Initial import of the Intel-maintained ACPI Component Architecture. This

is Intel's reference implementation of the core operating-system ACPI
support.  (This import is on the vendor branch.)

1 files changed, 682 insertions, 0 deletions

diff --git a/sys/contrib/dev/acpica/exmisc.c b/sys/contrib/dev/acpica/exmisc.c
new file mode 100644
index 000000000000..7decf64e6d02
--- /dev/null
+++ b/sys/contrib/dev/acpica/exmisc.c
@@ -0,0 +1,682 @@
+
+/******************************************************************************
+ *
+ * Module Name: ammisc - ACPI AML (p-code) execution - specific opcodes
+ *              $Revision: 70 $
+ *
+ *****************************************************************************/
+
+/******************************************************************************
+ *
+ * 1. Copyright Notice
+ *
+ * Some or all of this work - Copyright (c) 1999, 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.
+ *
+ *****************************************************************************/
+
+#define __AMMISC_C__
+
+#include "acpi.h"
+#include "acparser.h"
+#include "acinterp.h"
+#include "amlcode.h"
+#include "acdispat.h"
+
+
+#define _COMPONENT          INTERPRETER
+        MODULE_NAME         ("ammisc")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiAmlExecFatal
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      Status.  If the OS returns from the OSD call, we just keep
+ *              on going.
+ *
+ * DESCRIPTION: Execute Fatal operator
+ *
+ * ACPI SPECIFICATION REFERENCES:
+ *  DefFatal    :=  FatalOp FatalType   FatalCode   FatalArg
+ *  FatalType   :=  ByteData
+ *  FatalCode   :=  DWordData
+ *  FatalArg    :=  TermArg=>Integer
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiAmlExecFatal (
+    ACPI_WALK_STATE         *WalkState)
+{
+    ACPI_OPERAND_OBJECT     *TypeDesc;
+    ACPI_OPERAND_OBJECT     *CodeDesc;
+    ACPI_OPERAND_OBJECT     *ArgDesc;
+    ACPI_STATUS             Status;
+
+
+    FUNCTION_TRACE ("AmlExecFatal");
+
+
+    /* Resolve operands */
+
+    Status = AcpiAmlResolveOperands (AML_FATAL_OP, WALK_OPERANDS, WalkState);
+    DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE,
+                    AcpiPsGetOpcodeName (AML_FATAL_OP),
+                    3, "after AcpiAmlResolveOperands");
+
+    /* Get operands */
+
+    Status |= AcpiDsObjStackPopObject (&ArgDesc, WalkState);
+    Status |= AcpiDsObjStackPopObject (&CodeDesc, WalkState);
+    Status |= AcpiDsObjStackPopObject (&TypeDesc, WalkState);
+    if (ACPI_FAILURE (Status))
+    {
+        /* Invalid parameters on object stack  */
+
+        DEBUG_PRINT (ACPI_ERROR,
+            ("AcpiAmlExecFatal/AML_FATAL_OP: bad operand(s) (0x%X)\n",
+            Status));
+
+        goto Cleanup;
+    }
+
+
+    /* DefFatal    :=  FatalOp FatalType   FatalCode   FatalArg    */
+
+
+    DEBUG_PRINT (ACPI_INFO,
+        ("FatalOp: Type %x Code %x Arg %x <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
+        TypeDesc->Number.Value, CodeDesc->Number.Value, ArgDesc->Number.Value));
+
+
+    /*
+     * TBD: [Unhandled] call OSD interface to notify OS of fatal error
+     * requiring shutdown!
