2 * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
3 * Copyright (c) 1996, by Steve Passe
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. The name of the developer may NOT be used to endorse or promote products
12 * derived from this software without specific prior written permission.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Local APIC support on Pentium and later processors.
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "opt_hwpmc_hooks.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/kernel.h>
46 #include <sys/mutex.h>
53 #include <machine/apicreg.h>
54 #include <machine/cpu.h>
55 #include <machine/cputypes.h>
56 #include <machine/frame.h>
57 #include <machine/intr_machdep.h>
58 #include <machine/apicvar.h>
59 #include <machine/md_var.h>
60 #include <machine/smp.h>
61 #include <machine/specialreg.h>
64 #include <sys/interrupt.h>
69 * We can handle up to 60 APICs via our logical cluster IDs, but currently
70 * the physical IDs on Intel processors up to the Pentium 4 are limited to
75 /* Sanity checks on IDT vectors. */
76 CTASSERT(APIC_IO_INTS + APIC_NUM_IOINTS == APIC_TIMER_INT);
77 CTASSERT(APIC_TIMER_INT < APIC_LOCAL_INTS);
78 CTASSERT(APIC_LOCAL_INTS == 240);
79 CTASSERT(IPI_STOP < APIC_SPURIOUS_INT);
81 #define LAPIC_TIMER_HZ_DIVIDER 2
82 #define LAPIC_TIMER_STATHZ_DIVIDER 15
83 #define LAPIC_TIMER_PROFHZ_DIVIDER 3
85 /* Magic IRQ values for the timer and syscalls. */
86 #define IRQ_TIMER (NUM_IO_INTS + 1)
87 #define IRQ_SYSCALL (NUM_IO_INTS + 2)
90 * Support for local APICs. Local APICs manage interrupts on each
91 * individual processor as opposed to I/O APICs which receive interrupts
92 * from I/O devices and then forward them on to the local APICs.
94 * Local APICs can also send interrupts to each other thus providing the
99 u_int lvt_edgetrigger:1;
100 u_int lvt_activehi:1;
108 struct lvt la_lvts[LVT_MAX + 1];
111 u_int la_cluster_id:2;
113 u_long *la_timer_count;
114 u_long la_hard_ticks;
115 u_long la_stat_ticks;
116 u_long la_prof_ticks;
117 } static lapics[MAX_APICID];
119 /* XXX: should thermal be an NMI? */
121 /* Global defaults for local APIC LVT entries. */
122 static struct lvt lvts[LVT_MAX + 1] = {
123 { 1, 1, 1, 1, APIC_LVT_DM_EXTINT, 0 }, /* LINT0: masked ExtINT */
124 { 1, 1, 0, 1, APIC_LVT_DM_NMI, 0 }, /* LINT1: NMI */
125 { 1, 1, 1, 1, APIC_LVT_DM_FIXED, APIC_TIMER_INT }, /* Timer */
126 { 1, 1, 1, 1, APIC_LVT_DM_FIXED, APIC_ERROR_INT }, /* Error */
127 { 1, 1, 0, 1, APIC_LVT_DM_NMI, 0 }, /* PMC */
128 { 1, 1, 1, 1, APIC_LVT_DM_FIXED, APIC_THERMAL_INT }, /* Thermal */
131 static inthand_t *ioint_handlers[] = {
133 IDTVEC(apic_isr1), /* 32 - 63 */
134 IDTVEC(apic_isr2), /* 64 - 95 */
135 IDTVEC(apic_isr3), /* 96 - 127 */
136 IDTVEC(apic_isr4), /* 128 - 159 */
137 IDTVEC(apic_isr5), /* 160 - 191 */
