LXR 6.1/​bsps/​shared/​acpi/​acpica/​events/​evhandler.c	Source navigation Diff markup Identifier search General search
	Version: 6.1 Revert   Change

File indexing completed on 2025-05-11 08:24:02

 /******************************************************************************
  *
  * Module Name: evhandler - Support for Address Space handlers
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2024, 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 "acpi.h"
 #include "accommon.h"
 #include "acevents.h"
 #include "acnamesp.h"
 #include "acinterp.h"
 
 #define _COMPONENT          ACPI_EVENTS
         ACPI_MODULE_NAME    ("evhandler")
 
 
 /* Local prototypes */
 
 static ACPI_STATUS
 AcpiEvInstallHandler (
     ACPI_HANDLE             ObjHandle,
     UINT32                  Level,
     void                    *Context,
     void                    **ReturnValue);
 
 
 /* These are the address spaces that will get default handlers */
 
 UINT8        AcpiGbl_DefaultAddressSpaces[ACPI_NUM_DEFAULT_SPACES] =
 {
     ACPI_ADR_SPACE_SYSTEM_MEMORY,
     ACPI_ADR_SPACE_SYSTEM_IO,
     ACPI_ADR_SPACE_PCI_CONFIG,
     ACPI_ADR_SPACE_DATA_TABLE
 };
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvInstallRegionHandlers
  *
  * PARAMETERS:  None
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Installs the core subsystem default address space handlers.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiEvInstallRegionHandlers (
     void)
 {
     ACPI_STATUS             Status;
     UINT32                  i;
 
 
     ACPI_FUNCTION_TRACE (EvInstallRegionHandlers);
 
 
     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     /*
      * All address spaces (PCI Config, EC, SMBus) are scope dependent and
      * registration must occur for a specific device.
      *
      * In the case of the system memory and IO address spaces there is
      * currently no device associated with the address space. For these we
      * use the root.
      *
      * We install the default PCI config space handler at the root so that
      * this space is immediately available even though the we have not
      * enumerated all the PCI Root Buses yet. This is to conform to the ACPI
      * specification which states that the PCI config space must be always
      * available -- even though we are nowhere near ready to find the PCI root
      * buses at this point.
      *
      * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
      * has already been installed (via AcpiInstallAddressSpaceHandler).
      * Similar for AE_SAME_HANDLER.
      */
     for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++)
     {
         Status = AcpiEvInstallSpaceHandler (AcpiGbl_RootNode,
             AcpiGbl_DefaultAddressSpaces[i],
             ACPI_DEFAULT_HANDLER, NULL, NULL);
         switch (Status)
         {
         case AE_OK:
         case AE_SAME_HANDLER:
         case AE_ALREADY_EXISTS:
 
             /* These exceptions are all OK */
 
             Status = AE_OK;
             break;
 
         default:
 
             goto UnlockAndExit;
         }
     }
 
 UnlockAndExit:
     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvHasDefaultHandler
  *
  * PARAMETERS:  Node                - Namespace node for the device
  *              SpaceId             - The address space ID
  *
  * RETURN:      TRUE if default handler is installed, FALSE otherwise
  *
  * DESCRIPTION: Check if the default handler is installed for the requested
  *              space ID.
  *
  ******************************************************************************/
 
 BOOLEAN
 AcpiEvHasDefaultHandler (
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_ADR_SPACE_TYPE     SpaceId)
 {
     ACPI_OPERAND_OBJECT     *ObjDesc;
     ACPI_OPERAND_OBJECT     *HandlerObj;
 
 
     /* Must have an existing internal object */
 
     ObjDesc = AcpiNsGetAttachedObject (Node);
     if (ObjDesc)
     {
         HandlerObj = ObjDesc->CommonNotify.Handler;
 
         /* Walk the linked list of handlers for this object */
 
         while (HandlerObj)
         {
             if (HandlerObj->AddressSpace.SpaceId == SpaceId)
             {
                 if (HandlerObj->AddressSpace.HandlerFlags &
                     ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)
                 {
                     return (TRUE);
                 }
             }
 
