1 /******************************************************************************
3 * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
4 * parents and siblings and Scope manipulation
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2004, R. Byron Moore
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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.
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.
46 #include <acpi/acpi.h>
47 #include <acpi/acnamesp.h>
48 #include <acpi/amlcode.h>
49 #include <acpi/actables.h>
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME ("nsutils")
55 /*******************************************************************************
57 * FUNCTION: acpi_ns_report_error
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
66 * DESCRIPTION: Print warning message with full pathname
68 ******************************************************************************/
71 acpi_ns_report_error (
76 acpi_status lookup_status
)
82 acpi_os_printf ("%8s-%04d: *** Error: Looking up ",
83 module_name
, line_number
);
85 if (lookup_status
== AE_BAD_CHARACTER
) {
86 /* There is a non-ascii character in the name */
88 acpi_os_printf ("[0x%4.4X] (NON-ASCII)\n", *(ACPI_CAST_PTR (u32
, internal_name
)));
91 /* Convert path to external format */
93 status
= acpi_ns_externalize_name (ACPI_UINT32_MAX
, internal_name
, NULL
, &name
);
95 /* Print target name */
97 if (ACPI_SUCCESS (status
)) {
98 acpi_os_printf ("[%s]", name
);
101 acpi_os_printf ("[COULD NOT EXTERNALIZE NAME]");
105 ACPI_MEM_FREE (name
);
109 acpi_os_printf (" in namespace, %s\n",
110 acpi_format_exception (lookup_status
));
114 /*******************************************************************************
116 * FUNCTION: acpi_ns_report_method_error
118 * PARAMETERS: module_name - Caller's module name (for error output)
119 * line_number - Caller's line number (for error output)
120 * component_id - Caller's component ID (for error output)
121 * Message - Error message to use on failure
125 * DESCRIPTION: Print warning message with full pathname
127 ******************************************************************************/
130 acpi_ns_report_method_error (
135 struct acpi_namespace_node
*prefix_node
,
137 acpi_status method_status
)
140 struct acpi_namespace_node
*node
= prefix_node
;
144 status
= acpi_ns_get_node_by_path (path
, prefix_node
, ACPI_NS_NO_UPSEARCH
, &node
);
145 if (ACPI_FAILURE (status
)) {
146 acpi_os_printf ("report_method_error: Could not get node\n");
151 acpi_os_printf ("%8s-%04d: *** Error: ", module_name
, line_number
);
152 acpi_ns_print_node_pathname (node
, message
);
153 acpi_os_printf (", %s\n", acpi_format_exception (method_status
));
157 /*******************************************************************************
159 * FUNCTION: acpi_ns_print_node_pathname
161 * PARAMETERS: Node - Object
162 * Msg - Prefix message
164 * DESCRIPTION: Print an object's full namespace pathname
165 * Manages allocation/freeing of a pathname buffer
167 ******************************************************************************/
170 acpi_ns_print_node_pathname (
171 struct acpi_namespace_node
*node
,
174 struct acpi_buffer buffer
;
179 acpi_os_printf ("[NULL NAME]");
183 /* Convert handle to a full pathname and print it (with supplied message) */
185 buffer
.length
= ACPI_ALLOCATE_LOCAL_BUFFER
;
187 status
= acpi_ns_handle_to_pathname (node
, &buffer
);
188 if (ACPI_SUCCESS (status
)) {
190 acpi_os_printf ("%s ", msg
);
193 acpi_os_printf ("[%s] (Node %p)", (char *) buffer
.pointer
, node
);
194 ACPI_MEM_FREE (buffer
.pointer
);
199 /*******************************************************************************
201 * FUNCTION: acpi_ns_valid_root_prefix
203 * PARAMETERS: Prefix - Character to be checked
205 * RETURN: TRUE if a valid prefix
207 * DESCRIPTION: Check if a character is a valid ACPI Root prefix
209 ******************************************************************************/
212 acpi_ns_valid_root_prefix (
216 return ((u8
) (prefix
== '\\'));
220 /*******************************************************************************
222 * FUNCTION: acpi_ns_valid_path_separator
224 * PARAMETERS: Sep - Character to be checked
226 * RETURN: TRUE if a valid path separator
