NetBSD/sys/arch/macppc/include/intr.h

/*	$NetBSD: intr.h,v 1.1 1998/05/15 10:15:53 tsubai Exp $	*/
/*	$OpenBSD: intr.h,v 1.1 1997/10/13 10:53:45 pefo Exp $ */

/*
 * Copyright (c) 1996, 1997 Charles M. Hannum.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Charles M. Hannum.
 * 4. 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 _POWERMAC_INTR_H_
#define _POWERMAC_INTR_H_

/* Interrupt priority `levels'. */
#define	IPL_NONE	9	/* nothing */
#define	IPL_SOFTCLOCK	8	/* timeouts */
#define	IPL_SOFTNET	7	/* protocol stacks */
#define	IPL_BIO		6	/* block I/O */
#define	IPL_NET		5	/* network */
#define	IPL_SOFTSERIAL	4	/* serial */
#define	IPL_TTY		3	/* terminal */
#define	IPL_IMP		3	/* memory allocation */
#define	IPL_AUDIO	2	/* audio */
#define	IPL_CLOCK	1	/* clock */
#define	IPL_HIGH	1	/* everything */
#define	IPL_SERIAL	0	/* serial */
#define	NIPL		10

/* Interrupt sharing types. */
#define	IST_NONE	0	/* none */
#define	IST_PULSE	1	/* pulsed */
#define	IST_EDGE	2	/* edge-triggered */
#define	IST_LEVEL	3	/* level-triggered */

#ifndef _LOCORE

/*
 * Interrupt handler chains.  intr_establish() inserts a handler into
 * the list.  The handler is called with its (single) argument.
 */
struct intrhand {
	int	(*ih_fun) __P((void *));
	void	*ih_arg;
	u_long	ih_count;
	struct	intrhand *ih_next;
	int	ih_level;
	int	ih_irq;
};

void setsoftclock __P((void));
void clearsoftclock __P((void));
int  splsoftclock __P((void));
void setsoftnet   __P((void));
void clearsoftnet __P((void));
int  splsoftnet   __P((void));

void do_pending_int __P((void));

static __inline int splraise __P((int));
static __inline int spllower __P((int));
static __inline void splx __P((int));
static __inline void softintr __P((int));

extern volatile int cpl, ipending, astpending, tickspending;
extern int imask[];

/*
 *  Reorder protection in the following inline functions is
 * achived with the "eieio" instruction which the assembler
 * seems to detect and then doen't move instructions past....
 */
static __inline int
splraise(ncpl)
	int ncpl;
{
	int ocpl;

	__asm__ volatile("sync; eieio\n");	/* don't reorder.... */
	ocpl = cpl;
	cpl = ocpl | ncpl;
	__asm__ volatile("sync; eieio\n");	/* reorder protect */
	return (ocpl);
}

static __inline void
splx(ncpl)
	int ncpl;
{

	__asm__ volatile("sync; eieio\n");	/* reorder protect */
	cpl = ncpl;
	if (ipending & ~ncpl)
		do_pending_int();
	__asm__ volatile("sync; eieio\n");	/* reorder protect */
}

static __inline int
spllower(ncpl)
	int ncpl;
{
	int ocpl;

	__asm__ volatile("sync; eieio\n");	/* reorder protect */
	ocpl = cpl;
	cpl = ncpl;
	if (ipending & ~ncpl)
		do_pending_int();
	__asm__ volatile("sync; eieio\n");	/* reorder protect */
	return (ocpl);
}

/* Following code should be implemented with lwarx/stwcx to avoid
 * the disable/enable. i need to read the manual once more.... */
static __inline void
softintr(ipl)
	int ipl;
{
	int msrsave;

	__asm__ volatile("mfmsr %0" : "=r"(msrsave));
	__asm__ volatile("mtmsr %0" :: "r"(msrsave & ~PSL_EE));
	ipending |= 1 << ipl;
	__asm__ volatile("mtmsr %0" :: "r"(msrsave));
}

#define	ICU_LEN		32

/* Soft interrupt masks. */
#define SIR_CLOCK	28
#define SIR_NET		29
#define SIR_SERIAL	30
#define SPL_CLOCK	31

/*
 * Hardware interrupt masks
 */
#define splbio()	splraise(imask[IPL_BIO])
#define splnet()	splraise(imask[IPL_NET])
#define spltty()	splraise(imask[IPL_TTY])
#define	splaudio()	splraise(imask[IPL_AUDIO])
#define splclock()	splraise(imask[IPL_CLOCK])
#define splstatclock()	splclock()
#define	splserial()	splraise(imask[IPL_SERIAL])

/*
 * Software interrupt masks
 *
 * NOTE: splsoftclock() is used by hardclock() to lower the priority from
 * clock to softclock before it calls softclock().
 */
#define	splsoftclock()	spllower(imask[IPL_SOFTCLOCK])
#define	splsoftnet()	splraise(imask[IPL_SOFTNET])
#define	splsoftserial()	splraise(imask[IPL_SOFTSERIAL])

/*
 * Miscellaneous
 */
#define splimp()	splraise(imask[IPL_IMP])
#define	splhigh()	splraise(imask[IPL_HIGH])
#define	spl0()		spllower(0)

#define	setsoftclock()	softintr(SIR_CLOCK)
#define	setsoftnet()	softintr(SIR_NET)
#define	setsoftserial()	softintr(SIR_SERIAL)

#endif /* !_LOCORE */

#endif /* !_POWERMAC_INTR_H_ */