2 * Copyright (c) 1996, by Steve Passe
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. The name of the developer may NOT be used to endorse or promote products
11 * derived from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * $FreeBSD: src/sys/i386/i386/mpapic.c,v 1.37.2.7 2003/01/25 02:31:47 peter Exp $
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/kernel.h>
32 #include <sys/machintr.h>
33 #include <machine/globaldata.h>
34 #include <machine/smp.h>
35 #include <machine/md_var.h>
36 #include <machine/pmap.h>
37 #include <machine_base/apic/lapic.h>
38 #include <machine_base/apic/ioapic.h>
39 #include <machine_base/apic/ioapic_abi.h>
40 #include <machine/segments.h>
41 #include <sys/thread2.h>
43 #include <machine/intr_machdep.h>
47 #define IOAPIC_COUNT_MAX 16
48 #define IOAPIC_ID_MASK (IOAPIC_COUNT_MAX - 1)
57 TAILQ_ENTRY(ioapic_info) io_link;
59 TAILQ_HEAD(ioapic_info_list, ioapic_info);
61 struct ioapic_intsrc {
63 enum intr_trigger int_trig;
64 enum intr_polarity int_pola;
68 struct ioapic_info_list ioc_list;
69 struct ioapic_intsrc ioc_intsrc[16]; /* XXX magic number */
72 static void ioapic_setup(const struct ioapic_info *);
73 static int ioapic_alloc_apic_id(int);
74 static void ioapic_set_apic_id(const struct ioapic_info *);
75 static void ioapic_gsi_setup(int);
76 static const struct ioapic_info *
77 ioapic_gsi_search(int);
78 static void ioapic_pin_prog(void *, int, int,
79 enum intr_trigger, enum intr_polarity, uint32_t);
81 static struct ioapic_conf ioapic_conf;
83 static TAILQ_HEAD(, ioapic_enumerator) ioapic_enumerators =
84 TAILQ_HEAD_INITIALIZER(ioapic_enumerators);
89 struct ioapic_enumerator *e;
90 struct ioapic_info *info;
91 int start_apic_id = 0;
95 TAILQ_INIT(&ioapic_conf.ioc_list);
96 /* XXX magic number */
97 for (i = 0; i < 16; ++i)
98 ioapic_conf.ioc_intsrc[i].int_gsi = -1;
100 TAILQ_FOREACH(e, &ioapic_enumerators, ioapic_link) {
101 error = e->ioapic_probe(e);
107 panic("can't config I/O APIC\n");
109 kprintf("no I/O APIC\n");
120 * Switch to I/O APIC MachIntrABI and reconfigure
121 * the default IDT entries.
123 MachIntrABI = MachIntrABI_IOAPIC;
124 MachIntrABI.setdefault();
126 e->ioapic_enumerate(e);
132 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link)
135 if (i > IOAPIC_COUNT_MAX) /* XXX magic number */
136 panic("ioapic_config: more than 16 I/O APIC\n");
141 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) {
144 apic_id = ioapic_alloc_apic_id(start_apic_id);
145 if (apic_id == NAPICID) {
146 kprintf("IOAPIC: can't alloc APIC ID for "
147 "%dth I/O APIC\n", info->io_idx);
150 info->io_apic_id = apic_id;
152 start_apic_id = apic_id + 1;
156 * xAPIC allows I/O APIC's APIC ID to be same
157 * as the LAPIC's APIC ID
159 kprintf("IOAPIC: use xAPIC model to alloc APIC ID "
162 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link)
163 info->io_apic_id = info->io_idx;
167 * Warning about any GSI holes
169 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) {
170 const struct ioapic_info *prev_info;
172 prev_info = TAILQ_PREV(info, ioapic_info_list, io_link);
173 if (prev_info != NULL) {
174 if (info->io_gsi_base !=
175 prev_info->io_gsi_base + prev_info->io_npin) {
176 kprintf("IOAPIC: warning gsi hole "
178 prev_info->io_gsi_base +
180 info->io_gsi_base - 1);
186 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) {
187 kprintf("IOAPIC: idx %d, apic id %d, "
188 "gsi base %d, npin %d\n",
199 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link)
201 ioapic_abi_fixup_irqmap();
205 MachIntrABI.cleanup();
211 ioapic_enumerator_register(struct ioapic_enumerator *ne)
213 struct ioapic_enumerator *e;
215 TAILQ_FOREACH(e, &ioapic_enumerators, ioapic_link) {
216 if (e->ioapic_prio < ne->ioapic_prio) {
217 TAILQ_INSERT_BEFORE(e, ne, ioapic_link);
221 TAILQ_INSERT_TAIL(&ioapic_enumerators, ne, ioapic_link);
225 ioapic_add(void *addr, int gsi_base, int npin)
227 struct ioapic_info *info, *ninfo;
230 gsi_end = gsi_base + npin - 1;
231 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) {
232 if ((gsi_base >= info->io_gsi_base &&
233 gsi_base < info->io_gsi_base + info->io_npin) ||
