FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/namespace/nsrepair.c

     /******************************************************************************
      *
      * Module Name: nsrepair - Repair for objects returned by predefined methods
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 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/acnamesp.h>
   #include <contrib/dev/acpica/include/acinterp.h>
   #include <contrib/dev/acpica/include/acpredef.h>
   #include <contrib/dev/acpica/include/amlresrc.h>
   
   #define _COMPONENT          ACPI_NAMESPACE
           ACPI_MODULE_NAME    ("nsrepair")
   
   
   /*******************************************************************************
    *
    * This module attempts to repair or convert objects returned by the
    * predefined methods to an object type that is expected, as per the ACPI
    * specification. The need for this code is dictated by the many machines that
    * return incorrect types for the standard predefined methods. Performing these
    * conversions here, in one place, eliminates the need for individual ACPI
    * device drivers to do the same. Note: Most of these conversions are different
    * than the internal object conversion routines used for implicit object
    * conversion.
    *
    * The following conversions can be performed as necessary:
    *
    * Integer -> String
    * Integer -> Buffer
    * String  -> Integer
    * String  -> Buffer
    * Buffer  -> Integer
    * Buffer  -> String
    * Buffer  -> Package of Integers
    * Package -> Package of one Package
    *
    * Additional conversions that are available:
    *  Convert a null return or zero return value to an EndTag descriptor
    *  Convert an ASCII string to a Unicode buffer
    *
    * An incorrect standalone object is wrapped with required outer package
    *
    * Additional possible repairs:
    * Required package elements that are NULL replaced by Integer/String/Buffer
    *
    ******************************************************************************/
   
   
   /* Local prototypes */
   
   static const ACPI_SIMPLE_REPAIR_INFO *
   AcpiNsMatchSimpleRepair (
       ACPI_NAMESPACE_NODE     *Node,
       UINT32                  ReturnBtype,
       UINT32                  PackageIndex);
   
   
   /*
    * Special but simple repairs for some names.
    *
    * 2nd argument: Unexpected types that can be repaired
    */
   static const ACPI_SIMPLE_REPAIR_INFO    AcpiObjectRepairInfo[] =
   {
       /* Resource descriptor conversions */
   
       { "_CRS", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE,
                   ACPI_NOT_PACKAGE_ELEMENT,
                   AcpiNsConvertToResource },
       { "_DMA", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE,
                   ACPI_NOT_PACKAGE_ELEMENT,
                   AcpiNsConvertToResource },
       { "_PRS", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE,
                   ACPI_NOT_PACKAGE_ELEMENT,
                   AcpiNsConvertToResource },
   
       /* Object reference conversions */
   
       { "_DEP", ACPI_RTYPE_STRING, ACPI_ALL_PACKAGE_ELEMENTS,
                   AcpiNsConvertToReference },
   
       /* Unicode conversions */
   
       { "_MLS", ACPI_RTYPE_STRING, 1,
                   AcpiNsConvertToUnicode },
       { "_STR", ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER,
                   ACPI_NOT_PACKAGE_ELEMENT,
                   AcpiNsConvertToUnicode },
       { {0,0,0,0}, 0, 0, NULL } /* Table terminator */
   };
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiNsSimpleRepair
    *
    * PARAMETERS:  Info                - Method execution information block
    *              ExpectedBtypes      - Object types expected
    *              PackageIndex        - Index of object within parent package (if
    *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
    *                                    otherwise)
    *              ReturnObjectPtr     - Pointer to the object returned from the
    *                                    evaluation of a method or object
    *
    * RETURN:      Status. AE_OK if repair was successful.
    *
    * DESCRIPTION: Attempt to repair/convert a return object of a type that was
    *              not expected.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiNsSimpleRepair (
       ACPI_EVALUATE_INFO      *Info,
       UINT32                  ExpectedBtypes,
       UINT32                  PackageIndex,
       ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
   {
       ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
       ACPI_OPERAND_OBJECT     *NewObject = NULL;
       ACPI_STATUS             Status;
       const ACPI_SIMPLE_REPAIR_INFO   *Predefined;
   
   
       ACPI_FUNCTION_NAME (NsSimpleRepair);
   
   
       /*
        * Special repairs for certain names that are in the repair table.
        * Check if this name is in the list of repairable names.
        */
       Predefined = AcpiNsMatchSimpleRepair (Info->Node,
           Info->ReturnBtype, PackageIndex);
       if (Predefined)
       {
           if (!ReturnObject)
           {
               ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname,
                   ACPI_WARN_ALWAYS, "Missing expected return value"));
           }
   
