1 files changed, 104 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Include/Library/XenHypercallLib.h b/roms/edk2/OvmfPkg/Include/Library/XenHypercallLib.h
new file mode 100644
index 000000000..c1491dd65
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Include/Library/XenHypercallLib.h
@@ -0,0 +1,104 @@
+/** @file
+  Functions declarations to make Xen hypercalls.
+
+  Copyright (C) 2014, Citrix Ltd.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __XEN_HYPERCALL_LIB_H__
+#define __XEN_HYPERCALL_LIB_H__
+
+/**
+  To call when the gEfiXenInfoGuid HOB became available after the library init
+  function has already been executed.
+
+  This allow to make hypercall in the PEIM stage.
+**/
+RETURN_STATUS
+EFIAPI
+XenHypercallLibInit (
+  VOID
+  );
+
+/**
+  Check if the Xen Hypercall library is able to make calls to the Xen
+  hypervisor.
+
+  Client code should call further functions in this library only if, and after,
+  this function returns TRUE.
+
+  @retval TRUE   Hypercalls are available.
+  @retval FALSE  Hypercalls are not available.
+**/
+BOOLEAN
+EFIAPI
+XenHypercallIsAvailable (
+  VOID
+  );
+
+/**
+  This function will put the two arguments in the right place (registers) and
+  invoke the hypercall identified by HypercallID.
+
+  @param HypercallID    The symbolic ID of the hypercall to be invoked
+  @param Arg1           First argument.
+  @param Arg2           Second argument.
+
+  @return   Return 0 if success otherwise it return an errno.
+**/
+INTN
+EFIAPI
+XenHypercall2 (
+  IN     UINTN  HypercallID,
+  IN OUT INTN   Arg1,
+  IN OUT INTN   Arg2
+  );
+
+/**
+  Return the value of the HVM parameter Index.
+
+  @param Index  The parameter to get, e.g. HVM_PARAM_STORE_EVTCHN.
+
+  @return   The value of the asked parameter or 0 in case of error.
+**/
+UINT64
+EFIAPI
+XenHypercallHvmGetParam (
+  UINT32 Index
+  );
+
+/**
+  Hypercall to do different operation on the memory.
+
+  @param Operation  The operation number, e.g. XENMEM_add_to_physmap.
+  @param Arguments  The arguments associated to the operation.
+
+  @return  Return the return value from the hypercall, 0 in case of success
+           otherwise, an error code.
+**/
+INTN
+EFIAPI
+XenHypercallMemoryOp (
+  IN     UINTN Operation,
+  IN OUT VOID *Arguments
+  );
+
+/**
+  Do an operation on the event channels.
+
+  @param Operation  The operation number, e.g. EVTCHNOP_send.
+  @param Arguments  The argument associated to the operation.
+
+  @return  Return the return value from the hypercall, 0 in case of success
+           otherwise, an error code.
+**/
+INTN
+EFIAPI
+XenHypercallEventChannelOp (
+  IN     INTN Operation,
+  IN OUT VOID *Arguments
+  );
+
+#endif