diff options
Diffstat (limited to 'src/VBox/Devices/BiosCommonCode/fmemcpy.asm')
| -rw-r--r-- | src/VBox/Devices/BiosCommonCode/fmemcpy.asm | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/VBox/Devices/BiosCommonCode/fmemcpy.asm b/src/VBox/Devices/BiosCommonCode/fmemcpy.asm new file mode 100644 index 00000000..b693ac8f --- /dev/null +++ b/src/VBox/Devices/BiosCommonCode/fmemcpy.asm @@ -0,0 +1,65 @@ +; $Id: fmemcpy.asm $ +;; @file +; Compiler support routines. +; + +; +; Copyright (C) 2012-2019 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. +; + + +;******************************************************************************* +;* Exported Symbols * +;******************************************************************************* +public _fmemcpy_ + + + .8086 + +_TEXT segment public 'CODE' use16 + assume cs:_TEXT + + +;; +; memcpy taking far pointers. +; +; cx, es may be modified; si, di are preserved +; +; @returns dx:ax unchanged. +; @param dx:ax Pointer to the destination memory. +; @param cx:bx Pointer to the source memory. +; @param sp+2 The number of bytes to copy (dw). +; +_fmemcpy_: + push bp + mov bp, sp + push di + push ds + push si + + mov es, dx + mov di, ax + mov ds, cx + mov si, bx + mov cx, [bp + 4] + rep movsb + + pop si + pop ds + pop di + mov sp, bp + pop bp + ret + + +_TEXT ends + end + |