diff options
Diffstat (limited to 'src/VBox/Devices/BiosCommonCode/fmemset.asm')
| -rw-r--r-- | src/VBox/Devices/BiosCommonCode/fmemset.asm | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/VBox/Devices/BiosCommonCode/fmemset.asm b/src/VBox/Devices/BiosCommonCode/fmemset.asm new file mode 100644 index 00000000..7bc1f8b4 --- /dev/null +++ b/src/VBox/Devices/BiosCommonCode/fmemset.asm @@ -0,0 +1,65 @@ +; $Id: fmemset.asm $ +;; @file +; Compiler support routines. +; + +; +; Copyright (C) 2012-2022 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>. +; +; SPDX-License-Identifier: GPL-3.0-only +; + + +;******************************************************************************* +;* Exported Symbols * +;******************************************************************************* +public _fmemset_ + + + .8086 + +_TEXT segment public 'CODE' use16 + assume cs:_TEXT + + +;; +; memset taking a far pointer. +; +; cx, es may be modified; di is preserved +; +; @returns dx:ax unchanged. +; @param dx:ax Pointer to the memory. +; @param bl The fill value. +; @param cx The number of bytes to fill. +; +_fmemset_: + push di + + mov es, dx + mov di, ax + xchg al, bl + rep stosb + xchg al, bl + + pop di + ret + +_TEXT ends + end + |