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-rw-r--r--drivers/acpi/namespace/nsutils.c1069
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diff --git a/drivers/acpi/namespace/nsutils.c b/drivers/acpi/namespace/nsutils.c
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1/******************************************************************************
2 *
3 * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
4 * parents and siblings and Scope manipulation
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2005, R. Byron Moore
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45
46#include <acpi/acpi.h>
47#include <acpi/acnamesp.h>
48#include <acpi/amlcode.h>
49#include <acpi/actables.h>
50
51#define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME ("nsutils")
53
54
55/*******************************************************************************
56 *
57 * FUNCTION: acpi_ns_report_error
58 *
59 * PARAMETERS: module_name - Caller's module name (for error output)
60 * line_number - Caller's line number (for error output)
61 * component_id - Caller's component ID (for error output)
62 * Message - Error message to use on failure
63 *
64 * RETURN: None
65 *
66 * DESCRIPTION: Print warning message with full pathname
67 *
68 ******************************************************************************/
69
70void
71acpi_ns_report_error (
72 char *module_name,
73 u32 line_number,
74 u32 component_id,
75 char *internal_name,
76 acpi_status lookup_status)
77{
78 acpi_status status;
79 char *name = NULL;
80
81
82 acpi_os_printf ("%8s-%04d: *** Error: Looking up ",
83 module_name, line_number);
84
85 if (lookup_status == AE_BAD_CHARACTER) {
86 /* There is a non-ascii character in the name */
87
88 acpi_os_printf ("[0x%4.4X] (NON-ASCII)\n",
89 *(ACPI_CAST_PTR (u32, internal_name)));
90 }
91 else {
92 /* Convert path to external format */
93
94 status = acpi_ns_externalize_name (ACPI_UINT32_MAX,
95 internal_name, NULL, &name);
96
97 /* Print target name */
98
99 if (ACPI_SUCCESS (status)) {
100 acpi_os_printf ("[%s]", name);
101 }
102 else {
103 acpi_os_printf ("[COULD NOT EXTERNALIZE NAME]");
104 }
105
106 if (name) {
107 ACPI_MEM_FREE (name);
108 }
109 }
110
111 acpi_os_printf (" in namespace, %s\n",
112 acpi_format_exception (lookup_status));
113}
114
115
116/*******************************************************************************
117 *
118 * FUNCTION: acpi_ns_report_method_error
119 *
120 * PARAMETERS: module_name - Caller's module name (for error output)
121 * line_number - Caller's line number (for error output)
122 * component_id - Caller's component ID (for error output)
123 * Message - Error message to use on failure
124 *
125 * RETURN: None
126 *
127 * DESCRIPTION: Print warning message with full pathname
128 *
129 ******************************************************************************/
130
131void
132acpi_ns_report_method_error (
133 char *module_name,
134 u32 line_number,
135 u32 component_id,
136 char *message,
137 struct acpi_namespace_node *prefix_node,
138 char *path,
139 acpi_status method_status)
140{
141 acpi_status status;
142 struct acpi_namespace_node *node = prefix_node;
143
144
145 if (path) {
146 status = acpi_ns_get_node_by_path (path, prefix_node,
147 ACPI_NS_NO_UPSEARCH, &node);
148 if (ACPI_FAILURE (status)) {
149 acpi_os_printf ("report_method_error: Could not get node\n");
150 return;
151 }
152 }
153
154 acpi_os_printf ("%8s-%04d: *** Error: ", module_name, line_number);
155 acpi_ns_print_node_pathname (node, message);
156 acpi_os_printf (", %s\n", acpi_format_exception (method_status));
157}
158
159
160/*******************************************************************************
161 *
162 * FUNCTION: acpi_ns_print_node_pathname
163 *
164 * PARAMETERS: Node - Object
