OvmfPkg/Library/XenHypercallLib/XenHypercall.c

   1 /** @file
   2   Functions to make Xen hypercalls.
   3
   4   Copyright (C) 2014, Citrix Ltd.
   5
   6   This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <PiDxe.h>
  17
  18 #include <IndustryStandard/Xen/hvm/params.h>
  19 #include <IndustryStandard/Xen/memory.h>
  20
  21 #include <Library/DebugLib.h>
  22 #include <Library/XenHypercallLib.h>
  23
  24 UINT64
  25 XenHypercallHvmGetParam (
  26   IN UINT32        Index
  27   )
  28 {
  29   xen_hvm_param_t     Parameter;
  30   INTN                Error;
  31
  32   Parameter.domid = DOMID_SELF;
  33   Parameter.index = Index;
  34   Error = XenHypercall2 (__HYPERVISOR_hvm_op,
  35                          HVMOP_get_param, (INTN) &Parameter);
  36   if (Error != 0) {
  37     DEBUG ((EFI_D_ERROR,
  38             "XenHypercall: Error %Ld trying to get HVM parameter %d\n",
  39             (INT64)Error, Index));
  40     return 0;
  41   }
  42   return Parameter.value;
  43 }
  44
  45 INTN
  46 XenHypercallMemoryOp (
  47   IN     UINTN Operation,
  48   IN OUT VOID *Arguments
  49   )
  50 {
  51   return XenHypercall2 (__HYPERVISOR_memory_op,
  52                         Operation, (INTN) Arguments);
  53 }
  54
  55 INTN
  56 XenHypercallEventChannelOp (
  57   IN     INTN Operation,
  58   IN OUT VOID *Arguments
  59   )
  60 {
  61   return XenHypercall2 (__HYPERVISOR_event_channel_op,
  62                         Operation, (INTN) Arguments);
  63 }