Subversion Repositories or1k

/******************************************************************************

 *

 * Module Name: evgpeblk - GPE block creation and initialization.

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2004, R. Byron Moore

 * 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/acpi.h>

#include <acpi/acevents.h>

#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_EVENTS

         ACPI_MODULE_NAME    ("evgpeblk")

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_valid_gpe_event

 *

 * PARAMETERS:  gpe_event_info - Info for this GPE

 *

 * RETURN:      TRUE if the gpe_event is valid

 *

 * DESCRIPTION: Validate a GPE event.  DO NOT CALL FROM INTERRUPT LEVEL.

 *              Should be called only when the GPE lists are semaphore locked

 *              and not subject to change.

 *

 ******************************************************************************/

u8

acpi_ev_valid_gpe_event (

        struct acpi_gpe_event_info      *gpe_event_info)

{

        struct acpi_gpe_xrupt_info      *gpe_xrupt_block;

        struct acpi_gpe_block_info      *gpe_block;

        ACPI_FUNCTION_ENTRY ();

        /* No need for spin lock since we are not changing any list elements */

        /* Walk the GPE interrupt levels */

        gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;

        while (gpe_xrupt_block) {

                gpe_block = gpe_xrupt_block->gpe_block_list_head;

                /* Walk the GPE blocks on this interrupt level */

                while (gpe_block) {

                        if ((&gpe_block->event_info[0] <= gpe_event_info) &&

                                (&gpe_block->event_info[((acpi_size) gpe_block->register_count) * 8] > gpe_event_info)) {

                                return (TRUE);

                        }

                        gpe_block = gpe_block->next;

                }

                gpe_xrupt_block = gpe_xrupt_block->next;

        }

        return (FALSE);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_walk_gpe_list

 *

 * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Walk the GPE lists.

 *              FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED

 *

 ******************************************************************************/

acpi_status

acpi_ev_walk_gpe_list (

        ACPI_GPE_CALLBACK       gpe_walk_callback)

{

        struct acpi_gpe_block_info      *gpe_block;

        struct acpi_gpe_xrupt_info      *gpe_xrupt_info;

        acpi_status                     status = AE_OK;

        ACPI_FUNCTION_TRACE ("ev_walk_gpe_list");

        acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_ISR);

        /* Walk the interrupt level descriptor list */

        gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;

        while (gpe_xrupt_info) {

                /* Walk all Gpe Blocks attached to this interrupt level */

                gpe_block = gpe_xrupt_info->gpe_block_list_head;

                while (gpe_block) {

                        /* One callback per GPE block */

                        status = gpe_walk_callback (gpe_xrupt_info, gpe_block);

                        if (ACPI_FAILURE (status)) {

                                goto unlock_and_exit;

                        }

                        gpe_block = gpe_block->next;

                }

                gpe_xrupt_info = gpe_xrupt_info->next;

        }

unlock_and_exit:

        acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_ISR);

        return_ACPI_STATUS (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_save_method_info

 *

 * PARAMETERS:  Callback from walk_namespace

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a

 *              control method under the _GPE portion of the namespace.

 *              Extract the name and GPE type from the object, saving this

 *              information for quick lookup during GPE dispatch

 *

 *              The name of each GPE control method is of the form:

 *              "_Lxx" or "_Exx"

 *              Where:

 *                  L      - means that the GPE is level triggered

 *                  E      - means that the GPE is edge triggered

 *                  xx     - is the GPE number [in HEX]

 *

 ******************************************************************************/

static acpi_status

acpi_ev_save_method_info (

        acpi_handle                     obj_handle,

        u32                             level,

        void                            *obj_desc,

        void                            **return_value)

{

        struct acpi_gpe_block_info      *gpe_block = (void *) obj_desc;

        struct acpi_gpe_event_info      *gpe_event_info;

        u32                             gpe_number;

        char                            name[ACPI_NAME_SIZE + 1];

        u8                              type;

        ACPI_FUNCTION_TRACE ("ev_save_method_info");

        /*

         * _Lxx and _Exx GPE method support

         *

         * 1) Extract the name from the object and convert to a string

         */

        ACPI_MOVE_32_TO_32 (name,

                           &((struct acpi_namespace_node *) obj_handle)->name.integer);

        name[ACPI_NAME_SIZE] = 0;

        /*

         * 2) Edge/Level determination is based on the 2nd character

         *    of the method name

         *

         * NOTE: Default GPE type is RUNTIME.  May be changed later to WAKE if a

         * _PRW object is found that points to this GPE.

