2 * Local APIC handling, local APIC timers
4 * (c) 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com>
7 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
8 * thanks to Eric Gilmore
10 * for testing these extensively.
11 * Maciej W. Rozycki : Various updates and fixes.
12 * Mikael Pettersson : Power Management for UP-APIC.
14 * Mikael Pettersson : PM converted to driver model.
17 #include <linux/kernel_stat.h>
18 #include <linux/mc146818rtc.h>
19 #include <linux/acpi_pmtmr.h>
20 #include <linux/clockchips.h>
21 #include <linux/interrupt.h>
22 #include <linux/bootmem.h>
23 #include <linux/ftrace.h>
24 #include <linux/ioport.h>
25 #include <linux/module.h>
26 #include <linux/sysdev.h>
27 #include <linux/delay.h>
28 #include <linux/timex.h>
29 #include <linux/dmar.h>
30 #include <linux/init.h>
31 #include <linux/cpu.h>
32 #include <linux/dmi.h>
33 #include <linux/nmi.h>
34 #include <linux/smp.h>
37 #include <asm/pgalloc.h>
38 #include <asm/atomic.h>
39 #include <asm/mpspec.h>
40 #include <asm/i8253.h>
41 #include <asm/i8259.h>
42 #include <asm/proto.h>
51 unsigned int num_processors;
53 unsigned disabled_cpus __cpuinitdata;
55 /* Processor that is doing the boot up */
56 unsigned int boot_cpu_physical_apicid = -1U;
59 * The highest APIC ID seen during enumeration.
61 * This determines the messaging protocol we can use: if all APIC IDs
62 * are in the 0 ... 7 range, then we can use logical addressing which
63 * has some performance advantages (better broadcasting).
65 * If there's an APIC ID above 8, we use physical addressing.
67 unsigned int max_physical_apicid;
70 * Bitmask of physically existing CPUs:
72 physid_mask_t phys_cpu_present_map;
75 * Map cpu index to physical APIC ID
77 DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
78 DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
79 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
80 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
84 * Knob to control our willingness to enable the local APIC.
88 static int force_enable_local_apic;
90 * APIC command line parameters
92 static int __init parse_lapic(char *arg)
94 force_enable_local_apic = 1;
97 early_param("lapic", parse_lapic);
98 /* Local APIC was disabled by the BIOS and enabled by the kernel */
99 static int enabled_via_apicbase;
104 static int apic_calibrate_pmtmr __initdata;
105 static __init int setup_apicpmtimer(char *s)
107 apic_calibrate_pmtmr = 1;
111 __setup("apicpmtimer", setup_apicpmtimer);
114 #ifdef CONFIG_X86_X2APIC
116 /* x2apic enabled before OS handover */
117 static int x2apic_preenabled;
118 static int disable_x2apic;
119 static __init int setup_nox2apic(char *str)
122 setup_clear_cpu_cap(X86_FEATURE_X2APIC);
125 early_param("nox2apic", setup_nox2apic);
128 unsigned long mp_lapic_addr;
130 /* Disable local APIC timer from the kernel commandline or via dmi quirk */
131 static int disable_apic_timer __cpuinitdata;
132 /* Local APIC timer works in C2 */
133 int local_apic_timer_c2_ok;
134 EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
136 int first_system_vector = 0xfe;
139 * Debug level, exported for io_apic.c
141 unsigned int apic_verbosity;
145 /* Have we found an MP table */
146 int smp_found_config;
148 static struct resource lapic_resource = {
149 .name = "Local APIC",
150 .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
153 static unsigned int calibration_result;
155 static int lapic_next_event(unsigned long delta,
156 struct clock_event_device *evt);
157 static void lapic_timer_setup(enum clock_event_mode mode,
158 struct clock_event_device *evt);
159 static void lapic_timer_broadcast(const struct cpumask *mask);
160 static void apic_pm_activate(void);
163 * The local apic timer can be used for any function which is CPU local.
165 static struct clock_event_device lapic_clockevent = {
167 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT
168 | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY,
170 .set_mode = lapic_timer_setup,
171 .set_next_event = lapic_next_event,
172 .broadcast = lapic_timer_broadcast,
176 static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
178 static unsigned long apic_phys;
181 * Get the LAPIC version
183 static inline int lapic_get_version(void)
185 return GET_APIC_VERSION(apic_read(APIC_LVR));
189 * Check, if the APIC is integrated or a separate chip
191 static inline int lapic_is_integrated(void)
196 return APIC_INTEGRATED(lapic_get_version());
201 * Check, whether this is a modern or a first generation APIC
203 static int modern_apic(void)
205 /* AMD systems use old APIC versions, so check the CPU */
206 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
207 boot_cpu_data.x86 >= 0xf)
209 return lapic_get_version() >= 0x14;
212 void native_apic_wait_icr_idle(void)
214 while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
218 u32 native_safe_apic_wait_icr_idle(void)
225 send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
229 } while (timeout++ < 1000);
234 void native_apic_icr_write(u32 low, u32 id)
236 apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id));
237 apic_write(APIC_ICR, low);
240 u64 native_apic_icr_read(void)
244 icr2 = apic_read(APIC_ICR2);
245 icr1 = apic_read(APIC_ICR);
247 return icr1 | ((u64)icr2 << 32);
251 * enable_NMI_through_LVT0 - enable NMI through local vector table 0
253 void __cpuinit enable_NMI_through_LVT0(void)
257 /* unmask and set to NMI */
260 /* Level triggered for 82489DX (32bit mode) */
261 if (!lapic_is_integrated())
262 v |= APIC_LVT_LEVEL_TRIGGER;
264 apic_write(APIC_LVT0, v);
269 * get_physical_broadcast - Get number of physical broadcast IDs
271 int get_physical_broadcast(void)
273 return modern_apic() ? 0xff : 0xf;
278 * lapic_get_maxlvt - get the maximum number of local vector table entries
280 int lapic_get_maxlvt(void)
284 v = apic_read(APIC_LVR);
286 * - we always have APIC integrated on 64bit mode
287 * - 82489DXs do not report # of LVT entries
289 return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2;
297 #define APIC_DIVISOR 16
300 * This function sets up the local APIC timer, with a timeout of
301 * 'clocks' APIC bus clock. During calibration we actually call
302 * this function twice on the boot CPU, once with a bogus timeout
303 * value, second time for real. The other (noncalibrating) CPUs
304 * call this function only once, with the real, calibrated value.
306 * We do reads before writes even if unnecessary, to get around the
307 * P5 APIC double write bug.
309 static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
311 unsigned int lvtt_value, tmp_value;
313 lvtt_value = LOCAL_TIMER_VECTOR;
315 lvtt_value |= APIC_LVT_TIMER_PERIODIC;
316 if (!lapic_is_integrated())
317 lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV);
320 lvtt_value |= APIC_LVT_MASKED;
322 apic_write(APIC_LVTT, lvtt_value);
327 tmp_value = apic_read(APIC_TDCR);
328 apic_write(APIC_TDCR,
329 (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) |
333 apic_write(APIC_TMICT, clocks / APIC_DIVISOR);
337 * Setup extended LVT, AMD specific (K8, family 10h)
339 * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and
340 * MCE interrupts are supported. Thus MCE offset must be set to 0.
