1 files changed, 70 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-I4D.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-I4D.asm
new file mode 100644
index 00000000..bd7711fc
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-I4D.asm
@@ -0,0 +1,70 @@
+; $Id: bs3-wc16-I4D.asm $
+;; @file
+; BS3Kit - 16-bit Watcom C/C++, 32-bit signed integer division.
+;
+
+;
+; Copyright (C) 2007-2019 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.
+;
+
+%include "bs3kit-template-header.mac"
+
+
+;;
+; 32-bit signed integer division.
+;
+; @returns  DX:AX quotient, CX:BX remainder.
+; @param    DX:AX           Dividend.
+; @param    CX:BX           Divisor
+;
+; @uses     Nothing.
+;
+global $_?I4D
+$_?I4D:
+;; @todo no idea if we're getting the negative division stuff right here according to what watcom expectes...
+extern TODO_NEGATIVE_SIGNED_DIVISION
+        ; Move dividend into EDX:EAX
+        shl     eax, 10h
+        mov     ax, dx
+        sar     dx, 0fh
+        movsx   edx, dx
+
+        ; Move divisor into ebx.
+        shl     ebx, 10h
+        mov     bx, cx
+
+        ; Do it!
+        idiv    ebx
+
+        ; Reminder in to CX:BX
+        mov     bx, dx
+        shr     edx, 10h
+        mov     cx, dx
+
+        ; Quotient into DX:AX
+        mov     edx, eax
+        shr     edx, 10h
+
+%ifdef ASM_MODEL_FAR_CODE
+        retf
+%else
+        ret
+%endif
+