93 lines
2.1 KiB
NASM
93 lines
2.1 KiB
NASM
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; File:
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; intr.asm
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; Description:
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; Assembly implementation of calling an interrupt
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;
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; Copyright (c) 2000
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; Steffen Kaiser
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; All Rights Reserved
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;
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; This file is part of FreeDOS.
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;
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; FreeDOS 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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%include "segs.inc"
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segment _TEXT
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;
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; void intr(nr, rp)
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; REG int nr
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; REG struct REGPACK *rp
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;
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;
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global _intr
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_intr:
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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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mov ax, [bp+4] ; interrupt number
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mov [CS:intr?1-1], al
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jmp short intr?2 ; flush the instruction cache
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intr?2 mov bx, [bp+6] ; regpack structure
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mov ax, [bx]
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mov cx, [bx+4]
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mov dx, [bx+6]
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mov bp, [bx+8]
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mov di, [bx+10]
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mov si, [bx+12]
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push Word [bx+14] ; ds
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mov es, [bx+16]
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mov bx, [bx+2]
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pop ds
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int 0
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intr?1:
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pushf
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push ds
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push bx
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mov bx, sp
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mov ds, [SS:bx+8]
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mov bx, [ss:bx+20] ; address of REGPACK
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mov [bx], ax
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pop ax
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mov [bx+2], ax
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mov [bx+4], cx
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mov [bx+6], dx
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mov [bx+8], bp
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mov [bx+10], di
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mov [bx+12], si
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pop ax
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mov [bx+14], ax
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mov [bx+16], es
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pop ax
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mov [bx+18], ax
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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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