234 (gsi_end >= info->io_gsi_base &&
235 gsi_end < info->io_gsi_base + info->io_npin)) {
236 panic("ioapic_add: overlapped gsi, base %d npin %d, "
237 "hit base %d, npin %d\n", gsi_base, npin,
238 info->io_gsi_base, info->io_npin);
240 if (info->io_addr == addr)
241 panic("ioapic_add: duplicated addr %p\n", addr);
244 ninfo = kmalloc(sizeof(*ninfo), M_DEVBUF, M_WAITOK | M_ZERO);
245 ninfo->io_addr = addr;
246 ninfo->io_npin = npin;
247 ninfo->io_gsi_base = gsi_base;
248 ninfo->io_apic_id = -1;
251 * Create IOAPIC list in ascending order of GSI base
253 TAILQ_FOREACH_REVERSE(info, &ioapic_conf.ioc_list,
254 ioapic_info_list, io_link) {
255 if (ninfo->io_gsi_base > info->io_gsi_base) {
256 TAILQ_INSERT_AFTER(&ioapic_conf.ioc_list,
257 info, ninfo, io_link);
262 TAILQ_INSERT_HEAD(&ioapic_conf.ioc_list, ninfo, io_link);
266 ioapic_intsrc(int irq, int gsi, enum intr_trigger trig, enum intr_polarity pola)
268 struct ioapic_intsrc *int_src;
271 int_src = &ioapic_conf.ioc_intsrc[irq];
274 /* Don't allow mixed mode */
275 kprintf("IOAPIC: warning intsrc irq %d -> gsi 0\n", irq);
279 if (int_src->int_gsi != -1) {
280 if (int_src->int_gsi != gsi) {
281 kprintf("IOAPIC: warning intsrc irq %d, gsi "
282 "%d -> %d\n", irq, int_src->int_gsi, gsi);
284 if (int_src->int_trig != trig) {
285 kprintf("IOAPIC: warning intsrc irq %d, trig "
287 intr_str_trigger(int_src->int_trig),
288 intr_str_trigger(trig));
290 if (int_src->int_pola != pola) {
291 kprintf("IOAPIC: warning intsrc irq %d, pola "
293 intr_str_polarity(int_src->int_pola),
294 intr_str_polarity(pola));
297 int_src->int_gsi = gsi;
298 int_src->int_trig = trig;
299 int_src->int_pola = pola;
303 ioapic_set_apic_id(const struct ioapic_info *info)
308 id = ioapic_read(info->io_addr, IOAPIC_ID);
311 id |= (info->io_apic_id << 24);
313 ioapic_write(info->io_addr, IOAPIC_ID, id);
318 id = ioapic_read(info->io_addr, IOAPIC_ID);
319 apic_id = (id & APIC_ID_MASK) >> 24;
322 * I/O APIC ID is a 4bits field
324 if ((apic_id & IOAPIC_ID_MASK) !=
325 (info->io_apic_id & IOAPIC_ID_MASK)) {
326 panic("ioapic_set_apic_id: can't set apic id to %d, "
327 "currently set to %d\n", info->io_apic_id, apic_id);
332 ioapic_gsi_setup(int gsi)
334 enum intr_trigger trig;
335 enum intr_polarity pola;
341 ioapic_extpin_setup(ioapic_gsi_ioaddr(gsi),
342 ioapic_gsi_pin(gsi), 0);
347 for (irq = 0; irq < 16; ++irq) {
348 const struct ioapic_intsrc *int_src =
349 &ioapic_conf.ioc_intsrc[irq];
351 if (gsi == int_src->int_gsi) {
352 trig = int_src->int_trig;
353 pola = int_src->int_pola;
360 trig = INTR_TRIGGER_EDGE;
361 pola = INTR_POLARITY_HIGH;
363 trig = INTR_TRIGGER_LEVEL;
364 pola = INTR_POLARITY_LOW;
369 ioapic_abi_set_irqmap(irq, gsi, trig, pola);
373 ioapic_gsi_ioaddr(int gsi)
375 const struct ioapic_info *info;
377 info = ioapic_gsi_search(gsi);
378 return info->io_addr;
382 ioapic_gsi_pin(int gsi)
384 const struct ioapic_info *info;
386 info = ioapic_gsi_search(gsi);
387 return gsi - info->io_gsi_base;
390 static const struct ioapic_info *
391 ioapic_gsi_search(int gsi)
393 const struct ioapic_info *info;
395 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) {
396 if (gsi >= info->io_gsi_base &&
397 gsi < info->io_gsi_base + info->io_npin)
400 panic("ioapic_gsi_search: no I/O APIC\n");
404 ioapic_gsi(int idx, int pin)
406 const struct ioapic_info *info;
408 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) {
409 if (info->io_idx == idx)
414 if (pin >= info->io_npin)
416 return info->io_gsi_base + pin;
420 ioapic_extpin_setup(void *addr, int pin, int vec)
422 ioapic_pin_prog(addr, pin, vec,
423 INTR_TRIGGER_CONFORM, INTR_POLARITY_CONFORM, IOART_DELEXINT);
427 ioapic_extpin_gsi(void)
433 ioapic_pin_setup(void *addr, int pin, int vec,
434 enum intr_trigger trig, enum intr_polarity pola)
437 * Always clear an I/O APIC pin before [re]programming it. This is
438 * particularly important if the pin is set up for a level interrupt
439 * as the IOART_REM_IRR bit might be set. When we reprogram the
440 * vector any EOI from pending ints on this pin could be lost and
441 * IRR might never get reset.
