SSL evgpe.c   Interaktion und
PortierbarkeitC

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: evgpe - General Purpose Event handling and dispatch
 *
 * Copyright (C) 2000 - 2025, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evgpe")
#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
/* Local prototypes */
static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_update_gpe_enable_mask
 *
 * PARAMETERS:  gpe_event_info          - GPE to update
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Updates GPE register enable mask based upon whether there are
 *              runtime references to this GPE
 *
 ******************************************************************************/

acpi_status
acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
{
 struct acpi_gpe_register_info *gpe_register_info;
 u32 register_bit;

 ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask);

 gpe_register_info = gpe_event_info->register_info;
 if (!gpe_register_info) {
  return_ACPI_STATUS(AE_NOT_EXIST);
 }

 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);

 /* Clear the run bit up front */

 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);

 /* Set the mask bit only if there are references to this GPE */

 if (gpe_event_info->runtime_count) {
  ACPI_SET_BIT(gpe_register_info->enable_for_run,
        (u8)register_bit);
 }

 gpe_register_info->enable_mask = gpe_register_info->enable_for_run;
 return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_enable_gpe
 *
 * PARAMETERS:  gpe_event_info          - GPE to enable
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable a GPE.
 *
 ******************************************************************************/

acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
 acpi_status status;

 ACPI_FUNCTION_TRACE(ev_enable_gpe);

 /* Enable the requested GPE */

 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
 return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_mask_gpe
 *
 * PARAMETERS:  gpe_event_info          - GPE to be blocked/unblocked
 *              is_masked               - Whether the GPE is masked or not
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Unconditionally mask/unmask a GPE during runtime.
 *
 ******************************************************************************/

acpi_status
acpi_ev_mask_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 is_masked)
{
 struct acpi_gpe_register_info *gpe_register_info;
 u32 register_bit;

 ACPI_FUNCTION_TRACE(ev_mask_gpe);

 gpe_register_info = gpe_event_info->register_info;
 if (!gpe_register_info) {
  return_ACPI_STATUS(AE_NOT_EXIST);
 }

 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);

 /* Perform the action */

 if (is_masked) {
  if (register_bit & gpe_register_info->mask_for_run) {
   return_ACPI_STATUS(AE_BAD_PARAMETER);
  }

  (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
  ACPI_SET_BIT(gpe_register_info->mask_for_run, (u8)register_bit);
 } else {
  if (!(register_bit & gpe_register_info->mask_for_run)) {
   return_ACPI_STATUS(AE_BAD_PARAMETER);
  }

  ACPI_CLEAR_BIT(gpe_register_info->mask_for_run,
          (u8)register_bit);
  if (gpe_event_info->runtime_count
      && !gpe_event_info->disable_for_dispatch) {
   (void)acpi_hw_low_set_gpe(gpe_event_info,
        ACPI_GPE_ENABLE);
  }
 }

 return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_add_gpe_reference
 *
 * PARAMETERS:  gpe_event_info          - Add a reference to this GPE
 *              clear_on_enable         - Clear GPE status before enabling it
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 *              hardware-enabled.
 *
 ******************************************************************************/

acpi_status
acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info,
     u8 clear_on_enable)
{
 acpi_status status = AE_OK;

 ACPI_FUNCTION_TRACE(ev_add_gpe_reference);

 if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
  return_ACPI_STATUS(AE_LIMIT);
 }

 gpe_event_info->runtime_count++;
 if (gpe_event_info->runtime_count == 1) {

  /* Enable on first reference */

  if (clear_on_enable) {
   (void)acpi_hw_clear_gpe(gpe_event_info);
  }

  status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
  if (ACPI_SUCCESS(status)) {
   status = acpi_ev_enable_gpe(gpe_event_info);
  }

  if (ACPI_FAILURE(status)) {
   gpe_event_info->runtime_count--;
  }
 }

 return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_remove_gpe_reference
 *
 * PARAMETERS:  gpe_event_info          - Remove a reference to this GPE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 *              removed, the GPE is hardware-disabled.
 *
 ******************************************************************************/

acpi_status
acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
{
 acpi_status status = AE_OK;

