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/cputypes.h>
36 #include <machine/md_var.h>
37 #include <machine/pmap.h>
38 #include <machine_base/apic/lapic.h>
39 #include <machine_base/apic/ioapic.h>
40 #include <machine_base/apic/ioapic_abi.h>
41 #include <machine/segments.h>
42 #include <sys/thread2.h>
44 #include <machine/intr_machdep.h>
48 volatile lapic_t *lapic;
50 static void lapic_timer_calibrate(void);
51 static void lapic_timer_set_divisor(int);
52 static void lapic_timer_fixup_handler(void *);
53 static void lapic_timer_restart_handler(void *);
55 void lapic_timer_process(void);
56 void lapic_timer_process_frame(struct intrframe *);
58 static int lapic_timer_enable = 1;
59 TUNABLE_INT("hw.lapic_timer_enable", &lapic_timer_enable);
61 static void lapic_timer_intr_reload(struct cputimer_intr *, sysclock_t);
62 static void lapic_timer_intr_enable(struct cputimer_intr *);
63 static void lapic_timer_intr_restart(struct cputimer_intr *);
64 static void lapic_timer_intr_pmfixup(struct cputimer_intr *);
66 static struct cputimer_intr lapic_cputimer_intr = {
68 .reload = lapic_timer_intr_reload,
69 .enable = lapic_timer_intr_enable,
70 .config = cputimer_intr_default_config,
71 .restart = lapic_timer_intr_restart,
72 .pmfixup = lapic_timer_intr_pmfixup,
73 .initclock = cputimer_intr_default_initclock,
74 .next = SLIST_ENTRY_INITIALIZER,
76 .type = CPUTIMER_INTR_LAPIC,
77 .prio = CPUTIMER_INTR_PRIO_LAPIC,
78 .caps = CPUTIMER_INTR_CAP_NONE
81 static int lapic_timer_divisor_idx = -1;
82 static const uint32_t lapic_timer_divisors[] = {
83 APIC_TDCR_2, APIC_TDCR_4, APIC_TDCR_8, APIC_TDCR_16,
84 APIC_TDCR_32, APIC_TDCR_64, APIC_TDCR_128, APIC_TDCR_1
86 #define APIC_TIMER_NDIVISORS (int)(NELEM(lapic_timer_divisors))
89 * APIC ID <-> CPU ID mapping structures.
91 int cpu_id_to_apic_id[NAPICID];
92 int apic_id_to_cpu_id[NAPICID];
96 * Enable LAPIC, configure interrupts.
99 lapic_init(boolean_t bsp)
107 * Since IDT is shared between BSP and APs, these vectors
108 * only need to be installed once; we do it on BSP.
111 /* Install a 'Spurious INTerrupt' vector */
112 setidt(XSPURIOUSINT_OFFSET, Xspuriousint,
113 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
115 /* Install an inter-CPU IPI for TLB invalidation */
116 setidt(XINVLTLB_OFFSET, Xinvltlb,
117 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
119 /* Install an inter-CPU IPI for IPIQ messaging */
120 setidt(XIPIQ_OFFSET, Xipiq,
121 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
123 /* Install a timer vector */
124 setidt(XTIMER_OFFSET, Xtimer,
125 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
127 /* Install an inter-CPU IPI for CPU stop/restart */
128 setidt(XCPUSTOP_OFFSET, Xcpustop,
129 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
133 * Setup LINT0 as ExtINT on the BSP. This is theoretically an
134 * aggregate interrupt input from the 8259. The INTA cycle
135 * will be routed to the external controller (the 8259) which
136 * is expected to supply the vector.
138 * Must be setup edge triggered, active high.
140 * Disable LINT0 on BSP, if I/O APIC is enabled.
142 * Disable LINT0 on the APs. It doesn't matter what delivery
143 * mode we use because we leave it masked.
145 temp = lapic->lvt_lint0;
146 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
147 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
149 temp |= APIC_LVT_DM_EXTINT;
151 temp |= APIC_LVT_MASKED;
153 temp |= APIC_LVT_DM_FIXED | APIC_LVT_MASKED;
155 lapic->lvt_lint0 = temp;
158 * Setup LINT1 as NMI.
160 * Must be setup edge trigger, active high.
162 * Enable LINT1 on BSP, if I/O APIC is enabled.
164 * Disable LINT1 on the APs.
