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diff --git a/sys/contrib/dev/acpica/exmutex.c b/sys/contrib/dev/acpica/exmutex.c
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+
+/******************************************************************************
+ *
+ * Module Name: exmutex - ASL Mutex Acquire/Release functions
+ *              $Revision: 16 $
+ *
+ *****************************************************************************/
+
+/******************************************************************************
+ *
+ * 1. Copyright Notice
+ *
+ * Some or all of this work - Copyright (c) 1999 - 2002, 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 __EXMUTEX_C__
+
+#include "acpi.h"
+#include "acinterp.h"
+
+#define _COMPONENT          ACPI_EXECUTER
+        ACPI_MODULE_NAME    ("exmutex")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiExUnlinkMutex
+ *
+ * PARAMETERS:  *ObjDesc            - The mutex to be unlinked
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
+ *
+ ******************************************************************************/
+
+void
+AcpiExUnlinkMutex (
+    ACPI_OPERAND_OBJECT     *ObjDesc)
+{
+    ACPI_THREAD_STATE       *Thread = ObjDesc->Mutex.OwnerThread;
+
+
+    if (!Thread)
+    {
+        return;
+    }
+
+    if (ObjDesc->Mutex.Next)
+    {
+        (ObjDesc->Mutex.Next)->Mutex.Prev = ObjDesc->Mutex.Prev;
+    }
+
+    if (ObjDesc->Mutex.Prev)
+    {
+        (ObjDesc->Mutex.Prev)->Mutex.Next = ObjDesc->Mutex.Next;
+    }
+    else
+    {
+        Thread->AcquiredMutexList = ObjDesc->Mutex.Next;
+    }
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiExLinkMutex
+ *
+ * PARAMETERS:  *ObjDesc            - The mutex to be linked
+ *              *ListHead           - head of the "AcquiredMutex" list
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
+ *
+ ******************************************************************************/
+
+void
+AcpiExLinkMutex (
+    ACPI_OPERAND_OBJECT     *ObjDesc,
+    ACPI_THREAD_STATE       *Thread)
+{
+    ACPI_OPERAND_OBJECT     *ListHead;
+
+
+    ListHead = Thread->AcquiredMutexList;
+
+    /* This object will be the first object in the list */
+
+    ObjDesc->Mutex.Prev = NULL;
+    ObjDesc->Mutex.Next = ListHead;
+
+    /* Update old first object to point back to this object */
+
+    if (ListHead)
+    {
+        ListHead->Mutex.Prev = ObjDesc;
+    }
+
+    /* Update list head */
+
+    Thread->AcquiredMutexList = ObjDesc;
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiExAcquireMutex
+ *
+ * PARAMETERS:  *TimeDesc           - The 'time to delay' object descriptor
+ *              *ObjDesc            - The object descriptor for this op
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Acquire an AML mutex
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiExAcquireMutex (
+    ACPI_OPERAND_OBJECT     *TimeDesc,
+    ACPI_OPERAND_OBJECT     *ObjDesc,
+    ACPI_WALK_STATE         *WalkState)
+{
+    ACPI_STATUS             Status;
+
+
+    ACPI_FUNCTION_TRACE_PTR ("ExAcquireMutex", ObjDesc);
+
+
+    if (!ObjDesc)
+    {
+        return_ACPI_STATUS (AE_BAD_PARAMETER);
+    }
+
+    /* Sanity check -- we must have a valid thread ID */
+
+    if (!WalkState->Thread)
+    {
+        ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], null thread info\n",
+                ObjDesc->Mutex.Node->Name.Ascii));
+        return_ACPI_STATUS (AE_AML_INTERNAL);
+    }
+
+    /*
+     * Current Sync must be less than or equal to the sync level of the
+     * mutex.  This mechanism provides some deadlock prevention
+     */
+    if (WalkState->Thread->CurrentSyncLevel > ObjDesc->Mutex.SyncLevel)
+    {
+        ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], incorrect SyncLevel\n",
+                ObjDesc->Mutex.Node->Name.Ascii));
+        return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
+    }
+
+    /*
+     * Support for multiple acquires by the owning thread
+     */
+
+    if ((ObjDesc->Mutex.OwnerThread) &&
+        (ObjDesc->Mutex.OwnerThread->ThreadId == WalkState->Thread->ThreadId))
+    {
+        /*
+         * The mutex is already owned by this thread,
+         * just increment the acquisition depth
+         */
+        ObjDesc->Mutex.AcquisitionDepth++;
+        return_ACPI_STATUS (AE_OK);
+    }
+
+    /* Acquire the mutex, wait if necessary */
+