342 * If mask=1, the LVT entry does not generate interrupts while mask=0
343 * enables the vector. See also the BKDGs.
346 #define APIC_EILVT_LVTOFF_MCE 0
347 #define APIC_EILVT_LVTOFF_IBS 1
349 static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask)
351 unsigned long reg = (lvt_off << 4) + APIC_EILVT0;
352 unsigned int v = (mask << 16) | (msg_type << 8) | vector;
357 u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask)
359 setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask);
360 return APIC_EILVT_LVTOFF_MCE;
363 u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask)
365 setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask);
366 return APIC_EILVT_LVTOFF_IBS;
368 EXPORT_SYMBOL_GPL(setup_APIC_eilvt_ibs);
371 * Program the next event, relative to now
373 static int lapic_next_event(unsigned long delta,
374 struct clock_event_device *evt)
376 apic_write(APIC_TMICT, delta);
381 * Setup the lapic timer in periodic or oneshot mode
383 static void lapic_timer_setup(enum clock_event_mode mode,
384 struct clock_event_device *evt)
389 /* Lapic used as dummy for broadcast ? */
390 if (evt->features & CLOCK_EVT_FEAT_DUMMY)
393 local_irq_save(flags);
396 case CLOCK_EVT_MODE_PERIODIC:
397 case CLOCK_EVT_MODE_ONESHOT:
398 __setup_APIC_LVTT(calibration_result,
399 mode != CLOCK_EVT_MODE_PERIODIC, 1);
401 case CLOCK_EVT_MODE_UNUSED:
402 case CLOCK_EVT_MODE_SHUTDOWN:
403 v = apic_read(APIC_LVTT);
404 v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
405 apic_write(APIC_LVTT, v);
406 apic_write(APIC_TMICT, 0xffffffff);
408 case CLOCK_EVT_MODE_RESUME:
409 /* Nothing to do here */
413 local_irq_restore(flags);
417 * Local APIC timer broadcast function
419 static void lapic_timer_broadcast(const struct cpumask *mask)
422 apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
427 * Setup the local APIC timer for this CPU. Copy the initilized values
428 * of the boot CPU and register the clock event in the framework.
430 static void __cpuinit setup_APIC_timer(void)
432 struct clock_event_device *levt = &__get_cpu_var(lapic_events);
434 memcpy(levt, &lapic_clockevent, sizeof(*levt));
435 levt->cpumask = cpumask_of(smp_processor_id());
437 clockevents_register_device(levt);
441 * In this functions we calibrate APIC bus clocks to the external timer.
443 * We want to do the calibration only once since we want to have local timer
444 * irqs syncron. CPUs connected by the same APIC bus have the very same bus
447 * This was previously done by reading the PIT/HPET and waiting for a wrap
448 * around to find out, that a tick has elapsed. I have a box, where the PIT
449 * readout is broken, so it never gets out of the wait loop again. This was
450 * also reported by others.
452 * Monitoring the jiffies value is inaccurate and the clockevents
453 * infrastructure allows us to do a simple substitution of the interrupt
456 * The calibration routine also uses the pm_timer when possible, as the PIT
457 * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes
458 * back to normal later in the boot process).
461 #define LAPIC_CAL_LOOPS (HZ/10)
463 static __initdata int lapic_cal_loops = -1;
464 static __initdata long lapic_cal_t1, lapic_cal_t2;
465 static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2;
466 static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2;
467 static __initdata unsigned long lapic_cal_j1, lapic_cal_j2;
470 * Temporary interrupt handler.
472 static void __init lapic_cal_handler(struct clock_event_device *dev)
474 unsigned long long tsc = 0;
475 long tapic = apic_read(APIC_TMCCT);
476 unsigned long pm = acpi_pm_read_early();
481 switch (lapic_cal_loops++) {
483 lapic_cal_t1 = tapic;
484 lapic_cal_tsc1 = tsc;
486 lapic_cal_j1 = jiffies;
489 case LAPIC_CAL_LOOPS:
490 lapic_cal_t2 = tapic;
491 lapic_cal_tsc2 = tsc;
492 if (pm < lapic_cal_pm1)
493 pm += ACPI_PM_OVRRUN;
495 lapic_cal_j2 = jiffies;
501 calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc)
503 const long pm_100ms = PMTMR_TICKS_PER_SEC / 10;
504 const long pm_thresh = pm_100ms / 100;
508 #ifndef CONFIG_X86_PM_TIMER
512 apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm);
514 /* Check, if the PM timer is available */
518 mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22);
520 if (deltapm > (pm_100ms - pm_thresh) &&
521 deltapm < (pm_100ms + pm_thresh)) {
522 apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n");
526 res = (((u64)deltapm) * mult) >> 22;
527 do_div(res, 1000000);
528 pr_warning("APIC calibration not consistent "
529 "with PM-Timer: %ldms instead of 100ms\n",(long)res);
531 /* Correct the lapic counter value */
532 res = (((u64)(*delta)) * pm_100ms);
533 do_div(res, deltapm);
534 pr_info("APIC delta adjusted to PM-Timer: "
535 "%lu (%ld)\n", (unsigned long)res, *delta);
538 /* Correct the tsc counter value */
540 res = (((u64)(*deltatsc)) * pm_100ms);
541 do_div(res, deltapm);
542 apic_printk(APIC_VERBOSE, "TSC delta adjusted to "
543 "PM-Timer: %lu (%ld) \n",
544 (unsigned long)res, *deltatsc);
545 *deltatsc = (long)res;
551 static int __init calibrate_APIC_clock(void)
553 struct clock_event_device *levt = &__get_cpu_var(lapic_events);
554 void (*real_handler)(struct clock_event_device *dev);
555 unsigned long deltaj;
556 long delta, deltatsc;
557 int pm_referenced = 0;
561 /* Replace the global interrupt handler */
562 real_handler = global_clock_event->event_handler;
563 global_clock_event->event_handler = lapic_cal_handler;
566 * Setup the APIC counter to maximum. There is no way the lapic
567 * can underflow in the 100ms detection time frame
569 __setup_APIC_LVTT(0xffffffff, 0, 0);
571 /* Let the interrupts run */
574 while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
579 /* Restore the real event handler */
580 global_clock_event->event_handler = real_handler;
582 /* Build delta t1-t2 as apic timer counts down */
583 delta = lapic_cal_t1 - lapic_cal_t2;
584 apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta);
586 deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1);
588 /* we trust the PM based calibration if possible */
589 pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1,
592 /* Calculate the scaled math multiplication factor */
593 lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
594 lapic_clockevent.shift);
595 lapic_clockevent.max_delta_ns =
596 clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
597 lapic_clockevent.min_delta_ns =
598 clockevent_delta2ns(0xF, &lapic_clockevent);
600 calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
602 apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
603 apic_printk(APIC_VERBOSE, "..... mult: %ld\n", lapic_clockevent.mult);
604 apic_printk(APIC_VERBOSE, "..... calibration result: %u\n",
608 apic_printk(APIC_VERBOSE, "..... CPU clock speed is "
610 (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ),
611 (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ));
614 apic_printk(APIC_VERBOSE, "..... host bus clock speed is "
616 calibration_result / (1000000 / HZ),
617 calibration_result % (1000000 / HZ));
620 * Do a sanity check on the APIC calibration result
622 if (calibration_result < (1000000 / HZ)) {
624 pr_warning("APIC frequency too slow, disabling apic timer\n");
628 levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
631 * PM timer calibration failed or not turned on
632 * so lets try APIC timer based calibration
634 if (!pm_referenced) {
635 apic_printk(APIC_VERBOSE, "... verify APIC timer\n");
638 * Setup the apic timer manually
640 levt->event_handler = lapic_cal_handler;
641 lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt);
642 lapic_cal_loops = -1;
644 /* Let the interrupts run */
647 while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
650 /* Stop the lapic timer */
651 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt);
654 deltaj = lapic_cal_j2 - lapic_cal_j1;
655 apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj);
657 /* Check, if the jiffies result is consistent */
658 if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2)
659 apic_printk(APIC_VERBOSE, "... jiffies result ok\n");
661 levt->features |= CLOCK_EVT_FEAT_DUMMY;
665 if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
666 pr_warning("APIC timer disabled due to verification failure\n");
674 * Setup the boot APIC
676 * Calibrate and verify the result.
