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_abi.h>
39 #include <machine/segments.h>
40 #include <sys/thread2.h>
42 #include <machine/intr_machdep.h>
46 volatile lapic_t *lapic;
48 static void lapic_timer_calibrate(void);
49 static void lapic_timer_set_divisor(int);
50 static void lapic_timer_fixup_handler(void *);
51 static void lapic_timer_restart_handler(void *);
53 void lapic_timer_process(void);
54 void lapic_timer_process_frame(struct intrframe *);
55 void lapic_timer_always(struct intrframe *);
57 static int lapic_timer_enable = 1;
58 TUNABLE_INT("hw.lapic_timer_enable", &lapic_timer_enable);
60 static void lapic_timer_intr_reload(struct cputimer_intr *, sysclock_t);
61 static void lapic_timer_intr_enable(struct cputimer_intr *);
62 static void lapic_timer_intr_restart(struct cputimer_intr *);
63 static void lapic_timer_intr_pmfixup(struct cputimer_intr *);
65 static struct cputimer_intr lapic_cputimer_intr = {
67 .reload = lapic_timer_intr_reload,
68 .enable = lapic_timer_intr_enable,
69 .config = cputimer_intr_default_config,
70 .restart = lapic_timer_intr_restart,
71 .pmfixup = lapic_timer_intr_pmfixup,
72 .initclock = cputimer_intr_default_initclock,
73 .next = SLIST_ENTRY_INITIALIZER,
75 .type = CPUTIMER_INTR_LAPIC,
76 .prio = CPUTIMER_INTR_PRIO_LAPIC,
77 .caps = CPUTIMER_INTR_CAP_NONE
80 static int lapic_timer_divisor_idx = -1;
81 static const uint32_t lapic_timer_divisors[] = {
82 APIC_TDCR_2, APIC_TDCR_4, APIC_TDCR_8, APIC_TDCR_16,
83 APIC_TDCR_32, APIC_TDCR_64, APIC_TDCR_128, APIC_TDCR_1
85 #define APIC_TIMER_NDIVISORS (int)(NELEM(lapic_timer_divisors))
88 * APIC ID logical/physical mapping structures.
89 * We oversize these to simplify boot-time config.
91 int cpu_num_to_apic_id[NAPICID];
92 int apic_id_to_logical[NAPICID];
102 * Enable LAPIC, configure interrupts.
105 lapic_init(boolean_t bsp)
113 * Since IDT is shared between BSP and APs, these vectors
114 * only need to be installed once; we do it on BSP.
117 /* Install a 'Spurious INTerrupt' vector */
118 setidt(XSPURIOUSINT_OFFSET, Xspuriousint,
119 SDT_SYSIGT, SEL_KPL, 0);
121 /* Install an inter-CPU IPI for TLB invalidation */
122 setidt(XINVLTLB_OFFSET, Xinvltlb,
123 SDT_SYSIGT, SEL_KPL, 0);
125 /* Install an inter-CPU IPI for IPIQ messaging */
126 setidt(XIPIQ_OFFSET, Xipiq,
127 SDT_SYSIGT, SEL_KPL, 0);
129 /* Install a timer vector */
130 setidt(XTIMER_OFFSET, Xtimer,
131 SDT_SYSIGT, SEL_KPL, 0);
133 /* Install an inter-CPU IPI for CPU stop/restart */
134 setidt(XCPUSTOP_OFFSET, Xcpustop,
135 SDT_SYSIGT, SEL_KPL, 0);
139 * Setup LINT0 as ExtINT on the BSP. This is theoretically an
140 * aggregate interrupt input from the 8259. The INTA cycle
141 * will be routed to the external controller (the 8259) which
142 * is expected to supply the vector.
144 * Must be setup edge triggered, active high.
146 * Disable LINT0 on BSP, if I/O APIC is enabled.
148 * Disable LINT0 on the APs. It doesn't matter what delivery
149 * mode we use because we leave it masked.
151 temp = lapic->lvt_lint0;
152 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
153 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
155 temp |= APIC_LVT_DM_EXTINT;
157 temp |= APIC_LVT_MASKED;
159 temp |= APIC_LVT_DM_FIXED | APIC_LVT_MASKED;
161 lapic->lvt_lint0 = temp;
164 * Setup LINT1 as NMI.
166 * Must be setup edge trigger, active high.
168 * Enable LINT1 on BSP, if I/O APIC is enabled.
170 * Disable LINT1 on the APs.
172 temp = lapic->lvt_lint1;
173 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
174 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
175 temp |= APIC_LVT_MASKED | APIC_LVT_DM_NMI;
176 if (bsp && apic_io_enable)
177 temp &= ~APIC_LVT_MASKED;
178 lapic->lvt_lint1 = temp;
181 * Mask the LAPIC error interrupt, LAPIC performance counter
184 lapic->lvt_error = lapic->lvt_error | APIC_LVT_MASKED;
185 lapic->lvt_pcint = lapic->lvt_pcint | APIC_LVT_MASKED;
188 * Set LAPIC timer vector and mask the LAPIC timer interrupt.