+    Status = AcpiExSystemAcquireMutex (TimeDesc, ObjDesc);
+    if (ACPI_FAILURE (Status))
+    {
+        /* Includes failure from a timeout on TimeDesc */
+
+        return_ACPI_STATUS (Status);
+    }
+
+    /* Have the mutex, update mutex and walk info */
+
+    ObjDesc->Mutex.OwnerThread      = WalkState->Thread;
+    ObjDesc->Mutex.AcquisitionDepth = 1;
+
+    WalkState->Thread->CurrentSyncLevel = ObjDesc->Mutex.SyncLevel;
+
+    /* Link the mutex to the current thread for force-unlock at method exit */
+
+    AcpiExLinkMutex (ObjDesc, WalkState->Thread);
+
+    return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiExReleaseMutex
+ *
+ * PARAMETERS:  *ObjDesc            - The object descriptor for this op
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Release a previously acquired Mutex.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiExReleaseMutex (
+    ACPI_OPERAND_OBJECT     *ObjDesc,
+    ACPI_WALK_STATE         *WalkState)
+{
+    ACPI_STATUS             Status;
+
+
+    ACPI_FUNCTION_TRACE ("ExReleaseMutex");
+
+
+    if (!ObjDesc)
+    {
+        return_ACPI_STATUS (AE_BAD_PARAMETER);
+    }
+
+    /* The mutex must have been previously acquired in order to release it */
+
+    if (!ObjDesc->Mutex.OwnerThread)
+    {
+        ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], not acquired\n",
+                ObjDesc->Mutex.Node->Name.Ascii));
+        return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED);
+    }
+
+    /* Sanity check -- we must have a valid thread ID */
+
+    if (!WalkState->Thread)
+    {
+        ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], null thread info\n",
+                ObjDesc->Mutex.Node->Name.Ascii));
+        return_ACPI_STATUS (AE_AML_INTERNAL);
+    }
+
+    /* The Mutex is owned, but this thread must be the owner */
+
+    if (ObjDesc->Mutex.OwnerThread->ThreadId != WalkState->Thread->ThreadId)
+    {
+        ACPI_REPORT_ERROR ((
+            "Thread %X cannot release Mutex [%4.4s] acquired by thread %X\n",
+            WalkState->Thread->ThreadId,
+            ObjDesc->Mutex.Node->Name.Ascii, 
+            ObjDesc->Mutex.OwnerThread->ThreadId));
+        return_ACPI_STATUS (AE_AML_NOT_OWNER);
+    }
+
+    /*
+     * The sync level of the mutex must be less than or
+     * equal to the current sync level
+     */
+    if (ObjDesc->Mutex.SyncLevel > WalkState->Thread->CurrentSyncLevel)
+    {
+        ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], incorrect SyncLevel\n",
+                ObjDesc->Mutex.Node->Name.Ascii));
+        return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
+    }
+
+    /*
+     * Match multiple Acquires with multiple Releases
+     */
+    ObjDesc->Mutex.AcquisitionDepth--;
+    if (ObjDesc->Mutex.AcquisitionDepth != 0)
+    {
+        /* Just decrement the depth and return */
+
+        return_ACPI_STATUS (AE_OK);
+    }
+
+    /* Unlink the mutex from the owner's list */
+
+    AcpiExUnlinkMutex (ObjDesc);
+
+    /* Release the mutex */
+
+    Status = AcpiExSystemReleaseMutex (ObjDesc);
+
+    /* Update the mutex and walk state */
+
+    ObjDesc->Mutex.OwnerThread = NULL;
+    WalkState->Thread->CurrentSyncLevel = ObjDesc->Mutex.SyncLevel;
+
+    return_ACPI_STATUS (Status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiExReleaseAllMutexes
+ *
+ * PARAMETERS:  *MutexList            - Head of the mutex list
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Release all mutexes in the list
+ *
+ ******************************************************************************/
+
+void
+AcpiExReleaseAllMutexes (
+    ACPI_THREAD_STATE       *Thread)
+{
+    ACPI_OPERAND_OBJECT     *Next = Thread->AcquiredMutexList;
+    ACPI_OPERAND_OBJECT     *This;
+    ACPI_STATUS             Status;
+
+
+    ACPI_FUNCTION_ENTRY ();
+
+
+    /*
+     * Traverse the list of owned mutexes, releasing each one.
+     */
+    while (Next)
+    {
+        This = Next;
+        Next = This->Mutex.Next;
+
+        This->Mutex.AcquisitionDepth = 1;
+        This->Mutex.Prev             = NULL;
+        This->Mutex.Next             = NULL;
+
+         /* Release the mutex */
+
+        Status = AcpiExSystemReleaseMutex (This);
+        if (ACPI_FAILURE (Status))
+        {
+            continue;
+        }
+
+        /* Mark mutex unowned */
+
+        This->Mutex.OwnerThread      = NULL;
+    }
+}
+
+