228 * DESCRIPTION: Check if a character is a valid ACPI path separator
230 ******************************************************************************/
233 acpi_ns_valid_path_separator (
237 return ((u8
) (sep
== '.'));
241 /*******************************************************************************
243 * FUNCTION: acpi_ns_get_type
245 * PARAMETERS: Handle - Parent Node to be examined
247 * RETURN: Type field from Node whose handle is passed
249 ******************************************************************************/
253 struct acpi_namespace_node
*node
)
255 ACPI_FUNCTION_TRACE ("ns_get_type");
259 ACPI_REPORT_WARNING (("ns_get_type: Null Node input pointer\n"));
260 return_VALUE (ACPI_TYPE_ANY
);
263 return_VALUE ((acpi_object_type
) node
->type
);
267 /*******************************************************************************
269 * FUNCTION: acpi_ns_local
271 * PARAMETERS: Type - A namespace object type
273 * RETURN: LOCAL if names must be found locally in objects of the
274 * passed type, 0 if enclosing scopes should be searched
276 ******************************************************************************/
280 acpi_object_type type
)
282 ACPI_FUNCTION_TRACE ("ns_local");
285 if (!acpi_ut_valid_object_type (type
)) {
286 /* Type code out of range */
288 ACPI_REPORT_WARNING (("ns_local: Invalid Object Type\n"));
289 return_VALUE (ACPI_NS_NORMAL
);
292 return_VALUE ((u32
) acpi_gbl_ns_properties
[type
] & ACPI_NS_LOCAL
);
296 /*******************************************************************************
298 * FUNCTION: acpi_ns_get_internal_name_length
300 * PARAMETERS: Info - Info struct initialized with the
301 * external name pointer.
305 * DESCRIPTION: Calculate the length of the internal (AML) namestring
306 * corresponding to the external (ASL) namestring.
308 ******************************************************************************/
311 acpi_ns_get_internal_name_length (
312 struct acpi_namestring_info
*info
)
314 char *next_external_char
;
318 ACPI_FUNCTION_ENTRY ();
321 next_external_char
= info
->external_name
;
322 info
->num_carats
= 0;
323 info
->num_segments
= 0;
324 info
->fully_qualified
= FALSE
;
327 * For the internal name, the required length is 4 bytes
328 * per segment, plus 1 each for root_prefix, multi_name_prefix_op,
329 * segment count, trailing null (which is not really needed,
330 * but no there's harm in putting it there)
332 * strlen() + 1 covers the first name_seg, which has no
335 if (acpi_ns_valid_root_prefix (next_external_char
[0])) {
336 info
->fully_qualified
= TRUE
;
337 next_external_char
++;
341 * Handle Carat prefixes
343 while (*next_external_char
== '^') {
345 next_external_char
++;
350 * Determine the number of ACPI name "segments" by counting
351 * the number of path separators within the string. Start
352 * with one segment since the segment count is (# separators)
353 * + 1, and zero separators is ok.
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
++;
364 info
->length
= (ACPI_NAME_SIZE
* info
->num_segments
) +
365 4 + info
->num_carats
;
367 info
->next_external_char
= next_external_char
;
371 /*******************************************************************************
373 * FUNCTION: acpi_ns_build_internal_name
375 * PARAMETERS: Info - Info struct fully initialized
379 * DESCRIPTION: Construct the internal (AML) namestring
380 * corresponding to the external (ASL) namestring.
382 ******************************************************************************/
385 acpi_ns_build_internal_name (
386 struct acpi_namestring_info
*info
)
388 u32 num_segments
= info
->num_segments
;
389 char *internal_name
= info
->internal_name
;
390 char *external_name
= info
->next_external_char
;
395 ACPI_FUNCTION_TRACE ("ns_build_internal_name");
398 /* Setup the correct prefixes, counts, and pointers */
400 if (info
->fully_qualified
) {
401 internal_name
[0] = '\\';
403 if (num_segments
<= 1) {
404 result
= &internal_name
[1];
406 else if (num_segments
== 2) {
407 internal_name
[1] = AML_DUAL_NAME_PREFIX
;
408 result
= &internal_name
[2];
411 internal_name
[1] = AML_MULTI_NAME_PREFIX_OP
;
412 internal_name
[2] = (char) num_segments
;
413 result
= &internal_name
[3];
418 * Not fully qualified.
