2 * Copyright (c) 1991 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91
40 #include "opt_auto_eoi.h"
44 #include <sys/param.h>
46 #include <sys/errno.h>
47 #include <sys/interrupt.h>
48 #include <sys/kernel.h>
49 #include <sys/kthread.h>
51 #include <sys/malloc.h>
52 #include <sys/module.h>
53 #include <sys/mutex.h>
55 #include <sys/syslog.h>
56 #include <sys/systm.h>
57 #include <sys/unistd.h>
59 #include <machine/md_var.h>
60 #include <machine/segments.h>
63 #include <machine/smptests.h> /** FAST_HI */
64 #include <machine/smp.h>
65 #include <machine/resource.h>
68 #include <pc98/pc98/pc98.h>
69 #include <pc98/pc98/pc98_machdep.h>
70 #include <pc98/pc98/epsonio.h>
72 #include <i386/isa/isa.h>
74 #include <i386/isa/icu.h>
77 #include <isa/isavar.h>
79 #include <i386/isa/intr_machdep.h>
80 #include <sys/interrupt.h>
82 #include <machine/clock.h>
86 #include <i386/isa/mca_machdep.h>
92 u_long *intr_countp[ICU_LEN]; /* pointers to interrupt counters */
93 driver_intr_t *intr_handler[ICU_LEN]; /* first level interrupt handler */
94 struct ithd *ithds[ICU_LEN]; /* real interrupt handler */
95 void *intr_unit[ICU_LEN];
97 static struct mtx ithds_table_lock; /* protect the ithds table */
99 static inthand_t *fastintr[ICU_LEN] = {
100 &IDTVEC(fastintr0), &IDTVEC(fastintr1),
101 &IDTVEC(fastintr2), &IDTVEC(fastintr3),
102 &IDTVEC(fastintr4), &IDTVEC(fastintr5),
103 &IDTVEC(fastintr6), &IDTVEC(fastintr7),
104 &IDTVEC(fastintr8), &IDTVEC(fastintr9),
105 &IDTVEC(fastintr10), &IDTVEC(fastintr11),
106 &IDTVEC(fastintr12), &IDTVEC(fastintr13),
107 &IDTVEC(fastintr14), &IDTVEC(fastintr15),
109 &IDTVEC(fastintr16), &IDTVEC(fastintr17),
110 &IDTVEC(fastintr18), &IDTVEC(fastintr19),
111 &IDTVEC(fastintr20), &IDTVEC(fastintr21),
112 &IDTVEC(fastintr22), &IDTVEC(fastintr23),
113 &IDTVEC(fastintr24), &IDTVEC(fastintr25),
114 &IDTVEC(fastintr26), &IDTVEC(fastintr27),
115 &IDTVEC(fastintr28), &IDTVEC(fastintr29),
116 &IDTVEC(fastintr30), &IDTVEC(fastintr31),
120 static inthand_t *slowintr[ICU_LEN] = {
121 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3),
122 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7),
123 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11),
124 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15),
126 &IDTVEC(intr16), &IDTVEC(intr17), &IDTVEC(intr18), &IDTVEC(intr19),
127 &IDTVEC(intr20), &IDTVEC(intr21), &IDTVEC(intr22), &IDTVEC(intr23),
128 &IDTVEC(intr24), &IDTVEC(intr25), &IDTVEC(intr26), &IDTVEC(intr27),
129 &IDTVEC(intr28), &IDTVEC(intr29), &IDTVEC(intr30), &IDTVEC(intr31),
133 static driver_intr_t isa_strayintr;
135 static void ithds_init(void *dummy);
136 static void ithread_enable(int vector);
137 static void ithread_disable(int vector);
140 #define NMI_PARITY 0x04
141 #define NMI_EPARITY 0x02
143 #define NMI_PARITY (1 << 7)
144 #define NMI_IOCHAN (1 << 6)
145 #define ENMI_WATCHDOG (1 << 7)
146 #define ENMI_BUSTIMER (1 << 6)
147 #define ENMI_IOSTATUS (1 << 5)
151 * Bus attachment for the ISA PIC.