 ACPI_FUNCTION_TRACE(ev_remove_gpe_reference);

 if (!gpe_event_info->runtime_count) {
  return_ACPI_STATUS(AE_LIMIT);
 }

 gpe_event_info->runtime_count--;
 if (!gpe_event_info->runtime_count) {

  /* Disable on last reference */

  status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
  if (ACPI_SUCCESS(status)) {
   status =
       acpi_hw_low_set_gpe(gpe_event_info,
      ACPI_GPE_DISABLE);
  }

  if (ACPI_FAILURE(status)) {
   gpe_event_info->runtime_count++;
  }
 }

 return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_low_get_gpe_info
 *
 * PARAMETERS:  gpe_number          - Raw GPE number
 *              gpe_block           - A GPE info block
 *
 * RETURN:      A GPE event_info struct. NULL if not a valid GPE (The gpe_number
 *              is not within the specified GPE block)
 *
 * DESCRIPTION: Returns the event_info struct associated with this GPE. This is
 *              the low-level implementation of ev_get_gpe_event_info.
 *
 ******************************************************************************/

struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
           struct acpi_gpe_block_info
           *gpe_block)
{
 u32 gpe_index;

 /*
 * Validate that the gpe_number is within the specified gpe_block.
 * (Two steps)
 */
 if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
  return (NULL);
 }

 gpe_index = gpe_number - gpe_block->block_base_number;
 if (gpe_index >= gpe_block->gpe_count) {
  return (NULL);
 }

 return (&gpe_block->event_info[gpe_index]);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_get_gpe_event_info
 *
 * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
 *              gpe_number          - Raw GPE number
 *
 * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 *
 * DESCRIPTION: Returns the event_info struct associated with this GPE.
 *              Validates the gpe_block and the gpe_number
 *
 *              Should be called only when the GPE lists are semaphore locked
 *              and not subject to change.
 *
 ******************************************************************************/

struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
             u32 gpe_number)
{
 union acpi_operand_object *obj_desc;
 struct acpi_gpe_event_info *gpe_info;
 u32 i;

 ACPI_FUNCTION_ENTRY();

 /* A NULL gpe_device means use the FADT-defined GPE block(s) */

 if (!gpe_device) {

  /* Examine GPE Block 0 and 1 (These blocks are permanent) */

  for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
   gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
           acpi_gbl_gpe_fadt_blocks
           [i]);
   if (gpe_info) {
    return (gpe_info);
   }
  }

  /* The gpe_number was not in the range of either FADT GPE block */

  return (NULL);
 }

 /* A Non-NULL gpe_device means this is a GPE Block Device */

 obj_desc =
     acpi_ns_get_attached_object((struct acpi_namespace_node *)
            gpe_device);
 if (!obj_desc || !obj_desc->device.gpe_block) {
  return (NULL);
 }

 return (acpi_ev_low_get_gpe_info
  (gpe_number, obj_desc->device.gpe_block));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_gpe_detect
 *
 * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 *                                    Can have multiple GPE blocks attached.
 *
 * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 *
 * DESCRIPTION: Detect if any GP events have occurred. This function is
 *              executed at interrupt level.
 *
 ******************************************************************************/

u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list)
{
 struct acpi_gpe_block_info *gpe_block;
 struct acpi_namespace_node *gpe_device;
 struct acpi_gpe_register_info *gpe_register_info;
 struct acpi_gpe_event_info *gpe_event_info;
 u32 gpe_number;
 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 acpi_cpu_flags flags;
 u32 i;
 u32 j;

 ACPI_FUNCTION_NAME(ev_gpe_detect);

 /* Check for the case where there are no GPEs */

 if (!gpe_xrupt_list) {
  return (int_status);
 }

 /*
 * We need to obtain the GPE lock for both the data structs and registers
 * Note: Not necessary to obtain the hardware lock, since the GPE
 * registers are owned by the gpe_lock.
 */
 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

 /* Examine all GPE blocks attached to this interrupt level */

 gpe_block = gpe_xrupt_list->gpe_block_list_head;
 while (gpe_block) {
  gpe_device = gpe_block->node;