         */

        switch (name[1]) {

        case 'L':

                type = ACPI_GPE_LEVEL_TRIGGERED | ACPI_GPE_TYPE_RUNTIME;

                break;

        case 'E':

                type = ACPI_GPE_EDGE_TRIGGERED | ACPI_GPE_TYPE_RUNTIME;

                break;

        default:

                /* Unknown method type, just ignore it! */

                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,

                        "Unknown GPE method type: %s (name not of form _Lxx or _Exx)\n",

                        name));

                return_ACPI_STATUS (AE_OK);

        }

        /* Convert the last two characters of the name to the GPE Number */

        gpe_number = ACPI_STRTOUL (&name[2], NULL, 16);

        if (gpe_number == ACPI_UINT32_MAX) {

                /* Conversion failed; invalid method, just ignore it */

                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,

                        "Could not extract GPE number from name: %s (name is not of form _Lxx or _Exx)\n",

                        name));

                return_ACPI_STATUS (AE_OK);

        }

        /* Ensure that we have a valid GPE number for this GPE block */

        if ((gpe_number < gpe_block->block_base_number) ||

                (gpe_number >= (gpe_block->block_base_number + (gpe_block->register_count * 8)))) {

                /*

                 * Not valid for this GPE block, just ignore it

                 * However, it may be valid for a different GPE block, since GPE0 and GPE1

                 * methods both appear under \_GPE.

                 */

                return_ACPI_STATUS (AE_OK);

        }

        /*

         * Now we can add this information to the gpe_event_info block

         * for use during dispatch of this GPE.

         */

        gpe_event_info = &gpe_block->event_info[gpe_number - gpe_block->block_base_number];

        gpe_event_info->flags    = type;

        gpe_event_info->method_node = (struct acpi_namespace_node *) obj_handle;

        ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,

                "Registered GPE method %s as GPE number 0x%.2X\n",

                name, gpe_number));

        return_ACPI_STATUS (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_get_gpe_type

 *

 * PARAMETERS:  Callback from walk_namespace

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a

 *              Device.  Run the _PRW method.  If present, extract the GPE

 *              number and mark the GPE as a WAKE GPE.

 *

 ******************************************************************************/

static acpi_status

acpi_ev_get_gpe_type (

        acpi_handle                     obj_handle,

        u32                             level,

        void                            *info,

        void                            **return_value)

{

        struct acpi_gpe_walk_info       *gpe_info = (void *) info;

        struct acpi_namespace_node      *gpe_device;

        struct acpi_gpe_block_info      *gpe_block;

        struct acpi_namespace_node      *target_gpe_device;

        struct acpi_gpe_event_info      *gpe_event_info;

        union acpi_operand_object       *pkg_desc;

        union acpi_operand_object       *obj_desc;

        u32                             gpe_number;

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("ev_get_gpe_type");

        /* Check for a _PRW method under this device */

        status = acpi_ut_evaluate_object (obj_handle, METHOD_NAME__PRW,

                         ACPI_BTYPE_PACKAGE, &pkg_desc);

        if (status == AE_NOT_FOUND) {

                return_ACPI_STATUS (AE_OK);

        }

        else if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        /* The returned _PRW package must have at least two elements */

        if (pkg_desc->package.count < 2) {

                goto cleanup;

        }

        /* Extract pointers from the input context */

        gpe_device = gpe_info->gpe_device;

        gpe_block = gpe_info->gpe_block;

