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 $
26 * $DragonFly: src/sys/platform/pc32/apic/mpapic.c,v 1.22 2008/04/20 13:44:26 swildner Exp $
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <machine/globaldata.h>
33 #include <machine/smp.h>
34 #include <machine/md_var.h>
35 #include <machine_base/apic/mpapic.h>
36 #include <machine/segments.h>
37 #include <sys/thread2.h>
39 #include <machine_base/isa/intr_machdep.h> /* Xspuriousint() */
41 /* EISA Edge/Level trigger control registers */
42 #define ELCR0 0x4d0 /* eisa irq 0-7 */
43 #define ELCR1 0x4d1 /* eisa irq 8-15 */
45 volatile lapic_t *lapic;
47 static void lapic_timer_calibrate(void);
48 static void lapic_timer_set_divisor(int);
49 static void lapic_timer_fixup_handler(void *);
50 static void lapic_timer_restart_handler(void *);
52 void lapic_timer_process(void);
53 void lapic_timer_process_frame(struct intrframe *);
55 static int lapic_timer_enable = 1;
56 TUNABLE_INT("hw.lapic_timer_enable", &lapic_timer_enable);
58 static void lapic_timer_intr_reload(struct cputimer_intr *, sysclock_t);
59 static void lapic_timer_intr_enable(struct cputimer_intr *);
60 static void lapic_timer_intr_restart(struct cputimer_intr *);
61 static void lapic_timer_intr_pmfixup(struct cputimer_intr *);
63 static struct cputimer_intr lapic_cputimer_intr = {
65 .reload = lapic_timer_intr_reload,
66 .enable = lapic_timer_intr_enable,
67 .config = cputimer_intr_default_config,
68 .restart = lapic_timer_intr_restart,
69 .pmfixup = lapic_timer_intr_pmfixup,
70 .initclock = cputimer_intr_default_initclock,
71 .next = SLIST_ENTRY_INITIALIZER,
73 .type = CPUTIMER_INTR_LAPIC,
74 .prio = CPUTIMER_INTR_PRIO_LAPIC,
75 .caps = CPUTIMER_INTR_CAP_NONE
79 * pointers to pmapped apic hardware.
82 volatile ioapic_t **ioapic;
84 static int lapic_timer_divisor_idx = -1;
85 static const uint32_t lapic_timer_divisors[] = {
86 APIC_TDCR_2, APIC_TDCR_4, APIC_TDCR_8, APIC_TDCR_16,
87 APIC_TDCR_32, APIC_TDCR_64, APIC_TDCR_128, APIC_TDCR_1
89 #define APIC_TIMER_NDIVISORS \
90 (int)(sizeof(lapic_timer_divisors) / sizeof(lapic_timer_divisors[0]))
101 * Enable APIC, configure interrupts.
104 apic_initialize(boolean_t bsp)
110 * setup LVT1 as ExtINT on the BSP. This is theoretically an
111 * aggregate interrupt input from the 8259. The INTA cycle
112 * will be routed to the external controller (the 8259) which
113 * is expected to supply the vector.
115 * Must be setup edge triggered, active high.
117 * Disable LVT1 on the APs. It doesn't matter what delivery
118 * mode we use because we leave it masked.
120 temp = lapic->lvt_lint0;
121 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
122 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
123 if (mycpu->gd_cpuid == 0)
124 temp |= APIC_LVT_DM_EXTINT;
126 temp |= APIC_LVT_DM_FIXED | APIC_LVT_MASKED;
127 lapic->lvt_lint0 = temp;
130 * setup LVT2 as NMI, masked till later. Edge trigger, active high.