138 IDTVEC(apic_isr6), /* 192 - 223 */
139 IDTVEC(apic_isr7), /* 224 - 255 */
142 /* Include IDT_SYSCALL to make indexing easier. */
143 static u_int ioint_irqs[APIC_NUM_IOINTS + 1];
145 static u_int32_t lapic_timer_divisors[] = {
146 APIC_TDCR_1, APIC_TDCR_2, APIC_TDCR_4, APIC_TDCR_8, APIC_TDCR_16,
147 APIC_TDCR_32, APIC_TDCR_64, APIC_TDCR_128
150 volatile lapic_t *lapic;
151 static u_long lapic_timer_divisor, lapic_timer_period, lapic_timer_hz;
153 static void lapic_enable(void);
154 static void lapic_timer_enable_intr(void);
155 static void lapic_timer_oneshot(u_int count);
156 static void lapic_timer_periodic(u_int count);
157 static void lapic_timer_set_divisor(u_int divisor);
158 static uint32_t lvt_mode(struct lapic *la, u_int pin, uint32_t value);
161 lvt_mode(struct lapic *la, u_int pin, uint32_t value)
165 KASSERT(pin <= LVT_MAX, ("%s: pin %u out of range", __func__, pin));
166 if (la->la_lvts[pin].lvt_active)
167 lvt = &la->la_lvts[pin];
171 value &= ~(APIC_LVT_M | APIC_LVT_TM | APIC_LVT_IIPP | APIC_LVT_DM |
173 if (lvt->lvt_edgetrigger == 0)
174 value |= APIC_LVT_TM;
175 if (lvt->lvt_activehi == 0)
176 value |= APIC_LVT_IIPP_INTALO;
179 value |= lvt->lvt_mode;
180 switch (lvt->lvt_mode) {
181 case APIC_LVT_DM_NMI:
182 case APIC_LVT_DM_SMI:
183 case APIC_LVT_DM_INIT:
184 case APIC_LVT_DM_EXTINT:
185 if (!lvt->lvt_edgetrigger) {
186 printf("lapic%u: Forcing LINT%u to edge trigger\n",
188 value |= APIC_LVT_TM;
190 /* Use a vector of 0. */
192 case APIC_LVT_DM_FIXED:
193 value |= lvt->lvt_vector;
196 panic("bad APIC LVT delivery mode: %#x\n", value);
202 * Map the local APIC and setup necessary interrupt vectors.
205 lapic_init(uintptr_t addr)
208 /* Map the local APIC and setup the spurious interrupt handler. */
209 KASSERT(trunc_page(addr) == addr,
210 ("local APIC not aligned on a page boundary"));
211 lapic = (lapic_t *)pmap_mapdev(addr, sizeof(lapic_t));
212 setidt(APIC_SPURIOUS_INT, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
214 /* Perform basic initialization of the BSP's local APIC. */
216 ioint_irqs[IDT_SYSCALL - APIC_IO_INTS] = IRQ_SYSCALL;
218 /* Set BSP's per-CPU local APIC ID. */
219 PCPU_SET(apic_id, lapic_id());
220 intr_add_cpu(PCPU_GET(apic_id));
222 /* Local APIC timer interrupt. */
223 setidt(APIC_TIMER_INT, IDTVEC(timerint), SDT_SYSIGT, SEL_KPL, 0);
224 ioint_irqs[APIC_TIMER_INT - APIC_IO_INTS] = IRQ_TIMER;
226 /* XXX: error/thermal interrupts */
230 * Create a local APIC instance.
233 lapic_create(u_int apic_id, int boot_cpu)
237 if (apic_id >= MAX_APICID) {
238 printf("APIC: Ignoring local APIC with ID %d\n", apic_id);
240 panic("Can't ignore BSP");
243 KASSERT(!lapics[apic_id].la_present, ("duplicate local APIC %u",
247 * Assume no local LVT overrides and a cluster of 0 and
248 * intra-cluster ID of 0.
