xref: /src/sys/external/bsd/acpica/dist/debugger/dbexec.c

/*******************************************************************************
 *
 * Module Name: dbexec - debugger control method execution
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2019, Intel Corp.
 * All rights reserved.
 *
 * 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.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * 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 MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 */

#include "acpi.h"
#include "accommon.h"
#include "acdebug.h"
#include "acnamesp.h"


#define _COMPONENT          ACPI_CA_DEBUGGER
        ACPI_MODULE_NAME    ("dbexec")


static ACPI_DB_METHOD_INFO          AcpiGbl_DbMethodInfo;

/* Local prototypes */

static ACPI_STATUS
AcpiDbExecuteMethod (
    ACPI_DB_METHOD_INFO     *Info,
    ACPI_BUFFER             *ReturnObj);

static ACPI_STATUS
AcpiDbExecuteSetup (
    ACPI_DB_METHOD_INFO     *Info);

static UINT32
AcpiDbGetOutstandingAllocations (
    void);

static void ACPI_SYSTEM_XFACE
AcpiDbMethodThread (
    void                    *Context);

static ACPI_STATUS
AcpiDbExecutionWalk (
    ACPI_HANDLE             ObjHandle,
    UINT32                  NestingLevel,
    void                    *Context,
    void                    **ReturnValue);

static void ACPI_SYSTEM_XFACE
AcpiDbSingleExecutionThread (
    void                    *Context);


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbDeleteObjects
 *
 * PARAMETERS:  Count               - Count of objects in the list
 *              Objects             - Array of ACPI_OBJECTs to be deleted
 *
 * RETURN:      None
 *
 * DESCRIPTION: Delete a list of ACPI_OBJECTS. Handles packages and nested
 *              packages via recursion.
 *
 ******************************************************************************/

void
AcpiDbDeleteObjects (
    UINT32                  Count,
    ACPI_OBJECT             *Objects)
{
    UINT32                  i;


    for (i = 0; i < Count; i++)
    {
        switch (Objects[i].Type)
        {
        case ACPI_TYPE_BUFFER:

            ACPI_FREE (Objects[i].Buffer.Pointer);
            break;

        case ACPI_TYPE_PACKAGE:

            /* Recursive call to delete package elements */

            AcpiDbDeleteObjects (Objects[i].Package.Count,
                Objects[i].Package.Elements);

            /* Free the elements array */

            ACPI_FREE (Objects[i].Package.Elements);
            break;

        default:

            break;
        }
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbExecuteMethod
 *
 * PARAMETERS:  Info            - Valid info segment
 *              ReturnObj       - Where to put return object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a control method.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDbExecuteMethod (
    ACPI_DB_METHOD_INFO     *Info,
    ACPI_BUFFER             *ReturnObj)
{
    ACPI_STATUS             Status;
    ACPI_OBJECT_LIST        ParamObjects;
    ACPI_OBJECT             Params[ACPI_DEBUGGER_MAX_ARGS + 1];
    UINT32                  i;


    ACPI_FUNCTION_TRACE (DbExecuteMethod);


    if (AcpiGbl_DbOutputToFile && !AcpiDbgLevel)
    {
        AcpiOsPrintf ("Warning: debug output is not enabled!\n");
    }

    ParamObjects.Count = 0;
    ParamObjects.Pointer = NULL;

    /* Pass through any command-line arguments */

    if (Info->Args && Info->Args[0])
    {
        /* Get arguments passed on the command line */

        for (i = 0; (Info->Args[i] && *(Info->Args[i])); i++)
        {
            /* Convert input string (token) to an actual ACPI_OBJECT */

            Status = AcpiDbConvertToObject (Info->Types[i],
                Info->Args[i], &Params[i]);
            if (ACPI_FAILURE (Status))
            {
                ACPI_EXCEPTION ((AE_INFO, Status,
                    "While parsing method arguments"));
                goto Cleanup;
            }
        }

        ParamObjects.Count = i;
        ParamObjects.Pointer = Params;
    }

    /* Prepare for a return object of arbitrary size */

    ReturnObj->Pointer = AcpiGbl_DbBuffer;
    ReturnObj->Length  = ACPI_DEBUG_BUFFER_SIZE;

