FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/mpapic.c
1 /*
2 * Copyright (c) 1996, by Steve Passe
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
12 *
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
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD: releng/5.1/sys/i386/i386/mpapic.c 109713 2003-01-23 01:00:58Z peter $
26 */
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/bus.h>
31 #include <sys/lock.h>
32 #include <sys/mutex.h>
33 #include <sys/proc.h>
34
35 #include <machine/cpufunc.h>
36 #include <machine/smptests.h> /** TEST_TEST1 */
37 #include <machine/smp.h>
38 #include <machine/mpapic.h>
39 #include <machine/segments.h>
40
41 #include <i386/isa/intr_machdep.h> /* Xspuriousint() */
42 #include <i386/isa/icu.h> /* apic_imen */
43
44 /* EISA Edge/Level trigger control registers */
45 #define ELCR0 0x4d0 /* eisa irq 0-7 */
46 #define ELCR1 0x4d1 /* eisa irq 8-15 */
47
48 /*
49 * pointers to pmapped apic hardware.
50 */
51
52 #if defined(APIC_IO)
53 volatile ioapic_t **ioapic;
54 #endif /* APIC_IO */
55
56 /*
57 * Enable APIC, configure interrupts.
58 */
59 void
60 apic_initialize(void)
61 {
62 u_int temp;
63
64 /* setup LVT1 as ExtINT */
65 temp = lapic.lvt_lint0;
66 temp &= ~(APIC_LVT_M | APIC_LVT_TM | APIC_LVT_IIPP | APIC_LVT_DM);
67 if (PCPU_GET(cpuid) == 0)
68 temp |= 0x00000700; /* process ExtInts */
69 else
70 temp |= 0x00010700; /* mask ExtInts */
71 lapic.lvt_lint0 = temp;
72
73 /* setup LVT2 as NMI, masked till later... */
74 temp = lapic.lvt_lint1;
75 temp &= ~(APIC_LVT_M | APIC_LVT_TM | APIC_LVT_IIPP | APIC_LVT_DM);
76 temp |= 0x00010400; /* masked, edge trigger, active hi */
77
78 lapic.lvt_lint1 = temp;
79
80 /* set the Task Priority Register as needed */
81 temp = lapic.tpr;
82 temp &= ~APIC_TPR_PRIO; /* clear priority field */
83 lapic.tpr = temp;
84
85 /* enable the local APIC */
86 temp = lapic.svr;
87 temp |= APIC_SVR_SWEN; /* software enable APIC */
88 temp &= ~APIC_SVR_FOCUS; /* enable 'focus processor' */
89
90 /* set the 'spurious INT' vector */
91 if ((XSPURIOUSINT_OFFSET & APIC_SVR_VEC_FIX) != APIC_SVR_VEC_FIX)
92 panic("bad XSPURIOUSINT_OFFSET: 0x%08x", XSPURIOUSINT_OFFSET);
93 temp &= ~APIC_SVR_VEC_PROG; /* clear (programmable) vector field */
94 temp |= (XSPURIOUSINT_OFFSET & APIC_SVR_VEC_PROG);
95
96 #if defined(TEST_TEST1)
97 if (PCPU_GET(cpuid) == GUARD_CPU) {
98 temp &= ~APIC_SVR_SWEN; /* software DISABLE APIC */
99 }
100 #endif /** TEST_TEST1 */
101
102 lapic.svr = temp;
103 }
104
105
106 /*
107 * dump contents of local APIC registers
108 */
109 void
110 apic_dump(char* str)
111 {
112 printf("SMP: CPU%d %s:\n", PCPU_GET(cpuid), str);
113 printf(" lint0: 0x%08x lint1: 0x%08x TPR: 0x%08x SVR: 0x%08x\n",
114 lapic.lvt_lint0, lapic.lvt_lint1, lapic.tpr, lapic.svr);
115 }
116
117
118 #if defined(APIC_IO)
119
120 /*
121 * IO APIC code,
122 */
123
124 #define IOAPIC_ISA_INTS 16
125 #define REDIRCNT_IOAPIC(A) \
126 ((int)((io_apic_versions[(A)] & IOART_VER_MAXREDIR) >> MAXREDIRSHIFT) + 1)
127
128 static int trigger(int apic, int pin, u_int32_t * flags);
