xref: /freebsd-11-stable/sys/contrib/dev/acpica/components/debugger/dbnames.c

/*******************************************************************************
 *
 * Module Name: dbnames - Debugger commands for the acpi namespace
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2012, 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 <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/acdebug.h>


#ifdef ACPI_DEBUGGER

#define _COMPONENT          ACPI_CA_DEBUGGER
        ACPI_MODULE_NAME    ("dbnames")


/* Local prototypes */

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

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

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

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

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

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

/*
 * Arguments for the Objects command
 * These object types map directly to the ACPI_TYPES
 */
static ACPI_DB_ARGUMENT_INFO    AcpiDbObjectTypes [] =
{
    {"ANY"},
    {"INTEGERS"},
    {"STRINGS"},
    {"BUFFERS"},
    {"PACKAGES"},
    {"FIELDS"},
    {"DEVICES"},
    {"EVENTS"},
    {"METHODS"},
    {"MUTEXES"},
    {"REGIONS"},
    {"POWERRESOURCES"},
    {"PROCESSORS"},
    {"THERMALZONES"},
    {"BUFFERFIELDS"},
    {"DDBHANDLES"},
    {"DEBUG"},
    {"REGIONFIELDS"},
    {"BANKFIELDS"},
    {"INDEXFIELDS"},
    {"REFERENCES"},
    {"ALIAS"},
    {NULL}           /* Must be null terminated */
};


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbSetScope
 *
 * PARAMETERS:  Name                - New scope path
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Set the "current scope" as maintained by this utility.
 *              The scope is used as a prefix to ACPI paths.
 *
 ******************************************************************************/

void
AcpiDbSetScope (
    char                    *Name)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    if (!Name || Name[0] == 0)
    {
        AcpiOsPrintf ("Current scope: %s\n", AcpiGbl_DbScopeBuf);
        return;
    }

    AcpiDbPrepNamestring (Name);

    if (Name[0] == '\\')
    {
        /* Validate new scope from the root */

        Status = AcpiNsGetNode (AcpiGbl_RootNode, Name, ACPI_NS_NO_UPSEARCH,
                    &Node);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }

        ACPI_STRCPY (AcpiGbl_DbScopeBuf, Name);
        ACPI_STRCAT (AcpiGbl_DbScopeBuf, "\\");
    }
    else
    {
        /* Validate new scope relative to old scope */

        Status = AcpiNsGetNode (AcpiGbl_DbScopeNode, Name, ACPI_NS_NO_UPSEARCH,
                    &Node);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }

        ACPI_STRCAT (AcpiGbl_DbScopeBuf, Name);
        ACPI_STRCAT (AcpiGbl_DbScopeBuf, "\\");
    }

    AcpiGbl_DbScopeNode = Node;
    AcpiOsPrintf ("New scope: %s\n", AcpiGbl_DbScopeBuf);
    return;

ErrorExit:

    AcpiOsPrintf ("Could not attach scope: %s, %s\n",
        Name, AcpiFormatException (Status));
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbDumpNamespace
 *
 * PARAMETERS:  StartArg        - Node to begin namespace dump
 *              DepthArg        - Maximum tree depth to be dumped
 *
 * RETURN:      None
 *
 * DESCRIPTION: Dump entire namespace or a subtree. Each node is displayed
 *              with type and other information.
 *
 ******************************************************************************/

void
AcpiDbDumpNamespace (
    char                    *StartArg,
    char                    *DepthArg)
{
    ACPI_HANDLE             SubtreeEntry = AcpiGbl_RootNode;
    UINT32                  MaxDepth = ACPI_UINT32_MAX;


    /* No argument given, just start at the root and dump entire namespace */

    if (StartArg)
    {
        SubtreeEntry = AcpiDbConvertToNode (StartArg);
        if (!SubtreeEntry)
        {
            return;
        }

        /* Now we can check for the depth argument */

        if (DepthArg)
        {
            MaxDepth = ACPI_STRTOUL (DepthArg, NULL, 0);
        }
    }

    AcpiDbSetOutputDestination (ACPI_DB_DUPLICATE_OUTPUT);
    AcpiOsPrintf ("ACPI Namespace (from %4.4s (%p) subtree):\n",
        ((ACPI_NAMESPACE_NODE *) SubtreeEntry)->Name.Ascii, SubtreeEntry);

