9914760949
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@690 6ac86273-5f31-0410-b378-82cca8765d1b
55 lines
1.5 KiB
NASM
55 lines
1.5 KiB
NASM
;
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; File:
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; rdpcclk.asm
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; Description:
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; read the PC style clock from bios
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;
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; Copyright (c) 1995
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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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; $Header$
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;
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%include "../kernel/segs.inc"
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segment HMA_TEXT
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;
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; BOOL ReadPCClock(Ticks)
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; ULONG *Ticks;
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;
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global _ReadPCClock
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_ReadPCClock:
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mov ah,0
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int 1ah
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extern _DaysSinceEpoch ; ; update days if necessary
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; (ah is still 0, al contains midnight flag)
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add word [_DaysSinceEpoch ],ax ; *some* BIOS's accumulate several days
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adc word [_DaysSinceEpoch+2],0 ;
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; set return value dx:ax
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xchg ax,cx ; ax=_cx, cx=_ax
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xchg ax,dx ; dx=_cx, ax=_dx (cx=_ax)
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ret
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