250 lapics[apic_id].la_present = 1;
251 lapics[apic_id].la_id = apic_id;
252 for (i = 0; i < LVT_MAX; i++) {
253 lapics[apic_id].la_lvts[i] = lvts[i];
254 lapics[apic_id].la_lvts[i].lvt_active = 0;
258 cpu_add(apic_id, boot_cpu);
263 * Dump contents of local APIC registers
266 lapic_dump(const char* str)
269 printf("cpu%d %s:\n", PCPU_GET(cpuid), str);
270 printf(" ID: 0x%08x VER: 0x%08x LDR: 0x%08x DFR: 0x%08x\n",
271 lapic->id, lapic->version, lapic->ldr, lapic->dfr);
272 printf(" lint0: 0x%08x lint1: 0x%08x TPR: 0x%08x SVR: 0x%08x\n",
273 lapic->lvt_lint0, lapic->lvt_lint1, lapic->tpr, lapic->svr);
274 printf(" timer: 0x%08x therm: 0x%08x err: 0x%08x pcm: 0x%08x\n",
275 lapic->lvt_timer, lapic->lvt_thermal, lapic->lvt_error,
285 char buf[MAXCOMLEN + 1];
287 la = &lapics[lapic_id()];
288 KASSERT(la->la_present, ("missing APIC structure"));
289 eflags = intr_disable();
290 maxlvt = (lapic->version & APIC_VER_MAXLVT) >> MAXLVTSHIFT;
292 /* Initialize the TPR to allow all interrupts. */
295 /* Setup spurious vector and enable the local APIC. */
298 /* Program LINT[01] LVT entries. */
299 lapic->lvt_lint0 = lvt_mode(la, LVT_LINT0, lapic->lvt_lint0);
300 lapic->lvt_lint1 = lvt_mode(la, LVT_LINT1, lapic->lvt_lint1);
302 /* Program the PMC LVT entry if present. */
303 if (maxlvt >= LVT_PMC)
304 lapic->lvt_pcint = lvt_mode(la, LVT_PMC, lapic->lvt_pcint);
307 /* Program timer LVT and setup handler. */
308 lapic->lvt_timer = lvt_mode(la, LVT_TIMER, lapic->lvt_timer);
309 snprintf(buf, sizeof(buf), "cpu%d: timer", PCPU_GET(cpuid));
310 intrcnt_add(buf, &la->la_timer_count);
311 if (PCPU_GET(cpuid) != 0) {
312 KASSERT(lapic_timer_period != 0, ("lapic%u: zero divisor",
314 lapic_timer_set_divisor(lapic_timer_divisor);
315 lapic_timer_periodic(lapic_timer_period);
316 lapic_timer_enable_intr();
319 /* XXX: Error and thermal LVTs */
321 intr_restore(eflags);
325 * Called by cpu_initclocks() on the BSP to setup the local APIC timer so
326 * that it can drive hardclock, statclock, and profclock. This function
327 * returns true if it is able to use the local APIC timer to drive the
328 * clocks and false if it is not able.
331 lapic_setup_clock(void)
335 /* Can't drive the timer without a local APIC. */
339 /* Start off with a divisor of 2 (power on reset default). */
340 lapic_timer_divisor = 2;
342 /* Try to calibrate the local APIC timer. */
344 lapic_timer_set_divisor(lapic_timer_divisor);
345 lapic_timer_oneshot(APIC_TIMER_MAX_COUNT);
347 value = APIC_TIMER_MAX_COUNT - lapic->ccr_timer;
348 if (value != APIC_TIMER_MAX_COUNT)
350 lapic_timer_divisor <<= 1;
351 } while (lapic_timer_divisor <= 128);
352 if (lapic_timer_divisor > 128)
353 panic("lapic: Divisor too big");
356 printf("lapic: Divisor %lu, Frequency %lu hz\n",
357 lapic_timer_divisor, value);
360 * We will drive the timer at a small multiple of hz and drive
361 * both of the other timers with similarly small but relatively
364 lapic_timer_hz = hz * LAPIC_TIMER_HZ_DIVIDER;
365 stathz = lapic_timer_hz / LAPIC_TIMER_STATHZ_DIVIDER;
366 profhz = lapic_timer_hz / LAPIC_TIMER_PROFHZ_DIVIDER;
367 lapic_timer_period = value / lapic_timer_hz;
370 * Start up the timer on the BSP. The APs will kick off their
371 * timer during lapic_setup().
