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085d9ce09a
freebsd-dev/sys/i386/isa/isa.c
Steven Wallace 085d9ce09a Add #ifndef ALLOW_CONFLICT_IRQ 
Reviewed by:	jkh
1994-09-30 05:35:55 +00:00

840 lines
23 KiB
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/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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 University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* from: @(#)isa.c 7.2 (Berkeley) 5/13/91
* $Id: isa.c,v 1.25 1994/09/20 05:07:11 bde Exp $
*/
/*
* code to manage AT bus
*
* 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com):
* Fixed uninitialized variable problem and added code to deal
* with DMA page boundaries in isa_dmarangecheck(). Fixed word
* mode DMA count compution and reorganized DMA setup code in
* isa_dmastart()
*/
#include <sys/param.h>
#include <sys/systm.h> /* isn't it a joy */
#include <sys/kernel.h> /* to have three of these */
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <sys/rlist.h>
#include <machine/segments.h>
#include <vm/vm.h>
#include <machine/spl.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/isa.h>
#include <i386/isa/icu.h>
#include <i386/isa/ic/i8237.h>
#include <i386/isa/ic/i8042.h>
#include "vector.h"
/*
** Register definitions for DMA controller 1 (channels 0..3):
*/
#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */
#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */
#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */
#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */
/*
** Register definitions for DMA controller 2 (channels 4..7):
*/
#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */
#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */
#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */
#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */
/*
* Bits to specify the type and amount of conflict checking.
*/
#define CC_ATTACH (1 << 0)
#define CC_DRQ (1 << 1)
#define CC_IOADDR (1 << 2)
#define CC_IRQ (1 << 3)
#define CC_MEMADDR (1 << 4)
/*
* XXX these defines should be in a central place.
*/
#define read_eflags() ({u_long ef; \
__asm("pushfl; popl %0" : "=a" (ef)); \
ef; })
#define write_eflags(ef) __asm("pushl %0; popfl" : : "a" ((u_long)(ef)))
u_long *intr_countp[ICU_LEN];
inthand2_t *intr_handler[ICU_LEN];
u_int intr_mask[ICU_LEN];
int intr_unit[ICU_LEN];
static inthand_t *fastintr[ICU_LEN] = {
&IDTVEC(fastintr0), &IDTVEC(fastintr1),
&IDTVEC(fastintr2), &IDTVEC(fastintr3),
&IDTVEC(fastintr4), &IDTVEC(fastintr5),
&IDTVEC(fastintr6), &IDTVEC(fastintr7),
&IDTVEC(fastintr8), &IDTVEC(fastintr9),
&IDTVEC(fastintr10), &IDTVEC(fastintr11),
&IDTVEC(fastintr12), &IDTVEC(fastintr13),
&IDTVEC(fastintr14), &IDTVEC(fastintr15)
};
static inthand_t *slowintr[ICU_LEN] = {
&IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3),
&IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7),
&IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11),
&IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15)
};
static void config_isadev __P((struct isa_device *isdp, u_int *mp));
static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp,
int item, char const *whatnot, char const *reason,
char const *format));
static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp,
u_int checkbits));
static int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits));
static inthand2_t isa_strayintr;
static void register_imask __P((struct isa_device *dvp, u_int mask));
/*
* print a conflict message
*/
static void
conflict(dvp, tmpdvp, item, whatnot, reason, format)
struct isa_device *dvp;
struct isa_device *tmpdvp;
int item;
char const *whatnot;
char const *reason;
char const *format;
{
printf("%s%d not %sed due to %s conflict with %s%d at ",
dvp->id_driver->name, dvp->id_unit, whatnot, reason,
tmpdvp->id_driver->name, tmpdvp->id_unit);
printf(format, item);
printf("\n");
}
/*
* Check to see if things are alread in use, like IRQ's, I/O addresses
* and Memory addresses.