+     */
+
+
+Cleanup:
+
+    /* Free the operands */
+
+    AcpiCmRemoveReference (ArgDesc);
+    AcpiCmRemoveReference (CodeDesc);
+    AcpiCmRemoveReference (TypeDesc);
+
+
+    /* If we get back from the OS call, we might as well keep going. */
+
+    REPORT_WARNING (("An AML \"Fatal\" Opcode (FatalOp) was executed\n"));
+    return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiAmlExecIndex
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Execute Index operator
+ *
+ * ALLOCATION:  Deletes one operand descriptor -- other remains on stack
+ *
+ *  ACPI SPECIFICATION REFERENCES:
+ *  DefIndex    :=  IndexOp BuffPkgObj IndexValue Result
+ *  IndexValue  :=  TermArg=>Integer
+ *  NameString  :=  <RootChar NamePath> | <PrefixPath NamePath>
+ *  Result      :=  SuperName
+ *  SuperName   :=  NameString | ArgObj | LocalObj | DebugObj | DefIndex
+ *                             Local4Op | Local5Op | Local6Op | Local7Op
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiAmlExecIndex (
+    ACPI_WALK_STATE         *WalkState,
+    ACPI_OPERAND_OBJECT     **ReturnDesc)
+{
+    ACPI_OPERAND_OBJECT     *ObjDesc;
+    ACPI_OPERAND_OBJECT     *IdxDesc;
+    ACPI_OPERAND_OBJECT     *ResDesc;
+    ACPI_OPERAND_OBJECT     *RetDesc = NULL;
+    ACPI_OPERAND_OBJECT     *TmpDesc;
+    ACPI_STATUS             Status;
+
+
+    FUNCTION_TRACE ("AmlExecIndex");
+
+
+    /* Resolve operands */
+    /* First operand can be either a package or a buffer */
+
+    Status = AcpiAmlResolveOperands (AML_INDEX_OP, WALK_OPERANDS, WalkState);
+    DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE,
+                    AcpiPsGetOpcodeName (AML_INDEX_OP),
+                    3, "after AcpiAmlResolveOperands");
+
+    /* Get all operands */
+
+    Status |= AcpiDsObjStackPopObject (&ResDesc, WalkState);
+    Status |= AcpiDsObjStackPopObject (&IdxDesc, WalkState);
+    Status |= AcpiDsObjStackPopObject (&ObjDesc, WalkState);
+    if (ACPI_FAILURE (Status))
+    {
+        /* Invalid parameters on object stack  */
+
+        DEBUG_PRINT (ACPI_ERROR,
+            ("AcpiAmlExecIndex/AML_INDEX_OP: bad operand(s) (0x%X)\n",
+            Status));
+
+        goto Cleanup;
+    }
+
+
+    /* Create the internal return object */
+
+    RetDesc = AcpiCmCreateInternalObject (INTERNAL_TYPE_REFERENCE);
+    if (!RetDesc)
+    {
+        Status = AE_NO_MEMORY;
+        goto Cleanup;
+    }
+
+
+    /*
+     * At this point, the ObjDesc operand is either a Package or a Buffer
+     */
+
+    if (ObjDesc->Common.Type == ACPI_TYPE_PACKAGE)
+    {
+        /* Object to be indexed is a Package */
+
+        if (IdxDesc->Number.Value >= ObjDesc->Package.Count)
+        {
+            DEBUG_PRINT (ACPI_ERROR,
+                ("AmlExecIndex: Index value out of range\n"));
+            Status = AE_AML_PACKAGE_LIMIT;
+            goto Cleanup;
+        }
+
+        if ((ResDesc->Common.Type == INTERNAL_TYPE_REFERENCE) &&
+            (ResDesc->Reference.OpCode == AML_ZERO_OP))
+        {
+            /*
+             * There is no actual result descriptor (the ZeroOp Result
+             * descriptor is a placeholder), so just delete the placeholder and
+             * return a reference to the package element
+             */
+
+            AcpiCmRemoveReference (ResDesc);
+        }
+
+        else
+        {
+            /*
+             * Each element of the package is an internal object.  Get the one
+             * we are after.
+             */
+
+            TmpDesc                       = ObjDesc->Package.Elements[IdxDesc->Number.Value];
+            RetDesc->Reference.OpCode     = AML_INDEX_OP;
+            RetDesc->Reference.TargetType = TmpDesc->Common.Type;
+            RetDesc->Reference.Object     = TmpDesc;
+
+            Status = AcpiAmlExecStore (RetDesc, ResDesc, WalkState);
+            RetDesc->Reference.Object     = NULL;
+        }
+
+        /*
+         * The local return object must always be a reference to the package element,
+         * not the element itself.