165 * Msg - Prefix message
166 *
167 * DESCRIPTION: Print an object's full namespace pathname
168 * Manages allocation/freeing of a pathname buffer
169 *
170 ******************************************************************************/
171
172void
173acpi_ns_print_node_pathname (
174 struct acpi_namespace_node *node,
175 char *msg)
176{
177 struct acpi_buffer buffer;
178 acpi_status status;
179
180
181 if (!node) {
182 acpi_os_printf ("[NULL NAME]");
183 return;
184 }
185
186 /* Convert handle to full pathname and print it (with supplied message) */
187
188 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
189
190 status = acpi_ns_handle_to_pathname (node, &buffer);
191 if (ACPI_SUCCESS (status)) {
192 if (msg) {
193 acpi_os_printf ("%s ", msg);
194 }
195
196 acpi_os_printf ("[%s] (Node %p)", (char *) buffer.pointer, node);
197 ACPI_MEM_FREE (buffer.pointer);
198 }
199}
200
201
202/*******************************************************************************
203 *
204 * FUNCTION: acpi_ns_valid_root_prefix
205 *
206 * PARAMETERS: Prefix - Character to be checked
207 *
208 * RETURN: TRUE if a valid prefix
209 *
210 * DESCRIPTION: Check if a character is a valid ACPI Root prefix
211 *
212 ******************************************************************************/
213
214u8
215acpi_ns_valid_root_prefix (
216 char prefix)
217{
218
219 return ((u8) (prefix == '\\'));
220}
221
222
223/*******************************************************************************
224 *
225 * FUNCTION: acpi_ns_valid_path_separator
226 *
227 * PARAMETERS: Sep - Character to be checked
228 *
229 * RETURN: TRUE if a valid path separator
230 *
231 * DESCRIPTION: Check if a character is a valid ACPI path separator
232 *
233 ******************************************************************************/
234
235u8
236acpi_ns_valid_path_separator (
237 char sep)
238{
239
240 return ((u8) (sep == '.'));
241}
242
243
244/*******************************************************************************
245 *
246 * FUNCTION: acpi_ns_get_type
247 *
248 * PARAMETERS: Handle - Parent Node to be examined
249 *
250 * RETURN: Type field from Node whose handle is passed
251 *
252 ******************************************************************************/
253
254acpi_object_type
255acpi_ns_get_type (
256 struct acpi_namespace_node *node)
257{
258 ACPI_FUNCTION_TRACE ("ns_get_type");
259
260
261 if (!node) {
262 ACPI_REPORT_WARNING (("ns_get_type: Null Node input pointer\n"));
263 return_VALUE (ACPI_TYPE_ANY);
264 }
265
266 return_VALUE ((acpi_object_type) node->type);
267}
268
269
270/*******************************************************************************
271 *
272 * FUNCTION: acpi_ns_local
273 *
274 * PARAMETERS: Type - A namespace object type
275 *
276 * RETURN: LOCAL if names must be found locally in objects of the
277 * passed type, 0 if enclosing scopes should be searched
278 *
279 ******************************************************************************/
280
281u32
282acpi_ns_local (
283 acpi_object_type type)
284{
285 ACPI_FUNCTION_TRACE ("ns_local");
286
287
288 if (!acpi_ut_valid_object_type (type)) {
289 /* Type code out of range */
290
291 ACPI_REPORT_WARNING (("ns_local: Invalid Object Type\n"));
292 return_VALUE (ACPI_NS_NORMAL);
293 }
294
295 return_VALUE ((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
296}
297
298
299/*******************************************************************************
300 *
301 * FUNCTION: acpi_ns_get_internal_name_length
302 *
303 * PARAMETERS: Info - Info struct initialized with the
304 * external name pointer.
305 *
306 * RETURN: Status
307 *
308 * DESCRIPTION: Calculate the length of the internal (AML) namestring
309 * corresponding to the external (ASL) namestring.
