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/perf_event.h>
18 #include <linux/kernel_stat.h>
19 #include <linux/mc146818rtc.h>
20 #include <linux/acpi_pmtmr.h>
21 #include <linux/clockchips.h>
22 #include <linux/interrupt.h>
23 #include <linux/bootmem.h>
24 #include <linux/ftrace.h>
25 #include <linux/ioport.h>
26 #include <linux/module.h>
27 #include <linux/sysdev.h>
28 #include <linux/delay.h>
29 #include <linux/timex.h>
30 #include <linux/dmar.h>
31 #include <linux/init.h>
32 #include <linux/cpu.h>
33 #include <linux/dmi.h>
34 #include <linux/nmi.h>
35 #include <linux/smp.h>
38 #include <asm/perf_event.h>
39 #include <asm/x86_init.h>
40 #include <asm/pgalloc.h>
41 #include <asm/atomic.h>
42 #include <asm/mpspec.h>
43 #include <asm/i8253.h>
44 #include <asm/i8259.h>
45 #include <asm/proto.h>
53 #include <asm/kvm_para.h>
56 unsigned int num_processors;
58 unsigned disabled_cpus __cpuinitdata;
60 /* Processor that is doing the boot up */
61 unsigned int boot_cpu_physical_apicid = -1U;
64 * The highest APIC ID seen during enumeration.
66 unsigned int max_physical_apicid;
69 * Bitmask of physically existing CPUs:
71 physid_mask_t phys_cpu_present_map;
74 * Map cpu index to physical APIC ID
76 DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
77 DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
78 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
79 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
83 * Knob to control our willingness to enable the local APIC.
87 static int force_enable_local_apic;
89 * APIC command line parameters
91 static int __init parse_lapic(char *arg)
93 force_enable_local_apic = 1;
96 early_param("lapic", parse_lapic);
97 /* Local APIC was disabled by the BIOS and enabled by the kernel */
98 static int enabled_via_apicbase;
101 * Handle interrupt mode configuration register (IMCR).
102 * This register controls whether the interrupt signals
103 * that reach the BSP come from the master PIC or from the
104 * local APIC. Before entering Symmetric I/O Mode, either
105 * the BIOS or the operating system must switch out of
106 * PIC Mode by changing the IMCR.
108 static inline void imcr_pic_to_apic(void)
110 /* select IMCR register */
112 /* NMI and 8259 INTR go through APIC */
116 static inline void imcr_apic_to_pic(void)
118 /* select IMCR register */
120 /* NMI and 8259 INTR go directly to BSP */
126 static int apic_calibrate_pmtmr __initdata;
127 static __init int setup_apicpmtimer(char *s)
129 apic_calibrate_pmtmr = 1;
133 __setup("apicpmtimer", setup_apicpmtimer);
137 #ifdef CONFIG_X86_X2APIC
138 /* x2apic enabled before OS handover */
139 static int x2apic_preenabled;
140 static __init int setup_nox2apic(char *str)
142 if (x2apic_enabled()) {
143 pr_warning("Bios already enabled x2apic, "
144 "can't enforce nox2apic");
148 setup_clear_cpu_cap(X86_FEATURE_X2APIC);
151 early_param("nox2apic", setup_nox2apic);
154 unsigned long mp_lapic_addr;
156 /* Disable local APIC timer from the kernel commandline or via dmi quirk */
157 static int disable_apic_timer __cpuinitdata;
158 /* Local APIC timer works in C2 */
159 int local_apic_timer_c2_ok;
160 EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
162 int first_system_vector = 0xfe;
165 * Debug level, exported for io_apic.c
167 unsigned int apic_verbosity;
171 /* Have we found an MP table */
172 int smp_found_config;
174 static struct resource lapic_resource = {
175 .name = "Local APIC",
176 .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
179 static unsigned int calibration_result;
181 static int lapic_next_event(unsigned long delta,
182 struct clock_event_device *evt);
183 static void lapic_timer_setup(enum clock_event_mode mode,
184 struct clock_event_device *evt);
185 static void lapic_timer_broadcast(const struct cpumask *mask);
186 static void apic_pm_activate(void);
189 * The local apic timer can be used for any function which is CPU local.