129 static void polarity(int apic, int pin, u_int32_t * flags, int level);
130
131 #define DEFAULT_FLAGS \
132 ((u_int32_t) \
133 (IOART_INTMSET | \
134 IOART_DESTPHY | \
135 IOART_DELLOPRI))
136
137 #define DEFAULT_ISA_FLAGS \
138 ((u_int32_t) \
139 (IOART_INTMSET | \
140 IOART_TRGREDG | \
141 IOART_INTAHI | \
142 IOART_DESTPHY | \
143 IOART_DELLOPRI))
144
145 void
146 io_apic_set_id(int apic, int id)
147 {
148 u_int32_t ux;
149
150 ux = io_apic_read(apic, IOAPIC_ID); /* get current contents */
151 if (((ux & APIC_ID_MASK) >> 24) != id) {
152 printf("Changing APIC ID for IO APIC #%d"
153 " from %d to %d on chip\n",
154 apic, ((ux & APIC_ID_MASK) >> 24), id);
155 ux &= ~APIC_ID_MASK; /* clear the ID field */
156 ux |= (id << 24);
157 io_apic_write(apic, IOAPIC_ID, ux); /* write new value */
158 ux = io_apic_read(apic, IOAPIC_ID); /* re-read && test */
159 if (((ux & APIC_ID_MASK) >> 24) != id)
160 panic("can't control IO APIC #%d ID, reg: 0x%08x",
161 apic, ux);
162 }
163 }
164
165
166 int
167 io_apic_get_id(int apic)
168 {
169 return (io_apic_read(apic, IOAPIC_ID) & APIC_ID_MASK) >> 24;
170 }
171
172
173
174 /*
175 * Setup the IO APIC.
176 */
177
178 extern int apic_pin_trigger; /* 'opaque' */
179
180 void
181 io_apic_setup_intpin(int apic, int pin)
182 {
183 int bus, bustype, irq;
184 u_char select; /* the select register is 8 bits */
185 u_int32_t flags; /* the window register is 32 bits */
186 u_int32_t target; /* the window register is 32 bits */
187 u_int32_t vector; /* the window register is 32 bits */
188 int level;
189 register_t crit;
190
191 target = IOART_DEST;
192
193 select = pin * 2 + IOAPIC_REDTBL0; /* register */
194 /*
195 * Always disable interrupts, and by default map
196 * pin X to IRQX because the disable doesn't stick
197 * and the uninitialize vector will get translated
198 * into a panic.
199 *
200 * This is correct for IRQs 1 and 3-15. In the other cases,
201 * any robust driver will handle the spurious interrupt, and
202 * the effective NOP beats a panic.
203 *
204 * A dedicated "bogus interrupt" entry in the IDT would
205 * be a nicer hack, although some one should find out
206 * why some systems are generating interrupts when they
207 * shouldn't and stop the carnage.
208 */
209 vector = NRSVIDT + pin; /* IDT vec */
210 crit = intr_disable();
211 mtx_lock_spin(&icu_lock);
212 io_apic_write(apic, select,
213 (io_apic_read(apic, select) & ~IOART_INTMASK
214 & ~0xff)|IOART_INTMSET|vector);
215 mtx_unlock_spin(&icu_lock);
216 intr_restore(crit);
217
218 /* we only deal with vectored INTs here */
219 if (apic_int_type(apic, pin) != 0)
220 return;
221
222 irq = apic_irq(apic, pin);
223 if (irq < 0)
224 return;
225
226 /* determine the bus type for this pin */
227 bus = apic_src_bus_id(apic, pin);
228 if (bus == -1)
229 return;
230 bustype = apic_bus_type(bus);
231
232 if ((bustype == ISA) &&
233 (pin < IOAPIC_ISA_INTS) &&
234 (irq == pin) &&
235 (apic_polarity(apic, pin) == 0x1) &&
236 (apic_trigger(apic, pin) == 0x3)) {
237 /*
238 * A broken BIOS might describe some ISA
239 * interrupts as active-high level-triggered.
