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diff --git a/src/VBox/Runtime/common/time/timesupA.asm b/src/VBox/Runtime/common/time/timesupA.asm
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+; $Id: timesupA.asm $
+;; @file
+; IPRT - Time using SUPLib, the Assembly Implementation.
+;
+
+;
+; Copyright (C) 2006-2020 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 IN_GUEST
+
+%include "iprt/asmdefs.mac"
+%include "VBox/sup.mac"
+
+;
+; Use the C reference implementation for now.
+;
+%error "This is out of date, use C code. Not worth it for a couple of ticks in some functions and equal or worse performance in others."
+This is out of date
+This is out of date
+This is out of date
+
+
+;; Keep this in sync with iprt/time.h.
+struc RTTIMENANOTSDATA
+ .pu64Prev RTCCPTR_RES 1
+ .pfnBad RTCCPTR_RES 1
+ .pfnRediscover RTCCPTR_RES 1
+ .pvDummy RTCCPTR_RES 1
+ .c1nsSteps resd 1
+ .cExpired resd 1
+ .cBadPrev resd 1
+ .cUpdateRaces resd 1
+endstruc
+
+
+BEGINDATA
+%undef IN_SUPLIB
+%undef IMPORTED_SUPLIB
+%ifdef IN_SUP_R0
+ %define IN_SUPLIB
+%endif
+%ifdef IN_SUP_R3
+ %define IN_SUPLIB
+%endif
+%ifdef IN_SUP_RC
+ %define IN_SUPLIB
+%endif
+%ifdef IN_SUPLIB
+ extern NAME(g_pSUPGlobalInfoPage)
+%elifdef IN_RING0
+ %ifdef RT_OS_WINDOWS
+ %define IMPORTED_SUPLIB
+ extern IMPNAME(g_SUPGlobalInfoPage)
+ %else
+ extern NAME(g_SUPGlobalInfoPage)
+ %endif
+%else
+ %ifdef RT_OS_WINDOWS
+ %define IMPORTED_SUPLIB
+ extern IMPNAME(g_pSUPGlobalInfoPage)
+ %else
+ extern NAME(g_pSUPGlobalInfoPage)
+ %endif
+%endif
+
+BEGINCODE
+
+;
+; The default stuff that works everywhere.
+; Uses cpuid for serializing.
+;
+%undef ASYNC_GIP
+%undef USE_LFENCE
+%undef WITH_TSC_DELTA
+%undef NEED_APIC_ID
+%define NEED_TRANSACTION_ID
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLegacySyncNoDelta
+%include "timesupA.mac"
+
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLegacyInvariantNoDelta
+%include "timesupA.mac"
+
+%define WITH_TSC_DELTA
+%define NEED_APIC_ID
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLegacySyncWithDelta
+%include "timesupA.mac"
+
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLegacyInvariantWithDelta
+%include "timesupA.mac"
+
+%define ASYNC_GIP
+%undef WITH_TSC_DELTA
+%define NEED_APIC_ID
+%ifdef IN_RC
+ %undef NEED_TRANSACTION_ID
+%endif
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLegacyAsync
+%include "timesupA.mac"
+
+
+;
+; Alternative implementation that employs lfence instead of cpuid.
+;
+%undef ASYNC_GIP
+%define USE_LFENCE
+%undef WITH_TSC_DELTA
+%undef NEED_APIC_ID
+%define NEED_TRANSACTION_ID
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLFenceSyncNoDelta
+%include "timesupA.mac"
+
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLFenceInvariantNoDelta
+%include "timesupA.mac"
+
+%define WITH_TSC_DELTA
+%define NEED_APIC_ID
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLFenceSyncWithDelta
+%include "timesupA.mac"
+
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLFenceInvariantWithDelta
+%include "timesupA.mac"
+
+%define ASYNC_GIP
+%undef WITH_TSC_DELTA
+%define NEED_APIC_ID
+%ifdef IN_RC
+ %undef NEED_TRANSACTION_ID
+%endif
+%define rtTimeNanoTSInternalAsm RTTimeNanoTSLFenceAsync
+%include "timesupA.mac"
+
+
+%endif ; !IN_GUEST