191 static struct clock_event_device lapic_clockevent = {
193 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT
194 | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY,
196 .set_mode = lapic_timer_setup,
197 .set_next_event = lapic_next_event,
198 .broadcast = lapic_timer_broadcast,
202 static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
204 static unsigned long apic_phys;
207 * Get the LAPIC version
209 static inline int lapic_get_version(void)
211 return GET_APIC_VERSION(apic_read(APIC_LVR));
215 * Check, if the APIC is integrated or a separate chip
217 static inline int lapic_is_integrated(void)
222 return APIC_INTEGRATED(lapic_get_version());
227 * Check, whether this is a modern or a first generation APIC
229 static int modern_apic(void)
231 /* AMD systems use old APIC versions, so check the CPU */
232 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
233 boot_cpu_data.x86 >= 0xf)
235 return lapic_get_version() >= 0x14;
239 * right after this call apic become NOOP driven
240 * so apic->write/read doesn't do anything
242 void apic_disable(void)
244 pr_info("APIC: switched to apic NOOP\n");
248 void native_apic_wait_icr_idle(void)
250 while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
254 u32 native_safe_apic_wait_icr_idle(void)
261 send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
265 } while (timeout++ < 1000);
270 void native_apic_icr_write(u32 low, u32 id)
272 apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id));
273 apic_write(APIC_ICR, low);
276 u64 native_apic_icr_read(void)
280 icr2 = apic_read(APIC_ICR2);
281 icr1 = apic_read(APIC_ICR);
283 return icr1 | ((u64)icr2 << 32);
287 * enable_NMI_through_LVT0 - enable NMI through local vector table 0
289 void __cpuinit enable_NMI_through_LVT0(void)
293 /* unmask and set to NMI */
296 /* Level triggered for 82489DX (32bit mode) */
297 if (!lapic_is_integrated())
298 v |= APIC_LVT_LEVEL_TRIGGER;
300 apic_write(APIC_LVT0, v);
305 * get_physical_broadcast - Get number of physical broadcast IDs
307 int get_physical_broadcast(void)
309 return modern_apic() ? 0xff : 0xf;
314 * lapic_get_maxlvt - get the maximum number of local vector table entries
316 int lapic_get_maxlvt(void)
320 v = apic_read(APIC_LVR);
322 * - we always have APIC integrated on 64bit mode
323 * - 82489DXs do not report # of LVT entries
325 return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2;
333 #define APIC_DIVISOR 16
336 * This function sets up the local APIC timer, with a timeout of
337 * 'clocks' APIC bus clock. During calibration we actually call
338 * this function twice on the boot CPU, once with a bogus timeout
339 * value, second time for real. The other (noncalibrating) CPUs
340 * call this function only once, with the real, calibrated value.
342 * We do reads before writes even if unnecessary, to get around the
343 * P5 APIC double write bug.
345 static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
347 unsigned int lvtt_value, tmp_value;
349 lvtt_value = LOCAL_TIMER_VECTOR;
351 lvtt_value |= APIC_LVT_TIMER_PERIODIC;
352 if (!lapic_is_integrated())
353 lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV);
356 lvtt_value |= APIC_LVT_MASKED;
358 apic_write(APIC_LVTT, lvtt_value);
363 tmp_value = apic_read(APIC_TDCR);
364 apic_write(APIC_TDCR,
365 (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) |
369 apic_write(APIC_TMICT, clocks / APIC_DIVISOR);
373 * Setup extended LVT, AMD specific (K8, family 10h)
375 * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and
376 * MCE interrupts are supported. Thus MCE offset must be set to 0.
378 * If mask=1, the LVT entry does not generate interrupts while mask=0
379 * enables the vector. See also the BKDGs.
382 #define APIC_EILVT_LVTOFF_MCE 0
383 #define APIC_EILVT_LVTOFF_IBS 1
385 static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask)
387 unsigned long reg = (lvt_off << 4) + APIC_EILVTn(0);
388 unsigned int v = (mask << 16) | (msg_type << 8) | vector;
393 u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask)
395 setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask);
396 return APIC_EILVT_LVTOFF_MCE;
399 u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask)
401 setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask);
402 return APIC_EILVT_LVTOFF_IBS;
404 EXPORT_SYMBOL_GPL(setup_APIC_eilvt_ibs);
407 * Program the next event, relative to now
409 static int lapic_next_event(unsigned long delta,
410 struct clock_event_device *evt)
412 apic_write(APIC_TMICT, delta);
417 * Setup the lapic timer in periodic or oneshot mode
419 static void lapic_timer_setup(enum clock_event_mode mode,
420 struct clock_event_device *evt)
425 /* Lapic used as dummy for broadcast ? */
426 if (evt->features & CLOCK_EVT_FEAT_DUMMY)
429 local_irq_save(flags);
432 case CLOCK_EVT_MODE_PERIODIC:
433 case CLOCK_EVT_MODE_ONESHOT:
434 __setup_APIC_LVTT(calibration_result,
435 mode != CLOCK_EVT_MODE_PERIODIC, 1);
437 case CLOCK_EVT_MODE_UNUSED:
438 case CLOCK_EVT_MODE_SHUTDOWN:
439 v = apic_read(APIC_LVTT);
440 v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
441 apic_write(APIC_LVTT, v);
442 apic_write(APIC_TMICT, 0);
444 case CLOCK_EVT_MODE_RESUME:
445 /* Nothing to do here */
449 local_irq_restore(flags);
453 * Local APIC timer broadcast function
455 static void lapic_timer_broadcast(const struct cpumask *mask)
458 apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
463 * Setup the local APIC timer for this CPU. Copy the initilized values
464 * of the boot CPU and register the clock event in the framework.
