FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/events/evgpeblk.c

     /******************************************************************************
      *
      * Module Name: evgpeblk - GPE block creation and initialization.
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, 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 <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/acevents.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   
   #define _COMPONENT          ACPI_EVENTS
           ACPI_MODULE_NAME    ("evgpeblk")
   
   #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
   
   /* Local prototypes */
   
   static ACPI_STATUS
   AcpiEvInstallGpeBlock (
       ACPI_GPE_BLOCK_INFO     *GpeBlock,
       UINT32                  InterruptNumber);
   
   static ACPI_STATUS
   AcpiEvCreateGpeInfoBlocks (
       ACPI_GPE_BLOCK_INFO     *GpeBlock);
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiEvInstallGpeBlock
    *
    * PARAMETERS:  GpeBlock                - New GPE block
    *              InterruptNumber         - Xrupt to be associated with this
    *                                        GPE block
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Install new GPE block with mutex support
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   AcpiEvInstallGpeBlock (
       ACPI_GPE_BLOCK_INFO     *GpeBlock,
       UINT32                  InterruptNumber)
   {
       ACPI_GPE_BLOCK_INFO     *NextGpeBlock;
       ACPI_GPE_XRUPT_INFO     *GpeXruptBlock;
       ACPI_STATUS             Status;
       ACPI_CPU_FLAGS          Flags;
   
   
       ACPI_FUNCTION_TRACE (EvInstallGpeBlock);
   
   
       Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       Status = AcpiEvGetGpeXruptBlock (InterruptNumber, &GpeXruptBlock);
       if (ACPI_FAILURE (Status))
       {
           goto UnlockAndExit;
       }
   
       /* Install the new block at the end of the list with lock */
   
       Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
       if (GpeXruptBlock->GpeBlockListHead)
       {
           NextGpeBlock = GpeXruptBlock->GpeBlockListHead;
           while (NextGpeBlock->Next)
           {
               NextGpeBlock = NextGpeBlock->Next;
           }
   
           NextGpeBlock->Next = GpeBlock;
           GpeBlock->Previous = NextGpeBlock;
       }
       else
       {
           GpeXruptBlock->GpeBlockListHead = GpeBlock;
       }
   
       GpeBlock->XruptBlock = GpeXruptBlock;
       AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
   
   
   UnlockAndExit:
       (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiEvDeleteGpeBlock
    *
    * PARAMETERS:  GpeBlock            - Existing GPE block
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Remove a GPE block
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiEvDeleteGpeBlock (
       ACPI_GPE_BLOCK_INFO     *GpeBlock)
   {
       ACPI_STATUS             Status;
       ACPI_CPU_FLAGS          Flags;
   
   
       ACPI_FUNCTION_TRACE (EvInstallGpeBlock);
   
   
       Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /* Disable all GPEs in this block */
   
       Status = AcpiHwDisableGpeBlock (GpeBlock->XruptBlock, GpeBlock, NULL);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       if (!GpeBlock->Previous && !GpeBlock->Next)
       {
           /* This is the last GpeBlock on this interrupt */
   
           Status = AcpiEvDeleteGpeXrupt (GpeBlock->XruptBlock);
           if (ACPI_FAILURE (Status))
           {
               goto UnlockAndExit;
           }
       }
       else
       {
           /* Remove the block on this interrupt with lock */
   
           Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
           if (GpeBlock->Previous)
           {
               GpeBlock->Previous->Next = GpeBlock->Next;
           }
           else
           {
               GpeBlock->XruptBlock->GpeBlockListHead = GpeBlock->Next;
           }
   
           if (GpeBlock->Next)
           {
               GpeBlock->Next->Previous = GpeBlock->Previous;
           }
   
           AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
       }
   
       AcpiCurrentGpeCount -= GpeBlock->GpeCount;
   
       /* Free the GpeBlock */
   
       ACPI_FREE (GpeBlock->RegisterInfo);
       ACPI_FREE (GpeBlock->EventInfo);
       ACPI_FREE (GpeBlock);
   
