1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
|
/*-
* Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
* All rights reserved.
*
* 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. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
/*
* PIC driver for the 8259A Master and Slave PICs in PC/AT machines.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_auto_eoi.h"
#include "opt_isa.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <machine/cpufunc.h>
#include <machine/frame.h>
#include <machine/intr_machdep.h>
#include <machine/md_var.h>
#include <machine/resource.h>
#include <machine/segments.h>
#include <dev/ic/i8259.h>
#include <amd64/isa/icu.h>
#include <amd64/isa/isa.h>
#include <isa/isavar.h>
#define MASTER 0
#define SLAVE 1
/*
* PC-AT machines wire the slave PIC to pin 2 on the master PIC.
*/
#define ICU_SLAVEID 2
/*
* Determine the base master and slave modes not including auto EOI support.
* All machines that FreeBSD supports use 8086 mode.
*/
#define BASE_MASTER_MODE ICW4_8086
#define BASE_SLAVE_MODE ICW4_8086
/* Enable automatic EOI if requested. */
#ifdef AUTO_EOI_1
#define MASTER_MODE (BASE_MASTER_MODE | ICW4_AEOI)
#else
#define MASTER_MODE BASE_MASTER_MODE
#endif
#ifdef AUTO_EOI_2
#define SLAVE_MODE (BASE_SLAVE_MODE | ICW4_AEOI)
#else
#define SLAVE_MODE BASE_SLAVE_MODE
#endif
#define IRQ_MASK(irq) (1 << (irq))
#define IMEN_MASK(ai) (IRQ_MASK((ai)->at_irq))
#define NUM_ISA_IRQS 16
static void atpic_init(void *dummy);
unsigned int imen; /* XXX */
inthand_t
IDTVEC(atpic_intr0), IDTVEC(atpic_intr1), IDTVEC(atpic_intr2),
IDTVEC(atpic_intr3), IDTVEC(atpic_intr4), IDTVEC(atpic_intr5),
IDTVEC(atpic_intr6), IDTVEC(atpic_intr7), IDTVEC(atpic_intr8),
IDTVEC(atpic_intr9), IDTVEC(atpic_intr10), IDTVEC(atpic_intr11),
IDTVEC(atpic_intr12), IDTVEC(atpic_intr13), IDTVEC(atpic_intr14),
IDTVEC(atpic_intr15);
#define IRQ(ap, ai) ((ap)->at_irqbase + (ai)->at_irq)
#define ATPIC(io, base, eoi, imenptr) \
{ { atpic_enable_source, atpic_disable_source, (eoi), \
atpic_enable_intr, atpic_vector, atpic_source_pending, NULL, \
atpic_resume, atpic_config_intr, atpic_assign_cpu }, (io), \
(base), IDT_IO_INTS + (base), (imenptr) }
#define INTSRC(irq) \
{ { &atpics[(irq) / 8].at_pic }, IDTVEC(atpic_intr ## irq ), \
(irq) % 8 }
struct atpic {
struct pic at_pic;
int at_ioaddr;
int at_irqbase;
uint8_t at_intbase;
uint8_t *at_imen;
};
struct atpic_intsrc {
struct intsrc at_intsrc;
inthand_t *at_intr;
int at_irq; /* Relative to PIC base. */
enum intr_trigger at_trigger;
u_long at_count;
u_long at_straycount;
};
static void atpic_enable_source(struct intsrc *isrc);
static void atpic_disable_source(struct intsrc *isrc, int eoi);
static void atpic_eoi_master(struct intsrc *isrc);
static void atpic_eoi_slave(struct intsrc *isrc);
static void atpic_enable_intr(struct intsrc *isrc);
static int atpic_vector(struct intsrc *isrc);
static void atpic_resume(struct pic *pic);
static int atpic_source_pending(struct intsrc *isrc);
static int atpic_config_intr(struct intsrc *isrc, enum intr_trigger trig,
enum intr_polarity pol);
static void atpic_assign_cpu(struct intsrc *isrc, u_int apic_id);
static void i8259_init(struct atpic *pic, int slave);
static struct atpic atpics[] = {
ATPIC(IO_ICU1, 0, atpic_eoi_master, (uint8_t *)&imen),
ATPIC(IO_ICU2, 8, atpic_eoi_slave, ((uint8_t *)&imen) + 1)
};
static struct atpic_intsrc atintrs[] = {
INTSRC(0),
INTSRC(1),
INTSRC(2),
INTSRC(3),
INTSRC(4),
INTSRC(5),
INTSRC(6),
INTSRC(7),
INTSRC(8),
INTSRC(9),
INTSRC(10),
INTSRC(11),
INTSRC(12),
INTSRC(13),
INTSRC(14),
INTSRC(15),
};
CTASSERT(sizeof(atintrs) / sizeof(atintrs[0]) == NUM_ISA_IRQS);
static __inline void
_atpic_eoi_master(struct intsrc *isrc)
{
KASSERT(isrc->is_pic == &atpics[MASTER].at_pic,
("%s: mismatched pic", __func__));
#ifndef AUTO_EOI_1
outb(atpics[MASTER].at_ioaddr, OCW2_EOI);
#endif
}
/*
* The data sheet says no auto-EOI on slave, but it sometimes works.
