846 lines
22 KiB
C
846 lines
22 KiB
C
/******************************************************************************
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*
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* Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
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* parents and siblings and Scope manipulation
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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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#include "amlcode.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME ("nsutils")
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/* Local prototypes */
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#ifdef ACPI_OBSOLETE_FUNCTIONS
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ACPI_NAME
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AcpiNsFindParentName (
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ACPI_NAMESPACE_NODE *NodeToSearch);
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#endif
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsPrintNodePathname
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*
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* PARAMETERS: Node - Object
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* Message - Prefix message
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*
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* DESCRIPTION: Print an object's full namespace pathname
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* Manages allocation/freeing of a pathname buffer
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*
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******************************************************************************/
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void
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AcpiNsPrintNodePathname (
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ACPI_NAMESPACE_NODE *Node,
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const char *Message)
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{
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ACPI_BUFFER Buffer;
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ACPI_STATUS Status;
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if (!Node)
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{
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AcpiOsPrintf ("[NULL NAME]");
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return;
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}
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/* Convert handle to full pathname and print it (with supplied message) */
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Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
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Status = AcpiNsHandleToPathname (Node, &Buffer);
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if (ACPI_SUCCESS (Status))
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{
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if (Message)
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{
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AcpiOsPrintf ("%s ", Message);
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}
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AcpiOsPrintf ("[%s] (Node %p)", (char *) Buffer.Pointer, Node);
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ACPI_FREE (Buffer.Pointer);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsGetType
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*
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* PARAMETERS: Node - Parent Node to be examined
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*
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* RETURN: Type field from Node whose handle is passed
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*
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* DESCRIPTION: Return the type of a Namespace node
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*
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******************************************************************************/
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ACPI_OBJECT_TYPE
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AcpiNsGetType (
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ACPI_NAMESPACE_NODE *Node)
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{
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ACPI_FUNCTION_TRACE (NsGetType);
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if (!Node)
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{
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ACPI_WARNING ((AE_INFO, "Null Node parameter"));
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return_UINT8 (ACPI_TYPE_ANY);
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}
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return_UINT8 (Node->Type);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsLocal
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*
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* PARAMETERS: Type - A namespace object type
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*
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* RETURN: LOCAL if names must be found locally in objects of the
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* passed type, 0 if enclosing scopes should be searched
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*
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* DESCRIPTION: Returns scope rule for the given object type.
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*
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******************************************************************************/
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UINT32
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AcpiNsLocal (
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ACPI_OBJECT_TYPE Type)
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{
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ACPI_FUNCTION_TRACE (NsLocal);
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if (!AcpiUtValidObjectType (Type))
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{
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/* Type code out of range */
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ACPI_WARNING ((AE_INFO, "Invalid Object Type 0x%X", Type));
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return_UINT32 (ACPI_NS_NORMAL);
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}
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return_UINT32 (AcpiGbl_NsProperties[Type] & ACPI_NS_LOCAL);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsGetInternalNameLength
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*
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* PARAMETERS: Info - Info struct initialized with the
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* external name pointer.
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*
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* RETURN: None
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*
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* DESCRIPTION: Calculate the length of the internal (AML) namestring
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* corresponding to the external (ASL) namestring.