    /* Do the actual method execution */

    AcpiGbl_MethodExecuting = TRUE;
    Status = AcpiEvaluateObject (NULL, Info->Pathname,
        &ParamObjects, ReturnObj);

    AcpiGbl_CmSingleStep = FALSE;
    AcpiGbl_MethodExecuting = FALSE;

    if (ACPI_FAILURE (Status))
    {
        if ((Status == AE_ABORT_METHOD) || AcpiGbl_AbortMethod)
        {
            /* Clear the abort and fall back to the debugger prompt */

            ACPI_EXCEPTION ((AE_INFO, Status,
                "Aborting top-level method"));

            AcpiGbl_AbortMethod = FALSE;
            Status = AE_OK;
            goto Cleanup;
        }

        ACPI_EXCEPTION ((AE_INFO, Status,
            "while executing %s from AML Debugger", Info->Pathname));

        if (Status == AE_BUFFER_OVERFLOW)
        {
            ACPI_ERROR ((AE_INFO,
                "Possible buffer overflow within AML Debugger "
                "buffer (size 0x%X needed 0x%X)",
                ACPI_DEBUG_BUFFER_SIZE, (UINT32) ReturnObj->Length));
        }
    }

Cleanup:
    AcpiDbDeleteObjects (ParamObjects.Count, Params);
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbExecuteSetup
 *
 * PARAMETERS:  Info            - Valid method info
 *
 * RETURN:      None
 *
 * DESCRIPTION: Setup info segment prior to method execution
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDbExecuteSetup (
    ACPI_DB_METHOD_INFO     *Info)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME (DbExecuteSetup);


    /* Concatenate the current scope to the supplied name */

    Info->Pathname[0] = 0;
    if ((Info->Name[0] != '\\') &&
        (Info->Name[0] != '/'))
    {
        if (AcpiUtSafeStrcat (Info->Pathname, sizeof (Info->Pathname),
            AcpiGbl_DbScopeBuf))
        {
            Status = AE_BUFFER_OVERFLOW;
            goto ErrorExit;
        }
    }

    if (AcpiUtSafeStrcat (Info->Pathname, sizeof (Info->Pathname),
        Info->Name))
    {
        Status = AE_BUFFER_OVERFLOW;
        goto ErrorExit;
    }

    AcpiDbPrepNamestring (Info->Pathname);

    AcpiDbSetOutputDestination (ACPI_DB_DUPLICATE_OUTPUT);
    AcpiOsPrintf ("Evaluating %s\n", Info->Pathname);

    if (Info->Flags & EX_SINGLE_STEP)
    {
        AcpiGbl_CmSingleStep = TRUE;
        AcpiDbSetOutputDestination (ACPI_DB_CONSOLE_OUTPUT);
    }

    else
    {
        /* No single step, allow redirection to a file */

        AcpiDbSetOutputDestination (ACPI_DB_REDIRECTABLE_OUTPUT);
    }

    return (AE_OK);

ErrorExit:

    ACPI_EXCEPTION ((AE_INFO, Status, "During setup for method execution"));
    return (Status);
}


#ifdef ACPI_DBG_TRACK_ALLOCATIONS
UINT32
AcpiDbGetCacheInfo (
    ACPI_MEMORY_LIST        *Cache)
{

    return (Cache->TotalAllocated - Cache->TotalFreed - Cache->CurrentDepth);
}
#endif

/*******************************************************************************
 *
 * FUNCTION:    AcpiDbGetOutstandingAllocations
 *
 * PARAMETERS:  None
 *
 * RETURN:      Current global allocation count minus cache entries
 *
 * DESCRIPTION: Determine the current number of "outstanding" allocations --
 *              those allocations that have not been freed and also are not
 *              in one of the various object caches.
 *
 ******************************************************************************/

#ifdef ACPI_DEBUG_OUTPUT
static UINT32
AcpiDbGetOutstandingAllocations (
    void)
{
    UINT32                  Outstanding = 0;