* So, if AUTO_EOI_2 is enabled, we use it.
*/
static __inline void
_atpic_eoi_slave(struct intsrc *isrc)
{
KASSERT(isrc->is_pic == &atpics[SLAVE].at_pic,
("%s: mismatched pic", __func__));
#ifndef AUTO_EOI_2
outb(atpics[SLAVE].at_ioaddr, OCW2_EOI);
#ifndef AUTO_EOI_1
outb(atpics[MASTER].at_ioaddr, OCW2_EOI);
#endif
#endif
}
static void
atpic_enable_source(struct intsrc *isrc)
{
struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc;
struct atpic *ap = (struct atpic *)isrc->is_pic;
mtx_lock_spin(&icu_lock);
if (*ap->at_imen & IMEN_MASK(ai)) {
*ap->at_imen &= ~IMEN_MASK(ai);
outb(ap->at_ioaddr + ICU_IMR_OFFSET, *ap->at_imen);
}
mtx_unlock_spin(&icu_lock);
}
static void
atpic_disable_source(struct intsrc *isrc, int eoi)
{
struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc;
struct atpic *ap = (struct atpic *)isrc->is_pic;
mtx_lock_spin(&icu_lock);
if (ai->at_trigger != INTR_TRIGGER_EDGE) {
*ap->at_imen |= IMEN_MASK(ai);
outb(ap->at_ioaddr + ICU_IMR_OFFSET, *ap->at_imen);
}
/*
* Take care to call these functions directly instead of through
* a function pointer. All of the referenced variables should
* still be hot in the cache.
*/
if (eoi == PIC_EOI) {
if (isrc->is_pic == &atpics[MASTER].at_pic)
_atpic_eoi_master(isrc);
else
_atpic_eoi_slave(isrc);
}
mtx_unlock_spin(&icu_lock);
}
static void
atpic_eoi_master(struct intsrc *isrc)
{
#ifndef AUTO_EOI_1
mtx_lock_spin(&icu_lock);
_atpic_eoi_master(isrc);
mtx_unlock_spin(&icu_lock);
#endif
}
static void
atpic_eoi_slave(struct intsrc *isrc)
{
#ifndef AUTO_EOI_2
mtx_lock_spin(&icu_lock);
_atpic_eoi_slave(isrc);
mtx_unlock_spin(&icu_lock);
#endif
}
static void
atpic_enable_intr(struct intsrc *isrc)
{
}
static int
atpic_vector(struct intsrc *isrc)
{
struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc;
struct atpic *ap = (struct atpic *)isrc->is_pic;
return (IRQ(ap, ai));
}
static int
atpic_source_pending(struct intsrc *isrc)
{
struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc;
struct atpic *ap = (struct atpic *)isrc->is_pic;
return (inb(ap->at_ioaddr) & IMEN_MASK(ai));
}
static void
atpic_resume(struct pic *pic)
{
struct atpic *ap = (struct atpic *)pic;
i8259_init(ap, ap == &atpics[SLAVE]);
if (ap == &atpics[SLAVE] && elcr_found)
elcr_resume();
}
static int
atpic_config_intr(struct intsrc *isrc, enum intr_trigger trig,
enum intr_polarity pol)
{
struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc;
u_int vector;
/* Map conforming values to edge/hi and sanity check the values. */
if (trig == INTR_TRIGGER_CONFORM)
trig = INTR_TRIGGER_EDGE;
if (pol == INTR_POLARITY_CONFORM)
pol = INTR_POLARITY_HIGH;
vector = atpic_vector(isrc);
if ((trig == INTR_TRIGGER_EDGE && pol == INTR_POLARITY_LOW) ||
(trig == INTR_TRIGGER_LEVEL && pol == INTR_POLARITY_HIGH)) {
printf(
"atpic: Mismatched config for IRQ%u: trigger %s, polarity %s\n",
vector, trig == INTR_TRIGGER_EDGE ? "edge" : "level",
pol == INTR_POLARITY_HIGH ? "high" : "low");
return (EINVAL);
}
/* If there is no change, just return. */
if (ai->at_trigger == trig)
return (0);
/*
* Certain IRQs can never be level/lo, so don't try to set them
* that way if asked. At least some ELCR registers ignore setting
* these bits as well.
