NetBSD-5.0.2/sys/dist/acpica/nsnames.c
/*******************************************************************************
*
* Module Name: nsnames - Name manipulation and search
* $Revision: 1.5 $
*
******************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#define __NSNAMES_C__
#include "acpi.h"
#include "amlcode.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME ("nsnames")
/*******************************************************************************
*
* FUNCTION: AcpiNsBuildExternalPath
*
* PARAMETERS: Node - NS node whose pathname is needed
* Size - Size of the pathname
* *NameBuffer - Where to return the pathname
*
* RETURN: Places the pathname into the NameBuffer, in external format
* (name segments separated by path separators)
*
* DESCRIPTION: Generate a full pathaname
*
******************************************************************************/
void
AcpiNsBuildExternalPath (
ACPI_NAMESPACE_NODE *Node,
ACPI_SIZE Size,
char *NameBuffer)
{
ACPI_SIZE Index;
ACPI_NAMESPACE_NODE *ParentNode;
ACPI_FUNCTION_ENTRY ();
/* Special case for root */
Index = Size - 1;
if (Index < ACPI_NAME_SIZE)
{
NameBuffer[0] = AML_ROOT_PREFIX;
NameBuffer[1] = 0;
return;
}
/* Store terminator byte, then build name backwards */
ParentNode = Node;
NameBuffer[Index] = 0;
while ((Index > ACPI_NAME_SIZE) && (ParentNode != AcpiGbl_RootNode))
{
Index -= ACPI_NAME_SIZE;
/* Put the name into the buffer */
ACPI_MOVE_32_TO_32 ((NameBuffer + Index), &ParentNode->Name);
ParentNode = AcpiNsGetParentNode (ParentNode);
/* Prefix name with the path separator */
Index--;
NameBuffer[Index] = ACPI_PATH_SEPARATOR;
}
/* Overwrite final separator with the root prefix character */
NameBuffer[Index] = AML_ROOT_PREFIX;
if (Index != 0)
{
ACPI_ERROR ((AE_INFO,
"Could not construct pathname; index=%X, size=%X, Path=%s",
(UINT32) Index, (UINT32) Size, &NameBuffer[Size]));
}
return;
}
#ifdef ACPI_DEBUG_OUTPUT
/*******************************************************************************
*
* FUNCTION: AcpiNsGetExternalPathname
*
* PARAMETERS: Node - Namespace node whose pathname is needed
*
* RETURN: Pointer to storage containing the fully qualified name of
* the node, In external format (name segments separated by path
* separators.)
*
* DESCRIPTION: Used for debug printing in AcpiNsSearchTable().
*
******************************************************************************/
char *
AcpiNsGetExternalPathname (
ACPI_NAMESPACE_NODE *Node)
{
char *NameBuffer;
ACPI_SIZE Size;
ACPI_FUNCTION_TRACE_PTR (NsGetExternalPathname, Node);
/* Calculate required buffer size based on depth below root */
Size = AcpiNsGetPathnameLength (Node);
/* Allocate a buffer to be returned to caller */
NameBuffer = ACPI_ALLOCATE_ZEROED (Size);
if (!NameBuffer)
{
ACPI_ERROR ((AE_INFO, "Allocation failure"));
return_PTR (NULL);
}
/* Build the path in the allocated buffer */
AcpiNsBuildExternalPath (Node, Size, NameBuffer);
return_PTR (NameBuffer);
}
#endif
/*******************************************************************************
*
* FUNCTION: AcpiNsGetPathnameLength
*
* PARAMETERS: Node - Namespace node
*
* RETURN: Length of path, including prefix
*
* DESCRIPTION: Get the length of the pathname string for this node
*
******************************************************************************/
ACPI_SIZE
AcpiNsGetPathnameLength (
ACPI_NAMESPACE_NODE *Node)
{
ACPI_SIZE Size;
ACPI_NAMESPACE_NODE *NextNode;
ACPI_FUNCTION_ENTRY ();
/*
* Compute length of pathname as 5 * number of name segments.
* Go back up the parent tree to the root
*/
Size = 0;
NextNode = Node;
while (NextNode && (NextNode != AcpiGbl_RootNode))
{
if (ACPI_GET_DESCRIPTOR_TYPE (NextNode) != ACPI_DESC_TYPE_NAMED)
{
ACPI_ERROR ((AE_INFO, "Invalid NS Node (%p) while traversing path",
NextNode));
return 0;
}
Size += ACPI_PATH_SEGMENT_LENGTH;
NextNode = AcpiNsGetParentNode (NextNode);
}
if (!Size)
{
Size = 1; /* Root node case */
}
return (Size + 1); /* +1 for null string terminator */
}
/*******************************************************************************
*
* FUNCTION: AcpiNsHandleToPathname
*
* PARAMETERS: TargetHandle - Handle of named object whose name is
* to be found
* Buffer - Where the pathname is returned
*
* RETURN: Status, Buffer is filled with pathname if status is AE_OK
*
* DESCRIPTION: Build and return a full namespace pathname
*
******************************************************************************/
ACPI_STATUS
AcpiNsHandleToPathname (
ACPI_HANDLE TargetHandle,
ACPI_BUFFER *Buffer)
{
ACPI_STATUS Status;
ACPI_NAMESPACE_NODE *Node;
ACPI_SIZE RequiredSize;
ACPI_FUNCTION_TRACE_PTR (NsHandleToPathname, TargetHandle);
Node = AcpiNsMapHandleToNode (TargetHandle);
if (!Node)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Determine size required for the caller buffer */
RequiredSize = AcpiNsGetPathnameLength (Node);
/* Validate/Allocate/Clear caller buffer */
Status = AcpiUtInitializeBuffer (Buffer, RequiredSize);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Build the path in the caller buffer */
AcpiNsBuildExternalPath (Node, RequiredSize, Buffer->Pointer);
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s [%X]\n",
(char *) Buffer->Pointer, (UINT32) RequiredSize));
return_ACPI_STATUS (AE_OK);
}