132 temp = lapic->lvt_lint1;
133 temp &= ~(APIC_LVT_MASKED | APIC_LVT_TRIG_MASK |
134 APIC_LVT_POLARITY_MASK | APIC_LVT_DM_MASK);
135 temp |= APIC_LVT_MASKED | APIC_LVT_DM_NMI;
136 lapic->lvt_lint1 = temp;
139 * Mask the apic error interrupt, apic performance counter
142 lapic->lvt_error = lapic->lvt_error | APIC_LVT_MASKED;
143 lapic->lvt_pcint = lapic->lvt_pcint | APIC_LVT_MASKED;
145 /* Set apic timer vector and mask the apic timer interrupt. */
146 timer = lapic->lvt_timer;
147 timer &= ~APIC_LVTT_VECTOR;
148 timer |= XTIMER_OFFSET;
149 timer |= APIC_LVTT_MASKED;
150 lapic->lvt_timer = timer;
153 * Set the Task Priority Register as needed. At the moment allow
154 * interrupts on all cpus (the APs will remain CLId until they are
155 * ready to deal). We could disable all but IPIs by setting
156 * temp |= TPR_IPI_ONLY for cpu != 0.
159 temp &= ~APIC_TPR_PRIO; /* clear priority field */
162 * If we are NOT running the IO APICs, the LAPIC will only be used
163 * for IPIs. Set the TPR to prevent any unintentional interrupts.
165 temp |= TPR_IPI_ONLY;
171 * enable the local APIC
174 temp |= APIC_SVR_ENABLE; /* enable the APIC */
175 temp &= ~APIC_SVR_FOCUS_DISABLE; /* enable lopri focus processor */
178 * Set the spurious interrupt vector. The low 4 bits of the vector
181 if ((XSPURIOUSINT_OFFSET & 0x0F) != 0x0F)
182 panic("bad XSPURIOUSINT_OFFSET: 0x%08x", XSPURIOUSINT_OFFSET);
183 temp &= ~APIC_SVR_VECTOR;
184 temp |= XSPURIOUSINT_OFFSET;
189 * Pump out a few EOIs to clean out interrupts that got through
190 * before we were able to set the TPR.
197 lapic_timer_calibrate();
198 if (lapic_timer_enable) {
199 cputimer_intr_register(&lapic_cputimer_intr);
200 cputimer_intr_select(&lapic_cputimer_intr, 0);
203 lapic_timer_set_divisor(lapic_timer_divisor_idx);
207 apic_dump("apic_initialize()");
212 lapic_timer_set_divisor(int divisor_idx)
214 KKASSERT(divisor_idx >= 0 && divisor_idx < APIC_TIMER_NDIVISORS);
215 lapic->dcr_timer = lapic_timer_divisors[divisor_idx];
219 lapic_timer_oneshot(u_int count)
223 value = lapic->lvt_timer;
224 value &= ~APIC_LVTT_PERIODIC;
225 lapic->lvt_timer = value;
226 lapic->icr_timer = count;
230 lapic_timer_oneshot_quick(u_int count)
232 lapic->icr_timer = count;
236 lapic_timer_calibrate(void)
240 /* Try to calibrate the local APIC timer. */
241 for (lapic_timer_divisor_idx = 0;
242 lapic_timer_divisor_idx < APIC_TIMER_NDIVISORS;
243 lapic_timer_divisor_idx++) {
244 lapic_timer_set_divisor(lapic_timer_divisor_idx);
245 lapic_timer_oneshot(APIC_TIMER_MAX_COUNT);
247 value = APIC_TIMER_MAX_COUNT - lapic->ccr_timer;
248 if (value != APIC_TIMER_MAX_COUNT)
251 if (lapic_timer_divisor_idx >= APIC_TIMER_NDIVISORS)
252 panic("lapic: no proper timer divisor?!\n");
253 lapic_cputimer_intr.freq = value / 2;
255 kprintf("lapic: divisor index %d, frequency %u Hz\n",
256 lapic_timer_divisor_idx, lapic_cputimer_intr.freq);
260 lapic_timer_process_oncpu(struct globaldata *gd, struct intrframe *frame)
264 gd->gd_timer_running = 0;
266 count = sys_cputimer->count();
267 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
268 systimer_intr(&count, 0, frame);
272 lapic_timer_process(void)
274 lapic_timer_process_oncpu(mycpu, NULL);
278 lapic_timer_process_frame(struct intrframe *frame)
280 lapic_timer_process_oncpu(mycpu, frame);
284 lapic_timer_intr_reload(struct cputimer_intr *cti, sysclock_t reload)
286 struct globaldata *gd = mycpu;
288 reload = (int64_t)reload * cti->freq / sys_cputimer->freq;
292 if (gd->gd_timer_running) {
293 if (reload < lapic->ccr_timer)
294 lapic_timer_oneshot_quick(reload);
296 gd->gd_timer_running = 1;
297 lapic_timer_oneshot_quick(reload);
302 lapic_timer_intr_enable(struct cputimer_intr *cti __unused)
306 timer = lapic->lvt_timer;
307 timer &= ~(APIC_LVTT_MASKED | APIC_LVTT_PERIODIC);
308 lapic->lvt_timer = timer;
310 lapic_timer_fixup_handler(NULL);
314 lapic_timer_fixup_handler(void *arg)
321 if (strcmp(cpu_vendor, "AuthenticAMD") == 0) {
323 * Detect the presence of C1E capability mostly on latest
324 * dual-cores (or future) k8 family. This feature renders
325 * the local APIC timer dead, so we disable it by reading
326 * the Interrupt Pending Message register and clearing both
327 * C1eOnCmpHalt (bit 28) and SmiOnCmpHalt (bit 27).
