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/* $OpenBSD: isr.c,v 1.6 2005/12/12 19:15:19 miod Exp $ */
/* $NetBSD: isr.c,v 1.5 2000/07/09 08:08:20 nisimura Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Glass, Gordon W. Ross, and 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*/
/*
* Link and dispatch interrupts.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/vmmeter.h>
#include <sys/evcount.h>
#include <uvm/uvm_extern.h>
#include <net/netisr.h>
#include <machine/cpu.h>
#include <luna88k/luna88k/isr.h>
isr_autovec_list_t isr_autovec[NISRAUTOVEC];
void
isrinit()
{
int i;
/* Initialize the autovector lists. */
for (i = 0; i < NISRAUTOVEC; ++i) {
LIST_INIT(&isr_autovec[i]);
}
}
/*
* Establish an autovectored interrupt handler.
* Called by driver attach functions.
*/
void
isrlink_autovec(int (*func)(void *), void *arg, int ipl, int priority,
const char *name)
{
struct isr_autovec *newisr, *curisr;
isr_autovec_list_t *list;
#ifdef DIAGNOSTIC
if (ipl < 0 || ipl >= NISRAUTOVEC)
panic("isrlink_autovec: bad ipl %d", ipl);
#endif
newisr = (struct isr_autovec *)malloc(sizeof(struct isr_autovec),
M_DEVBUF, M_NOWAIT);
if (newisr == NULL)
panic("isrlink_autovec: can't allocate space for isr");
/* Fill in the new entry. */
newisr->isr_func = func;
newisr->isr_arg = arg;
newisr->isr_ipl = ipl;
newisr->isr_priority = priority;
evcount_attach(&newisr->isr_count, name, (void *)&newisr->isr_ipl,
&evcount_intr);
/*
* Some devices are particularly sensitive to interrupt
* handling latency. The SCC, for example, can lose many
* characters if its interrupt isn't handled with reasonable
* speed.
*
* To work around this problem, each device can give itself a
* "priority". An unbuffered SCC would give itself a higher
* priority than a SCSI device, for example.
*
* This solution was originally developed for the hp300, which
* has a flat spl scheme (by necessity). Thankfully, the
* MVME systems don't have this problem, though this may serve
* a useful purpose in any case.
*/
/*
* Get the appropriate ISR list. If the list is empty, no
* additional work is necessary; we simply insert ourselves
* at the head of the list.
*/
list = &isr_autovec[ipl];
if (LIST_EMPTY(list)) {
LIST_INSERT_HEAD(list, newisr, isr_link);
return;
}
/*
* A little extra work is required. We traverse the list
* and place ourselves after any ISRs with our current (or
* higher) priority.
*/
for (curisr = LIST_FIRST(list); LIST_NEXT(curisr, isr_link) != NULL;
curisr = LIST_NEXT(curisr, isr_link)) {
if (newisr->isr_priority > curisr->isr_priority) {
LIST_INSERT_BEFORE(curisr, newisr, isr_link);
return;
}
}
/*
* We're the least important entry, it seems. We just go
* on the end.
*/
LIST_INSERT_AFTER(curisr, newisr, isr_link);
}
/*
* This is the dispatcher called by the low-level
* assembly language autovectored interrupt routine.
*/
void
isrdispatch_autovec(int ipl)
{
struct isr_autovec *isr;
isr_autovec_list_t *list;
int rc, handled = 0;
static int straycount, unexpected;
#ifdef DIAGNOSTIC
if (ipl < 0 || ipl >= NISRAUTOVEC)
panic("isrdispatch_autovec: bad ipl 0x%d", ipl);
#endif
#if 0 /* XXX: already counted in machdep.c */
uvmexp.intrs++;
#endif
list = &isr_autovec[ipl];
if (LIST_EMPTY(list)) {
printf("isrdispatch_autovec: ipl %d unexpected\n", ipl);
if (++unexpected > 10)
panic("too many unexpected interrupts");
return;
}
/* Give all the handlers a chance. */
LIST_FOREACH(isr, list, isr_link) {
rc = (*isr->isr_func)(isr->isr_arg);
if (rc != 0)
isr->isr_count.ec_count++;
handled |= rc;
}
if (handled)
straycount = 0;
else if (++straycount > 50)
panic("isr_dispatch_autovec: too many stray interrupts");
else
printf("isrdispatch_autovec: stray level %d interrupt\n", ipl);
}
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