    /* Display the subtree */

    AcpiDbSetOutputDestination (ACPI_DB_REDIRECTABLE_OUTPUT);
    AcpiNsDumpObjects (ACPI_TYPE_ANY, ACPI_DISPLAY_SUMMARY, MaxDepth,
        ACPI_OWNER_ID_MAX, SubtreeEntry);
    AcpiDbSetOutputDestination (ACPI_DB_CONSOLE_OUTPUT);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbDumpNamespaceByOwner
 *
 * PARAMETERS:  OwnerArg        - Owner ID whose nodes will be displayed
 *              DepthArg        - Maximum tree depth to be dumped
 *
 * RETURN:      None
 *
 * DESCRIPTION: Dump elements of the namespace that are owned by the OwnerId.
 *
 ******************************************************************************/

void
AcpiDbDumpNamespaceByOwner (
    char                    *OwnerArg,
    char                    *DepthArg)
{
    ACPI_HANDLE             SubtreeEntry = AcpiGbl_RootNode;
    UINT32                  MaxDepth = ACPI_UINT32_MAX;
    ACPI_OWNER_ID           OwnerId;


    OwnerId = (ACPI_OWNER_ID) ACPI_STRTOUL (OwnerArg, NULL, 0);

    /* Now we can check for the depth argument */

    if (DepthArg)
    {
        MaxDepth = ACPI_STRTOUL (DepthArg, NULL, 0);
    }

    AcpiDbSetOutputDestination (ACPI_DB_DUPLICATE_OUTPUT);
    AcpiOsPrintf ("ACPI Namespace by owner %X:\n", OwnerId);

    /* Display the subtree */

    AcpiDbSetOutputDestination (ACPI_DB_REDIRECTABLE_OUTPUT);
    AcpiNsDumpObjects (ACPI_TYPE_ANY, ACPI_DISPLAY_SUMMARY, MaxDepth, OwnerId,
        SubtreeEntry);
    AcpiDbSetOutputDestination (ACPI_DB_CONSOLE_OUTPUT);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbWalkAndMatchName
 *
 * PARAMETERS:  Callback from WalkNamespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Find a particular name/names within the namespace. Wildcards
 *              are supported -- '?' matches any character.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDbWalkAndMatchName (
    ACPI_HANDLE             ObjHandle,
    UINT32                  NestingLevel,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_STATUS             Status;
    char                    *RequestedName = (char *) Context;
    UINT32                  i;
    ACPI_BUFFER             Buffer;
    ACPI_WALK_INFO          Info;


    /* Check for a name match */

    for (i = 0; i < 4; i++)
    {
        /* Wildcard support */

        if ((RequestedName[i] != '?') &&
            (RequestedName[i] != ((ACPI_NAMESPACE_NODE *) ObjHandle)->Name.Ascii[i]))
        {
            /* No match, just exit */

            return (AE_OK);
        }
    }

    /* Get the full pathname to this object */

    Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
    Status = AcpiNsHandleToPathname (ObjHandle, &Buffer);
    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("Could Not get pathname for object %p\n", ObjHandle);
    }
    else
    {
        Info.OwnerId = ACPI_OWNER_ID_MAX;
        Info.DebugLevel = ACPI_UINT32_MAX;
        Info.DisplayType = ACPI_DISPLAY_SUMMARY | ACPI_DISPLAY_SHORT;

        AcpiOsPrintf ("%32s", (char *) Buffer.Pointer);
        (void) AcpiNsDumpOneObject (ObjHandle, NestingLevel, &Info, NULL);
        ACPI_FREE (Buffer.Pointer);
    }

    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbFindNameInNamespace
 *
 * PARAMETERS:  NameArg         - The 4-character ACPI name to find.
 *                                wildcards are supported.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Search the namespace for a given name (with wildcards)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiDbFindNameInNamespace (
    char                    *NameArg)
{
    char                    AcpiName[5] = "____";
    char                    *AcpiNamePtr = AcpiName;


    if (ACPI_STRLEN (NameArg) > 4)
    {
        AcpiOsPrintf ("Name must be no longer than 4 characters\n");
        return (AE_OK);
    }

    /* Pad out name with underscores as necessary to create a 4-char name */

    AcpiUtStrupr (NameArg);
    while (*NameArg)
    {
        *AcpiNamePtr = *NameArg;
        AcpiNamePtr++;
        NameArg++;
    }