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*
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******************************************************************************/
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void
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AcpiNsGetInternalNameLength (
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ACPI_NAMESTRING_INFO *Info)
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{
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const char *NextExternalChar;
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UINT32 i;
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ACPI_FUNCTION_ENTRY ();
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NextExternalChar = Info->ExternalName;
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Info->NumCarats = 0;
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Info->NumSegments = 0;
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Info->FullyQualified = FALSE;
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/*
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* For the internal name, the required length is 4 bytes per segment, plus
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* 1 each for RootPrefix, MultiNamePrefixOp, segment count, trailing null
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* (which is not really needed, but no there's harm in putting it there)
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*
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* strlen() + 1 covers the first NameSeg, which has no path separator
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*/
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if (ACPI_IS_ROOT_PREFIX (*NextExternalChar))
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{
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Info->FullyQualified = TRUE;
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NextExternalChar++;
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/* Skip redundant RootPrefix, like \\_SB.PCI0.SBRG.EC0 */
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while (ACPI_IS_ROOT_PREFIX (*NextExternalChar))
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{
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NextExternalChar++;
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}
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}
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else
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{
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/* Handle Carat prefixes */
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while (ACPI_IS_PARENT_PREFIX (*NextExternalChar))
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{
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Info->NumCarats++;
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NextExternalChar++;
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}
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}
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/*
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* Determine the number of ACPI name "segments" by counting the number of
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* path separators within the string. Start with one segment since the
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* segment count is [(# separators) + 1], and zero separators is ok.
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*/
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if (*NextExternalChar)
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{
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Info->NumSegments = 1;
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for (i = 0; NextExternalChar[i]; i++)
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{
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if (ACPI_IS_PATH_SEPARATOR (NextExternalChar[i]))
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{
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Info->NumSegments++;
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}
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}
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}
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Info->Length = (ACPI_NAME_SIZE * Info->NumSegments) +
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4 + Info->NumCarats;
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Info->NextExternalChar = NextExternalChar;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsBuildInternalName
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*
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* PARAMETERS: Info - Info struct fully initialized
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*
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* RETURN: Status
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*
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* DESCRIPTION: Construct the internal (AML) namestring
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* corresponding to the external (ASL) namestring.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsBuildInternalName (
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ACPI_NAMESTRING_INFO *Info)
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{
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UINT32 NumSegments = Info->NumSegments;
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char *InternalName = Info->InternalName;
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const char *ExternalName = Info->NextExternalChar;
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char *Result = NULL;
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UINT32 i;
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ACPI_FUNCTION_TRACE (NsBuildInternalName);
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/* Setup the correct prefixes, counts, and pointers */
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if (Info->FullyQualified)
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{
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InternalName[0] = AML_ROOT_PREFIX;
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if (NumSegments <= 1)
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{
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Result = &InternalName[1];
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}
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else if (NumSegments == 2)
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{
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InternalName[1] = AML_DUAL_NAME_PREFIX;
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Result = &InternalName[2];
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}
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else
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{
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InternalName[1] = AML_MULTI_NAME_PREFIX_OP;
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InternalName[2] = (char) NumSegments;
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Result = &InternalName[3];
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}
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}
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else
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{
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/*
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* Not fully qualified.
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* Handle Carats first, then append the name segments
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*/
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i = 0;
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if (Info->NumCarats)
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{
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for (i = 0; i < Info->NumCarats; i++)
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{
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InternalName[i] = AML_PARENT_PREFIX;
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}
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}
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if (NumSegments <= 1)
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{
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Result = &InternalName[i];
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}
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else if (NumSegments == 2)
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{
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InternalName[i] = AML_DUAL_NAME_PREFIX;
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Result = &InternalName[(ACPI_SIZE) i+1];
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}
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else
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{
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InternalName[i] = AML_MULTI_NAME_PREFIX_OP;
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InternalName[(ACPI_SIZE) i+1] = (char) NumSegments;
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Result = &InternalName[(ACPI_SIZE) i+2];
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}
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}
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/* Build the name (minus path separators) */
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for (; NumSegments; NumSegments--)
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{
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for (i = 0; i < ACPI_NAME_SIZE; i++)
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{
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if (ACPI_IS_PATH_SEPARATOR (*ExternalName) ||
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(*ExternalName == 0))
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{
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/* Pad the segment with underscore(s) if segment is short */
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Result[i] = '_';
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}
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else
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{
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/* Convert the character to uppercase and save it */
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Result[i] = (char) ACPI_TOUPPER ((int) *ExternalName);
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ExternalName++;
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}
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}