466 static void __cpuinit setup_APIC_timer(void)
468 struct clock_event_device *levt = &__get_cpu_var(lapic_events);
470 if (cpu_has(¤t_cpu_data, X86_FEATURE_ARAT)) {
471 lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP;
472 /* Make LAPIC timer preferrable over percpu HPET */
473 lapic_clockevent.rating = 150;
476 memcpy(levt, &lapic_clockevent, sizeof(*levt));
477 levt->cpumask = cpumask_of(smp_processor_id());
479 clockevents_register_device(levt);
483 * In this functions we calibrate APIC bus clocks to the external timer.
485 * We want to do the calibration only once since we want to have local timer
486 * irqs syncron. CPUs connected by the same APIC bus have the very same bus
489 * This was previously done by reading the PIT/HPET and waiting for a wrap
490 * around to find out, that a tick has elapsed. I have a box, where the PIT
491 * readout is broken, so it never gets out of the wait loop again. This was
492 * also reported by others.
494 * Monitoring the jiffies value is inaccurate and the clockevents
495 * infrastructure allows us to do a simple substitution of the interrupt
498 * The calibration routine also uses the pm_timer when possible, as the PIT
499 * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes
500 * back to normal later in the boot process).
503 #define LAPIC_CAL_LOOPS (HZ/10)
505 static __initdata int lapic_cal_loops = -1;
506 static __initdata long lapic_cal_t1, lapic_cal_t2;
507 static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2;
508 static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2;
509 static __initdata unsigned long lapic_cal_j1, lapic_cal_j2;
512 * Temporary interrupt handler.
514 static void __init lapic_cal_handler(struct clock_event_device *dev)
516 unsigned long long tsc = 0;
517 long tapic = apic_read(APIC_TMCCT);
518 unsigned long pm = acpi_pm_read_early();
523 switch (lapic_cal_loops++) {
525 lapic_cal_t1 = tapic;
526 lapic_cal_tsc1 = tsc;
528 lapic_cal_j1 = jiffies;
531 case LAPIC_CAL_LOOPS:
532 lapic_cal_t2 = tapic;
533 lapic_cal_tsc2 = tsc;
534 if (pm < lapic_cal_pm1)
535 pm += ACPI_PM_OVRRUN;
537 lapic_cal_j2 = jiffies;
543 calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc)
545 const long pm_100ms = PMTMR_TICKS_PER_SEC / 10;
546 const long pm_thresh = pm_100ms / 100;
550 #ifndef CONFIG_X86_PM_TIMER
554 apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm);
556 /* Check, if the PM timer is available */
560 mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22);
562 if (deltapm > (pm_100ms - pm_thresh) &&
563 deltapm < (pm_100ms + pm_thresh)) {
564 apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n");
568 res = (((u64)deltapm) * mult) >> 22;
569 do_div(res, 1000000);
570 pr_warning("APIC calibration not consistent "
571 "with PM-Timer: %ldms instead of 100ms\n",(long)res);
573 /* Correct the lapic counter value */
574 res = (((u64)(*delta)) * pm_100ms);
575 do_div(res, deltapm);
576 pr_info("APIC delta adjusted to PM-Timer: "
577 "%lu (%ld)\n", (unsigned long)res, *delta);
580 /* Correct the tsc counter value */
582 res = (((u64)(*deltatsc)) * pm_100ms);
583 do_div(res, deltapm);
584 apic_printk(APIC_VERBOSE, "TSC delta adjusted to "
585 "PM-Timer: %lu (%ld)\n",
586 (unsigned long)res, *deltatsc);
587 *deltatsc = (long)res;
593 static int __init calibrate_APIC_clock(void)
595 struct clock_event_device *levt = &__get_cpu_var(lapic_events);
596 void (*real_handler)(struct clock_event_device *dev);
597 unsigned long deltaj;
598 long delta, deltatsc;
599 int pm_referenced = 0;
603 /* Replace the global interrupt handler */
604 real_handler = global_clock_event->event_handler;
605 global_clock_event->event_handler = lapic_cal_handler;
608 * Setup the APIC counter to maximum. There is no way the lapic
609 * can underflow in the 100ms detection time frame
611 __setup_APIC_LVTT(0xffffffff, 0, 0);
613 /* Let the interrupts run */
616 while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
621 /* Restore the real event handler */
622 global_clock_event->event_handler = real_handler;
624 /* Build delta t1-t2 as apic timer counts down */
625 delta = lapic_cal_t1 - lapic_cal_t2;
626 apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta);
628 deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1);
630 /* we trust the PM based calibration if possible */
631 pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1,
634 /* Calculate the scaled math multiplication factor */
635 lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
636 lapic_clockevent.shift);
637 lapic_clockevent.max_delta_ns =
638 clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