    /* Walk the namespace from the root */

    (void) AcpiWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
                        AcpiDbWalkAndMatchName, NULL, AcpiName, NULL);

    AcpiDbSetOutputDestination (ACPI_DB_CONSOLE_OUTPUT);
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbWalkForPredefinedNames
 *
 * PARAMETERS:  Callback from WalkNamespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Detect and display predefined ACPI names (names that start with
 *              an underscore)
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDbWalkForPredefinedNames (
    ACPI_HANDLE             ObjHandle,
    UINT32                  NestingLevel,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_NAMESPACE_NODE         *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;
    UINT32                      *Count = (UINT32 *) Context;
    const ACPI_PREDEFINED_INFO  *Predefined;
    const ACPI_PREDEFINED_INFO  *Package = NULL;
    char                        *Pathname;


    Predefined = AcpiNsCheckForPredefinedName (Node);
    if (!Predefined)
    {
        return (AE_OK);
    }

    Pathname = AcpiNsGetExternalPathname (Node);
    if (!Pathname)
    {
        return (AE_OK);
    }

    /* If method returns a package, the info is in the next table entry */

    if (Predefined->Info.ExpectedBtypes & ACPI_BTYPE_PACKAGE)
    {
        Package = Predefined + 1;
    }

    AcpiOsPrintf ("%-32s arg %X ret %2.2X", Pathname,
        Predefined->Info.ParamCount, Predefined->Info.ExpectedBtypes);

    if (Package)
    {
        AcpiOsPrintf (" PkgType %2.2X ObjType %2.2X Count %2.2X",
            Package->RetInfo.Type, Package->RetInfo.ObjectType1,
            Package->RetInfo.Count1);
    }

    AcpiOsPrintf("\n");

    AcpiNsCheckParameterCount (Pathname, Node, ACPI_UINT32_MAX, Predefined);
    ACPI_FREE (Pathname);
    (*Count)++;

    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbCheckPredefinedNames
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Validate all predefined names in the namespace
 *
 ******************************************************************************/

void
AcpiDbCheckPredefinedNames (
    void)
{
    UINT32                  Count = 0;


    /* Search all nodes in namespace */

    (void) AcpiWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
                AcpiDbWalkForPredefinedNames, NULL, (void *) &Count, NULL);

    AcpiOsPrintf ("Found %u predefined names in the namespace\n", Count);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbWalkForSpecificObjects
 *
 * PARAMETERS:  Callback from WalkNamespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Display short info about objects in the namespace
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDbWalkForSpecificObjects (
    ACPI_HANDLE             ObjHandle,
    UINT32                  NestingLevel,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_WALK_INFO          *Info = (ACPI_WALK_INFO *) Context;
    ACPI_BUFFER             Buffer;
    ACPI_STATUS             Status;


    Info->Count++;

    /* Get and display the full pathname to this object */

    Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
    Status = AcpiNsHandleToPathname (ObjHandle, &Buffer);
    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("Could Not get pathname for object %p\n", ObjHandle);
        return (AE_OK);
    }

    AcpiOsPrintf ("%32s", (char *) Buffer.Pointer);
    ACPI_FREE (Buffer.Pointer);

    /* Dump short info about the object */

    (void) AcpiNsDumpOneObject (ObjHandle, NestingLevel, Info, NULL);
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbDisplayObjects
 *
 * PARAMETERS:  ObjTypeArg          - Type of object to display
 *              DisplayCountArg     - Max depth to display
 *
 * RETURN:      None
 *
 * DESCRIPTION: Display objects in the namespace of the requested type
 *
 ******************************************************************************/

ACPI_STATUS
AcpiDbDisplayObjects (
    char                    *ObjTypeArg,
    char                    *DisplayCountArg)
{
    ACPI_WALK_INFO          Info;
    ACPI_OBJECT_TYPE        Type;


    /* Get the object type */

    Type = AcpiDbMatchArgument (ObjTypeArg, AcpiDbObjectTypes);
    if (Type == ACPI_TYPE_NOT_FOUND)
    {
        AcpiOsPrintf ("Invalid or unsupported argument\n");
        return (AE_OK);
    }