   UnlockAndExit:
       Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiEvCreateGpeInfoBlocks
    *
    * PARAMETERS:  GpeBlock    - New GPE block
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Create the RegisterInfo and EventInfo blocks for this GPE block
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   AcpiEvCreateGpeInfoBlocks (
       ACPI_GPE_BLOCK_INFO     *GpeBlock)
   {
       ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo = NULL;
       ACPI_GPE_EVENT_INFO     *GpeEventInfo = NULL;
       ACPI_GPE_EVENT_INFO     *ThisEvent;
       ACPI_GPE_REGISTER_INFO  *ThisRegister;
       UINT32                  i;
       UINT32                  j;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (EvCreateGpeInfoBlocks);
   
   
       /* Allocate the GPE register information block */
   
       GpeRegisterInfo = ACPI_ALLOCATE_ZEROED (
           (ACPI_SIZE) GpeBlock->RegisterCount *
           sizeof (ACPI_GPE_REGISTER_INFO));
       if (!GpeRegisterInfo)
       {
           ACPI_ERROR ((AE_INFO,
               "Could not allocate the GpeRegisterInfo table"));
           return_ACPI_STATUS (AE_NO_MEMORY);
       }
   
       /*
        * Allocate the GPE EventInfo block. There are eight distinct GPEs
        * per register. Initialization to zeros is sufficient.
        */
       GpeEventInfo = ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) GpeBlock->GpeCount *
           sizeof (ACPI_GPE_EVENT_INFO));
       if (!GpeEventInfo)
       {
           ACPI_ERROR ((AE_INFO,
               "Could not allocate the GpeEventInfo table"));
           Status = AE_NO_MEMORY;
           goto ErrorExit;
       }
   
       /* Save the new Info arrays in the GPE block */
   
       GpeBlock->RegisterInfo = GpeRegisterInfo;
       GpeBlock->EventInfo = GpeEventInfo;
   
       /*
        * Initialize the GPE Register and Event structures. A goal of these
        * tables is to hide the fact that there are two separate GPE register
        * sets in a given GPE hardware block, the status registers occupy the
        * first half, and the enable registers occupy the second half.
        */
       ThisRegister = GpeRegisterInfo;
       ThisEvent = GpeEventInfo;
   
       for (i = 0; i < GpeBlock->RegisterCount; i++)
       {
           /* Init the RegisterInfo for this GPE register (8 GPEs) */
   
           ThisRegister->BaseGpeNumber = (UINT16)
               (GpeBlock->BlockBaseNumber + (i * ACPI_GPE_REGISTER_WIDTH));
   
           ThisRegister->StatusAddress.Address =
               GpeBlock->Address + i;
   
           ThisRegister->EnableAddress.Address =
               GpeBlock->Address + i + GpeBlock->RegisterCount;
   
           ThisRegister->StatusAddress.SpaceId   = GpeBlock->SpaceId;
           ThisRegister->EnableAddress.SpaceId   = GpeBlock->SpaceId;
           ThisRegister->StatusAddress.BitWidth  = ACPI_GPE_REGISTER_WIDTH;
           ThisRegister->EnableAddress.BitWidth  = ACPI_GPE_REGISTER_WIDTH;
           ThisRegister->StatusAddress.BitOffset = 0;
           ThisRegister->EnableAddress.BitOffset = 0;
   
           /* Init the EventInfo for each GPE within this register */
   
           for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
           {
               ThisEvent->GpeNumber = (UINT8) (ThisRegister->BaseGpeNumber + j);
               ThisEvent->RegisterInfo = ThisRegister;
               ThisEvent++;
           }
   
           /* Disable all GPEs within this register */
   
           Status = AcpiHwWrite (0x00, &ThisRegister->EnableAddress);
           if (ACPI_FAILURE (Status))
           {
               goto ErrorExit;
           }
   
           /* Clear any pending GPE events within this register */
   
           Status = AcpiHwWrite (0xFF, &ThisRegister->StatusAddress);
           if (ACPI_FAILURE (Status))
           {
               goto ErrorExit;
           }
   