373 lapic_timer_periodic(lapic_timer_period);
374 lapic_timer_enable_intr();
383 /* Software disable the local APIC. */
385 value &= ~APIC_SVR_SWEN;
394 /* Program the spurious vector to enable the local APIC. */
396 value &= ~(APIC_SVR_VECTOR | APIC_SVR_FOCUS);
397 value |= (APIC_SVR_FEN | APIC_SVR_SWEN | APIC_SPURIOUS_INT);
405 KASSERT(lapic != NULL, ("local APIC is not mapped"));
406 return (lapic->id >> APIC_ID_SHIFT);
410 lapic_intr_pending(u_int vector)
412 volatile u_int32_t *irr;
415 * The IRR registers are an array of 128-bit registers each of
416 * which only describes 32 interrupts in the low 32 bits.. Thus,
417 * we divide the vector by 32 to get the 128-bit index. We then
418 * multiply that index by 4 to get the equivalent index from
419 * treating the IRR as an array of 32-bit registers. Finally, we
420 * modulus the vector by 32 to determine the individual bit to
424 return (irr[(vector / 32) * 4] & 1 << (vector % 32));
428 lapic_set_logical_id(u_int apic_id, u_int cluster, u_int cluster_id)
432 KASSERT(lapics[apic_id].la_present, ("%s: APIC %u doesn't exist",
434 KASSERT(cluster <= APIC_MAX_CLUSTER, ("%s: cluster %u too big",
436 KASSERT(cluster_id <= APIC_MAX_INTRACLUSTER_ID,
437 ("%s: intra cluster id %u too big", __func__, cluster_id));
438 la = &lapics[apic_id];
439 la->la_cluster = cluster;
440 la->la_cluster_id = cluster_id;
444 lapic_set_lvt_mask(u_int apic_id, u_int pin, u_char masked)
449 if (apic_id == APIC_ID_ALL) {
450 lvts[pin].lvt_masked = masked;
454 KASSERT(lapics[apic_id].la_present,
455 ("%s: missing APIC %u", __func__, apic_id));
456 lapics[apic_id].la_lvts[pin].lvt_masked = masked;
457 lapics[apic_id].la_lvts[pin].lvt_active = 1;
459 printf("lapic%u:", apic_id);
462 printf(" LINT%u %s\n", pin, masked ? "masked" : "unmasked");
467 lapic_set_lvt_mode(u_int apic_id, u_int pin, u_int32_t mode)
473 if (apic_id == APIC_ID_ALL) {
478 KASSERT(lapics[apic_id].la_present,
479 ("%s: missing APIC %u", __func__, apic_id));
480 lvt = &lapics[apic_id].la_lvts[pin];
483 printf("lapic%u:", apic_id);
485 lvt->lvt_mode = mode;
487 case APIC_LVT_DM_NMI:
488 case APIC_LVT_DM_SMI:
489 case APIC_LVT_DM_INIT:
490 case APIC_LVT_DM_EXTINT:
491 lvt->lvt_edgetrigger = 1;
492 lvt->lvt_activehi = 1;
493 if (mode == APIC_LVT_DM_EXTINT)
499 panic("Unsupported delivery mode: 0x%x\n", mode);
504 case APIC_LVT_DM_NMI:
507 case APIC_LVT_DM_SMI:
510 case APIC_LVT_DM_INIT:
513 case APIC_LVT_DM_EXTINT:
517 printf(" -> LINT%u\n", pin);
523 lapic_set_lvt_polarity(u_int apic_id, u_int pin, enum intr_polarity pol)
526 if (pin > LVT_MAX || pol == INTR_POLARITY_CONFORM)
528 if (apic_id == APIC_ID_ALL) {
529 lvts[pin].lvt_activehi = (pol == INTR_POLARITY_HIGH);
533 KASSERT(lapics[apic_id].la_present,
534 ("%s: missing APIC %u", __func__, apic_id));
535 lapics[apic_id].la_lvts[pin].lvt_active = 1;
536 lapics[apic_id].la_lvts[pin].lvt_activehi =
537 (pol == INTR_POLARITY_HIGH);
539 printf("lapic%u:", apic_id);
542 printf(" LINT%u polarity: %s\n", pin,
543 pol == INTR_POLARITY_HIGH ? "high" : "low");
548 lapic_set_lvt_triggermode(u_int apic_id, u_int pin, enum intr_trigger trigger)
551 if (pin > LVT_MAX || trigger == INTR_TRIGGER_CONFORM)
553 if (apic_id == APIC_ID_ALL) {
554 lvts[pin].lvt_edgetrigger = (trigger == INTR_TRIGGER_EDGE);
558 KASSERT(lapics[apic_id].la_present,
559 ("%s: missing APIC %u", __func__, apic_id));
560 lapics[apic_id].la_lvts[pin].lvt_edgetrigger =
561 (trigger == INTR_TRIGGER_EDGE);
562 lapics[apic_id].la_lvts[pin].lvt_active = 1;
564 printf("lapic%u:", apic_id);
567 printf(" LINT%u trigger: %s\n", pin,
568 trigger == INTR_TRIGGER_EDGE ? "edge" : "level");
573 * Adjust the TPR of the current CPU so that it blocks all interrupts below
574 * the passed in vector.
