FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/executer/exstorob.c

     /******************************************************************************
      *
      * Module Name: exstorob - AML object store support, store to object
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, Intel Corp.
     * All rights reserved.
     *
     * 2. License
     *
     * 2.1. This is your license from Intel Corp. under its intellectual property
     * rights. You may have additional license terms from the party that provided
     * you this software, covering your right to use that party's intellectual
     * property rights.
     *
     * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
     * copy of the source code appearing in this file ("Covered Code") an
     * irrevocable, perpetual, worldwide license under Intel's copyrights in the
     * base code distributed originally by Intel ("Original Intel Code") to copy,
     * make derivatives, distribute, use and display any portion of the Covered
     * Code in any form, with the right to sublicense such rights; and
     *
     * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
     * license (with the right to sublicense), under only those claims of Intel
     * patents that are infringed by the Original Intel Code, to make, use, sell,
     * offer to sell, and import the Covered Code and derivative works thereof
     * solely to the minimum extent necessary to exercise the above copyright
     * license, and in no event shall the patent license extend to any additions
     * to or modifications of the Original Intel Code. No other license or right
     * is granted directly or by implication, estoppel or otherwise;
     *
     * The above copyright and patent license is granted only if the following
     * conditions are met:
     *
     * 3. Conditions
     *
     * 3.1. Redistribution of Source with Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification with rights to further distribute source must include
     * the above Copyright Notice, the above License, this list of Conditions,
     * and the following Disclaimer and Export Compliance provision. In addition,
     * Licensee must cause all Covered Code to which Licensee contributes to
     * contain a file documenting the changes Licensee made to create that Covered
     * Code and the date of any change. Licensee must include in that file the
     * documentation of any changes made by any predecessor Licensee. Licensee
     * must include a prominent statement that the modification is derived,
     * directly or indirectly, from Original Intel Code.
     *
     * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification without rights to further distribute source must
     * include the following Disclaimer and Export Compliance provision in the
     * documentation and/or other materials provided with distribution. In
     * addition, Licensee may not authorize further sublicense of source of any
     * portion of the Covered Code, and must include terms to the effect that the
     * license from Licensee to its licensee is limited to the intellectual
     * property embodied in the software Licensee provides to its licensee, and
     * not to intellectual property embodied in modifications its licensee may
     * make.
     *
     * 3.3. Redistribution of Executable. Redistribution in executable form of any
     * substantial portion of the Covered Code or modification must reproduce the
     * above Copyright Notice, and the following Disclaimer and Export Compliance
     * provision in the documentation and/or other materials provided with the
     * distribution.
     *
     * 3.4. Intel retains all right, title, and interest in and to the Original
     * Intel Code.
     *
     * 3.5. Neither the name Intel nor any other trademark owned or controlled by
     * Intel shall be used in advertising or otherwise to promote the sale, use or
     * other dealings in products derived from or relating to the Covered Code
     * without prior written authorization from Intel.
     *
     * 4. Disclaimer and Export Compliance
     *
     * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
     * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
     * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
     * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
     * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
     * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
     * PARTICULAR PURPOSE.
     *
     * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
     * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
     * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
     * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
     * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
     * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
     * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
     * LIMITED REMEDY.
     *
     * 4.3. Licensee shall not export, either directly or indirectly, any of this
    * software or system incorporating such software without first obtaining any
    * required license or other approval from the U. S. Department of Commerce or
    * any other agency or department of the United States Government. In the
    * event Licensee exports any such software from the United States or
    * re-exports any such software from a foreign destination, Licensee shall
    * ensure that the distribution and export/re-export of the software is in
    * compliance with all laws, regulations, orders, or other restrictions of the
    * U.S. Export Administration Regulations. Licensee agrees that neither it nor
    * any of its subsidiaries will export/re-export any technical data, process,
    * software, or service, directly or indirectly, to any country for which the
    * United States government or any agency thereof requires an export license,
    * other governmental approval, or letter of assurance, without first obtaining
    * such license, approval or letter.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions, and the following disclaimer,
    *    without modification.
    * 2. Redistributions in binary form must reproduce at minimum a disclaimer
    *    substantially similar to the "NO WARRANTY" disclaimer below
    *    ("Disclaimer") and any redistribution must be conditioned upon
    *    including a substantially similar Disclaimer requirement for further
    *    binary redistribution.
    * 3. Neither the names of the above-listed copyright holders nor the names
    *    of any contributors may be used to endorse or promote products derived
    *    from this software without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #include <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/acinterp.h>
   