+         */
+        RetDesc->Reference.OpCode     = AML_INDEX_OP;
+        RetDesc->Reference.TargetType = ACPI_TYPE_PACKAGE;
+        RetDesc->Reference.Where      = &ObjDesc->Package.Elements[IdxDesc->Number.Value];
+    }
+
+    else
+    {
+        /* Object to be indexed is a Buffer */
+
+        if (IdxDesc->Number.Value >= ObjDesc->Buffer.Length)
+        {
+            DEBUG_PRINT (ACPI_ERROR,
+                ("AmlExecIndex: Index value out of range\n"));
+            Status = AE_AML_BUFFER_LIMIT;
+            goto Cleanup;
+        }
+
+        RetDesc->Reference.OpCode       = AML_INDEX_OP;
+        RetDesc->Reference.TargetType   = ACPI_TYPE_BUFFER_FIELD;
+        RetDesc->Reference.Object       = ObjDesc;
+        RetDesc->Reference.Offset       = (UINT32) IdxDesc->Number.Value;
+
+        Status = AcpiAmlExecStore (RetDesc, ResDesc, WalkState);
+    }
+
+
+Cleanup:
+
+    /* Always delete operands */
+
+    AcpiCmRemoveReference (ObjDesc);
+    AcpiCmRemoveReference (IdxDesc);
+
+    /* Delete return object on error */
+
+    if (ACPI_FAILURE (Status))
+    {
+        AcpiCmRemoveReference (ResDesc);
+
+        if (RetDesc)
+        {
+            AcpiCmRemoveReference (RetDesc);
+            RetDesc = NULL;
+        }
+    }
+
+    /* Set the return object and exit */
+
+    *ReturnDesc = RetDesc;
+    return_ACPI_STATUS (Status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiAmlExecMatch
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Execute Match operator
+ *
+ * ACPI SPECIFICATION REFERENCES:
+ *  DefMatch    :=  MatchOp SearchPkg   Opcode1     Operand1
+ *                              Opcode2 Operand2    StartIndex
+ *  Opcode1     :=  ByteData: MTR, MEQ, MLE, MLT, MGE, or MGT
+ *  Opcode2     :=  ByteData: MTR, MEQ, MLE, MLT, MGE, or MGT
+ *  Operand1    :=  TermArg=>Integer
+ *  Operand2    :=  TermArg=>Integer
+ *  SearchPkg   :=  TermArg=>PackageObject
+ *  StartIndex  :=  TermArg=>Integer
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiAmlExecMatch (
+    ACPI_WALK_STATE         *WalkState,
+    ACPI_OPERAND_OBJECT     **ReturnDesc)
+{
+    ACPI_OPERAND_OBJECT     *PkgDesc;
+    ACPI_OPERAND_OBJECT     *Op1Desc;
+    ACPI_OPERAND_OBJECT     *V1Desc;
+    ACPI_OPERAND_OBJECT     *Op2Desc;
+    ACPI_OPERAND_OBJECT     *V2Desc;
+    ACPI_OPERAND_OBJECT     *StartDesc;
+    ACPI_OPERAND_OBJECT     *RetDesc = NULL;
+    ACPI_STATUS             Status;
+    UINT32                  Index;
+    UINT32                  MatchValue = (UINT32) -1;
+
+
+    FUNCTION_TRACE ("AmlExecMatch");
+
+
+    /* Resolve all operands */
+
+    Status = AcpiAmlResolveOperands (AML_MATCH_OP, WALK_OPERANDS, WalkState);
+    DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE,
+                    AcpiPsGetOpcodeName (AML_MATCH_OP),
+                    6, "after AcpiAmlResolveOperands");
+
+    /* Get all operands */
+
+    Status |= AcpiDsObjStackPopObject (&StartDesc, WalkState);
+    Status |= AcpiDsObjStackPopObject (&V2Desc, WalkState);
+    Status |= AcpiDsObjStackPopObject (&Op2Desc, WalkState);
+    Status |= AcpiDsObjStackPopObject (&V1Desc, WalkState);
+    Status |= AcpiDsObjStackPopObject (&Op1Desc, WalkState);
+    Status |= AcpiDsObjStackPopObject (&PkgDesc, WalkState);
+
+    if (ACPI_FAILURE (Status))
+    {
+        /* Invalid parameters on object stack  */
+
+        DEBUG_PRINT (ACPI_ERROR,
+            ("ExecMatch/AML_MATCH_OP: bad operand(s) (0x%X)\n",
+            Status));
+
+        goto Cleanup;
+    }
+
+    /* Validate match comparison sub-opcodes */
+
+    if ((Op1Desc->Number.Value > MAX_MATCH_OPERATOR) ||
+        (Op2Desc->Number.Value > MAX_MATCH_OPERATOR))
+    {
+        DEBUG_PRINT (ACPI_ERROR,
+            ("AmlExecMatch: operation encoding out of range\n"));
+        Status = AE_AML_OPERAND_VALUE;
+        goto Cleanup;
+    }
+
+    Index = (UINT32) StartDesc->Number.Value;
+    if (Index >= (UINT32) PkgDesc->Package.Count)
+    {
+        DEBUG_PRINT (ACPI_ERROR,
+            ("AmlExecMatch: start position value out of range\n"));
+        Status = AE_AML_PACKAGE_LIMIT;
+        goto Cleanup;
+    }
+
+    RetDesc = AcpiCmCreateInternalObject (ACPI_TYPE_NUMBER);
+    if (!RetDesc)
+    {
+        Status = AE_NO_MEMORY;
+        goto Cleanup;
+
+    }
+
+    /*
+     * Examine each element until a match is found.  Within the loop,
+     * "continue" signifies that the current element does not match
+     * and the next should be examined.
