712 lines
23 KiB
C
712 lines
23 KiB
C
/*******************************************************************************
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*
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* Module Name: nsaccess - Top-level functions for accessing ACPI namespace
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* $Revision: 135 $
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*
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******************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#define __NSACCESS_C__
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#include "acpi.h"
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#include "amlcode.h"
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#include "acinterp.h"
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#include "acnamesp.h"
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#include "acdispat.h"
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#define _COMPONENT ACPI_NAMESPACE
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MODULE_NAME ("nsaccess")
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsRootInitialize
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Allocate and initialize the default root named objects
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*
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* MUTEX: Locks namespace for entire execution
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsRootInitialize (void)
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{
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ACPI_STATUS Status = AE_OK;
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const PREDEFINED_NAMES *InitVal = NULL;
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ACPI_NAMESPACE_NODE *NewNode;
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ACPI_OPERAND_OBJECT *ObjDesc;
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FUNCTION_TRACE ("NsRootInitialize");
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AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
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/*
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* The global root ptr is initially NULL, so a non-NULL value indicates
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* that AcpiNsRootInitialize() has already been called; just return.
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*/
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if (AcpiGbl_RootNode)
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{
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Status = AE_OK;
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goto UnlockAndExit;
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}
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/*
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* Tell the rest of the subsystem that the root is initialized
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* (This is OK because the namespace is locked)
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*/
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AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct;
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/* Enter the pre-defined names in the name table */
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Entering predefined entries into namespace\n"));
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for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++)
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{
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Status = AcpiNsLookup (NULL, InitVal->Name, InitVal->Type,
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IMODE_LOAD_PASS2, NS_NO_UPSEARCH,
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NULL, &NewNode);
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if (ACPI_FAILURE (Status) || (!NewNode)) /* Must be on same line for code converter */
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Could not create predefined name %s, %s\n",
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InitVal->Name, AcpiFormatException (Status)));
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}
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/*
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* Name entered successfully.
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* If entry in PreDefinedNames[] specifies an
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* initial value, create the initial value.
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*/
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if (InitVal->Val)
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{
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/*
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* Entry requests an initial value, allocate a
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* descriptor for it.
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*/
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ObjDesc = AcpiUtCreateInternalObject (InitVal->Type);
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if (!ObjDesc)
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{
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Status = AE_NO_MEMORY;
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goto UnlockAndExit;
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}
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/*
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* Convert value string from table entry to
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* internal representation. Only types actually
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* used for initial values are implemented here.
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*/
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switch (InitVal->Type)
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{
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case ACPI_TYPE_INTEGER:
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ObjDesc->Integer.Value =
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(ACPI_INTEGER) STRTOUL (InitVal->Val, NULL, 10);
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break;
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case ACPI_TYPE_STRING:
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/*
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* Build an object around the static string
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*/
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ObjDesc->String.Length = STRLEN (InitVal->Val);
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ObjDesc->String.Pointer = InitVal->Val;
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ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER;
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break;
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case ACPI_TYPE_MUTEX:
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ObjDesc->Mutex.SyncLevel =
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(UINT16) STRTOUL (InitVal->Val, NULL, 10);
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if (STRCMP (InitVal->Name, "_GL_") == 0)
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{
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/*
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* Create a counting semaphore for the
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* global lock
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*/
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Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT,
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1, &ObjDesc->Mutex.Semaphore);
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if (ACPI_FAILURE (Status))
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{
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goto UnlockAndExit;
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}
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/*
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* We just created the mutex for the
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* global lock, save it
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*/
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AcpiGbl_GlobalLockSemaphore = ObjDesc->Mutex.Semaphore;
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}
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else
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{
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/* Create a mutex */
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Status = AcpiOsCreateSemaphore (1, 1,
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&ObjDesc->Mutex.Semaphore);
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if (ACPI_FAILURE (Status))
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{
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goto UnlockAndExit;
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}
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}
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break;
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default:
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REPORT_ERROR (("Unsupported initial type value %X\n",
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InitVal->Type));
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AcpiUtRemoveReference (ObjDesc);
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ObjDesc = NULL;
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continue;
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}
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/* Store pointer to value descriptor in the Node */
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AcpiNsAttachObject (NewNode, ObjDesc, ObjDesc->Common.Type);
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/* Remove local reference to the object */
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AcpiUtRemoveReference (ObjDesc);
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}
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}
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UnlockAndExit:
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AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsLookup
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*
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* PARAMETERS: PrefixNode - Search scope if name is not fully qualified
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* Pathname - Search pathname, in internal format
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* (as represented in the AML stream)
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* Type - Type associated with name
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* InterpreterMode - IMODE_LOAD_PASS2 => add name if not found
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* Flags - Flags describing the search restrictions
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* WalkState - Current state of the walk
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* ReturnNode - Where the Node is placed (if found
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* or created successfully)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Find or enter the passed name in the name space.