678 void __init setup_boot_APIC_clock(void)
681 * The local apic timer can be disabled via the kernel
682 * commandline or from the CPU detection code. Register the lapic
683 * timer as a dummy clock event source on SMP systems, so the
684 * broadcast mechanism is used. On UP systems simply ignore it.
686 if (disable_apic_timer) {
687 pr_info("Disabling APIC timer\n");
688 /* No broadcast on UP ! */
689 if (num_possible_cpus() > 1) {
690 lapic_clockevent.mult = 1;
696 apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n"
697 "calibrating APIC timer ...\n");
699 if (calibrate_APIC_clock()) {
700 /* No broadcast on UP ! */
701 if (num_possible_cpus() > 1)
707 * If nmi_watchdog is set to IO_APIC, we need the
708 * PIT/HPET going. Otherwise register lapic as a dummy
711 if (nmi_watchdog != NMI_IO_APIC)
712 lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
714 pr_warning("APIC timer registered as dummy,"
715 " due to nmi_watchdog=%d!\n", nmi_watchdog);
717 /* Setup the lapic or request the broadcast */
721 void __cpuinit setup_secondary_APIC_clock(void)
727 * The guts of the apic timer interrupt
729 static void local_apic_timer_interrupt(void)
731 int cpu = smp_processor_id();
732 struct clock_event_device *evt = &per_cpu(lapic_events, cpu);
735 * Normally we should not be here till LAPIC has been initialized but
736 * in some cases like kdump, its possible that there is a pending LAPIC
737 * timer interrupt from previous kernel's context and is delivered in
738 * new kernel the moment interrupts are enabled.
740 * Interrupts are enabled early and LAPIC is setup much later, hence
741 * its possible that when we get here evt->event_handler is NULL.
742 * Check for event_handler being NULL and discard the interrupt as
745 if (!evt->event_handler) {
746 pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu);
748 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt);
753 * the NMI deadlock-detector uses this.
755 inc_irq_stat(apic_timer_irqs);
757 evt->event_handler(evt);
761 * Local APIC timer interrupt. This is the most natural way for doing
762 * local interrupts, but local timer interrupts can be emulated by
763 * broadcast interrupts too. [in case the hw doesn't support APIC timers]
765 * [ if a single-CPU system runs an SMP kernel then we call the local
766 * interrupt as well. Thus we cannot inline the local irq ... ]
768 void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs)
770 struct pt_regs *old_regs = set_irq_regs(regs);
773 * NOTE! We'd better ACK the irq immediately,
774 * because timer handling can be slow.
778 * update_process_times() expects us to have done irq_enter().
779 * Besides, if we don't timer interrupts ignore the global
780 * interrupt lock, which is the WrongThing (tm) to do.
784 local_apic_timer_interrupt();
787 set_irq_regs(old_regs);
790 int setup_profiling_timer(unsigned int multiplier)
796 * Local APIC start and shutdown
800 * clear_local_APIC - shutdown the local APIC
802 * This is called, when a CPU is disabled and before rebooting, so the state of
803 * the local APIC has no dangling leftovers. Also used to cleanout any BIOS
804 * leftovers during boot.
806 void clear_local_APIC(void)
811 /* APIC hasn't been mapped yet */
812 if (!x2apic && !apic_phys)
815 maxlvt = lapic_get_maxlvt();
817 * Masking an LVT entry can trigger a local APIC error
818 * if the vector is zero. Mask LVTERR first to prevent this.
821 v = ERROR_APIC_VECTOR; /* any non-zero vector will do */
822 apic_write(APIC_LVTERR, v | APIC_LVT_MASKED);
825 * Careful: we have to set masks only first to deassert
826 * any level-triggered sources.
828 v = apic_read(APIC_LVTT);
829 apic_write(APIC_LVTT, v | APIC_LVT_MASKED);
830 v = apic_read(APIC_LVT0);
831 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
832 v = apic_read(APIC_LVT1);
833 apic_write(APIC_LVT1, v | APIC_LVT_MASKED);
835 v = apic_read(APIC_LVTPC);
836 apic_write(APIC_LVTPC, v | APIC_LVT_MASKED);
839 /* lets not touch this if we didn't frob it */
840 #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL)
842 v = apic_read(APIC_LVTTHMR);
843 apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED);
846 #ifdef CONFIG_X86_MCE_INTEL
848 v = apic_read(APIC_LVTCMCI);
849 if (!(v & APIC_LVT_MASKED))
850 apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED);
855 * Clean APIC state for other OSs:
857 apic_write(APIC_LVTT, APIC_LVT_MASKED);
858 apic_write(APIC_LVT0, APIC_LVT_MASKED);
859 apic_write(APIC_LVT1, APIC_LVT_MASKED);
861 apic_write(APIC_LVTERR, APIC_LVT_MASKED);
863 apic_write(APIC_LVTPC, APIC_LVT_MASKED);
865 /* Integrated APIC (!82489DX) ? */
866 if (lapic_is_integrated()) {
868 /* Clear ESR due to Pentium errata 3AP and 11AP */
869 apic_write(APIC_ESR, 0);
875 * disable_local_APIC - clear and disable the local APIC
877 void disable_local_APIC(void)
881 /* APIC hasn't been mapped yet */
888 * Disable APIC (implies clearing of registers
891 value = apic_read(APIC_SPIV);
892 value &= ~APIC_SPIV_APIC_ENABLED;
893 apic_write(APIC_SPIV, value);
897 * When LAPIC was disabled by the BIOS and enabled by the kernel,
898 * restore the disabled state.