*/
static int
haveseen(dvp, tmpdvp, checkbits)
struct isa_device *dvp;
struct isa_device *tmpdvp;
u_int checkbits;
{
int status = 0;
/*
* Only check against devices that have already been found
*/
if (tmpdvp->id_alive) {
char const *whatnot;
whatnot = checkbits & CC_ATTACH ? "attach" : "prob";
/*
* Check for I/O address conflict. We can only check the
* starting address of the device against the range of the
* device that has already been probed since we do not
* know how many I/O addresses this device uses.
*/
if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) {
if ((dvp->id_iobase >= tmpdvp->id_iobase) &&
(dvp->id_iobase <=
(tmpdvp->id_iobase + tmpdvp->id_alive - 1))) {
conflict(dvp, tmpdvp, dvp->id_iobase, whatnot,
"I/O address", "0x%x");
status = 1;
}
}
/*
* Check for Memory address conflict. We can check for
* range overlap, but it will not catch all cases since the
* driver may adjust the msize paramater during probe, for
* now we just check that the starting address does not
* fall within any allocated region.
* XXX could add a second check after the probe for overlap,
* since at that time we would know the full range.
* XXX KERNBASE is a hack, we should have vaddr in the table!
*/
if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) {
if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) &&
(KERNBASE + dvp->id_maddr <=
(tmpdvp->id_maddr + tmpdvp->id_msize - 1))) {
conflict(dvp, tmpdvp, (int)dvp->id_maddr,
whatnot, "maddr", "0x%x");
status = 1;
}
}
/*
* Check for IRQ conflicts.
*/
if (checkbits & CC_IRQ && tmpdvp->id_irq) {
if (tmpdvp->id_irq == dvp->id_irq) {
conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1,
whatnot, "irq", "%d");
status = 1;
}
}
/*
* Check for DRQ conflicts.
*/
if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) {
if (tmpdvp->id_drq == dvp->id_drq) {
conflict(dvp, tmpdvp, dvp->id_drq, whatnot,
"drq", "%d");
status = 1;
}
}
}
return (status);
}
/*
* Search through all the isa_devtab_* tables looking for anything that
* conflicts with the current device.
*/
static int
haveseen_isadev(dvp, checkbits)
struct isa_device *dvp;
u_int checkbits;
{
struct isa_device *tmpdvp;
int status = 0;
for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++)
status |= haveseen(dvp, tmpdvp, checkbits);
for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++)
status |= haveseen(dvp, tmpdvp, checkbits);
for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++)
status |= haveseen(dvp, tmpdvp, checkbits);
for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++)
status |= haveseen(dvp, tmpdvp, checkbits);
return(status);
}
/*
* Configure all ISA devices
*/
void
isa_configure() {
struct isa_device *dvp;
splhigh();
enable_intr();
INTREN(IRQ_SLAVE);
printf("Probing for devices on the ISA bus:\n");
for (dvp = isa_devtab_tty; dvp->id_driver; dvp++)
config_isadev(dvp, &tty_imask);
for (dvp = isa_devtab_bio; dvp->id_driver; dvp++)
config_isadev(dvp, &bio_imask);
for (dvp = isa_devtab_net; dvp->id_driver; dvp++)
config_isadev(dvp, &net_imask);
for (dvp = isa_devtab_null; dvp->id_driver; dvp++)
config_isadev(dvp, (u_int *)NULL);
bio_imask |= SWI_CLOCK_MASK;
net_imask |= SWI_NET_MASK;
tty_imask |= SWI_TTY_MASK;
/*
* XXX we should really add the tty device to net_imask when the line is
* switched to SLIPDISC, and then remove it when it is switched away from
* SLIPDISC. No need to block out ALL ttys during a splimp when only one
* of them is running slip.
*
* XXX actually, blocking all ttys during a splimp doesn't matter so much
* with sio because the serial interrupt layer doesn't use tty_imask. Only
* non-serial ttys suffer. It's more stupid that ALL 'net's are blocked
* during spltty.
