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linux-stable-rt/drivers/acpi/namespace/nsutils.c

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/******************************************************************************
*
* Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
* parents and siblings and Scope manipulation
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include <acpi/acnamesp.h>
#include <acpi/amlcode.h>
#include <acpi/actables.h>
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME ("nsutils")
/*******************************************************************************
*
* FUNCTION: acpi_ns_report_error
*
* PARAMETERS: module_name - Caller's module name (for error output)
* line_number - Caller's line number (for error output)
* component_id - Caller's component ID (for error output)
* Message - Error message to use on failure
*
* RETURN: None
*
* DESCRIPTION: Print warning message with full pathname
*
******************************************************************************/
void
acpi_ns_report_error (
char *module_name,
u32 line_number,
u32 component_id,
char *internal_name,
acpi_status lookup_status)
{
acpi_status status;
char *name = NULL;
acpi_os_printf ("%8s-%04d: *** Error: Looking up ",
module_name, line_number);
if (lookup_status == AE_BAD_CHARACTER) {
/* There is a non-ascii character in the name */
acpi_os_printf ("[0x%4.4X] (NON-ASCII)\n",
*(ACPI_CAST_PTR (u32, internal_name)));
}
else {
/* Convert path to external format */
status = acpi_ns_externalize_name (ACPI_UINT32_MAX,
internal_name, NULL, &name);
/* Print target name */
if (ACPI_SUCCESS (status)) {
acpi_os_printf ("[%s]", name);
}
else {
acpi_os_printf ("[COULD NOT EXTERNALIZE NAME]");
}
if (name) {
ACPI_MEM_FREE (name);
}
}
acpi_os_printf (" in namespace, %s\n",
acpi_format_exception (lookup_status));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_report_method_error
*
* PARAMETERS: module_name - Caller's module name (for error output)
* line_number - Caller's line number (for error output)
* component_id - Caller's component ID (for error output)
* Message - Error message to use on failure
*
* RETURN: None
*
* DESCRIPTION: Print warning message with full pathname
*
******************************************************************************/
void
acpi_ns_report_method_error (
char *module_name,
u32 line_number,
u32 component_id,
char *message,
struct acpi_namespace_node *prefix_node,
char *path,
acpi_status method_status)
{
acpi_status status;
struct acpi_namespace_node *node = prefix_node;
if (path) {
status = acpi_ns_get_node_by_path (path, prefix_node,
ACPI_NS_NO_UPSEARCH, &node);
if (ACPI_FAILURE (status)) {
acpi_os_printf ("report_method_error: Could not get node\n");
return;
}
}
acpi_os_printf ("%8s-%04d: *** Error: ", module_name, line_number);
acpi_ns_print_node_pathname (node, message);
acpi_os_printf (", %s\n", acpi_format_exception (method_status));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_print_node_pathname
*
* PARAMETERS: Node - Object
* Msg - Prefix message
*
* DESCRIPTION: Print an object's full namespace pathname
* Manages allocation/freeing of a pathname buffer
*
******************************************************************************/
void
acpi_ns_print_node_pathname (
struct acpi_namespace_node *node,
char *msg)
{
struct acpi_buffer buffer;
acpi_status status;
if (!node) {
acpi_os_printf ("[NULL NAME]");
return;
}
/* Convert handle to full pathname and print it (with supplied message) */
buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
status = acpi_ns_handle_to_pathname (node, &buffer);
if (ACPI_SUCCESS (status)) {
if (msg) {
acpi_os_printf ("%s ", msg);
}
acpi_os_printf ("[%s] (Node %p)", (char *) buffer.pointer, node);
ACPI_MEM_FREE (buffer.pointer);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_valid_root_prefix
*
* PARAMETERS: Prefix - Character to be checked
*
* RETURN: TRUE if a valid prefix
*
* DESCRIPTION: Check if a character is a valid ACPI Root prefix
*
******************************************************************************/
u8
acpi_ns_valid_root_prefix (
char prefix)
{
