|
Last change
on this file since 91942 was 86686, checked in by vboxsync, 4 years ago |
|
BIOS: Only use the .8086 directive when assembling using WASM; MASM no longer understands it and errors out.
|
-
Property svn:eol-style
set to
native
-
Property svn:keywords
set to
Author Date Id Revision
|
|
File size:
2.2 KB
|
| Line | |
|---|
| 1 | ; $Id: __I4D.asm 86686 2020-10-23 13:13:34Z vboxsync $
|
|---|
| 2 | ;; @file
|
|---|
| 3 | ; Compiler support routines.
|
|---|
| 4 | ;
|
|---|
| 5 |
|
|---|
| 6 | ;
|
|---|
| 7 | ; Copyright (C) 2012-2020 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 | ;*******************************************************************************
|
|---|
| 22 | public __I4D
|
|---|
| 23 |
|
|---|
| 24 | if VBOX_BIOS_CPU lt 80386
|
|---|
| 25 | extrn NeedToImplementOn8086__I4D:near
|
|---|
| 26 | endif
|
|---|
| 27 |
|
|---|
| 28 | ; MASM (ML.EXE) is used for PXE and no longer understands the .8086 directive.
|
|---|
| 29 | ; WASM is used for the BIOS and understands it just fine.
|
|---|
| 30 | ifdef __WASM__
|
|---|
| 31 | .8086
|
|---|
| 32 | endif
|
|---|
| 33 |
|
|---|
| 34 |
|
|---|
| 35 | _TEXT segment public 'CODE' use16
|
|---|
| 36 | assume cs:_TEXT
|
|---|
| 37 |
|
|---|
| 38 | ;;
|
|---|
| 39 | ; 32-bit signed division.
|
|---|
| 40 | ;
|
|---|
| 41 | ; @param dx:ax Dividend.
|
|---|
| 42 | ; @param cx:bx Divisor.
|
|---|
| 43 | ; @returns dx:ax Quotient.
|
|---|
| 44 | ; cx:bx Remainder.
|
|---|
| 45 | ;
|
|---|
| 46 | __I4D:
|
|---|
| 47 | pushf
|
|---|
| 48 | if VBOX_BIOS_CPU ge 80386
|
|---|
| 49 | .386
|
|---|
| 50 | push eax
|
|---|
| 51 | push edx
|
|---|
| 52 | push ecx
|
|---|
| 53 |
|
|---|
| 54 | rol eax, 16
|
|---|
| 55 | mov ax, dx
|
|---|
| 56 | ror eax, 16
|
|---|
| 57 | xor edx, edx
|
|---|
| 58 |
|
|---|
| 59 | shr ecx, 16
|
|---|
| 60 | mov cx, bx
|
|---|
| 61 |
|
|---|
| 62 | idiv ecx ; eax:edx / ecx -> eax=quotient, edx=remainder.
|
|---|
| 63 |
|
|---|
| 64 | mov bx, dx
|
|---|
| 65 | pop ecx
|
|---|
| 66 | shr edx, 16
|
|---|
| 67 | mov cx, dx
|
|---|
| 68 |
|
|---|
| 69 | pop edx
|
|---|
| 70 | ror eax, 16
|
|---|
| 71 | mov dx, ax
|
|---|
| 72 | add sp, 2
|
|---|
| 73 | pop ax
|
|---|
| 74 | rol eax, 16
|
|---|
| 75 | ifdef __WASM__
|
|---|
| 76 | .8086
|
|---|
| 77 | endif
|
|---|
| 78 |
|
|---|
| 79 | else
|
|---|
| 80 | call NeedToImplementOn8086__I4D
|
|---|
| 81 | endif
|
|---|
| 82 | popf
|
|---|
| 83 | ret
|
|---|
| 84 |
|
|---|
| 85 |
|
|---|
| 86 | _TEXT ends
|
|---|
| 87 | end
|
|---|
| 88 |
|
|---|
Note:
See
TracBrowser
for help on using the repository browser.