           Status = Predefined->ObjectConverter (Info->Node, ReturnObject,
               &NewObject);
           if (ACPI_FAILURE (Status))
           {
               /* A fatal error occurred during a conversion */
   
               ACPI_EXCEPTION ((AE_INFO, Status,
                   "During return object analysis"));
               return (Status);
           }
           if (NewObject)
           {
               goto ObjectRepaired;
           }
       }
   
       /*
        * Do not perform simple object repair unless the return type is not
        * expected.
        */
       if (Info->ReturnBtype & ExpectedBtypes)
       {
           return (AE_OK);
       }
   
       /*
        * At this point, we know that the type of the returned object was not
        * one of the expected types for this predefined name. Attempt to
        * repair the object by converting it to one of the expected object
        * types for this predefined name.
        */
   
       /*
        * If there is no return value, check if we require a return value for
        * this predefined name. Either one return value is expected, or none,
        * for both methods and other objects.
        *
        * Try to fix if there was no return object. Warning if failed to fix.
        */
       if (!ReturnObject)
       {
           if (ExpectedBtypes && (!(ExpectedBtypes & ACPI_RTYPE_NONE)))
           {
               if (PackageIndex != ACPI_NOT_PACKAGE_ELEMENT)
               {
                   ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname,
                       ACPI_WARN_ALWAYS, "Found unexpected NULL package element"));
   
                   Status = AcpiNsRepairNullElement (Info, ExpectedBtypes,
                       PackageIndex, ReturnObjectPtr);
                   if (ACPI_SUCCESS (Status))
                   {
                       return (AE_OK); /* Repair was successful */
                   }
               }
               else
               {
                   ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname,
                       ACPI_WARN_ALWAYS, "Missing expected return value"));
               }
   
               return (AE_AML_NO_RETURN_VALUE);
           }
       }
   
       if (ExpectedBtypes & ACPI_RTYPE_INTEGER)
       {
           Status = AcpiNsConvertToInteger (ReturnObject, &NewObject);
           if (ACPI_SUCCESS (Status))
           {
               goto ObjectRepaired;
           }
       }
       if (ExpectedBtypes & ACPI_RTYPE_STRING)
       {
           Status = AcpiNsConvertToString (ReturnObject, &NewObject);
           if (ACPI_SUCCESS (Status))
           {
               goto ObjectRepaired;
           }
       }
       if (ExpectedBtypes & ACPI_RTYPE_BUFFER)
       {
           Status = AcpiNsConvertToBuffer (ReturnObject, &NewObject);
           if (ACPI_SUCCESS (Status))
           {
               goto ObjectRepaired;
           }
       }
       if (ExpectedBtypes & ACPI_RTYPE_PACKAGE)
       {
           /*
            * A package is expected. We will wrap the existing object with a
            * new package object. It is often the case that if a variable-length
            * package is required, but there is only a single object needed, the
            * BIOS will return that object instead of wrapping it with a Package
            * object. Note: after the wrapping, the package will be validated
            * for correct contents (expected object type or types).
            */
           Status = AcpiNsWrapWithPackage (Info, ReturnObject, &NewObject);
           if (ACPI_SUCCESS (Status))
           {
               /*
                * The original object just had its reference count
                * incremented for being inserted into the new package.
                */
               *ReturnObjectPtr = NewObject;       /* New Package object */
               Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
               return (AE_OK);
           }
       }
   
       /* We cannot repair this object */
   
       return (AE_AML_OPERAND_TYPE);
   
   
   ObjectRepaired:
   
       /* Object was successfully repaired */
   
       if (PackageIndex != ACPI_NOT_PACKAGE_ELEMENT)
       {
           /* Update reference count of new object */
   
           if (!(Info->ReturnFlags & ACPI_OBJECT_WRAPPED))
           {
               NewObject->Common.ReferenceCount =
                   ReturnObject->Common.ReferenceCount;
           }
   
           ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
               "%s: Converted %s to expected %s at Package index %u\n",
               Info->FullPathname, AcpiUtGetObjectTypeName (ReturnObject),
               AcpiUtGetObjectTypeName (NewObject), PackageIndex));
       }
       else
       {
           ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
               "%s: Converted %s to expected %s\n",
               Info->FullPathname, AcpiUtGetObjectTypeName (ReturnObject),
               AcpiUtGetObjectTypeName (NewObject)));
       }
   