166 temp = lapic->lvt_lint1;
167 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
168 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
169 temp |= APIC_LVT_MASKED | APIC_LVT_DM_NMI;
170 if (bsp && ioapic_enable)
171 temp &= ~APIC_LVT_MASKED;
172 lapic->lvt_lint1 = temp;
175 * Mask the LAPIC error interrupt, LAPIC performance counter
178 lapic->lvt_error = lapic->lvt_error | APIC_LVT_MASKED;
179 lapic->lvt_pcint = lapic->lvt_pcint | APIC_LVT_MASKED;
182 * Set LAPIC timer vector and mask the LAPIC timer interrupt.
184 timer = lapic->lvt_timer;
185 timer &= ~APIC_LVTT_VECTOR;
186 timer |= XTIMER_OFFSET;
187 timer |= APIC_LVTT_MASKED;
188 lapic->lvt_timer = timer;
191 * Set the Task Priority Register as needed. At the moment allow
192 * interrupts on all cpus (the APs will remain CLId until they are
196 temp &= ~APIC_TPR_PRIO; /* clear priority field */
203 temp |= APIC_SVR_ENABLE; /* enable the LAPIC */
204 temp &= ~APIC_SVR_FOCUS_DISABLE; /* enable lopri focus processor */
207 * Set the spurious interrupt vector. The low 4 bits of the vector
210 if ((XSPURIOUSINT_OFFSET & 0x0F) != 0x0F)
211 panic("bad XSPURIOUSINT_OFFSET: 0x%08x", XSPURIOUSINT_OFFSET);
212 temp &= ~APIC_SVR_VECTOR;
213 temp |= XSPURIOUSINT_OFFSET;
218 * Pump out a few EOIs to clean out interrupts that got through
219 * before we were able to set the TPR.
226 lapic_timer_calibrate();
227 if (lapic_timer_enable) {
228 cputimer_intr_register(&lapic_cputimer_intr);
229 cputimer_intr_select(&lapic_cputimer_intr, 0);
232 lapic_timer_set_divisor(lapic_timer_divisor_idx);
236 apic_dump("apic_initialize()");
240 lapic_timer_set_divisor(int divisor_idx)
242 KKASSERT(divisor_idx >= 0 && divisor_idx < APIC_TIMER_NDIVISORS);
243 lapic->dcr_timer = lapic_timer_divisors[divisor_idx];
247 lapic_timer_oneshot(u_int count)
251 value = lapic->lvt_timer;
252 value &= ~APIC_LVTT_PERIODIC;
253 lapic->lvt_timer = value;
254 lapic->icr_timer = count;
258 lapic_timer_oneshot_quick(u_int count)
260 lapic->icr_timer = count;
264 lapic_timer_calibrate(void)
268 /* Try to calibrate the local APIC timer. */
269 for (lapic_timer_divisor_idx = 0;
270 lapic_timer_divisor_idx < APIC_TIMER_NDIVISORS;
271 lapic_timer_divisor_idx++) {
272 lapic_timer_set_divisor(lapic_timer_divisor_idx);
273 lapic_timer_oneshot(APIC_TIMER_MAX_COUNT);
275 value = APIC_TIMER_MAX_COUNT - lapic->ccr_timer;
276 if (value != APIC_TIMER_MAX_COUNT)
279 if (lapic_timer_divisor_idx >= APIC_TIMER_NDIVISORS)
280 panic("lapic: no proper timer divisor?!\n");
281 lapic_cputimer_intr.freq = value / 2;
283 kprintf("lapic: divisor index %d, frequency %u Hz\n",
284 lapic_timer_divisor_idx, lapic_cputimer_intr.freq);
288 lapic_timer_process_oncpu(struct globaldata *gd, struct intrframe *frame)
292 gd->gd_timer_running = 0;
294 count = sys_cputimer->count();
295 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
296 systimer_intr(&count, 0, frame);
300 lapic_timer_process(void)
302 lapic_timer_process_oncpu(mycpu, NULL);
306 lapic_timer_process_frame(struct intrframe *frame)
308 lapic_timer_process_oncpu(mycpu, frame);
312 lapic_timer_intr_reload(struct cputimer_intr *cti, sysclock_t reload)
314 struct globaldata *gd = mycpu;
316 reload = (int64_t)reload * cti->freq / sys_cputimer->freq;
320 if (gd->gd_timer_running) {
321 if (reload < lapic->ccr_timer)
322 lapic_timer_oneshot_quick(reload);
324 gd->gd_timer_running = 1;
325 lapic_timer_oneshot_quick(reload);
330 lapic_timer_intr_enable(struct cputimer_intr *cti __unused)
334 timer = lapic->lvt_timer;
335 timer &= ~(APIC_LVTT_MASKED | APIC_LVTT_PERIODIC);
336 lapic->lvt_timer = timer;
338 lapic_timer_fixup_handler(NULL);
342 lapic_timer_fixup_handler(void *arg)
349 if (cpu_vendor_id == CPU_VENDOR_AMD) {
351 * Detect the presence of C1E capability mostly on latest
352 * dual-cores (or future) k8 family. This feature renders
353 * the local APIC timer dead, so we disable it by reading
354 * the Interrupt Pending Message register and clearing both
355 * C1eOnCmpHalt (bit 28) and SmiOnCmpHalt (bit 27).
