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Last change
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| 1 | ; $Id: fmemset.asm 93115 2022-01-01 11:31:46Z vboxsync $
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| 2 | ;; @file
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| 3 | ; Compiler support routines.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2012-2022 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 |
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| 18 |
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| 19 | ;*******************************************************************************
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| 20 | ;* Exported Symbols *
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| 21 | ;*******************************************************************************
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| 22 | public _fmemset_
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| 23 |
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| 24 |
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| 25 | .8086
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| 26 |
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| 27 | _TEXT segment public 'CODE' use16
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| 28 | assume cs:_TEXT
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| 29 |
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| 30 |
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| 31 | ;;
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| 32 | ; memset taking a far pointer.
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| 33 | ;
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| 34 | ; cx, es may be modified; di is preserved
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| 35 | ;
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| 36 | ; @returns dx:ax unchanged.
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| 37 | ; @param dx:ax Pointer to the memory.
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| 38 | ; @param bl The fill value.
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| 39 | ; @param cx The number of bytes to fill.
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| 40 | ;
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| 41 | _fmemset_:
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| 42 | push di
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| 43 |
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| 44 | mov es, dx
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| 45 | mov di, ax
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| 46 | xchg al, bl
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| 47 | rep stosb
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| 48 | xchg al, bl
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| 49 |
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| 50 | pop di
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| 51 | ret
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| 52 |
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| 53 | _TEXT ends
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| 54 | end
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| 55 |
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