src/video/ataricommon/SDL_ikbdinterrupt.S
author Sam Lantinga <slouken@libsdl.org>
Wed, 01 Feb 2006 06:32:25 +0000
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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/*
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 *	IKBD 6301 interrupt routine
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 *
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 *	Patrice Mandin
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 */
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	.text
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	.globl	_SDL_AtariIkbdInstall
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	.globl	_SDL_AtariIkbdUninstall
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	.globl	_SDL_AtariIkbd_keyboard
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	.globl	_SDL_AtariIkbd_mouseb
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	.globl	_SDL_AtariIkbd_mousex
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	.globl	_SDL_AtariIkbd_mousey
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	.globl	_SDL_AtariIkbd_joystick
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	.globl	_SDL_AtariIkbd_enabled
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/*--- Install our IKBD vector ---*/
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_SDL_AtariIkbdInstall:
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	moveml	d0-d1/a0-a1,sp@-
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	| Disable interrupts
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	movew	#0x2700,sr
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	| Save MFP registers used for keyboard
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	lea	0xfffffa00:w,a0
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	btst	#6,a0@(0x09)
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	sne		ikbd_ierb
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	btst	#6,a0@(0x15)
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	sne		ikbd_imrb
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	| Set our routine
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	movel	0x118:w,old_ikbd
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	movel	#ikbd,0x118:w
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	bset	#6,0xfffffa09:w	| IERB
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	bset	#6,0xfffffa15:w	| IMRB
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	| Set mouse relative mode
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	moveb	#8,0xfffffc02:w
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	| Reenable interrupts
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	movew	#0x2300,sr
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	| Interrupts done
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	movew	#0xffff,_SDL_AtariIkbd_enabled
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	moveml	sp@+,d0-d1/a0-a1
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	rts
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/*--- Uninstall our IKBD vector ---*/
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_SDL_AtariIkbdUninstall:
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	movel	a0,sp@-
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	| Disable interrupts
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	movew	#0x2700,sr
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	| Restore previous MFP registers
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	lea	0xfffffa00:w,a0
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	bclr	#6,a0@(0x09)
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	tstb	ikbd_ierb
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	beqs	ikbd_restoreierb
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	bset	#6,a0@(0x09)
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ikbd_restoreierb:
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	bclr	#6,a0@(0x15)
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	tstb	ikbd_imrb
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	beqs	ikbd_restoreimrb
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	bset	#6,a0@(0x15)
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ikbd_restoreimrb:
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	movel	old_ikbd,0x118:w
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	| Clear keyboard buffer
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	lea	0xfffffc00:w,a0
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ikbd_videbuffer:
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	btst	#0,a0@
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	beqs	ikbd_finbuffer
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	tstb	a0@(0x02)
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	bras	ikbd_videbuffer
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ikbd_finbuffer:
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	| Reenable interrupts
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	movew	#0x2300,sr
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	movel	sp@+,a0
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	rts
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	.bss
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	.even
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	.comm	ikbd_ierb,1
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	.comm	ikbd_imrb,1
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/*--- Our custom IKBD vector ---*/
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	.text
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	.even
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	.ascii	"XBRA"
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	.ascii	"LSDL"
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   137
	.comm	old_ikbd,4*1
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ikbd:
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	| Check if source is IKBD or MIDI
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	btst	#0,0xfffffc00.w
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	beqs	ikbd_oldmidi
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281
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	moveml	d0-d1/a0,sp@-
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	moveb	0xfffffc02:w,d0
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	| Joystick packet ?
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   147
	
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	cmpb	#0xff,d0
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	beqs	ikbd_yes_joystick
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	| Mouse packet ?
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	cmpb	#0xf8,d0
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	bmis	ikbd_no_mouse
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	cmpb	#0xfc,d0
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	bpls	ikbd_no_mouse
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	| Mouse packet, byte #1
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281
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ikbd_yes_mouse:
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	andw	#3,d0
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	movew	d0,_SDL_AtariIkbd_mouseb
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	movel	#ikbd_mousex,0x118:w
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	bras	ikbd_endit_stack
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	| Joystick packet, byte #1
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281
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ikbd_yes_joystick:
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	movel	#ikbd_joystick,0x118:w
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	bras	ikbd_endit_stack
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	| Keyboard press/release
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281
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ikbd_no_mouse:
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	moveb	d0,d1
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	lea		_SDL_AtariIkbd_keyboard,a0
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	andw	#0x7f,d1
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	tas		d0
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	spl		a0@(0,d1:w)
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	| End of interrupt
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ikbd_endit_stack:
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	moveml	sp@+,d0-d1/a0
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ikbd_endit:
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	bclr	#6,0xfffffa11:w
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	rte
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	| Call old MIDI interrupt
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ikbd_oldmidi:
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	movel	old_ikbd,sp@-
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	rts
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	| Mouse packet, byte #2
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281
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ikbd_mousex:
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	| Check if source is IKBD or MIDI
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	btst	#0,0xfffffc00.w
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	beqs	ikbd_oldmidi
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	movew	d0,sp@-
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	moveb	0xfffffc02:w,d0
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	extw	d0
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	addw	d0,_SDL_AtariIkbd_mousex
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	movew	sp@+,d0
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	movel	#ikbd_mousey,0x118:w
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	bras	ikbd_endit
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	| Mouse packet, byte #3
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281
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ikbd_mousey:
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	| Check if source is IKBD or MIDI
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	btst	#0,0xfffffc00.w
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	beqs	ikbd_oldmidi
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	movew	d0,sp@-
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	moveb	0xfffffc02:w,d0
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	extw	d0
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	addw	d0,_SDL_AtariIkbd_mousey
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	movew	sp@+,d0
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	movel	#ikbd,0x118:w
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	bras	ikbd_endit
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	| Joystick packet, byte #2
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281
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ikbd_joystick:
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	| Check if source is IKBD or MIDI
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	btst	#0,0xfffffc00.w
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	beqs	ikbd_oldmidi
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281
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	moveb	0xfffffc02:w,_SDL_AtariIkbd_joystick+1
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	movel	#ikbd,0x118:w
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	bras	ikbd_endit
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	.data
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	.even
305
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_SDL_AtariIkbd_enabled:
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	.word	0
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	.bss
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305
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	.even
281
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	.comm	_SDL_AtariIkbd_keyboard,128
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	.comm	_SDL_AtariIkbd_mousex,2
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	.comm	_SDL_AtariIkbd_mousey,2
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	.comm	_SDL_AtariIkbd_mouseb,2
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	.comm	_SDL_AtariIkbd_joystick,2