422 lines
14 KiB
C
422 lines
14 KiB
C
/*******************************************************************************
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*
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* Module Name: nssearch - Namespace search
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2014, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "acnamesp.h"
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#ifdef ACPI_ASL_COMPILER
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#include "amlcode.h"
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#endif
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME ("nssearch")
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/* Local prototypes */
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static ACPI_STATUS
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AcpiNsSearchParentTree (
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UINT32 TargetName,
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ACPI_NAMESPACE_NODE *Node,
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ACPI_OBJECT_TYPE Type,
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ACPI_NAMESPACE_NODE **ReturnNode);
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsSearchOneScope
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*
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* PARAMETERS: TargetName - Ascii ACPI name to search for
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* ParentNode - Starting node where search will begin
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* Type - Object type to match
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* ReturnNode - Where the matched Named obj is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Search a single level of the namespace. Performs a
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* simple search of the specified level, and does not add
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* entries or search parents.
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*
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*
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* Named object lists are built (and subsequently dumped) in the
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* order in which the names are encountered during the namespace load;
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*
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* All namespace searching is linear in this implementation, but
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* could be easily modified to support any improved search
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* algorithm. However, the linear search was chosen for simplicity
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* and because the trees are small and the other interpreter
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* execution overhead is relatively high.
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*
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* Note: CPU execution analysis has shown that the AML interpreter spends
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* a very small percentage of its time searching the namespace. Therefore,
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* the linear search seems to be sufficient, as there would seem to be
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* little value in improving the search.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsSearchOneScope (
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UINT32 TargetName,
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ACPI_NAMESPACE_NODE *ParentNode,
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ACPI_OBJECT_TYPE Type,
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ACPI_NAMESPACE_NODE **ReturnNode)
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{
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ACPI_NAMESPACE_NODE *Node;
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ACPI_FUNCTION_TRACE (NsSearchOneScope);
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#ifdef ACPI_DEBUG_OUTPUT
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if (ACPI_LV_NAMES & AcpiDbgLevel)
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{
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char *ScopeName;
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ScopeName = AcpiNsGetExternalPathname (ParentNode);
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if (ScopeName)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Searching %s (%p) For [%4.4s] (%s)\n",
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ScopeName, ParentNode, ACPI_CAST_PTR (char, &TargetName),
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AcpiUtGetTypeName (Type)));
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ACPI_FREE (ScopeName);
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}
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}
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#endif
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/*
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* Search for name at this namespace level, which is to say that we
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* must search for the name among the children of this object
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*/
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Node = ParentNode->Child;
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while (Node)
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{
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/* Check for match against the name */
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if (Node->Name.Integer == TargetName)
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{
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/* Resolve a control method alias if any */
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if (AcpiNsGetType (Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
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{
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Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
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}
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/* Found matching entry */
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n",
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ACPI_CAST_PTR (char, &TargetName),
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AcpiUtGetTypeName (Node->Type),
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Node, AcpiUtGetNodeName (ParentNode), ParentNode));
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*ReturnNode = Node;
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return_ACPI_STATUS (AE_OK);
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}
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/* Didn't match name, move on to the next peer object */
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Node = Node->Peer;
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}
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/* Searched entire namespace level, not found */
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Name [%4.4s] (%s) not found in search in scope [%4.4s] "
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"%p first child %p\n",
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ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (Type),
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AcpiUtGetNodeName (ParentNode), ParentNode, ParentNode->Child));
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsSearchParentTree
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*
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* PARAMETERS: TargetName - Ascii ACPI name to search for
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* Node - Starting node where search will begin
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* Type - Object type to match
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* ReturnNode - Where the matched Node is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Called when a name has not been found in the current namespace
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* level. Before adding it or giving up, ACPI scope rules require
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* searching enclosing scopes in cases identified by AcpiNsLocal().
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*
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* "A name is located by finding the matching name in the current
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* name space, and then in the parent name space. If the parent
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* name space does not contain the name, the search continues
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* recursively until either the name is found or the name space
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* does not have a parent (the root of the name space). This
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* indicates that the name is not found" (From ACPI Specification,
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* section 5.3)
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiNsSearchParentTree (
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UINT32 TargetName,
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ACPI_NAMESPACE_NODE *Node,
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ACPI_OBJECT_TYPE Type,
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ACPI_NAMESPACE_NODE **ReturnNode)
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{
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ACPI_STATUS Status;
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ACPI_NAMESPACE_NODE *ParentNode;
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ACPI_FUNCTION_TRACE (NsSearchParentTree);
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ParentNode = Node->Parent;
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/*
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* If there is no parent (i.e., we are at the root) or type is "local",
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* we won't be searching the parent tree.
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*/
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if (!ParentNode)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "[%4.4s] has no parent\n",
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ACPI_CAST_PTR (char, &TargetName)));
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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if (AcpiNsLocal (Type))
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"[%4.4s] type [%s] must be local to this scope (no parent search)\n",
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ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (Type)));
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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/* Search the parent tree */
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Searching parent [%4.4s] for [%4.4s]\n",
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AcpiUtGetNodeName (ParentNode), ACPI_CAST_PTR (char, &TargetName)));
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/* Search parents until target is found or we have backed up to the root */
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while (ParentNode)
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{
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/*
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* Search parent scope. Use TYPE_ANY because we don't care about the
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* object type at this point, we only care about the existence of
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* the actual name we are searching for. Typechecking comes later.