330 * "BIOS and Kernel Developer's Guide for AMD NPT
331 * Family 0Fh Processors"
332 * #32559 revision 3.00
334 if ((cpu_id & 0x00000f00) == 0x00000f00 &&
335 (cpu_id & 0x0fff0000) >= 0x00040000) {
338 msr = rdmsr(0xc0010055);
339 if (msr & 0x18000000) {
340 struct globaldata *gd = mycpu;
342 kprintf("cpu%d: AMD C1E detected\n",
344 wrmsr(0xc0010055, msr & ~0x18000000ULL);
347 * We are kinda stalled;
350 gd->gd_timer_running = 1;
351 lapic_timer_oneshot_quick(2);
361 lapic_timer_restart_handler(void *dummy __unused)
365 lapic_timer_fixup_handler(&started);
367 struct globaldata *gd = mycpu;
369 gd->gd_timer_running = 1;
370 lapic_timer_oneshot_quick(2);
375 * This function is called only by ACPI-CA code currently:
376 * - AMD C1E fixup. AMD C1E only seems to happen after ACPI
377 * module controls PM. So once ACPI-CA is attached, we try
378 * to apply the fixup to prevent LAPIC timer from hanging.
381 lapic_timer_intr_pmfixup(struct cputimer_intr *cti __unused)
383 lwkt_send_ipiq_mask(smp_active_mask,
384 lapic_timer_fixup_handler, NULL);
388 lapic_timer_intr_restart(struct cputimer_intr *cti __unused)
390 lwkt_send_ipiq_mask(smp_active_mask, lapic_timer_restart_handler, NULL);
395 * dump contents of local APIC registers
400 kprintf("SMP: CPU%d %s:\n", mycpu->gd_cpuid, str);
401 kprintf(" lint0: 0x%08x lint1: 0x%08x TPR: 0x%08x SVR: 0x%08x\n",
402 lapic->lvt_lint0, lapic->lvt_lint1, lapic->tpr, lapic->svr);
412 #define IOAPIC_ISA_INTS 16
413 #define REDIRCNT_IOAPIC(A) \
414 ((int)((io_apic_versions[(A)] & IOART_VER_MAXREDIR) >> MAXREDIRSHIFT) + 1)
416 static int trigger (int apic, int pin, u_int32_t * flags);
417 static void polarity (int apic, int pin, u_int32_t * flags, int level);
419 #define DEFAULT_FLAGS \
425 #define DEFAULT_ISA_FLAGS \
434 io_apic_set_id(int apic, int id)
438 ux = io_apic_read(apic, IOAPIC_ID); /* get current contents */
439 if (((ux & APIC_ID_MASK) >> 24) != id) {
440 kprintf("Changing APIC ID for IO APIC #%d"
441 " from %d to %d on chip\n",
442 apic, ((ux & APIC_ID_MASK) >> 24), id);
443 ux &= ~APIC_ID_MASK; /* clear the ID field */
445 io_apic_write(apic, IOAPIC_ID, ux); /* write new value */
446 ux = io_apic_read(apic, IOAPIC_ID); /* re-read && test */
447 if (((ux & APIC_ID_MASK) >> 24) != id)
448 panic("can't control IO APIC #%d ID, reg: 0x%08x",
455 io_apic_get_id(int apic)
457 return (io_apic_read(apic, IOAPIC_ID) & APIC_ID_MASK) >> 24;
466 extern int apic_pin_trigger; /* 'opaque' */
469 io_apic_setup_intpin(int apic, int pin)
471 int bus, bustype, irq;
472 u_char select; /* the select register is 8 bits */
473 u_int32_t flags; /* the window register is 32 bits */
474 u_int32_t target; /* the window register is 32 bits */
475 u_int32_t vector; /* the window register is 32 bits */
480 select = pin * 2 + IOAPIC_REDTBL0; /* register */
483 * Always clear an IO APIC pin before [re]programming it. This is
484 * particularly important if the pin is set up for a level interrupt
485 * as the IOART_REM_IRR bit might be set. When we reprogram the
486 * vector any EOI from pending ints on this pin could be lost and
487 * IRR might never get reset.