240 * Use default ISA flags for those interrupts.
241 */
242 flags = DEFAULT_ISA_FLAGS;
243 } else {
244 /*
245 * Program polarity and trigger mode according to
246 * interrupt entry.
247 */
248 flags = DEFAULT_FLAGS;
249 level = trigger(apic, pin, &flags);
250 if (level == 1)
251 apic_pin_trigger |= (1 << irq);
252 polarity(apic, pin, &flags, level);
253 }
254
255 /* program the appropriate registers */
256 if (apic != 0 || pin != irq)
257 printf("IOAPIC #%d intpin %d -> irq %d\n",
258 apic, pin, irq);
259 vector = NRSVIDT + irq; /* IDT vec */
260 crit = intr_disable();
261 mtx_lock_spin(&icu_lock);
262 io_apic_write(apic, select, flags | vector);
263 io_apic_write(apic, select + 1, target);
264 mtx_unlock_spin(&icu_lock);
265 intr_restore(crit);
266 }
267
268 int
269 io_apic_setup(int apic)
270 {
271 int maxpin;
272 int pin;
273
274 if (apic == 0)
275 apic_pin_trigger = 0; /* default to edge-triggered */
276
277 maxpin = REDIRCNT_IOAPIC(apic); /* pins in APIC */
278 printf("Programming %d pins in IOAPIC #%d\n", maxpin, apic);
279
280 for (pin = 0; pin < maxpin; ++pin) {
281 io_apic_setup_intpin(apic, pin);
282 }
283
284 /* return GOOD status */
285 return 0;
286 }
287 #undef DEFAULT_ISA_FLAGS
288 #undef DEFAULT_FLAGS
289
290
291 #define DEFAULT_EXTINT_FLAGS \
292 ((u_int32_t) \
293 (IOART_INTMSET | \
294 IOART_TRGREDG | \
295 IOART_INTAHI | \
296 IOART_DESTPHY | \
297 IOART_DELLOPRI))
298
299 /*
300 * Setup the source of External INTerrupts.
301 */
302 int
303 ext_int_setup(int apic, int intr)
304 {
305 u_char select; /* the select register is 8 bits */
306 u_int32_t flags; /* the window register is 32 bits */
307 u_int32_t target; /* the window register is 32 bits */
308 u_int32_t vector; /* the window register is 32 bits */
309
310 if (apic_int_type(apic, intr) != 3)
311 return -1;
312
313 target = IOART_DEST;
314 select = IOAPIC_REDTBL0 + (2 * intr);
315 vector = NRSVIDT + intr;
316 flags = DEFAULT_EXTINT_FLAGS;
317
318 io_apic_write(apic, select, flags | vector);
319 io_apic_write(apic, select + 1, target);
320
321 return 0;
322 }
323 #undef DEFAULT_EXTINT_FLAGS
324
325
326 /*
327 * Set the trigger level for an IO APIC pin.
328 */
329 static int
330 trigger(int apic, int pin, u_int32_t * flags)
331 {
332 int id;
333 int eirq;
334 int level;
335 static int intcontrol = -1;
336
337 switch (apic_trigger(apic, pin)) {
338
339 case 0x00:
340 break;
341
342 case 0x01:
343 *flags &= ~IOART_TRGRLVL; /* *flags |= IOART_TRGREDG */
344 return 0;
345
346 case 0x03:
347 *flags |= IOART_TRGRLVL;
348 return 1;
349
350 case -1:
351 default:
352 goto bad;
353 }
354
355 if ((id = apic_src_bus_id(apic, pin)) == -1)
356 goto bad;
357
358 switch (apic_bus_type(id)) {
359 case ISA:
360 *flags &= ~IOART_TRGRLVL; /* *flags |= IOART_TRGREDG; */
361 return 0;
362
363 case EISA:
364 eirq = apic_src_bus_irq(apic, pin);
365
366 if (eirq < 0 || eirq > 15) {
367 printf("EISA IRQ %d?!?!\n", eirq);
368 goto bad;
369 }
370
371 if (intcontrol == -1) {
372 intcontrol = inb(ELCR1) << 8;
373 intcontrol |= inb(ELCR0);
374 printf("EISA INTCONTROL = %08x\n", intcontrol);
375 }
376
377 /* Use ELCR settings to determine level or edge mode */
378 level = (intcontrol >> eirq) & 1;
379
380 /*
381 * Note that on older Neptune chipset based systems, any
382 * pci interrupts often show up here and in the ELCR as well
383 * as level sensitive interrupts attributed to the EISA bus.