419 * Handle Carats first, then append the name segments
422 if (info
->num_carats
) {
423 for (i
= 0; i
< info
->num_carats
; i
++) {
424 internal_name
[i
] = '^';
428 if (num_segments
<= 1) {
429 result
= &internal_name
[i
];
431 else if (num_segments
== 2) {
432 internal_name
[i
] = AML_DUAL_NAME_PREFIX
;
433 result
= &internal_name
[(acpi_native_uint
) (i
+1)];
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)];
442 /* Build the name (minus path separators) */
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 */
453 /* Convert the character to uppercase and save it */
455 result
[i
] = (char) ACPI_TOUPPER ((int) *external_name
);
460 /* Now we must have a path separator, or the pathname is bad */
462 if (!acpi_ns_valid_path_separator (*external_name
) &&
463 (*external_name
!= 0)) {
464 return_ACPI_STATUS (AE_BAD_PARAMETER
);
467 /* Move on the next segment */
470 result
+= ACPI_NAME_SIZE
;
473 /* Terminate the string */
477 if (info
->fully_qualified
) {
478 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "Returning [%p] (abs) \"\\%s\"\n",
479 internal_name
, internal_name
));
482 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "Returning [%p] (rel) \"%s\"\n",
483 internal_name
, internal_name
));
486 return_ACPI_STATUS (AE_OK
);
490 /*******************************************************************************
492 * FUNCTION: acpi_ns_internalize_name
494 * PARAMETERS: *external_name - External representation of name
495 * **Converted Name - Where to return the resulting
496 * internal represention of the name
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)
503 *******************************************************************************/
506 acpi_ns_internalize_name (
508 char **converted_name
)
511 struct acpi_namestring_info info
;
515 ACPI_FUNCTION_TRACE ("ns_internalize_name");
518 if ((!external_name
) ||
519 (*external_name
== 0) ||
521 return_ACPI_STATUS (AE_BAD_PARAMETER
);
524 /* Get the length of the new internal name */
526 info
.external_name
= external_name
;
527 acpi_ns_get_internal_name_length (&info
);
529 /* We need a segment to store the internal name */
531 internal_name
= ACPI_MEM_CALLOCATE (info
.length
);
532 if (!internal_name
) {
533 return_ACPI_STATUS (AE_NO_MEMORY
);
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
);
545 *converted_name
= internal_name
;
546 return_ACPI_STATUS (AE_OK
);
550 /*******************************************************************************
552 * FUNCTION: acpi_ns_externalize_name
554 * PARAMETERS: *internal_name - Internal representation of name
555 * **converted_name - Where to return the resulting
556 * external representation of name
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")
563 ******************************************************************************/
566 acpi_ns_externalize_name (
567 u32 internal_name_length
,
569 u32
*converted_name_length
,
570 char **converted_name
)
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;
580 ACPI_FUNCTION_TRACE ("ns_externalize_name");
583 if (!internal_name_length
||
586 return_ACPI_STATUS (AE_BAD_PARAMETER
);
590 * Check for a prefix (one '\' | one or more '^').
592 switch (internal_name
[0]) {
598 for (i
= 0; i
< internal_name_length
; i
++) {
599 if (internal_name
[i
] == '^') {
600 prefix_length
= i
+ 1;
607 if (i
== internal_name_length
) {
618 * Check for object names. Note that there could be 0-255 of these
621 if (prefix_length
< internal_name_length
) {
622 switch (internal_name
[prefix_length
]) {
623 case AML_MULTI_NAME_PREFIX_OP
:
625 /* <count> 4-byte names */
627 names_index
= prefix_length
+ 2;
628 num_segments
= (acpi_native_uint
) (u8
) internal_name
[(acpi_native_uint
) (prefix_length
+ 1)];
631 case AML_DUAL_NAME_PREFIX
:
633 /* Two 4-byte names */
635 names_index
= prefix_length
+ 1;
649 /* one 4-byte name */
651 names_index
= prefix_length
;
658 * Calculate the length of converted_name, which equals the length
659 * of the prefix, length of all object names, length of any required
660 * punctuation ('.') between object names, plus the NULL terminator.
662 required_length
= prefix_length
+ (4 * num_segments
) +
663 ((num_segments
> 0) ? (num_segments
- 1) : 0) + 1;
666 * Check to see if we're still in bounds. If not, there's a problem
667 * with internal_name (invalid format).
669 if (required_length
> internal_name_length
) {
670 ACPI_REPORT_ERROR (("ns_externalize_name: Invalid internal name\n"));
671 return_ACPI_STATUS (AE_BAD_PATHNAME
);
675 * Build converted_name...
