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785 lines
24 KiB
C
785 lines
24 KiB
C
/******************************************************************************
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*
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* Module Name: tbxface - Public interfaces to the ACPI subsystem
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* ACPI table oriented interfaces
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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 - 2011, 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 __TBXFACE_C__
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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 "actables.h"
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME ("tbxface")
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/* Local prototypes */
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static ACPI_STATUS
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AcpiTbLoadNamespace (
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void);
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/*******************************************************************************
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*
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* FUNCTION: AcpiAllocateRootTable
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*
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* PARAMETERS: InitialTableCount - Size of InitialTableArray, in number of
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* ACPI_TABLE_DESC structures
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*
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* RETURN: Status
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*
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* DESCRIPTION: Allocate a root table array. Used by iASL compiler and
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* AcpiInitializeTables.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiAllocateRootTable (
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UINT32 InitialTableCount)
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{
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AcpiGbl_RootTableList.MaxTableCount = InitialTableCount;
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AcpiGbl_RootTableList.Flags = ACPI_ROOT_ALLOW_RESIZE;
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return (AcpiTbResizeRootTableList ());
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiInitializeTables
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*
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* PARAMETERS: InitialTableArray - Pointer to an array of pre-allocated
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* ACPI_TABLE_DESC structures. If NULL, the
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* array is dynamically allocated.
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* InitialTableCount - Size of InitialTableArray, in number of
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* ACPI_TABLE_DESC structures
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* AllowRealloc - Flag to tell Table Manager if resize of
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* pre-allocated array is allowed. Ignored
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* if InitialTableArray is NULL.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
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*
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* NOTE: Allows static allocation of the initial table array in order
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* to avoid the use of dynamic memory in confined environments
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* such as the kernel boot sequence where it may not be available.
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*
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* If the host OS memory managers are initialized, use NULL for
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* InitialTableArray, and the table will be dynamically allocated.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiInitializeTables (
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ACPI_TABLE_DESC *InitialTableArray,
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UINT32 InitialTableCount,
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BOOLEAN AllowResize)
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{
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ACPI_PHYSICAL_ADDRESS RsdpAddress;
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (AcpiInitializeTables);
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/*
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* Set up the Root Table Array
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* Allocate the table array if requested
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*/
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if (!InitialTableArray)
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{
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Status = AcpiAllocateRootTable (InitialTableCount);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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}
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else
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{
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/* Root Table Array has been statically allocated by the host */
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ACPI_MEMSET (InitialTableArray, 0,
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(ACPI_SIZE) InitialTableCount * sizeof (ACPI_TABLE_DESC));
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AcpiGbl_RootTableList.Tables = InitialTableArray;
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AcpiGbl_RootTableList.MaxTableCount = InitialTableCount;
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AcpiGbl_RootTableList.Flags = ACPI_ROOT_ORIGIN_UNKNOWN;
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if (AllowResize)
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{
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AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ALLOW_RESIZE;
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}
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}
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/* Get the address of the RSDP */
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RsdpAddress = AcpiOsGetRootPointer ();
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if (!RsdpAddress)
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{
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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/*
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* Get the root table (RSDT or XSDT) and extract all entries to the local
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* Root Table Array. This array contains the information of the RSDT/XSDT
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* in a common, more useable format.
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*/
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Status = AcpiTbParseRootTable (RsdpAddress);
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return_ACPI_STATUS (Status);
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}
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ACPI_EXPORT_SYMBOL (AcpiInitializeTables)
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/*******************************************************************************
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*
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* FUNCTION: AcpiReallocateRootTable
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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: Reallocate Root Table List into dynamic memory. Copies the
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* root list from the previously provided scratch area. Should
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* be called once dynamic memory allocation is available in the
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* kernel
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiReallocateRootTable (
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void)
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{
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ACPI_TABLE_DESC *Tables;
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ACPI_SIZE NewSize;
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ACPI_SIZE CurrentSize;
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ACPI_FUNCTION_TRACE (AcpiReallocateRootTable);
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/*
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* Only reallocate the root table if the host provided a static buffer
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* for the table array in the call to AcpiInitializeTables.
