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diff --git a/src/VBox/Runtime/common/math/RTUInt128MulByU64.asm b/src/VBox/Runtime/common/math/RTUInt128MulByU64.asm
new file mode 100644
index 00000000..5055330d
--- /dev/null
+++ b/src/VBox/Runtime/common/math/RTUInt128MulByU64.asm
@@ -0,0 +1,81 @@
+; $Id: RTUInt128MulByU64.asm $
+;; @file
+; IPRT - RTUInt128MulByU64 - AMD64 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.
+;
+
+
+%define RT_ASM_WITH_SEH64
+%include "iprt/asmdefs.mac"
+%include "internal/bignum.mac"
+
+
+BEGINCODE
+
+;;
+; Multiplies a 128-bit number with a 64-bit one.
+;
+; @returns puResult.
+; @param    puResult       x86:[ebp +  8]  gcc:rdi  msc:rcx
+; @param    puValue1       x86:[ebp + 12]  gcc:rsi  msc:rdx
+; @param    uValue2        x86:[ebp + 16]  gcc:rdx  msc:r8
+;
+BEGINPROC_EXPORTED RTUInt128MulByU64
+;        SEH64_SET_FRAME_xSP 0
+SEH64_END_PROLOGUE
+
+%ifdef RT_ARCH_AMD64
+ %ifdef ASM_CALL64_GCC
+  %define puResult      rdi
+  %define puValue1      rsi
+  %define uValue2       r8
+        mov     r8, rdx
+ %else
+  %define puResult      rcx
+  %define puValue1      r9
+  %define uValue2       r8
+        mov     r9, rdx
+ %endif
+
+        ; puValue1->s.Lo * uValue2
+        mov     rax, [puValue1]
+        mul     uValue2
+        mov     [puResult], rax
+        mov     r11, rdx                ; Store the lower half of the result.
+
+        ; puValue1->s.Hi * uValue2
+        mov     rax, [puValue1 + 8]
+        mul     uValue2
+        add     r11, rax                ; Calc the second half of the result.
+        mov     [puResult + 8], r11     ; Store the high half of the result.
+
+        mov     rax, puResult
+
+;%elifdef RT_ARCH_X86
+%else
+ %error "unsupported arch"
+%endif
+
+        ret
+ENDPROC RTUInt128MulByU64
+