*/
#include "sl.h"
#if NSL > 0
net_imask |= tty_imask;
tty_imask = net_imask;
#endif
/* bio_imask |= tty_imask ; can some tty devices use buffers? */
#ifdef DIAGNOSTIC
printf("bio_imask %x tty_imask %x net_imask %x\n",
bio_imask, tty_imask, net_imask);
#endif
/*
* Finish initializing intr_mask[]. Note that the partly
* constructed masks aren't actually used since we're at splhigh.
* For fully dynamic initialization, register_intr() and
* unregister_intr() will have to adjust the masks for _all_
* interrupts and for tty_imask, etc.
*/
for (dvp = isa_devtab_tty; dvp->id_driver; dvp++)
register_imask(dvp, tty_imask);
for (dvp = isa_devtab_bio; dvp->id_driver; dvp++)
register_imask(dvp, bio_imask);
for (dvp = isa_devtab_net; dvp->id_driver; dvp++)
register_imask(dvp, net_imask);
for (dvp = isa_devtab_null; dvp->id_driver; dvp++)
register_imask(dvp, SWI_CLOCK_MASK);
spl0();
}
/*
* Configure an ISA device.
*/
static void
config_isadev(isdp, mp)
struct isa_device *isdp;
u_int *mp;
{
u_int checkbits;
int id_alive;
struct isa_driver *dp = isdp->id_driver;
checkbits = 0;
#ifndef ALLOW_CONFLICT_IRQ
checkbits |= CC_IRQ;
#endif
#ifndef ALLOW_CONFLICT_DRQ
checkbits |= CC_DRQ;
#endif
#ifndef ALLOW_CONFLICT_IOADDR
checkbits |= CC_IOADDR;
#endif
#ifndef ALLOW_CONFLICT_MEMADDR
checkbits |= CC_MEMADDR;
#endif
if (haveseen_isadev(isdp, checkbits))
return;
if (isdp->id_maddr) {
isdp->id_maddr -= 0xa0000; /* XXX should be a define */
isdp->id_maddr += atdevbase;
}
id_alive = (*dp->probe)(isdp);
if (id_alive) {
/*
* Only print the I/O address range if id_alive != -1
* Right now this is a temporary fix just for the new
* NPX code so that if it finds a 486 that can use trap
* 16 it will not report I/O addresses.
* Rod Grimes 04/26/94
*/
printf("%s%d", dp->name, isdp->id_unit);
if (id_alive != -1) {
printf(" at 0x%x", isdp->id_iobase);
if ((isdp->id_iobase + id_alive - 1) !=
isdp->id_iobase) {
printf("-0x%x",
isdp->id_iobase + id_alive - 1);
}
}
if (isdp->id_irq)
printf(" irq %d", ffs(isdp->id_irq) - 1);
if (isdp->id_drq != -1)
printf(" drq %d", isdp->id_drq);
if (isdp->id_maddr)
printf(" maddr 0x%lx", kvtop(isdp->id_maddr));
if (isdp->id_msize)
printf(" msize %d", isdp->id_msize);
if (isdp->id_flags)
printf(" flags 0x%x", isdp->id_flags);
if (isdp->id_iobase) {
if (isdp->id_iobase < 0x100) {
printf(" on motherboard\n");
} else {
if (isdp->id_iobase >= 0x1000) {
printf (" on eisa\n");
} else {
printf (" on isa\n");
}
}
}
/*
* Check for conflicts again. The driver may have changed
* *dvp. We should weaken the early check since the
* driver may have been able to change *dvp to avoid
* conflicts if given a chance. We already skip the early
* check for IRQs and force a check for IRQs in the next
* group of checks.