900 if (enabled_via_apicbase) {
903 rdmsr(MSR_IA32_APICBASE, l, h);
904 l &= ~MSR_IA32_APICBASE_ENABLE;
905 wrmsr(MSR_IA32_APICBASE, l, h);
911 * If Linux enabled the LAPIC against the BIOS default disable it down before
912 * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and
913 * not power-off. Additionally clear all LVT entries before disable_local_APIC
914 * for the case where Linux didn't enable the LAPIC.
916 void lapic_shutdown(void)
923 local_irq_save(flags);
926 if (!enabled_via_apicbase)
930 disable_local_APIC();
933 local_irq_restore(flags);
937 * This is to verify that we're looking at a real local APIC.
938 * Check these against your board if the CPUs aren't getting
939 * started for no apparent reason.
941 int __init verify_local_APIC(void)
943 unsigned int reg0, reg1;
946 * The version register is read-only in a real APIC.
948 reg0 = apic_read(APIC_LVR);
949 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0);
950 apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK);
951 reg1 = apic_read(APIC_LVR);
952 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1);
955 * The two version reads above should print the same
956 * numbers. If the second one is different, then we
957 * poke at a non-APIC.
963 * Check if the version looks reasonably.
965 reg1 = GET_APIC_VERSION(reg0);
966 if (reg1 == 0x00 || reg1 == 0xff)
968 reg1 = lapic_get_maxlvt();
969 if (reg1 < 0x02 || reg1 == 0xff)
973 * The ID register is read/write in a real APIC.
975 reg0 = apic_read(APIC_ID);
976 apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
977 apic_write(APIC_ID, reg0 ^ apic->apic_id_mask);
978 reg1 = apic_read(APIC_ID);
979 apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1);
980 apic_write(APIC_ID, reg0);
981 if (reg1 != (reg0 ^ apic->apic_id_mask))
985 * The next two are just to see if we have sane values.
986 * They're only really relevant if we're in Virtual Wire
987 * compatibility mode, but most boxes are anymore.
989 reg0 = apic_read(APIC_LVT0);
990 apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0);
991 reg1 = apic_read(APIC_LVT1);
992 apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1);
998 * sync_Arb_IDs - synchronize APIC bus arbitration IDs
1000 void __init sync_Arb_IDs(void)
1003 * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
1006 if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
1012 apic_wait_icr_idle();
1014 apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n");
1015 apic_write(APIC_ICR, APIC_DEST_ALLINC |
1016 APIC_INT_LEVELTRIG | APIC_DM_INIT);
1020 * An initial setup of the virtual wire mode.
1022 void __init init_bsp_APIC(void)
1027 * Don't do the setup now if we have a SMP BIOS as the
1028 * through-I/O-APIC virtual wire mode might be active.
1030 if (smp_found_config || !cpu_has_apic)
1034 * Do not trust the local APIC being empty at bootup.
1041 value = apic_read(APIC_SPIV);
1042 value &= ~APIC_VECTOR_MASK;
1043 value |= APIC_SPIV_APIC_ENABLED;
1045 #ifdef CONFIG_X86_32
1046 /* This bit is reserved on P4/Xeon and should be cleared */
1047 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
1048 (boot_cpu_data.x86 == 15))
1049 value &= ~APIC_SPIV_FOCUS_DISABLED;
1052 value |= APIC_SPIV_FOCUS_DISABLED;
1053 value |= SPURIOUS_APIC_VECTOR;
1054 apic_write(APIC_SPIV, value);
1057 * Set up the virtual wire mode.
1059 apic_write(APIC_LVT0, APIC_DM_EXTINT);
1060 value = APIC_DM_NMI;
1061 if (!lapic_is_integrated()) /* 82489DX */
1062 value |= APIC_LVT_LEVEL_TRIGGER;
1063 apic_write(APIC_LVT1, value);
1066 static void __cpuinit lapic_setup_esr(void)
1068 unsigned int oldvalue, value, maxlvt;
1070 if (!lapic_is_integrated()) {
1071 pr_info("No ESR for 82489DX.\n");
1075 if (apic->disable_esr) {
1077 * Something untraceable is creating bad interrupts on
1078 * secondary quads ... for the moment, just leave the
1079 * ESR disabled - we can't do anything useful with the
1080 * errors anyway - mbligh
1082 pr_info("Leaving ESR disabled.\n");
1086 maxlvt = lapic_get_maxlvt();
1087 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
1088 apic_write(APIC_ESR, 0);
1089 oldvalue = apic_read(APIC_ESR);
1091 /* enables sending errors */
1092 value = ERROR_APIC_VECTOR;
1093 apic_write(APIC_LVTERR, value);
1096 * spec says clear errors after enabling vector.
1099 apic_write(APIC_ESR, 0);
1100 value = apic_read(APIC_ESR);
1101 if (value != oldvalue)
1102 apic_printk(APIC_VERBOSE, "ESR value before enabling "
1103 "vector: 0x%08x after: 0x%08x\n",
1109 * setup_local_APIC - setup the local APIC
1111 void __cpuinit setup_local_APIC(void)
1117 arch_disable_smp_support();
1121 #ifdef CONFIG_X86_32
1122 /* Pound the ESR really hard over the head with a big hammer - mbligh */
1123 if (lapic_is_integrated() && apic->disable_esr) {
1124 apic_write(APIC_ESR, 0);
1125 apic_write(APIC_ESR, 0);
1126 apic_write(APIC_ESR, 0);
1127 apic_write(APIC_ESR, 0);
1134 * Double-check whether this APIC is really registered.
1135 * This is meaningless in clustered apic mode, so we skip it.
1137 if (!apic->apic_id_registered())
1141 * Intel recommends to set DFR, LDR and TPR before enabling
1142 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
1143 * document number 292116). So here it goes...
1145 apic->init_apic_ldr();
1148 * Set Task Priority to 'accept all'. We never change this
1151 value = apic_read(APIC_TASKPRI);
1152 value &= ~APIC_TPRI_MASK;
1153 apic_write(APIC_TASKPRI, value);
1156 * After a crash, we no longer service the interrupts and a pending
1157 * interrupt from previous kernel might still have ISR bit set.
1159 * Most probably by now CPU has serviced that pending interrupt and
1160 * it might not have done the ack_APIC_irq() because it thought,
1161 * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it
1162 * does not clear the ISR bit and cpu thinks it has already serivced
1163 * the interrupt. Hence a vector might get locked. It was noticed
1164 * for timer irq (vector 0x31). Issue an extra EOI to clear ISR.