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/* Now we must have a path separator, or the pathname is bad */
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if (!ACPI_IS_PATH_SEPARATOR (*ExternalName) &&
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(*ExternalName != 0))
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{
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return_ACPI_STATUS (AE_BAD_PATHNAME);
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}
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/* Move on the next segment */
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ExternalName++;
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Result += ACPI_NAME_SIZE;
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}
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/* Terminate the string */
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*Result = 0;
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if (Info->FullyQualified)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (abs) \"\\%s\"\n",
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InternalName, InternalName));
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}
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else
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
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InternalName, InternalName));
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}
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsInternalizeName
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*
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* PARAMETERS: *ExternalName - External representation of name
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* **Converted Name - Where to return the resulting
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* internal represention of the name
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*
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* RETURN: Status
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*
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* DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
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* to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
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*
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*******************************************************************************/
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ACPI_STATUS
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AcpiNsInternalizeName (
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const char *ExternalName,
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char **ConvertedName)
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{
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char *InternalName;
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ACPI_NAMESTRING_INFO Info;
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (NsInternalizeName);
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if ((!ExternalName) ||
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(*ExternalName == 0) ||
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(!ConvertedName))
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/* Get the length of the new internal name */
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Info.ExternalName = ExternalName;
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AcpiNsGetInternalNameLength (&Info);
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/* We need a segment to store the internal name */
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InternalName = ACPI_ALLOCATE_ZEROED (Info.Length);
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if (!InternalName)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/* Build the name */
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Info.InternalName = InternalName;
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Status = AcpiNsBuildInternalName (&Info);
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if (ACPI_FAILURE (Status))
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{
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ACPI_FREE (InternalName);
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return_ACPI_STATUS (Status);
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}
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*ConvertedName = InternalName;
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsExternalizeName
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*
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* PARAMETERS: InternalNameLength - Lenth of the internal name below
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* InternalName - Internal representation of name
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* ConvertedNameLength - Where the length is returned
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* ConvertedName - Where the resulting external name
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* is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
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* to its external (printable) form (e.g. "\_PR_.CPU0")
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsExternalizeName (
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UINT32 InternalNameLength,
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const char *InternalName,
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UINT32 *ConvertedNameLength,
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char **ConvertedName)
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{
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UINT32 NamesIndex = 0;
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UINT32 NumSegments = 0;
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UINT32 RequiredLength;
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UINT32 PrefixLength = 0;
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UINT32 i = 0;
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UINT32 j = 0;
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ACPI_FUNCTION_TRACE (NsExternalizeName);
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if (!InternalNameLength ||
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!InternalName ||
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!ConvertedName)
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/* Check for a prefix (one '\' | one or more '^') */
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switch (InternalName[0])
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{
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case AML_ROOT_PREFIX:
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PrefixLength = 1;
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break;
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case AML_PARENT_PREFIX:
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for (i = 0; i < InternalNameLength; i++)
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{
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if (ACPI_IS_PARENT_PREFIX (InternalName[i]))
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{
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PrefixLength = i + 1;
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}
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else
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{
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break;
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}
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}
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if (i == InternalNameLength)
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{
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PrefixLength = i;
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}
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break;
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default:
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break;
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}
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/*
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* Check for object names. Note that there could be 0-255 of these
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* 4-byte elements.
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*/
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if (PrefixLength < InternalNameLength)
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{
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switch (InternalName[PrefixLength])
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{
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case AML_MULTI_NAME_PREFIX_OP:
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/* <count> 4-byte names */
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NamesIndex = PrefixLength + 2;
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NumSegments = (UINT8)
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InternalName[(ACPI_SIZE) PrefixLength + 1];
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break;
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case AML_DUAL_NAME_PREFIX:
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/* Two 4-byte names */
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NamesIndex = PrefixLength + 1;
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NumSegments = 2;
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break;
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case 0:
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/* NullName */
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NamesIndex = 0;
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NumSegments = 0;
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break;
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default:
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/* one 4-byte name */
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NamesIndex = PrefixLength;
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NumSegments = 1;
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break;
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}
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}
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/*
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* Calculate the length of ConvertedName, which equals the length
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* of the prefix, length of all object names, length of any required
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* punctuation ('.') between object names, plus the NULL terminator.
