/*	$NetBSD: intr.h,v 1.4 1998/01/12 04:57:13 sakamoto 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 _BEBOX_INTR_H_
#define _BEBOX_INTR_H_

/* Interrupt priority `levels'. */
#define	IPL_NONE	9	/* nothing */
#define	IPL_SOFTCLOCK	8	/* software clock interrupt */
#define	IPL_SOFTNET	7	/* software network interrupt */
#define	IPL_BIO		6	/* block I/O */
#define	IPL_NET		5	/* network */
#define	IPL_TTY		4	/* terminal */
#define	IPL_IMP		3	/* memory allocation */
#define	IPL_AUDIO	2	/* audio */
#define	IPL_CLOCK	1	/* clock */
#define	IPL_HIGH	0	/* 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));


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(newcpl)
	int newcpl;
{
	int oldcpl;

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

static __inline void
splx(newcpl)
	int newcpl;
{
	__asm__ volatile("sync; eieio\n");	/* reorder protect */
	cpl = newcpl;
	if(ipending & ~newcpl)
		do_pending_int();
	__asm__ volatile("sync; eieio\n");	/* reorder protect */
}

static __inline int
spllower(newcpl)
	int newcpl;
{
	int oldcpl;

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

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

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

#define	ICU_LEN		32
#define	IRQ_SLAVE	2
#define	LEGAL_IRQ(x)	((x) >= 0 && (x) < ICU_LEN && (x) != IRQ_SLAVE)

#define	MOTHER_BOARD_REG	0x7ffff000
#define	CPU0_INT_MASK	0x0f0
#define	CPU1_INT_MASK	0x1f0
#define	INT_STATE_REG	0x2f0

#define	SINT_CLOCK	0x20000000
#define	SINT_NET	0x40000000
#define	SINT_SERIAL	0x80000000
#define	SPL_CLOCK	0x00000001
#define	SINT_MASK	(SINT_CLOCK|SINT_NET|SINT_SERIAL)

#define	CNT_SINT_NET	29
#define	CNT_SINT_CLOCK	30
#define	CNT_SINT_SERIAL	31
#define	CNT_CLOCK	0

#define splbio()	splraise(imask[IPL_BIO])
#define splnet()	splraise(imask[IPL_NET])
#define spltty()	splraise(imask[IPL_TTY])
#define splclock()	splraise(SPL_CLOCK|SINT_CLOCK|SINT_NET)
#define splimp()	splraise(imask[IPL_IMP])
#define	splserial()	splraise(imask[IPL_SERIAL])
#define splstatclock()	splhigh()
#define	splsoftclock()	spllower(SINT_CLOCK)
#define	splsoftnet()	splraise(SINT_NET)
#define	splsoftserial()	splraise(SINT_SERIAL)

#define	setsoftclock()	set_sint(SINT_CLOCK);
#define	setsoftnet()	set_sint(SINT_NET);
#define	setsoftserial()	set_sint(SINT_SERIAL);

#define	splhigh()	splraise(0xffffffff)
#define	spl0()		spllower(0)

#endif /* !_LOCORE */

#endif /* !_BEBOX_INTR_H_ */