OvmfPkg/XenBusDxe/EventChannel.c

   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 #include "XenHypercall.h"
  20
  21 UINT32
  22 XenEventChannelNotify (
  23   IN XENBUS_DEVICE *Dev,
  24   IN evtchn_port_t Port
  25   )
  26 {
  27   INTN ReturnCode;
  28   evtchn_send_t Send;
  29
  30   Send.port = Port;
  31   ReturnCode = XenHypercallEventChannelOp (Dev, EVTCHNOP_send, &Send);
  32   return ReturnCode;
  33 }
  34
  35 UINT32
  36 EFIAPI
  37 XenBusEventChannelAllocate (
  38   IN  XENBUS_PROTOCOL *This,
  39   IN  domid_t         DomainId,
  40   OUT evtchn_port_t   *Port
  41   )
  42 {
  43   XENBUS_PRIVATE_DATA *Private;
  44   evtchn_alloc_unbound_t Parameter;
  45   UINT32 ReturnCode;
  46
  47   Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
  48
  49   Parameter.dom = DOMID_SELF;
  50   Parameter.remote_dom = DomainId;
  51   ReturnCode = XenHypercallEventChannelOp (Private->Dev,
  52                                    EVTCHNOP_alloc_unbound,
  53                                    &Parameter);
  54   if (ReturnCode != 0) {
  55     DEBUG ((EFI_D_ERROR, "ERROR: alloc_unbound failed with rc=%d", ReturnCode));
  56     return ReturnCode;
  57   }
  58   *Port = Parameter.port;
  59   return ReturnCode;
  60 }
  61
  62 UINT32
  63 EFIAPI
  64 XenBusEventChannelNotify (
  65   IN XENBUS_PROTOCOL *This,
  66   IN evtchn_port_t   Port
  67   )
  68 {
  69   XENBUS_PRIVATE_DATA *Private;
  70
  71   Private = XENBUS_PRIVATE_DATA_FROM_THIS(This);
  72   return XenEventChannelNotify (Private->Dev, Port);
  73 }
  74
  75 UINT32
  76 EFIAPI
  77 XenBusEventChannelClose (
  78   IN XENBUS_PROTOCOL *This,
  79   IN evtchn_port_t   Port
  80   )
  81 {
  82   XENBUS_PRIVATE_DATA *Private;
  83   evtchn_close_t Close;
  84
  85   Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
  86   Close.port = Port;
  87   return XenHypercallEventChannelOp (Private->Dev, EVTCHNOP_close, &Close);
  88 }