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* Log an error if name not found in Exec mode.
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*
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* MUTEX: Assumes namespace is locked.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsLookup (
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ACPI_GENERIC_STATE *ScopeInfo,
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NATIVE_CHAR *Pathname,
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ACPI_OBJECT_TYPE8 Type,
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OPERATING_MODE InterpreterMode,
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UINT32 Flags,
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ACPI_WALK_STATE *WalkState,
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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 *PrefixNode;
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ACPI_NAMESPACE_NODE *CurrentNode = NULL;
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ACPI_NAMESPACE_NODE *ScopeToPush = NULL;
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ACPI_NAMESPACE_NODE *ThisNode = NULL;
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UINT32 NumSegments;
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ACPI_NAME SimpleName;
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BOOLEAN NullNamePath = FALSE;
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ACPI_OBJECT_TYPE8 TypeToCheckFor;
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ACPI_OBJECT_TYPE8 ThisSearchType;
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UINT32 LocalFlags = Flags & ~NS_ERROR_IF_FOUND;
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DEBUG_EXEC (UINT32 i;)
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FUNCTION_TRACE ("NsLookup");
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if (!ReturnNode)
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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AcpiGbl_NsLookupCount++;
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*ReturnNode = ENTRY_NOT_FOUND;
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if (!AcpiGbl_RootNode)
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{
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return (AE_NO_NAMESPACE);
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}
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/*
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* Get the prefix scope.
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* A null scope means use the root scope
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*/
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if ((!ScopeInfo) ||
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(!ScopeInfo->Scope.Node))
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Null scope prefix, using root node (%p)\n",
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AcpiGbl_RootNode));
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PrefixNode = AcpiGbl_RootNode;
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}
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else
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{
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PrefixNode = ScopeInfo->Scope.Node;
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}
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/*
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* This check is explicitly split to relax the TypeToCheckFor
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* conditions for BankFieldDefn. Originally, both BankFieldDefn and
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* DefFieldDefn caused TypeToCheckFor to be set to ACPI_TYPE_REGION,
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* but the BankFieldDefn may also check for a Field definition as well
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* as an OperationRegion.
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*/
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if (INTERNAL_TYPE_FIELD_DEFN == Type)
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{
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/* DefFieldDefn defines fields in a Region */
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TypeToCheckFor = ACPI_TYPE_REGION;
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}
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else if (INTERNAL_TYPE_BANK_FIELD_DEFN == Type)
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{
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/* BankFieldDefn defines data fields in a Field Object */
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TypeToCheckFor = ACPI_TYPE_ANY;
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}
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else
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{
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TypeToCheckFor = Type;
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}
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/* TBD: [Restructure] - Move the pathname stuff into a new procedure */
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/* Examine the name pointer */
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if (!Pathname)
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{
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/* 8-12-98 ASL Grammar Update supports null NamePath */
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NullNamePath = TRUE;
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NumSegments = 0;
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ThisNode = AcpiGbl_RootNode;
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Null Pathname (Zero segments), Flags=%x\n", Flags));
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}
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else
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{
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/*
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* Valid name pointer (Internal name format)
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*
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* Check for prefixes. As represented in the AML stream, a
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* Pathname consists of an optional scope prefix followed by
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* a segment part.