489 * To fix this problem, clear the vector and make sure it is
490 * programmed as an edge interrupt. This should theoretically
491 * clear IRR so we can later, safely program it as a level
496 flags = io_apic_read(apic, select) & IOART_RESV;
497 flags |= IOART_INTMSET | IOART_TRGREDG | IOART_INTAHI;
498 flags |= IOART_DESTPHY | IOART_DELFIXED;
500 target = io_apic_read(apic, select + 1) & IOART_HI_DEST_RESV;
501 target |= 0; /* fixed mode cpu mask of 0 - don't deliver anywhere */
505 io_apic_write(apic, select, flags | vector);
506 io_apic_write(apic, select + 1, target);
511 * We only deal with vectored interrupts here. ? documentation is
512 * lacking, I'm guessing an interrupt type of 0 is the 'INT' type,
515 * This test also catches unconfigured pins.
517 if (apic_int_type(apic, pin) != 0)
521 * Leave the pin unprogrammed if it does not correspond to
524 irq = apic_irq(apic, pin);
528 /* determine the bus type for this pin */
529 bus = apic_src_bus_id(apic, pin);
532 bustype = apic_bus_type(bus);
534 if ((bustype == ISA) &&
535 (pin < IOAPIC_ISA_INTS) &&
537 (apic_polarity(apic, pin) == 0x1) &&
538 (apic_trigger(apic, pin) == 0x3)) {
540 * A broken BIOS might describe some ISA
541 * interrupts as active-high level-triggered.
542 * Use default ISA flags for those interrupts.
544 flags = DEFAULT_ISA_FLAGS;
547 * Program polarity and trigger mode according to
550 flags = DEFAULT_FLAGS;
551 level = trigger(apic, pin, &flags);
553 apic_pin_trigger |= (1 << irq);
554 polarity(apic, pin, &flags, level);
558 ksnprintf(envpath, sizeof(envpath), "hw.irq.%d.dest", irq);
559 kgetenv_int(envpath, &cpuid);
561 /* ncpus may not be available yet */
566 kprintf("IOAPIC #%d intpin %d -> irq %d (CPU%d)\n",
567 apic, pin, irq, cpuid);
571 * Program the appropriate registers. This routing may be
572 * overridden when an interrupt handler for a device is
573 * actually added (see register_int(), which calls through
574 * the MACHINTR ABI to set up an interrupt handler/vector).