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*/
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if (AcpiGbl_RootTableList.Flags & ACPI_ROOT_ORIGIN_ALLOCATED)
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{
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return_ACPI_STATUS (AE_SUPPORT);
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}
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/*
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* Get the current size of the root table and add the default
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* increment to create the new table size.
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*/
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CurrentSize = (ACPI_SIZE)
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AcpiGbl_RootTableList.CurrentTableCount * sizeof (ACPI_TABLE_DESC);
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NewSize = CurrentSize +
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(ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof (ACPI_TABLE_DESC));
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/* Create new array and copy the old array */
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Tables = ACPI_ALLOCATE_ZEROED (NewSize);
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if (!Tables)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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ACPI_MEMCPY (Tables, AcpiGbl_RootTableList.Tables, CurrentSize);
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/*
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* Update the root table descriptor. The new size will be the current
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* number of tables plus the increment, independent of the reserved
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* size of the original table list.
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*/
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AcpiGbl_RootTableList.Tables = Tables;
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AcpiGbl_RootTableList.MaxTableCount =
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AcpiGbl_RootTableList.CurrentTableCount + ACPI_ROOT_TABLE_SIZE_INCREMENT;
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AcpiGbl_RootTableList.Flags =
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ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
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return_ACPI_STATUS (AE_OK);
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}
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ACPI_EXPORT_SYMBOL (AcpiReallocateRootTable)
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/*******************************************************************************
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*
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* FUNCTION: AcpiGetTableHeader
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*
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* PARAMETERS: Signature - ACPI signature of needed table
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* Instance - Which instance (for SSDTs)
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* OutTableHeader - The pointer to the table header to fill
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*
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* RETURN: Status and pointer to mapped table header
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*
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* DESCRIPTION: Finds an ACPI table header.
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*
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* NOTE: Caller is responsible in unmapping the header with
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* AcpiOsUnmapMemory
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiGetTableHeader (
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char *Signature,
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UINT32 Instance,
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ACPI_TABLE_HEADER *OutTableHeader)
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{
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UINT32 i;
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UINT32 j;
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ACPI_TABLE_HEADER *Header;
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/* Parameter validation */
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if (!Signature || !OutTableHeader)
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{
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return (AE_BAD_PARAMETER);
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}
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/* Walk the root table list */
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for (i = 0, j = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
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{
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if (!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
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Signature))
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{
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continue;
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}
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if (++j < Instance)
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{
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continue;
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}
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if (!AcpiGbl_RootTableList.Tables[i].Pointer)
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{
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if ((AcpiGbl_RootTableList.Tables[i].Flags &
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ACPI_TABLE_ORIGIN_MASK) ==
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ACPI_TABLE_ORIGIN_MAPPED)
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{
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Header = AcpiOsMapMemory (
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AcpiGbl_RootTableList.Tables[i].Address,
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sizeof (ACPI_TABLE_HEADER));
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if (!Header)
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{
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return AE_NO_MEMORY;
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}
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ACPI_MEMCPY (OutTableHeader, Header, sizeof(ACPI_TABLE_HEADER));
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AcpiOsUnmapMemory (Header, sizeof(ACPI_TABLE_HEADER));
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}
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else
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{
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return AE_NOT_FOUND;
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}
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}
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else
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{
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ACPI_MEMCPY (OutTableHeader,
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AcpiGbl_RootTableList.Tables[i].Pointer,
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sizeof(ACPI_TABLE_HEADER));
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}
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return (AE_OK);
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}
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return (AE_NOT_FOUND);
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}
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ACPI_EXPORT_SYMBOL (AcpiGetTableHeader)
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/*******************************************************************************
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*
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* FUNCTION: AcpiGetTable
