UefiCpuPkg: Move AsmRelocateApLoopStart from Mpfuncs.nasm to AmdSev.nasm

[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 happened in a shared\r
  structure for example.\r
\r
  Copyright (C) 2014, Citrix Ltd.\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
#include "EventChannel.h"\r
\r
#include <Library/XenHypercallLib.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
                                   );\r
  if (ReturnCode != 0) {\r
    DEBUG ((DEBUG_ERROR, "ERROR: alloc_unbound failed with rc=%d", ReturnCode));\r
    return ReturnCode;\r
  }\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