VirtualBox

source: vbox/trunk/src/VBox/Devices/BiosCommonCode/__I4D.asm@ 77918

Last change on this file since 77918 was 76553, checked in by vboxsync, 6 years ago

scm --update-copyright-year

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.0 KB
Line 
1; $Id: __I4D.asm 76553 2019-01-01 01:45:53Z vboxsync $
2;; @file
3; Compiler support routines.
4;
5
6;
7; Copyright (C) 2012-2019 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17
18
19;*******************************************************************************
20;* Exported Symbols *
21;*******************************************************************************
22public __I4D
23
24if VBOX_BIOS_CPU lt 80386
25extrn NeedToImplementOn8086__I4D:near
26endif
27
28 .8086
29
30
31_TEXT segment public 'CODE' use16
32 assume cs:_TEXT
33
34;;
35; 32-bit signed division.
36;
37; @param dx:ax Dividend.
38; @param cx:bx Divisor.
39; @returns dx:ax Quotient.
40; cx:bx Remainder.
41;
42__I4D:
43 pushf
44if VBOX_BIOS_CPU ge 80386
45 .386
46 push eax
47 push edx
48 push ecx
49
50 rol eax, 16
51 mov ax, dx
52 ror eax, 16
53 xor edx, edx
54
55 shr ecx, 16
56 mov cx, bx
57
58 idiv ecx ; eax:edx / ecx -> eax=quotient, edx=remainder.
59
60 mov bx, dx
61 pop ecx
62 shr edx, 16
63 mov cx, dx
64
65 pop edx
66 ror eax, 16
67 mov dx, ax
68 add sp, 2
69 pop ax
70 rol eax, 16
71 .8086
72else
73 call NeedToImplementOn8086__I4D
74endif
75 popf
76 ret
77
78
79_TEXT ends
80 end
81
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