  /*
 * Read all of the 8-bit GPE status and enable registers in this GPE
 * block, saving all of them. Find all currently active GP events.
 */
  for (i = 0; i < gpe_block->register_count; i++) {

   /* Get the next status/enable pair */

   gpe_register_info = &gpe_block->register_info[i];

   /*
 * Optimization: If there are no GPEs enabled within this
 * register, we can safely ignore the entire register.
 */
   if (!(gpe_register_info->enable_for_run |
         gpe_register_info->enable_for_wake)) {
    ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
        "Ignore disabled registers for GPE %02X-%02X: "
        "RunEnable=%02X, WakeEnable=%02X\n",
        gpe_register_info->
        base_gpe_number,
        gpe_register_info->
        base_gpe_number +
        (ACPI_GPE_REGISTER_WIDTH - 1),
        gpe_register_info->
        enable_for_run,
        gpe_register_info->
        enable_for_wake));
    continue;
   }

   /* Now look at the individual GPEs in this byte register */

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

    /* Detect and dispatch one GPE bit */

    gpe_event_info =
        &gpe_block->
        event_info[((acpi_size)i *
      ACPI_GPE_REGISTER_WIDTH) + j];
    gpe_number =
        j + gpe_register_info->base_gpe_number;
    acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
    int_status |=
        acpi_ev_detect_gpe(gpe_device,
             gpe_event_info,
             gpe_number);
    flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
   }
  }

  gpe_block = gpe_block->next;
 }

 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 return (int_status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 *
 * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 *
 * RETURN:      None
 *
 * DESCRIPTION: Perform the actual execution of a GPE control method. This
 *              function is called from an invocation of acpi_os_execute and
 *              therefore does NOT execute at interrupt level - so that
 *              the control method itself is not executed in the context of
 *              an interrupt handler.
 *
 ******************************************************************************/

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
{
 struct acpi_gpe_event_info *gpe_event_info = context;
 acpi_status status = AE_OK;
 struct acpi_evaluate_info *info;
 struct acpi_gpe_notify_info *notify;

 ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);

 /* Do the correct dispatch - normal method or implicit notify */

 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
 case ACPI_GPE_DISPATCH_NOTIFY:
  /*
 * Implicit notify.
 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
 * NOTE: the request is queued for execution after this method
 * completes. The notify handlers are NOT invoked synchronously
 * from this thread -- because handlers may in turn run other
 * control methods.
 *
 * June 2012: Expand implicit notify mechanism to support
 * notifies on multiple device objects.
 */
  notify = gpe_event_info->dispatch.notify_list;
  while (ACPI_SUCCESS(status) && notify) {
   status =
       acpi_ev_queue_notify_request(notify->device_node,
        ACPI_NOTIFY_DEVICE_WAKE);

   notify = notify->next;
  }

  break;

 case ACPI_GPE_DISPATCH_METHOD:

  /* Allocate the evaluation information block */

  info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
  if (!info) {
   status = AE_NO_MEMORY;
  } else {
   /*
 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
 * _Lxx/_Exx control method that corresponds to this GPE
 */
   info->prefix_node =
       gpe_event_info->dispatch.method_node;
   info->flags = ACPI_IGNORE_RETURN_VALUE;

   status = acpi_ns_evaluate(info);
   ACPI_FREE(info);
  }

  if (ACPI_FAILURE(status)) {
   ACPI_EXCEPTION((AE_INFO, status,
     "while evaluating GPE method [%4.4s]",
     acpi_ut_get_node_name(gpe_event_info->
             dispatch.
             method_node)));
  }
  break;

 default:

  goto error_exit; /* Should never happen */
 }

 /* Defer enabling of GPE until all notify handlers are done */

 status = acpi_os_execute(OSL_NOTIFY_HANDLER,
     acpi_ev_asynch_enable_gpe, gpe_event_info);
 if (ACPI_SUCCESS(status)) {
  return_VOID;
 }

error_exit:
 acpi_ev_asynch_enable_gpe(gpe_event_info);
 return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_asynch_enable_gpe
 *
 * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 *              Callback from acpi_os_execute
 *
 * RETURN:      None
 *
 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
 *              complete (i.e., finish execution of Notify)
 *
 ******************************************************************************/