    AcpiDbSetOutputDestination (ACPI_DB_DUPLICATE_OUTPUT);
    AcpiOsPrintf (
        "Objects of type [%s] defined in the current ACPI Namespace:\n",
        AcpiUtGetTypeName (Type));

    AcpiDbSetOutputDestination (ACPI_DB_REDIRECTABLE_OUTPUT);

    Info.Count = 0;
    Info.OwnerId = ACPI_OWNER_ID_MAX;
    Info.DebugLevel = ACPI_UINT32_MAX;
    Info.DisplayType = ACPI_DISPLAY_SUMMARY | ACPI_DISPLAY_SHORT;

    /* Walk the namespace from the root */

    (void) AcpiWalkNamespace (Type, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
                AcpiDbWalkForSpecificObjects, NULL, (void *) &Info, NULL);

    AcpiOsPrintf (
        "\nFound %u objects of type [%s] in the current ACPI Namespace\n",
        Info.Count, AcpiUtGetTypeName (Type));

    AcpiDbSetOutputDestination (ACPI_DB_CONSOLE_OUTPUT);
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbIntegrityWalk
 *
 * PARAMETERS:  Callback from WalkNamespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Examine one NS node for valid values.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDbIntegrityWalk (
    ACPI_HANDLE             ObjHandle,
    UINT32                  NestingLevel,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_INTEGRITY_INFO     *Info = (ACPI_INTEGRITY_INFO *) Context;
    ACPI_NAMESPACE_NODE     *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;
    ACPI_OPERAND_OBJECT     *Object;
    BOOLEAN                 Alias = TRUE;


    Info->Nodes++;

    /* Verify the NS node, and dereference aliases */

    while (Alias)
    {
        if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
        {
            AcpiOsPrintf ("Invalid Descriptor Type for Node %p [%s] - is %2.2X should be %2.2X\n",
                Node, AcpiUtGetDescriptorName (Node), ACPI_GET_DESCRIPTOR_TYPE (Node),
                ACPI_DESC_TYPE_NAMED);
            return (AE_OK);
        }

        if ((Node->Type == ACPI_TYPE_LOCAL_ALIAS)  ||
            (Node->Type == ACPI_TYPE_LOCAL_METHOD_ALIAS))
        {
            Node = (ACPI_NAMESPACE_NODE *) Node->Object;
        }
        else
        {
            Alias = FALSE;
        }
    }

    if (Node->Type > ACPI_TYPE_LOCAL_MAX)
    {
        AcpiOsPrintf ("Invalid Object Type for Node %p, Type = %X\n",
            Node, Node->Type);
        return (AE_OK);
    }

    if (!AcpiUtValidAcpiName (Node->Name.Integer))
    {
        AcpiOsPrintf ("Invalid AcpiName for Node %p\n", Node);
        return (AE_OK);
    }

    Object = AcpiNsGetAttachedObject (Node);
    if (Object)
    {
        Info->Objects++;
        if (ACPI_GET_DESCRIPTOR_TYPE (Object) != ACPI_DESC_TYPE_OPERAND)
        {
            AcpiOsPrintf ("Invalid Descriptor Type for Object %p [%s]\n",
                Object, AcpiUtGetDescriptorName (Object));
        }
    }

    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbCheckIntegrity
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Check entire namespace for data structure integrity
 *
 ******************************************************************************/

void
AcpiDbCheckIntegrity (
    void)
{
    ACPI_INTEGRITY_INFO     Info = {0,0};

    /* Search all nodes in namespace */

    (void) AcpiWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
                    AcpiDbIntegrityWalk, NULL, (void *) &Info, NULL);

    AcpiOsPrintf ("Verified %u namespace nodes with %u Objects\n",
        Info.Nodes, Info.Objects);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbWalkForReferences
 *
 * PARAMETERS:  Callback from WalkNamespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check if this namespace object refers to the target object
 *              that is passed in as the context value.
 *
 * Note: Currently doesn't check subobjects within the Node's object
 *
 ******************************************************************************/

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


    /* Check for match against the namespace node itself */

    if (Node == (void *) ObjDesc)
    {
        AcpiOsPrintf ("Object is a Node [%4.4s]\n",
            AcpiUtGetNodeName (Node));
    }

    /* Check for match against the object attached to the node */

    if (AcpiNsGetAttachedObject (Node) == ObjDesc)
    {
        AcpiOsPrintf ("Reference at Node->Object %p [%4.4s]\n",
            Node, AcpiUtGetNodeName (Node));
    }