        /*

         * The _PRW object must return a package, we are only interested

         * in the first element

         */

        obj_desc = pkg_desc->package.elements[0];

        if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_INTEGER) {

                /* Use FADT-defined GPE device (from definition of _PRW) */

                target_gpe_device = acpi_gbl_fadt_gpe_device;

                /* Integer is the GPE number in the FADT described GPE blocks */

                gpe_number = (u32) obj_desc->integer.value;

        }

        else if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_PACKAGE) {

                /* Package contains a GPE reference and GPE number within a GPE block */

                if ((obj_desc->package.count < 2) ||

                        (ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[0]) != ACPI_TYPE_LOCAL_REFERENCE) ||

                        (ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[1]) != ACPI_TYPE_INTEGER)) {

                        goto cleanup;

                }

                /* Get GPE block reference and decode */

                target_gpe_device = obj_desc->package.elements[0]->reference.node;

                gpe_number = (u32) obj_desc->package.elements[1]->integer.value;

        }

        else {

                /* Unknown type, just ignore it */

                goto cleanup;

        }

        /*

         * Is this GPE within this block?

         *

         * TRUE iff these conditions are true:

         *     1) The GPE devices match.

         *     2) The GPE index(number) is within the range of the Gpe Block

         *          associated with the GPE device.

         */

        if ((gpe_device == target_gpe_device) &&

                (gpe_number >= gpe_block->block_base_number) &&

                (gpe_number < gpe_block->block_base_number + (gpe_block->register_count * 8))) {

                /* Mark GPE for WAKE but DISABLED (even for wake) */

                gpe_event_info = &gpe_block->event_info[gpe_number - gpe_block->block_base_number];

                gpe_event_info->flags |= ACPI_GPE_TYPE_WAKE;

        }

cleanup:

        acpi_ut_remove_reference (pkg_desc);

        return_ACPI_STATUS (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_get_gpe_xrupt_block

 *

 * PARAMETERS:  interrupt_level     - Interrupt for a GPE block

 *

 * RETURN:      A GPE interrupt block

 *

 * DESCRIPTION: Get or Create a GPE interrupt block.  There is one interrupt

 *              block per unique interrupt level used for GPEs.

 *              Should be called only when the GPE lists are semaphore locked

 *              and not subject to change.

 *

 ******************************************************************************/

static struct acpi_gpe_xrupt_info *

acpi_ev_get_gpe_xrupt_block (

        u32                             interrupt_level)

{

        struct acpi_gpe_xrupt_info      *next_gpe_xrupt;

        struct acpi_gpe_xrupt_info      *gpe_xrupt;

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("ev_get_gpe_xrupt_block");

        /* No need for spin lock since we are not changing any list elements here */

        next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;

        while (next_gpe_xrupt) {

                if (next_gpe_xrupt->interrupt_level == interrupt_level) {

                        return_PTR (next_gpe_xrupt);

                }

                next_gpe_xrupt = next_gpe_xrupt->next;

        }

        /* Not found, must allocate a new xrupt descriptor */

        gpe_xrupt = ACPI_MEM_CALLOCATE (sizeof (struct acpi_gpe_xrupt_info));

        if (!gpe_xrupt) {

                return_PTR (NULL);

        }

        gpe_xrupt->interrupt_level = interrupt_level;

        /* Install new interrupt descriptor with spin lock */

        acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);

        if (acpi_gbl_gpe_xrupt_list_head) {

                next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;

                while (next_gpe_xrupt->next) {

                        next_gpe_xrupt = next_gpe_xrupt->next;

                }

                next_gpe_xrupt->next = gpe_xrupt;

                gpe_xrupt->previous = next_gpe_xrupt;

        }

        else {

                acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;

        }

        acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);

        /* Install new interrupt handler if not SCI_INT */

        if (interrupt_level != acpi_gbl_FADT->sci_int) {

                status = acpi_os_install_interrupt_handler (interrupt_level,

                                 acpi_ev_gpe_xrupt_handler, gpe_xrupt);

                if (ACPI_FAILURE (status)) {

                        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,

                                "Could not install GPE interrupt handler at level 0x%X\n",

                                interrupt_level));

                        return_PTR (NULL);

                }

        }

        return_PTR (gpe_xrupt);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_delete_gpe_xrupt

 *

 * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated

 *              interrupt handler if not the SCI interrupt.

