1 files changed, 124 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-U4D.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-U4D.asm
new file mode 100644
index 00000000..989ff869
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-U4D.asm
@@ -0,0 +1,124 @@
+; $Id: bs3-wc16-U4D.asm $
+;; @file
+; BS3Kit - 16-bit Watcom C/C++, 32-bit unsigned integer division.
+;
+
+;
+; Copyright (C) 2007-2023 Oracle and/or its affiliates.
+;
+; This file is part of VirtualBox base platform packages, as
+; available from https://www.virtualbox.org.
+;
+; This program is free software; you can redistribute it and/or
+; modify it under the terms of the GNU General Public License
+; as published by the Free Software Foundation, in version 3 of the
+; License.
+;
+; This program is distributed in the hope that it will be useful, but
+; WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+; General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with this program; if not, see <https://www.gnu.org/licenses>.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+; in the VirtualBox 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.
+;
+; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+;
+
+%include "bs3kit-template-header.mac"
+
+
+
+;;
+; 32-bit unsigned integer division.
+;
+; @returns  DX:AX quotient, CX:BX remainder.
+; @param    DX:AX           Dividend.
+; @param    CX:BX           Divisor
+;
+; @uses     Nothing.
+;
+%ifdef BS3KIT_WITH_REAL_WATCOM_INTRINSIC_NAMES
+global __U4D
+__U4D:
+%endif
+global $_?U4D
+$_?U4D:
+%if TMPL_BITS >= 32
+        ; Move dividend into EDX:EAX
+        shl     eax, 10h
+        mov     ax, dx
+        xor     edx, edx
+
+        ; Move divisor into ebx.
+        shl     ebx, 10h
+        mov     bx, cx
+
+        ; Do it!
+        div     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
+%else
+        push    ds
+        push    es
+
+        ;
+        ; Convert to a C __cdecl call - too lazy to do this in assembly.
+        ;
+
+        ; Set up a frame of sorts, allocating 8 bytes for the result buffer.
+        push    bp
+        sub     sp, 08h
+        mov     bp, sp
+
+        ; Pointer to the return buffer.
+        push    ss
+        push    bp
+        add     bp, 08h                 ; Correct bp.
+
+        ; The divisor.
+        push    cx
+        push    bx
+
+        ; The dividend.
+        push    dx
+        push    ax
+
+        BS3_EXTERN_CMN Bs3UInt32Div
+        call    Bs3UInt32Div
+
+        ; Load the reminder.
+        mov     cx, [bp - 08h + 6]
+        mov     bx, [bp - 08h + 4]
+        ; Load the quotient.
+        mov     dx, [bp - 08h + 2]
+        mov     ax, [bp - 08h]
+
+        mov     sp, bp
+        pop     bp
+        pop     es
+        pop     ds
+
+%endif
+%ifdef ASM_MODEL_FAR_CODE
+        retf
+%else
+        ret
+%endif
+