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*
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* PARAMETERS: Signature - ACPI signature of needed table
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* Instance - Which instance (for SSDTs)
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* OutTable - Where the pointer to the table is returned
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*
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* RETURN: Status and pointer to table
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*
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* DESCRIPTION: Finds and verifies an ACPI table.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiGetTable (
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char *Signature,
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UINT32 Instance,
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ACPI_TABLE_HEADER **OutTable)
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{
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UINT32 i;
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UINT32 j;
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ACPI_STATUS Status;
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/* Parameter validation */
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if (!Signature || !OutTable)
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{
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return (AE_BAD_PARAMETER);
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}
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/* Walk the root table list */
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for (i = 0, j = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
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{
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if (!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
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Signature))
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{
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continue;
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}
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if (++j < Instance)
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{
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continue;
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}
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Status = AcpiTbVerifyTable (&AcpiGbl_RootTableList.Tables[i]);
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if (ACPI_SUCCESS (Status))
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{
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*OutTable = AcpiGbl_RootTableList.Tables[i].Pointer;
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}
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return (Status);
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}
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return (AE_NOT_FOUND);
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}
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ACPI_EXPORT_SYMBOL (AcpiGetTable)
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/*******************************************************************************
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*
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* FUNCTION: AcpiGetTableByIndex
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*
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* PARAMETERS: TableIndex - Table index
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* Table - Where the pointer to the table is returned
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*
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* RETURN: Status and pointer to the table
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*
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* DESCRIPTION: Obtain a table by an index into the global table list.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiGetTableByIndex (
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UINT32 TableIndex,
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ACPI_TABLE_HEADER **Table)
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{
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (AcpiGetTableByIndex);
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/* Parameter validation */
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if (!Table)
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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(void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
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/* Validate index */
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if (TableIndex >= AcpiGbl_RootTableList.CurrentTableCount)
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{
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(void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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if (!AcpiGbl_RootTableList.Tables[TableIndex].Pointer)
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{
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/* Table is not mapped, map it */
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Status = AcpiTbVerifyTable (&AcpiGbl_RootTableList.Tables[TableIndex]);
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if (ACPI_FAILURE (Status))
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{
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(void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
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return_ACPI_STATUS (Status);
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}
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}
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*Table = AcpiGbl_RootTableList.Tables[TableIndex].Pointer;
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(void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
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return_ACPI_STATUS (AE_OK);
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}
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ACPI_EXPORT_SYMBOL (AcpiGetTableByIndex)
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbLoadNamespace
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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: Load the namespace from the DSDT and all SSDTs/PSDTs found in
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* the RSDT/XSDT.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiTbLoadNamespace (
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void)
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{
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ACPI_STATUS Status;
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UINT32 i;
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ACPI_TABLE_HEADER *NewDsdt;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE (TbLoadNamespace);
|
|
|
|
|
|
(void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
|
|
|
|
/*
|
|
* Load the namespace. The DSDT is required, but any SSDT and
|
|
* PSDT tables are optional. Verify the DSDT.
|
|
*/
|
|
if (!AcpiGbl_RootTableList.CurrentTableCount ||
|
|
!ACPI_COMPARE_NAME (
|
|
&(AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Signature),
|
|
ACPI_SIG_DSDT) ||
|
|
ACPI_FAILURE (AcpiTbVerifyTable (
|
|
&AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT])))
|
|
{
|
|
Status = AE_NO_ACPI_TABLES;
|
|
goto UnlockAndExit;
|
|
}
|
|
|
|
/*
|
|
* Save the DSDT pointer for simple access. This is the mapped memory
|
|
* address. We must take care here because the address of the .Tables
|
|
* array can change dynamically as tables are loaded at run-time. Note:
|
|
* .Pointer field is not validated until after call to AcpiTbVerifyTable.
|
|
*/
|
|
AcpiGbl_DSDT = AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Pointer;
|
|
|
|
/*
|
|
* Optionally copy the entire DSDT to local memory (instead of simply
|
|
* mapping it.) There are some BIOSs that corrupt or replace the original
|
|
* DSDT, creating the need for this option. Default is FALSE, do not copy
|
|
* the DSDT.
