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_base/icu/icu_var.h>
42 #include <machine/segments.h>
43 #include <sys/thread2.h>
45 #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 *);
59 static int lapic_timer_enable = 1;
60 TUNABLE_INT("hw.lapic_timer_enable", &lapic_timer_enable);
62 static void lapic_timer_intr_reload(struct cputimer_intr *, sysclock_t);
63 static void lapic_timer_intr_enable(struct cputimer_intr *);
64 static void lapic_timer_intr_restart(struct cputimer_intr *);
65 static void lapic_timer_intr_pmfixup(struct cputimer_intr *);
67 static struct cputimer_intr lapic_cputimer_intr = {
69 .reload = lapic_timer_intr_reload,
70 .enable = lapic_timer_intr_enable,
71 .config = cputimer_intr_default_config,
72 .restart = lapic_timer_intr_restart,
73 .pmfixup = lapic_timer_intr_pmfixup,
74 .initclock = cputimer_intr_default_initclock,
75 .next = SLIST_ENTRY_INITIALIZER,
77 .type = CPUTIMER_INTR_LAPIC,
78 .prio = CPUTIMER_INTR_PRIO_LAPIC,
79 .caps = CPUTIMER_INTR_CAP_NONE
82 static int lapic_timer_divisor_idx = -1;
83 static const uint32_t lapic_timer_divisors[] = {
84 APIC_TDCR_2, APIC_TDCR_4, APIC_TDCR_8, APIC_TDCR_16,
85 APIC_TDCR_32, APIC_TDCR_64, APIC_TDCR_128, APIC_TDCR_1
87 #define APIC_TIMER_NDIVISORS (int)(NELEM(lapic_timer_divisors))
90 * APIC ID <-> CPU ID mapping structures.
92 int cpu_id_to_apic_id[NAPICID];
93 int apic_id_to_cpu_id[NAPICID];
97 * Enable LAPIC, configure interrupts.
100 lapic_init(boolean_t bsp)
108 * Since IDT is shared between BSP and APs, these vectors
109 * only need to be installed once; we do it on BSP.
112 /* Install a 'Spurious INTerrupt' vector */
113 setidt(XSPURIOUSINT_OFFSET, Xspuriousint,
114 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
116 /* Install an inter-CPU IPI for TLB invalidation */
117 setidt(XINVLTLB_OFFSET, Xinvltlb,
118 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
120 /* Install an inter-CPU IPI for IPIQ messaging */
121 setidt(XIPIQ_OFFSET, Xipiq,
122 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
124 /* Install a timer vector */
125 setidt(XTIMER_OFFSET, Xtimer,
126 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
128 /* Install an inter-CPU IPI for CPU stop/restart */
129 setidt(XCPUSTOP_OFFSET, Xcpustop,
130 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
134 * Setup LINT0 as ExtINT on the BSP. This is theoretically an
135 * aggregate interrupt input from the 8259. The INTA cycle
136 * will be routed to the external controller (the 8259) which
137 * is expected to supply the vector.
139 * Must be setup edge triggered, active high.
141 * Disable LINT0 on BSP, if I/O APIC is enabled.
143 * Disable LINT0 on the APs. It doesn't matter what delivery
144 * mode we use because we leave it masked.
146 temp = lapic->lvt_lint0;
147 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
148 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
150 temp |= APIC_LVT_DM_EXTINT;
152 temp |= APIC_LVT_MASKED;
154 temp |= APIC_LVT_DM_FIXED | APIC_LVT_MASKED;
156 lapic->lvt_lint0 = temp;
159 * Setup LINT1 as NMI.
161 * Must be setup edge trigger, active high.
163 * Enable LINT1 on BSP, if I/O APIC is enabled.
165 * Disable LINT1 on the APs.
167 temp = lapic->lvt_lint1;
168 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
169 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
170 temp |= APIC_LVT_MASKED | APIC_LVT_DM_NMI;
171 if (bsp && ioapic_enable)
172 temp &= ~APIC_LVT_MASKED;
173 lapic->lvt_lint1 = temp;
176 * Mask the LAPIC error interrupt, LAPIC performance counter
179 lapic->lvt_error = lapic->lvt_error | APIC_LVT_MASKED;
180 lapic->lvt_pcint = lapic->lvt_pcint | APIC_LVT_MASKED;
183 * Set LAPIC timer vector and mask the LAPIC timer interrupt.