#ifdef ACPI_DBG_TRACK_ALLOCATIONS

    Outstanding += AcpiDbGetCacheInfo (AcpiGbl_StateCache);
    Outstanding += AcpiDbGetCacheInfo (AcpiGbl_PsNodeCache);
    Outstanding += AcpiDbGetCacheInfo (AcpiGbl_PsNodeExtCache);
    Outstanding += AcpiDbGetCacheInfo (AcpiGbl_OperandCache);
#endif

    return (Outstanding);
}
#endif


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbExecutionWalk
 *
 * PARAMETERS:  WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a control method. Name is relative to the current
 *              scope.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDbExecutionWalk (
    ACPI_HANDLE             ObjHandle,
    UINT32                  NestingLevel,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_NAMESPACE_NODE     *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;
    ACPI_BUFFER             ReturnObj;
    ACPI_STATUS             Status;


    ObjDesc = AcpiNsGetAttachedObject (Node);
    if (ObjDesc->Method.ParamCount)
    {
        return (AE_OK);
    }

    ReturnObj.Pointer = NULL;
    ReturnObj.Length = ACPI_ALLOCATE_BUFFER;

    AcpiNsPrintNodePathname (Node, "Evaluating");

    /* Do the actual method execution */

    AcpiOsPrintf ("\n");
    AcpiGbl_MethodExecuting = TRUE;

    Status = AcpiEvaluateObject (Node, NULL, NULL, &ReturnObj);

    AcpiOsPrintf ("Evaluation of [%4.4s] returned %s\n",
        AcpiUtGetNodeName (Node),
        AcpiFormatException (Status));

    AcpiGbl_MethodExecuting = FALSE;
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbExecute
 *
 * PARAMETERS:  Name                - Name of method to execute
 *              Args                - Parameters to the method
 *              Types               -
 *              Flags               - single step/no single step
 *
 * RETURN:      None
 *
 * DESCRIPTION: Execute a control method. Name is relative to the current
 *              scope.
 *
 ******************************************************************************/

void
AcpiDbExecute (
    char                    *Name,
    char                    **Args,
    ACPI_OBJECT_TYPE        *Types,
    UINT32                  Flags)
{
    ACPI_STATUS             Status;
    ACPI_BUFFER             ReturnObj;
    char                    *NameString;

#ifdef ACPI_DEBUG_OUTPUT
    UINT32                  PreviousAllocations;
    UINT32                  Allocations;
#endif


    /*
     * Allow one execution to be performed by debugger or single step
     * execution will be dead locked by the interpreter mutexes.
     */
    if (AcpiGbl_MethodExecuting)
    {
        AcpiOsPrintf ("Only one debugger execution is allowed.\n");
        return;
    }

#ifdef ACPI_DEBUG_OUTPUT
    /* Memory allocation tracking */

    PreviousAllocations = AcpiDbGetOutstandingAllocations ();
#endif

    if (*Name == '*')
    {
        (void) AcpiWalkNamespace (ACPI_TYPE_METHOD, ACPI_ROOT_OBJECT,
            ACPI_UINT32_MAX, AcpiDbExecutionWalk, NULL, NULL, NULL);
        return;
    }

    NameString = ACPI_ALLOCATE (strlen (Name) + 1);
    if (!NameString)
    {
        return;
    }

    memset (&AcpiGbl_DbMethodInfo, 0, sizeof (ACPI_DB_METHOD_INFO));
    strcpy (NameString, Name);
    AcpiUtStrupr (NameString);

    /* Subcommand to Execute all predefined names in the namespace */

    if (!strncmp (NameString, "PREDEF", 6))
    {
        AcpiDbEvaluatePredefinedNames ();
        ACPI_FREE (NameString);
        return;
    }

    AcpiGbl_DbMethodInfo.Name = NameString;
    AcpiGbl_DbMethodInfo.Args = Args;
    AcpiGbl_DbMethodInfo.Types = Types;
    AcpiGbl_DbMethodInfo.Flags = Flags;

    ReturnObj.Pointer = NULL;
    ReturnObj.Length = ACPI_ALLOCATE_BUFFER;

    Status = AcpiDbExecuteSetup (&AcpiGbl_DbMethodInfo);
    if (ACPI_FAILURE (Status))
    {
        ACPI_FREE (NameString);
        return;
    }

