1 files changed, 76 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Library/XenHypercallLib/XenHypercall.c b/roms/edk2/OvmfPkg/Library/XenHypercallLib/XenHypercall.c
new file mode 100644
index 000000000..265aa766d
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Library/XenHypercallLib/XenHypercall.c
@@ -0,0 +1,76 @@
+/** @file
+  Functions to make Xen hypercalls.
+
+  Copyright (C) 2014, Citrix Ltd.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+
+#include <IndustryStandard/Xen/hvm/params.h>
+#include <IndustryStandard/Xen/memory.h>
+
+#include <Library/DebugLib.h>
+#include <Library/XenHypercallLib.h>
+
+RETURN_STATUS
+EFIAPI
+XenHypercallLibConstruct (
+  VOID
+  )
+{
+  XenHypercallLibInit ();
+  //
+  // We don't fail library construction, since that has catastrophic
+  // consequences for client modules (whereas those modules may easily be
+  // running on a non-Xen platform). Instead, XenHypercallIsAvailable()
+  // will return FALSE.
+  //
+  return RETURN_SUCCESS;
+}
+
+UINT64
+EFIAPI
+XenHypercallHvmGetParam (
+  IN UINT32        Index
+  )
+{
+  xen_hvm_param_t     Parameter;
+  INTN                Error;
+
+  Parameter.domid = DOMID_SELF;
+  Parameter.index = Index;
+  Error = XenHypercall2 (__HYPERVISOR_hvm_op,
+                         HVMOP_get_param, (INTN) &Parameter);
+  if (Error != 0) {
+    DEBUG ((DEBUG_ERROR,
+            "XenHypercall: Error %Ld trying to get HVM parameter %d\n",
+            (INT64)Error, Index));
+    return 0;
+  }
+  return Parameter.value;
+}
+
+INTN
+EFIAPI
+XenHypercallMemoryOp (
+  IN     UINTN Operation,
+  IN OUT VOID *Arguments
+  )
+{
+  return XenHypercall2 (__HYPERVISOR_memory_op,
+                        Operation, (INTN) Arguments);
+}
+
+INTN
+EFIAPI
+XenHypercallEventChannelOp (
+  IN     INTN Operation,
+  IN OUT VOID *Arguments
+  )
+{
+  return XenHypercall2 (__HYPERVISOR_event_channel_op,
+                        Operation, (INTN) Arguments);
+}