185 timer = lapic->lvt_timer;
186 timer &= ~APIC_LVTT_VECTOR;
187 timer |= XTIMER_OFFSET;
188 timer |= APIC_LVTT_MASKED;
189 lapic->lvt_timer = timer;
192 * Set the Task Priority Register as needed. At the moment allow
193 * interrupts on all cpus (the APs will remain CLId until they are
197 temp &= ~APIC_TPR_PRIO; /* clear priority field */
204 temp |= APIC_SVR_ENABLE; /* enable the LAPIC */
205 temp &= ~APIC_SVR_FOCUS_DISABLE; /* enable lopri focus processor */
208 * Set the spurious interrupt vector. The low 4 bits of the vector
211 if ((XSPURIOUSINT_OFFSET & 0x0F) != 0x0F)
212 panic("bad XSPURIOUSINT_OFFSET: 0x%08x", XSPURIOUSINT_OFFSET);
213 temp &= ~APIC_SVR_VECTOR;
214 temp |= XSPURIOUSINT_OFFSET;
219 * Pump out a few EOIs to clean out interrupts that got through
220 * before we were able to set the TPR.
227 lapic_timer_calibrate();
228 if (lapic_timer_enable) {
229 cputimer_intr_register(&lapic_cputimer_intr);
230 cputimer_intr_select(&lapic_cputimer_intr, 0);
233 lapic_timer_set_divisor(lapic_timer_divisor_idx);
237 apic_dump("apic_initialize()");
241 lapic_timer_set_divisor(int divisor_idx)
243 KKASSERT(divisor_idx >= 0 && divisor_idx < APIC_TIMER_NDIVISORS);
244 lapic->dcr_timer = lapic_timer_divisors[divisor_idx];
248 lapic_timer_oneshot(u_int count)
252 value = lapic->lvt_timer;
253 value &= ~APIC_LVTT_PERIODIC;
254 lapic->lvt_timer = value;
255 lapic->icr_timer = count;
259 lapic_timer_oneshot_quick(u_int count)
261 lapic->icr_timer = count;
265 lapic_timer_calibrate(void)
269 /* Try to calibrate the local APIC timer. */
270 for (lapic_timer_divisor_idx = 0;
271 lapic_timer_divisor_idx < APIC_TIMER_NDIVISORS;
272 lapic_timer_divisor_idx++) {
273 lapic_timer_set_divisor(lapic_timer_divisor_idx);
274 lapic_timer_oneshot(APIC_TIMER_MAX_COUNT);
276 value = APIC_TIMER_MAX_COUNT - lapic->ccr_timer;
277 if (value != APIC_TIMER_MAX_COUNT)
280 if (lapic_timer_divisor_idx >= APIC_TIMER_NDIVISORS)
281 panic("lapic: no proper timer divisor?!\n");
282 lapic_cputimer_intr.freq = value / 2;
284 kprintf("lapic: divisor index %d, frequency %u Hz\n",
285 lapic_timer_divisor_idx, lapic_cputimer_intr.freq);
289 lapic_timer_process_oncpu(struct globaldata *gd, struct intrframe *frame)
293 gd->gd_timer_running = 0;
295 count = sys_cputimer->count();
296 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
297 systimer_intr(&count, 0, frame);
301 lapic_timer_process(void)
303 lapic_timer_process_oncpu(mycpu, NULL);
307 lapic_timer_process_frame(struct intrframe *frame)
309 lapic_timer_process_oncpu(mycpu, frame);
313 lapic_timer_intr_reload(struct cputimer_intr *cti, sysclock_t reload)
315 struct globaldata *gd = mycpu;
317 reload = (int64_t)reload * cti->freq / sys_cputimer->freq;
321 if (gd->gd_timer_running) {
322 if (reload < lapic->ccr_timer)
323 lapic_timer_oneshot_quick(reload);
325 gd->gd_timer_running = 1;
326 lapic_timer_oneshot_quick(reload);
331 lapic_timer_intr_enable(struct cputimer_intr *cti __unused)
335 timer = lapic->lvt_timer;
336 timer &= ~(APIC_LVTT_MASKED | APIC_LVTT_PERIODIC);
337 lapic->lvt_timer = timer;
339 lapic_timer_fixup_handler(NULL);
343 lapic_timer_fixup_handler(void *arg)
350 if (cpu_vendor_id == CPU_VENDOR_AMD) {
352 * Detect the presence of C1E capability mostly on latest
353 * dual-cores (or future) k8 family. This feature renders
354 * the local APIC timer dead, so we disable it by reading
355 * the Interrupt Pending Message register and clearing both
356 * C1eOnCmpHalt (bit 28) and SmiOnCmpHalt (bit 27).