310 *
311 ******************************************************************************/
312
313void
314acpi_ns_get_internal_name_length (
315 struct acpi_namestring_info *info)
316{
317 char *next_external_char;
318 u32 i;
319
320
321 ACPI_FUNCTION_ENTRY ();
322
323
324 next_external_char = info->external_name;
325 info->num_carats = 0;
326 info->num_segments = 0;
327 info->fully_qualified = FALSE;
328
329 /*
330 * For the internal name, the required length is 4 bytes per segment, plus
331 * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
332 * (which is not really needed, but no there's harm in putting it there)
333 *
334 * strlen() + 1 covers the first name_seg, which has no path separator
335 */
336 if (acpi_ns_valid_root_prefix (next_external_char[0])) {
337 info->fully_qualified = TRUE;
338 next_external_char++;
339 }
340 else {
341 /*
342 * Handle Carat prefixes
343 */
344 while (*next_external_char == '^') {
345 info->num_carats++;
346 next_external_char++;
347 }
348 }
349
350 /*
351 * Determine the number of ACPI name "segments" by counting the number of
352 * path separators within the string. Start with one segment since the
353 * segment count is [(# separators) + 1], and zero separators is ok.
354 */
355 if (*next_external_char) {
356 info->num_segments = 1;
357 for (i = 0; next_external_char[i]; i++) {
358 if (acpi_ns_valid_path_separator (next_external_char[i])) {
359 info->num_segments++;
360 }
361 }
362 }
363
364 info->length = (ACPI_NAME_SIZE * info->num_segments) +
365 4 + info->num_carats;
366
367 info->next_external_char = next_external_char;
368}
369
370
371/*******************************************************************************
372 *
373 * FUNCTION: acpi_ns_build_internal_name
374 *
375 * PARAMETERS: Info - Info struct fully initialized
376 *
377 * RETURN: Status
378 *
379 * DESCRIPTION: Construct the internal (AML) namestring
380 * corresponding to the external (ASL) namestring.
381 *
382 ******************************************************************************/
383
384acpi_status
385acpi_ns_build_internal_name (
386 struct acpi_namestring_info *info)
387{
388 u32 num_segments = info->num_segments;
389 char *internal_name = info->internal_name;
390 char *external_name = info->next_external_char;
391 char *result = NULL;
392 acpi_native_uint i;
393
394
395 ACPI_FUNCTION_TRACE ("ns_build_internal_name");
396
397
398 /* Setup the correct prefixes, counts, and pointers */
399
400 if (info->fully_qualified) {
401 internal_name[0] = '\\';
402
403 if (num_segments <= 1) {
404 result = &internal_name[1];
405 }
406 else if (num_segments == 2) {
407 internal_name[1] = AML_DUAL_NAME_PREFIX;
408 result = &internal_name[2];
409 }
410 else {
411 internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
412 internal_name[2] = (char) num_segments;
413 result = &internal_name[3];
414 }
415 }
416 else {
417 /*
418 * Not fully qualified.
419 * Handle Carats first, then append the name segments
420 */
421 i = 0;
422 if (info->num_carats) {
423 for (i = 0; i < info->num_carats; i++) {
424 internal_name[i] = '^';
425 }
426 }
427
428 if (num_segments <= 1) {
429 result = &internal_name[i];
430 }
431 else if (num_segments == 2) {
432 internal_name[i] = AML_DUAL_NAME_PREFIX;
433 result = &internal_name[(acpi_native_uint) (i+1)];
434 }
435 else {
436 internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
437 internal_name[(acpi_native_uint) (i+1)] = (char) num_segments;
438 result = &internal_name[(acpi_native_uint) (i+2)];
439 }
440 }
441
442 /* Build the name (minus path separators) */
443
444 for (; num_segments; num_segments--) {
445 for (i = 0; i < ACPI_NAME_SIZE; i++) {
446 if (acpi_ns_valid_path_separator (*external_name) ||
447 (*external_name == 0)) {
448 /* Pad the segment with underscore(s) if segment is short */
449
450 result[i] = '_';
451 }
452 else {
453 /* Convert the character to uppercase and save it */
454
455 result[i] = (char) ACPI_TOUPPER ((int) *external_name);
