NetBSD-5.0.2/sys/arch/mvme68k/mvme68k/isr.c
/* $NetBSD: isr.c,v 1.32 2008/04/28 20:23:29 martin 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.
*
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: isr.c,v 1.32 2008/04/28 20:23:29 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/vmmeter.h>
#include <sys/device.h>
#include <sys/cpu.h>
#include <uvm/uvm_extern.h>
#include <mvme68k/mvme68k/isr.h>
volatile unsigned int interrupt_depth;
isr_autovec_list_t isr_autovec[NISRAUTOVEC];
struct isr_vectored isr_vectored[NISRVECTORED];
static const char irqgroupname[] = "hard irqs";
struct evcnt mvme68k_irq_evcnt[] = {
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, irqgroupname, "spur"),
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, irqgroupname, "lev1"),
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, irqgroupname, "lev2"),
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, irqgroupname, "lev3"),
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, irqgroupname, "lev4"),
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, irqgroupname, "lev5"),
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, irqgroupname, "lev6"),
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, irqgroupname, "nmi")
};
static int idepth;
extern int intrcnt[]; /* from locore.s. XXXSCW: will go away soon */
extern void (*vectab[])(void);
extern void badtrap(void);
extern void intrhand_vectored(void);
static int spurintr(void *);
void
isrinit(void)
{
int i;
/* Initialize the autovector lists. */
for (i = 0; i < NISRAUTOVEC; ++i)
LIST_INIT(&isr_autovec[i]);
/* Initialise the interrupt event counts */
for (i = 0; i < (sizeof(mvme68k_irq_evcnt) / sizeof(struct evcnt)); i++)
evcnt_attach_static(&mvme68k_irq_evcnt[i]);
/* Arrange to trap Spurious and NMI auto-vectored Interrupts */
isrlink_autovec(spurintr, NULL, 0, 0, NULL);
isrlink_autovec(nmihand, NULL, 7, 0, NULL);
}
/*
* Establish an autovectored interrupt handler.
* Called by driver attach functions.
*/
void
isrlink_autovec(int (*func)(void *), void *arg, int ipl, int priority,
struct evcnt *evcnt)
{
struct isr_autovec *newisr, *curisr;
isr_autovec_list_t *list;
#ifdef DIAGNOSTIC
if ((ipl < 0) || (ipl >= NISRAUTOVEC))
panic("%s: bad ipl %d", __func__, ipl);
#endif
newisr = malloc(sizeof(struct isr_autovec), M_DEVBUF, M_NOWAIT);
if (newisr == NULL)
panic("%s: can't allocate space for isr", __func__);
/* Fill in the new entry. */
newisr->isr_func = func;
newisr->isr_arg = arg;
newisr->isr_ipl = ipl;
newisr->isr_priority = priority;
newisr->isr_evcnt = evcnt;
/*
* 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->lh_first == NULL) {
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->lh_first; curisr->isr_link.le_next != NULL;
curisr = curisr->isr_link.le_next) {
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);
}
/*
* Establish a vectored interrupt handler.
* Called by bus interrupt establish functions.
*/
void
isrlink_vectored(int (*func)(void *), void *arg, int ipl, int vec,
struct evcnt *evcnt)
{
struct isr_vectored *isr;
#ifdef DIAGNOSTIC
if ((ipl < 0) || (ipl >= NISRAUTOVEC))
panic("%s: bad ipl %d", __func__, ipl);
if ((vec < ISRVECTORED) || (vec >= ISRVECTORED + NISRVECTORED))
panic("%s: bad vec 0x%x", __func__, vec);
#endif
isr = &isr_vectored[vec - ISRVECTORED];
#ifdef DIAGNOSTIC
if ((vectab[vec] != badtrap) || (isr->isr_func != NULL))
panic("%s: vec 0x%x not available", __func__, vec);
#endif
/* Fill in the new entry. */
isr->isr_func = func;
isr->isr_arg = arg;
isr->isr_ipl = ipl;
isr->isr_evcnt = evcnt;
/* Hook into the vector table. */
vectab[vec] = intrhand_vectored;
}
/*
* Return a pointer to the evcnt structure for
* the specified ipl.