384 */
385
386 if (level)
387 *flags |= IOART_TRGRLVL;
388 else
389 *flags &= ~IOART_TRGRLVL;
390
391 return level;
392
393 case PCI:
394 *flags |= IOART_TRGRLVL;
395 return 1;
396
397 case -1:
398 default:
399 goto bad;
400 }
401
402 bad:
403 panic("bad APIC IO INT flags");
404 }
405
406
407 /*
408 * Set the polarity value for an IO APIC pin.
409 */
410 static void
411 polarity(int apic, int pin, u_int32_t * flags, int level)
412 {
413 int id;
414
415 switch (apic_polarity(apic, pin)) {
416
417 case 0x00:
418 break;
419
420 case 0x01:
421 *flags &= ~IOART_INTALO; /* *flags |= IOART_INTAHI */
422 return;
423
424 case 0x03:
425 *flags |= IOART_INTALO;
426 return;
427
428 case -1:
429 default:
430 goto bad;
431 }
432
433 if ((id = apic_src_bus_id(apic, pin)) == -1)
434 goto bad;
435
436 switch (apic_bus_type(id)) {
437 case ISA:
438 *flags &= ~IOART_INTALO; /* *flags |= IOART_INTAHI */
439 return;
440
441 case EISA:
442 /* polarity converter always gives active high */
443 *flags &= ~IOART_INTALO;
444 return;
445
446 case PCI:
447 *flags |= IOART_INTALO;
448 return;
449
450 case -1:
451 default:
452 goto bad;
453 }
454
455 bad:
456 panic("bad APIC IO INT flags");
457 }
458
459
460 /*
461 * Print contents of apic_imen.
462 */
463 void
464 imen_dump(void)
465 {
466 int x;
467
468 printf("SMP: enabled INTs: ");
469 for (x = 0; x < NHWI; ++x)
470 if ((apic_imen & (1 << x)) == 0)
471 printf("%d, ", x);
472 printf("apic_imen: 0x%08x\n", apic_imen);
473 }
474
475
476 /*
477 * Inter Processor Interrupt functions.
478 */
479
480
481 /*
482 * Send APIC IPI 'vector' to 'destType' via 'deliveryMode'.
483 *
484 * destType is 1 of: APIC_DEST_SELF, APIC_DEST_ALLISELF, APIC_DEST_ALLESELF
485 * vector is any valid SYSTEM INT vector
486 * delivery_mode is 1 of: APIC_DELMODE_FIXED, APIC_DELMODE_LOWPRIO
487 */
488 #define DETECT_DEADLOCK
489 int
490 apic_ipi(int dest_type, int vector, int delivery_mode)
491 {
492 u_long icr_lo;
493
494 #if defined(DETECT_DEADLOCK)
495 #define MAX_SPIN1 10000000
496 #define MAX_SPIN2 1000
497 int x;
498
499 /* "lazy delivery", ie we only barf if they stack up on us... */
500 for (x = MAX_SPIN1; x; --x) {
501 if ((lapic.icr_lo & APIC_DELSTAT_MASK) == 0)
502 break;
503 }
504 if (x == 0)
505 panic("apic_ipi was stuck");
506 #endif /* DETECT_DEADLOCK */
507
508 /* build IRC_LOW */
509 icr_lo = (lapic.icr_lo & APIC_RESV2_MASK)
510 | dest_type | delivery_mode | vector;
511
512 /* write APIC ICR */
513 lapic.icr_lo = icr_lo;
514
515 /* wait for pending status end */
516 #if defined(DETECT_DEADLOCK)
517 for (x = MAX_SPIN2; x; --x) {
518 if ((lapic.icr_lo & APIC_DELSTAT_MASK) == 0)
519 break;
520 }
521 #ifdef needsattention
522 /*
523 * XXX FIXME:
524 * The above loop waits for the message to actually be delivered.