359 * "BIOS and Kernel Developer's Guide for AMD NPT
360 * Family 0Fh Processors"
361 * #32559 revision 3.00
363 if ((cpu_id & 0x00000f00) == 0x00000f00 &&
364 (cpu_id & 0x0fff0000) >= 0x00040000) {
367 msr = rdmsr(0xc0010055);
368 if (msr & 0x18000000) {
369 struct globaldata *gd = mycpu;
371 kprintf("cpu%d: AMD C1E detected\n",
373 wrmsr(0xc0010055, msr & ~0x18000000ULL);
376 * We are kinda stalled;
379 gd->gd_timer_running = 1;
380 lapic_timer_oneshot_quick(2);
390 lapic_timer_restart_handler(void *dummy __unused)
394 lapic_timer_fixup_handler(&started);
396 struct globaldata *gd = mycpu;
398 gd->gd_timer_running = 1;
399 lapic_timer_oneshot_quick(2);
404 * This function is called only by ACPI-CA code currently:
405 * - AMD C1E fixup. AMD C1E only seems to happen after ACPI
406 * module controls PM. So once ACPI-CA is attached, we try
407 * to apply the fixup to prevent LAPIC timer from hanging.
410 lapic_timer_intr_pmfixup(struct cputimer_intr *cti __unused)
412 lwkt_send_ipiq_mask(smp_active_mask,
413 lapic_timer_fixup_handler, NULL);
417 lapic_timer_intr_restart(struct cputimer_intr *cti __unused)
419 lwkt_send_ipiq_mask(smp_active_mask, lapic_timer_restart_handler, NULL);
424 * dump contents of local APIC registers
429 kprintf("SMP: CPU%d %s:\n", mycpu->gd_cpuid, str);
430 kprintf(" lint0: 0x%08x lint1: 0x%08x TPR: 0x%08x SVR: 0x%08x\n",
431 lapic->lvt_lint0, lapic->lvt_lint1, lapic->tpr, lapic->svr);
435 * Inter Processor Interrupt functions.
439 * Send APIC IPI 'vector' to 'destType' via 'deliveryMode'.
441 * destType is 1 of: APIC_DEST_SELF, APIC_DEST_ALLISELF, APIC_DEST_ALLESELF
442 * vector is any valid SYSTEM INT vector
443 * delivery_mode is 1 of: APIC_DELMODE_FIXED, APIC_DELMODE_LOWPRIO
445 * A backlog of requests can create a deadlock between cpus. To avoid this
446 * we have to be able to accept IPIs at the same time we are trying to send
447 * them. The critical section prevents us from attempting to send additional
448 * IPIs reentrantly, but also prevents IPIQ processing so we have to call
449 * lwkt_process_ipiq() manually. It's rather messy and expensive for this
450 * to occur but fortunately it does not happen too often.
453 apic_ipi(int dest_type, int vector, int delivery_mode)
458 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
459 unsigned int eflags = read_eflags();
461 DEBUG_PUSH_INFO("apic_ipi");
462 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
466 write_eflags(eflags);
469 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK) | dest_type |
470 delivery_mode | vector;
471 lapic->icr_lo = icr_lo;
477 single_apic_ipi(int cpu, int vector, int delivery_mode)
483 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
484 unsigned int eflags = read_eflags();
486 DEBUG_PUSH_INFO("single_apic_ipi");
487 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
491 write_eflags(eflags);
493 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
494 icr_hi |= (CPUID_TO_APICID(cpu) << 24);
495 lapic->icr_hi = icr_hi;
498 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK)
499 | APIC_DEST_DESTFLD | delivery_mode | vector;
502 lapic->icr_lo = icr_lo;
509 * Returns 0 if the apic is busy, 1 if we were able to queue the request.
511 * NOT WORKING YET! The code as-is may end up not queueing an IPI at all
512 * to the target, and the scheduler does not 'poll' for IPI messages.
515 single_apic_ipi_passive(int cpu, int vector, int delivery_mode)
521 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
525 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
526 icr_hi |= (CPUID_TO_APICID(cpu) << 24);
527 lapic->icr_hi = icr_hi;
530 icr_lo = (lapic->icr_lo & APIC_RESV2_MASK)
531 | APIC_DEST_DESTFLD | delivery_mode | vector;
534 lapic->icr_lo = icr_lo;
542 * Send APIC IPI 'vector' to 'target's via 'delivery_mode'.
