forked from Imagelibrary/rtems
336 lines
13 KiB
C
336 lines
13 KiB
C
/******************************************************************************
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*
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* Module Name: utcksum - Support generating table checksums
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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 - 2024, 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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*
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* Alternatively, you may choose to be licensed under the terms of the
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* following license:
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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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* 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 MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, you may choose to be licensed 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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*****************************************************************************/
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#include "acpi.h"
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#include "accommon.h"
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#include "acdisasm.h"
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#include "acutils.h"
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/* This module used for application-level code only */
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#define _COMPONENT ACPI_CA_DISASSEMBLER
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ACPI_MODULE_NAME ("utcksum")
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtVerifyChecksum
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*
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* PARAMETERS: Table - ACPI table to verify
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* Length - Length of entire table
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*
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* RETURN: Status
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*
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* DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
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* exception on bad checksum.
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* Note: We don't have to check for a CDAT here, since CDAT is
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* not in the RSDT/XSDT, and the CDAT table is never installed
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* via ACPICA.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiUtVerifyChecksum (
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ACPI_TABLE_HEADER *Table,
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UINT32 Length)
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{
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UINT8 Checksum;
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/*
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* FACS/S3PT:
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* They are the odd tables, have no standard ACPI header and no checksum
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*/
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if (ACPI_COMPARE_NAMESEG (Table->Signature, ACPI_SIG_S3PT) ||
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ACPI_COMPARE_NAMESEG (Table->Signature, ACPI_SIG_FACS))
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{
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return (AE_OK);
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}
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/* Compute the checksum on the table */
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Length = Table->Length;
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Checksum = AcpiUtGenerateChecksum (ACPI_CAST_PTR (UINT8, Table), Length, Table->Checksum);
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/* Computed checksum matches table? */
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if (Checksum != Table->Checksum)
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{
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ACPI_BIOS_WARNING ((AE_INFO,
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"Incorrect checksum in table [%4.4s] - 0x%2.2X, "
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"should be 0x%2.2X",
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Table->Signature, Table->Checksum,
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Table->Checksum - Checksum));
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#if (ACPI_CHECKSUM_ABORT)
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return (AE_BAD_CHECKSUM);
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#endif
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtVerifyCdatChecksum
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*
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* PARAMETERS: Table - CDAT ACPI table to verify
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* Length - Length of entire table
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*
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* RETURN: Status
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*
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* DESCRIPTION: Verifies that the CDAT table checksums to zero. Optionally
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* returns an exception on bad checksum.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiUtVerifyCdatChecksum (
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ACPI_TABLE_CDAT *CdatTable,
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UINT32 Length)
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{
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UINT8 Checksum;
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/* Compute the checksum on the table */
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Checksum = AcpiUtGenerateChecksum (ACPI_CAST_PTR (UINT8, CdatTable),
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CdatTable->Length, CdatTable->Checksum);
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/* Computed checksum matches table? */
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if (Checksum != CdatTable->Checksum)
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{
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ACPI_BIOS_WARNING ((AE_INFO,
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"Incorrect checksum in table [%4.4s] - 0x%2.2X, "
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"should be 0x%2.2X",
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AcpiGbl_CDAT, CdatTable->Checksum, Checksum));
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#if (ACPI_CHECKSUM_ABORT)
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return (AE_BAD_CHECKSUM);
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#endif
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}
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CdatTable->Checksum = Checksum;
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtGenerateChecksum
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*
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* PARAMETERS: Table - Pointer to table to be checksummed
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* Length - Length of the table
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* OriginalChecksum - Value of the checksum field
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*
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* RETURN: 8 bit checksum of buffer
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*
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* DESCRIPTION: Computes an 8 bit checksum of the table.
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*
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******************************************************************************/
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UINT8
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AcpiUtGenerateChecksum (
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void *Table,
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UINT32 Length,
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UINT8 OriginalChecksum)
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{
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UINT8 Checksum;
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/* Sum the entire table as-is */
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Checksum = AcpiUtChecksum ((UINT8 *) Table, Length);
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/* Subtract off the existing checksum value in the table */
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Checksum = (UINT8) (Checksum - OriginalChecksum);
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/* Compute and return the final checksum */
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Checksum = (UINT8) (0 - Checksum);
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return (Checksum);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtChecksum
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*
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* PARAMETERS: Buffer - Pointer to memory region to be checked
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* Length - Length of this memory region
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*
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* RETURN: Checksum (UINT8)
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*
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* DESCRIPTION: Calculates circular checksum of memory region.
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*
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******************************************************************************/
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UINT8
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AcpiUtChecksum (
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UINT8 *Buffer,
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UINT32 Length)
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{
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UINT8 Sum = 0;
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UINT8 *End = Buffer + Length;
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while (Buffer < End)
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{
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Sum = (UINT8) (Sum + *(Buffer++));
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}
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return (Sum);
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}
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