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context)
{
 struct acpi_gpe_event_info *gpe_event_info = context;
 acpi_cpu_flags flags;

 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 (void)acpi_ev_finish_gpe(gpe_event_info);
 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

 return;
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_finish_gpe
 *
 * PARAMETERS:  gpe_event_info      - Info for this GPE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
 *              of a GPE method or a synchronous or asynchronous GPE handler.
 *
 ******************************************************************************/

acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
 acpi_status status;

 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
     ACPI_GPE_LEVEL_TRIGGERED) {
  /*
 * GPE is level-triggered, we clear the GPE status bit after
 * handling the event.
 */
  status = acpi_hw_clear_gpe(gpe_event_info);
  if (ACPI_FAILURE(status)) {
   return (status);
  }
 }

 /*
 * Enable this GPE, conditionally. This means that the GPE will
 * only be physically enabled if the enable_mask bit is set
 * in the event_info.
 */
 (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE);
 gpe_event_info->disable_for_dispatch = FALSE;
 return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_detect_gpe
 *
 * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
 *              gpe_event_info      - Info for this GPE
 *              gpe_number          - Number relative to the parent GPE block
 *
 * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 *
 * DESCRIPTION: Detect and dispatch a General Purpose Event to either a function
 *              (e.g. EC) or method (e.g. _Lxx/_Exx) handler.
 * NOTE:        GPE is W1C, so it is possible to handle a single GPE from both
 *              task and irq context in parallel as long as the process to
 *              detect and mask the GPE is atomic.
 *              However the atomicity of ACPI_GPE_DISPATCH_RAW_HANDLER is
 *              dependent on the raw handler itself.
 *
 ******************************************************************************/

u32
acpi_ev_detect_gpe(struct acpi_namespace_node *gpe_device,
     struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
{
 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 u8 enabled_status_byte;
 u64 status_reg;
 u64 enable_reg;
 u32 register_bit;
 struct acpi_gpe_register_info *gpe_register_info;
 struct acpi_gpe_handler_info *gpe_handler_info;
 acpi_cpu_flags flags;
 acpi_status status;

 ACPI_FUNCTION_TRACE(ev_gpe_detect);

 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

 if (!gpe_event_info) {
  gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
  if (!gpe_event_info)
   goto error_exit;
 }

 /* Get the info block for the entire GPE register */

 gpe_register_info = gpe_event_info->register_info;

 /* Get the register bitmask for this GPE */

 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);

 /* GPE currently enabled (enable bit == 1)? */

 status = acpi_hw_gpe_read(&enable_reg, &gpe_register_info->enable_address);
 if (ACPI_FAILURE(status)) {
  goto error_exit;
 }

 /* GPE currently active (status bit == 1)? */

 status = acpi_hw_gpe_read(&status_reg, &gpe_register_info->status_address);
 if (ACPI_FAILURE(status)) {
  goto error_exit;
 }

 /* Check if there is anything active at all in this GPE */

 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
     "Read registers for GPE %02X: Status=%02X, Enable=%02X, "
     "RunEnable=%02X, WakeEnable=%02X\n",
     gpe_number,
     (u32)(status_reg & register_bit),
     (u32)(enable_reg & register_bit),
     gpe_register_info->enable_for_run,
     gpe_register_info->enable_for_wake));

 enabled_status_byte = (u8)(status_reg & enable_reg);
 if (!(enabled_status_byte & register_bit)) {
  goto error_exit;
 }

 /* Invoke global event handler if present */

 acpi_gpe_count++;
 if (acpi_gbl_global_event_handler) {
  acpi_gbl_global_event_handler(ACPI_EVENT_TYPE_GPE,
           gpe_device, gpe_number,
           acpi_gbl_global_event_handler_context);
 }

 /* Found an active GPE */

 if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
     ACPI_GPE_DISPATCH_RAW_HANDLER) {

  /* Dispatch the event to a raw handler */

  gpe_handler_info = gpe_event_info->dispatch.handler;