 *

 ******************************************************************************/

static acpi_status

acpi_ev_delete_gpe_xrupt (

        struct acpi_gpe_xrupt_info      *gpe_xrupt)

{

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("ev_delete_gpe_xrupt");

        /* We never want to remove the SCI interrupt handler */

        if (gpe_xrupt->interrupt_level == acpi_gbl_FADT->sci_int) {

                gpe_xrupt->gpe_block_list_head = NULL;

                return_ACPI_STATUS (AE_OK);

        }

        /* Disable this interrupt */

        status = acpi_os_remove_interrupt_handler (gpe_xrupt->interrupt_level,

                           acpi_ev_gpe_xrupt_handler);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        /* Unlink the interrupt block with lock */

        acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);

        if (gpe_xrupt->previous) {

                gpe_xrupt->previous->next = gpe_xrupt->next;

        }

        if (gpe_xrupt->next) {

                gpe_xrupt->next->previous = gpe_xrupt->previous;

        }

        acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);

        /* Free the block */

        ACPI_MEM_FREE (gpe_xrupt);

        return_ACPI_STATUS (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_install_gpe_block

 *

 * PARAMETERS:  gpe_block       - New GPE block

 *              interrupt_level - Level to be associated with this GPE block

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install new GPE block with mutex support

 *

 ******************************************************************************/

static acpi_status

acpi_ev_install_gpe_block (

        struct acpi_gpe_block_info      *gpe_block,

        u32                             interrupt_level)

{

        struct acpi_gpe_block_info      *next_gpe_block;

        struct acpi_gpe_xrupt_info      *gpe_xrupt_block;

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("ev_install_gpe_block");

        status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block (interrupt_level);

        if (!gpe_xrupt_block) {

                status = AE_NO_MEMORY;

                goto unlock_and_exit;

        }

        /* Install the new block at the end of the list for this interrupt with lock */

        acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);

        if (gpe_xrupt_block->gpe_block_list_head) {

                next_gpe_block = gpe_xrupt_block->gpe_block_list_head;

                while (next_gpe_block->next) {

                        next_gpe_block = next_gpe_block->next;

                }

                next_gpe_block->next = gpe_block;

                gpe_block->previous = next_gpe_block;

        }

        else {

                gpe_xrupt_block->gpe_block_list_head = gpe_block;

        }

        gpe_block->xrupt_block = gpe_xrupt_block;

        acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);

unlock_and_exit:

        status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);

        return_ACPI_STATUS (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_delete_gpe_block

 *

 * PARAMETERS:  gpe_block       - Existing GPE block

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove a GPE block

 *

 ******************************************************************************/

acpi_status

acpi_ev_delete_gpe_block (

        struct acpi_gpe_block_info      *gpe_block)

{

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("ev_install_gpe_block");

        status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        /* Disable all GPEs in this block */

        status = acpi_hw_disable_gpe_block (gpe_block->xrupt_block, gpe_block);

        if (!gpe_block->previous && !gpe_block->next) {

                /* This is the last gpe_block on this interrupt */

                status = acpi_ev_delete_gpe_xrupt (gpe_block->xrupt_block);

                if (ACPI_FAILURE (status)) {

                        goto unlock_and_exit;

                }

        }

        else {

                /* Remove the block on this interrupt with lock */

                acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);

                if (gpe_block->previous) {

                        gpe_block->previous->next = gpe_block->next;

                }

                else {

                        gpe_block->xrupt_block->gpe_block_list_head = gpe_block->next;

                }

                if (gpe_block->next) {

                        gpe_block->next->previous = gpe_block->previous;

