You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
381 lines
12 KiB
381 lines
12 KiB
/*******************************************************************************
|
|
*
|
|
* Module Name: nssearch - Namespace search
|
|
*
|
|
******************************************************************************/
|
|
|
|
/*
|
|
* 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>
|
|
|
|
#define _COMPONENT ACPI_NAMESPACE
|
|
ACPI_MODULE_NAME("nssearch")
|
|
|
|
/* Local prototypes */
|
|
static acpi_status
|
|
acpi_ns_search_parent_tree(u32 target_name,
|
|
struct acpi_namespace_node *node,
|
|
acpi_object_type type,
|
|
struct acpi_namespace_node **return_node);
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ns_search_node
|
|
*
|
|
* PARAMETERS: target_name - Ascii ACPI name to search for
|
|
* Node - Starting node where search will begin
|
|
* Type - Object type to match
|
|
* return_node - Where the matched Named obj is returned
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Search a single level of the namespace. Performs a
|
|
* simple search of the specified level, and does not add
|
|
* entries or search parents.
|
|
*
|
|
*
|
|
* Named object lists are built (and subsequently dumped) in the
|
|
* order in which the names are encountered during the namespace load;
|
|
*
|
|
* All namespace searching is linear in this implementation, but
|
|
* could be easily modified to support any improved search
|
|
* algorithm. However, the linear search was chosen for simplicity
|
|
* and because the trees are small and the other interpreter
|
|
* execution overhead is relatively high.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ns_search_node(u32 target_name,
|
|
struct acpi_namespace_node *node,
|
|
acpi_object_type type,
|
|
struct acpi_namespace_node **return_node)
|
|
{
|
|
struct acpi_namespace_node *next_node;
|
|
|
|
ACPI_FUNCTION_TRACE("ns_search_node");
|
|
|
|
#ifdef ACPI_DEBUG_OUTPUT
|
|
if (ACPI_LV_NAMES & acpi_dbg_level) {
|
|
char *scope_name;
|
|
|
|
scope_name = acpi_ns_get_external_pathname(node);
|
|
if (scope_name) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
|
"Searching %s (%p) For [%4.4s] (%s)\n",
|
|
scope_name, node,
|
|
(char *)&target_name,
|
|
acpi_ut_get_type_name(type)));
|
|
|
|
ACPI_MEM_FREE(scope_name);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Search for name at this namespace level, which is to say that we
|
|
* must search for the name among the children of this object
|
|
*/
|
|
next_node = node->child;
|
|
while (next_node) {
|
|
/* Check for match against the name */
|
|
|
|
if (next_node->name.integer == target_name) {
|
|
/* Resolve a control method alias if any */
|
|
|
|
if (acpi_ns_get_type(next_node) ==
|
|
ACPI_TYPE_LOCAL_METHOD_ALIAS) {
|
|
next_node =
|
|
ACPI_CAST_PTR(struct acpi_namespace_node,
|
|
next_node->object);
|
|
}
|
|
|
|
/*
|
|
* Found matching entry.
|
|
*/
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
|
"Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n",
|
|
(char *)&target_name,
|
|
acpi_ut_get_type_name(next_node->
|
|
type),
|
|
next_node,
|
|
acpi_ut_get_node_name(node), node));
|
|
|
|
*return_node = next_node;
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|
|
|
|
/*
|
|
* The last entry in the list points back to the parent,
|
|
* so a flag is used to indicate the end-of-list
|
|
*/
|
|
if (next_node->flags & ANOBJ_END_OF_PEER_LIST) {
|
|
/* Searched entire list, we are done */
|
|
|
|
break;
|
|
}
|
|
|
|
/* Didn't match name, move on to the next peer object */
|
|
|
|
next_node = next_node->peer;
|
|
}
|
|
|
|
/* Searched entire namespace level, not found */
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
|
"Name [%4.4s] (%s) not found in search in scope [%4.4s] %p first child %p\n",
|
|
(char *)&target_name, acpi_ut_get_type_name(type),
|
|
acpi_ut_get_node_name(node), node, node->child));
|
|
|
|
return_ACPI_STATUS(AE_NOT_FOUND);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ns_search_parent_tree
|
|
*
|
|
* PARAMETERS: target_name - Ascii ACPI name to search for
|
|
* Node - Starting node where search will begin
|
|
* Type - Object type to match
|
|
* return_node - Where the matched Node is returned
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Called when a name has not been found in the current namespace
|
|
* level. Before adding it or giving up, ACPI scope rules require
|
|
* searching enclosing scopes in cases identified by acpi_ns_local().
|
|
*
|
|
* "A name is located by finding the matching name in the current
|
|
* name space, and then in the parent name space. If the parent
|
|
* name space does not contain the name, the search continues
|
|
* recursively until either the name is found or the name space
|
|
* does not have a parent (the root of the name space). This
|
|
* indicates that the name is not found" (From ACPI Specification,
|
|
* section 5.3)
|
|
*
|
|
******************************************************************************/
|
|
|
|
static acpi_status
|
|
acpi_ns_search_parent_tree(u32 target_name,
|
|
struct acpi_namespace_node *node,
|
|
acpi_object_type type,
|
|
struct acpi_namespace_node **return_node)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_namespace_node *parent_node;
|
|
|
|
ACPI_FUNCTION_TRACE("ns_search_parent_tree");
|
|
|
|
parent_node = acpi_ns_get_parent_node(node);
|
|
|
|
/*
|
|
* If there is no parent (i.e., we are at the root) or type is "local",
|
|
* we won't be searching the parent tree.