544 * target is a bitmask of destination cpus. Vector is any
545 * valid system INT vector. Delivery mode may be either
546 * APIC_DELMODE_FIXED or APIC_DELMODE_LOWPRIO.
549 selected_apic_ipi(cpumask_t target, int vector, int delivery_mode)
553 int n = BSFCPUMASK(target);
554 target &= ~CPUMASK(n);
555 single_apic_ipi(n, vector, delivery_mode);
561 * Timer code, in development...
562 * - suggested by rgrimes@gndrsh.aac.dev.com
565 get_apic_timer_frequency(void)
567 return(lapic_cputimer_intr.freq);
571 * Load a 'downcount time' in uSeconds.
574 set_apic_timer(int us)
579 * When we reach here, lapic timer's frequency
580 * must have been calculated as well as the
581 * divisor (lapic.dcr_timer is setup during the
582 * divisor calculation).
584 KKASSERT(lapic_cputimer_intr.freq != 0 &&
585 lapic_timer_divisor_idx >= 0);
587 count = ((us * (int64_t)lapic_cputimer_intr.freq) + 999999) / 1000000;
588 lapic_timer_oneshot(count);
593 * Read remaining time in timer.
596 read_apic_timer(void)
599 /** XXX FIXME: we need to return the actual remaining time,
600 * for now we just return the remaining count.
603 return lapic->ccr_timer;
609 * Spin-style delay, set delay time in uS, spin till it drains.
614 set_apic_timer(count);
615 while (read_apic_timer())
620 lapic_unused_apic_id(int start)
624 for (i = start; i < NAPICID; ++i) {
625 if (APICID_TO_CPUID(i) == -1)
632 lapic_map(vm_offset_t lapic_addr)
634 lapic = pmap_mapdev_uncacheable(lapic_addr, sizeof(struct LAPIC));
636 kprintf("lapic: at %p\n", (void *)lapic_addr);
639 static TAILQ_HEAD(, lapic_enumerator) lapic_enumerators =
640 TAILQ_HEAD_INITIALIZER(lapic_enumerators);
645 struct lapic_enumerator *e;
646 int error, i, ap_max;
648 KKASSERT(lapic_enable);
650 for (i = 0; i < NAPICID; ++i)
651 APICID_TO_CPUID(i) = -1;
653 TAILQ_FOREACH(e, &lapic_enumerators, lapic_link) {
654 error = e->lapic_probe(e);
659 kprintf("LAPIC: Can't find LAPIC\n");
663 e->lapic_enumerate(e);
666 TUNABLE_INT_FETCH("hw.ap_max", &ap_max);
667 if (ap_max > MAXCPU - 1)
671 kprintf("LAPIC: Warning use only %d out of %d "
672 "available APs\n", ap_max, naps);
680 lapic_enumerator_register(struct lapic_enumerator *ne)
682 struct lapic_enumerator *e;
684 TAILQ_FOREACH(e, &lapic_enumerators, lapic_link) {
685 if (e->lapic_prio < ne->lapic_prio) {
686 TAILQ_INSERT_BEFORE(e, ne, lapic_link);
690 TAILQ_INSERT_TAIL(&lapic_enumerators, ne, lapic_link);
694 lapic_set_cpuid(int cpu_id, int apic_id)
696 CPUID_TO_APICID(cpu_id) = apic_id;
697 APICID_TO_CPUID(apic_id) = cpu_id;
701 lapic_fixup_noioapic(void)
705 /* Only allowed on BSP */
706 KKASSERT(mycpuid == 0);
707 KKASSERT(!ioapic_enable);
709 temp = lapic->lvt_lint0;
710 temp &= ~APIC_LVT_MASKED;
711 lapic->lvt_lint0 = temp;
713 temp = lapic->lvt_lint1;
714 temp |= APIC_LVT_MASKED;
715 lapic->lvt_lint1 = temp;
719 lapic_sysinit(void *dummy __unused)
724 error = lapic_config();
730 /* Initialize BSP's local APIC */
732 } else if (ioapic_enable) {
734 icu_reinit_noioapic();
737 SYSINIT(lapic, SI_BOOT2_LAPIC, SI_ORDER_FIRST, lapic_sysinit, NULL)