+++ /dev/null
-/*******************************************************************************
- *
- * Module Name: nssearch - Namespace search
- *
- ******************************************************************************/
-
-/*
- * Copyright (C) 2000 - 2017, Intel Corp.
- * 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.h"
-#include "accommon.h"
-#include "acnamesp.h"
-
-#ifdef ACPI_ASL_COMPILER
-#include "amlcode.h"
-#endif
-
-#define _COMPONENT ACPI_NAMESPACE
- ACPI_MODULE_NAME ("nssearch")
-
-/* Local prototypes */
-
-static ACPI_STATUS
-AcpiNsSearchParentTree (
- UINT32 TargetName,
- ACPI_NAMESPACE_NODE *Node,
- ACPI_OBJECT_TYPE Type,
- ACPI_NAMESPACE_NODE **ReturnNode);
-
-
-/*******************************************************************************
- *
- * FUNCTION: AcpiNsSearchOneScope
- *
- * PARAMETERS: TargetName - Ascii ACPI name to search for
- * ParentNode - Starting node where search will begin
- * Type - Object type to match
- * ReturnNode - 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.
- *
- * Note: CPU execution analysis has shown that the AML interpreter spends
- * a very small percentage of its time searching the namespace. Therefore,
- * the linear search seems to be sufficient, as there would seem to be
- * little value in improving the search.
- *
- ******************************************************************************/
-
-ACPI_STATUS
-AcpiNsSearchOneScope (
- UINT32 TargetName,
- ACPI_NAMESPACE_NODE *ParentNode,
- ACPI_OBJECT_TYPE Type,
- ACPI_NAMESPACE_NODE **ReturnNode)
-{
- ACPI_NAMESPACE_NODE *Node;
-
-
- ACPI_FUNCTION_TRACE (NsSearchOneScope);
-
-
-#ifdef ACPI_DEBUG_OUTPUT
- if (ACPI_LV_NAMES & AcpiDbgLevel)
- {
- char *ScopeName;
-
- ScopeName = AcpiNsGetNormalizedPathname (ParentNode, TRUE);
- if (ScopeName)
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
- "Searching %s (%p) For [%4.4s] (%s)\n",
- ScopeName, ParentNode, ACPI_CAST_PTR (char, &TargetName),
- AcpiUtGetTypeName (Type)));
-
- ACPI_FREE (ScopeName);
- }
- }
-#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
- */
- Node = ParentNode->Child;
- while (Node)
- {
- /* Check for match against the name */
-
- if (Node->Name.Integer == TargetName)
- {
- /* Resolve a control method alias if any */
-
- if (AcpiNsGetType (Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
- {
- Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
- }
-
- /* Found matching entry */
-
- ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
- "Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n",
- ACPI_CAST_PTR (char, &TargetName),
- AcpiUtGetTypeName (Node->Type),
- Node, AcpiUtGetNodeName (ParentNode), ParentNode));
-
- *ReturnNode = Node;
- return_ACPI_STATUS (AE_OK);
- }
-
- /* Didn't match name, move on to the next peer object */
-
- Node = 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",
- ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (Type),
- AcpiUtGetNodeName (ParentNode), ParentNode, ParentNode->Child));
-
- return_ACPI_STATUS (AE_NOT_FOUND);
-}
-
-
-/*******************************************************************************
- *
- * FUNCTION: AcpiNsSearchParentTree
- *
- * PARAMETERS: TargetName - Ascii ACPI name to search for
- * Node - Starting node where search will begin
- * Type - Object type to match
- * ReturnNode - 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 AcpiNsLocal().
- *
- * "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
-AcpiNsSearchParentTree (
- UINT32 TargetName,
- ACPI_NAMESPACE_NODE *Node,
- ACPI_OBJECT_TYPE Type,
- ACPI_NAMESPACE_NODE **ReturnNode)
-{
- ACPI_STATUS Status;
- ACPI_NAMESPACE_NODE *ParentNode;
-
-
- ACPI_FUNCTION_TRACE (NsSearchParentTree);
-
-
- ParentNode = Node->Parent;
-
- /*
- * 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 (!ParentNode)
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "[%4.4s] has no parent\n",
- ACPI_CAST_PTR (char, &TargetName)));
- return_ACPI_STATUS (AE_NOT_FOUND);
- }
-
- if (AcpiNsLocal (Type))
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
- "[%4.4s] type [%s] must be local to this scope (no parent search)\n",
- ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (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",
- AcpiUtGetNodeName (ParentNode), ACPI_CAST_PTR (char, &TargetName)));
-
- /* Search parents until target is found or we have backed up to the root */
-
- while (ParentNode)
- {
- /*
- * 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 = AcpiNsSearchOneScope (
- TargetName, ParentNode, ACPI_TYPE_ANY, ReturnNode);
- if (ACPI_SUCCESS (Status))
- {
- return_ACPI_STATUS (Status);
- }
-
- /* Not found here, go up another level (until we reach the root) */
-
- ParentNode = ParentNode->Parent;
- }
-
- /* Not found in parent tree */
-
- return_ACPI_STATUS (AE_NOT_FOUND);
-}
-
-
-/*******************************************************************************
- *
- * FUNCTION: AcpiNsSearchAndEnter
- *
- * PARAMETERS: TargetName - Ascii ACPI name to search for (4 chars)
- * WalkState - Current state of the walk
- * Node - Starting node where search will begin
- * InterpreterMode - Add names only in ACPI_MODE_LOAD_PASS_x.