456 external_name++;
457 }
458 }
459
460 /* Now we must have a path separator, or the pathname is bad */
461
462 if (!acpi_ns_valid_path_separator (*external_name) &&
463 (*external_name != 0)) {
464 return_ACPI_STATUS (AE_BAD_PARAMETER);
465 }
466
467 /* Move on the next segment */
468
469 external_name++;
470 result += ACPI_NAME_SIZE;
471 }
472
473 /* Terminate the string */
474
475 *result = 0;
476
477 if (info->fully_qualified) {
478 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (abs) \"\\%s\"\n",
479 internal_name, internal_name));
480 }
481 else {
482 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
483 internal_name, internal_name));
484 }
485
486 return_ACPI_STATUS (AE_OK);
487}
488
489
490/*******************************************************************************
491 *
492 * FUNCTION: acpi_ns_internalize_name
493 *
494 * PARAMETERS: *external_name - External representation of name
495 * **Converted Name - Where to return the resulting
496 * internal represention of the name
497 *
498 * RETURN: Status
499 *
500 * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
501 * to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
502 *
503 *******************************************************************************/
504
505acpi_status
506acpi_ns_internalize_name (
507 char *external_name,
508 char **converted_name)
509{
510 char *internal_name;
511 struct acpi_namestring_info info;
512 acpi_status status;
513
514
515 ACPI_FUNCTION_TRACE ("ns_internalize_name");
516
517
518 if ((!external_name) ||
519 (*external_name == 0) ||
520 (!converted_name)) {
521 return_ACPI_STATUS (AE_BAD_PARAMETER);
522 }
523
524 /* Get the length of the new internal name */
525
526 info.external_name = external_name;
527 acpi_ns_get_internal_name_length (&info);
528
529 /* We need a segment to store the internal name */
530
531 internal_name = ACPI_MEM_CALLOCATE (info.length);
532 if (!internal_name) {
533 return_ACPI_STATUS (AE_NO_MEMORY);
534 }
535
536 /* Build the name */
537
538 info.internal_name = internal_name;
539 status = acpi_ns_build_internal_name (&info);
540 if (ACPI_FAILURE (status)) {
541 ACPI_MEM_FREE (internal_name);
542 return_ACPI_STATUS (status);
543 }
544
545 *converted_name = internal_name;
546 return_ACPI_STATUS (AE_OK);
547}
548
549
550/*******************************************************************************
551 *
552 * FUNCTION: acpi_ns_externalize_name
553 *
554 * PARAMETERS: *internal_name - Internal representation of name
555 * **converted_name - Where to return the resulting
556 * external representation of name
557 *
558 * RETURN: Status
559 *
560 * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
561 * to its external form (e.g. "\_PR_.CPU0")
562 *
563 ******************************************************************************/
564
565acpi_status
566acpi_ns_externalize_name (
567 u32 internal_name_length,
568 char *internal_name,
569 u32 *converted_name_length,
570 char **converted_name)
571{
572 acpi_native_uint names_index = 0;
573 acpi_native_uint num_segments = 0;
574 acpi_native_uint required_length;
575 acpi_native_uint prefix_length = 0;
576 acpi_native_uint i = 0;
577 acpi_native_uint j = 0;
578
579
580 ACPI_FUNCTION_TRACE ("ns_externalize_name");
581
582
583 if (!internal_name_length ||
584 !internal_name ||
585 !converted_name) {
586 return_ACPI_STATUS (AE_BAD_PARAMETER);
587 }
588
589 /*
590 * Check for a prefix (one '\' | one or more '^').
591 */
592 switch (internal_name[0]) {
593 case '\\':
594 prefix_length = 1;
595 break;
596
597 case '^':
598 for (i = 0; i < internal_name_length; i++) {
599 if (internal_name[i] == '^') {
600 prefix_length = i + 1;
601 }
602 else {
603 break;
604 }
605 }
606
607 if (i == internal_name_length) {
608 prefix_length = i;
609 }
610
611 break;
612
613 default:
614 break;
615 }
616
617 /*
618 * Check for object names. Note that there could be 0-255 of these
619 * 4-byte elements.