*/
if ((vector == 0 || vector == 1 || vector == 2 || vector == 13) &&
trig == INTR_TRIGGER_LEVEL) {
if (bootverbose)
printf(
"atpic: Ignoring invalid level/low configuration for IRQ%u\n",
vector);
return (EINVAL);
}
if (!elcr_found) {
if (bootverbose)
printf("atpic: No ELCR to configure IRQ%u as %s\n",
vector, trig == INTR_TRIGGER_EDGE ? "edge/high" :
"level/low");
return (ENXIO);
}
if (bootverbose)
printf("atpic: Programming IRQ%u as %s\n", vector,
trig == INTR_TRIGGER_EDGE ? "edge/high" : "level/low");
mtx_lock_spin(&icu_lock);
elcr_write_trigger(atpic_vector(isrc), trig);
ai->at_trigger = trig;
mtx_unlock_spin(&icu_lock);
return (0);
}
static void
atpic_assign_cpu(struct intsrc *isrc, u_int apic_id)
{
/*
* 8259A's are only used in UP in which case all interrupts always
* go to the sole CPU and this function shouldn't even be called.
*/
panic("%s: bad cookie", __func__);
}
static void
i8259_init(struct atpic *pic, int slave)
{
int imr_addr;
/* Reset the PIC and program with next four bytes. */
mtx_lock_spin(&icu_lock);
outb(pic->at_ioaddr, ICW1_RESET | ICW1_IC4);
imr_addr = pic->at_ioaddr + ICU_IMR_OFFSET;
/* Start vector. */
outb(imr_addr, pic->at_intbase);
/*
* Setup slave links. For the master pic, indicate what line
* the slave is configured on. For the slave indicate
* which line on the master we are connected to.
*/
if (slave)
outb(imr_addr, ICU_SLAVEID);
else
outb(imr_addr, IRQ_MASK(ICU_SLAVEID));
/* Set mode. */
if (slave)
outb(imr_addr, SLAVE_MODE);
else
outb(imr_addr, MASTER_MODE);
/* Set interrupt enable mask. */
outb(imr_addr, *pic->at_imen);
/* Reset is finished, default to IRR on read. */
outb(pic->at_ioaddr, OCW3_SEL | OCW3_RR);
/* OCW2_L1 sets priority order to 3-7, 0-2 (com2 first). */
if (!slave)
outb(pic->at_ioaddr, OCW2_R | OCW2_SL | OCW2_L1);
mtx_unlock_spin(&icu_lock);
}
void
atpic_startup(void)
{
struct atpic_intsrc *ai;
int i;
/* Start off with all interrupts disabled. */
imen = 0xffff;
i8259_init(&atpics[MASTER], 0);
i8259_init(&atpics[SLAVE], 1);
atpic_enable_source((struct intsrc *)&atintrs[ICU_SLAVEID]);
/* Install low-level interrupt handlers for all of our IRQs. */
for (i = 0, ai = atintrs; i < NUM_ISA_IRQS; i++, ai++) {
if (i == ICU_SLAVEID)
continue;
ai->at_intsrc.is_count = &ai->at_count;
ai->at_intsrc.is_straycount = &ai->at_straycount;
setidt(((struct atpic *)ai->at_intsrc.is_pic)->at_intbase +
ai->at_irq, ai->at_intr, SDT_SYSIGT, SEL_KPL, 0);
}
/*
* Look for an ELCR. If we find one, update the trigger modes.
* If we don't find one, assume that IRQs 0, 1, 2, and 13 are
* edge triggered and that everything else is level triggered.
* We only use the trigger information to reprogram the ELCR if
* we have one and as an optimization to avoid masking edge
* triggered interrupts. For the case that we don't have an ELCR,
* it doesn't hurt to mask an edge triggered interrupt, so we
* assume level trigger for any interrupt that we aren't sure is
* edge triggered.