577 lapic_set_tpr(u_int vector)
584 tpr = lapic->tpr & ~APIC_TPR_PRIO;
598 lapic_handle_intr(int vector, struct trapframe frame)
603 panic("Couldn't get vector from ISR!");
604 isrc = intr_lookup_source(apic_idt_to_irq(vector));
605 intr_execute_handlers(isrc, &frame);
609 lapic_handle_timer(struct trapframe frame)
613 /* Send EOI first thing. */
616 /* Look up our local APIC structure for the tick counters. */
617 la = &lapics[PCPU_GET(apic_id)];
618 (*la->la_timer_count)++;
621 /* Fire hardclock at hz. */
622 la->la_hard_ticks += hz;
623 if (la->la_hard_ticks >= lapic_timer_hz) {
624 la->la_hard_ticks -= lapic_timer_hz;
625 if (PCPU_GET(cpuid) == 0)
626 hardclock(TRAPF_USERMODE(&frame), TRAPF_PC(&frame));
628 hardclock_cpu(TRAPF_USERMODE(&frame));
631 /* Fire statclock at stathz. */
632 la->la_stat_ticks += stathz;
633 if (la->la_stat_ticks >= lapic_timer_hz) {
634 la->la_stat_ticks -= lapic_timer_hz;
635 statclock(TRAPF_USERMODE(&frame));
638 /* Fire profclock at profhz, but only when needed. */
639 la->la_prof_ticks += profhz;
640 if (la->la_prof_ticks >= lapic_timer_hz) {
641 la->la_prof_ticks -= lapic_timer_hz;
643 profclock(TRAPF_USERMODE(&frame), TRAPF_PC(&frame));
649 lapic_timer_set_divisor(u_int divisor)
652 KASSERT(powerof2(divisor), ("lapic: invalid divisor %u", divisor));
653 KASSERT(ffs(divisor) <= sizeof(lapic_timer_divisors) /
654 sizeof(u_int32_t), ("lapic: invalid divisor %u", divisor));
655 lapic->dcr_timer = lapic_timer_divisors[ffs(divisor) - 1];
659 lapic_timer_oneshot(u_int count)
663 value = lapic->lvt_timer;
664 value &= ~APIC_LVTT_TM;
665 value |= APIC_LVTT_TM_ONE_SHOT;
666 lapic->lvt_timer = value;
667 lapic->icr_timer = count;
671 lapic_timer_periodic(u_int count)
675 value = lapic->lvt_timer;
676 value &= ~APIC_LVTT_TM;
677 value |= APIC_LVTT_TM_PERIODIC;
678 lapic->lvt_timer = value;
679 lapic->icr_timer = count;
683 lapic_timer_enable_intr(void)
687 value = lapic->lvt_timer;
688 value &= ~APIC_LVT_M;
689 lapic->lvt_timer = value;
692 /* Request a free IDT vector to be used by the specified IRQ. */
694 apic_alloc_vector(u_int irq)
698 KASSERT(irq < NUM_IO_INTS, ("Invalid IRQ %u", irq));
701 * Search for a free vector. Currently we just use a very simple
702 * algorithm to find the first free vector.
704 mtx_lock_spin(&icu_lock);
705 for (vector = 0; vector < APIC_NUM_IOINTS; vector++) {
706 if (ioint_irqs[vector] != 0)
708 ioint_irqs[vector] = irq;
709 mtx_unlock_spin(&icu_lock);
710 return (vector + APIC_IO_INTS);
712 mtx_unlock_spin(&icu_lock);
713 panic("Couldn't find an APIC vector for IRQ %u", irq);
717 apic_enable_vector(u_int vector)
720 KASSERT(vector != IDT_SYSCALL, ("Attempt to overwrite syscall entry"));
721 KASSERT(ioint_handlers[vector / 32] != NULL,
722 ("No ISR handler for vector %u", vector));
723 setidt(vector, ioint_handlers[vector / 32], SDT_SYSIGT, SEL_KPL, 0);
726 /* Release an APIC vector when it's no longer in use. */
728 apic_free_vector(u_int vector, u_int irq)
730 KASSERT(vector >= APIC_IO_INTS && vector != IDT_SYSCALL &&
731 vector <= APIC_IO_INTS + APIC_NUM_IOINTS,
732 ("Vector %u does not map to an IRQ line", vector));
733 KASSERT(irq < NUM_IO_INTS, ("Invalid IRQ %u", irq));
734 KASSERT(ioint_irqs[vector - APIC_IO_INTS] == irq, ("IRQ mismatch"));
735 mtx_lock_spin(&icu_lock);
736 ioint_irqs[vector - APIC_IO_INTS] = 0;
737 mtx_unlock_spin(&icu_lock);
740 /* Map an IDT vector (APIC) to an IRQ (interrupt source). */
742 apic_idt_to_irq(u_int vector)
745 KASSERT(vector >= APIC_IO_INTS && vector != IDT_SYSCALL &&
746 vector <= APIC_IO_INTS + APIC_NUM_IOINTS,
747 ("Vector %u does not map to an IRQ line", vector));
748 return (ioint_irqs[vector - APIC_IO_INTS]);
753 * Dump data about APIC IDT vector mappings.