    /* Get the NS node, determines existence also */

    Status = AcpiGetHandle (NULL, AcpiGbl_DbMethodInfo.Pathname,
        &AcpiGbl_DbMethodInfo.Method);
    if (ACPI_SUCCESS (Status))
    {
        Status = AcpiDbExecuteMethod (&AcpiGbl_DbMethodInfo,
            &ReturnObj);
    }
    ACPI_FREE (NameString);

    /*
     * Allow any handlers in separate threads to complete.
     * (Such as Notify handlers invoked from AML executed above).
     */
    AcpiOsSleep ((UINT64) 10);

#ifdef ACPI_DEBUG_OUTPUT

    /* Memory allocation tracking */

    Allocations = AcpiDbGetOutstandingAllocations () - PreviousAllocations;

    AcpiDbSetOutputDestination (ACPI_DB_DUPLICATE_OUTPUT);

    if (Allocations > 0)
    {
        AcpiOsPrintf (
            "0x%X Outstanding allocations after evaluation of %s\n",
            Allocations, AcpiGbl_DbMethodInfo.Pathname);
    }
#endif

    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("Evaluation of %s failed with status %s\n",
            AcpiGbl_DbMethodInfo.Pathname,
            AcpiFormatException (Status));
    }
    else
    {
        /* Display a return object, if any */

        if (ReturnObj.Length)
        {
            AcpiOsPrintf (
                "Evaluation of %s returned object %p, "
                "external buffer length %X\n",
                AcpiGbl_DbMethodInfo.Pathname, ReturnObj.Pointer,
                (UINT32) ReturnObj.Length);

            AcpiDbDumpExternalObject (ReturnObj.Pointer, 1);

            /* Dump a _PLD buffer if present */

            if (ACPI_COMPARE_NAMESEG ((ACPI_CAST_PTR (ACPI_NAMESPACE_NODE,
                AcpiGbl_DbMethodInfo.Method)->Name.Ascii),
                METHOD_NAME__PLD))
            {
                AcpiDbDumpPldBuffer (ReturnObj.Pointer);
            }
        }
        else
        {
            AcpiOsPrintf ("No object was returned from evaluation of %s\n",
                AcpiGbl_DbMethodInfo.Pathname);
        }
    }

    AcpiDbSetOutputDestination (ACPI_DB_CONSOLE_OUTPUT);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbMethodThread
 *
 * PARAMETERS:  Context             - Execution info segment
 *
 * RETURN:      None
 *
 * DESCRIPTION: Debugger execute thread. Waits for a command line, then
 *              simply dispatches it.
 *
 ******************************************************************************/

static void ACPI_SYSTEM_XFACE
AcpiDbMethodThread (
    void                    *Context)
{
    ACPI_STATUS             Status;
    ACPI_DB_METHOD_INFO     *Info = Context;
    ACPI_DB_METHOD_INFO     LocalInfo;
    UINT32                  i;
    UINT8                   Allow;
    ACPI_BUFFER             ReturnObj;


    /*
     * AcpiGbl_DbMethodInfo.Arguments will be passed as method arguments.
     * Prevent AcpiGbl_DbMethodInfo from being modified by multiple threads
     * concurrently.
     *
     * Note: The arguments we are passing are used by the ASL test suite
     * (aslts). Do not change them without updating the tests.
     */
    (void) AcpiOsWaitSemaphore (Info->InfoGate, 1, ACPI_WAIT_FOREVER);

    if (Info->InitArgs)
    {
        AcpiDbUint32ToHexString (Info->NumCreated,
            Info->IndexOfThreadStr);
        AcpiDbUint32ToHexString ((UINT32) AcpiOsGetThreadId (),
            Info->IdOfThreadStr);
    }

    if (Info->Threads && (Info->NumCreated < Info->NumThreads))
    {
        Info->Threads[Info->NumCreated++] = AcpiOsGetThreadId();
    }

    LocalInfo = *Info;
    LocalInfo.Args = LocalInfo.Arguments;
    LocalInfo.Arguments[0] = LocalInfo.NumThreadsStr;
    LocalInfo.Arguments[1] = LocalInfo.IdOfThreadStr;
    LocalInfo.Arguments[2] = LocalInfo.IndexOfThreadStr;
    LocalInfo.Arguments[3] = NULL;

