b857858f48
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@7 6ac86273-5f31-0410-b378-82cca8765d1b
196 lines
5.0 KiB
NASM
196 lines
5.0 KiB
NASM
; File:
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; asmsupt.asm
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; Description:
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; Assembly support routines for miscellaneous functions
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;
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; Copyright (c) 1995, 1998
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; Pasquale J. Villani
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; All Rights Reserved
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;
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; This file is part of DOS-C.
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;
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; DOS-C is free software; you can redistribute it and/or
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; modify it under the terms of the GNU General Public License
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; as published by the Free Software Foundation; either version
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; 2, or (at your option) any later version.
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;
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; DOS-C is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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; the GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public
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; License along with DOS-C; see the file COPYING. If not,
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; write to the Free Software Foundation, 675 Mass Ave,
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; Cambridge, MA 02139, USA.
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;
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; $Id$
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;
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; $Log$
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; Revision 1.2 2000/05/08 04:29:59 jimtabor
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; Update CVS to 2020
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;
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; Revision 1.3 1999/08/10 17:57:12 jprice
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; ror4 2011-02 patch
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;
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; Revision 1.2 1999/04/23 04:24:39 jprice
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; Memory manager changes made by ska
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;
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; Revision 1.1.1.1 1999/03/29 15:40:41 jprice
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; New version without IPL.SYS
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;
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; Revision 1.4 1999/02/08 05:55:57 jprice
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; Added Pat's 1937 kernel patches
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;
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; Revision 1.3 1999/02/01 01:48:41 jprice
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; Clean up; Now you can use hex numbers in config.sys. added config.sys screen function to change screen mode (28 or 43/50 lines)
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;
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; Revision 1.2 1999/01/22 04:13:25 jprice
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; Formating
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;
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; Revision 1.1.1.1 1999/01/20 05:51:01 jprice
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; Imported sources
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;
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; Rev 1.4 06 Dec 1998 8:46:50 patv
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; Bug fixes.
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;
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; Rev 1.3 03 Jan 1998 8:36:44 patv
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; Converted data area to SDA format
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;
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; Rev 1.2 29 May 1996 21:03:38 patv
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; bug fixes for v0.91a
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;
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; Rev 1.1 01 Sep 1995 17:54:26 patv
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; First GPL release.
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;
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; Rev 1.0 05 Jul 1995 11:38:42 patv
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; Initial revision.
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; $EndLog$
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;
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%include "segs.inc"
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segment _TEXT
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;
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; VOID bcopy(s, d, n)
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; REG BYTE *s, *d;
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; REG COUNT n;
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;
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;
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global _bcopy
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_bcopy:
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push bp ; Standard C entry
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mov bp,sp
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push si
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push di
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push ds
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push es
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; Get the repitition count, n
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mov cx,[bp+8]
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jcxz bcopy_exit
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; Set both ds and es to same segment (for near copy)
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mov ax,ds
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mov es,ax
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; Get the source pointer, ss
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mov si,[bp+4]
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; and the destination pointer, d
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mov di,[bp+6]
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?doIt:
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; Set direction to autoincrement
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cld
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; And do the built-in byte copy, but do a 16-bit transfer
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; whenever possible.
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mov al, cl
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and al,1 ; test for odd count
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jz b_even
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movsb
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b_even: shr cx,1
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rep movsw
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; Finally do a C exit to return
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fbcopy_exit:
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bcopy_exit: pop es
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pop ds
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pop di
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pop si
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pop bp
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ret
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;
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; VOID fbcopy(s, d, n)
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;
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; REG VOID FAR *s, FAR *d;
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; REG COUNT n;
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global _fbcopy
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_fbcopy:
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push bp ; Standard C entry
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mov bp,sp
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push si
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push di
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; Save ds, since we won't necessarily be within our
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; small/tiny environment
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push ds
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push es
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; Get the repititon count, n
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mov cx,[bp+12]
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jcxz fbcopy_exit
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; Get the far source pointer, s
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lds si,[bp+4]
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; Get the far destination pointer d
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les di,[bp+8]
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jmp short ?doIt
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;
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; VOID fmemset(s, ch, n)
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;
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; REG VOID FAR *s
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; REG int ch
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; REG COUNT n;
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global _fmemset
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_fmemset:
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push bp ; Standard C entry
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mov bp,sp
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push di
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; Save ds, since we won't necessarily be within our
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; small/tiny environment
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push es
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; Get the repititon count, n
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mov cx,[bp+10]
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jcxz fmemset_exit
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; Get the far source pointer, s
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les di,[bp+4]
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; Test if odd or even
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mov al, cl
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and al, 1
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; Get the far destination pointer ch
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mov al,[bp+8]
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mov ah, al
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jz m_even
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stosb
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m_even: shr cx,1
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rep stosw
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fmemset_exit: pop es
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pop di
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pop bp
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ret
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