755 DB_SHOW_COMMAND(apic, db_show_apic)
758 int quit, i, verbose;
762 if (strcmp(modif, "vv") == 0)
764 else if (strcmp(modif, "v") == 0)
768 db_setup_paging(db_simple_pager, &quit, db_lines_per_page);
769 for (i = 0; i < APIC_NUM_IOINTS + 1 && !quit; i++) {
771 if (irq != 0 && irq != IRQ_SYSCALL) {
772 db_printf("vec 0x%2x -> ", i + APIC_IO_INTS);
773 if (irq == IRQ_TIMER)
774 db_printf("lapic timer\n");
775 else if (irq < NUM_IO_INTS) {
776 isrc = intr_lookup_source(irq);
777 if (isrc == NULL || verbose == 0)
778 db_printf("IRQ %u\n", irq);
780 db_dump_intr_event(isrc->is_event,
783 db_printf("IRQ %u ???\n", irq);
790 * APIC probing support code. This includes code to manage enumerators.
793 static SLIST_HEAD(, apic_enumerator) enumerators =
794 SLIST_HEAD_INITIALIZER(enumerators);
795 static struct apic_enumerator *best_enum;
798 apic_register_enumerator(struct apic_enumerator *enumerator)
801 struct apic_enumerator *apic_enum;
803 SLIST_FOREACH(apic_enum, &enumerators, apic_next) {
804 if (apic_enum == enumerator)
805 panic("%s: Duplicate register of %s", __func__,
806 enumerator->apic_name);
809 SLIST_INSERT_HEAD(&enumerators, enumerator, apic_next);
813 * We have to look for CPU's very, very early because certain subsystems
814 * want to know how many CPU's we have extremely early on in the boot
818 apic_init(void *dummy __unused)
820 struct apic_enumerator *enumerator;
823 /* We only support built in local APICs. */
824 if (!(cpu_feature & CPUID_APIC))
827 /* Don't probe if APIC mode is disabled. */
828 if (resource_disabled("apic", 0))
831 /* First, probe all the enumerators to find the best match. */
834 SLIST_FOREACH(enumerator, &enumerators, apic_next) {
835 retval = enumerator->apic_probe();
838 if (best_enum == NULL || best < retval) {
839 best_enum = enumerator;
843 if (best_enum == NULL) {
845 printf("APIC: Could not find any APICs.\n");
850 printf("APIC: Using the %s enumerator.\n",
851 best_enum->apic_name);
853 /* Second, probe the CPU's in the system. */
854 retval = best_enum->apic_probe_cpus();
856 printf("%s: Failed to probe CPUs: returned %d\n",
857 best_enum->apic_name, retval);
859 SYSINIT(apic_init, SI_SUB_TUNABLES - 1, SI_ORDER_SECOND, apic_init, NULL)
862 * Setup the local APIC. We have to do this prior to starting up the APs
866 apic_setup_local(void *dummy __unused)
870 if (best_enum == NULL)
872 retval = best_enum->apic_setup_local();
874 printf("%s: Failed to setup the local APIC: returned %d\n",
875 best_enum->apic_name, retval);
877 /* Last, setup the cpu topology now that we have probed CPUs */
881 SYSINIT(apic_setup_local, SI_SUB_CPU, SI_ORDER_FIRST, apic_setup_local, NULL)
884 * Setup the I/O APICs.
