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>
49 volatile lapic_t *lapic;
51 static void lapic_timer_calibrate(void);
52 static void lapic_timer_set_divisor(int);
53 static void lapic_timer_fixup_handler(void *);
54 static void lapic_timer_restart_handler(void *);
56 void lapic_timer_process(void);
57 void lapic_timer_process_frame(struct intrframe *);
58 void lapic_timer_always(struct intrframe *);
60 static int lapic_timer_enable = 1;
61 TUNABLE_INT("hw.lapic_timer_enable", &lapic_timer_enable);
63 static void lapic_timer_intr_reload(struct cputimer_intr *, sysclock_t);
64 static void lapic_timer_intr_enable(struct cputimer_intr *);
65 static void lapic_timer_intr_restart(struct cputimer_intr *);
66 static void lapic_timer_intr_pmfixup(struct cputimer_intr *);
68 static struct cputimer_intr lapic_cputimer_intr = {
70 .reload = lapic_timer_intr_reload,
71 .enable = lapic_timer_intr_enable,
72 .config = cputimer_intr_default_config,
73 .restart = lapic_timer_intr_restart,
74 .pmfixup = lapic_timer_intr_pmfixup,
75 .initclock = cputimer_intr_default_initclock,
76 .next = SLIST_ENTRY_INITIALIZER,
78 .type = CPUTIMER_INTR_LAPIC,
79 .prio = CPUTIMER_INTR_PRIO_LAPIC,
80 .caps = CPUTIMER_INTR_CAP_NONE
83 static int lapic_timer_divisor_idx = -1;
84 static const uint32_t lapic_timer_divisors[] = {
85 APIC_TDCR_2, APIC_TDCR_4, APIC_TDCR_8, APIC_TDCR_16,
86 APIC_TDCR_32, APIC_TDCR_64, APIC_TDCR_128, APIC_TDCR_1
88 #define APIC_TIMER_NDIVISORS (int)(NELEM(lapic_timer_divisors))
91 * APIC ID <-> CPU ID mapping structures.
93 int cpu_id_to_apic_id[NAPICID];
94 int apic_id_to_cpu_id[NAPICID];
104 * Enable LAPIC, configure interrupts.
107 lapic_init(boolean_t bsp)
115 * Since IDT is shared between BSP and APs, these vectors
116 * only need to be installed once; we do it on BSP.
119 /* Install a 'Spurious INTerrupt' vector */
120 setidt(XSPURIOUSINT_OFFSET, Xspuriousint,
121 SDT_SYSIGT, SEL_KPL, 0);
123 /* Install an inter-CPU IPI for TLB invalidation */
124 setidt(XINVLTLB_OFFSET, Xinvltlb,
125 SDT_SYSIGT, SEL_KPL, 0);
127 /* Install an inter-CPU IPI for IPIQ messaging */
128 setidt(XIPIQ_OFFSET, Xipiq,
129 SDT_SYSIGT, SEL_KPL, 0);
131 /* Install a timer vector */
132 setidt(XTIMER_OFFSET, Xtimer,
133 SDT_SYSIGT, SEL_KPL, 0);
135 /* Install an inter-CPU IPI for CPU stop/restart */
136 setidt(XCPUSTOP_OFFSET, Xcpustop,
137 SDT_SYSIGT, SEL_KPL, 0);
141 * Setup LINT0 as ExtINT on the BSP. This is theoretically an
142 * aggregate interrupt input from the 8259. The INTA cycle
143 * will be routed to the external controller (the 8259) which
144 * is expected to supply the vector.
146 * Must be setup edge triggered, active high.
148 * Disable LINT0 on BSP, if I/O APIC is enabled.
150 * Disable LINT0 on the APs. It doesn't matter what delivery
151 * mode we use because we leave it masked.
