upload android base code part6

android/device/linaro/bootloader/edk2/OvmfPkg/XenBusDxe/EventChannel.h

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+/** @file
+  Event Channel function declaration.
+
+  Copyright (C) 2014, Citrix Ltd.
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+#ifndef __XENBUS_EVENT_CHANNEL_H
+#define __XENBUS_EVENT_CHANNEL_H
+
+#include "XenBusDxe.h"
+
+#include <IndustryStandard/Xen/event_channel.h>
+
+/**
+  Send an event to the remote end of the channel whose local endpoint is Port.
+
+  @param Dev    A pointer to XENBUS_DEVICE.
+  @param Port   The port to notify.
+
+  @return       Return 0 on success, or return the errno code from the hypercall.
+**/
+UINT32
+XenEventChannelNotify (
+  IN XENBUS_DEVICE *Dev,
+  IN evtchn_port_t Port
+  );
+
+/*
+ * XenBus protocol
+ */
+
+/**
+  Allocate a port that can be bind from domain DomainId.
+
+  @param This       A pointer to the XENBUS_PROTOCOL.
+  @param DomainId   The domain ID that can bind the newly allocated port.
+  @param Port       A pointer to a evtchn_port_t that will contain the newly
+                    allocated port.
+
+  @retval UINT32    The return value from the hypercall, 0 if success.
+**/
+UINT32
+EFIAPI
+XenBusEventChannelAllocate (
+  IN  XENBUS_PROTOCOL *This,
+  IN  domid_t         DomainId,
+  OUT evtchn_port_t   *Port
+  );
+
+/**
+  Send an event to the remote end of the channel whose local endpoint is Port.
+
+  @param This       A pointer to the XENBUS_PROTOCOL.
+  @param Port       Local port to the the event from.
+
+  @retval UINT32    The return value from the hypercall, 0 if success.
+**/
+UINT32
+EFIAPI
+XenBusEventChannelNotify (
+  IN XENBUS_PROTOCOL *This,
+  IN evtchn_port_t   Port
+  );
+
+/**
+  Close a local event channel Port.
+
+  @param This       A pointer to the XENBUS_PROTOCOL.
+  @param Port       The event channel to close.
+
+  @retval UINT32    The return value from the hypercall, 0 if success.
+**/
+UINT32
+EFIAPI
+XenBusEventChannelClose (
+  IN XENBUS_PROTOCOL *This,
+  IN evtchn_port_t   Port
+  );
+
+#endif