Ovmf/Xen: refactor XenBusDxe hypercall implementation

[mirror_edk2.git] / OvmfPkg / XenBusDxe / EventChannel.c

/** @file\r
  Event Channel function implementation.\r
\r
  Event channel are use to notify of an event that happend in a shared\r
  structure for example.\r
\r
  Copyright (C) 2014, Citrix Ltd.\r
\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
#include "EventChannel.h"\r
#include "XenHypercall.h"\r
\r
UINT32\r
XenEventChannelNotify (\r
  IN XENBUS_DEVICE *Dev,\r
  IN evtchn_port_t Port\r
  )\r
{\r
  INTN ReturnCode;\r
  evtchn_send_t Send;\r
\r
  Send.port = Port;\r
  ReturnCode = XenHypercallEventChannelOp (EVTCHNOP_send, &Send);\r
  return (UINT32)ReturnCode;\r
}\r
\r
UINT32\r
EFIAPI\r
XenBusEventChannelAllocate (\r
  IN  XENBUS_PROTOCOL *This,\r
  IN  domid_t         DomainId,\r
  OUT evtchn_port_t   *Port\r
  )\r
{\r
  evtchn_alloc_unbound_t Parameter;\r
  UINT32 ReturnCode;\r
\r
  Parameter.dom = DOMID_SELF;\r
  Parameter.remote_dom = DomainId;\r
  ReturnCode = (UINT32)XenHypercallEventChannelOp (\r
                                   EVTCHNOP_alloc_unbound,\r
                                   &Parameter);\r
  if (ReturnCode != 0) {\r
    DEBUG ((EFI_D_ERROR, "ERROR: alloc_unbound failed with rc=%d", ReturnCode));\r
    return ReturnCode;\r
  }\r
  *Port = Parameter.port;\r
  return ReturnCode;\r
}\r
\r
UINT32\r
EFIAPI\r
XenBusEventChannelNotify (\r
  IN XENBUS_PROTOCOL *This,\r
  IN evtchn_port_t   Port\r
  )\r
{\r
  XENBUS_PRIVATE_DATA *Private;\r
\r
  Private = XENBUS_PRIVATE_DATA_FROM_THIS(This);\r
  return XenEventChannelNotify (Private->Dev, Port);\r
}\r
\r
UINT32\r
EFIAPI\r
XenBusEventChannelClose (\r
  IN XENBUS_PROTOCOL *This,\r
  IN evtchn_port_t   Port\r
  )\r
{\r
  evtchn_close_t Close;\r
\r
  Close.port = Port;\r
  return (UINT32)XenHypercallEventChannelOp (EVTCHNOP_close, &Close);\r
}\r