1 files changed, 90 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Library/XenHypercallLib/X86XenHypercall.c b/roms/edk2/OvmfPkg/Library/XenHypercallLib/X86XenHypercall.c
new file mode 100644
index 000000000..f779e4647
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Library/XenHypercallLib/X86XenHypercall.c
@@ -0,0 +1,90 @@
+/** @file
+  Xen Hypercall Library implementation for Intel architecture
+
+Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+#include <Library/HobLib.h>
+#include <Library/DebugLib.h>
+#include <Guid/XenInfo.h>
+
+STATIC VOID    *HyperPage;
+
+/**
+  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
+  )
+{
+  return HyperPage != NULL;
+}
+
+//
+// Interface exposed by the ASM implementation of the core hypercall
+//
+INTN
+EFIAPI
+__XenHypercall2 (
+  IN     VOID *HypercallAddr,
+  IN OUT INTN Arg1,
+  IN OUT INTN Arg2
+  );
+
+/**
+  Library constructor: retrieves the Hyperpage address
+  from the gEfiXenInfoGuid HOB
+**/
+
+RETURN_STATUS
+EFIAPI
+XenHypercallLibInit (
+  VOID
+  )
+{
+  EFI_HOB_GUID_TYPE   *GuidHob;
+  EFI_XEN_INFO        *XenInfo;
+
+  GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
+  if (GuidHob == NULL) {
+    return RETURN_NOT_FOUND;
+  }
+  XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
+  HyperPage = XenInfo->HyperPages;
+  return RETURN_SUCCESS;
+}
+
+/**
+  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
+  )
+{
+  ASSERT (HyperPage != NULL);
+
+  return __XenHypercall2 ((UINT8*)HyperPage + HypercallID * 32, Arg1, Arg2);
+}