    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbFindReferences
 *
 * PARAMETERS:  ObjectArg       - String with hex value of the object
 *
 * RETURN:      None
 *
 * DESCRIPTION: Search namespace for all references to the input object
 *
 ******************************************************************************/

void
AcpiDbFindReferences (
    char                    *ObjectArg)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;


    /* Convert string to object pointer */

    ObjDesc = ACPI_TO_POINTER (ACPI_STRTOUL (ObjectArg, NULL, 16));

    /* Search all nodes in namespace */

    (void) AcpiWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
                    AcpiDbWalkForReferences, NULL, (void *) ObjDesc, NULL);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbBusWalk
 *
 * PARAMETERS:  Callback from WalkNamespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Display info about device objects that have a corresponding
 *              _PRT method.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDbBusWalk (
    ACPI_HANDLE             ObjHandle,
    UINT32                  NestingLevel,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_NAMESPACE_NODE     *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;
    ACPI_STATUS             Status;
    ACPI_BUFFER             Buffer;
    ACPI_NAMESPACE_NODE     *TempNode;
    ACPI_DEVICE_INFO        *Info;
    UINT32                  i;


    if ((Node->Type != ACPI_TYPE_DEVICE) &&
        (Node->Type != ACPI_TYPE_PROCESSOR))
    {
        return (AE_OK);
    }

    /* Exit if there is no _PRT under this device */

    Status = AcpiGetHandle (Node, METHOD_NAME__PRT,
                ACPI_CAST_PTR (ACPI_HANDLE, &TempNode));
    if (ACPI_FAILURE (Status))
    {
        return (AE_OK);
    }

    /* Get the full path to this device object */

    Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
    Status = AcpiNsHandleToPathname (ObjHandle, &Buffer);
    if (ACPI_FAILURE (Status))
    {
        AcpiOsPrintf ("Could Not get pathname for object %p\n", ObjHandle);
        return (AE_OK);
    }

    Status = AcpiGetObjectInfo (ObjHandle, &Info);
    if (ACPI_FAILURE (Status))
    {
        return (AE_OK);
    }

    /* Display the full path */

    AcpiOsPrintf ("%-32s Type %X", (char *) Buffer.Pointer, Node->Type);
    ACPI_FREE (Buffer.Pointer);

    if (Info->Flags & ACPI_PCI_ROOT_BRIDGE)
    {
        AcpiOsPrintf ("  - Is PCI Root Bridge");
    }
    AcpiOsPrintf ("\n");

    /* _PRT info */

    AcpiOsPrintf ("_PRT: %p\n", TempNode);

    /* Dump _ADR, _HID, _UID, _CID */

    if (Info->Valid & ACPI_VALID_ADR)
    {
        AcpiOsPrintf ("_ADR: %8.8X%8.8X\n", ACPI_FORMAT_UINT64 (Info->Address));
    }
    else
    {
        AcpiOsPrintf ("_ADR: <Not Present>\n");
    }

    if (Info->Valid & ACPI_VALID_HID)
    {
        AcpiOsPrintf ("_HID: %s\n", Info->HardwareId.String);
    }
    else
    {
        AcpiOsPrintf ("_HID: <Not Present>\n");
    }

    if (Info->Valid & ACPI_VALID_UID)
    {
        AcpiOsPrintf ("_UID: %s\n", Info->UniqueId.String);
    }
    else
    {
        AcpiOsPrintf ("_UID: <Not Present>\n");
    }

    if (Info->Valid & ACPI_VALID_CID)
    {
        for (i = 0; i < Info->CompatibleIdList.Count; i++)
        {
            AcpiOsPrintf ("_CID: %s\n",
                Info->CompatibleIdList.Ids[i].String);
        }
    }
    else
    {
        AcpiOsPrintf ("_CID: <Not Present>\n");
    }

    ACPI_FREE (Info);
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDbGetBusInfo
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Display info about system busses.
 *
 ******************************************************************************/

void
AcpiDbGetBusInfo (
    void)
{
    /* Search all nodes in namespace */

    (void) AcpiWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
                    AcpiDbBusWalk, NULL, NULL, NULL);
}

#endif /* ACPI_DEBUGGER */