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*
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* If present, the scope prefix is either a RootPrefix (in
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* which case the name is fully qualified), or zero or more
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* ParentPrefixes (in which case the name's scope is relative
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* to the current scope).
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*
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* The segment part consists of either:
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* - A single 4-byte name segment, or
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* - A DualNamePrefix followed by two 4-byte name segments, or
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* - A MultiNamePrefixOp, followed by a byte indicating the
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* number of segments and the segments themselves.
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*/
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if (*Pathname == AML_ROOT_PREFIX)
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{
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/* Pathname is fully qualified, look in root name table */
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CurrentNode = AcpiGbl_RootNode;
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/* point to segment part */
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Pathname++;
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Searching from root [%p]\n",
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CurrentNode));
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/* Direct reference to root, "\" */
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if (!(*Pathname))
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{
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ThisNode = AcpiGbl_RootNode;
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goto CheckForNewScopeAndExit;
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}
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}
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else
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{
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/* Pathname is relative to current scope, start there */
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CurrentNode = PrefixNode;
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Searching relative to pfx scope [%p]\n",
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PrefixNode));
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/*
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* Handle up-prefix (carat). More than one prefix
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* is supported
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*/
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while (*Pathname == AML_PARENT_PREFIX)
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{
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/* Point to segment part or next ParentPrefix */
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Pathname++;
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/* Backup to the parent's scope */
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ThisNode = AcpiNsGetParentObject (CurrentNode);
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if (!ThisNode)
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{
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/* Current scope has no parent scope */
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REPORT_ERROR (
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("Too many parent prefixes (^) - reached root\n"));
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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CurrentNode = ThisNode;
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}
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}
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/*
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* Examine the name prefix opcode, if any,
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* to determine the number of segments
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*/
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if (*Pathname == AML_DUAL_NAME_PREFIX)
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{
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NumSegments = 2;
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/* point to first segment */
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Pathname++;
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Dual Pathname (2 segments, Flags=%X)\n", Flags));
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}
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else if (*Pathname == AML_MULTI_NAME_PREFIX_OP)
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{
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NumSegments = (UINT32)* (UINT8 *) ++Pathname;
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/* point to first segment */
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Pathname++;
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Multi Pathname (%d Segments, Flags=%X) \n",
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NumSegments, Flags));
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}
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else
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{
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/*
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* No Dual or Multi prefix, hence there is only one
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* segment and Pathname is already pointing to it.
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*/
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NumSegments = 1;
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Simple Pathname (1 segment, Flags=%X)\n", Flags));
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}
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#ifdef ACPI_DEBUG
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/* TBD: [Restructure] Make this a procedure */
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/* Debug only: print the entire name that we are about to lookup */
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "["));
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|
for (i = 0; i < NumSegments; i++)
|
|
{
|
|
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_NAMES, "%4.4s/", (char*)&Pathname[i * 4]));
|
|
}
|
|
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_NAMES, "]\n"));
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* Search namespace for each segment of the name.
|
|
* Loop through and verify/add each name segment.
|
|
*/
|
|
while (NumSegments-- && CurrentNode)
|
|
{
|
|
/*
|
|
* Search for the current name segment under the current
|
|
* named object. The Type is significant only at the last (topmost)
|
|
* level. (We don't care about the types along the path, only
|
|
* the type of the final target object.)