576 * The order in which we must program the two registers for
577 * safety is unclear! XXX
581 vector = IDT_OFFSET + irq; /* IDT vec */
582 target = io_apic_read(apic, select + 1) & IOART_HI_DEST_RESV;
583 /* Deliver all interrupts to CPU0 (BSP) */
584 target |= (CPU_TO_ID(cpuid) << IOART_HI_DEST_SHIFT) &
586 flags |= io_apic_read(apic, select) & IOART_RESV;
587 io_apic_write(apic, select, flags | vector);
588 io_apic_write(apic, select + 1, target);
594 io_apic_setup(int apic)
600 apic_pin_trigger = 0; /* default to edge-triggered */
602 maxpin = REDIRCNT_IOAPIC(apic); /* pins in APIC */
603 kprintf("Programming %d pins in IOAPIC #%d\n", maxpin, apic);
605 for (pin = 0; pin < maxpin; ++pin) {
606 io_apic_setup_intpin(apic, pin);
609 if (apic_int_type(apic, pin) >= 0) {
610 kprintf("Warning: IOAPIC #%d pin %d does not exist,"
611 " cannot program!\n", apic, pin);
616 /* return GOOD status */
619 #undef DEFAULT_ISA_FLAGS
623 #define DEFAULT_EXTINT_FLAGS \
632 * XXX this function is only used by 8254 setup
633 * Setup the source of External INTerrupts.
636 ext_int_setup(int apic, int intr)
638 u_char select; /* the select register is 8 bits */
639 u_int32_t flags; /* the window register is 32 bits */
640 u_int32_t target; /* the window register is 32 bits */
641 u_int32_t vector; /* the window register is 32 bits */
645 if (apic_int_type(apic, intr) != 3)
649 ksnprintf(envpath, sizeof(envpath), "hw.irq.%d.dest", intr);
650 kgetenv_int(envpath, &cpuid);
652 /* ncpus may not be available yet */
656 /* Deliver interrupts to CPU0 (BSP) */
657 target = (CPU_TO_ID(cpuid) << IOART_HI_DEST_SHIFT) &
659 select = IOAPIC_REDTBL0 + (2 * intr);
660 vector = IDT_OFFSET + intr;
661 flags = DEFAULT_EXTINT_FLAGS;
663 io_apic_write(apic, select, flags | vector);
664 io_apic_write(apic, select + 1, target);
668 #undef DEFAULT_EXTINT_FLAGS
672 * Set the trigger level for an IO APIC pin.
675 trigger(int apic, int pin, u_int32_t * flags)
680 static int intcontrol = -1;
682 switch (apic_trigger(apic, pin)) {
688 *flags &= ~IOART_TRGRLVL; /* *flags |= IOART_TRGREDG */
692 *flags |= IOART_TRGRLVL;
700 if ((id = apic_src_bus_id(apic, pin)) == -1)
703 switch (apic_bus_type(id)) {
705 *flags &= ~IOART_TRGRLVL; /* *flags |= IOART_TRGREDG; */
709 eirq = apic_src_bus_irq(apic, pin);
711 if (eirq < 0 || eirq > 15) {
712 kprintf("EISA IRQ %d?!?!\n", eirq);
716 if (intcontrol == -1) {
717 intcontrol = inb(ELCR1) << 8;
718 intcontrol |= inb(ELCR0);
719 kprintf("EISA INTCONTROL = %08x\n", intcontrol);
722 /* Use ELCR settings to determine level or edge mode */
723 level = (intcontrol >> eirq) & 1;
726 * Note that on older Neptune chipset based systems, any
727 * pci interrupts often show up here and in the ELCR as well
728 * as level sensitive interrupts attributed to the EISA bus.
732 *flags |= IOART_TRGRLVL;
734 *flags &= ~IOART_TRGRLVL;
739 *flags |= IOART_TRGRLVL;
748 panic("bad APIC IO INT flags");
753 * Set the polarity value for an IO APIC pin.
756 polarity(int apic, int pin, u_int32_t * flags, int level)
760 switch (apic_polarity(apic, pin)) {
766 *flags &= ~IOART_INTALO; /* *flags |= IOART_INTAHI */
770 *flags |= IOART_INTALO;
778 if ((id = apic_src_bus_id(apic, pin)) == -1)
781 switch (apic_bus_type(id)) {
783 *flags &= ~IOART_INTALO; /* *flags |= IOART_INTAHI */
787 /* polarity converter always gives active high */
788 *flags &= ~IOART_INTALO;
792 *flags |= IOART_INTALO;
801 panic("bad APIC IO INT flags");
806 * Print contents of apic_imen.