*/
if (elcr_found) {
for (i = 0, ai = atintrs; i < NUM_ISA_IRQS; i++, ai++)
ai->at_trigger = elcr_read_trigger(i);
} else {
for (i = 0, ai = atintrs; i < NUM_ISA_IRQS; i++, ai++)
switch (i) {
case 0:
case 1:
case 2:
case 8:
case 13:
ai->at_trigger = INTR_TRIGGER_EDGE;
break;
default:
ai->at_trigger = INTR_TRIGGER_LEVEL;
break;
}
}
}
static void
atpic_init(void *dummy __unused)
{
struct atpic_intsrc *ai;
int i;
/*
* Register our PICs, even if we aren't going to use any of their
* pins so that they are suspended and resumed.
*/
if (intr_register_pic(&atpics[0].at_pic) != 0 ||
intr_register_pic(&atpics[1].at_pic) != 0)
panic("Unable to register ATPICs");
/*
* If any of the ISA IRQs have an interrupt source already, then
* assume that the APICs are being used and don't register any
* of our interrupt sources. This makes sure we don't accidentally
* use mixed mode. The "accidental" use could otherwise occur on
* machines that route the ACPI SCI interrupt to a different ISA
* IRQ (at least one machines routes it to IRQ 13) thus disabling
* that APIC ISA routing and allowing the ATPIC source for that IRQ
* to leak through. We used to depend on this feature for routing
* IRQ0 via mixed mode, but now we don't use mixed mode at all.
*/
for (i = 0; i < NUM_ISA_IRQS; i++)
if (intr_lookup_source(i) != NULL)
return;
/* Loop through all interrupt sources and add them. */
for (i = 0, ai = atintrs; i < NUM_ISA_IRQS; i++, ai++) {
if (i == ICU_SLAVEID)
continue;
intr_register_source(&ai->at_intsrc);
}
}
SYSINIT(atpic_init, SI_SUB_INTR, SI_ORDER_SECOND + 1, atpic_init, NULL)
void
atpic_handle_intr(u_int vector, struct trapframe frame)
{
struct intsrc *isrc;
KASSERT(vector < NUM_ISA_IRQS, ("unknown int %u\n", vector));
isrc = &atintrs[vector].at_intsrc;
/*
* If we don't have an event, see if this is a spurious
* interrupt.
*/
if (isrc->is_event == NULL && (vector == 7 || vector == 15)) {
int port, isr;
/*
* Read the ISR register to see if IRQ 7/15 is really
* pending. Reset read register back to IRR when done.
*/
port = ((struct atpic *)isrc->is_pic)->at_ioaddr;
mtx_lock_spin(&icu_lock);
outb(port, OCW3_SEL | OCW3_RR | OCW3_RIS);
isr = inb(port);
outb(port, OCW3_SEL | OCW3_RR);
mtx_unlock_spin(&icu_lock);
if ((isr & IRQ_MASK(7)) == 0)
return;
}
intr_execute_handlers(isrc, &frame);
}
#ifdef DEV_ISA
/*
* Bus attachment for the ISA PIC.
*/
static struct isa_pnp_id atpic_ids[] = {
{ 0x0000d041 /* PNP0000 */, "AT interrupt controller" },
{ 0 }
};
static int
atpic_probe(device_t dev)
{
int result;
result = ISA_PNP_PROBE(device_get_parent(dev), dev, atpic_ids);
if (result <= 0)
device_quiet(dev);
return (result);
}
/*
* We might be granted IRQ 2, as this is typically consumed by chaining
* between the two PIC components. If we're using the APIC, however,
* this may not be the case, and as such we should free the resource.
* (XXX untested)
*
* The generic ISA attachment code will handle allocating any other resources
* that we don't explicitly claim here.
*/
static int
atpic_attach(device_t dev)
{
struct resource *res;
int rid;
/* Try to allocate our IRQ and then free it. */
rid = 0;
res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 0);
if (res != NULL)
bus_release_resource(dev, SYS_RES_IRQ, rid, res);
return (0);
}
static device_method_t atpic_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, atpic_probe),
DEVMETHOD(device_attach, atpic_attach),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
{ 0, 0 }
};
static driver_t atpic_driver = {
"atpic",
atpic_methods,
1, /* no softc */
};
static devclass_t atpic_devclass;
DRIVER_MODULE(atpic, isa, atpic_driver, atpic_devclass, 0, 0);
DRIVER_MODULE(atpic, acpi, atpic_driver, atpic_devclass, 0, 0);
/*
* Return a bitmap of the current interrupt requests. This is 8259-specific
* and is only suitable for use at probe time.
*/
intrmask_t
isa_irq_pending(void)
{
u_char irr1;
u_char irr2;
irr1 = inb(IO_ICU1);
irr2 = inb(IO_ICU2);
return ((irr2 << 8) | irr1);
}
#endif /* DEV_ISA */
|