           ThisRegister++;
       }
   
       return_ACPI_STATUS (AE_OK);
   
   
   ErrorExit:
       if (GpeRegisterInfo)
       {
           ACPI_FREE (GpeRegisterInfo);
       }
       if (GpeEventInfo)
       {
           ACPI_FREE (GpeEventInfo);
       }
   
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiEvCreateGpeBlock
    *
    * PARAMETERS:  GpeDevice           - Handle to the parent GPE block
    *              GpeBlockAddress     - Address and SpaceID
    *              RegisterCount       - Number of GPE register pairs in the block
    *              GpeBlockBaseNumber  - Starting GPE number for the block
    *              InterruptNumber     - H/W interrupt for the block
    *              ReturnGpeBlock      - Where the new block descriptor is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
    *              the block are disabled at exit.
    *              Note: Assumes namespace is locked.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiEvCreateGpeBlock (
       ACPI_NAMESPACE_NODE     *GpeDevice,
       UINT64                  Address,
       UINT8                   SpaceId,
       UINT32                  RegisterCount,
       UINT16                  GpeBlockBaseNumber,
       UINT32                  InterruptNumber,
       ACPI_GPE_BLOCK_INFO     **ReturnGpeBlock)
   {
       ACPI_STATUS             Status;
       ACPI_GPE_BLOCK_INFO     *GpeBlock;
       ACPI_GPE_WALK_INFO      WalkInfo;
   
   
       ACPI_FUNCTION_TRACE (EvCreateGpeBlock);
   
   
       if (!RegisterCount)
       {
           return_ACPI_STATUS (AE_OK);
       }
   
       /* Allocate a new GPE block */
   
       GpeBlock = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_BLOCK_INFO));
       if (!GpeBlock)
       {
           return_ACPI_STATUS (AE_NO_MEMORY);
       }
   
       /* Initialize the new GPE block */
   
       GpeBlock->Address = Address;
       GpeBlock->SpaceId = SpaceId;
       GpeBlock->Node = GpeDevice;
       GpeBlock->GpeCount = (UINT16) (RegisterCount * ACPI_GPE_REGISTER_WIDTH);
       GpeBlock->Initialized = FALSE;
       GpeBlock->RegisterCount = RegisterCount;
       GpeBlock->BlockBaseNumber = GpeBlockBaseNumber;
   
       /*
        * Create the RegisterInfo and EventInfo sub-structures
        * Note: disables and clears all GPEs in the block
        */
       Status = AcpiEvCreateGpeInfoBlocks (GpeBlock);
       if (ACPI_FAILURE (Status))
       {
           ACPI_FREE (GpeBlock);
           return_ACPI_STATUS (Status);
       }
   
       /* Install the new block in the global lists */
   
       Status = AcpiEvInstallGpeBlock (GpeBlock, InterruptNumber);
       if (ACPI_FAILURE (Status))
       {
           ACPI_FREE (GpeBlock->RegisterInfo);
           ACPI_FREE (GpeBlock->EventInfo);
           ACPI_FREE (GpeBlock);
           return_ACPI_STATUS (Status);
       }
   
       AcpiGbl_AllGpesInitialized = FALSE;
   
       /* Find all GPE methods (_Lxx or_Exx) for this block */
   
       WalkInfo.GpeBlock = GpeBlock;
       WalkInfo.GpeDevice = GpeDevice;
       WalkInfo.ExecuteByOwnerId = FALSE;
   
       (void) AcpiNsWalkNamespace (ACPI_TYPE_METHOD, GpeDevice,
           ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
           AcpiEvMatchGpeMethod, NULL, &WalkInfo, NULL);
   