153 temp = lapic->lvt_lint0;
154 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
155 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
157 temp |= APIC_LVT_DM_EXTINT;
159 temp |= APIC_LVT_MASKED;
161 temp |= APIC_LVT_DM_FIXED | APIC_LVT_MASKED;
163 lapic->lvt_lint0 = temp;
166 * Setup LINT1 as NMI.
168 * Must be setup edge trigger, active high.
170 * Enable LINT1 on BSP, if I/O APIC is enabled.
172 * Disable LINT1 on the APs.
174 temp = lapic->lvt_lint1;
175 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
176 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
177 temp |= APIC_LVT_MASKED | APIC_LVT_DM_NMI;
178 if (bsp && ioapic_enable)
179 temp &= ~APIC_LVT_MASKED;
180 lapic->lvt_lint1 = temp;
183 * Mask the LAPIC error interrupt, LAPIC performance counter
186 lapic->lvt_error = lapic->lvt_error | APIC_LVT_MASKED;
187 lapic->lvt_pcint = lapic->lvt_pcint | APIC_LVT_MASKED;
190 * Set LAPIC timer vector and mask the LAPIC timer interrupt.
192 timer = lapic->lvt_timer;
193 timer &= ~APIC_LVTT_VECTOR;
194 timer |= XTIMER_OFFSET;
195 timer |= APIC_LVTT_MASKED;
196 lapic->lvt_timer = timer;
199 * Set the Task Priority Register as needed. At the moment allow
200 * interrupts on all cpus (the APs will remain CLId until they are
204 temp &= ~APIC_TPR_PRIO; /* clear priority field */
211 temp |= APIC_SVR_ENABLE; /* enable the LAPIC */
212 temp &= ~APIC_SVR_FOCUS_DISABLE; /* enable lopri focus processor */
215 * Set the spurious interrupt vector. The low 4 bits of the vector
218 if ((XSPURIOUSINT_OFFSET & 0x0F) != 0x0F)
219 panic("bad XSPURIOUSINT_OFFSET: 0x%08x", XSPURIOUSINT_OFFSET);
220 temp &= ~APIC_SVR_VECTOR;
221 temp |= XSPURIOUSINT_OFFSET;
226 * Pump out a few EOIs to clean out interrupts that got through
227 * before we were able to set the TPR.
234 lapic_timer_calibrate();
235 if (lapic_timer_enable) {
236 cputimer_intr_register(&lapic_cputimer_intr);
237 cputimer_intr_select(&lapic_cputimer_intr, 0);
240 lapic_timer_set_divisor(lapic_timer_divisor_idx);
244 apic_dump("apic_initialize()");
248 lapic_timer_set_divisor(int divisor_idx)
250 KKASSERT(divisor_idx >= 0 && divisor_idx < APIC_TIMER_NDIVISORS);
251 lapic->dcr_timer = lapic_timer_divisors[divisor_idx];
255 lapic_timer_oneshot(u_int count)
259 value = lapic->lvt_timer;
260 value &= ~APIC_LVTT_PERIODIC;
261 lapic->lvt_timer = value;
262 lapic->icr_timer = count;
266 lapic_timer_oneshot_quick(u_int count)
268 lapic->icr_timer = count;
272 lapic_timer_calibrate(void)
276 /* Try to calibrate the local APIC timer. */
277 for (lapic_timer_divisor_idx = 0;
278 lapic_timer_divisor_idx < APIC_TIMER_NDIVISORS;
279 lapic_timer_divisor_idx++) {
280 lapic_timer_set_divisor(lapic_timer_divisor_idx);
281 lapic_timer_oneshot(APIC_TIMER_MAX_COUNT);
283 value = APIC_TIMER_MAX_COUNT - lapic->ccr_timer;
284 if (value != APIC_TIMER_MAX_COUNT)
287 if (lapic_timer_divisor_idx >= APIC_TIMER_NDIVISORS)
288 panic("lapic: no proper timer divisor?!\n");
289 lapic_cputimer_intr.freq = value / 2;
291 kprintf("lapic: divisor index %d, frequency %u Hz\n",
292 lapic_timer_divisor_idx, lapic_cputimer_intr.freq);
296 lapic_timer_process_oncpu(struct globaldata *gd, struct intrframe *frame)
300 gd->gd_timer_running = 0;
302 count = sys_cputimer->count();
303 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
304 systimer_intr(&count, 0, frame);
308 lapic_timer_process(void)
310 lapic_timer_process_oncpu(mycpu, NULL);
314 lapic_timer_process_frame(struct intrframe *frame)
316 lapic_timer_process_oncpu(mycpu, frame);
320 * This manual debugging code is called unconditionally from Xtimer
321 * (the lapic timer interrupt) whether the current thread is in a
322 * critical section or not) and can be useful in tracking down lockups.
