1 files changed, 63 insertions, 0 deletions
diff --git a/OvmfPkg/SmbiosPlatformDxe/Xen.c b/OvmfPkg/SmbiosPlatformDxe/Xen.c
new file mode 100644
index 0000000000..93b8f74366
--- /dev/null
+++ b/OvmfPkg/SmbiosPlatformDxe/Xen.c
@@ -0,0 +1,63 @@
+/** @file
+  Detect Xen hvmloader SMBIOS data for usage by OVMF.
+
+  Copyright (c) 2011, Bei Guan <gbtju85@gmail.com>
+  Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
+
+  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 "SmbiosPlatformDxe.h"
+#include <Library/HobLib.h>
+#include <Guid/XenInfo.h>
+
+#define XEN_SMBIOS_PHYSICAL_ADDRESS       0x000EB000
+#define XEN_SMBIOS_PHYSICAL_END           0x000F0000
+
+/**
+  Locates the Xen SMBIOS data if it exists
+
+  @return SMBIOS_TABLE_ENTRY_POINT   Address of Xen SMBIOS data
+
+**/
+SMBIOS_TABLE_ENTRY_POINT *
+GetXenSmbiosTables (
+  VOID
+  )
+{
+  UINT8                     *XenSmbiosPtr;
+  SMBIOS_TABLE_ENTRY_POINT  *XenSmbiosEntryPointStructure;
+  EFI_HOB_GUID_TYPE         *GuidHob;
+
+  //
+  // See if a XenInfo HOB is available
+  //
+  GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
+  if (GuidHob == NULL) {
+    return NULL;
+  }
+
+  for (XenSmbiosPtr = (UINT8*) XEN_SMBIOS_PHYSICAL_ADDRESS;
+       XenSmbiosPtr < (UINT8*) XEN_SMBIOS_PHYSICAL_END;
+       XenSmbiosPtr += 0x10) {
+
+    XenSmbiosEntryPointStructure = (SMBIOS_TABLE_ENTRY_POINT *) XenSmbiosPtr;
+
+    if (!AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->AnchorString, "_SM_", 4) &&
+        !AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->IntermediateAnchorString, "_DMI_", 5) &&
+        IsEntryPointStructureValid (XenSmbiosEntryPointStructure)) {
+
+      return XenSmbiosEntryPointStructure;
+
+    }
+  }
+
+  return NULL;
+}