             HandlerObj = HandlerObj->AddressSpace.Next;
         }
     }
 
     return (FALSE);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvInstallHandler
  *
  * PARAMETERS:  WalkNamespace callback
  *
  * DESCRIPTION: This routine installs an address handler into objects that are
  *              of type Region or Device.
  *
  *              If the Object is a Device, and the device has a handler of
  *              the same type then the search is terminated in that branch.
  *
  *              This is because the existing handler is closer in proximity
  *              to any more regions than the one we are trying to install.
  *
  ******************************************************************************/
 
 static ACPI_STATUS
 AcpiEvInstallHandler (
     ACPI_HANDLE             ObjHandle,
     UINT32                  Level,
     void                    *Context,
     void                    **ReturnValue)
 {
     ACPI_OPERAND_OBJECT     *HandlerObj;
     ACPI_OPERAND_OBJECT     *NextHandlerObj;
     ACPI_OPERAND_OBJECT     *ObjDesc;
     ACPI_NAMESPACE_NODE     *Node;
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_NAME (EvInstallHandler);
 
 
     HandlerObj = (ACPI_OPERAND_OBJECT  *) Context;
 
     /* Parameter validation */
 
     if (!HandlerObj)
     {
         return (AE_OK);
     }
 
     /* Convert and validate the device handle */
 
     Node = AcpiNsValidateHandle (ObjHandle);
     if (!Node)
     {
         return (AE_BAD_PARAMETER);
     }
 
     /*
      * We only care about regions and objects that are allowed to have
      * address space handlers
      */
     if ((Node->Type != ACPI_TYPE_DEVICE) &&
         (Node->Type != ACPI_TYPE_REGION) &&
         (Node != AcpiGbl_RootNode))
     {
         return (AE_OK);
     }
 
     /* Check for an existing internal object */
 
     ObjDesc = AcpiNsGetAttachedObject (Node);
     if (!ObjDesc)
     {
         /* No object, just exit */
 
         return (AE_OK);
     }
 
     /* Devices are handled different than regions */
 
     if (ObjDesc->Common.Type == ACPI_TYPE_DEVICE)
     {
         /* Check if this Device already has a handler for this address space */
 
         NextHandlerObj = AcpiEvFindRegionHandler (
             HandlerObj->AddressSpace.SpaceId, ObjDesc->CommonNotify.Handler);
         if (NextHandlerObj)
         {
             /* Found a handler, is it for the same address space? */
 
             ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
                 "Found handler for region [%s] in device %p(%p) handler %p\n",
                 AcpiUtGetRegionName (HandlerObj->AddressSpace.SpaceId),
                 ObjDesc, NextHandlerObj, HandlerObj));
 
             /*
              * Since the object we found it on was a device, then it means
              * that someone has already installed a handler for the branch
              * of the namespace from this device on. Just bail out telling
              * the walk routine to not traverse this branch. This preserves
              * the scoping rule for handlers.
              */
             return (AE_CTRL_DEPTH);
         }
 
         /*
          * As long as the device didn't have a handler for this space we
          * don't care about it. We just ignore it and proceed.
          */
         return (AE_OK);
     }
 
     /* Object is a Region */
 
     if (ObjDesc->Region.SpaceId != HandlerObj->AddressSpace.SpaceId)
     {
         /* This region is for a different address space, just ignore it */
 
         return (AE_OK);
     }
 
     /*
      * Now we have a region and it is for the handler's address space type.
      *
      * First disconnect region for any previous handler (if any)
      */
     AcpiEvDetachRegion (ObjDesc, FALSE);
 