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*/
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RequiredLength = PrefixLength + (4 * NumSegments) +
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((NumSegments > 0) ? (NumSegments - 1) : 0) + 1;
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/*
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* Check to see if we're still in bounds. If not, there's a problem
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* with InternalName (invalid format).
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*/
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if (RequiredLength > InternalNameLength)
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{
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ACPI_ERROR ((AE_INFO, "Invalid internal name"));
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return_ACPI_STATUS (AE_BAD_PATHNAME);
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}
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/* Build the ConvertedName */
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*ConvertedName = ACPI_ALLOCATE_ZEROED (RequiredLength);
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if (!(*ConvertedName))
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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j = 0;
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for (i = 0; i < PrefixLength; i++)
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{
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(*ConvertedName)[j++] = InternalName[i];
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}
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if (NumSegments > 0)
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{
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for (i = 0; i < NumSegments; i++)
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{
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if (i > 0)
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{
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(*ConvertedName)[j++] = '.';
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}
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/* Copy and validate the 4-char name segment */
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ACPI_MOVE_NAME (&(*ConvertedName)[j], &InternalName[NamesIndex]);
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AcpiUtRepairName (&(*ConvertedName)[j]);
|
|
|
|
j += ACPI_NAME_SIZE;
|
|
NamesIndex += ACPI_NAME_SIZE;
|
|
}
|
|
}
|
|
|
|
if (ConvertedNameLength)
|
|
{
|
|
*ConvertedNameLength = (UINT32) RequiredLength;
|
|
}
|
|
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiNsValidateHandle
|
|
*
|
|
* PARAMETERS: Handle - Handle to be validated and typecast to a
|
|
* namespace node.
|
|
*
|
|
* RETURN: A pointer to a namespace node
|
|
*
|
|
* DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
|
|
* cases for the root node.
|
|
*
|
|
* NOTE: Real integer handles would allow for more verification
|
|
* and keep all pointers within this subsystem - however this introduces
|
|
* more overhead and has not been necessary to this point. Drivers
|
|
* holding handles are typically notified before a node becomes invalid
|
|
* due to a table unload.
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_NAMESPACE_NODE *
|
|
AcpiNsValidateHandle (
|
|
ACPI_HANDLE Handle)
|
|
{
|
|
|
|
ACPI_FUNCTION_ENTRY ();
|
|
|
|
|
|
/* Parameter validation */
|
|
|
|
if ((!Handle) || (Handle == ACPI_ROOT_OBJECT))
|
|
{
|
|
return (AcpiGbl_RootNode);
|
|
}
|
|
|
|
/* We can at least attempt to verify the handle */
|
|
|
|
if (ACPI_GET_DESCRIPTOR_TYPE (Handle) != ACPI_DESC_TYPE_NAMED)
|
|
{
|
|
return (NULL);
|
|
}
|
|
|
|
return (ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Handle));
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiNsTerminate
|
|
*
|
|
* PARAMETERS: none
|
|
*
|
|
* RETURN: none
|
|
*
|
|
* DESCRIPTION: free memory allocated for namespace and ACPI table storage.