    LocalInfo.Types = LocalInfo.ArgTypes;

    (void) AcpiOsSignalSemaphore (Info->InfoGate, 1);

    for (i = 0; i < Info->NumLoops; i++)
    {
        Status = AcpiDbExecuteMethod (&LocalInfo, &ReturnObj);
        if (ACPI_FAILURE (Status))
        {
            AcpiOsPrintf ("%s During evaluation of %s at iteration %X\n",
                AcpiFormatException (Status), Info->Pathname, i);
            if (Status == AE_ABORT_METHOD)
            {
                break;
            }
        }

#if 0
        if ((i % 100) == 0)
        {
            AcpiOsPrintf ("%u loops, Thread 0x%x\n",
                i, AcpiOsGetThreadId ());
        }

        if (ReturnObj.Length)
        {
            AcpiOsPrintf ("Evaluation of %s returned object %p Buflen %X\n",
                Info->Pathname, ReturnObj.Pointer,
                (UINT32) ReturnObj.Length);
            AcpiDbDumpExternalObject (ReturnObj.Pointer, 1);
        }
#endif
    }

    /* Signal our completion */

    Allow = 0;
    (void) AcpiOsWaitSemaphore (Info->ThreadCompleteGate,
        1, ACPI_WAIT_FOREVER);
    Info->NumCompleted++;

    if (Info->NumCompleted == Info->NumThreads)
    {
        /* Do signal for main thread once only */
        Allow = 1;
    }

    (void) AcpiOsSignalSemaphore (Info->ThreadCompleteGate, 1);

    if (Allow)
    {
        Status = AcpiOsSignalSemaphore (Info->MainThreadGate, 1);
        if (ACPI_FAILURE (Status))
        {
            AcpiOsPrintf (
                "Could not signal debugger thread sync semaphore, %s\n",
                AcpiFormatException (Status));
        }
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbSingleExecutionThread
 *
 * PARAMETERS:  Context                 - Method info struct
 *
 * RETURN:      None
 *
 * DESCRIPTION: Create one thread and execute a method
 *
 ******************************************************************************/

static void ACPI_SYSTEM_XFACE
AcpiDbSingleExecutionThread (
    void                    *Context)
{
    ACPI_DB_METHOD_INFO     *Info = Context;
    ACPI_STATUS             Status;
    ACPI_BUFFER             ReturnObj;


    AcpiOsPrintf ("\n");

    Status = AcpiDbExecuteMethod (Info, &ReturnObj);
    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("%s During evaluation of %s\n",
            AcpiFormatException (Status), Info->Pathname);
        return;
    }

    /* Display a return object, if any */

    if (ReturnObj.Length)
    {
        AcpiOsPrintf ("Evaluation of %s returned object %p, "
            "external buffer length %X\n",
            AcpiGbl_DbMethodInfo.Pathname, ReturnObj.Pointer,
            (UINT32) ReturnObj.Length);

        AcpiDbDumpExternalObject (ReturnObj.Pointer, 1);
    }

    AcpiOsPrintf ("\nBackground thread completed\n%c ",
        ACPI_DEBUGGER_COMMAND_PROMPT);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbCreateExecutionThread
 *
 * PARAMETERS:  MethodNameArg           - Control method to execute
 *              Arguments               - Array of arguments to the method
 *              Types                   - Corresponding array of object types
 *
 * RETURN:      None
 *
 * DESCRIPTION: Create a single thread to evaluate a namespace object. Handles
 *              arguments passed on command line for control methods.
 *
 ******************************************************************************/

void
AcpiDbCreateExecutionThread (
    char                    *MethodNameArg,
    char                    **Arguments,
    ACPI_OBJECT_TYPE        *Types)
{
    ACPI_STATUS             Status;
    UINT32                  i;


    memset (&AcpiGbl_DbMethodInfo, 0, sizeof (ACPI_DB_METHOD_INFO));
    AcpiGbl_DbMethodInfo.Name = MethodNameArg;
    AcpiGbl_DbMethodInfo.InitArgs = 1;
    AcpiGbl_DbMethodInfo.Args = AcpiGbl_DbMethodInfo.Arguments;
    AcpiGbl_DbMethodInfo.Types = AcpiGbl_DbMethodInfo.ArgTypes;