153 static struct isa_pnp_id atpic_ids[] = {
154 { 0x0000d041 /* PNP0000 */, "AT interrupt controller" },
159 atpic_probe(device_t dev)
163 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, atpic_ids)) <= 0)
169 * In the APIC_IO case we might be granted IRQ 2, as this is typically
170 * consumed by chaining between the two PIC components. If we're using
171 * the APIC, however, this may not be the case, and as such we should
172 * free the resource. (XXX untested)
174 * The generic ISA attachment code will handle allocating any other resources
175 * that we don't explicitly claim here.
178 atpic_attach(device_t dev)
182 struct resource *res;
184 /* try to allocate our IRQ and then free it */
186 res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1, 0);
188 bus_release_resource(dev, SYS_RES_IRQ, rid, res);
193 static device_method_t atpic_methods[] = {
194 /* Device interface */
195 DEVMETHOD(device_probe, atpic_probe),
196 DEVMETHOD(device_attach, atpic_attach),
197 DEVMETHOD(device_detach, bus_generic_detach),
198 DEVMETHOD(device_shutdown, bus_generic_shutdown),
199 DEVMETHOD(device_suspend, bus_generic_suspend),
200 DEVMETHOD(device_resume, bus_generic_resume),
204 static driver_t atpic_driver = {
210 static devclass_t atpic_devclass;
212 DRIVER_MODULE(atpic, isa, atpic_driver, atpic_devclass, 0, 0);
215 * Handle a NMI, possibly a machine check.
216 * return true to panic system, false to ignore.
224 int port = inb(0x33);
226 log(LOG_CRIT, "NMI PC98 port = %x\n", port);
227 if (epson_machine_id == 0x20)
228 epson_outb(0xc16, epson_inb(0xc16) | 0x1);
229 if (port & NMI_PARITY) {
230 log(LOG_CRIT, "BASE RAM parity error, likely hardware failure.");
232 } else if (port & NMI_EPARITY) {
233 log(LOG_CRIT, "EXTENDED RAM parity error, likely hardware failure.");
236 log(LOG_CRIT, "\nNMI Resume ??\n");
239 int isa_port = inb(0x61);
240 int eisa_port = inb(0x461);
242 log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
244 if (MCA_system && mca_bus_nmi())
248 if (isa_port & NMI_PARITY) {
249 log(LOG_CRIT, "RAM parity error, likely hardware failure.");
253 if (isa_port & NMI_IOCHAN) {
254 log(LOG_CRIT, "I/O channel check, likely hardware failure.");
259 * On a real EISA machine, this will never happen. However it can
260 * happen on ISA machines which implement XT style floating point
261 * error handling (very rare). Save them from a meaningless panic.
263 if (eisa_port == 0xff)
266 if (eisa_port & ENMI_WATCHDOG) {
267 log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
271 if (eisa_port & ENMI_BUSTIMER) {
272 log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
276 if (eisa_port & ENMI_IOSTATUS) {
277 log(LOG_CRIT, "EISA I/O port status error.");
285 * Create a default interrupt table to avoid problems caused by
286 * spurious interrupts during configuration of kernel, then setup
287 * interrupt control unit.