     /* Connect the region to the new handler */
 
     Status = AcpiEvAttachRegion (HandlerObj, ObjDesc, FALSE);
     return (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvFindRegionHandler
  *
  * PARAMETERS:  SpaceId         - The address space ID
  *              HandlerObj      - Head of the handler object list
  *
  * RETURN:      Matching handler object. NULL if space ID not matched
  *
  * DESCRIPTION: Search a handler object list for a match on the address
  *              space ID.
  *
  ******************************************************************************/
 
 ACPI_OPERAND_OBJECT *
 AcpiEvFindRegionHandler (
     ACPI_ADR_SPACE_TYPE     SpaceId,
     ACPI_OPERAND_OBJECT     *HandlerObj)
 {
 
     /* Walk the handler list for this device */
 
     while (HandlerObj)
     {
         /* Same SpaceId indicates a handler is installed */
 
         if (HandlerObj->AddressSpace.SpaceId == SpaceId)
         {
             return (HandlerObj);
         }
 
         /* Next handler object */
 
         HandlerObj = HandlerObj->AddressSpace.Next;
     }
 
     return (NULL);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvInstallSpaceHandler
  *
  * PARAMETERS:  Node            - Namespace node for the device
  *              SpaceId         - The address space ID
  *              Handler         - Address of the handler
  *              Setup           - Address of the setup function
  *              Context         - Value passed to the handler on each access
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Install a handler for all OpRegions of a given SpaceId.
  *              Assumes namespace is locked
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiEvInstallSpaceHandler (
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_ADR_SPACE_TYPE     SpaceId,
     ACPI_ADR_SPACE_HANDLER  Handler,
     ACPI_ADR_SPACE_SETUP    Setup,
     void                    *Context)
 {
     ACPI_OPERAND_OBJECT     *ObjDesc;
     ACPI_OPERAND_OBJECT     *HandlerObj;
     ACPI_STATUS             Status = AE_OK;
     ACPI_OBJECT_TYPE        Type;
     UINT8                   Flags = 0;
 
 
     ACPI_FUNCTION_TRACE (EvInstallSpaceHandler);
 
 
     /*
      * This registration is valid for only the types below and the root.
      * The root node is where the default handlers get installed.
      */
     if ((Node->Type != ACPI_TYPE_DEVICE)     &&
         (Node->Type != ACPI_TYPE_PROCESSOR)  &&
         (Node->Type != ACPI_TYPE_THERMAL)    &&
         (Node != AcpiGbl_RootNode))
     {
         Status = AE_BAD_PARAMETER;
         goto UnlockAndExit;
     }
 
     if (Handler == ACPI_DEFAULT_HANDLER)
     {
         Flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
 
         switch (SpaceId)
         {
         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 
             Handler = AcpiExSystemMemorySpaceHandler;
             Setup   = AcpiEvSystemMemoryRegionSetup;
             break;
 
         case ACPI_ADR_SPACE_SYSTEM_IO:
 
             Handler = AcpiExSystemIoSpaceHandler;
             Setup   = AcpiEvIoSpaceRegionSetup;
             break;
 
         case ACPI_ADR_SPACE_PCI_CONFIG:
 
             Handler = AcpiExPciConfigSpaceHandler;
             Setup   = AcpiEvPciConfigRegionSetup;
             break;
 
         case ACPI_ADR_SPACE_CMOS:
 
             Handler = AcpiExCmosSpaceHandler;
             Setup   = AcpiEvCmosRegionSetup;
             break;
 
         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
 
             Handler = AcpiExPciBarSpaceHandler;
             Setup   = AcpiEvPciBarRegionSetup;
             break;
 
         case ACPI_ADR_SPACE_DATA_TABLE:
 
             Handler = AcpiExDataTableSpaceHandler;
             Setup   = AcpiEvDataTableRegionSetup;
             break;
 
         default:
 