|
|
*
|
|
******************************************************************************/
|
|
|
|
void
|
|
AcpiNsTerminate (
|
|
void)
|
|
{
|
|
ACPI_STATUS Status;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE (NsTerminate);
|
|
|
|
|
|
/*
|
|
* Free the entire namespace -- all nodes and all objects
|
|
* attached to the nodes
|
|
*/
|
|
AcpiNsDeleteNamespaceSubtree (AcpiGbl_RootNode);
|
|
|
|
/* Delete any objects attached to the root node */
|
|
|
|
Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_VOID;
|
|
}
|
|
|
|
AcpiNsDeleteNode (AcpiGbl_RootNode);
|
|
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freed\n"));
|
|
return_VOID;
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiNsOpensScope
|
|
*
|
|
* PARAMETERS: Type - A valid namespace type
|
|
*
|
|
* RETURN: NEWSCOPE if the passed type "opens a name scope" according
|
|
* to the ACPI specification, else 0
|
|
*
|
|
******************************************************************************/
|
|
|
|
UINT32
|
|
AcpiNsOpensScope (
|
|
ACPI_OBJECT_TYPE Type)
|
|
{
|
|
ACPI_FUNCTION_ENTRY ();
|
|
|
|
|
|
if (Type > ACPI_TYPE_LOCAL_MAX)
|
|
{
|
|
/* type code out of range */
|
|
|
|
ACPI_WARNING ((AE_INFO, "Invalid Object Type 0x%X", Type));
|
|
return (ACPI_NS_NORMAL);
|
|
}
|
|
|
|
return (((UINT32) AcpiGbl_NsProperties[Type]) & ACPI_NS_NEWSCOPE);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiNsGetNode
|
|
*
|
|
* PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
|
|
* \ (backslash) and ^ (carat) prefixes, and the
|
|
* . (period) to separate segments are supported.
|
|
* PrefixNode - Root of subtree to be searched, or NS_ALL for the
|
|
* root of the name space. If Name is fully
|
|
* qualified (first INT8 is '\'), the passed value
|
|
* of Scope will not be accessed.
|
|
* Flags - Used to indicate whether to perform upsearch or
|
|
* not.
|
|
* ReturnNode - 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
|
|
AcpiNsGetNode (
|
|
ACPI_NAMESPACE_NODE *PrefixNode,
|
|
const char *Pathname,
|
|
UINT32 Flags,
|
|
ACPI_NAMESPACE_NODE **ReturnNode)
|
|
{
|
|
ACPI_GENERIC_STATE ScopeInfo;
|
|
ACPI_STATUS Status;
|
|
char *InternalPath;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE_PTR (NsGetNode, ACPI_CAST_PTR (char, Pathname));
|
|
|
|
|
|
/* Simplest case is a null pathname */
|
|
|
|
if (!Pathname)
|
|
{
|
|
*ReturnNode = PrefixNode;
|
|
if (!PrefixNode)
|
|
{
|
|
*ReturnNode = AcpiGbl_RootNode;
|
|
}
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
/* Quick check for a reference to the root */
|
|
|
|
if (ACPI_IS_ROOT_PREFIX (Pathname[0]) && (!Pathname[1]))
|
|
{
|
|
*ReturnNode = AcpiGbl_RootNode;
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
/* Convert path to internal representation */
|
|
|
|
Status = AcpiNsInternalizeName (Pathname, &InternalPath);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
/* Must lock namespace during lookup */
|
|
|
|
Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
goto Cleanup;
|
|
}
|
|
|
|
/* Setup lookup scope (search starting point) */
|
|
|
|
ScopeInfo.Scope.Node = PrefixNode;
|
|
|
|
/* Lookup the name in the namespace */
|
|
|
|
Status = AcpiNsLookup (&ScopeInfo, InternalPath, ACPI_TYPE_ANY,
|
|
ACPI_IMODE_EXECUTE, (Flags | ACPI_NS_DONT_OPEN_SCOPE),
|
|
NULL, ReturnNode);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s, %s\n",
|
|
Pathname, AcpiFormatException (Status)));
|
|
}
|
|
|
|
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
|
|
|
|
Cleanup:
|
|
ACPI_FREE (InternalPath);
|
|
return_ACPI_STATUS (Status);
|
|
}
|