620 */
621 if (prefix_length < internal_name_length) {
622 switch (internal_name[prefix_length]) {
623 case AML_MULTI_NAME_PREFIX_OP:
624
625 /* <count> 4-byte names */
626
627 names_index = prefix_length + 2;
628 num_segments = (acpi_native_uint) (u8)
629 internal_name[(acpi_native_uint) (prefix_length + 1)];
630 break;
631
632 case AML_DUAL_NAME_PREFIX:
633
634 /* Two 4-byte names */
635
636 names_index = prefix_length + 1;
637 num_segments = 2;
638 break;
639
640 case 0:
641
642 /* null_name */
643
644 names_index = 0;
645 num_segments = 0;
646 break;
647
648 default:
649
650 /* one 4-byte name */
651
652 names_index = prefix_length;
653 num_segments = 1;
654 break;
655 }
656 }
657
658 /*
659 * Calculate the length of converted_name, which equals the length
660 * of the prefix, length of all object names, length of any required
661 * punctuation ('.') between object names, plus the NULL terminator.
662 */
663 required_length = prefix_length + (4 * num_segments) +
664 ((num_segments > 0) ? (num_segments - 1) : 0) + 1;
665
666 /*
667 * Check to see if we're still in bounds. If not, there's a problem
668 * with internal_name (invalid format).
669 */
670 if (required_length > internal_name_length) {
671 ACPI_REPORT_ERROR (("ns_externalize_name: Invalid internal name\n"));
672 return_ACPI_STATUS (AE_BAD_PATHNAME);
673 }
674
675 /*
676 * Build converted_name
677 */
678 *converted_name = ACPI_MEM_CALLOCATE (required_length);
679 if (!(*converted_name)) {
680 return_ACPI_STATUS (AE_NO_MEMORY);
681 }
682
683 j = 0;
684
685 for (i = 0; i < prefix_length; i++) {
686 (*converted_name)[j++] = internal_name[i];
687 }
688
689 if (num_segments > 0) {
690 for (i = 0; i < num_segments; i++) {
691 if (i > 0) {
692 (*converted_name)[j++] = '.';
693 }
694
695 (*converted_name)[j++] = internal_name[names_index++];
696 (*converted_name)[j++] = internal_name[names_index++];
697 (*converted_name)[j++] = internal_name[names_index++];
698 (*converted_name)[j++] = internal_name[names_index++];
699 }
700 }
701
702 if (converted_name_length) {
703 *converted_name_length = (u32) required_length;
704 }
705
706 return_ACPI_STATUS (AE_OK);
707}
708
709
710/*******************************************************************************
711 *
712 * FUNCTION: acpi_ns_map_handle_to_node
713 *
714 * PARAMETERS: Handle - Handle to be converted to an Node
715 *
716 * RETURN: A Name table entry pointer
717 *
718 * DESCRIPTION: Convert a namespace handle to a real Node
719 *
720 * Note: Real integer handles allow for more verification
721 * and keep all pointers within this subsystem.
722 *
723 ******************************************************************************/
724
725struct acpi_namespace_node *
726acpi_ns_map_handle_to_node (
727 acpi_handle handle)
728{
729
730 ACPI_FUNCTION_ENTRY ();
731
732
733 /*
734 * Simple implementation.
735 */
736 if (!handle) {
737 return (NULL);
738 }
739
740 if (handle == ACPI_ROOT_OBJECT) {
741 return (acpi_gbl_root_node);
742 }
743
744 /* We can at least attempt to verify the handle */
745
746 if (ACPI_GET_DESCRIPTOR_TYPE (handle) != ACPI_DESC_TYPE_NAMED) {
747 return (NULL);
748 }
749
750 return ((struct acpi_namespace_node *) handle);
751}
752
753
754/*******************************************************************************
755 *
756 * FUNCTION: acpi_ns_convert_entry_to_handle
757 *
758 * PARAMETERS: Node - Node to be converted to a Handle
759 *
760 * RETURN: A user handle
761 *
762 * DESCRIPTION: Convert a real Node to a namespace handle
763 *
764 ******************************************************************************/
765
766acpi_handle
767acpi_ns_convert_entry_to_handle (
768 struct acpi_namespace_node *node)
769{
770
771
772 /*
773 * Simple implementation for now;
774 */
775 return ((acpi_handle) node);
776
777
778/* ---------------------------------------------------
779
780 if (!Node)
781 {
782 return (NULL);
783 }
784
785 if (Node == acpi_gbl_root_node)
786 {
787 return (ACPI_ROOT_OBJECT);
788 }
789
790
791 return ((acpi_handle) Node);
792------------------------------------------------------*/
793}
794
795
796/*******************************************************************************
797 *
798 * FUNCTION: acpi_ns_terminate
799 *
800 * PARAMETERS: none
801 *
802 * RETURN: none
803 *
804 * DESCRIPTION: free memory allocated for table storage.
