1 files changed, 118 insertions, 0 deletions
diff --git a/OvmfPkg/XenBusDxe/XenHypercall.c b/OvmfPkg/XenBusDxe/XenHypercall.c
new file mode 100644
index 0000000000..0f2ba5d693
--- /dev/null
+++ b/OvmfPkg/XenBusDxe/XenHypercall.c
@@ -0,0 +1,118 @@
+/** @file
+  Functions to make Xen hypercalls.
+
+  Copyright (C) 2014, Citrix Ltd.
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <PiDxe.h>
+#include <Library/HobLib.h>
+#include <Guid/XenInfo.h>
+
+#include "XenBusDxe.h"
+#include "XenHypercall.h"
+
+#include <IndustryStandard/Xen/hvm/params.h>
+#include <IndustryStandard/Xen/memory.h>
+
+EFI_STATUS
+XenHyperpageInit (
+  IN OUT XENBUS_DEVICE *Dev
+  )
+{
+  EFI_HOB_GUID_TYPE   *GuidHob;
+  EFI_XEN_INFO        *XenInfo;
+
+  GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
+  if (GuidHob == NULL) {
+    return EFI_NOT_FOUND;
+  }
+  XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
+  Dev->Hyperpage = XenInfo->HyperPages;
+  return EFI_SUCCESS;
+}
+
+UINT64
+XenHypercallHvmGetParam (
+  IN XENBUS_DEVICE *Dev,
+  IN INTN          Index
+  )
+{
+  xen_hvm_param_t     Parameter;
+  INTN                Error;
+
+  ASSERT (Dev->Hyperpage != NULL);
+
+  Parameter.domid = DOMID_SELF;
+  Parameter.index = Index;
+  Error = XenHypercall2 (Dev->Hyperpage + __HYPERVISOR_hvm_op * 32,
+                         HVMOP_get_param, (INTN) &Parameter);
+  if (Error != 0) {
+    DEBUG ((EFI_D_ERROR,
+            "XenHypercall: Error %d trying to get HVM parameter %d\n",
+            Error, Index));
+    return 0;
+  }
+  return Parameter.value;
+}
+
+INTN
+XenHypercallMemoryOp (
+  IN     XENBUS_DEVICE *Dev,
+  IN     UINTN Operation,
+  IN OUT VOID *Arguments
+  )
+{
+  ASSERT (Dev->Hyperpage != NULL);
+  return XenHypercall2 (Dev->Hyperpage + __HYPERVISOR_memory_op * 32,
+                        Operation, (INTN) Arguments);
+}
+
+INTN
+XenHypercallEventChannelOp (
+  IN     XENBUS_DEVICE *Dev,
+  IN     INTN Operation,
+  IN OUT VOID *Arguments
+  )
+{
+  ASSERT (Dev->Hyperpage != NULL);
+  return XenHypercall2 (Dev->Hyperpage + __HYPERVISOR_event_channel_op * 32,
+                        Operation, (INTN) Arguments);
+}
+
+EFI_STATUS
+XenGetSharedInfoPage (
+  IN OUT XENBUS_DEVICE *Dev
+  )
+{
+  xen_add_to_physmap_t Parameter;
+
+  ASSERT (Dev->SharedInfo == NULL);
+
+  Parameter.domid = DOMID_SELF;
+  Parameter.space = XENMAPSPACE_shared_info;
+  Parameter.idx = 0;
+
+  //
+  // using reserved page because the page is not released when Linux is
+  // starting because of the add_to_physmap. QEMU might try to access the
+  // page, and fail because it have no right to do so (segv).
+  //
+  Dev->SharedInfo = AllocateReservedPages (1);
+  Parameter.gpfn = (UINTN) Dev->SharedInfo >> EFI_PAGE_SHIFT;
+  if (XenHypercallMemoryOp (Dev, XENMEM_add_to_physmap, &Parameter) != 0) {
+    FreePages (Dev->SharedInfo, 1);
+    Dev->SharedInfo = NULL;
+    return EFI_LOAD_ERROR;
+  }
+
+  return EFI_SUCCESS;
+}