808 extern u_int apic_imen; /* keep apic_imen 'opaque' */
814 kprintf("SMP: enabled INTs: ");
815 for (x = 0; x < 24; ++x)
816 if ((apic_imen & (1 << x)) == 0)
818 kprintf("apic_imen: 0x%08x\n", apic_imen);
823 * Inter Processor Interrupt functions.
829 * Send APIC IPI 'vector' to 'destType' via 'deliveryMode'.
831 * destType is 1 of: APIC_DEST_SELF, APIC_DEST_ALLISELF, APIC_DEST_ALLESELF
832 * vector is any valid SYSTEM INT vector
833 * delivery_mode is 1 of: APIC_DELMODE_FIXED, APIC_DELMODE_LOWPRIO
835 * A backlog of requests can create a deadlock between cpus. To avoid this
836 * we have to be able to accept IPIs at the same time we are trying to send
837 * them. The critical section prevents us from attempting to send additional
838 * IPIs reentrantly, but also prevents IPIQ processing so we have to call
839 * lwkt_process_ipiq() manually. It's rather messy and expensive for this
840 * to occur but fortunately it does not happen too often.
843 apic_ipi(int dest_type, int vector, int delivery_mode)
848 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
849 unsigned long rflags = read_rflags();
851 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
854 write_rflags(rflags);
857 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK) | dest_type |
858 delivery_mode | vector;
859 lapic->icr_lo = icr_lo;
865 single_apic_ipi(int cpu, int vector, int delivery_mode)
871 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
872 unsigned long rflags = read_rflags();
874 while ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
877 write_rflags(rflags);
879 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
880 icr_hi |= (CPU_TO_ID(cpu) << 24);
881 lapic->icr_hi = icr_hi;
884 icr_lo = (lapic->icr_lo & APIC_ICRLO_RESV_MASK)
885 | APIC_DEST_DESTFLD | delivery_mode | vector;
888 lapic->icr_lo = icr_lo;
895 * Returns 0 if the apic is busy, 1 if we were able to queue the request.
897 * NOT WORKING YET! The code as-is may end up not queueing an IPI at all
898 * to the target, and the scheduler does not 'poll' for IPI messages.
901 single_apic_ipi_passive(int cpu, int vector, int delivery_mode)
907 if ((lapic->icr_lo & APIC_DELSTAT_MASK) != 0) {
911 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
912 icr_hi |= (CPU_TO_ID(cpu) << 24);
913 lapic->icr_hi = icr_hi;
916 icr_lo = (lapic->icr_lo & APIC_RESV2_MASK)
917 | APIC_DEST_DESTFLD | delivery_mode | vector;
920 lapic->icr_lo = icr_lo;
928 * Send APIC IPI 'vector' to 'target's via 'delivery_mode'.
930 * target is a bitmask of destination cpus. Vector is any
931 * valid system INT vector. Delivery mode may be either
932 * APIC_DELMODE_FIXED or APIC_DELMODE_LOWPRIO.
935 selected_apic_ipi(u_int target, int vector, int delivery_mode)
939 int n = bsfl(target);
941 single_apic_ipi(n, vector, delivery_mode);
947 * Timer code, in development...
948 * - suggested by rgrimes@gndrsh.aac.dev.com
952 * Load a 'downcount time' in uSeconds.
955 set_apic_timer(int us)
960 * When we reach here, lapic timer's frequency
961 * must have been calculated as well as the
962 * divisor (lapic->dcr_timer is setup during the
963 * divisor calculation).
965 KKASSERT(lapic_cputimer_intr.freq != 0 &&
966 lapic_timer_divisor_idx >= 0);
968 count = ((us * (int64_t)lapic_cputimer_intr.freq) + 999999) / 1000000;
969 lapic_timer_oneshot(count);
974 * Read remaining time in timer.
977 read_apic_timer(void)
980 /** XXX FIXME: we need to return the actual remaining time,
981 * for now we just return the remaining count.
984 return lapic->ccr_timer;
990 * Spin-style delay, set delay time in uS, spin till it drains.
995 set_apic_timer(count);
996 while (read_apic_timer())