obj_desc->method.param_count;
165 #else
166 /* Mark this as a very SPECIAL method */
167
168 obj_desc->method.info_flags =
169 ACPI_METHOD_INTERNAL_ONLY;
170 obj_desc->method.dispatch.implementation =
171 acpi_ut_osi_implementation;
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 /* Build an object around the static string */
183
184 obj_desc->string.length = (u32)strlen(val);
185 obj_desc->string.pointer = val;
186 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
187 break;
188
189 case ACPI_TYPE_MUTEX:
190
191 obj_desc->mutex.node = new_node;
192 obj_desc->mutex.sync_level =
193 (u8) (ACPI_TO_INTEGER(val) - 1);
194
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 }
204
205 /* Special case for ACPI Global Lock */
206
207 if (strcmp(init_val->name, "_GL_") == 0) {
208 acpi_gbl_global_lock_mutex = obj_desc;
209
210 /* Create additional counting semaphore for global lock */
211
212 status =
213 acpi_os_create_semaphore(1, 0,
214 &acpi_gbl_global_lock_semaphore);
215 if (ACPI_FAILURE(status)) {
216 acpi_ut_remove_reference
217 (obj_desc);
218 goto unlock_and_exit;
219 }
220 }
221 break;
222
223 default:
224
225 ACPI_ERROR((AE_INFO,
226 "Unsupported initial type value 0x%X",
227 init_val->type));
228 acpi_ut_remove_reference(obj_desc);
229 obj_desc = NULL;
230 continue;
231 }
232
233 /* Store pointer to value descriptor in the Node */
234
235 status = acpi_ns_attach_object(new_node, obj_desc,
236 obj_desc->common.type);
237
238 /* Remove local reference to the object */
239
240 acpi_ut_remove_reference(obj_desc);
241 }
242 }
243
244 unlock_and_exit:
245 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
246
247 /* Save a handle to "_GPE", it is always present */
248
249 if (ACPI_SUCCESS(status)) {
250 status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
251 &acpi_gbl_fadt_gpe_device);
252 }
253
254 return_ACPI_STATUS(status);
255 }
256
257 /*******************************************************************************
258 *
259 * FUNCTION: acpi_ns_lookup
260 *
261 * PARAMETERS: scope_info - Current scope info block
262 * pathname - Search pathname, in internal format
263 * (as represented in the AML stream)
264 * type - Type associated with name
265 * interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
266 * flags - Flags describing the search restrictions
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
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)
288 {
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;
300 u32 local_flags;
301
302 ACPI_FUNCTION_TRACE(ns_lookup);
303
304 if (!return_node) {
305 return_ACPI_STATUS(AE_BAD_PARAMETER);
306 }
307
308 local_flags = flags &
309 ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND |
310 ACPI_NS_SEARCH_PARENT);
311 *return_node = ACPI_ENTRY_NOT_FOUND;
312 acpi_gbl_ns_lookup_count++;
313
314 if (!acpi_gbl_root_node) {
315 return_ACPI_STATUS(AE_NO_NAMESPACE);
316 }
317
318 /* Get the prefix scope. A null scope means use the root scope */
319
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));
324
325 prefix_node = acpi_gbl_root_node;
326 } else {
327 prefix_node = scope_info->scope.node;
328 if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
329 ACPI_DESC_TYPE_NAMED) {
330 ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]",
331 prefix_node,
332 acpi_ut_get_descriptor_name(prefix_node)));
333 return_ACPI_STATUS(AE_AML_INTERNAL);
334 }
335
336 if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) {
337 /*
338 * This node might not be a actual "scope" node (such as a
339 * Device/Method, etc.) It could be a Package or other object
340 * node. Backup up the tree to find the containing scope node.
341 */
342 while (!acpi_ns_opens_scope(prefix_node->type) &&
343 prefix_node->type != ACPI_TYPE_ANY) {
344 prefix_node = prefix_node->parent;
345 }
346 }
347 }
348
349 /* Save type. TBD: may be no longer necessary */
350
351 type_to_check_for = type;
352
353 /*
354 * Begin examination of the actual pathname
355 */
356 if (!pathname) {
357
358 /* A Null name_path is allowed and refers to the root */
359
360 num_segments = 0;
361 this_node = acpi_gbl_root_node;
362 path = "";
363
364 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
365 "Null Pathname (Zero segments), Flags=%X\n",
366 flags));
367 } else {
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) {
382
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
392 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
393 "Path is absolute from root [%p]\n",
394 this_node));
395 } else {
396 /* Pathname is relative to current scope, start there */
397
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));
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) {
410
411 /* Name is fully qualified, no search rules apply */
412
413 search_parent_flag = ACPI_NS_NO_UPSEARCH;
414
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++;
424 this_node = this_node->parent;
425 if (!this_node) {
426
427 /* Current scope has no parent scope */
428
429 ACPI_ERROR((AE_INFO,
430 "%s: Path has too many parent prefixes (^) "
431 "- reached beyond root node",
432 pathname));
433 return_ACPI_STATUS(AE_NOT_FOUND);
434 }
435 }
436
437 if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
438 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
439 "Search scope is [%4.4s], path has %u carat(s)\n",
440 acpi_ut_get_node_name
441 (this_node), num_carats));
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
467 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
468 "Prefix-only Pathname (Zero name segments), Flags=%X\n",
469 flags));
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
483 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
484 "Dual Pathname (2 segments, Flags=%X)\n",
485 flags));
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++;
497 num_segments = (u32) (u8) * path;
498 path++;
499
500 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
501 "Multi Pathname (%u Segments, Flags=%X)\n",
502 num_segments, flags));
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
512 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
513 "Simple Pathname (1 segment, Flags=%X)\n",
514 flags));
515 break;
516 }
517
518 ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path));
519 }
520
521 /*
522 * Search namespace for each segment of the name. Loop through and
523 * verify (or add to the namespace) each name segment.
524 *
525 * The object type is significant only at the last name
526 * segment. (We don't care about the types along the path, only
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) {
534
535 /* This is the last segment, enable typechecking */
536
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) &&
544 (flags & ACPI_NS_SEARCH_PARENT)) {
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 }
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 }
559 }
560
561 /* Extract one ACPI name from the front of the pathname */
562
563 ACPI_MOVE_32_TO_32(&simple_name, path);
564
565 /* Try to find the single (4 character) ACPI name */
566
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)) {
573 if (status == AE_NOT_FOUND) {
574
575 /* Name not found in ACPI namespace */
576
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 *)&current_node->name,
581 current_node));
582 }
583
584 *return_node = this_node;
585 return_ACPI_STATUS(status);
586 }
587
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
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).
596 */
597 if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) {
598 if (!this_node->object) {
599 return_ACPI_STATUS(AE_NOT_EXIST);
600 }
601
602 if (acpi_ns_opens_scope
603 (((struct acpi_namespace_node *)
604 this_node->object)->type)) {
605 this_node =
606 (struct acpi_namespace_node *)
607 this_node->object;
608 }
609 }
610 }
611
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
648 * specific type, but the type of found object is known, use that
649 * type to (later) see if it opens a scope.
650 */
651 if (type == ACPI_TYPE_ANY) {
652 type = this_node->type;
653 }
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
662 /* Always check if we need to open a new scope */
663
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 */
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);
675 }
676 }
677 }
678
679 *return_node = this_node;
680 return_ACPI_STATUS(AE_OK);
681 }
Linux with added FPC-III support