677 *converted_name
= ACPI_MEM_CALLOCATE (required_length
);
678 if (!(*converted_name
)) {
679 return_ACPI_STATUS (AE_NO_MEMORY
);
684 for (i
= 0; i
< prefix_length
; i
++) {
685 (*converted_name
)[j
++] = internal_name
[i
];
688 if (num_segments
> 0) {
689 for (i
= 0; i
< num_segments
; i
++) {
691 (*converted_name
)[j
++] = '.';
694 (*converted_name
)[j
++] = internal_name
[names_index
++];
695 (*converted_name
)[j
++] = internal_name
[names_index
++];
696 (*converted_name
)[j
++] = internal_name
[names_index
++];
697 (*converted_name
)[j
++] = internal_name
[names_index
++];
701 if (converted_name_length
) {
702 *converted_name_length
= (u32
) required_length
;
705 return_ACPI_STATUS (AE_OK
);
709 /*******************************************************************************
711 * FUNCTION: acpi_ns_map_handle_to_node
713 * PARAMETERS: Handle - Handle to be converted to an Node
715 * RETURN: A Name table entry pointer
717 * DESCRIPTION: Convert a namespace handle to a real Node
719 * Note: Real integer handles allow for more verification
720 * and keep all pointers within this subsystem.
722 ******************************************************************************/
724 struct acpi_namespace_node
*
725 acpi_ns_map_handle_to_node (
729 ACPI_FUNCTION_ENTRY ();
733 * Simple implementation.
739 if (handle
== ACPI_ROOT_OBJECT
) {
740 return (acpi_gbl_root_node
);
743 /* We can at least attempt to verify the handle */
745 if (ACPI_GET_DESCRIPTOR_TYPE (handle
) != ACPI_DESC_TYPE_NAMED
) {
749 return ((struct acpi_namespace_node
*) handle
);
753 /*******************************************************************************
755 * FUNCTION: acpi_ns_convert_entry_to_handle
757 * PARAMETERS: Node - Node to be converted to a Handle
759 * RETURN: An USER acpi_handle
761 * DESCRIPTION: Convert a real Node to a namespace handle
763 ******************************************************************************/
766 acpi_ns_convert_entry_to_handle (
767 struct acpi_namespace_node
*node
)
772 * Simple implementation for now;
774 return ((acpi_handle
) node
);
777 /* ---------------------------------------------------
784 if (Node == acpi_gbl_root_node)
786 return (ACPI_ROOT_OBJECT);
790 return ((acpi_handle) Node);
791 ------------------------------------------------------*/
795 /*******************************************************************************
797 * FUNCTION: acpi_ns_terminate
803 * DESCRIPTION: free memory allocated for table storage.
805 ******************************************************************************/
808 acpi_ns_terminate (void)
810 union acpi_operand_object
*obj_desc
;
813 ACPI_FUNCTION_TRACE ("ns_terminate");
817 * 1) Free the entire namespace -- all nodes and objects
819 * Delete all object descriptors attached to namepsace nodes
821 acpi_ns_delete_namespace_subtree (acpi_gbl_root_node
);
823 /* Detach any objects attached to the root */
825 obj_desc
= acpi_ns_get_attached_object (acpi_gbl_root_node
);
827 acpi_ns_detach_object (acpi_gbl_root_node
);
830 ACPI_DEBUG_PRINT ((ACPI_DB_INFO
, "Namespace freed\n"));
833 * 2) Now we can delete the ACPI tables
835 acpi_tb_delete_all_tables ();
836 ACPI_DEBUG_PRINT ((ACPI_DB_INFO
, "ACPI Tables freed\n"));
842 /*******************************************************************************
844 * FUNCTION: acpi_ns_opens_scope
846 * PARAMETERS: Type - A valid namespace type
848 * RETURN: NEWSCOPE if the passed type "opens a name scope" according
849 * to the ACPI specification, else 0
851 ******************************************************************************/
854 acpi_ns_opens_scope (
855 acpi_object_type type
)
857 ACPI_FUNCTION_TRACE_STR ("ns_opens_scope", acpi_ut_get_type_name (type
));
860 if (!acpi_ut_valid_object_type (type
)) {
861 /* type code out of range */
863 ACPI_REPORT_WARNING (("ns_opens_scope: Invalid Object Type %X\n", type
));
864 return_VALUE (ACPI_NS_NORMAL
);
867 return_VALUE (((u32
) acpi_gbl_ns_properties
[type
]) & ACPI_NS_NEWSCOPE
);
871 /*******************************************************************************
873 * FUNCTION: acpi_ns_get_node_by_path
875 * PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
876 * \ (backslash) and ^ (carat) prefixes, and the
877 * . (period) to separate segments are supported.
878 * start_node - Root of subtree to be searched, or NS_ALL for the
879 * root of the name space. If Name is fully
880 * qualified (first s8 is '\'), the passed value
881 * of Scope will not be accessed.