  /*
 * There is no protection around the namespace node
 * and the GPE handler to ensure a safe destruction
 * because:
 * 1. The namespace node is expected to always
 *    exist after loading a table.
 * 2. The GPE handler is expected to be flushed by
 *    acpi_os_wait_events_complete() before the
 *    destruction.
 */
  acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
  int_status |=
      gpe_handler_info->address(gpe_device, gpe_number,
           gpe_handler_info->context);
  flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 } else {
  /* Dispatch the event to a standard handler or method. */

  int_status |= acpi_ev_gpe_dispatch(gpe_device,
         gpe_event_info, gpe_number);
 }

error_exit:
 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 return (int_status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_gpe_dispatch
 *
 * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
 *              gpe_event_info      - Info for this GPE
 *              gpe_number          - Number relative to the parent GPE block
 *
 * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 *
 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 *              or method (e.g. _Lxx/_Exx) handler.
 *
 ******************************************************************************/

u32
acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device,
       struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
{
 acpi_status status;
 u32 return_value;

 ACPI_FUNCTION_TRACE(ev_gpe_dispatch);

 /*
 * Always disable the GPE so that it does not keep firing before
 * any asynchronous activity completes (either from the execution
 * of a GPE method or an asynchronous GPE handler.)
 *
 * If there is no handler or method to run, just disable the
 * GPE and leave it disabled permanently to prevent further such
 * pointless events from firing.
 */
 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
 if (ACPI_FAILURE(status)) {
  ACPI_EXCEPTION((AE_INFO, status,
    "Unable to disable GPE %02X", gpe_number));
  return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 }

 /*
 * If edge-triggered, clear the GPE status bit now. Note that
 * level-triggered events are cleared after the GPE is serviced.
 */
 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
     ACPI_GPE_EDGE_TRIGGERED) {
  status = acpi_hw_clear_gpe(gpe_event_info);
  if (ACPI_FAILURE(status)) {
   ACPI_EXCEPTION((AE_INFO, status,
     "Unable to clear GPE %02X",
     gpe_number));
   (void)acpi_hw_low_set_gpe(gpe_event_info,
        ACPI_GPE_CONDITIONAL_ENABLE);
   return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
  }
 }

 gpe_event_info->disable_for_dispatch = TRUE;

 /*
 * Dispatch the GPE to either an installed handler or the control
 * method associated with this GPE (_Lxx or _Exx). If a handler
 * exists, we invoke it and do not attempt to run the method.
 * If there is neither a handler nor a method, leave the GPE
 * disabled.
 */
 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
 case ACPI_GPE_DISPATCH_HANDLER:

  /* Invoke the installed handler (at interrupt level) */

  return_value =
      gpe_event_info->dispatch.handler->address(gpe_device,
             gpe_number,
             gpe_event_info->
             dispatch.handler->
             context);

  /* If requested, clear (if level-triggered) and re-enable the GPE */

  if (return_value & ACPI_REENABLE_GPE) {
   (void)acpi_ev_finish_gpe(gpe_event_info);
  }
  break;

 case ACPI_GPE_DISPATCH_METHOD:
 case ACPI_GPE_DISPATCH_NOTIFY:
  /*
 * Execute the method associated with the GPE
 * NOTE: Level-triggered GPEs are cleared after the method completes.
 */
  status = acpi_os_execute(OSL_GPE_HANDLER,
      acpi_ev_asynch_execute_gpe_method,
      gpe_event_info);
  if (ACPI_FAILURE(status)) {
   ACPI_EXCEPTION((AE_INFO, status,
     "Unable to queue handler for GPE %02X - event disabled",
     gpe_number));
  }
  break;

 default:
  /*
 * No handler or method to run!
 * 03/2010: This case should no longer be possible. We will not allow
 * a GPE to be enabled if it has no handler or method.
 */
  ACPI_ERROR((AE_INFO,
       "No handler or method for GPE %02X, disabling event",
       gpe_number));

  break;
 }

 return_UINT32(ACPI_INTERRUPT_HANDLED);
}

#endif    /* !ACPI_REDUCED_HARDWARE */