1166 for (i = APIC_ISR_NR - 1; i >= 0; i--) {
1167 value = apic_read(APIC_ISR + i*0x10);
1168 for (j = 31; j >= 0; j--) {
1175 * Now that we are all set up, enable the APIC
1177 value = apic_read(APIC_SPIV);
1178 value &= ~APIC_VECTOR_MASK;
1182 value |= APIC_SPIV_APIC_ENABLED;
1184 #ifdef CONFIG_X86_32
1186 * Some unknown Intel IO/APIC (or APIC) errata is biting us with
1187 * certain networking cards. If high frequency interrupts are
1188 * happening on a particular IOAPIC pin, plus the IOAPIC routing
1189 * entry is masked/unmasked at a high rate as well then sooner or
1190 * later IOAPIC line gets 'stuck', no more interrupts are received
1191 * from the device. If focus CPU is disabled then the hang goes
1194 * [ This bug can be reproduced easily with a level-triggered
1195 * PCI Ne2000 networking cards and PII/PIII processors, dual
1199 * Actually disabling the focus CPU check just makes the hang less
1200 * frequent as it makes the interrupt distributon model be more
1201 * like LRU than MRU (the short-term load is more even across CPUs).
1202 * See also the comment in end_level_ioapic_irq(). --macro
1206 * - enable focus processor (bit==0)
1207 * - 64bit mode always use processor focus
1208 * so no need to set it
1210 value &= ~APIC_SPIV_FOCUS_DISABLED;
1214 * Set spurious IRQ vector
1216 value |= SPURIOUS_APIC_VECTOR;
1217 apic_write(APIC_SPIV, value);
1220 * Set up LVT0, LVT1:
1222 * set up through-local-APIC on the BP's LINT0. This is not
1223 * strictly necessary in pure symmetric-IO mode, but sometimes
1224 * we delegate interrupts to the 8259A.
1227 * TODO: set up through-local-APIC from through-I/O-APIC? --macro
1229 value = apic_read(APIC_LVT0) & APIC_LVT_MASKED;
1230 if (!smp_processor_id() && (pic_mode || !value)) {
1231 value = APIC_DM_EXTINT;
1232 apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n",
1233 smp_processor_id());
1235 value = APIC_DM_EXTINT | APIC_LVT_MASKED;
1236 apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n",
1237 smp_processor_id());
1239 apic_write(APIC_LVT0, value);
1242 * only the BP should see the LINT1 NMI signal, obviously.
1244 if (!smp_processor_id())
1245 value = APIC_DM_NMI;
1247 value = APIC_DM_NMI | APIC_LVT_MASKED;
1248 if (!lapic_is_integrated()) /* 82489DX */
1249 value |= APIC_LVT_LEVEL_TRIGGER;
1250 apic_write(APIC_LVT1, value);
1254 #ifdef CONFIG_X86_MCE_INTEL
1255 /* Recheck CMCI information after local APIC is up on CPU #0 */
1256 if (smp_processor_id() == 0)
1261 void __cpuinit end_local_APIC_setup(void)
1265 #ifdef CONFIG_X86_32
1268 /* Disable the local apic timer */
1269 value = apic_read(APIC_LVTT);
1270 value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
1271 apic_write(APIC_LVTT, value);
1275 setup_apic_nmi_watchdog(NULL);
1279 #ifdef CONFIG_X86_X2APIC
1280 void check_x2apic(void)
1282 if (x2apic_enabled()) {
1283 pr_info("x2apic enabled by BIOS, switching to x2apic ops\n");
1284 x2apic_preenabled = x2apic = 1;
1288 void enable_x2apic(void)
1295 rdmsr(MSR_IA32_APICBASE, msr, msr2);
1296 if (!(msr & X2APIC_ENABLE)) {
1297 pr_info("Enabling x2apic\n");
1298 wrmsr(MSR_IA32_APICBASE, msr | X2APIC_ENABLE, 0);
1302 void __init enable_IR_x2apic(void)
1304 #ifdef CONFIG_INTR_REMAP
1306 unsigned long flags;
1307 struct IO_APIC_route_entry **ioapic_entries = NULL;
1309 if (!cpu_has_x2apic)
1312 if (!x2apic_preenabled && disable_x2apic) {
1313 pr_info("Skipped enabling x2apic and Interrupt-remapping "
1314 "because of nox2apic\n");
1318 if (x2apic_preenabled && disable_x2apic)
1319 panic("Bios already enabled x2apic, can't enforce nox2apic");
1321 if (!x2apic_preenabled && skip_ioapic_setup) {
1322 pr_info("Skipped enabling x2apic and Interrupt-remapping "
1323 "because of skipping io-apic setup\n");
1327 ret = dmar_table_init();
1329 pr_info("dmar_table_init() failed with %d:\n", ret);
1331 if (x2apic_preenabled)
1332 panic("x2apic enabled by bios. But IR enabling failed");
1334 pr_info("Not enabling x2apic,Intr-remapping\n");
1338 ioapic_entries = alloc_ioapic_entries();
1339 if (!ioapic_entries) {
1340 pr_info("Allocate ioapic_entries failed: %d\n", ret);
1344 ret = save_IO_APIC_setup(ioapic_entries);
1346 pr_info("Saving IO-APIC state failed: %d\n", ret);
1350 local_irq_save(flags);
1351 mask_IO_APIC_setup(ioapic_entries);
1354 ret = enable_intr_remapping(EIM_32BIT_APIC_ID);
1356 if (ret && x2apic_preenabled) {
1357 local_irq_restore(flags);
1358 panic("x2apic enabled by bios. But IR enabling failed");
1372 * IR enabling failed
1374 restore_IO_APIC_setup(ioapic_entries);
1376 reinit_intr_remapped_IO_APIC(x2apic_preenabled, ioapic_entries);
1379 local_irq_restore(flags);
1383 if (!x2apic_preenabled)
1384 pr_info("Enabled x2apic and interrupt-remapping\n");
1386 pr_info("Enabled Interrupt-remapping\n");
1388 pr_err("Failed to enable Interrupt-remapping and x2apic\n");
1390 free_ioapic_entries(ioapic_entries);
1392 if (!cpu_has_x2apic)
1395 if (x2apic_preenabled)
1396 panic("x2apic enabled prior OS handover,"
1397 " enable CONFIG_INTR_REMAP");
1399 pr_info("Enable CONFIG_INTR_REMAP for enabling intr-remapping "
1405 #endif /* CONFIG_X86_X2APIC */
1407 #ifdef CONFIG_X86_64
1409 * Detect and enable local APICs on non-SMP boards.
1410 * Original code written by Keir Fraser.
1411 * On AMD64 we trust the BIOS - if it says no APIC it is likely
1412 * not correctly set up (usually the APIC timer won't work etc.)