|
|
*/
|
|
ThisSearchType = ACPI_TYPE_ANY;
|
|
if (!NumSegments)
|
|
{
|
|
ThisSearchType = Type;
|
|
LocalFlags = Flags;
|
|
}
|
|
|
|
/* Pluck one ACPI name from the front of the pathname */
|
|
|
|
MOVE_UNALIGNED32_TO_32 (&SimpleName, Pathname);
|
|
|
|
/* Try to find the ACPI name */
|
|
|
|
Status = AcpiNsSearchAndEnter (SimpleName, WalkState,
|
|
CurrentNode, InterpreterMode,
|
|
ThisSearchType, LocalFlags,
|
|
&ThisNode);
|
|
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
if (Status == AE_NOT_FOUND)
|
|
{
|
|
/* Name not found in ACPI namespace */
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
|
|
"Name [%4.4s] not found in scope %p\n",
|
|
(char*)&SimpleName, CurrentNode));
|
|
}
|
|
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
|
|
/*
|
|
* If 1) This is the last segment (NumSegments == 0)
|
|
* 2) and looking for a specific type
|
|
* (Not checking for TYPE_ANY)
|
|
* 3) Which is not an alias
|
|
* 4) which is not a local type (TYPE_DEF_ANY)
|
|
* 5) which is not a local type (TYPE_SCOPE)
|
|
* 6) which is not a local type (TYPE_INDEX_FIELD_DEFN)
|
|
* 7) and type of object is known (not TYPE_ANY)
|
|
* 8) and object does not match request
|
|
*
|
|
* Then we have a type mismatch. Just warn and ignore it.
|
|
*/
|
|
if ((NumSegments == 0) &&
|
|
(TypeToCheckFor != ACPI_TYPE_ANY) &&
|
|
(TypeToCheckFor != INTERNAL_TYPE_ALIAS) &&
|
|
(TypeToCheckFor != INTERNAL_TYPE_DEF_ANY) &&
|
|
(TypeToCheckFor != INTERNAL_TYPE_SCOPE) &&
|
|
(TypeToCheckFor != INTERNAL_TYPE_INDEX_FIELD_DEFN) &&
|
|
(ThisNode->Type != ACPI_TYPE_ANY) &&
|
|
(ThisNode->Type != TypeToCheckFor))
|
|
{
|
|
/* Complain about a type mismatch */
|
|
|
|
REPORT_WARNING (
|
|
("NsLookup: %4.4s, type %X, checking for type %X\n",
|
|
(char*)&SimpleName, ThisNode->Type, TypeToCheckFor));
|
|
}
|
|
|
|
/*
|
|
* If this is the last name segment and we are not looking for a
|
|
* specific type, but the type of found object is known, use that type
|
|
* to see if it opens a scope.
|
|
*/
|
|
if ((0 == NumSegments) && (ACPI_TYPE_ANY == Type))
|
|
{
|
|
Type = ThisNode->Type;
|
|
}
|
|
|
|
if ((NumSegments || AcpiNsOpensScope (Type)) &&
|
|
(ThisNode->Child == NULL))
|
|
{
|
|
/*
|
|
* More segments or the type implies enclosed scope,
|
|
* and the next scope has not been allocated.
|
|
*/
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Load mode=%X ThisNode=%p\n",
|
|
InterpreterMode, ThisNode));
|
|
}
|
|
|
|
CurrentNode = ThisNode;
|
|
|
|
/* point to next name segment */
|
|
|
|
Pathname += ACPI_NAME_SIZE;
|
|
}
|
|
|
|
|
|
/*
|
|
* Always check if we need to open a new scope
|
|
*/
|
|
CheckForNewScopeAndExit:
|
|
|
|
if (!(Flags & NS_DONT_OPEN_SCOPE) && (WalkState))
|
|
{
|
|
/*
|
|
* If entry is a type which opens a scope,
|
|
* push the new scope on the scope stack.
|
|
*/
|
|
if (AcpiNsOpensScope (TypeToCheckFor))
|
|
{
|
|
/* 8-12-98 ASL Grammar Update supports null NamePath */
|
|
|
|
if (NullNamePath)
|
|
{
|
|
/* TBD: [Investigate] - is this the correct thing to do? */
|
|
|
|
ScopeToPush = NULL;
|
|
}
|
|
else
|
|
{
|
|
ScopeToPush = ThisNode;
|
|
}
|
|
|
|
Status = AcpiDsScopeStackPush (ScopeToPush, Type,
|
|
WalkState);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Set global scope to %p\n", ScopeToPush));
|
|
}
|
|
}
|
|
|
|
*ReturnNode = ThisNode;
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|