       /* Delete old object, install the new return object */
   
       AcpiUtRemoveReference (ReturnObject);
       *ReturnObjectPtr = NewObject;
       Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
       return (AE_OK);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    AcpiNsMatchSimpleRepair
    *
    * PARAMETERS:  Node                - Namespace node for the method/object
    *              ReturnBtype         - Object type that was returned
    *              PackageIndex        - Index of object within parent package (if
    *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
    *                                    otherwise)
    *
    * RETURN:      Pointer to entry in repair table. NULL indicates not found.
    *
    * DESCRIPTION: Check an object name against the repairable object list.
    *
    *****************************************************************************/
   
   static const ACPI_SIMPLE_REPAIR_INFO *
   AcpiNsMatchSimpleRepair (
       ACPI_NAMESPACE_NODE     *Node,
       UINT32                  ReturnBtype,
       UINT32                  PackageIndex)
   {
       const ACPI_SIMPLE_REPAIR_INFO   *ThisName;
   
   
       /* Search info table for a repairable predefined method/object name */
   
       ThisName = AcpiObjectRepairInfo;
       while (ThisName->ObjectConverter)
       {
           if (ACPI_COMPARE_NAMESEG (Node->Name.Ascii, ThisName->Name))
           {
               /* Check if we can actually repair this name/type combination */
   
               if ((ReturnBtype & ThisName->UnexpectedBtypes) &&
                   (ThisName->PackageIndex == ACPI_ALL_PACKAGE_ELEMENTS ||
                    PackageIndex == ThisName->PackageIndex))
               {
                   return (ThisName);
               }
   
               return (NULL);
           }
   
           ThisName++;
       }
   
       return (NULL); /* Name was not found in the repair table */
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiNsRepairNullElement
    *
    * PARAMETERS:  Info                - Method execution information block
    *              ExpectedBtypes      - Object types expected
    *              PackageIndex        - Index of object within parent package (if
    *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
    *                                    otherwise)
    *              ReturnObjectPtr     - Pointer to the object returned from the
    *                                    evaluation of a method or object
    *
    * RETURN:      Status. AE_OK if repair was successful.
    *
    * DESCRIPTION: Attempt to repair a NULL element of a returned Package object.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiNsRepairNullElement (
       ACPI_EVALUATE_INFO      *Info,
       UINT32                  ExpectedBtypes,
       UINT32                  PackageIndex,
       ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
   {
       ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
       ACPI_OPERAND_OBJECT     *NewObject;
   
   
       ACPI_FUNCTION_NAME (NsRepairNullElement);
   
   
       /* No repair needed if return object is non-NULL */
   
       if (ReturnObject)
       {
           return (AE_OK);
       }
   
       /*
        * Attempt to repair a NULL element of a Package object. This applies to
        * predefined names that return a fixed-length package and each element
        * is required. It does not apply to variable-length packages where NULL
        * elements are allowed, especially at the end of the package.
        */
       if (ExpectedBtypes & ACPI_RTYPE_INTEGER)
       {
           /* Need an Integer - create a zero-value integer */
   
           NewObject = AcpiUtCreateIntegerObject ((UINT64) 0);
       }
       else if (ExpectedBtypes & ACPI_RTYPE_STRING)
       {
           /* Need a String - create a NULL string */
   
           NewObject = AcpiUtCreateStringObject (0);
       }
       else if (ExpectedBtypes & ACPI_RTYPE_BUFFER)
       {
           /* Need a Buffer - create a zero-length buffer */
   
           NewObject = AcpiUtCreateBufferObject (0);
       }
       else
       {
           /* Error for all other expected types */
   
           return (AE_AML_OPERAND_TYPE);
       }
   
       if (!NewObject)
       {
           return (AE_NO_MEMORY);
       }
   
       /* Set the reference count according to the parent Package object */
   
       NewObject->Common.ReferenceCount =
           Info->ParentPackage->Common.ReferenceCount;
   
       ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
           "%s: Converted NULL package element to expected %s at index %u\n",
           Info->FullPathname, AcpiUtGetObjectTypeName (NewObject),
           PackageIndex));
   