882 * Flags - Used to indicate whether to perform upsearch or
884 * return_node - Where the Node is returned
886 * DESCRIPTION: Look up a name relative to a given scope and return the
887 * corresponding Node. NOTE: Scope can be null.
889 * MUTEX: Locks namespace
891 ******************************************************************************/
894 acpi_ns_get_node_by_path (
896 struct acpi_namespace_node
*start_node
,
898 struct acpi_namespace_node
**return_node
)
900 union acpi_generic_state scope_info
;
902 char *internal_path
= NULL
;
905 ACPI_FUNCTION_TRACE_PTR ("ns_get_node_by_path", pathname
);
909 /* Convert path to internal representation */
911 status
= acpi_ns_internalize_name (pathname
, &internal_path
);
912 if (ACPI_FAILURE (status
)) {
913 return_ACPI_STATUS (status
);
917 /* Must lock namespace during lookup */
919 status
= acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE
);
920 if (ACPI_FAILURE (status
)) {
924 /* Setup lookup scope (search starting point) */
926 scope_info
.scope
.node
= start_node
;
928 /* Lookup the name in the namespace */
930 status
= acpi_ns_lookup (&scope_info
, internal_path
,
931 ACPI_TYPE_ANY
, ACPI_IMODE_EXECUTE
,
932 (flags
| ACPI_NS_DONT_OPEN_SCOPE
),
934 if (ACPI_FAILURE (status
)) {
935 ACPI_DEBUG_PRINT ((ACPI_DB_INFO
, "%s, %s\n",
936 internal_path
, acpi_format_exception (status
)));
939 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE
);
944 ACPI_MEM_FREE (internal_path
);
946 return_ACPI_STATUS (status
);
950 /*******************************************************************************
952 * FUNCTION: acpi_ns_find_parent_name
954 * PARAMETERS: *child_node - Named Obj whose name is to be found
956 * RETURN: The ACPI name
958 * DESCRIPTION: Search for the given obj in its parent scope and return the
959 * name segment, or "????" if the parent name can't be found
960 * (which "should not happen").
962 ******************************************************************************/
965 acpi_ns_find_parent_name (
966 struct acpi_namespace_node
*child_node
)
968 struct acpi_namespace_node
*parent_node
;
971 ACPI_FUNCTION_TRACE ("ns_find_parent_name");
975 /* Valid entry. Get the parent Node */
977 parent_node
= acpi_ns_get_parent_node (child_node
);
979 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "Parent of %p [%4.4s] is %p [%4.4s]\n",
980 child_node
, acpi_ut_get_node_name (child_node
),
981 parent_node
, acpi_ut_get_node_name (parent_node
)));
983 if (parent_node
->name
.integer
) {
984 return_VALUE ((acpi_name
) parent_node
->name
.integer
);
988 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "unable to find parent of %p (%4.4s)\n",
989 child_node
, acpi_ut_get_node_name (child_node
)));
992 return_VALUE (ACPI_UNKNOWN_NAME
);
996 /*******************************************************************************
998 * FUNCTION: acpi_ns_get_parent_node
1000 * PARAMETERS: Node - Current table entry
1002 * RETURN: Parent entry of the given entry
1004 * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
1006 ******************************************************************************/
1009 struct acpi_namespace_node
*
1010 acpi_ns_get_parent_node (
1011 struct acpi_namespace_node
*node
)
1013 ACPI_FUNCTION_ENTRY ();
1021 * Walk to the end of this peer list.
1022 * The last entry is marked with a flag and the peer
1023 * pointer is really a pointer back to the parent.
1024 * This saves putting a parent back pointer in each and
1025 * every named object!
1027 while (!(node
->flags
& ANOBJ_END_OF_PEER_LIST
)) {
1032 return (node
->peer
);
1036 /*******************************************************************************
1038 * FUNCTION: acpi_ns_get_next_valid_node
1040 * PARAMETERS: Node - Current table entry
1042 * RETURN: Next valid Node in the linked node list. NULL if no more valid
1045 * DESCRIPTION: Find the next valid node within a name table.
1046 * Useful for implementing NULL-end-of-list loops.
1048 ******************************************************************************/
1051 struct acpi_namespace_node
*
1052 acpi_ns_get_next_valid_node (
1053 struct acpi_namespace_node
*node
)
1056 /* If we are at the end of this peer list, return NULL */
1058 if (node
->flags
& ANOBJ_END_OF_PEER_LIST
) {
1062 /* Otherwise just return the next peer */
1064 return (node
->peer
);