805 *
806 ******************************************************************************/
807
808void
809acpi_ns_terminate (void)
810{
811 union acpi_operand_object *obj_desc;
812
813
814 ACPI_FUNCTION_TRACE ("ns_terminate");
815
816
817 /*
818 * 1) Free the entire namespace -- all nodes and objects
819 *
820 * Delete all object descriptors attached to namepsace nodes
821 */
822 acpi_ns_delete_namespace_subtree (acpi_gbl_root_node);
823
824 /* Detach any objects attached to the root */
825
826 obj_desc = acpi_ns_get_attached_object (acpi_gbl_root_node);
827 if (obj_desc) {
828 acpi_ns_detach_object (acpi_gbl_root_node);
829 }
830
831 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freed\n"));
832
833 /*
834 * 2) Now we can delete the ACPI tables
835 */
836 acpi_tb_delete_all_tables ();
837 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "ACPI Tables freed\n"));
838
839 return_VOID;
840}
841
842
843/*******************************************************************************
844 *
845 * FUNCTION: acpi_ns_opens_scope
846 *
847 * PARAMETERS: Type - A valid namespace type
848 *
849 * RETURN: NEWSCOPE if the passed type "opens a name scope" according
850 * to the ACPI specification, else 0
851 *
852 ******************************************************************************/
853
854u32
855acpi_ns_opens_scope (
856 acpi_object_type type)
857{
858 ACPI_FUNCTION_TRACE_STR ("ns_opens_scope", acpi_ut_get_type_name (type));
859
860
861 if (!acpi_ut_valid_object_type (type)) {
862 /* type code out of range */
863
864 ACPI_REPORT_WARNING (("ns_opens_scope: Invalid Object Type %X\n", type));
865 return_VALUE (ACPI_NS_NORMAL);
866 }
867
868 return_VALUE (((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
869}
870
871
872/*******************************************************************************
873 *
874 * FUNCTION: acpi_ns_get_node_by_path
875 *
876 * PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
877 * \ (backslash) and ^ (carat) prefixes, and the
878 * . (period) to separate segments are supported.
879 * start_node - Root of subtree to be searched, or NS_ALL for the
880 * root of the name space. If Name is fully
881 * qualified (first s8 is '\'), the passed value
882 * of Scope will not be accessed.
883 * Flags - Used to indicate whether to perform upsearch or
884 * not.
885 * return_node - Where the Node is returned
886 *
887 * DESCRIPTION: Look up a name relative to a given scope and return the
888 * corresponding Node. NOTE: Scope can be null.