    /* Setup method arguments, up to 7 (0-6) */

    for (i = 0; (i < ACPI_METHOD_NUM_ARGS) && *Arguments; i++)
    {
        AcpiGbl_DbMethodInfo.Arguments[i] = *Arguments;
        Arguments++;

        AcpiGbl_DbMethodInfo.ArgTypes[i] = *Types;
        Types++;
    }

    Status = AcpiDbExecuteSetup (&AcpiGbl_DbMethodInfo);
    if (ACPI_FAILURE (Status))
    {
        return;
    }

    /* Get the NS node, determines existence also */

    Status = AcpiGetHandle (NULL, AcpiGbl_DbMethodInfo.Pathname,
        &AcpiGbl_DbMethodInfo.Method);
    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("%s Could not get handle for %s\n",
            AcpiFormatException (Status), AcpiGbl_DbMethodInfo.Pathname);
        return;
    }

    Status = AcpiOsExecute (OSL_DEBUGGER_EXEC_THREAD,
        AcpiDbSingleExecutionThread, &AcpiGbl_DbMethodInfo);
    if (ACPI_FAILURE (Status))
    {
        return;
    }

    AcpiOsPrintf ("\nBackground thread started\n");
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbCreateExecutionThreads
 *
 * PARAMETERS:  NumThreadsArg           - Number of threads to create
 *              NumLoopsArg             - Loop count for the thread(s)
 *              MethodNameArg           - Control method to execute
 *
 * RETURN:      None
 *
 * DESCRIPTION: Create threads to execute method(s)
 *
 ******************************************************************************/

void
AcpiDbCreateExecutionThreads (
    char                    *NumThreadsArg,
    char                    *NumLoopsArg,
    char                    *MethodNameArg)
{
    ACPI_STATUS             Status;
    UINT32                  NumThreads;
    UINT32                  NumLoops;
    UINT32                  i;
    UINT32                  Size;
    ACPI_MUTEX              MainThreadGate;
    ACPI_MUTEX              ThreadCompleteGate;
    ACPI_MUTEX              InfoGate;


    /* Get the arguments */

    NumThreads = strtoul (NumThreadsArg, NULL, 0);
    NumLoops = strtoul (NumLoopsArg, NULL, 0);

    if (!NumThreads || !NumLoops)
    {
        AcpiOsPrintf ("Bad argument: Threads %X, Loops %X\n",
            NumThreads, NumLoops);
        return;
    }

    /*
     * Create the semaphore for synchronization of
     * the created threads with the main thread.
     */
    Status = AcpiOsCreateSemaphore (1, 0, &MainThreadGate);
    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("Could not create semaphore for "
            "synchronization with the main thread, %s\n",
            AcpiFormatException (Status));
        return;
    }

    /*
     * Create the semaphore for synchronization
     * between the created threads.
     */
    Status = AcpiOsCreateSemaphore (1, 1, &ThreadCompleteGate);
    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("Could not create semaphore for "
            "synchronization between the created threads, %s\n",
            AcpiFormatException (Status));

        (void) AcpiOsDeleteSemaphore (MainThreadGate);
        return;
    }

    Status = AcpiOsCreateSemaphore (1, 1, &InfoGate);
    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("Could not create semaphore for "
            "synchronization of AcpiGbl_DbMethodInfo, %s\n",
            AcpiFormatException (Status));

        (void) AcpiOsDeleteSemaphore (ThreadCompleteGate);
        (void) AcpiOsDeleteSemaphore (MainThreadGate);
        return;
    }

    memset (&AcpiGbl_DbMethodInfo, 0, sizeof (ACPI_DB_METHOD_INFO));

    /* Array to store IDs of threads */

    AcpiGbl_DbMethodInfo.NumThreads = NumThreads;
    Size = sizeof (ACPI_THREAD_ID) * AcpiGbl_DbMethodInfo.NumThreads;