return ((u8) (prefix == '\\'));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_valid_path_separator
*
* PARAMETERS: Sep - Character to be checked
*
* RETURN: TRUE if a valid path separator
*
* DESCRIPTION: Check if a character is a valid ACPI path separator
*
******************************************************************************/
u8
acpi_ns_valid_path_separator (
char sep)
{
return ((u8) (sep == '.'));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_type
*
* PARAMETERS: Handle - Parent Node to be examined
*
* RETURN: Type field from Node whose handle is passed
*
******************************************************************************/
acpi_object_type
acpi_ns_get_type (
struct acpi_namespace_node *node)
{
ACPI_FUNCTION_TRACE ("ns_get_type");
if (!node) {
ACPI_REPORT_WARNING (("ns_get_type: Null Node input pointer\n"));
return_VALUE (ACPI_TYPE_ANY);
}
return_VALUE ((acpi_object_type) node->type);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_local
*
* PARAMETERS: Type - A namespace object type
*
* RETURN: LOCAL if names must be found locally in objects of the
* passed type, 0 if enclosing scopes should be searched
*
******************************************************************************/
u32
acpi_ns_local (
acpi_object_type type)
{
ACPI_FUNCTION_TRACE ("ns_local");
if (!acpi_ut_valid_object_type (type)) {
/* Type code out of range */
ACPI_REPORT_WARNING (("ns_local: Invalid Object Type\n"));
return_VALUE (ACPI_NS_NORMAL);
}
return_VALUE ((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_internal_name_length
*
* PARAMETERS: Info - Info struct initialized with the
* external name pointer.
*
* RETURN: Status
*
* DESCRIPTION: Calculate the length of the internal (AML) namestring
* corresponding to the external (ASL) namestring.
*
******************************************************************************/
void
acpi_ns_get_internal_name_length (
struct acpi_namestring_info *info)
{
char *next_external_char;
u32 i;
ACPI_FUNCTION_ENTRY ();
next_external_char = info->external_name;
info->num_carats = 0;
info->num_segments = 0;
info->fully_qualified = FALSE;
/*
* For the internal name, the required length is 4 bytes per segment, plus
* 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
* (which is not really needed, but no there's harm in putting it there)
*
* strlen() + 1 covers the first name_seg, which has no path separator
*/
if (acpi_ns_valid_root_prefix (next_external_char[0])) {
info->fully_qualified = TRUE;
next_external_char++;
}
else {
/*
* Handle Carat prefixes
*/
while (*next_external_char == '^') {
info->num_carats++;
next_external_char++;
}
}
/*
* Determine the number of ACPI name "segments" by counting the number of
* path separators within the string. Start with one segment since the
* segment count is [(# separators) + 1], and zero separators is ok.
*/
if (*next_external_char) {
info->num_segments = 1;
for (i = 0; next_external_char[i]; i++) {
if (acpi_ns_valid_path_separator (next_external_char[i])) {
info->num_segments++;
}
}
}
info->length = (ACPI_NAME_SIZE * info->num_segments) +
4 + info->num_carats;
info->next_external_char = next_external_char;
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_build_internal_name
*
* PARAMETERS: Info - Info struct fully initialized
*
* RETURN: Status
*
* DESCRIPTION: Construct the internal (AML) namestring
* corresponding to the external (ASL) namestring.
*
******************************************************************************/
acpi_status
acpi_ns_build_internal_name (
struct acpi_namestring_info *info)
{
u32 num_segments = info->num_segments;
char *internal_name = info->internal_name;
char *external_name = info->next_external_char;
char *result = NULL;
acpi_native_uint i;
ACPI_FUNCTION_TRACE ("ns_build_internal_name");
/* Setup the correct prefixes, counts, and pointers */
if (info->fully_qualified) {
internal_name[0] = '\\';
if (num_segments <= 1) {
result = &internal_name[1];
}
else if (num_segments == 2) {
internal_name[1] = AML_DUAL_NAME_PREFIX;
result = &internal_name[2];
}
else {
internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
internal_name[2] = (char) num_segments;
result = &internal_name[3];
}
}
else {
/*
* Not fully qualified.