1414 static int __init detect_init_APIC(void)
1416 if (!cpu_has_apic) {
1417 pr_info("No local APIC present\n");
1421 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
1422 boot_cpu_physical_apicid = 0;
1427 * Detect and initialize APIC
1429 static int __init detect_init_APIC(void)
1433 /* Disabled by kernel option? */
1437 switch (boot_cpu_data.x86_vendor) {
1438 case X86_VENDOR_AMD:
1439 if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) ||
1440 (boot_cpu_data.x86 >= 15))
1443 case X86_VENDOR_INTEL:
1444 if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 ||
1445 (boot_cpu_data.x86 == 5 && cpu_has_apic))
1452 if (!cpu_has_apic) {
1454 * Over-ride BIOS and try to enable the local APIC only if
1455 * "lapic" specified.
1457 if (!force_enable_local_apic) {
1458 pr_info("Local APIC disabled by BIOS -- "
1459 "you can enable it with \"lapic\"\n");
1463 * Some BIOSes disable the local APIC in the APIC_BASE
1464 * MSR. This can only be done in software for Intel P6 or later
1465 * and AMD K7 (Model > 1) or later.
1467 rdmsr(MSR_IA32_APICBASE, l, h);
1468 if (!(l & MSR_IA32_APICBASE_ENABLE)) {
1469 pr_info("Local APIC disabled by BIOS -- reenabling.\n");
1470 l &= ~MSR_IA32_APICBASE_BASE;
1471 l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE;
1472 wrmsr(MSR_IA32_APICBASE, l, h);
1473 enabled_via_apicbase = 1;
1477 * The APIC feature bit should now be enabled
1480 features = cpuid_edx(1);
1481 if (!(features & (1 << X86_FEATURE_APIC))) {
1482 pr_warning("Could not enable APIC!\n");
1485 set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
1486 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
1488 /* The BIOS may have set up the APIC at some other address */
1489 rdmsr(MSR_IA32_APICBASE, l, h);
1490 if (l & MSR_IA32_APICBASE_ENABLE)
1491 mp_lapic_addr = l & MSR_IA32_APICBASE_BASE;
1493 pr_info("Found and enabled local APIC!\n");
1500 pr_info("No local APIC present or hardware disabled\n");
1505 #ifdef CONFIG_X86_64
1506 void __init early_init_lapic_mapping(void)
1508 unsigned long phys_addr;
1511 * If no local APIC can be found then go out
1512 * : it means there is no mpatable and MADT
1514 if (!smp_found_config)
1517 phys_addr = mp_lapic_addr;
1519 set_fixmap_nocache(FIX_APIC_BASE, phys_addr);
1520 apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
1521 APIC_BASE, phys_addr);
1524 * Fetch the APIC ID of the BSP in case we have a
1525 * default configuration (or the MP table is broken).
1527 boot_cpu_physical_apicid = read_apic_id();
1532 * init_apic_mappings - initialize APIC mappings
1534 void __init init_apic_mappings(void)
1537 boot_cpu_physical_apicid = read_apic_id();
1542 * If no local APIC can be found then set up a fake all
1543 * zeroes page to simulate the local APIC and another
1544 * one for the IO-APIC.
1546 if (!smp_found_config && detect_init_APIC()) {
1547 apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
1548 apic_phys = __pa(apic_phys);
1550 apic_phys = mp_lapic_addr;
1552 set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
1553 apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n",
1554 APIC_BASE, apic_phys);
1557 * Fetch the APIC ID of the BSP in case we have a
1558 * default configuration (or the MP table is broken).
1560 if (boot_cpu_physical_apicid == -1U)
1561 boot_cpu_physical_apicid = read_apic_id();
1565 * This initializes the IO-APIC and APIC hardware if this is
1568 int apic_version[MAX_APICS];
1570 int __init APIC_init_uniprocessor(void)
1573 pr_info("Apic disabled\n");
1576 #ifdef CONFIG_X86_64
1577 if (!cpu_has_apic) {
1579 pr_info("Apic disabled by BIOS\n");
1583 if (!smp_found_config && !cpu_has_apic)
1587 * Complain if the BIOS pretends there is one.
1589 if (!cpu_has_apic &&
1590 APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
1591 pr_err("BIOS bug, local APIC 0x%x not detected!...\n",
1592 boot_cpu_physical_apicid);
1593 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
1599 #ifdef CONFIG_X86_64
1600 default_setup_apic_routing();
1603 verify_local_APIC();
1606 #ifdef CONFIG_X86_64
1607 apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid));
1610 * Hack: In case of kdump, after a crash, kernel might be booting
1611 * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid
1612 * might be zero if read from MP tables. Get it from LAPIC.
1614 # ifdef CONFIG_CRASH_DUMP
1615 boot_cpu_physical_apicid = read_apic_id();
1618 physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
1621 #ifdef CONFIG_X86_IO_APIC
1623 * Now enable IO-APICs, actually call clear_IO_APIC
1624 * We need clear_IO_APIC before enabling error vector
1626 if (!skip_ioapic_setup && nr_ioapics)
1630 end_local_APIC_setup();
1632 #ifdef CONFIG_X86_IO_APIC
1633 if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
1637 localise_nmi_watchdog();
1640 localise_nmi_watchdog();
1644 #ifdef CONFIG_X86_64
1645 check_nmi_watchdog();
1652 * Local APIC interrupts
1656 * This interrupt should _never_ happen with our APIC/SMP architecture
1658 void smp_spurious_interrupt(struct pt_regs *regs)
1665 * Check if this really is a spurious interrupt and ACK it
1666 * if it is a vectored one. Just in case...
1667 * Spurious interrupts should not be ACKed.
1669 v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1));
1670 if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f)))
1673 inc_irq_stat(irq_spurious_count);
1675 /* see sw-dev-man vol 3, chapter 7.4.13.5 */
1676 pr_info("spurious APIC interrupt on CPU#%d, "
1677 "should never happen.\n", smp_processor_id());
1682 * This interrupt should never happen with our APIC/SMP architecture
1684 void smp_error_interrupt(struct pt_regs *regs)
1690 /* First tickle the hardware, only then report what went on. -- REW */
1691 v = apic_read(APIC_ESR);
1692 apic_write(APIC_ESR, 0);
1693 v1 = apic_read(APIC_ESR);
1695 atomic_inc(&irq_err_count);
1698 * Here is what the APIC error bits mean:
1700 * 1: Receive CS error
1701 * 2: Send accept error
1702 * 3: Receive accept error
1704 * 5: Send illegal vector
1705 * 6: Received illegal vector
1706 * 7: Illegal register address
1708 pr_debug("APIC error on CPU%d: %02x(%02x)\n",
1709 smp_processor_id(), v , v1);
1714 * connect_bsp_APIC - attach the APIC to the interrupt system
1716 void __init connect_bsp_APIC(void)
1718 #ifdef CONFIG_X86_32
1721 * Do not trust the local APIC being empty at bootup.
1725 * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's
1726 * local APIC to INT and NMI lines.