    AcpiGbl_DbMethodInfo.Threads = AcpiOsAllocate (Size);
    if (AcpiGbl_DbMethodInfo.Threads == NULL)
    {
        AcpiOsPrintf ("No memory for thread IDs array\n");
        (void) AcpiOsDeleteSemaphore (MainThreadGate);
        (void) AcpiOsDeleteSemaphore (ThreadCompleteGate);
        (void) AcpiOsDeleteSemaphore (InfoGate);
        return;
    }
    memset (AcpiGbl_DbMethodInfo.Threads, 0, Size);

    /* Setup the context to be passed to each thread */

    AcpiGbl_DbMethodInfo.Name = MethodNameArg;
    AcpiGbl_DbMethodInfo.Flags = 0;
    AcpiGbl_DbMethodInfo.NumLoops = NumLoops;
    AcpiGbl_DbMethodInfo.MainThreadGate = MainThreadGate;
    AcpiGbl_DbMethodInfo.ThreadCompleteGate = ThreadCompleteGate;
    AcpiGbl_DbMethodInfo.InfoGate = InfoGate;

    /* Init arguments to be passed to method */

    AcpiGbl_DbMethodInfo.InitArgs = 1;
    AcpiGbl_DbMethodInfo.Args = AcpiGbl_DbMethodInfo.Arguments;
    AcpiGbl_DbMethodInfo.Arguments[0] = AcpiGbl_DbMethodInfo.NumThreadsStr;
    AcpiGbl_DbMethodInfo.Arguments[1] = AcpiGbl_DbMethodInfo.IdOfThreadStr;
    AcpiGbl_DbMethodInfo.Arguments[2] = AcpiGbl_DbMethodInfo.IndexOfThreadStr;
    AcpiGbl_DbMethodInfo.Arguments[3] = NULL;

    AcpiGbl_DbMethodInfo.Types = AcpiGbl_DbMethodInfo.ArgTypes;
    AcpiGbl_DbMethodInfo.ArgTypes[0] = ACPI_TYPE_INTEGER;
    AcpiGbl_DbMethodInfo.ArgTypes[1] = ACPI_TYPE_INTEGER;
    AcpiGbl_DbMethodInfo.ArgTypes[2] = ACPI_TYPE_INTEGER;

    AcpiDbUint32ToHexString (NumThreads, AcpiGbl_DbMethodInfo.NumThreadsStr);

    Status = AcpiDbExecuteSetup (&AcpiGbl_DbMethodInfo);
    if (ACPI_FAILURE (Status))
    {
        goto CleanupAndExit;
    }

    /* Get the NS node, determines existence also */

    Status = AcpiGetHandle (NULL, AcpiGbl_DbMethodInfo.Pathname,
        &AcpiGbl_DbMethodInfo.Method);
    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("%s Could not get handle for %s\n",
            AcpiFormatException (Status), AcpiGbl_DbMethodInfo.Pathname);
        goto CleanupAndExit;
    }

    /* Create the threads */

    AcpiOsPrintf ("Creating %X threads to execute %X times each\n",
        NumThreads, NumLoops);

    for (i = 0; i < (NumThreads); i++)
    {
        Status = AcpiOsExecute (OSL_DEBUGGER_EXEC_THREAD, AcpiDbMethodThread,
            &AcpiGbl_DbMethodInfo);
        if (ACPI_FAILURE (Status))
        {
            break;
        }
    }

    /* Wait for all threads to complete */

    (void) AcpiOsWaitSemaphore (MainThreadGate, 1, ACPI_WAIT_FOREVER);

    AcpiDbSetOutputDestination (ACPI_DB_DUPLICATE_OUTPUT);
    AcpiOsPrintf ("All threads (%X) have completed\n", NumThreads);
    AcpiDbSetOutputDestination (ACPI_DB_CONSOLE_OUTPUT);

CleanupAndExit:

    /* Cleanup and exit */

    (void) AcpiOsDeleteSemaphore (MainThreadGate);
    (void) AcpiOsDeleteSemaphore (ThreadCompleteGate);
    (void) AcpiOsDeleteSemaphore (InfoGate);

    AcpiOsFree (AcpiGbl_DbMethodInfo.Threads);
    AcpiGbl_DbMethodInfo.Threads = NULL;
}