       *ReturnObjectPtr = NewObject;
       Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
       return (AE_OK);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    AcpiNsRemoveNullElements
    *
    * PARAMETERS:  Info                - Method execution information block
    *              PackageType         - An AcpiReturnPackageTypes value
    *              ObjDesc             - A Package object
    *
    * RETURN:      None.
    *
    * DESCRIPTION: Remove all NULL package elements from packages that contain
    *              a variable number of subpackages. For these types of
    *              packages, NULL elements can be safely removed.
    *
    *****************************************************************************/
   
   void
   AcpiNsRemoveNullElements (
       ACPI_EVALUATE_INFO      *Info,
       UINT8                   PackageType,
       ACPI_OPERAND_OBJECT     *ObjDesc)
   {
       ACPI_OPERAND_OBJECT     **Source;
       ACPI_OPERAND_OBJECT     **Dest;
       UINT32                  Count;
       UINT32                  NewCount;
       UINT32                  i;
   
   
       ACPI_FUNCTION_NAME (NsRemoveNullElements);
   
   
       /*
        * We can safely remove all NULL elements from these package types:
        * PTYPE1_VAR packages contain a variable number of simple data types.
        * PTYPE2 packages contain a variable number of subpackages.
        */
       switch (PackageType)
       {
       case ACPI_PTYPE1_VAR:
       case ACPI_PTYPE2:
       case ACPI_PTYPE2_COUNT:
       case ACPI_PTYPE2_PKG_COUNT:
       case ACPI_PTYPE2_FIXED:
       case ACPI_PTYPE2_MIN:
       case ACPI_PTYPE2_REV_FIXED:
       case ACPI_PTYPE2_FIX_VAR:
           break;
   
       default:
       case ACPI_PTYPE2_VAR_VAR:
       case ACPI_PTYPE1_FIXED:
       case ACPI_PTYPE1_OPTION:
           return;
       }
   
       Count = ObjDesc->Package.Count;
       NewCount = Count;
   
       Source = ObjDesc->Package.Elements;
       Dest = Source;
   
       /* Examine all elements of the package object, remove nulls */
   
       for (i = 0; i < Count; i++)
       {
           if (!*Source)
           {
               NewCount--;
           }
           else
           {
               *Dest = *Source;
               Dest++;
           }
   
           Source++;
       }
   
       /* Update parent package if any null elements were removed */
   
       if (NewCount < Count)
       {
           ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
               "%s: Found and removed %u NULL elements\n",
               Info->FullPathname, (Count - NewCount)));
   
           /* NULL terminate list and update the package count */
   
           *Dest = NULL;
           ObjDesc->Package.Count = NewCount;
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiNsWrapWithPackage
    *
    * PARAMETERS:  Info                - Method execution information block
    *              OriginalObject      - Pointer to the object to repair.
    *              ObjDescPtr          - The new package object is returned here
    *
    * RETURN:      Status, new object in *ObjDescPtr
    *
    * DESCRIPTION: Repair a common problem with objects that are defined to
    *              return a variable-length Package of sub-objects. If there is
    *              only one sub-object, some BIOS code mistakenly simply declares
    *              the single object instead of a Package with one sub-object.
    *              This function attempts to repair this error by wrapping a
    *              Package object around the original object, creating the
    *              correct and expected Package with one sub-object.
    *
    *              Names that can be repaired in this manner include:
    *              _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS,
    *              _BCL, _DOD, _FIX, _Sx
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiNsWrapWithPackage (
       ACPI_EVALUATE_INFO      *Info,
       ACPI_OPERAND_OBJECT     *OriginalObject,
       ACPI_OPERAND_OBJECT     **ObjDescPtr)
   {
       ACPI_OPERAND_OBJECT     *PkgObjDesc;
   
   
       ACPI_FUNCTION_NAME (NsWrapWithPackage);
   
   
       /*
        * Create the new outer package and populate it. The new
        * package will have a single element, the lone sub-object.
        */
       PkgObjDesc = AcpiUtCreatePackageObject (1);
       if (!PkgObjDesc)
       {
           return (AE_NO_MEMORY);
       }
   
       PkgObjDesc->Package.Elements[0] = OriginalObject;
   
       ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
           "%s: Wrapped %s with expected Package object\n",
           Info->FullPathname, AcpiUtGetObjectTypeName (OriginalObject)));
   
       /* Return the new object in the object pointer */
   
       *ObjDescPtr = PkgObjDesc;
       Info->ReturnFlags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED;
       return (AE_OK);
   }

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