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      1 /** @file
      2   Event Channel function implementation.
      3 
      4   Event channel are use to notify of an event that happend in a shared
      5   structure for example.
      6 
      7   Copyright (C) 2014, Citrix Ltd.
      8 
      9   This program and the accompanying materials
     10   are licensed and made available under the terms and conditions of the BSD License
     11   which accompanies this distribution.  The full text of the license may be found at
     12   http://opensource.org/licenses/bsd-license.php
     13 
     14   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
     15   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
     16 
     17 **/
     18 #include "EventChannel.h"
     19 
     20 #include <Library/XenHypercallLib.h>
     21 
     22 UINT32
     23 XenEventChannelNotify (
     24   IN XENBUS_DEVICE *Dev,
     25   IN evtchn_port_t Port
     26   )
     27 {
     28   INTN ReturnCode;
     29   evtchn_send_t Send;
     30 
     31   Send.port = Port;
     32   ReturnCode = XenHypercallEventChannelOp (EVTCHNOP_send, &Send);
     33   return (UINT32)ReturnCode;
     34 }
     35 
     36 UINT32
     37 EFIAPI
     38 XenBusEventChannelAllocate (
     39   IN  XENBUS_PROTOCOL *This,
     40   IN  domid_t         DomainId,
     41   OUT evtchn_port_t   *Port
     42   )
     43 {
     44   evtchn_alloc_unbound_t Parameter;
     45   UINT32 ReturnCode;
     46 
     47   Parameter.dom = DOMID_SELF;
     48   Parameter.remote_dom = DomainId;
     49   ReturnCode = (UINT32)XenHypercallEventChannelOp (
     50                                    EVTCHNOP_alloc_unbound,
     51                                    &Parameter);
     52   if (ReturnCode != 0) {
     53     DEBUG ((EFI_D_ERROR, "ERROR: alloc_unbound failed with rc=%d", ReturnCode));
     54     return ReturnCode;
     55   }
     56   *Port = Parameter.port;
     57   return ReturnCode;
     58 }
     59 
     60 UINT32
     61 EFIAPI
     62 XenBusEventChannelNotify (
     63   IN XENBUS_PROTOCOL *This,
     64   IN evtchn_port_t   Port
     65   )
     66 {
     67   XENBUS_PRIVATE_DATA *Private;
     68 
     69   Private = XENBUS_PRIVATE_DATA_FROM_THIS(This);
     70   return XenEventChannelNotify (Private->Dev, Port);
     71 }
     72 
     73 UINT32
     74 EFIAPI
     75 XenBusEventChannelClose (
     76   IN XENBUS_PROTOCOL *This,
     77   IN evtchn_port_t   Port
     78   )
     79 {
     80   evtchn_close_t Close;
     81 
     82   Close.port = Port;
     83   return (UINT32)XenHypercallEventChannelOp (EVTCHNOP_close, &Close);
     84 }
     85