       /* Return the new block */
   
       if (ReturnGpeBlock)
       {
           (*ReturnGpeBlock) = GpeBlock;
       }
   
       ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
           "    Initialized GPE %02X to %02X [%4.4s] %u regs on interrupt 0x%X%s\n",
           (UINT32) GpeBlock->BlockBaseNumber,
           (UINT32) (GpeBlock->BlockBaseNumber + (GpeBlock->GpeCount - 1)),
           GpeDevice->Name.Ascii, GpeBlock->RegisterCount, InterruptNumber,
           InterruptNumber == AcpiGbl_FADT.SciInterrupt ? " (SCI)" : ""));
   
       /* Update global count of currently available GPEs */
   
       AcpiCurrentGpeCount += GpeBlock->GpeCount;
       return_ACPI_STATUS (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiEvInitializeGpeBlock
    *
    * PARAMETERS:  ACPI_GPE_CALLBACK
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Initialize and enable a GPE block. Enable GPEs that have
    *              associated methods.
    *              Note: Assumes namespace is locked.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiEvInitializeGpeBlock (
       ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
       ACPI_GPE_BLOCK_INFO     *GpeBlock,
       void                    *Context)
   {
       ACPI_STATUS             Status;
       ACPI_GPE_EVENT_INFO     *GpeEventInfo;
       UINT32                  GpeEnabledCount;
       UINT32                  GpeIndex;
       UINT32                  i;
       UINT32                  j;
       BOOLEAN                 *IsPollingNeeded = Context;
       ACPI_ERROR_ONLY (UINT32 GpeNumber);
   
   
       ACPI_FUNCTION_TRACE (EvInitializeGpeBlock);
   
   
       /*
        * Ignore a null GPE block (e.g., if no GPE block 1 exists), and
        * any GPE blocks that have been initialized already.
        */
       if (!GpeBlock || GpeBlock->Initialized)
       {
           return_ACPI_STATUS (AE_OK);
       }
   
       /*
        * Enable all GPEs that have a corresponding method and have the
        * ACPI_GPE_CAN_WAKE flag unset. Any other GPEs within this block
        * must be enabled via the acpi_enable_gpe() interface.
        */
       GpeEnabledCount = 0;
   
       for (i = 0; i < GpeBlock->RegisterCount; i++)
       {
           for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
           {
               /* Get the info block for this particular GPE */
   
               GpeIndex = (i * ACPI_GPE_REGISTER_WIDTH) + j;
               GpeEventInfo = &GpeBlock->EventInfo[GpeIndex];
               ACPI_ERROR_ONLY(GpeNumber = GpeBlock->BlockBaseNumber + GpeIndex);
               GpeEventInfo->Flags |= ACPI_GPE_INITIALIZED;
   
               /*
                * Ignore GPEs that have no corresponding _Lxx/_Exx method
                * and GPEs that are used to wake the system
                */
               if ((ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) != ACPI_GPE_DISPATCH_METHOD) ||
                   (GpeEventInfo->Flags & ACPI_GPE_CAN_WAKE))
               {
                   continue;
               }
   
               Status = AcpiEvAddGpeReference (GpeEventInfo, FALSE);
               if (ACPI_FAILURE (Status))
               {
                   ACPI_EXCEPTION ((AE_INFO, Status,
                       "Could not enable GPE 0x%02X",
                       GpeNumber));
                   continue;
               }
   
               GpeEventInfo->Flags |= ACPI_GPE_AUTO_ENABLED;
   
               if (IsPollingNeeded &&
                   ACPI_GPE_IS_POLLING_NEEDED (GpeEventInfo))
               {
                   *IsPollingNeeded = TRUE;
               }
   
               GpeEnabledCount++;
           }
       }
   
       if (GpeEnabledCount)
       {
           ACPI_INFO ((
               "Enabled %u GPEs in block %02X to %02X", GpeEnabledCount,
               (UINT32) GpeBlock->BlockBaseNumber,
               (UINT32) (GpeBlock->BlockBaseNumber + (GpeBlock->GpeCount - 1))));
       }
   
       GpeBlock->Initialized = TRUE;
       return_ACPI_STATUS (AE_OK);
   }
   
   #endif /* !ACPI_REDUCED_HARDWARE */

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