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diff --git a/include/iprt/param.h b/include/iprt/param.h
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+/** @file
+ * IPRT - Parameter Definitions.
+ */
+
+/*
+ * Copyright (C) 2006-2019 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 IPRT_INCLUDED_param_h
+#define IPRT_INCLUDED_param_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+/** @todo Much of the PAGE_* stuff here is obsolete and highly risky to have around.
+ * As for component configs (MM_*), either we gather all in here or we move those bits away! */
+
+/** @defgroup   grp_rt_param    System Parameter Definitions
+ * @ingroup grp_rt_cdefs
+ * @{
+ */
+
+/* Undefine PAGE_SIZE and PAGE_SHIFT to avoid unnecessary noice when clashing
+ * with system headers. Include system headers before / after iprt depending
+ * on which you wish to take precedence. */
+#undef PAGE_SIZE
+#undef PAGE_SHIFT
+
+/* Undefine PAGE_OFFSET_MASK to avoid the conflict with the-linux-kernel.h */
+#undef PAGE_OFFSET_MASK
+
+/**
+ * i386 Page size.
+ */
+#if defined(RT_ARCH_SPARC64)
+# define PAGE_SIZE          8192
+#else
+# define PAGE_SIZE          4096
+#endif
+
+/**
+ * i386 Page shift.
+ * This is used to convert between size (in bytes) and page count.
+ */
+#if defined(RT_ARCH_SPARC64)
+# define PAGE_SHIFT         13
+#else
+# define PAGE_SHIFT         12
+#endif
+
+/**
+ * i386 Page offset mask.
+ *
+ * Do NOT one-complement this for whatever purpose. You may get a 32-bit const when you want a 64-bit one.
+ * Use PAGE_BASE_MASK, PAGE_BASE_GC_MASK, PAGE_BASE_HC_MASK, PAGE_ADDRESS() or X86_PTE_PAE_PG_MASK.
+ */
+#if defined(RT_ARCH_SPARC64)
+# define PAGE_OFFSET_MASK    0x1fff
+#else
+# define PAGE_OFFSET_MASK    0xfff
+#endif
+
+/**
+ * Page address mask for the guest context POINTERS.
+ * @remark  Physical addresses are always masked using X86_PTE_PAE_PG_MASK!
+ */
+#define PAGE_BASE_GC_MASK   (~(RTGCUINTPTR)PAGE_OFFSET_MASK)
+
+/**
+ * Page address mask for the host context POINTERS.
+ * @remark  Physical addresses are always masked using X86_PTE_PAE_PG_MASK!
+ */
+#define PAGE_BASE_HC_MASK   (~(RTHCUINTPTR)PAGE_OFFSET_MASK)
+
+/**
+ * Page address mask for the both context POINTERS.
+ *
+ * Be careful when using this since it may be a size too big!
+ * @remark  Physical addresses are always masked using X86_PTE_PAE_PG_MASK!
+ */
+#define PAGE_BASE_MASK      (~(RTUINTPTR)PAGE_OFFSET_MASK)
+
+/**
+ * Get the page aligned address of a POINTER in the CURRENT context.
+ *
+ * @returns Page aligned address (it's an uintptr_t).
+ * @param   pv      The virtual address to align.
+ *
+ * @remarks Physical addresses are always masked using X86_PTE_PAE_PG_MASK!
+ * @remarks This only works with POINTERS in the current context.
+ *          Do NOT use on guest address or physical address!
+ */
+#define PAGE_ADDRESS(pv)    ((uintptr_t)(pv) & ~(uintptr_t)PAGE_OFFSET_MASK)
+
+/**
+ * Get the page aligned address of a physical address
+ *
+ * @returns Page aligned address (it's an RTHCPHYS or RTGCPHYS).
+ * @param   Phys    The physical address to align.
+ */
+#define PHYS_PAGE_ADDRESS(Phys) ((Phys) & X86_PTE_PAE_PG_MASK)
+
+/**
+ * Host max path (the reasonable value).
+ * @remarks defined both by iprt/param.h and iprt/path.h.
+ */
+#if !defined(IPRT_INCLUDED_path_h) || defined(DOXYGEN_RUNNING)
+# define RTPATH_MAX         (4096 + 4)    /* (PATH_MAX + 1) on linux w/ some alignment */
+#endif
+
+/** @} */
+
+
+/** @} */
+
+#endif /* !IPRT_INCLUDED_param_h */
+