525 * It breaks out after an arbitrary timout on the theory that it eventually
526 * will be delivered and we will catch a real failure on the next entry to
527 * this function, which would panic().
528 * We could skip this wait entirely, EXCEPT it probably protects us from
529 * other "less robust" routines that assume the message was delivered and
530 * acted upon when this function returns. TLB shootdowns are one such
531 * "less robust" function.
532 */
533 if (x == 0)
534 printf("apic_ipi might be stuck\n");
535 #endif
536 #undef MAX_SPIN2
537 #undef MAX_SPIN1
538 #else
539 while (lapic.icr_lo & APIC_DELSTAT_MASK)
540 /* spin */ ;
541 #endif /* DETECT_DEADLOCK */
542
543 /** XXX FIXME: return result */
544 return 0;
545 }
546
547 static int
548 apic_ipi_singledest(int cpu, int vector, int delivery_mode)
549 {
550 u_long icr_lo;
551 u_long icr_hi;
552 u_long eflags;
553
554 #if defined(DETECT_DEADLOCK)
555 #define MAX_SPIN1 10000000
556 #define MAX_SPIN2 1000
557 int x;
558
559 /* "lazy delivery", ie we only barf if they stack up on us... */
560 for (x = MAX_SPIN1; x; --x) {
561 if ((lapic.icr_lo & APIC_DELSTAT_MASK) == 0)
562 break;
563 }
564 if (x == 0)
565 panic("apic_ipi was stuck");
566 #endif /* DETECT_DEADLOCK */
567
568 eflags = read_eflags();
569 disable_intr();
570 icr_hi = lapic.icr_hi & ~APIC_ID_MASK;
571 icr_hi |= (CPU_TO_ID(cpu) << 24);
572 lapic.icr_hi = icr_hi;
573
574 /* build IRC_LOW */
575 icr_lo = (lapic.icr_lo & APIC_RESV2_MASK)
576 | APIC_DEST_DESTFLD | delivery_mode | vector;
577
578 /* write APIC ICR */
579 lapic.icr_lo = icr_lo;
580 write_eflags(eflags);
581
582 /* wait for pending status end */
583 #if defined(DETECT_DEADLOCK)
584 for (x = MAX_SPIN2; x; --x) {
585 if ((lapic.icr_lo & APIC_DELSTAT_MASK) == 0)
586 break;
587 }
588 #ifdef needsattention
589 /*
590 * XXX FIXME:
591 * The above loop waits for the message to actually be delivered.
592 * It breaks out after an arbitrary timout on the theory that it eventually
593 * will be delivered and we will catch a real failure on the next entry to
594 * this function, which would panic().
595 * We could skip this wait entirely, EXCEPT it probably protects us from
596 * other "less robust" routines that assume the message was delivered and
597 * acted upon when this function returns. TLB shootdowns are one such
598 * "less robust" function.
599 */
600 if (x == 0)
601 printf("apic_ipi might be stuck\n");
602 #endif
603 #undef MAX_SPIN2
604 #undef MAX_SPIN1
605 #else
606 while (lapic.icr_lo & APIC_DELSTAT_MASK)
607 /* spin */ ;
608 #endif /* DETECT_DEADLOCK */
609
610 /** XXX FIXME: return result */
611 return 0;
612 }
613
614
615 /*
616 * Send APIC IPI 'vector' to 'target's via 'delivery_mode'.
