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diff --git a/include/VBox/vmm/pdmins.h b/include/VBox/vmm/pdmins.h
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+/** @file
+ * PDM - Pluggable Device Manager, Common Instance Macros.
+ */
+
+/*
+ * Copyright (C) 2006-2010 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef ___VBox_vmm_pdmins_h
+#define ___VBox_vmm_pdmins_h
+
+
+/** @defgroup grp_pdm_ins       Common PDM Instance Macros
+ * @ingroup grp_pdm
+ * @{
+ */
+
+/** @def PDMBOTHCBDECL
+ * Macro for declaring a callback which is static in HC and exported in GC.
+ */
+#if defined(IN_RC) || defined(IN_RING0)
+# ifdef __cplusplus
+#  define PDMBOTHCBDECL(type)   extern "C" DECLEXPORT(type)
+# else
+#  define PDMBOTHCBDECL(type)   DECLEXPORT(type)
+# endif
+#else
+# define PDMBOTHCBDECL(type)    static type
+#endif
+
+/** @def PDMINS_2_DATA
+ * Converts a PDM Device, USB Device, or Driver instance pointer to a pointer to the instance data.
+ */
+#define PDMINS_2_DATA(pIns, type)   ( (type)(void *)&(pIns)->achInstanceData[0] )
+
+/** @def PDMINS_2_DATA_RCPTR
+ * Converts a PDM Device, USB Device, or Driver instance pointer to a RC pointer to the instance data.
+ */
+#define PDMINS_2_DATA_RCPTR(pIns)   ( (pIns)->pvInstanceDataRC )
+
+/** @def PDMINS_2_DATA_R3PTR
+ * Converts a PDM Device, USB Device, or Driver instance pointer to a HC pointer to the instance data.
+ */
+#define PDMINS_2_DATA_R3PTR(pIns)   ( (pIns)->pvInstanceDataR3 )
+
+/** @def PDMINS_2_DATA_R0PTR
+ * Converts a PDM Device, USB Device, or Driver instance pointer to a R0 pointer to the instance data.
+ */
+#define PDMINS_2_DATA_R0PTR(pIns)   ( (pIns)->pvInstanceDataR0 )
+
+/** @} */
+
+#endif