*/
#ifndef ALLOW_CONFLICT_IRQ
checkbits |= CC_IRQ;
#endif
if (haveseen_isadev(isdp, checkbits))
return;
isdp->id_alive = id_alive;
(*dp->attach)(isdp);
if (isdp->id_irq) {
if (mp)
INTRMASK(*mp, isdp->id_irq);
register_intr(ffs(isdp->id_irq) - 1, isdp->id_id,
isdp->id_ri_flags, isdp->id_intr,
mp ? *mp : 0, isdp->id_unit);
INTREN(isdp->id_irq);
}
} else {
printf("%s%d not found", dp->name, isdp->id_unit);
if (isdp->id_iobase) {
printf(" at 0x%x", isdp->id_iobase);
}
printf("\n");
}
}
/*
* Fill in default interrupt table (in case of spuruious interrupt
* during configuration of kernel, setup interrupt control unit
*/
void
isa_defaultirq()
{
int i;
/* icu vectors */
for (i = 0; i < ICU_LEN; i++)
unregister_intr(i, (inthand2_t *)NULL);
/* initialize 8259's */
outb(IO_ICU1, 0x11); /* reset; program device, four bytes */
outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */
outb(IO_ICU1+1, 1<<2); /* slave on line 2 */
#ifdef AUTO_EOI_1
outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */
#else
outb(IO_ICU1+1, 1); /* 8086 mode */
#endif
outb(IO_ICU1+1, 0xff); /* leave interrupts masked */
outb(IO_ICU1, 0x0a); /* default to IRR on read */
outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */
outb(IO_ICU2, 0x11); /* reset; program device, four bytes */
outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */
outb(IO_ICU2+1,2); /* my slave id is 2 */
#ifdef AUTO_EOI_2
outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */
#else
outb(IO_ICU2+1,1); /* 8086 mode */
#endif
outb(IO_ICU2+1, 0xff); /* leave interrupts masked */
outb(IO_ICU2, 0x0a); /* default to IRR on read */
}
/* region of physical memory known to be contiguous */
vm_offset_t isaphysmem;
static caddr_t dma_bounce[8]; /* XXX */
static char bounced[8]; /* XXX */
#define MAXDMASZ 512 /* XXX */
/* high byte of address is stored in this port for i-th dma channel */
static short dmapageport[8] =
{ 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
/*
* isa_dmacascade(): program 8237 DMA controller channel to accept
* external dma control by a board.
*/
void isa_dmacascade(unsigned chan)
{
if (chan > 7)
panic("isa_dmacascade: impossible request");
/* set dma channel mode, and set dma channel mode */
if ((chan & 4) == 0) {
outb(DMA1_MODE, DMA37MD_CASCADE | chan);
outb(DMA1_SMSK, chan);
} else {
outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3));
outb(DMA2_SMSK, chan & 3);
}
}
static int
isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan);
/*
* isa_dmastart(): program 8237 DMA controller channel, avoid page alignment
* problems by using a bounce buffer.
*/
void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan)
{ vm_offset_t phys;
int waport;
caddr_t newaddr;
if ( chan > 7
|| (chan < 4 && nbytes > (1<<16))
|| (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1)))
panic("isa_dmastart: impossible request");
if (isa_dmarangecheck(addr, nbytes, chan)) {
if (dma_bounce[chan] == 0)
dma_bounce[chan] =
/*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/
(caddr_t) isaphysmem + NBPG*chan;
bounced[chan] = 1;
newaddr = dma_bounce[chan];
*(int *) newaddr = 0; /* XXX */
/* copy bounce buffer on write */
if (!(flags & B_READ))
bcopy(addr, newaddr, nbytes);
addr = newaddr;
}
/* translate to physical */
phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr);
if ((chan & 4) == 0) {
/*
* Program one of DMA channels 0..3. These are
* byte mode channels.
*/
/* set dma channel mode, and reset address ff */
if (flags & B_READ)
outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan);
else
outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan);
outb(DMA1_FFC, 0);
/* send start address */
waport = DMA1_CHN(chan);
outb(waport, phys);
outb(waport, phys>>8);
outb(dmapageport[chan], phys>>16);
/* send count */
outb(waport + 1, --nbytes);
outb(waport + 1, nbytes>>8);
/* unmask channel */
outb(DMA1_SMSK, chan);
} else {
/*
* Program one of DMA channels 4..7. These are
* word mode channels.
