src/timer/mint/SDL_vbltimer.S
author Sam Lantinga <slouken@libsdl.org>
Wed, 27 Feb 2002 16:15:34 +0000
changeset 287 e4bd0cf95506
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child 297 f6ffac90895c
permissions -rw-r--r--
From: Patrice Mandin <pmandin@caramail.com> Subject: [SDL] [PATCH] Little cleanups for Atari port
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001  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 Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 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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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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/*
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 *	VBL queue routine
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 *
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 *	Patrice Mandin
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 */
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#define _vbl_queue 0x456
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	.text
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	.globl	_SDL_AtariVblInstall
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	.globl	_SDL_AtariVblUninstall
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/*--- Vector installer ---*/
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_SDL_AtariVblInstall:
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	movel	sp@(4),my_vector
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	lea		_my_vbl,a0
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	clrw	vbl_mutex
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	/* Stop interrupts */
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	movew	#0x2700,sr
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	/* Read vbl_queue pointer */
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	movel	_vbl_queue.w,a1
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	/* Search a free place */
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	moveq	#7,d0
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bcl_search_place:
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	movel	(a1),d1
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	beqs	place_found
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	addql	#4,a1
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	dbra	d0,bcl_search_place
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	/* Not found */
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	moveq	#1,d0
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	bras	exit_vbl_queue
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	/* Then install ourselves */
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place_found:
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	movel	a0,(a1)
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	moveq	#0,d0	
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exit_vbl_queue:
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	/* Restart interrupts */
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	movew	#0x2300,sr
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	rts
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/*--- Vector uninstaller ---*/
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_SDL_AtariVblUninstall:
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	movel	sp@(4),d0
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	cmpl	my_vector,d0
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	bnes	badvector
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	movel	#_my_vbl,d0
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	/* Stop interrupts */
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	movew	#0x2700,sr
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	/* Read vbl_queue pointer */
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	movel	_vbl_queue.w,a1
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	/* Search where we are */
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	moveq	#7,d1
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bcl2_search_place:
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	cmpl	(a1),d0
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	bnes	next_place
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	clrl	(a1)
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	moveq	#0,d1
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next_place:
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	addql	#4,a1
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	dbra	d1,bcl2_search_place
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	/* Restart interrupts */
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	movew	#0x2300,sr
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badvector:
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	rts
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/*--- Our vbl ---*/
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_my_vbl:
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	/* Verify if this is not already running */
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	tstw	vbl_mutex
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	bnes	vbl_end
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	notw	vbl_mutex
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	moveml	d0-d7/a0-a6,sp@-
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	movel	my_vector,a0
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	jsr		a0@
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	moveml	sp@+,d0-d7/a0-a6
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	clrw	vbl_mutex
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vbl_end:
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	rts
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	.data
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	.even
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	.comm	vbl_mutex,2*1
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	.even
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	.comm	my_vector,4*1