/*	$OpenBSD: intr.h,v 1.8 2003/01/05 01:51:27 miod Exp $	*/
/*	$NetBSD: intr.h,v 1.8 1997/11/07 07:33:18 scottr Exp $	*/

/*
 * Copyright (C) 1997 Scott Reynolds
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _MAC68K_INTR_H_
#define _MAC68K_INTR_H_

#ifdef _KERNEL
/*
 * spl functions; all but spl0 are done in-line
 */

#define _spl(s)								\
({									\
        register int _spl_r;						\
									\
        __asm __volatile ("clrl %0; movew sr,%0; movew %1,sr" :		\
                "=&d" (_spl_r) : "di" (s));				\
        _spl_r;								\
})

#define _splraise(s)							\
({									\
	int _spl_r;							\
									\
	__asm __volatile ("						\
		clrl	d0					;	\
		movw	sr,d0					;	\
		movl	d0,%0					;	\
		andw	#0x700,d0				;	\
		movw	%1,d1					;	\
		andw	#0x700,d1				;	\
		cmpw	d0,d1					;	\
		jle	1f					;	\
		movw	%1,sr					;	\
	    1:"							:	\
		    "=&d" (_spl_r)				:	\
		    "di" (s)					:	\
		    "d0", "d1");					\
	_spl_r;								\
})

/* spl0 requires checking for software interrupts */
#define spl1()  _spl(PSL_S|PSL_IPL1)
#define spl2()  _spl(PSL_S|PSL_IPL2)
#define spl3()  _spl(PSL_S|PSL_IPL3)
#define spl4()  _spl(PSL_S|PSL_IPL4)
#define spl5()  _spl(PSL_S|PSL_IPL5)
#define spl6()  _spl(PSL_S|PSL_IPL6)
#define spl7()  _spl(PSL_S|PSL_IPL7)

/* These spl calls are _not_ to be used by machine-independent code. */
#define	spladb()	splhigh()
#define	splzs()		splserial()
#define	splsoft()	spl1()

/*
 * splnet must block hardware network interrupts
 * splimp must be > spltty
 */
extern unsigned short	mac68k_ttyipl;
extern unsigned short	mac68k_bioipl;
extern unsigned short	mac68k_netipl;
extern unsigned short	mac68k_impipl;
extern unsigned short	mac68k_clockipl;
extern unsigned short	mac68k_statclockipl;

/*
 * Interrupt "levels".  These are a more abstract representation
 * of interrupt levels, and do not have the same meaning as m68k
 * CPU interrupt levels.  They serve two purposes:
 *
 *	- properly order ISRs in the list for that CPU ipl
 *	- compute CPU PSL values for the spl*() calls.
 */
#define	IPL_NONE	0
#define	IPL_SOFTNET	1
#define	IPL_SOFTCLOCK	1
#define	IPL_BIO		PSLTOIPL(mac68k_bioipl)
#define	IPL_NET		PSLTOIPL(mac68k_netipl)
#define	IPL_TTY		PSLTOIPL(mac68k_ttyipl)
#define	IPL_CLOCK	PSLTOIPL(mac68k_clockipl)
#define	IPL_STATCLOCK	PSLTOIPL(mac68k_statclockipl)
#define	IPL_HIGH	7

/*
 * These should be used for:
 * 1) ensuring mutual exclusion (why use processor level?)
 * 2) allowing faster devices to take priority
 *
 * Note that on the Mac, most things are masked at spl1, almost
 * everything at spl2, and everything but the panic switch and
 * power at spl4.
 */
#define	spllowersoftclock()	splsoft()
#define	splsoftclock()		splsoft()
#define	splsoftnet()		splsoft()
#define	spltty()		_splraise(mac68k_ttyipl)
#define	splbio()		_splraise(mac68k_bioipl)
#define	splnet()		_splraise(mac68k_netipl)
#define	splimp()		_splraise(mac68k_impipl)
#define	splvm()			_splraise(mac68k_impipl)
#define	splclock()		_splraise(mac68k_clockipl)
#define	splstatclock()		_splraise(mac68k_statclockipl)
#define	splserial()		spl4()
#define	splhigh()		spl7()

/* watch out for side effects */
#define splx(s)         ((s) & PSL_IPL ? _spl(s) : spl0())

/*
 * simulated software interrupt register
 */
extern volatile u_int8_t ssir;

#define	SIR_NET		0x01
#define	SIR_CLOCK	0x02
#define	SIR_SERIAL	0x04
#define SIR_DTMGR	0x08
#define SIR_ADB		0x10

#define	siron(mask)	\
	__asm __volatile ( "orb %0,_ssir" : : "i" (mask))
#define	siroff(mask)	\
	__asm __volatile ( "andb %0,_ssir" : : "ir" (~(mask)));

#define	setsoftnet()	siron(SIR_NET)
#define	setsoftclock()	siron(SIR_CLOCK)
#define	setsoftserial()	siron(SIR_SERIAL)
#define	setsoftdtmgr()	siron(SIR_DTMGR)
#define	setsoftadb()	siron(SIR_ADB)

/* locore.s */
int	spl0(void);
#endif /* _KERNEL */

#endif /* _MAC68K_INTR_H_ */