358 * "BIOS and Kernel Developer's Guide for AMD NPT
359 * Family 0Fh Processors"
360 * #32559 revision 3.00
362 if ((cpu_id & 0x00000f00) == 0x00000f00 &&
363 (cpu_id & 0x0fff0000) >= 0x00040000) {
366 msr = rdmsr(0xc0010055);
367 if (msr & 0x18000000) {
368 struct globaldata *gd = mycpu;
370 kprintf("cpu%d: AMD C1E detected\n",
372 wrmsr(0xc0010055, msr & ~0x18000000ULL);
375 * We are kinda stalled;
378 gd->gd_timer_running = 1;
379 lapic_timer_oneshot_quick(2);
389 lapic_timer_restart_handler(void *dummy __unused)
393 lapic_timer_fixup_handler(&started);
395 struct globaldata *gd = mycpu;
397 gd->gd_timer_running = 1;
398 lapic_timer_oneshot_quick(2);
403 * This function is called only by ACPI-CA code currently:
404 * - AMD C1E fixup. AMD C1E only seems to happen after ACPI
405 * module controls PM. So once ACPI-CA is attached, we try
406 * to apply the fixup to prevent LAPIC timer from hanging.
409 lapic_timer_intr_pmfixup(struct cputimer_intr *cti __unused)
411 lwkt_send_ipiq_mask(smp_active_mask,
412 lapic_timer_fixup_handler, NULL);
416 lapic_timer_intr_restart(struct cputimer_intr *cti __unused)
418 lwkt_send_ipiq_mask(smp_active_mask, lapic_timer_restart_handler, NULL);
423 * dump contents of local APIC registers
428 kprintf("SMP: CPU%d %s:\n", mycpu->gd_cpuid, str);
429 kprintf(" lint0: 0x%08x lint1: 0x%08x TPR: 0x%08x SVR: 0x%08x\n",
430 lapic->lvt_lint0, lapic->lvt_lint1, lapic->tpr, lapic->svr);
434 * Inter Processor Interrupt functions.
438 * Send APIC IPI 'vector' to 'destType' via 'deliveryMode'.
440 * destType is 1 of: APIC_DEST_SELF, APIC_DEST_ALLISELF, APIC_DEST_ALLESELF
441 * vector is any valid SYSTEM INT vector
442 * delivery_mode is 1 of: APIC_DELMODE_FIXED, APIC_DELMODE_LOWPRIO
444 * A backlog of requests can create a deadlock between cpus. To avoid this
445 * we have to be able to accept IPIs at the same time we are trying to send
446 * them. The critical section prevents us from attempting to send additional
447 * IPIs reentrantly, but also prevents IPIQ processing so we have to call
448 * lwkt_process_ipiq() manually. It's rather messy and expensive for this
449 * to occur but fortunately it does not happen too often.
452 apic_ipi(int dest_type, int vector, int delivery_mode)
457 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
458 unsigned int eflags = read_eflags();
460 DEBUG_PUSH_INFO("apic_ipi");
461 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
465 write_eflags(eflags);
468 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK) | dest_type |
469 delivery_mode | vector;
470 lapic->icr_lo = icr_lo;
476 single_apic_ipi(int cpu, int vector, int delivery_mode)
482 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
483 unsigned int eflags = read_eflags();
485 DEBUG_PUSH_INFO("single_apic_ipi");
486 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
490 write_eflags(eflags);
492 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
493 icr_hi |= (CPUID_TO_APICID(cpu) << 24);
494 lapic->icr_hi = icr_hi;
497 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK)
498 | APIC_DEST_DESTFLD | delivery_mode | vector;
501 lapic->icr_lo = icr_lo;
508 * Returns 0 if the apic is busy, 1 if we were able to queue the request.