                }

                acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);

        }

        /* Free the gpe_block */

        ACPI_MEM_FREE (gpe_block->register_info);

        ACPI_MEM_FREE (gpe_block->event_info);

        ACPI_MEM_FREE (gpe_block);

unlock_and_exit:

        status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);

        return_ACPI_STATUS (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_create_gpe_info_blocks

 *

 * PARAMETERS:  gpe_block   - New GPE block

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Create the register_info and event_info blocks for this GPE block

 *

 ******************************************************************************/

static acpi_status

acpi_ev_create_gpe_info_blocks (

        struct acpi_gpe_block_info      *gpe_block)

{

        struct acpi_gpe_register_info   *gpe_register_info = NULL;

        struct acpi_gpe_event_info      *gpe_event_info = NULL;

        struct acpi_gpe_event_info      *this_event;

        struct acpi_gpe_register_info   *this_register;

        acpi_native_uint                i;

        acpi_native_uint                j;

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("ev_create_gpe_info_blocks");

        /* Allocate the GPE register information block */

        gpe_register_info = ACPI_MEM_CALLOCATE (

                          (acpi_size) gpe_block->register_count *

                          sizeof (struct acpi_gpe_register_info));

        if (!gpe_register_info) {

                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,

                        "Could not allocate the gpe_register_info table\n"));

                return_ACPI_STATUS (AE_NO_MEMORY);

        }

        /*

         * Allocate the GPE event_info block. There are eight distinct GPEs

         * per register.  Initialization to zeros is sufficient.

         */

        gpe_event_info = ACPI_MEM_CALLOCATE (

                           ((acpi_size) gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH) *

                           sizeof (struct acpi_gpe_event_info));

        if (!gpe_event_info) {

                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not allocate the gpe_event_info table\n"));

                status = AE_NO_MEMORY;

                goto error_exit;

        }

        /* Save the new Info arrays in the GPE block */

        gpe_block->register_info = gpe_register_info;

        gpe_block->event_info  = gpe_event_info;

        /*

         * 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.

         */

        this_register = gpe_register_info;

        this_event   = gpe_event_info;

        for (i = 0; i < gpe_block->register_count; i++) {

                /* Init the register_info for this GPE register (8 GPEs) */

                this_register->base_gpe_number = (u8) (gpe_block->block_base_number +

                                   (i * ACPI_GPE_REGISTER_WIDTH));

                ACPI_STORE_ADDRESS (this_register->status_address.address,

                                 (gpe_block->block_address.address

                                 + i));

                ACPI_STORE_ADDRESS (this_register->enable_address.address,

                                 (gpe_block->block_address.address

                                 + i

                                 + gpe_block->register_count));

                this_register->status_address.address_space_id = gpe_block->block_address.address_space_id;

                this_register->enable_address.address_space_id = gpe_block->block_address.address_space_id;

                this_register->status_address.register_bit_width = ACPI_GPE_REGISTER_WIDTH;

                this_register->enable_address.register_bit_width = ACPI_GPE_REGISTER_WIDTH;

                this_register->status_address.register_bit_offset = ACPI_GPE_REGISTER_WIDTH;

                this_register->enable_address.register_bit_offset = ACPI_GPE_REGISTER_WIDTH;

                /* Init the event_info for each GPE within this register */

                for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {

                        this_event->bit_mask = acpi_gbl_decode_to8bit[j];

                        this_event->register_info = this_register;

                        this_event++;

                }

                /*

                 * Clear the status/enable registers.  Note that status registers

                 * are cleared by writing a '1', while enable registers are cleared

                 * by writing a '0'.

                 */

                status = acpi_hw_low_level_write (ACPI_GPE_REGISTER_WIDTH, 0x00,

                                 &this_register->enable_address);

                if (ACPI_FAILURE (status)) {

                        goto error_exit;

                }

                status = acpi_hw_low_level_write (ACPI_GPE_REGISTER_WIDTH, 0xFF,

                                 &this_register->status_address);