|
|
*/
|
|
if (AcpiGbl_CopyDsdtLocally)
|
|
{
|
|
NewDsdt = AcpiTbCopyDsdt (ACPI_TABLE_INDEX_DSDT);
|
|
if (NewDsdt)
|
|
{
|
|
AcpiGbl_DSDT = NewDsdt;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Save the original DSDT header for detection of table corruption
|
|
* and/or replacement of the DSDT from outside the OS.
|
|
*/
|
|
ACPI_MEMCPY (&AcpiGbl_OriginalDsdtHeader, AcpiGbl_DSDT,
|
|
sizeof (ACPI_TABLE_HEADER));
|
|
|
|
(void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
|
|
|
|
/* Load and parse tables */
|
|
|
|
Status = AcpiNsLoadTable (ACPI_TABLE_INDEX_DSDT, AcpiGbl_RootNode);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
/* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
|
|
|
|
(void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
|
|
for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
|
|
{
|
|
if ((!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
|
|
ACPI_SIG_SSDT) &&
|
|
!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
|
|
ACPI_SIG_PSDT)) ||
|
|
ACPI_FAILURE (AcpiTbVerifyTable (
|
|
&AcpiGbl_RootTableList.Tables[i])))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
/* Ignore errors while loading tables, get as many as possible */
|
|
|
|
(void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
|
|
(void) AcpiNsLoadTable (i, AcpiGbl_RootNode);
|
|
(void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
|
|
|
|
UnlockAndExit:
|
|
(void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiLoadTables
|
|
*
|
|
* PARAMETERS: None
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiLoadTables (
|
|
void)
|
|
{
|
|
ACPI_STATUS Status;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE (AcpiLoadTables);
|
|
|
|
|
|
/* Load the namespace from the tables */
|
|
|
|
Status = AcpiTbLoadNamespace ();
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
ACPI_EXCEPTION ((AE_INFO, Status,
|
|
"While loading namespace from ACPI tables"));
|
|
}
|
|
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
ACPI_EXPORT_SYMBOL (AcpiLoadTables)
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiInstallTableHandler
|
|
*
|
|
* PARAMETERS: Handler - Table event handler
|
|
* Context - Value passed to the handler on each event
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Install table event handler
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiInstallTableHandler (
|
|
ACPI_TABLE_HANDLER Handler,
|
|
void *Context)
|
|
{
|
|
ACPI_STATUS Status;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE (AcpiInstallTableHandler);
|
|
|
|
|
|
if (!Handler)
|
|
{
|
|
return_ACPI_STATUS (AE_BAD_PARAMETER);
|
|
}
|
|
|
|
Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
/* Don't allow more than one handler */
|
|
|
|
if (AcpiGbl_TableHandler)
|
|
{
|
|
Status = AE_ALREADY_EXISTS;
|
|
goto Cleanup;
|
|
}
|
|
|
|
/* Install the handler */
|
|
|
|
AcpiGbl_TableHandler = Handler;
|
|
AcpiGbl_TableHandlerContext = Context;
|
|
|
|
Cleanup:
|
|
(void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
ACPI_EXPORT_SYMBOL (AcpiInstallTableHandler)
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiRemoveTableHandler
|
|
*
|
|
* PARAMETERS: Handler - Table event handler that was installed
|
|
* previously.
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Remove table event handler
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiRemoveTableHandler (
|
|
ACPI_TABLE_HANDLER Handler)
|
|
{
|
|
ACPI_STATUS Status;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE (AcpiRemoveTableHandler);
|
|
|
|
|
|
Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
/* Make sure that the installed handler is the same */
|
|
|
|
if (!Handler ||
|
|
Handler != AcpiGbl_TableHandler)
|
|
{
|
|
Status = AE_BAD_PARAMETER;
|
|
goto Cleanup;
|
|
}
|
|
|
|
/* Remove the handler */
|
|
|
|
AcpiGbl_TableHandler = NULL;
|
|
|
|
Cleanup:
|
|
(void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
ACPI_EXPORT_SYMBOL (AcpiRemoveTableHandler)
|
|
|