510 * NOT WORKING YET! The code as-is may end up not queueing an IPI at all
511 * to the target, and the scheduler does not 'poll' for IPI messages.
514 single_apic_ipi_passive(int cpu, int vector, int delivery_mode)
520 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
524 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
525 icr_hi |= (CPUID_TO_APICID(cpu) << 24);
526 lapic->icr_hi = icr_hi;
529 icr_lo = (lapic->icr_lo & APIC_RESV2_MASK)
530 | APIC_DEST_DESTFLD | delivery_mode | vector;
533 lapic->icr_lo = icr_lo;
541 * Send APIC IPI 'vector' to 'target's via 'delivery_mode'.
543 * target is a bitmask of destination cpus. Vector is any
544 * valid system INT vector. Delivery mode may be either
545 * APIC_DELMODE_FIXED or APIC_DELMODE_LOWPRIO.
548 selected_apic_ipi(cpumask_t target, int vector, int delivery_mode)
552 int n = BSFCPUMASK(target);
553 target &= ~CPUMASK(n);
554 single_apic_ipi(n, vector, delivery_mode);
560 * Timer code, in development...
561 * - suggested by rgrimes@gndrsh.aac.dev.com
564 get_apic_timer_frequency(void)
566 return(lapic_cputimer_intr.freq);
570 * Load a 'downcount time' in uSeconds.
573 set_apic_timer(int us)
578 * When we reach here, lapic timer's frequency
579 * must have been calculated as well as the
580 * divisor (lapic.dcr_timer is setup during the
581 * divisor calculation).
583 KKASSERT(lapic_cputimer_intr.freq != 0 &&
584 lapic_timer_divisor_idx >= 0);
586 count = ((us * (int64_t)lapic_cputimer_intr.freq) + 999999) / 1000000;
587 lapic_timer_oneshot(count);
592 * Read remaining time in timer.
595 read_apic_timer(void)
598 /** XXX FIXME: we need to return the actual remaining time,
599 * for now we just return the remaining count.
602 return lapic->ccr_timer;
608 * Spin-style delay, set delay time in uS, spin till it drains.
613 set_apic_timer(count);
614 while (read_apic_timer())
619 lapic_unused_apic_id(int start)
623 for (i = start; i < NAPICID; ++i) {
624 if (APICID_TO_CPUID(i) == -1)
631 lapic_map(vm_offset_t lapic_addr)
633 lapic = pmap_mapdev_uncacheable(lapic_addr, sizeof(struct LAPIC));
635 kprintf("lapic: at %p\n", (void *)lapic_addr);
638 static TAILQ_HEAD(, lapic_enumerator) lapic_enumerators =
639 TAILQ_HEAD_INITIALIZER(lapic_enumerators);
644 struct lapic_enumerator *e;
645 int error, i, ap_max;
647 KKASSERT(lapic_enable);
649 for (i = 0; i < NAPICID; ++i)
650 APICID_TO_CPUID(i) = -1;
652 TAILQ_FOREACH(e, &lapic_enumerators, lapic_link) {
653 error = e->lapic_probe(e);
658 kprintf("LAPIC: Can't find LAPIC\n");
662 e->lapic_enumerate(e);
665 TUNABLE_INT_FETCH("hw.ap_max", &ap_max);
666 if (ap_max > MAXCPU - 1)
670 kprintf("LAPIC: Warning use only %d out of %d "
671 "available APs\n", ap_max, naps);
679 lapic_enumerator_register(struct lapic_enumerator *ne)
681 struct lapic_enumerator *e;
683 TAILQ_FOREACH(e, &lapic_enumerators, lapic_link) {
684 if (e->lapic_prio < ne->lapic_prio) {
685 TAILQ_INSERT_BEFORE(e, ne, lapic_link);
689 TAILQ_INSERT_TAIL(&lapic_enumerators, ne, lapic_link);
693 lapic_set_cpuid(int cpu_id, int apic_id)
695 CPUID_TO_APICID(cpu_id) = apic_id;
696 APICID_TO_CPUID(apic_id) = cpu_id;
700 lapic_fixup_noioapic(void)
704 /* Only allowed on BSP */
705 KKASSERT(mycpuid == 0);
706 KKASSERT(!ioapic_enable);
708 temp = lapic->lvt_lint0;
709 temp &= ~APIC_LVT_MASKED;
710 lapic->lvt_lint0 = temp;
712 temp = lapic->lvt_lint1;
713 temp |= APIC_LVT_MASKED;
714 lapic->lvt_lint1 = temp;