295 for (i = 0; i < ICU_LEN; i++)
296 icu_unset(i, (driver_intr_t *)NULL);
298 /* initialize 8259's */
301 outb(IO_ICU1, 0x19); /* reset; program device, four bytes */
304 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */
306 outb(IO_ICU1+ICU_IMR_OFFSET, NRSVIDT); /* starting at this vector index */
307 outb(IO_ICU1+ICU_IMR_OFFSET, IRQ_SLAVE); /* slave on line 7 */
310 outb(IO_ICU1+ICU_IMR_OFFSET, 0x1f); /* (master) auto EOI, 8086 mode */
312 outb(IO_ICU1+ICU_IMR_OFFSET, 0x1d); /* (master) 8086 mode */
316 outb(IO_ICU1+ICU_IMR_OFFSET, 2 | 1); /* auto EOI, 8086 mode */
318 outb(IO_ICU1+ICU_IMR_OFFSET, 1); /* 8086 mode */
321 outb(IO_ICU1+ICU_IMR_OFFSET, 0xff); /* leave interrupts masked */
322 outb(IO_ICU1, 0x0a); /* default to IRR on read */
324 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */
329 outb(IO_ICU2, 0x19); /* reset; program device, four bytes */
332 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */
334 outb(IO_ICU2+ICU_IMR_OFFSET, NRSVIDT+8); /* staring at this vector index */
335 outb(IO_ICU2+ICU_IMR_OFFSET, ICU_SLAVEID); /* my slave id is 7 */
337 outb(IO_ICU2+ICU_IMR_OFFSET,9); /* 8086 mode */
340 outb(IO_ICU2+ICU_IMR_OFFSET, 2 | 1); /* auto EOI, 8086 mode */
342 outb(IO_ICU2+ICU_IMR_OFFSET,1); /* 8086 mode */
345 outb(IO_ICU2+ICU_IMR_OFFSET, 0xff); /* leave interrupts masked */
346 outb(IO_ICU2, 0x0a); /* default to IRR on read */
350 * Caught a stray interrupt, notify
353 isa_strayintr(vcookiep)
356 int intr = (void **)vcookiep - &intr_unit[0];
359 * XXX TODO print a different message for #7 if it is for a
360 * glitch. Glitches can be distinguished from real #7's by
361 * testing that the in-service bit is _not_ set. The test
362 * must be done before sending an EOI so it can't be done if
363 * we are using AUTO_EOI_1.
365 if (intrcnt[1 + intr] <= 5)
366 log(LOG_ERR, "stray irq %d\n", intr);
367 if (intrcnt[1 + intr] == 5)
369 "too many stray irq %d's; not logging any more\n", intr);
374 * Return a bitmap of the current interrupt requests. This is 8259-specific
375 * and is only suitable for use at probe time.
385 return ((irr2 << 8) | irr1);
390 * Update intrnames array with the specified name. This is used by
391 * vmstat(8) and the like.
394 update_intrname(int intr, const char *name)
398 int name_index, off, strayintr;
401 * Initialise strings for bitbucket and stray interrupt counters.
402 * These have statically allocated indices 0 and 1 through ICU_LEN.
404 if (intrnames[0] == '\0') {
405 off = sprintf(intrnames, "???") + 1;
406 for (strayintr = 0; strayintr < ICU_LEN; strayintr++)
407 off += sprintf(intrnames + off, "stray irq%d",
413 if (snprintf(buf, sizeof(buf), "%s irq%d", name, intr) >= sizeof(buf))
417 * Search for `buf' in `intrnames'. In the usual case when it is
418 * not found, append it to the end if there is enough space (the \0
419 * terminator for the previous string, if any, becomes a separator).
421 for (cp = intrnames, name_index = 0;
422 cp != eintrnames && name_index < NR_INTRNAMES;
423 cp += strlen(cp) + 1, name_index++) {
425 if (strlen(buf) >= eintrnames - cp)
430 if (strcmp(cp, buf) == 0)
435 printf("update_intrname: counting %s irq%d as %s\n", name, intr,
439 intr_countp[intr] = &intrcnt[name_index];
443 icu_setup(int intr, driver_intr_t *handler, void *arg, int flags)
446 int select; /* the select register is 8 bits */
448 u_int32_t value; /* the window register is 32 bits */
453 if ((u_int)intr >= ICU_LEN) /* no 8259 SLAVE to ignore */
455 if ((u_int)intr >= ICU_LEN || intr == ICU_SLAVEID)
457 if (intr_handler[intr] != isa_strayintr)
462 intr_handler[intr] = handler;
463 intr_unit[intr] = arg;
465 if (flags & INTR_FAST) {
466 vector = TPR_FAST_INTS + intr;
467 setidt(vector, fastintr[intr],
468 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
471 vector = TPR_SLOW_INTS + intr;
472 #ifdef APIC_INTR_REORDER
473 #ifdef APIC_INTR_HIGHPRI_CLOCK
474 /* XXX: Hack (kludge?) for more accurate clock. */
475 if (intr == apic_8254_intr || intr == 8) {
476 vector = TPR_FAST_INTS + intr;
480 setidt(vector, slowintr[intr],
481 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
483 #ifdef APIC_INTR_REORDER
484 set_lapic_isrloc(intr, vector);
487 * Reprogram the vector in the IO APIC.