* Handle Carats first, then append the name segments
*/
i = 0;
if (info->num_carats) {
for (i = 0; i < info->num_carats; i++) {
internal_name[i] = '^';
}
}
if (num_segments <= 1) {
result = &internal_name[i];
}
else if (num_segments == 2) {
internal_name[i] = AML_DUAL_NAME_PREFIX;
result = &internal_name[(acpi_native_uint) (i+1)];
}
else {
internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
internal_name[(acpi_native_uint) (i+1)] = (char) num_segments;
result = &internal_name[(acpi_native_uint) (i+2)];
}
}
/* Build the name (minus path separators) */
for (; num_segments; num_segments--) {
for (i = 0; i < ACPI_NAME_SIZE; i++) {
if (acpi_ns_valid_path_separator (*external_name) ||
(*external_name == 0)) {
/* Pad the segment with underscore(s) if segment is short */
result[i] = '_';
}
else {
/* Convert the character to uppercase and save it */
result[i] = (char) ACPI_TOUPPER ((int) *external_name);
external_name++;
}
}
/* Now we must have a path separator, or the pathname is bad */
if (!acpi_ns_valid_path_separator (*external_name) &&
(*external_name != 0)) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Move on the next segment */
external_name++;
result += ACPI_NAME_SIZE;
}
/* Terminate the string */
*result = 0;
if (info->fully_qualified) {
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (abs) \"\\%s\"\n",
internal_name, internal_name));
}
else {
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
internal_name, internal_name));
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_internalize_name
*
* PARAMETERS: *external_name - External representation of name
* **Converted Name - Where to return the resulting
* internal represention of the name
*
* RETURN: Status
*
* DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
* to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
*
*******************************************************************************/
acpi_status
acpi_ns_internalize_name (
char *external_name,
char **converted_name)
{
char *internal_name;
struct acpi_namestring_info info;
acpi_status status;
ACPI_FUNCTION_TRACE ("ns_internalize_name");
if ((!external_name) ||
(*external_name == 0) ||
(!converted_name)) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Get the length of the new internal name */
info.external_name = external_name;
acpi_ns_get_internal_name_length (&info);
/* We need a segment to store the internal name */
internal_name = ACPI_MEM_CALLOCATE (info.length);
if (!internal_name) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Build the name */
info.internal_name = internal_name;
status = acpi_ns_build_internal_name (&info);
if (ACPI_FAILURE (status)) {
ACPI_MEM_FREE (internal_name);
return_ACPI_STATUS (status);
}
*converted_name = internal_name;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_externalize_name
*
* PARAMETERS: *internal_name - Internal representation of name
* **converted_name - Where to return the resulting
* external representation of name
*
* RETURN: Status
*
* DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
* to its external form (e.g. "\_PR_.CPU0")
*
******************************************************************************/
acpi_status
acpi_ns_externalize_name (
u32 internal_name_length,
char *internal_name,
u32 *converted_name_length,
char **converted_name)
{
acpi_native_uint names_index = 0;
acpi_native_uint num_segments = 0;
acpi_native_uint required_length;
acpi_native_uint prefix_length = 0;
acpi_native_uint i = 0;
acpi_native_uint j = 0;
ACPI_FUNCTION_TRACE ("ns_externalize_name");
if (!internal_name_length ||
!internal_name ||
!converted_name) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* Check for a prefix (one '\' | one or more '^').
*/
switch (internal_name[0]) {
case '\\':
prefix_length = 1;
break;
case '^':
for (i = 0; i < internal_name_length; i++) {
if (internal_name[i] == '^') {
prefix_length = i + 1;
}
else {
break;
}
}
if (i == internal_name_length) {
prefix_length = i;
}
break;
default:
break;
}
/*
* Check for object names. Note that there could be 0-255 of these
* 4-byte elements.
*/
if (prefix_length < internal_name_length) {
switch (internal_name[prefix_length]) {
case AML_MULTI_NAME_PREFIX_OP:
/* <count> 4-byte names */
names_index = prefix_length + 2;
num_segments = (acpi_native_uint) (u8)
internal_name[(acpi_native_uint) (prefix_length + 1)];
break;
case AML_DUAL_NAME_PREFIX:
/* Two 4-byte names */
names_index = prefix_length + 1;
num_segments = 2;
break;
case 0:
/* null_name */
names_index = 0;
num_segments = 0;
break;
default:
/* one 4-byte name */
names_index = prefix_length;
num_segments = 1;
break;
}
}
/*
* Calculate the length of converted_name, which equals the length
* of the prefix, length of all object names, length of any required
* punctuation ('.') between object names, plus the NULL terminator.