- * Otherwise,search only.
- * Type - Object type to match
- * Flags - Flags describing the search restrictions
- * ReturnNode - 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
-AcpiNsSearchAndEnter (
- UINT32 TargetName,
- ACPI_WALK_STATE *WalkState,
- ACPI_NAMESPACE_NODE *Node,
- ACPI_INTERPRETER_MODE InterpreterMode,
- ACPI_OBJECT_TYPE Type,
- UINT32 Flags,
- ACPI_NAMESPACE_NODE **ReturnNode)
-{
- ACPI_STATUS Status;
- ACPI_NAMESPACE_NODE *NewNode;
-
-
- ACPI_FUNCTION_TRACE (NsSearchAndEnter);
-
-
- /* Parameter validation */
-
- if (!Node || !TargetName || !ReturnNode)
- {
- ACPI_ERROR ((AE_INFO,
- "Null parameter: Node %p Name 0x%X ReturnNode %p",
- Node, TargetName, ReturnNode));
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
-
- /*
- * Name must consist of valid ACPI characters. We will repair the name if
- * necessary because we don't want to abort because of this, but we want
- * all namespace names to be printable. A warning message is appropriate.
- *
- * This issue came up because there are in fact machines that exhibit
- * this problem, and we want to be able to enable ACPI support for them,
- * even though there are a few bad names.
- */
- AcpiUtRepairName (ACPI_CAST_PTR (char, &TargetName));
-
- /* Try to find the name in the namespace level specified by the caller */
-
- *ReturnNode = ACPI_ENTRY_NOT_FOUND;
- Status = AcpiNsSearchOneScope (TargetName, Node, Type, ReturnNode);
- 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)
- {
- /* The node was found in the namespace */
-
- /*
- * If the namespace override feature is enabled for this node,
- * delete any existing attached sub-object and make the node
- * look like a new node that is owned by the override table.
- */
- if (Flags & ACPI_NS_OVERRIDE_IF_FOUND)
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
- "Namespace override: %4.4s pass %u type %X Owner %X\n",
- ACPI_CAST_PTR(char, &TargetName), InterpreterMode,
- (*ReturnNode)->Type, WalkState->OwnerId));
-
- AcpiNsDeleteChildren (*ReturnNode);
- if (AcpiGbl_RuntimeNamespaceOverride)
- {
- AcpiUtRemoveReference ((*ReturnNode)->Object);
- (*ReturnNode)->Object = NULL;
- (*ReturnNode)->OwnerId = WalkState->OwnerId;
- }
- else
- {
- AcpiNsRemoveNode (*ReturnNode);
- *ReturnNode = ACPI_ENTRY_NOT_FOUND;
- }
- }
-
- /* Return an error if we don't expect to find the object */
-
- else if (Flags & ACPI_NS_ERROR_IF_FOUND)
- {
- Status = AE_ALREADY_EXISTS;
- }
- }
-
-#ifdef ACPI_ASL_COMPILER
- if (*ReturnNode && (*ReturnNode)->Type == ACPI_TYPE_ANY)
- {
- (*ReturnNode)->Flags |= ANOBJ_IS_EXTERNAL;
- }
-#endif
-
- /* 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 ((InterpreterMode != ACPI_IMODE_LOAD_PASS1) &&
- (Flags & ACPI_NS_SEARCH_PARENT))
- {
- /*
- * Not found at this level - search parent tree according to the
- * ACPI specification
- */
- Status = AcpiNsSearchParentTree (TargetName, Node, Type, ReturnNode);
- if (ACPI_SUCCESS (Status))
- {
- return_ACPI_STATUS (Status);
- }
- }
-
- /* In execute mode, just search, never add names. Exit now */
-
- if (InterpreterMode == ACPI_IMODE_EXECUTE)
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
- "%4.4s Not found in %p [Not adding]\n",
- ACPI_CAST_PTR (char, &TargetName), Node));
-
- return_ACPI_STATUS (AE_NOT_FOUND);
- }
-
- /* Create the new named object */
-
- NewNode = AcpiNsCreateNode (TargetName);
- if (!NewNode)
- {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
-
-#ifdef ACPI_ASL_COMPILER
-
- /* Node is an object defined by an External() statement */
-
- if (Flags & ACPI_NS_EXTERNAL ||
- (WalkState && WalkState->Opcode == AML_SCOPE_OP))
- {
- NewNode->Flags |= ANOBJ_IS_EXTERNAL;
- }
-#endif
-
- if (Flags & ACPI_NS_TEMPORARY)
- {
- NewNode->Flags |= ANOBJ_TEMPORARY;
- }
-
- /* Install the new object into the parent's list of children */
-
- AcpiNsInstallNode (WalkState, Node, NewNode, Type);
- *ReturnNode = NewNode;
- return_ACPI_STATUS (AE_OK);
-}
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