   
   #define _COMPONENT          ACPI_EXECUTER
           ACPI_MODULE_NAME    ("exstorob")
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiExStoreBufferToBuffer
    *
    * PARAMETERS:  SourceDesc          - Source object to copy
    *              TargetDesc          - Destination object of the copy
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Copy a buffer object to another buffer object.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiExStoreBufferToBuffer (
       ACPI_OPERAND_OBJECT     *SourceDesc,
       ACPI_OPERAND_OBJECT     *TargetDesc)
   {
       UINT32                  Length;
       UINT8                   *Buffer;
   
   
       ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc);
   
   
       /* If Source and Target are the same, just return */
   
       if (SourceDesc == TargetDesc)
       {
           return_ACPI_STATUS (AE_OK);
       }
   
       /* We know that SourceDesc is a buffer by now */
   
       Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer);
       Length = SourceDesc->Buffer.Length;
   
       /*
        * If target is a buffer of length zero or is a static buffer,
        * allocate a new buffer of the proper length
        */
       if ((TargetDesc->Buffer.Length == 0) ||
           (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))
       {
           TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length);
           if (!TargetDesc->Buffer.Pointer)
           {
               return_ACPI_STATUS (AE_NO_MEMORY);
           }
   
           TargetDesc->Buffer.Length = Length;
       }
   
       /* Copy source buffer to target buffer */
   
       if (Length <= TargetDesc->Buffer.Length)
       {
           /* Clear existing buffer and copy in the new one */
   
           memset (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length);
           memcpy (TargetDesc->Buffer.Pointer, Buffer, Length);
   
   #ifdef ACPI_OBSOLETE_BEHAVIOR
           /*
            * NOTE: ACPI versions up to 3.0 specified that the buffer must be
            * truncated if the string is smaller than the buffer. However, "other"
            * implementations of ACPI never did this and thus became the defacto
            * standard. ACPI 3.0A changes this behavior such that the buffer
            * is no longer truncated.
            */
   
           /*
            * OBSOLETE BEHAVIOR:
            * If the original source was a string, we must truncate the buffer,
            * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
            * copy must not truncate the original buffer.
            */
           if (OriginalSrcType == ACPI_TYPE_STRING)
           {
               /* Set the new length of the target */
   
               TargetDesc->Buffer.Length = Length;
           }
   #endif
       }
       else
       {
           /* Truncate the source, copy only what will fit */
   
           memcpy (TargetDesc->Buffer.Pointer, Buffer,
               TargetDesc->Buffer.Length);
   
           ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
               "Truncating source buffer from %X to %X\n",
               Length, TargetDesc->Buffer.Length));
       }
   
       /* Copy flags */
   
       TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags;
       TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
       return_ACPI_STATUS (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiExStoreStringToString
    *
    * PARAMETERS:  SourceDesc          - Source object to copy
    *              TargetDesc          - Destination object of the copy
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Copy a String object to another String object
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiExStoreStringToString (
       ACPI_OPERAND_OBJECT     *SourceDesc,
       ACPI_OPERAND_OBJECT     *TargetDesc)
   {
       UINT32                  Length;
       UINT8                   *Buffer;
   
   
       ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc);
   
   
       /* If Source and Target are the same, just return */
   
       if (SourceDesc == TargetDesc)
       {
           return_ACPI_STATUS (AE_OK);
       }
   
       /* We know that SourceDesc is a string by now */
   
       Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer);
       Length = SourceDesc->String.Length;
   
       /*
        * Replace existing string value if it will fit and the string
        * pointer is not a static pointer (part of an ACPI table)
        */
       if ((Length < TargetDesc->String.Length) &&
          (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
       {
           /*
            * String will fit in existing non-static buffer.
            * Clear old string and copy in the new one
            */
           memset (TargetDesc->String.Pointer, 0,
               (ACPI_SIZE) TargetDesc->String.Length + 1);
           memcpy (TargetDesc->String.Pointer, Buffer, Length);
       }
       else
       {
           /*
            * Free the current buffer, then allocate a new buffer
            * large enough to hold the value
            */
           if (TargetDesc->String.Pointer &&
              (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
           {
               /* Only free if not a pointer into the DSDT */
   
               ACPI_FREE (TargetDesc->String.Pointer);
           }
   
           TargetDesc->String.Pointer =
               ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) Length + 1);
   
           if (!TargetDesc->String.Pointer)
           {
               return_ACPI_STATUS (AE_NO_MEMORY);
           }
   
           TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
           memcpy (TargetDesc->String.Pointer, Buffer, Length);
       }
   
       /* Set the new target length */
   
       TargetDesc->String.Length = Length;
       return_ACPI_STATUS (AE_OK);
   }

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