190 timer = lapic->lvt_timer;
191 timer &= ~APIC_LVTT_VECTOR;
192 timer |= XTIMER_OFFSET;
193 timer |= APIC_LVTT_MASKED;
194 lapic->lvt_timer = timer;
197 * Set the Task Priority Register as needed. At the moment allow
198 * interrupts on all cpus (the APs will remain CLId until they are
199 * ready to deal). We could disable all but IPIs by setting
200 * temp |= TPR_IPI for cpu != 0.
203 temp &= ~APIC_TPR_PRIO; /* clear priority field */
204 #ifdef SMP /* APIC-IO */
205 if (!apic_io_enable) {
208 * If we are NOT running the IO APICs, the LAPIC will only be used
209 * for IPIs. Set the TPR to prevent any unintentional interrupts.
212 #ifdef SMP /* APIC-IO */
221 temp |= APIC_SVR_ENABLE; /* enable the LAPIC */
222 temp &= ~APIC_SVR_FOCUS_DISABLE; /* enable lopri focus processor */
225 * Set the spurious interrupt vector. The low 4 bits of the vector
228 if ((XSPURIOUSINT_OFFSET & 0x0F) != 0x0F)
229 panic("bad XSPURIOUSINT_OFFSET: 0x%08x", XSPURIOUSINT_OFFSET);
230 temp &= ~APIC_SVR_VECTOR;
231 temp |= XSPURIOUSINT_OFFSET;
236 * Pump out a few EOIs to clean out interrupts that got through
237 * before we were able to set the TPR.
244 lapic_timer_calibrate();
245 if (lapic_timer_enable) {
246 cputimer_intr_register(&lapic_cputimer_intr);
247 cputimer_intr_select(&lapic_cputimer_intr, 0);
250 lapic_timer_set_divisor(lapic_timer_divisor_idx);
254 apic_dump("apic_initialize()");
258 lapic_timer_set_divisor(int divisor_idx)
260 KKASSERT(divisor_idx >= 0 && divisor_idx < APIC_TIMER_NDIVISORS);
261 lapic->dcr_timer = lapic_timer_divisors[divisor_idx];
265 lapic_timer_oneshot(u_int count)
269 value = lapic->lvt_timer;
270 value &= ~APIC_LVTT_PERIODIC;
271 lapic->lvt_timer = value;
272 lapic->icr_timer = count;
276 lapic_timer_oneshot_quick(u_int count)
278 lapic->icr_timer = count;
282 lapic_timer_calibrate(void)
286 /* Try to calibrate the local APIC timer. */
287 for (lapic_timer_divisor_idx = 0;
288 lapic_timer_divisor_idx < APIC_TIMER_NDIVISORS;
289 lapic_timer_divisor_idx++) {
290 lapic_timer_set_divisor(lapic_timer_divisor_idx);
291 lapic_timer_oneshot(APIC_TIMER_MAX_COUNT);
293 value = APIC_TIMER_MAX_COUNT - lapic->ccr_timer;
294 if (value != APIC_TIMER_MAX_COUNT)
297 if (lapic_timer_divisor_idx >= APIC_TIMER_NDIVISORS)
298 panic("lapic: no proper timer divisor?!\n");
299 lapic_cputimer_intr.freq = value / 2;
301 kprintf("lapic: divisor index %d, frequency %u Hz\n",
302 lapic_timer_divisor_idx, lapic_cputimer_intr.freq);
306 lapic_timer_process_oncpu(struct globaldata *gd, struct intrframe *frame)
310 gd->gd_timer_running = 0;
312 count = sys_cputimer->count();
313 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
314 systimer_intr(&count, 0, frame);
318 lapic_timer_process(void)
320 lapic_timer_process_oncpu(mycpu, NULL);
324 lapic_timer_process_frame(struct intrframe *frame)
326 lapic_timer_process_oncpu(mycpu, frame);
330 * This manual debugging code is called unconditionally from Xtimer
331 * (the lapic timer interrupt) whether the current thread is in a
332 * critical section or not) and can be useful in tracking down lockups.