617 *
618 * target contains a bitfield with a bit set for selected APICs.
619 * vector is any valid SYSTEM INT vector
620 * delivery_mode is 1 of: APIC_DELMODE_FIXED, APIC_DELMODE_LOWPRIO
621 */
622 int
623 selected_apic_ipi(u_int target, int vector, int delivery_mode)
624 {
625 int x;
626 int status;
627
628 if (target & ~0x7fff)
629 return -1; /* only 15 targets allowed */
630
631 for (status = 0, x = 0; x <= 14; ++x)
632 if (target & (1 << x)) {
633
634 /* send the IPI */
635 if (apic_ipi_singledest(x, vector,
636 delivery_mode) == -1)
637 status |= (1 << x);
638 }
639 return status;
640 }
641
642 #endif /* APIC_IO */
643
644
645 /*
646 * Timer code, in development...
647 * - suggested by rgrimes@gndrsh.aac.dev.com
648 */
649
650 /** XXX FIXME: temp hack till we can determin bus clock */
651 #ifndef BUS_CLOCK
652 #define BUS_CLOCK 66000000
653 #define bus_clock() 66000000
654 #endif
655
656 #if defined(READY)
657 int acquire_apic_timer(void);
658 int release_apic_timer(void);
659
660 /*
661 * Acquire the APIC timer for exclusive use.
662 */
663 int
664 acquire_apic_timer(void)
665 {
666 #if 1
667 return 0;
668 #else
669 /** XXX FIXME: make this really do something */
670 panic("APIC timer in use when attempting to aquire");
671 #endif
672 }
673
674
675 /*
676 * Return the APIC timer.
677 */
678 int
679 release_apic_timer(void)
680 {
681 #if 1
682 return 0;
683 #else
684 /** XXX FIXME: make this really do something */
685 panic("APIC timer was already released");
686 #endif
687 }
688 #endif /* READY */
689
690
691 /*
692 * Load a 'downcount time' in uSeconds.
693 */
694 void
695 set_apic_timer(int value)
696 {
697 u_long lvtt;
698 long ticks_per_microsec;
699
700 /*
701 * Calculate divisor and count from value:
702 *
703 * timeBase == CPU bus clock divisor == [1,2,4,8,16,32,64,128]
704 * value == time in uS
705 */
706 lapic.dcr_timer = APIC_TDCR_1;
707 ticks_per_microsec = bus_clock() / 1000000;
708
709 /* configure timer as one-shot */
710 lvtt = lapic.lvt_timer;
711 lvtt &= ~(APIC_LVTT_VECTOR | APIC_LVTT_DS | APIC_LVTT_M | APIC_LVTT_TM);
712 lvtt |= APIC_LVTT_M; /* no INT, one-shot */
713 lapic.lvt_timer = lvtt;
714
715 /* */
716 lapic.icr_timer = value * ticks_per_microsec;
717 }
718
719
720 /*
721 * Read remaining time in timer.
722 */
723 int
724 read_apic_timer(void)
725 {
726 #if 0
727 /** XXX FIXME: we need to return the actual remaining time,
728 * for now we just return the remaining count.
729 */
730 #else
731 return lapic.ccr_timer;
732 #endif
733 }
734
735
736 /*
737 * Spin-style delay, set delay time in uS, spin till it drains.
738 */
739 void
740 u_sleep(int count)
741 {
742 set_apic_timer(count);
743 while (read_apic_timer())
744 /* spin */ ;
745 }
746
747 /*
748 * IOAPIC access helper functions.
749 */
750 u_int
751 io_apic_read(int idx, int reg)
752 {
753 volatile ioapic_t *apic;
754
755 apic = ioapic[idx];
756 apic->ioregsel = reg;
757 return apic->iowin;
758 }
759
760 void
761 io_apic_write(int idx, int reg, u_int value)
762 {
763 volatile ioapic_t *apic;
764
765 apic = ioapic[idx];
766 apic->ioregsel = reg;
767 apic->iowin = value;
768 }
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