324 * NOTE: MANUAL DEBUG CODE
327 static int saveticks[SMP_MAXCPU];
328 static int savecounts[SMP_MAXCPU];
332 lapic_timer_always(struct intrframe *frame)
335 globaldata_t gd = mycpu;
336 int cpu = gd->gd_cpuid;
342 gptr = (short *)0xFFFFFFFF800b8000 + 80 * cpu;
343 *gptr = ((*gptr + 1) & 0x00FF) | 0x0700;
346 ksnprintf(buf, sizeof(buf), " %p %16s %d %16s ",
347 (void *)frame->if_rip, gd->gd_curthread->td_comm, ticks,
349 for (i = 0; buf[i]; ++i) {
350 gptr[i] = 0x0700 | (unsigned char)buf[i];
354 if (saveticks[gd->gd_cpuid] != ticks) {
355 saveticks[gd->gd_cpuid] = ticks;
356 savecounts[gd->gd_cpuid] = 0;
358 ++savecounts[gd->gd_cpuid];
359 if (savecounts[gd->gd_cpuid] > 2000 && panicstr == NULL) {
360 panic("cpud %d panicing on ticks failure",
363 for (i = 0; i < ncpus; ++i) {
365 if (saveticks[i] && panicstr == NULL) {
366 delta = saveticks[i] - ticks;
367 if (delta < -10 || delta > 10) {
368 panic("cpu %d panicing on cpu %d watchdog",
378 lapic_timer_intr_reload(struct cputimer_intr *cti, sysclock_t reload)
380 struct globaldata *gd = mycpu;
382 reload = (int64_t)reload * cti->freq / sys_cputimer->freq;
386 if (gd->gd_timer_running) {
387 if (reload < lapic->ccr_timer)
388 lapic_timer_oneshot_quick(reload);
390 gd->gd_timer_running = 1;
391 lapic_timer_oneshot_quick(reload);
396 lapic_timer_intr_enable(struct cputimer_intr *cti __unused)
400 timer = lapic->lvt_timer;
401 timer &= ~(APIC_LVTT_MASKED | APIC_LVTT_PERIODIC);
402 lapic->lvt_timer = timer;
404 lapic_timer_fixup_handler(NULL);
408 lapic_timer_fixup_handler(void *arg)
415 if (strcmp(cpu_vendor, "AuthenticAMD") == 0) {
417 * Detect the presence of C1E capability mostly on latest
418 * dual-cores (or future) k8 family. This feature renders
419 * the local APIC timer dead, so we disable it by reading
420 * the Interrupt Pending Message register and clearing both
421 * C1eOnCmpHalt (bit 28) and SmiOnCmpHalt (bit 27).
