/* $NetBSD: intr.h,v 1.72 2017/01/14 00:35:37 christos Exp $ */

/*-
 * Copyright (c) 2000, 2001, 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Copyright (c) 1997 Christopher G. Demetriou.  All rights reserved.
 * Copyright (c) 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#ifndef _ALPHA_INTR_H_
#define _ALPHA_INTR_H_

#include <sys/evcnt.h>
#include <machine/cpu.h>

/*
 * The Alpha System Control Block.  This is 8k long, and you get
 * 16 bytes per vector (i.e. the vector numbers are spaced 16
 * apart).
 *
 * This is sort of a "shadow" SCB -- rather than the CPU jumping
 * to (SCBaddr + (16 * vector)), like it does on the VAX, we get
 * a vector number in a1.  We use the SCB to look up a routine/arg
 * and jump to it.
 *
 * Since we use the SCB only for I/O interrupts, we make it shorter
 * than normal, starting it at vector 0x800 (the start of the I/O
 * interrupt vectors).
 */
#define	SCB_IOVECBASE	0x0800
#define	SCB_VECSIZE	0x0010
#define	SCB_SIZE	0x2000

#define	SCB_VECTOIDX(x)	((x) >> 4)
#define	SCB_IDXTOVEC(x)	((x) << 4)

#define	SCB_NIOVECS	SCB_VECTOIDX(SCB_SIZE - SCB_IOVECBASE)

struct scbvec {
	void	(*scb_func)(void *, u_long);
	void	*scb_arg;
};

/*
 * Alpha interrupts come in at one of 4 levels:
 *
 *	software interrupt level
 *	i/o level 1
 *	i/o level 2
 *	clock level
 *
 * However, since we do not have any way to know which hardware
 * level a particular i/o interrupt comes in on, we have to
 * whittle it down to 3.
 */

#define	IPL_NONE	0	/* no interrupt level */
#define	IPL_SOFTCLOCK	1	/* generic software interrupts */
#define	IPL_SOFTBIO	1	/* generic software interrupts */
#define	IPL_SOFTNET	1	/* generic software interrupts */
#define	IPL_SOFTSERIAL	1	/* generic software interrupts */
#define	IPL_VM		2	/* interrupts that can alloc mem */
#define	IPL_SCHED	3	/* clock interrupts */
#define	IPL_HIGH	4	/* all interrupts */

typedef int ipl_t;
typedef struct {
	uint8_t _psl;
} ipl_cookie_t;

ipl_cookie_t makeiplcookie(ipl_t);

#define	IST_UNUSABLE	-1	/* interrupt cannot be used */
#define	IST_NONE	0	/* none (dummy) */
#define	IST_PULSE	1	/* pulsed */
#define	IST_EDGE	2	/* edge-triggered */
#define	IST_LEVEL	3	/* level-triggered */

#ifdef	_KERNEL

/* Simulated software interrupt register. */
extern volatile unsigned long ssir;

/* IPL-lowering/restoring macros */
void	spl0(void);

static __inline void
splx(int s)
{
	if (s == ALPHA_PSL_IPL_0 && ssir != 0)
		spl0();
	else
		alpha_pal_swpipl(s);
}
/* IPL-raising functions/macros */
static __inline int
_splraise(int s)
{
	int cur = alpha_pal_rdps() & ALPHA_PSL_IPL_MASK;
	return (s > cur ? (int)alpha_pal_swpipl(s) : cur);
}

#define	splraiseipl(icookie)	_splraise((icookie)._psl)

#include <sys/spl.h>

/*
 * Interprocessor interrupts.  In order how we want them processed.
 */
#define	ALPHA_IPI_HALT			(1UL << 0)
#define	ALPHA_IPI_MICROSET		(1UL << 1)
#define	ALPHA_IPI_SHOOTDOWN		(1UL << 2)
#define	ALPHA_IPI_IMB			(1UL << 3)
#define	ALPHA_IPI_AST			(1UL << 4)
#define	ALPHA_IPI_PAUSE			(1UL << 5)
#define	ALPHA_IPI_XCALL			(1UL << 6)
#define	ALPHA_IPI_GENERIC		(1UL << 7)

#define	ALPHA_NIPIS			8	/* must not exceed 64 */

struct cpu_info;
struct trapframe;

void	alpha_ipi_init(struct cpu_info *);
void	alpha_ipi_process(struct cpu_info *, struct trapframe *);
void	alpha_send_ipi(unsigned long, unsigned long);
void	alpha_broadcast_ipi(unsigned long);
void	alpha_multicast_ipi(unsigned long, unsigned long);

/*
 * Alpha shared-interrupt-line common code.
 */

struct alpha_shared_intrhand {
	TAILQ_ENTRY(alpha_shared_intrhand)
		ih_q;
	struct alpha_shared_intr *ih_intrhead;
	int	(*ih_fn)(void *);
	void	*ih_arg;
	int	ih_level;
	unsigned int ih_num;
};

struct alpha_shared_intr {
	TAILQ_HEAD(,alpha_shared_intrhand)
		intr_q;
	struct evcnt intr_evcnt;
	char	*intr_string;
	void	*intr_private;
	int	intr_sharetype;
	int	intr_dfltsharetype;
	int	intr_nstrays;
	int	intr_maxstrays;
};

#define	ALPHA_SHARED_INTR_DISABLE(asi, num)				\
	((asi)[num].intr_maxstrays != 0 &&				\
	 (asi)[num].intr_nstrays == (asi)[num].intr_maxstrays)

void	softintr_dispatch(void);

struct alpha_shared_intr *alpha_shared_intr_alloc(unsigned int, unsigned int);
int	alpha_shared_intr_dispatch(struct alpha_shared_intr *,
	    unsigned int);
void	*alpha_shared_intr_establish(struct alpha_shared_intr *,
	    unsigned int, int, int, int (*)(void *), void *, const char *);
void	alpha_shared_intr_disestablish(struct alpha_shared_intr *,
	    void *, const char *);
int	alpha_shared_intr_get_sharetype(struct alpha_shared_intr *,
	    unsigned int);
int	alpha_shared_intr_isactive(struct alpha_shared_intr *,
	    unsigned int);
int	alpha_shared_intr_firstactive(struct alpha_shared_intr *,
	    unsigned int);
void	alpha_shared_intr_set_dfltsharetype(struct alpha_shared_intr *,
	    unsigned int, int);
void	alpha_shared_intr_set_maxstrays(struct alpha_shared_intr *,
	    unsigned int, int);
void	alpha_shared_intr_reset_strays(struct alpha_shared_intr *,
	    unsigned int);
void	alpha_shared_intr_stray(struct alpha_shared_intr *, unsigned int,
	    const char *);
void	alpha_shared_intr_set_private(struct alpha_shared_intr *,
	    unsigned int, void *);
void	*alpha_shared_intr_get_private(struct alpha_shared_intr *,
	    unsigned int);
char	*alpha_shared_intr_string(struct alpha_shared_intr *,
	    unsigned int);
struct evcnt *alpha_shared_intr_evcnt(struct alpha_shared_intr *,
	    unsigned int);

extern struct scbvec scb_iovectab[];

void	scb_init(void);
void	scb_set(u_long, void (*)(void *, u_long), void *, int);
u_long	scb_alloc(void (*)(void *, u_long), void *);
void	scb_free(u_long);

#define	SCB_ALLOC_FAILED	((u_long) -1)

#endif /* _KERNEL */
#endif /* ! _ALPHA_INTR_H_ */