887 apic_setup_io(void *dummy __unused)
891 if (best_enum == NULL)
893 retval = best_enum->apic_setup_io();
895 printf("%s: Failed to setup I/O APICs: returned %d\n",
896 best_enum->apic_name, retval);
899 * Finish setting up the local APIC on the BSP once we know how to
900 * properly program the LINT pins.
906 SYSINIT(apic_setup_io, SI_SUB_INTR, SI_ORDER_SECOND, apic_setup_io, NULL)
910 * Inter Processor Interrupt functions. The lapic_ipi_*() functions are
911 * private to the sys/amd64 code. The public interface for the rest of the
912 * kernel is defined in mp_machdep.c.
915 lapic_ipi_wait(int delay)
920 * Wait delay loops for IPI to be sent. This is highly bogus
921 * since this is sensitive to CPU clock speed. If delay is
922 * -1, we wait forever.
929 for (x = 0; x < delay; x += incr) {
930 if ((lapic->icr_lo & APIC_DELSTAT_MASK) == APIC_DELSTAT_IDLE)
938 lapic_ipi_raw(register_t icrlo, u_int dest)
940 register_t value, eflags;
942 /* XXX: Need more sanity checking of icrlo? */
943 KASSERT(lapic != NULL, ("%s called too early", __func__));
944 KASSERT((dest & ~(APIC_ID_MASK >> APIC_ID_SHIFT)) == 0,
945 ("%s: invalid dest field", __func__));
946 KASSERT((icrlo & APIC_ICRLO_RESV_MASK) == 0,
947 ("%s: reserved bits set in ICR LO register", __func__));
949 /* Set destination in ICR HI register if it is being used. */
950 eflags = intr_disable();
951 if ((icrlo & APIC_DEST_MASK) == APIC_DEST_DESTFLD) {
952 value = lapic->icr_hi;
953 value &= ~APIC_ID_MASK;
954 value |= dest << APIC_ID_SHIFT;
955 lapic->icr_hi = value;
958 /* Program the contents of the IPI and dispatch it. */
959 value = lapic->icr_lo;
960 value &= APIC_ICRLO_RESV_MASK;
962 lapic->icr_lo = value;
963 intr_restore(eflags);
966 #define BEFORE_SPIN 1000000
967 #ifdef DETECT_DEADLOCK
968 #define AFTER_SPIN 1000
972 lapic_ipi_vectored(u_int vector, int dest)
974 register_t icrlo, destfield;
976 KASSERT((vector & ~APIC_VECTOR_MASK) == 0,
977 ("%s: invalid vector %d", __func__, vector));
979 icrlo = vector | APIC_DELMODE_FIXED | APIC_DESTMODE_PHY |
980 APIC_LEVEL_DEASSERT | APIC_TRIGMOD_EDGE;
983 case APIC_IPI_DEST_SELF:
984 icrlo |= APIC_DEST_SELF;
986 case APIC_IPI_DEST_ALL:
987 icrlo |= APIC_DEST_ALLISELF;
989 case APIC_IPI_DEST_OTHERS:
990 icrlo |= APIC_DEST_ALLESELF;
993 KASSERT((dest & ~(APIC_ID_MASK >> APIC_ID_SHIFT)) == 0,
994 ("%s: invalid destination 0x%x", __func__, dest));
998 /* Wait for an earlier IPI to finish. */
999 if (!lapic_ipi_wait(BEFORE_SPIN)) {
1000 if (panicstr != NULL)
1003 panic("APIC: Previous IPI is stuck");
1006 lapic_ipi_raw(icrlo, destfield);
1008 #ifdef DETECT_DEADLOCK
1009 /* Wait for IPI to be delivered. */
1010 if (!lapic_ipi_wait(AFTER_SPIN)) {
1011 #ifdef needsattention
1015 * The above function waits for the message to actually be
1016 * delivered. It breaks out after an arbitrary timeout
1017 * since the message should eventually be delivered (at
1018 * least in theory) and that if it wasn't we would catch
1019 * the failure with the check above when the next IPI is
1022 * We could skip this wait entirely, EXCEPT it probably
1023 * protects us from other routines that assume that the
1024 * message was delivered and acted upon when this function
1027 printf("APIC: IPI might be stuck\n");
1028 #else /* !needsattention */
1029 /* Wait until mesage is sent without a timeout. */
1030 while (lapic->icr_lo & APIC_DELSTAT_PEND)
1032 #endif /* needsattention */
1034 #endif /* DETECT_DEADLOCK */