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 EFIAPI
  26 XenHypercallHvmGetParam (
  27   IN UINT32        Index
  28   )
  29 {
  30   xen_hvm_param_t     Parameter;
  31   INTN                Error;
  32
  33   Parameter.domid = DOMID_SELF;
  34   Parameter.index = Index;
  35   Error = XenHypercall2 (__HYPERVISOR_hvm_op,
  36                          HVMOP_get_param, (INTN) &Parameter);
  37   if (Error != 0) {
  38     DEBUG ((EFI_D_ERROR,
  39             "XenHypercall: Error %Ld trying to get HVM parameter %d\n",
  40             (INT64)Error, Index));
  41     return 0;
  42   }
  43   return Parameter.value;
  44 }
  45
  46 INTN
  47 EFIAPI
  48 XenHypercallMemoryOp (
  49   IN     UINTN Operation,
  50   IN OUT VOID *Arguments
  51   )
  52 {
  53   return XenHypercall2 (__HYPERVISOR_memory_op,
  54                         Operation, (INTN) Arguments);
  55 }
  56
  57 INTN
  58 EFIAPI
  59 XenHypercallEventChannelOp (
  60   IN     INTN Operation,
  61   IN OUT VOID *Arguments
  62   )
  63 {
  64   return XenHypercall2 (__HYPERVISOR_event_channel_op,
  65                         Operation, (INTN) Arguments);
  66 }