;
; File:
;
; Description:
;
;
;			Copyright (c) 1995
;			Pasquale J. Villani
;			All Rights Reserved
;
; This file is part of DOS-C.
;
; DOS-C 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; either version
; 2, or (at your option) any later version.
;
; DOS-C 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 DOS-C; see the file COPYING.  If not,
; write to the Free Software Foundation, 675 Mass Ave,
; Cambridge, MA 02139, USA.
;
; $Logfile:   C:/dos-c/src/drivers/spl.asv  $
;
; $Header:   C:/dos-c/src/drivers/spl.asv   1.1   01 Sep 1995 18:50:42   patv  $
;
; $Log:   C:/dos-c/src/drivers/spl.asv  $
;
;   Rev 1.1   01 Sep 1995 18:50:42   patv
;Initial GPL release.
;
;   Rev 1.0   02 Jul 1995  8:00:50   patv
;Initial revision.
;

		page	60,132
		title	??????

IFDEF ??version
_TEXT		segment	byte public 'CODE'
DGROUP		group	_DATA,_BSS,_BSSEND		; small model
		assume	cs:_TEXT,ds:DGROUP,ss:DGROUP
_TEXT		ends

_DATA		segment word public 'DATA'
_DATA		ends

_BSS		segment word public 'BSS'
_BSS		ends

_BSSEND		segment byte public 'STACK'
_BSSEND		ends

ELSE
_TEXT		segment	byte public 'CODE'
_TEXT		ends

_DATA		segment word public 'DATA'
_DATA		ends

CONST		segment word public 'CONST'
CONST		ends

_BSS		segment word public 'BSS'
_BSS		ends

_BSSEND		segment byte public 'STACK'
_BSSEND		ends

DGROUP		group	CONST,_DATA,_BSS,_BSSEND	; small/tiny model
		assume	ds:DGROUP, ss:DGROUP
ENDIF


_TEXT		segment
		assume	CS: _TEXT
;
; unix-like spl - disable interrupt for set bit
;	returns old value for splx
;
_spl		proc	near
		public	_spl

		push	bp
		mov	bp,sp
		in	al,21h			; port 21h, 8259-1 int IMR
		xchg	ax,[bp+4]
		not	al
		and	al,[bp+4]
		out	21h,al			; port 21h, 8259-1 int comands
		xchg	ax,[bp+4]
		not	al
		xor	ah,ah			; Zero register
		pop	bp
		ret

_spl		endp
  
  
;
; unix-like splx - set interrupt back to what it was for spl
;	returns old value for splx
;
_splx		proc	near
		public	_splx

		push	bp
		mov	bp,sp
		mov	al,[bp+4]
		not	al
		out	21h,al			; port 21h, 8259-1 int comands
		pop	bp
		ret

_splx		endp

_TEXT		ends

		end