1728 apic_printk(APIC_VERBOSE, "leaving PIC mode, "
1729 "enabling APIC mode.\n");
1734 if (apic->enable_apic_mode)
1735 apic->enable_apic_mode();
1739 * disconnect_bsp_APIC - detach the APIC from the interrupt system
1740 * @virt_wire_setup: indicates, whether virtual wire mode is selected
1742 * Virtual wire mode is necessary to deliver legacy interrupts even when the
1745 void disconnect_bsp_APIC(int virt_wire_setup)
1749 #ifdef CONFIG_X86_32
1752 * Put the board back into PIC mode (has an effect only on
1753 * certain older boards). Note that APIC interrupts, including
1754 * IPIs, won't work beyond this point! The only exception are
1757 apic_printk(APIC_VERBOSE, "disabling APIC mode, "
1758 "entering PIC mode.\n");
1765 /* Go back to Virtual Wire compatibility mode */
1767 /* For the spurious interrupt use vector F, and enable it */
1768 value = apic_read(APIC_SPIV);
1769 value &= ~APIC_VECTOR_MASK;
1770 value |= APIC_SPIV_APIC_ENABLED;
1772 apic_write(APIC_SPIV, value);
1774 if (!virt_wire_setup) {
1776 * For LVT0 make it edge triggered, active high,
1777 * external and enabled
1779 value = apic_read(APIC_LVT0);
1780 value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
1781 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
1782 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
1783 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
1784 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
1785 apic_write(APIC_LVT0, value);
1788 apic_write(APIC_LVT0, APIC_LVT_MASKED);
1792 * For LVT1 make it edge triggered, active high,
1795 value = apic_read(APIC_LVT1);
1796 value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
1797 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
1798 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
1799 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
1800 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
1801 apic_write(APIC_LVT1, value);
1804 void __cpuinit generic_processor_info(int apicid, int version)
1811 if (version == 0x0) {
1812 pr_warning("BIOS bug, APIC version is 0 for CPU#%d! "
1813 "fixing up to 0x10. (tell your hw vendor)\n",
1817 apic_version[apicid] = version;
1819 if (num_processors >= nr_cpu_ids) {
1820 int max = nr_cpu_ids;
1821 int thiscpu = max + disabled_cpus;
1824 "ACPI: NR_CPUS/possible_cpus limit of %i reached."
1825 " Processor %d/0x%x ignored.\n", max, thiscpu, apicid);
1832 cpu = cpumask_next_zero(-1, cpu_present_mask);
1834 if (version != apic_version[boot_cpu_physical_apicid])
1836 "ACPI: apic version mismatch, bootcpu: %x cpu %d: %x\n",
1837 apic_version[boot_cpu_physical_apicid], cpu, version);
1839 physid_set(apicid, phys_cpu_present_map);
1840 if (apicid == boot_cpu_physical_apicid) {
1842 * x86_bios_cpu_apicid is required to have processors listed
1843 * in same order as logical cpu numbers. Hence the first
1844 * entry is BSP, and so on.
1848 if (apicid > max_physical_apicid)
1849 max_physical_apicid = apicid;
1851 #ifdef CONFIG_X86_32
1853 * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
1854 * but we need to work other dependencies like SMP_SUSPEND etc
1855 * before this can be done without some confusion.
1856 * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
1857 * - Ashok Raj <ashok.raj@intel.com>
1859 if (max_physical_apicid >= 8) {
1860 switch (boot_cpu_data.x86_vendor) {
1861 case X86_VENDOR_INTEL:
1862 if (!APIC_XAPIC(version)) {
1866 /* If P4 and above fall through */
1867 case X86_VENDOR_AMD:
1873 #if defined(CONFIG_SMP) || defined(CONFIG_X86_64)
1874 early_per_cpu(x86_cpu_to_apicid, cpu) = apicid;
1875 early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
1878 set_cpu_possible(cpu, true);
1879 set_cpu_present(cpu, true);
1882 int hard_smp_processor_id(void)
1884 return read_apic_id();
1887 void default_init_apic_ldr(void)
1891 apic_write(APIC_DFR, APIC_DFR_VALUE);
1892 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
1893 val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
1894 apic_write(APIC_LDR, val);
1897 #ifdef CONFIG_X86_32
1898 int default_apicid_to_node(int logical_apicid)
1901 return apicid_2_node[hard_smp_processor_id()];
1915 * 'active' is true if the local APIC was enabled by us and
1916 * not the BIOS; this signifies that we are also responsible
1917 * for disabling it before entering apm/acpi suspend
1920 /* r/w apic fields */
1921 unsigned int apic_id;
1922 unsigned int apic_taskpri;
1923 unsigned int apic_ldr;
1924 unsigned int apic_dfr;
1925 unsigned int apic_spiv;
1926 unsigned int apic_lvtt;
1927 unsigned int apic_lvtpc;
1928 unsigned int apic_lvt0;
1929 unsigned int apic_lvt1;
1930 unsigned int apic_lvterr;
1931 unsigned int apic_tmict;
1932 unsigned int apic_tdcr;
1933 unsigned int apic_thmr;
1936 static int lapic_suspend(struct sys_device *dev, pm_message_t state)
1938 unsigned long flags;
1941 if (!apic_pm_state.active)
1944 maxlvt = lapic_get_maxlvt();
1946 apic_pm_state.apic_id = apic_read(APIC_ID);
1947 apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI);
1948 apic_pm_state.apic_ldr = apic_read(APIC_LDR);
1949 apic_pm_state.apic_dfr = apic_read(APIC_DFR);
1950 apic_pm_state.apic_spiv = apic_read(APIC_SPIV);
1951 apic_pm_state.apic_lvtt = apic_read(APIC_LVTT);
1953 apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC);
1954 apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0);
1955 apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1);
1956 apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR);
1957 apic_pm_state.apic_tmict = apic_read(APIC_TMICT);
1958 apic_pm_state.apic_tdcr = apic_read(APIC_TDCR);
1959 #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL)
1961 apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR);
1964 local_irq_save(flags);
1965 disable_local_APIC();
1966 #ifdef CONFIG_INTR_REMAP
1967 if (intr_remapping_enabled)
1968 disable_intr_remapping();
1970 local_irq_restore(flags);
1974 static int lapic_resume(struct sys_device *dev)
1977 unsigned long flags;
1980 #ifdef CONFIG_INTR_REMAP
1982 struct IO_APIC_route_entry **ioapic_entries = NULL;
1984 if (!apic_pm_state.active)
1987 local_irq_save(flags);
1989 ioapic_entries = alloc_ioapic_entries();
1990 if (!ioapic_entries) {
1991 WARN(1, "Alloc ioapic_entries in lapic resume failed.");
1995 ret = save_IO_APIC_setup(ioapic_entries);
1997 WARN(1, "Saving IO-APIC state failed: %d\n", ret);
1998 free_ioapic_entries(ioapic_entries);
2002 mask_IO_APIC_setup(ioapic_entries);
2007 if (!apic_pm_state.active)
2010 local_irq_save(flags);
2017 * Make sure the APICBASE points to the right address
2019 * FIXME! This will be wrong if we ever support suspend on
2020 * SMP! We'll need to do this as part of the CPU restore!