424 * "BIOS and Kernel Developer's Guide for AMD NPT
425 * Family 0Fh Processors"
426 * #32559 revision 3.00
428 if ((cpu_id & 0x00000f00) == 0x00000f00 &&
429 (cpu_id & 0x0fff0000) >= 0x00040000) {
432 msr = rdmsr(0xc0010055);
433 if (msr & 0x18000000) {
434 struct globaldata *gd = mycpu;
436 kprintf("cpu%d: AMD C1E detected\n",
438 wrmsr(0xc0010055, msr & ~0x18000000ULL);
441 * We are kinda stalled;
444 gd->gd_timer_running = 1;
445 lapic_timer_oneshot_quick(2);
455 lapic_timer_restart_handler(void *dummy __unused)
459 lapic_timer_fixup_handler(&started);
461 struct globaldata *gd = mycpu;
463 gd->gd_timer_running = 1;
464 lapic_timer_oneshot_quick(2);
469 * This function is called only by ACPI-CA code currently:
470 * - AMD C1E fixup. AMD C1E only seems to happen after ACPI
471 * module controls PM. So once ACPI-CA is attached, we try
472 * to apply the fixup to prevent LAPIC timer from hanging.
475 lapic_timer_intr_pmfixup(struct cputimer_intr *cti __unused)
477 lwkt_send_ipiq_mask(smp_active_mask,
478 lapic_timer_fixup_handler, NULL);
482 lapic_timer_intr_restart(struct cputimer_intr *cti __unused)
484 lwkt_send_ipiq_mask(smp_active_mask, lapic_timer_restart_handler, NULL);
489 * dump contents of local APIC registers
494 kprintf("SMP: CPU%d %s:\n", mycpu->gd_cpuid, str);
495 kprintf(" lint0: 0x%08x lint1: 0x%08x TPR: 0x%08x SVR: 0x%08x\n",
496 lapic->lvt_lint0, lapic->lvt_lint1, lapic->tpr, lapic->svr);
500 * Inter Processor Interrupt functions.
504 * Send APIC IPI 'vector' to 'destType' via 'deliveryMode'.
506 * destType is 1 of: APIC_DEST_SELF, APIC_DEST_ALLISELF, APIC_DEST_ALLESELF
507 * vector is any valid SYSTEM INT vector
508 * delivery_mode is 1 of: APIC_DELMODE_FIXED, APIC_DELMODE_LOWPRIO
510 * A backlog of requests can create a deadlock between cpus. To avoid this
511 * we have to be able to accept IPIs at the same time we are trying to send
512 * them. The critical section prevents us from attempting to send additional
513 * IPIs reentrantly, but also prevents IPIQ processing so we have to call
514 * lwkt_process_ipiq() manually. It's rather messy and expensive for this
515 * to occur but fortunately it does not happen too often.
518 apic_ipi(int dest_type, int vector, int delivery_mode)
523 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
524 unsigned long rflags = read_rflags();
526 DEBUG_PUSH_INFO("apic_ipi");
527 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
531 write_rflags(rflags);
534 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK) | dest_type |
535 delivery_mode | vector;
536 lapic->icr_lo = icr_lo;
542 single_apic_ipi(int cpu, int vector, int delivery_mode)
548 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
549 unsigned long rflags = read_rflags();
551 DEBUG_PUSH_INFO("single_apic_ipi");
552 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
556 write_rflags(rflags);
558 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
559 icr_hi |= (CPUID_TO_APICID(cpu) << 24);
560 lapic->icr_hi = icr_hi;
563 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK)
564 | APIC_DEST_DESTFLD | delivery_mode | vector;
567 lapic->icr_lo = icr_lo;
574 * Returns 0 if the apic is busy, 1 if we were able to queue the request.
576 * NOT WORKING YET! The code as-is may end up not queueing an IPI at all
577 * to the target, and the scheduler does not 'poll' for IPI messages.
580 single_apic_ipi_passive(int cpu, int vector, int delivery_mode)
586 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
590 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
591 icr_hi |= (CPUID_TO_APICID(cpu) << 24);
592 lapic->icr_hi = icr_hi;
595 icr_lo = (lapic->icr_lo & APIC_RESV2_MASK)
596 | APIC_DEST_DESTFLD | delivery_mode | vector;
599 lapic->icr_lo = icr_lo;
607 * Send APIC IPI 'vector' to 'target's via 'delivery_mode'.