334 * NOTE: MANUAL DEBUG CODE
337 static int saveticks[SMP_MAXCPU];
338 static int savecounts[SMP_MAXCPU];
342 lapic_timer_always(struct intrframe *frame)
345 globaldata_t gd = mycpu;
346 int cpu = gd->gd_cpuid;
352 gptr = (short *)0xFFFFFFFF800b8000 + 80 * cpu;
353 *gptr = ((*gptr + 1) & 0x00FF) | 0x0700;
356 ksnprintf(buf, sizeof(buf), " %p %16s %d %16s ",
357 (void *)frame->if_rip, gd->gd_curthread->td_comm, ticks,
359 for (i = 0; buf[i]; ++i) {
360 gptr[i] = 0x0700 | (unsigned char)buf[i];
364 if (saveticks[gd->gd_cpuid] != ticks) {
365 saveticks[gd->gd_cpuid] = ticks;
366 savecounts[gd->gd_cpuid] = 0;
368 ++savecounts[gd->gd_cpuid];
369 if (savecounts[gd->gd_cpuid] > 2000 && panicstr == NULL) {
370 panic("cpud %d panicing on ticks failure",
373 for (i = 0; i < ncpus; ++i) {
375 if (saveticks[i] && panicstr == NULL) {
376 delta = saveticks[i] - ticks;
377 if (delta < -10 || delta > 10) {
378 panic("cpu %d panicing on cpu %d watchdog",
388 lapic_timer_intr_reload(struct cputimer_intr *cti, sysclock_t reload)
390 struct globaldata *gd = mycpu;
392 reload = (int64_t)reload * cti->freq / sys_cputimer->freq;
396 if (gd->gd_timer_running) {
397 if (reload < lapic->ccr_timer)
398 lapic_timer_oneshot_quick(reload);
400 gd->gd_timer_running = 1;
401 lapic_timer_oneshot_quick(reload);
406 lapic_timer_intr_enable(struct cputimer_intr *cti __unused)
410 timer = lapic->lvt_timer;
411 timer &= ~(APIC_LVTT_MASKED | APIC_LVTT_PERIODIC);
412 lapic->lvt_timer = timer;
414 lapic_timer_fixup_handler(NULL);
418 lapic_timer_fixup_handler(void *arg)
425 if (strcmp(cpu_vendor, "AuthenticAMD") == 0) {
427 * Detect the presence of C1E capability mostly on latest
428 * dual-cores (or future) k8 family. This feature renders
429 * the local APIC timer dead, so we disable it by reading
430 * the Interrupt Pending Message register and clearing both
431 * C1eOnCmpHalt (bit 28) and SmiOnCmpHalt (bit 27).
434 * "BIOS and Kernel Developer's Guide for AMD NPT
435 * Family 0Fh Processors"
436 * #32559 revision 3.00
438 if ((cpu_id & 0x00000f00) == 0x00000f00 &&
439 (cpu_id & 0x0fff0000) >= 0x00040000) {
442 msr = rdmsr(0xc0010055);
443 if (msr & 0x18000000) {
444 struct globaldata *gd = mycpu;
446 kprintf("cpu%d: AMD C1E detected\n",
448 wrmsr(0xc0010055, msr & ~0x18000000ULL);
451 * We are kinda stalled;
454 gd->gd_timer_running = 1;
455 lapic_timer_oneshot_quick(2);
465 lapic_timer_restart_handler(void *dummy __unused)
469 lapic_timer_fixup_handler(&started);
471 struct globaldata *gd = mycpu;
473 gd->gd_timer_running = 1;
474 lapic_timer_oneshot_quick(2);
479 * This function is called only by ACPI-CA code currently:
480 * - AMD C1E fixup. AMD C1E only seems to happen after ACPI
481 * module controls PM. So once ACPI-CA is attached, we try
482 * to apply the fixup to prevent LAPIC timer from hanging.
485 lapic_timer_intr_pmfixup(struct cputimer_intr *cti __unused)
487 lwkt_send_ipiq_mask(smp_active_mask,
488 lapic_timer_fixup_handler, NULL);
492 lapic_timer_intr_restart(struct cputimer_intr *cti __unused)
494 lwkt_send_ipiq_mask(smp_active_mask, lapic_timer_restart_handler, NULL);
499 * dump contents of local APIC registers
504 kprintf("SMP: CPU%d %s:\n", mycpu->gd_cpuid, str);
505 kprintf(" lint0: 0x%08x lint1: 0x%08x TPR: 0x%08x SVR: 0x%08x\n",
506 lapic->lvt_lint0, lapic->lvt_lint1, lapic->tpr, lapic->svr);
510 * Inter Processor Interrupt functions.
514 * Send APIC IPI 'vector' to 'destType' via 'deliveryMode'.
516 * destType is 1 of: APIC_DEST_SELF, APIC_DEST_ALLISELF, APIC_DEST_ALLESELF
517 * vector is any valid SYSTEM INT vector
518 * delivery_mode is 1 of: APIC_DELMODE_FIXED, APIC_DELMODE_LOWPRIO
520 * A backlog of requests can create a deadlock between cpus. To avoid this
521 * we have to be able to accept IPIs at the same time we are trying to send
522 * them. The critical section prevents us from attempting to send additional
523 * IPIs reentrantly, but also prevents IPIQ processing so we have to call
524 * lwkt_process_ipiq() manually. It's rather messy and expensive for this
525 * to occur but fortunately it does not happen too often.