489 if (int_to_apicintpin[intr].ioapic >= 0) {
490 select = int_to_apicintpin[intr].redirindex;
491 value = io_apic_read(int_to_apicintpin[intr].ioapic,
492 select) & ~IOART_INTVEC;
493 io_apic_write(int_to_apicintpin[intr].ioapic,
494 select, value | vector);
497 setidt(ICU_OFFSET + intr,
498 flags & INTR_FAST ? fastintr[intr] : slowintr[intr],
499 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
507 * Dissociate an interrupt handler from an IRQ and set the handler to
508 * the stray interrupt handler. The 'handler' parameter is used only
509 * for consistency checking.
512 icu_unset(intr, handler)
514 driver_intr_t *handler;
518 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr])
524 intr_countp[intr] = &intrcnt[1 + intr];
525 intr_handler[intr] = isa_strayintr;
526 intr_unit[intr] = &intr_unit[intr];
528 /* XXX how do I re-create dvp here? */
529 setidt(flags & INTR_FAST ? TPR_FAST_INTS + intr : TPR_SLOW_INTS + intr,
530 slowintr[intr], SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
532 #ifdef APIC_INTR_REORDER
533 set_lapic_isrloc(intr, ICU_OFFSET + intr);
535 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL,
536 GSEL(GCODE_SEL, SEL_KPL));
543 ithds_init(void *dummy)
546 mtx_init(&ithds_table_lock, "ithread table lock", MTX_SPIN);
548 SYSINIT(ithds_init, SI_SUB_INTR, SI_ORDER_SECOND, ithds_init, NULL);
551 ithread_enable(int vector)
558 ithread_disable(int vector)
561 INTRDIS(1 << vector);
565 inthand_add(const char *name, int irq, driver_intr_t handler, void *arg,
566 enum intr_type flags, void **cookiep)
568 struct ithd *ithd; /* descriptor for the IRQ */
570 int created_ithd = 0;
573 * Work around a race where more than one CPU may be registering
574 * handlers on the same IRQ at the same time.
576 mtx_lock_spin(&ithds_table_lock);
578 mtx_unlock_spin(&ithds_table_lock);
580 errcode = ithread_create(&ithd, irq, 0, ithread_disable,
581 ithread_enable, "irq%d:", irq);
584 mtx_lock_spin(&ithds_table_lock);
585 if (ithds[irq] == NULL) {
588 mtx_unlock_spin(&ithds_table_lock);
594 mtx_unlock_spin(&ithds_table_lock);
595 ithread_destroy(orphan);
599 errcode = ithread_add_handler(ithd, name, handler, arg,
600 ithread_priority(flags), flags, cookiep);
602 if ((flags & INTR_FAST) == 0 || errcode)
604 * The interrupt process must be in place, but
605 * not necessarily schedulable, before we
606 * initialize the ICU, since it may cause an
607 * immediate interrupt.
609 if (icu_setup(irq, &sched_ithd, arg, flags) != 0)
610 panic("inthand_add: Can't initialize ICU");
615 if (flags & INTR_FAST) {
616 errcode = icu_setup(irq, handler, arg, flags);
617 if (errcode && bootverbose)
618 printf("\tinthand_add(irq%d) failed, result=%d\n",
624 update_intrname(irq, name);
629 * Deactivate and remove linked list the interrupt handler descriptor
630 * data connected created by an earlier call of inthand_add(), then
631 * adjust the interrupt masks if necessary.
633 * Return the memory held by the interrupt handler descriptor data
634 * structure to the system. First ensure the handler is not actively
638 inthand_remove(void *cookie)
641 return (ithread_remove_handler(cookie));