609 * target is a bitmask of destination cpus. Vector is any
610 * valid system INT vector. Delivery mode may be either
611 * APIC_DELMODE_FIXED or APIC_DELMODE_LOWPRIO.
614 selected_apic_ipi(cpumask_t target, int vector, int delivery_mode)
618 int n = BSFCPUMASK(target);
619 target &= ~CPUMASK(n);
620 single_apic_ipi(n, vector, delivery_mode);
626 * Timer code, in development...
627 * - suggested by rgrimes@gndrsh.aac.dev.com
630 get_apic_timer_frequency(void)
632 return(lapic_cputimer_intr.freq);
636 * Load a 'downcount time' in uSeconds.
639 set_apic_timer(int us)
644 * When we reach here, lapic timer's frequency
645 * must have been calculated as well as the
646 * divisor (lapic->dcr_timer is setup during the
647 * divisor calculation).
649 KKASSERT(lapic_cputimer_intr.freq != 0 &&
650 lapic_timer_divisor_idx >= 0);
652 count = ((us * (int64_t)lapic_cputimer_intr.freq) + 999999) / 1000000;
653 lapic_timer_oneshot(count);
658 * Read remaining time in timer.
661 read_apic_timer(void)
664 /** XXX FIXME: we need to return the actual remaining time,
665 * for now we just return the remaining count.
668 return lapic->ccr_timer;
674 * Spin-style delay, set delay time in uS, spin till it drains.
679 set_apic_timer(count);
680 while (read_apic_timer())
685 lapic_unused_apic_id(int start)
689 for (i = start; i < NAPICID; ++i) {
690 if (APICID_TO_CPUID(i) == -1)
697 lapic_map(vm_offset_t lapic_addr)
699 lapic = pmap_mapdev_uncacheable(lapic_addr, sizeof(struct LAPIC));
701 kprintf("lapic: at 0x%08lx\n", lapic_addr);
704 static TAILQ_HEAD(, lapic_enumerator) lapic_enumerators =
705 TAILQ_HEAD_INITIALIZER(lapic_enumerators);
710 struct lapic_enumerator *e;
711 int error, i, enable, ap_max;
713 for (i = 0; i < NAPICID; ++i)
714 APICID_TO_CPUID(i) = -1;
717 TUNABLE_INT_FETCH("hw.lapic_enable", &enable);
719 kprintf("LAPIC: Warning LAPIC is disabled\n");
723 TAILQ_FOREACH(e, &lapic_enumerators, lapic_link) {
724 error = e->lapic_probe(e);
729 kprintf("LAPIC: Can't find LAPIC\n");
733 e->lapic_enumerate(e);
736 TUNABLE_INT_FETCH("hw.ap_max", &ap_max);
737 if (ap_max > MAXCPU - 1)
741 kprintf("LAPIC: Warning use only %d out of %d "
751 lapic_enumerator_register(struct lapic_enumerator *ne)
753 struct lapic_enumerator *e;
755 TAILQ_FOREACH(e, &lapic_enumerators, lapic_link) {
756 if (e->lapic_prio < ne->lapic_prio) {
757 TAILQ_INSERT_BEFORE(e, ne, lapic_link);
761 TAILQ_INSERT_TAIL(&lapic_enumerators, ne, lapic_link);
765 lapic_set_cpuid(int cpu_id, int apic_id)
767 CPUID_TO_APICID(cpu_id) = apic_id;
768 APICID_TO_CPUID(apic_id) = cpu_id;
772 lapic_fixup_noioapic(void)
776 /* Only allowed on BSP */
777 KKASSERT(mycpuid == 0);
778 KKASSERT(!ioapic_enable);
780 temp = lapic->lvt_lint0;
781 temp &= ~APIC_LVT_MASKED;
782 lapic->lvt_lint0 = temp;
784 temp = lapic->lvt_lint1;
785 temp |= APIC_LVT_MASKED;
786 lapic->lvt_lint1 = temp;