             Status = AE_BAD_PARAMETER;
             goto UnlockAndExit;
         }
     }
 
     /* If the caller hasn't specified a setup routine, use the default */
 
     if (!Setup)
     {
         Setup = AcpiEvDefaultRegionSetup;
     }
 
     /* Check for an existing internal object */
 
     ObjDesc = AcpiNsGetAttachedObject (Node);
     if (ObjDesc)
     {
         /*
          * The attached device object already exists. Now make sure
          * the handler is not already installed.
          */
         HandlerObj = AcpiEvFindRegionHandler (SpaceId,
             ObjDesc->CommonNotify.Handler);
 
         if (HandlerObj)
         {
             if (HandlerObj->AddressSpace.Handler == Handler)
             {
                 /*
                  * It is (relatively) OK to attempt to install the SAME
                  * handler twice. This can easily happen with the
                  * PCI_Config space.
                  */
                 Status = AE_SAME_HANDLER;
                 goto UnlockAndExit;
             }
             else
             {
                 /* A handler is already installed */
 
                 Status = AE_ALREADY_EXISTS;
             }
 
             goto UnlockAndExit;
         }
     }
     else
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
             "Creating object on Device %p while installing handler\n",
             Node));
 
         /* ObjDesc does not exist, create one */
 
         if (Node->Type == ACPI_TYPE_ANY)
         {
             Type = ACPI_TYPE_DEVICE;
         }
         else
         {
             Type = Node->Type;
         }
 
         ObjDesc = AcpiUtCreateInternalObject (Type);
         if (!ObjDesc)
         {
             Status = AE_NO_MEMORY;
             goto UnlockAndExit;
         }
 
         /* Init new descriptor */
 
         ObjDesc->Common.Type = (UINT8) Type;
 
         /* Attach the new object to the Node */
 
         Status = AcpiNsAttachObject (Node, ObjDesc, Type);
 
         /* Remove local reference to the object */
 
         AcpiUtRemoveReference (ObjDesc);
 
         if (ACPI_FAILURE (Status))
         {
             goto UnlockAndExit;
         }
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
         "Installing address handler for region %s(%X) "
         "on Device %4.4s %p(%p)\n",
         AcpiUtGetRegionName (SpaceId), SpaceId,
         AcpiUtGetNodeName (Node), Node, ObjDesc));
 
     /*
      * Install the handler
      *
      * At this point there is no existing handler. Just allocate the object
      * for the handler and link it into the list.
      */
     HandlerObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
     if (!HandlerObj)
     {
         Status = AE_NO_MEMORY;
         goto UnlockAndExit;
     }
 
     /* Init handler obj */
 
     Status = AcpiOsCreateMutex (&HandlerObj->AddressSpace.ContextMutex);
     if (ACPI_FAILURE (Status))
     {
         AcpiUtRemoveReference (HandlerObj);
         goto UnlockAndExit;
     }
 
     HandlerObj->AddressSpace.SpaceId = (UINT8) SpaceId;
     HandlerObj->AddressSpace.HandlerFlags = Flags;
     HandlerObj->AddressSpace.RegionList = NULL;
     HandlerObj->AddressSpace.Node = Node;
     HandlerObj->AddressSpace.Handler = Handler;
     HandlerObj->AddressSpace.Context = Context;
     HandlerObj->AddressSpace.Setup = Setup;
 
     /* Install at head of Device.AddressSpace list */
 
     HandlerObj->AddressSpace.Next = ObjDesc->CommonNotify.Handler;
 
     /*
      * The Device object is the first reference on the HandlerObj.
      * Each region that uses the handler adds a reference.
      */
     ObjDesc->CommonNotify.Handler = HandlerObj;
 
     /*
      * Walk the namespace finding all of the regions this handler will
      * manage.
      *
      * Start at the device and search the branch toward the leaf nodes
      * until either the leaf is encountered or a device is detected that
      * has an address handler of the same type.
      *
      * In either case, back up and search down the remainder of the branch
      */
     Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, Node,
         ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
         AcpiEvInstallHandler, NULL, HandlerObj, NULL);
 
 UnlockAndExit:
     return_ACPI_STATUS (Status);
 }

This page was automatically generated by the 2.3.7 LXR engine. The LXR team