2022 rdmsr(MSR_IA32_APICBASE, l, h);
2023 l &= ~MSR_IA32_APICBASE_BASE;
2024 l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
2025 wrmsr(MSR_IA32_APICBASE, l, h);
2028 maxlvt = lapic_get_maxlvt();
2029 apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED);
2030 apic_write(APIC_ID, apic_pm_state.apic_id);
2031 apic_write(APIC_DFR, apic_pm_state.apic_dfr);
2032 apic_write(APIC_LDR, apic_pm_state.apic_ldr);
2033 apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri);
2034 apic_write(APIC_SPIV, apic_pm_state.apic_spiv);
2035 apic_write(APIC_LVT0, apic_pm_state.apic_lvt0);
2036 apic_write(APIC_LVT1, apic_pm_state.apic_lvt1);
2037 #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL)
2039 apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr);
2042 apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc);
2043 apic_write(APIC_LVTT, apic_pm_state.apic_lvtt);
2044 apic_write(APIC_TDCR, apic_pm_state.apic_tdcr);
2045 apic_write(APIC_TMICT, apic_pm_state.apic_tmict);
2046 apic_write(APIC_ESR, 0);
2047 apic_read(APIC_ESR);
2048 apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr);
2049 apic_write(APIC_ESR, 0);
2050 apic_read(APIC_ESR);
2052 #ifdef CONFIG_INTR_REMAP
2053 if (intr_remapping_enabled)
2054 reenable_intr_remapping(EIM_32BIT_APIC_ID);
2058 restore_IO_APIC_setup(ioapic_entries);
2059 free_ioapic_entries(ioapic_entries);
2063 local_irq_restore(flags);
2070 * This device has no shutdown method - fully functioning local APICs
2071 * are needed on every CPU up until machine_halt/restart/poweroff.
2074 static struct sysdev_class lapic_sysclass = {
2076 .resume = lapic_resume,
2077 .suspend = lapic_suspend,
2080 static struct sys_device device_lapic = {
2082 .cls = &lapic_sysclass,
2085 static void __cpuinit apic_pm_activate(void)
2087 apic_pm_state.active = 1;
2090 static int __init init_lapic_sysfs(void)
2096 /* XXX: remove suspend/resume procs if !apic_pm_state.active? */
2098 error = sysdev_class_register(&lapic_sysclass);
2100 error = sysdev_register(&device_lapic);
2104 /* local apic needs to resume before other devices access its registers. */
2105 core_initcall(init_lapic_sysfs);
2107 #else /* CONFIG_PM */
2109 static void apic_pm_activate(void) { }
2111 #endif /* CONFIG_PM */
2113 #ifdef CONFIG_X86_64
2115 * apic_is_clustered_box() -- Check if we can expect good TSC
2117 * Thus far, the major user of this is IBM's Summit2 series:
2119 * Clustered boxes may have unsynced TSC problems if they are
2120 * multi-chassis. Use available data to take a good guess.
2121 * If in doubt, go HPET.
2123 __cpuinit int apic_is_clustered_box(void)
2125 int i, clusters, zeros;
2127 u16 *bios_cpu_apicid;
2128 DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS);
2131 * there is not this kind of box with AMD CPU yet.
2132 * Some AMD box with quadcore cpu and 8 sockets apicid
2133 * will be [4, 0x23] or [8, 0x27] could be thought to
2134 * vsmp box still need checking...
2136 if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && !is_vsmp_box())
2139 bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid);
2140 bitmap_zero(clustermap, NUM_APIC_CLUSTERS);
2142 for (i = 0; i < nr_cpu_ids; i++) {
2143 /* are we being called early in kernel startup? */
2144 if (bios_cpu_apicid) {
2145 id = bios_cpu_apicid[i];
2146 } else if (i < nr_cpu_ids) {
2148 id = per_cpu(x86_bios_cpu_apicid, i);
2154 if (id != BAD_APICID)
2155 __set_bit(APIC_CLUSTERID(id), clustermap);
2158 /* Problem: Partially populated chassis may not have CPUs in some of
2159 * the APIC clusters they have been allocated. Only present CPUs have
2160 * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap.
2161 * Since clusters are allocated sequentially, count zeros only if
2162 * they are bounded by ones.
2166 for (i = 0; i < NUM_APIC_CLUSTERS; i++) {
2167 if (test_bit(i, clustermap)) {
2168 clusters += 1 + zeros;
2174 /* ScaleMP vSMPowered boxes have one cluster per board and TSCs are
2175 * not guaranteed to be synced between boards
2177 if (is_vsmp_box() && clusters > 1)
2181 * If clusters > 2, then should be multi-chassis.
2182 * May have to revisit this when multi-core + hyperthreaded CPUs come
2183 * out, but AFAIK this will work even for them.
2185 return (clusters > 2);
2190 * APIC command line parameters
2192 static int __init setup_disableapic(char *arg)
2195 setup_clear_cpu_cap(X86_FEATURE_APIC);
2198 early_param("disableapic", setup_disableapic);
2200 /* same as disableapic, for compatibility */
2201 static int __init setup_nolapic(char *arg)
2203 return setup_disableapic(arg);
2205 early_param("nolapic", setup_nolapic);
2207 static int __init parse_lapic_timer_c2_ok(char *arg)
2209 local_apic_timer_c2_ok = 1;
2212 early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
2214 static int __init parse_disable_apic_timer(char *arg)
2216 disable_apic_timer = 1;
2219 early_param("noapictimer", parse_disable_apic_timer);
2221 static int __init parse_nolapic_timer(char *arg)
2223 disable_apic_timer = 1;
2226 early_param("nolapic_timer", parse_nolapic_timer);
2228 static int __init apic_set_verbosity(char *arg)
2231 #ifdef CONFIG_X86_64
2232 skip_ioapic_setup = 0;
2238 if (strcmp("debug", arg) == 0)
2239 apic_verbosity = APIC_DEBUG;
2240 else if (strcmp("verbose", arg) == 0)
2241 apic_verbosity = APIC_VERBOSE;
2243 pr_warning("APIC Verbosity level %s not recognised"
2244 " use apic=verbose or apic=debug\n", arg);
2250 early_param("apic", apic_set_verbosity);
2252 static int __init lapic_insert_resource(void)
2257 /* Put local APIC into the resource map. */
2258 lapic_resource.start = apic_phys;
2259 lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1;
2260 insert_resource(&iomem_resource, &lapic_resource);
2266 * need call insert after e820_reserve_resources()
2267 * that is using request_resource
2269 late_initcall(lapic_insert_resource);