*/
/* set dma channel mode, and reset address ff */
if (flags & B_READ)
outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3));
else
outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3));
outb(DMA2_FFC, 0);
/* send start address */
waport = DMA2_CHN(chan - 4);
outb(waport, phys>>1);
outb(waport, phys>>9);
outb(dmapageport[chan], phys>>16);
/* send count */
nbytes >>= 1;
outb(waport + 2, --nbytes);
outb(waport + 2, nbytes>>8);
/* unmask channel */
outb(DMA2_SMSK, chan & 3);
}
}
void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan)
{
/* copy bounce buffer on read */
/*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/
if (bounced[chan]) {
bcopy(dma_bounce[chan], addr, nbytes);
bounced[chan] = 0;
}
}
/*
* Check for problems with the address range of a DMA transfer
* (non-contiguous physical pages, outside of bus address space,
* crossing DMA page boundaries).
* Return true if special handling needed.
*/
static int
isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) {
vm_offset_t phys, priorpage = 0, endva;
u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1);
endva = (vm_offset_t)round_page(va + length);
for (; va < (caddr_t) endva ; va += NBPG) {
phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va));
#define ISARAM_END RAM_END
if (phys == 0)
panic("isa_dmacheck: no physical page present");
if (phys >= ISARAM_END)
return (1);
if (priorpage) {
if (priorpage + NBPG != phys)
return (1);
/* check if crossing a DMA page boundary */
if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk)
return (1);
}
priorpage = phys;
}
return (0);
}
/* head of queue waiting for physmem to become available */
struct buf isa_physmemq;
/* blocked waiting for resource to become free for exclusive use */
static isaphysmemflag;
/* if waited for and call requested when free (B_CALL) */
static void (*isaphysmemunblock)(); /* needs to be a list */
/*
* Allocate contiguous physical memory for transfer, returning
* a *virtual* address to region. May block waiting for resource.
* (assumed to be called at splbio())
*/
caddr_t
isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) {
isaphysmemunblock = func;
while (isaphysmemflag & B_BUSY) {
isaphysmemflag |= B_WANTED;
tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0);
}
isaphysmemflag |= B_BUSY;
return((caddr_t)isaphysmem);
}
/*
* Free contiguous physical memory used for transfer.
* (assumed to be called at splbio())
*/
void
isa_freephysmem(caddr_t va, unsigned length) {
isaphysmemflag &= ~B_BUSY;
if (isaphysmemflag & B_WANTED) {
isaphysmemflag &= B_WANTED;
wakeup((caddr_t)&isaphysmemflag);
if (isaphysmemunblock)
(*isaphysmemunblock)();
}
}
#define NMI_PARITY (1 << 7)
#define NMI_IOCHAN (1 << 6)
#define ENMI_WATCHDOG (1 << 7)
#define ENMI_BUSTIMER (1 << 6)
#define ENMI_IOSTATUS (1 << 5)
/*
* Handle a NMI, possibly a machine check.
* return true to panic system, false to ignore.
*/
int
isa_nmi(cd)
int cd;
{
int isa_port = inb(0x61);
int eisa_port = inb(0x461);
if(isa_port & NMI_PARITY) {
panic("RAM parity error, likely hardware failure.");
} else if(isa_port & NMI_IOCHAN) {
panic("I/O channel check, likely hardware failure.");
} else if(eisa_port & ENMI_WATCHDOG) {
panic("EISA watchdog timer expired, likely hardware failure.");
} else if(eisa_port & ENMI_BUSTIMER) {
panic("EISA bus timeout, likely hardware failure.");
} else if(eisa_port & ENMI_IOSTATUS) {
panic("EISA I/O port status error.");
} else {
printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port);
return(0);
}
}
/*
* Caught a stray interrupt, notify
*/
static void
isa_strayintr(d)
int d;
{
/* DON'T BOTHER FOR NOW! */
/* for some reason, we get bursts of intr #7, even if not enabled! */
/*
* Well the reason you got bursts of intr #7 is because someone
* raised an interrupt line and dropped it before the 8259 could
* prioritize it. This is documented in the intel data book. This
* means you have BAD hardware! I have changed this so that only
* the first 5 get logged, then it quits logging them, and puts
* out a special message. rgrimes 3/25/1993
*/
/*
* XXX TODO print a different message for #7 if it is for a
* glitch. Glitches can be distinguished from real #7's by
* testing that the in-service bit is _not_ set. The test
* must be done before sending an EOI so it can't be done if
* we are using AUTO_EOI_1.