443 * To fix this problem, clear the vector and make sure it is
444 * programmed as an edge interrupt. This should theoretically
445 * clear IRR so we can later, safely program it as a level
448 ioapic_pin_prog(addr, pin, vec, INTR_TRIGGER_EDGE, INTR_POLARITY_HIGH,
450 ioapic_pin_prog(addr, pin, vec, trig, pola, IOART_DELFIXED);
454 ioapic_pin_prog(void *addr, int pin, int vec,
455 enum intr_trigger trig, enum intr_polarity pola, uint32_t del_mode)
457 uint32_t flags, target;
460 KKASSERT(del_mode == IOART_DELEXINT || del_mode == IOART_DELFIXED);
462 select = IOAPIC_REDTBL0 + (2 * pin);
464 flags = ioapic_read(addr, select) & IOART_RESV;
465 flags |= IOART_INTMSET | IOART_DESTPHY;
470 * We only support limited I/O APIC mixed mode,
471 * so even for ExtINT, we still use "fixed"
474 flags |= IOART_DELFIXED;
477 if (del_mode == IOART_DELEXINT) {
478 KKASSERT(trig == INTR_TRIGGER_CONFORM &&
479 pola == INTR_POLARITY_CONFORM);
480 flags |= IOART_TRGREDG | IOART_INTAHI;
483 case INTR_TRIGGER_EDGE:
484 flags |= IOART_TRGREDG;
487 case INTR_TRIGGER_LEVEL:
488 flags |= IOART_TRGRLVL;
491 case INTR_TRIGGER_CONFORM:
492 panic("ioapic_pin_prog: trig conform is not "
496 case INTR_POLARITY_HIGH:
497 flags |= IOART_INTAHI;
500 case INTR_POLARITY_LOW:
501 flags |= IOART_INTALO;
504 case INTR_POLARITY_CONFORM:
505 panic("ioapic_pin_prog: pola conform is not "
510 target = ioapic_read(addr, select + 1) & IOART_HI_DEST_RESV;
511 target |= (CPU_TO_ID(0) << IOART_HI_DEST_SHIFT) &
514 ioapic_write(addr, select, flags | vec);
515 ioapic_write(addr, select + 1, target);
519 ioapic_setup(const struct ioapic_info *info)
523 ioapic_set_apic_id(info);
525 for (i = 0; i < info->io_npin; ++i)
526 ioapic_gsi_setup(info->io_gsi_base + i);
530 ioapic_alloc_apic_id(int start)
533 const struct ioapic_info *info;
534 int apic_id, apic_id16;
536 apic_id = lapic_unused_apic_id(start);
537 if (apic_id == NAPICID) {
538 kprintf("IOAPIC: can't find unused APIC ID\n");
541 apic_id16 = apic_id & IOAPIC_ID_MASK;
544 * Check against other I/O APIC's APIC ID's lower 4bits.
546 * The new APIC ID will have to be different from others
547 * in the lower 4bits, no matter whether xAPIC is used
550 TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) {
551 if (info->io_apic_id == -1) {
555 if ((info->io_apic_id & IOAPIC_ID_MASK) == apic_id16)
561 kprintf("IOAPIC: APIC ID %d has same lower 4bits as "
562 "%dth I/O APIC, keep searching...\n",
563 apic_id, info->io_idx);
567 panic("ioapic_unused_apic_id: never reached\n");