|
|
*/
|
|
if (!parent_node) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "[%4.4s] has no parent\n",
|
|
(char *)&target_name));
|
|
return_ACPI_STATUS(AE_NOT_FOUND);
|
|
}
|
|
|
|
if (acpi_ns_local(type)) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
|
"[%4.4s] type [%s] must be local to this scope (no parent search)\n",
|
|
(char *)&target_name,
|
|
acpi_ut_get_type_name(type)));
|
|
return_ACPI_STATUS(AE_NOT_FOUND);
|
|
}
|
|
|
|
/* Search the parent tree */
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
|
"Searching parent [%4.4s] for [%4.4s]\n",
|
|
acpi_ut_get_node_name(parent_node),
|
|
(char *)&target_name));
|
|
|
|
/*
|
|
* Search parents until target is found or we have backed up to the root
|
|
*/
|
|
while (parent_node) {
|
|
/*
|
|
* Search parent scope. Use TYPE_ANY because we don't care about the
|
|
* object type at this point, we only care about the existence of
|
|
* the actual name we are searching for. Typechecking comes later.
|
|
*/
|
|
status = acpi_ns_search_node(target_name, parent_node,
|
|
ACPI_TYPE_ANY, return_node);
|
|
if (ACPI_SUCCESS(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*
|
|
* Not found here, go up another level
|
|
* (until we reach the root)
|
|
*/
|
|
parent_node = acpi_ns_get_parent_node(parent_node);
|
|
}
|
|
|
|
/* Not found in parent tree */
|
|
|
|
return_ACPI_STATUS(AE_NOT_FOUND);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ns_search_and_enter
|
|
*
|
|
* PARAMETERS: target_name - Ascii ACPI name to search for (4 chars)
|
|
* walk_state - Current state of the walk
|
|
* Node - Starting node where search will begin
|
|
* interpreter_mode - Add names only in ACPI_MODE_LOAD_PASS_x.
|
|
* Otherwise,search only.
|
|
* Type - Object type to match
|
|
* Flags - Flags describing the search restrictions
|
|
* return_node - Where the Node is returned
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Search for a name segment in a single namespace level,
|
|
* optionally adding it if it is not found. If the passed
|
|
* Type is not Any and the type previously stored in the
|
|
* entry was Any (i.e. unknown), update the stored type.
|
|
*
|
|
* In ACPI_IMODE_EXECUTE, search only.
|
|
* In other modes, search and add if not found.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ns_search_and_enter(u32 target_name,
|
|
struct acpi_walk_state *walk_state,
|
|
struct acpi_namespace_node *node,
|
|
acpi_interpreter_mode interpreter_mode,
|
|
acpi_object_type type,
|
|
u32 flags, struct acpi_namespace_node **return_node)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_namespace_node *new_node;
|
|
|
|
ACPI_FUNCTION_TRACE("ns_search_and_enter");
|
|
|
|
/* Parameter validation */
|
|
|
|
if (!node || !target_name || !return_node) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
|
|
"Null param: Node %p Name %X return_node %p\n",
|
|
node, target_name, return_node));
|
|
|
|
ACPI_REPORT_ERROR(("ns_search_and_enter: Null parameter\n"));
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
|
}
|
|
|
|
/* Name must consist of printable characters */
|
|
|
|
if (!acpi_ut_valid_acpi_name(target_name)) {
|
|
ACPI_REPORT_ERROR(("ns_search_and_enter: Bad character in ACPI Name: %X\n", target_name));
|
|
return_ACPI_STATUS(AE_BAD_CHARACTER);
|
|
}
|
|
|
|
/* Try to find the name in the namespace level specified by the caller */
|
|
|
|
*return_node = ACPI_ENTRY_NOT_FOUND;
|
|
status = acpi_ns_search_node(target_name, node, type, return_node);
|
|
if (status != AE_NOT_FOUND) {
|
|
/*
|
|
* If we found it AND the request specifies that a find is an error,
|
|
* return the error
|
|
*/
|
|
if ((status == AE_OK) && (flags & ACPI_NS_ERROR_IF_FOUND)) {
|
|
status = AE_ALREADY_EXISTS;
|
|
}
|
|
|
|
/*
|
|
* Either found it or there was an error
|
|
* -- finished either way
|
|
*/
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*
|
|
* The name was not found. If we are NOT performing the first pass
|
|
* (name entry) of loading the namespace, search the parent tree (all the
|
|
* way to the root if necessary.) We don't want to perform the parent
|
|
* search when the namespace is actually being loaded. We want to perform
|
|
* the search when namespace references are being resolved (load pass 2)
|
|
* and during the execution phase.
|
|
*/
|
|
if ((interpreter_mode != ACPI_IMODE_LOAD_PASS1) &&
|
|
(flags & ACPI_NS_SEARCH_PARENT)) {
|
|
/*
|
|
* Not found at this level - search parent tree according to the
|
|
* ACPI specification
|
|
*/
|
|
status =
|
|
acpi_ns_search_parent_tree(target_name, node, type,
|
|
return_node);
|
|
if (ACPI_SUCCESS(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* In execute mode, just search, never add names. Exit now.
|
|
*/
|
|
if (interpreter_mode == ACPI_IMODE_EXECUTE) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
|
"%4.4s Not found in %p [Not adding]\n",
|
|
(char *)&target_name, node));
|
|
|
|
return_ACPI_STATUS(AE_NOT_FOUND);
|
|
}
|
|
|
|
/* Create the new named object */
|
|
|
|
new_node = acpi_ns_create_node(target_name);
|
|
if (!new_node) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
/* Install the new object into the parent's list of children */
|
|
|
|
acpi_ns_install_node(walk_state, node, new_node, type);
|
|
*return_node = new_node;
|
|
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|
|
|