*/
struct evcnt *
isrlink_evcnt(int ipl)
{
#ifdef DIAGNOSTIC
if (ipl < 0 ||
ipl >= (sizeof(mvme68k_irq_evcnt) / sizeof(struct evcnt)))
panic("%s: bad ipl %d", __func__, ipl);
#endif
return &mvme68k_irq_evcnt[ipl];
}
/*
* Unhook a vectored interrupt.
*/
void
isrunlink_vectored(int vec)
{
#ifdef DIAGNOSTIC
if ((vec < ISRVECTORED) || (vec >= ISRVECTORED + NISRVECTORED))
panic("%s: bad vec 0x%x", __func__, vec);
if (vectab[vec] != intrhand_vectored)
panic("%s: not vectored interrupt", __func__);
#endif
vectab[vec] = badtrap;
memset(&isr_vectored[vec - ISRVECTORED], 0,
sizeof(struct isr_vectored));
}
/*
* This is the dispatcher called by the low-level
* assembly language autovectored interrupt routine.
*/
void
isrdispatch_autovec(struct clockframe *frame)
{
struct isr_autovec *isr;
isr_autovec_list_t *list;
int handled, ipl;
void *arg;
static int straycount, unexpected;
idepth++;
ipl = (frame->vec >> 2) - ISRAUTOVEC;
#ifdef DIAGNOSTIC
if ((ipl < 0) || (ipl >= NISRAUTOVEC))
panic("%s: bad vec 0x%x", __func__, frame->vec);
#endif
intrcnt[ipl]++; /* XXXSCW: Will go away soon */
mvme68k_irq_evcnt[ipl].ev_count++;
uvmexp.intrs++;
list = &isr_autovec[ipl];
if (list->lh_first == NULL) {
printf("%s: ipl %d unexpected\n", __func__, ipl);
if (++unexpected > 10)
panic("too many unexpected interrupts");
idepth--;
return;
}
/* Give all the handlers a chance. */
handled = 0;
for (isr = list->lh_first ; isr != NULL; isr = isr->isr_link.le_next) {
arg = isr->isr_arg ? isr->isr_arg : frame;
if ((*isr->isr_func)(arg) != 0) {
if (isr->isr_evcnt)
isr->isr_evcnt->ev_count++;
handled++;
}
}
if (handled)
straycount = 0;
else if (++straycount > 50)
panic("%s: too many stray interrupts", __func__);
else
printf("%s: stray level %d interrupt\n", __func__, ipl);
idepth--;
}
/*
* This is the dispatcher called by the low-level
* assembly language vectored interrupt routine.
*/
void
isrdispatch_vectored(int ipl, struct clockframe *frame)
{
struct isr_vectored *isr;
int vec;
idepth++;
vec = (frame->vec >> 2) - ISRVECTORED;
#ifdef DIAGNOSTIC
if ((vec < 0) || (vec >= NISRVECTORED))
panic("%s: bad vec 0x%x", __func__, frame->vec);
#endif
isr = &isr_vectored[vec];
intrcnt[ipl]++; /* XXXSCW: Will go away soon */
mvme68k_irq_evcnt[ipl].ev_count++;
uvmexp.intrs++;
if (isr->isr_func == NULL) {
printf("%s: no handler for vec 0x%x\n", __func__, frame->vec);
vectab[vec + ISRVECTORED] = badtrap;
idepth--;
return;
}
/*
* Handler gets exception frame if argument is NULL.
*/
if ((*isr->isr_func)(isr->isr_arg ? isr->isr_arg : frame) == 0)
printf("%s: vec 0x%x not claimed\n", __func__, frame->vec);
else if (isr->isr_evcnt)
isr->isr_evcnt->ev_count++;
idepth--;
}
bool
cpu_intr_p(void)
{
return idepth != 0;
}
/* ARGSUSED */
static int
spurintr(void *arg)
{
return 1;
}