889 *
890 * MUTEX: Locks namespace
891 *
892 ******************************************************************************/
893
894acpi_status
895acpi_ns_get_node_by_path (
896 char *pathname,
897 struct acpi_namespace_node *start_node,
898 u32 flags,
899 struct acpi_namespace_node **return_node)
900{
901 union acpi_generic_state scope_info;
902 acpi_status status;
903 char *internal_path = NULL;
904
905
906 ACPI_FUNCTION_TRACE_PTR ("ns_get_node_by_path", pathname);
907
908
909 if (pathname) {
910 /* Convert path to internal representation */
911
912 status = acpi_ns_internalize_name (pathname, &internal_path);
913 if (ACPI_FAILURE (status)) {
914 return_ACPI_STATUS (status);
915 }
916 }
917
918 /* Must lock namespace during lookup */
919
920 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
921 if (ACPI_FAILURE (status)) {
922 goto cleanup;
923 }
924
925 /* Setup lookup scope (search starting point) */
926
927 scope_info.scope.node = start_node;
928
929 /* Lookup the name in the namespace */
930
931 status = acpi_ns_lookup (&scope_info, internal_path,
932 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
933 (flags | ACPI_NS_DONT_OPEN_SCOPE),
934 NULL, return_node);
935 if (ACPI_FAILURE (status)) {
936 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s, %s\n",
937 internal_path, acpi_format_exception (status)));
938 }
939
940 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
941
942cleanup:
943 /* Cleanup */
944 if (internal_path) {
945 ACPI_MEM_FREE (internal_path);
946 }
947 return_ACPI_STATUS (status);
948}
949
950
951/*******************************************************************************
952 *
953 * FUNCTION: acpi_ns_find_parent_name
954 *
955 * PARAMETERS: *child_node - Named Obj whose name is to be found
956 *
957 * RETURN: The ACPI name
958 *
959 * DESCRIPTION: Search for the given obj in its parent scope and return the
960 * name segment, or "????" if the parent name can't be found
961 * (which "should not happen").
962 *
963 ******************************************************************************/
964#ifdef ACPI_FUTURE_USAGE
965acpi_name
966acpi_ns_find_parent_name (
967 struct acpi_namespace_node *child_node)
968{
969 struct acpi_namespace_node *parent_node;
970
971
972 ACPI_FUNCTION_TRACE ("ns_find_parent_name");
973
974
975 if (child_node) {
976 /* Valid entry. Get the parent Node */
977
978 parent_node = acpi_ns_get_parent_node (child_node);
979 if (parent_node) {
980 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
981 "Parent of %p [%4.4s] is %p [%4.4s]\n",
982 child_node, acpi_ut_get_node_name (child_node),
983 parent_node, acpi_ut_get_node_name (parent_node)));
984
985 if (parent_node->name.integer) {
986 return_VALUE ((acpi_name) parent_node->name.integer);
987 }
988 }
989
990 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
991 "Unable to find parent of %p (%4.4s)\n",
992 child_node, acpi_ut_get_node_name (child_node)));
993 }
994
995 return_VALUE (ACPI_UNKNOWN_NAME);
996}
997#endif
998
999
1000/*******************************************************************************
1001 *
1002 * FUNCTION: acpi_ns_get_parent_node
1003 *
1004 * PARAMETERS: Node - Current table entry
1005 *
1006 * RETURN: Parent entry of the given entry
1007 *
1008 * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
1009 *
1010 ******************************************************************************/
1011
1012
1013struct acpi_namespace_node *
1014acpi_ns_get_parent_node (
1015 struct acpi_namespace_node *node)
1016{
1017 ACPI_FUNCTION_ENTRY ();
1018
1019
1020 if (!node) {
1021 return (NULL);
1022 }
1023
1024 /*
1025 * Walk to the end of this peer list. The last entry is marked with a flag
1026 * and the peer pointer is really a pointer back to the parent. This saves
1027 * putting a parent back pointer in each and every named object!
1028 */
1029 while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
1030 node = node->peer;
1031 }
1032
1033
1034 return (node->peer);
1035}
1036
1037
1038/*******************************************************************************
1039 *
1040 * FUNCTION: acpi_ns_get_next_valid_node
1041 *
1042 * PARAMETERS: Node - Current table entry
1043 *
1044 * RETURN: Next valid Node in the linked node list. NULL if no more valid
1045 * nodes.
1046 *
1047 * DESCRIPTION: Find the next valid node within a name table.
1048 * Useful for implementing NULL-end-of-list loops.
1049 *
1050 ******************************************************************************/
1051
1052
1053struct acpi_namespace_node *
1054acpi_ns_get_next_valid_node (
1055 struct acpi_namespace_node *node)
1056{
1057
1058 /* If we are at the end of this peer list, return NULL */
1059
1060 if (node->flags & ANOBJ_END_OF_PEER_LIST) {
1061 return NULL;
1062 }
1063
1064 /* Otherwise just return the next peer */
1065
1066 return (node->peer);
1067}
1068
1069
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-18 02:38:43 -0500