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*/
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Status = AcpiNsSearchOneScope (
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TargetName, ParentNode, ACPI_TYPE_ANY, ReturnNode);
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if (ACPI_SUCCESS (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/* Not found here, go up another level (until we reach the root) */
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ParentNode = ParentNode->Parent;
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}
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/* Not found in parent tree */
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsSearchAndEnter
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*
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* PARAMETERS: TargetName - Ascii ACPI name to search for (4 chars)
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* WalkState - Current state of the walk
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* Node - Starting node where search will begin
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* InterpreterMode - Add names only in ACPI_MODE_LOAD_PASS_x.
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* Otherwise,search only.
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* Type - Object type to match
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* Flags - Flags describing the search restrictions
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* ReturnNode - Where the Node is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Search for a name segment in a single namespace level,
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* optionally adding it if it is not found. If the passed
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* Type is not Any and the type previously stored in the
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* entry was Any (i.e. unknown), update the stored type.
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*
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* In ACPI_IMODE_EXECUTE, search only.
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* In other modes, search and add if not found.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsSearchAndEnter (
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UINT32 TargetName,
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ACPI_WALK_STATE *WalkState,
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ACPI_NAMESPACE_NODE *Node,
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ACPI_INTERPRETER_MODE InterpreterMode,
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ACPI_OBJECT_TYPE Type,
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UINT32 Flags,
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ACPI_NAMESPACE_NODE **ReturnNode)
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{
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ACPI_STATUS Status;
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ACPI_NAMESPACE_NODE *NewNode;
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ACPI_FUNCTION_TRACE (NsSearchAndEnter);
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/* Parameter validation */
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if (!Node || !TargetName || !ReturnNode)
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{
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ACPI_ERROR ((AE_INFO,
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"Null parameter: Node %p Name 0x%X ReturnNode %p",
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Node, TargetName, ReturnNode));
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/*
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* Name must consist of valid ACPI characters. We will repair the name if
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* necessary because we don't want to abort because of this, but we want
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* all namespace names to be printable. A warning message is appropriate.
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*
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* This issue came up because there are in fact machines that exhibit
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* this problem, and we want to be able to enable ACPI support for them,
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* even though there are a few bad names.
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*/
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AcpiUtRepairName (ACPI_CAST_PTR (char, &TargetName));
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/* Try to find the name in the namespace level specified by the caller */
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*ReturnNode = ACPI_ENTRY_NOT_FOUND;
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Status = AcpiNsSearchOneScope (TargetName, Node, Type, ReturnNode);
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if (Status != AE_NOT_FOUND)
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{
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/*
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* If we found it AND the request specifies that a find is an error,
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* return the error
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*/
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if ((Status == AE_OK) &&
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(Flags & ACPI_NS_ERROR_IF_FOUND))
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{
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Status = AE_ALREADY_EXISTS;
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}
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#ifdef ACPI_ASL_COMPILER
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if (*ReturnNode && (*ReturnNode)->Type == ACPI_TYPE_ANY)
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{
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(*ReturnNode)->Flags |= ANOBJ_IS_EXTERNAL;
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}
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#endif
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/* Either found it or there was an error: finished either way */
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return_ACPI_STATUS (Status);
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}
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/*
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* The name was not found. If we are NOT performing the first pass
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* (name entry) of loading the namespace, search the parent tree (all the
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* way to the root if necessary.) We don't want to perform the parent
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* search when the namespace is actually being loaded. We want to perform
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* the search when namespace references are being resolved (load pass 2)
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* and during the execution phase.
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*/
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if ((InterpreterMode != ACPI_IMODE_LOAD_PASS1) &&
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(Flags & ACPI_NS_SEARCH_PARENT))
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{
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/*
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* Not found at this level - search parent tree according to the
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* ACPI specification
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*/
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Status = AcpiNsSearchParentTree (TargetName, Node, Type, ReturnNode);
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if (ACPI_SUCCESS (Status))
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{
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return_ACPI_STATUS (Status);
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}
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}
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/* In execute mode, just search, never add names. Exit now */
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if (InterpreterMode == ACPI_IMODE_EXECUTE)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"%4.4s Not found in %p [Not adding]\n",
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ACPI_CAST_PTR (char, &TargetName), Node));
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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/* Create the new named object */
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NewNode = AcpiNsCreateNode (TargetName);
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if (!NewNode)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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#ifdef ACPI_ASL_COMPILER
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/* Node is an object defined by an External() statement */
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if (Flags & ACPI_NS_EXTERNAL ||
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(WalkState && WalkState->Opcode == AML_SCOPE_OP))
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{
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NewNode->Flags |= ANOBJ_IS_EXTERNAL;
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}
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#endif
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if (Flags & ACPI_NS_TEMPORARY)
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{
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NewNode->Flags |= ANOBJ_TEMPORARY;
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}
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/* Install the new object into the parent's list of children */
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AcpiNsInstallNode (WalkState, Node, NewNode, Type);
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*ReturnNode = NewNode;
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return_ACPI_STATUS (AE_OK);
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}
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