528 apic_ipi(int dest_type, int vector, int delivery_mode)
533 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
534 unsigned long rflags = read_rflags();
536 DEBUG_PUSH_INFO("apic_ipi");
537 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
541 write_rflags(rflags);
544 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK) | dest_type |
545 delivery_mode | vector;
546 lapic->icr_lo = icr_lo;
552 single_apic_ipi(int cpu, int vector, int delivery_mode)
558 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
559 unsigned long rflags = read_rflags();
561 DEBUG_PUSH_INFO("single_apic_ipi");
562 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
566 write_rflags(rflags);
568 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
569 icr_hi |= (CPU_TO_ID(cpu) << 24);
570 lapic->icr_hi = icr_hi;
573 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK)
574 | APIC_DEST_DESTFLD | delivery_mode | vector;
577 lapic->icr_lo = icr_lo;
584 * Returns 0 if the apic is busy, 1 if we were able to queue the request.
586 * NOT WORKING YET! The code as-is may end up not queueing an IPI at all
587 * to the target, and the scheduler does not 'poll' for IPI messages.
590 single_apic_ipi_passive(int cpu, int vector, int delivery_mode)
596 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
600 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
601 icr_hi |= (CPU_TO_ID(cpu) << 24);
602 lapic->icr_hi = icr_hi;
605 icr_lo = (lapic->icr_lo & APIC_RESV2_MASK)
606 | APIC_DEST_DESTFLD | delivery_mode | vector;
609 lapic->icr_lo = icr_lo;
617 * Send APIC IPI 'vector' to 'target's via 'delivery_mode'.
619 * target is a bitmask of destination cpus. Vector is any
620 * valid system INT vector. Delivery mode may be either
621 * APIC_DELMODE_FIXED or APIC_DELMODE_LOWPRIO.
624 selected_apic_ipi(cpumask_t target, int vector, int delivery_mode)
628 int n = BSFCPUMASK(target);
629 target &= ~CPUMASK(n);
630 single_apic_ipi(n, vector, delivery_mode);
636 * Timer code, in development...
637 * - suggested by rgrimes@gndrsh.aac.dev.com
640 get_apic_timer_frequency(void)
642 return(lapic_cputimer_intr.freq);
646 * Load a 'downcount time' in uSeconds.
649 set_apic_timer(int us)
654 * When we reach here, lapic timer's frequency
655 * must have been calculated as well as the
656 * divisor (lapic->dcr_timer is setup during the
657 * divisor calculation).
659 KKASSERT(lapic_cputimer_intr.freq != 0 &&
660 lapic_timer_divisor_idx >= 0);
662 count = ((us * (int64_t)lapic_cputimer_intr.freq) + 999999) / 1000000;
663 lapic_timer_oneshot(count);
668 * Read remaining time in timer.
671 read_apic_timer(void)
674 /** XXX FIXME: we need to return the actual remaining time,
675 * for now we just return the remaining count.
678 return lapic->ccr_timer;
684 * Spin-style delay, set delay time in uS, spin till it drains.
689 set_apic_timer(count);
690 while (read_apic_timer())
695 lapic_unused_apic_id(int start)
699 for (i = start; i < NAPICID; ++i) {
700 if (ID_TO_CPU(i) == -1)
707 lapic_map(vm_offset_t lapic_addr)
709 lapic = pmap_mapdev_uncacheable(lapic_addr, sizeof(struct LAPIC));
711 kprintf("lapic: at 0x%08lx\n", lapic_addr);
714 static TAILQ_HEAD(, lapic_enumerator) lapic_enumerators =
715 TAILQ_HEAD_INITIALIZER(lapic_enumerators);
720 struct lapic_enumerator *e;
723 for (i = 0; i < NAPICID; ++i)
726 TAILQ_FOREACH(e, &lapic_enumerators, lapic_link) {
727 error = e->lapic_probe(e);
732 panic("can't config lapic\n");
734 e->lapic_enumerate(e);
738 lapic_enumerator_register(struct lapic_enumerator *ne)
740 struct lapic_enumerator *e;
742 TAILQ_FOREACH(e, &lapic_enumerators, lapic_link) {
743 if (e->lapic_prio < ne->lapic_prio) {
744 TAILQ_INSERT_BEFORE(e, ne, lapic_link);
748 TAILQ_INSERT_TAIL(&lapic_enumerators, ne, lapic_link);
752 lapic_set_cpuid(int cpu_id, int apic_id)
754 CPU_TO_ID(cpu_id) = apic_id;
755 ID_TO_CPU(apic_id) = cpu_id;