*/
required_length = prefix_length + (4 * num_segments) +
((num_segments > 0) ? (num_segments - 1) : 0) + 1;
/*
* Check to see if we're still in bounds. If not, there's a problem
* with internal_name (invalid format).
*/
if (required_length > internal_name_length) {
ACPI_REPORT_ERROR (("ns_externalize_name: Invalid internal name\n"));
return_ACPI_STATUS (AE_BAD_PATHNAME);
}
/*
* Build converted_name
*/
*converted_name = ACPI_MEM_CALLOCATE (required_length);
if (!(*converted_name)) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
j = 0;
for (i = 0; i < prefix_length; i++) {
(*converted_name)[j++] = internal_name[i];
}
if (num_segments > 0) {
for (i = 0; i < num_segments; i++) {
if (i > 0) {
(*converted_name)[j++] = '.';
}
(*converted_name)[j++] = internal_name[names_index++];
(*converted_name)[j++] = internal_name[names_index++];
(*converted_name)[j++] = internal_name[names_index++];
(*converted_name)[j++] = internal_name[names_index++];
}
}
if (converted_name_length) {
*converted_name_length = (u32) required_length;
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_map_handle_to_node
*
* PARAMETERS: Handle - Handle to be converted to an Node
*
* RETURN: A Name table entry pointer
*
* DESCRIPTION: Convert a namespace handle to a real Node
*
* Note: Real integer handles allow for more verification
* and keep all pointers within this subsystem.
*
******************************************************************************/
struct acpi_namespace_node *
acpi_ns_map_handle_to_node (
acpi_handle handle)
{
ACPI_FUNCTION_ENTRY ();
/*
* Simple implementation.
*/
if (!handle) {
return (NULL);
}
if (handle == ACPI_ROOT_OBJECT) {
return (acpi_gbl_root_node);
}
/* We can at least attempt to verify the handle */
if (ACPI_GET_DESCRIPTOR_TYPE (handle) != ACPI_DESC_TYPE_NAMED) {
return (NULL);
}
return ((struct acpi_namespace_node *) handle);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_convert_entry_to_handle
*
* PARAMETERS: Node - Node to be converted to a Handle
*
* RETURN: A user handle
*
* DESCRIPTION: Convert a real Node to a namespace handle
*
******************************************************************************/
acpi_handle
acpi_ns_convert_entry_to_handle (
struct acpi_namespace_node *node)
{
/*
* Simple implementation for now;
*/
return ((acpi_handle) node);
/* ---------------------------------------------------
if (!Node)
{
return (NULL);
}
if (Node == acpi_gbl_root_node)
{
return (ACPI_ROOT_OBJECT);
}
return ((acpi_handle) Node);
------------------------------------------------------*/
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_terminate
*
* PARAMETERS: none
*
* RETURN: none
*
* DESCRIPTION: free memory allocated for table storage.
*
******************************************************************************/
void
acpi_ns_terminate (void)
{
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_TRACE ("ns_terminate");
/*
* 1) Free the entire namespace -- all nodes and objects
*
* Delete all object descriptors attached to namepsace nodes
*/
acpi_ns_delete_namespace_subtree (acpi_gbl_root_node);
/* Detach any objects attached to the root */
obj_desc = acpi_ns_get_attached_object (acpi_gbl_root_node);
if (obj_desc) {
acpi_ns_detach_object (acpi_gbl_root_node);
}
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freed\n"));
/*
* 2) Now we can delete the ACPI tables
*/
acpi_tb_delete_all_tables ();
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "ACPI Tables freed\n"));
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_opens_scope
*
* PARAMETERS: Type - A valid namespace type
*
* RETURN: NEWSCOPE if the passed type "opens a name scope" according
* to the ACPI specification, else 0
*
******************************************************************************/
u32
acpi_ns_opens_scope (
acpi_object_type type)
{
ACPI_FUNCTION_TRACE_STR ("ns_opens_scope", acpi_ut_get_type_name (type));
if (!acpi_ut_valid_object_type (type)) {
/* type code out of range */
ACPI_REPORT_WARNING (("ns_opens_scope: Invalid Object Type %X\n", type));
return_VALUE (ACPI_NS_NORMAL);
}
return_VALUE (((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_node_by_path
*
* PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
* \ (backslash) and ^ (carat) prefixes, and the
* . (period) to separate segments are supported.