*/
if (intrcnt[NR_DEVICES + d] <= 5)
log(LOG_ERR, "stray irq %d\n", d);
if (intrcnt[NR_DEVICES + d] == 5)
log(LOG_CRIT,
"too many stray irq %d's; not logging any more\n", d);
}
/*
* find an ISA device in a given isa_devtab_* table, given
* the table to search, the expected id_driver entry, and the unit number.
*
* this function is defined in isa_device.h, and this location is debatable;
* i put it there because it's useless w/o, and directly operates on
* the other stuff in that file.
*
*/
struct isa_device *find_isadev(table, driverp, unit)
struct isa_device *table;
struct isa_driver *driverp;
int unit;
{
if (driverp == NULL) /* sanity check */
return NULL;
while ((table->id_driver != driverp) || (table->id_unit != unit)) {
if (table->id_driver == 0)
return NULL;
table++;
}
return table;
}
/*
* Return nonzero if a (masked) irq is pending for a given device.
*/
int
isa_irq_pending(dvp)
struct isa_device *dvp;
{
unsigned id_irq;
id_irq = dvp->id_irq;
if (id_irq & 0xff)
return (inb(IO_ICU1) & id_irq);
return (inb(IO_ICU2) & (id_irq >> 8));
}
int
register_intr(intr, device_id, flags, handler, mask, unit)
int intr;
int device_id;
u_int flags;
inthand2_t *handler;
u_int mask;
int unit;
{
char *cp;
u_long ef;
int id;
if ((u_int)intr >= ICU_LEN || intr == 2
|| (u_int)device_id >= NR_DEVICES)
return (EINVAL);
if (intr_handler[intr] != isa_strayintr)
return (EBUSY);
ef = read_eflags();
disable_intr();
intr_countp[intr] = &intrcnt[device_id];
intr_handler[intr] = handler;
intr_mask[intr] = mask | (1 << intr);
intr_unit[intr] = unit;
setidt(ICU_OFFSET + intr,
flags & RI_FAST ? fastintr[intr] : slowintr[intr],
SDT_SYS386IGT, SEL_KPL);
write_eflags(ef);
for (cp = intrnames, id = 0; id <= device_id; id++)
while (*cp++ != '\0')
;
if (cp > eintrnames)
return (0);
if (intr < 10) {
cp[-3] = intr + '0';
cp[-2] = ' ';
} else {
cp[-3] = '1';
cp[-2] = intr - 10 + '0';
}
return (0);
}
static void
register_imask(dvp, mask)
struct isa_device *dvp;
u_int mask;
{
if (dvp->id_alive && dvp->id_irq) {
int intr;
intr = ffs(dvp->id_irq) - 1;
intr_mask[intr] = mask | (1 <<intr);
}
}
int
unregister_intr(intr, handler)
int intr;
inthand2_t *handler;
{
u_long ef;
if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr])
return (EINVAL);
ef = read_eflags();
disable_intr();
intr_countp[intr] = &intrcnt[NR_DEVICES + intr];
intr_handler[intr] = isa_strayintr;
intr_mask[intr] = HWI_MASK | SWI_MASK;
intr_unit[intr] = intr;
setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL);
write_eflags(ef);
return (0);
}
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