+     * Upon finding a match, the loop will terminate via "break" at
+     * the bottom.  If it terminates "normally", MatchValue will be -1
+     * (its initial value) indicating that no match was found.  When
+     * returned as a Number, this will produce the Ones value as specified.
+     */
+
+    for ( ; Index < PkgDesc->Package.Count; ++Index)
+    {
+        /*
+         * Treat any NULL or non-numeric elements as non-matching.
+         * TBD [Unhandled] - if an element is a Name,
+         *      should we examine its value?
+         */
+        if (!PkgDesc->Package.Elements[Index] ||
+            ACPI_TYPE_NUMBER != PkgDesc->Package.Elements[Index]->Common.Type)
+        {
+            continue;
+        }
+
+        /*
+         * Within these switch statements:
+         *      "break" (exit from the switch) signifies a match;
+         *      "continue" (proceed to next iteration of enclosing
+         *          "for" loop) signifies a non-match.
+         */
+        switch (Op1Desc->Number.Value)
+        {
+
+        case MATCH_MTR:   /* always true */
+
+            break;
+
+
+        case MATCH_MEQ:   /* true if equal   */
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 != V1Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        case MATCH_MLE:   /* true if less than or equal  */
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 > V1Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        case MATCH_MLT:   /* true if less than   */
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 >= V1Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        case MATCH_MGE:   /* true if greater than or equal   */
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 < V1Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        case MATCH_MGT:   /* true if greater than    */
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 <= V1Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        default:    /* undefined   */
+
+            continue;
+        }
+
+
+        switch(Op2Desc->Number.Value)
+        {
+
+        case MATCH_MTR:
+
+            break;
+
+
+        case MATCH_MEQ:
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 != V2Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        case MATCH_MLE:
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 > V2Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        case MATCH_MLT:
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 >= V2Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        case MATCH_MGE:
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 < V2Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        case MATCH_MGT:
+
+            if (PkgDesc->Package.Elements[Index]->Number.Value
+                 <= V2Desc->Number.Value)
+            {
+                continue;
+            }
+            break;
+
+
+        default:
+
+            continue;
+        }
+
+        /* Match found: exit from loop */
+
+        MatchValue = Index;
+        break;
+    }
+
+    /* MatchValue is the return value */
+
+    RetDesc->Number.Value = MatchValue;
+
+
+Cleanup:
+
+    /* Free the operands */
+
+    AcpiCmRemoveReference (StartDesc);
+    AcpiCmRemoveReference (V2Desc);
+    AcpiCmRemoveReference (Op2Desc);
+    AcpiCmRemoveReference (V1Desc);
+    AcpiCmRemoveReference (Op1Desc);
+    AcpiCmRemoveReference (PkgDesc);
+
+
+    /* Delete return object on error */
+
+    if (ACPI_FAILURE (Status) &&
+        (RetDesc))
+    {
+        AcpiCmRemoveReference (RetDesc);
+        RetDesc = NULL;
+    }
+
+
+    /* Set the return object and exit */
+
+    *ReturnDesc = RetDesc;
+    return_ACPI_STATUS (Status);
+}