* start_node - Root of subtree to be searched, or NS_ALL for the
* root of the name space. If Name is fully
* qualified (first s8 is '\'), the passed value
* of Scope will not be accessed.
* Flags - Used to indicate whether to perform upsearch or
* not.
* return_node - Where the Node is returned
*
* DESCRIPTION: Look up a name relative to a given scope and return the
* corresponding Node. NOTE: Scope can be null.
*
* MUTEX: Locks namespace
*
******************************************************************************/
acpi_status
acpi_ns_get_node_by_path (
char *pathname,
struct acpi_namespace_node *start_node,
u32 flags,
struct acpi_namespace_node **return_node)
{
union acpi_generic_state scope_info;
acpi_status status;
char *internal_path = NULL;
ACPI_FUNCTION_TRACE_PTR ("ns_get_node_by_path", pathname);
if (pathname) {
/* Convert path to internal representation */
status = acpi_ns_internalize_name (pathname, &internal_path);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
/* Must lock namespace during lookup */
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
/* Setup lookup scope (search starting point) */
scope_info.scope.node = start_node;
/* Lookup the name in the namespace */
status = acpi_ns_lookup (&scope_info, internal_path,
ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
(flags | ACPI_NS_DONT_OPEN_SCOPE),
NULL, return_node);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s, %s\n",
internal_path, acpi_format_exception (status)));
}
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
cleanup:
/* Cleanup */
if (internal_path) {
ACPI_MEM_FREE (internal_path);
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_find_parent_name
*
* PARAMETERS: *child_node - Named Obj whose name is to be found
*
* RETURN: The ACPI name
*
* DESCRIPTION: Search for the given obj in its parent scope and return the
* name segment, or "????" if the parent name can't be found
* (which "should not happen").
*
******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
acpi_name
acpi_ns_find_parent_name (
struct acpi_namespace_node *child_node)
{
struct acpi_namespace_node *parent_node;
ACPI_FUNCTION_TRACE ("ns_find_parent_name");
if (child_node) {
/* Valid entry. Get the parent Node */
parent_node = acpi_ns_get_parent_node (child_node);
if (parent_node) {
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Parent of %p [%4.4s] is %p [%4.4s]\n",
child_node, acpi_ut_get_node_name (child_node),
parent_node, acpi_ut_get_node_name (parent_node)));
if (parent_node->name.integer) {
return_VALUE ((acpi_name) parent_node->name.integer);
}
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Unable to find parent of %p (%4.4s)\n",
child_node, acpi_ut_get_node_name (child_node)));
}
return_VALUE (ACPI_UNKNOWN_NAME);
}
#endif
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_parent_node
*
* PARAMETERS: Node - Current table entry
*
* RETURN: Parent entry of the given entry
*
* DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
*
******************************************************************************/
struct acpi_namespace_node *
acpi_ns_get_parent_node (
struct acpi_namespace_node *node)
{
ACPI_FUNCTION_ENTRY ();
if (!node) {
return (NULL);
}
/*
* Walk to the end of this peer list. The last entry is marked with a flag
* and the peer pointer is really a pointer back to the parent. This saves
* putting a parent back pointer in each and every named object!
*/
while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
node = node->peer;
}
return (node->peer);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_next_valid_node
*
* PARAMETERS: Node - Current table entry
*
* RETURN: Next valid Node in the linked node list. NULL if no more valid
* nodes.
*
* DESCRIPTION: Find the next valid node within a name table.
* Useful for implementing NULL-end-of-list loops.
*
******************************************************************************/
struct acpi_namespace_node *
acpi_ns_get_next_valid_node (
struct acpi_namespace_node *node)
{
/* If we are at the end of this peer list, return NULL */
if (node->flags & ANOBJ_END_OF_PEER_LIST) {
return NULL;
}
/* Otherwise just return the next peer */
return (node->peer);
}
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