639 lapic_clockevent.min_delta_ns =
640 clockevent_delta2ns(0xF, &lapic_clockevent);
642 calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
644 apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
645 apic_printk(APIC_VERBOSE, "..... mult: %u\n", lapic_clockevent.mult);
646 apic_printk(APIC_VERBOSE, "..... calibration result: %u\n",
650 apic_printk(APIC_VERBOSE, "..... CPU clock speed is "
652 (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ),
653 (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ));
656 apic_printk(APIC_VERBOSE, "..... host bus clock speed is "
658 calibration_result / (1000000 / HZ),
659 calibration_result % (1000000 / HZ));
662 * Do a sanity check on the APIC calibration result
664 if (calibration_result < (1000000 / HZ)) {
666 pr_warning("APIC frequency too slow, disabling apic timer\n");
670 levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
673 * PM timer calibration failed or not turned on
674 * so lets try APIC timer based calibration
676 if (!pm_referenced) {
677 apic_printk(APIC_VERBOSE, "... verify APIC timer\n");
680 * Setup the apic timer manually
682 levt->event_handler = lapic_cal_handler;
683 lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt);
684 lapic_cal_loops = -1;
686 /* Let the interrupts run */
689 while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
692 /* Stop the lapic timer */
693 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt);
696 deltaj = lapic_cal_j2 - lapic_cal_j1;
697 apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj);
699 /* Check, if the jiffies result is consistent */
700 if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2)
701 apic_printk(APIC_VERBOSE, "... jiffies result ok\n");
703 levt->features |= CLOCK_EVT_FEAT_DUMMY;
707 if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
708 pr_warning("APIC timer disabled due to verification failure\n");
716 * Setup the boot APIC
718 * Calibrate and verify the result.
720 void __init setup_boot_APIC_clock(void)
723 * The local apic timer can be disabled via the kernel
724 * commandline or from the CPU detection code. Register the lapic
725 * timer as a dummy clock event source on SMP systems, so the
726 * broadcast mechanism is used. On UP systems simply ignore it.
728 if (disable_apic_timer) {
729 pr_info("Disabling APIC timer\n");
730 /* No broadcast on UP ! */
731 if (num_possible_cpus() > 1) {
732 lapic_clockevent.mult = 1;
738 apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n"
739 "calibrating APIC timer ...\n");
741 if (calibrate_APIC_clock()) {
742 /* No broadcast on UP ! */
743 if (num_possible_cpus() > 1)
749 * If nmi_watchdog is set to IO_APIC, we need the
750 * PIT/HPET going. Otherwise register lapic as a dummy
753 if (nmi_watchdog != NMI_IO_APIC)
754 lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
756 pr_warning("APIC timer registered as dummy,"
757 " due to nmi_watchdog=%d!\n", nmi_watchdog);
759 /* Setup the lapic or request the broadcast */
763 void __cpuinit setup_secondary_APIC_clock(void)
769 * The guts of the apic timer interrupt
771 static void local_apic_timer_interrupt(void)
773 int cpu = smp_processor_id();
774 struct clock_event_device *evt = &per_cpu(lapic_events, cpu);
777 * Normally we should not be here till LAPIC has been initialized but
778 * in some cases like kdump, its possible that there is a pending LAPIC
779 * timer interrupt from previous kernel's context and is delivered in
780 * new kernel the moment interrupts are enabled.
782 * Interrupts are enabled early and LAPIC is setup much later, hence
783 * its possible that when we get here evt->event_handler is NULL.
784 * Check for event_handler being NULL and discard the interrupt as
787 if (!evt->event_handler) {
788 pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu);
790 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt);
795 * the NMI deadlock-detector uses this.
797 inc_irq_stat(apic_timer_irqs);
799 evt->event_handler(evt);
803 * Local APIC timer interrupt. This is the most natural way for doing
804 * local interrupts, but local timer interrupts can be emulated by
805 * broadcast interrupts too. [in case the hw doesn't support APIC timers]
807 * [ if a single-CPU system runs an SMP kernel then we call the local
808 * interrupt as well. Thus we cannot inline the local irq ... ]
810 void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs)
812 struct pt_regs *old_regs = set_irq_regs(regs);
815 * NOTE! We'd better ACK the irq immediately,
816 * because timer handling can be slow.
820 * update_process_times() expects us to have done irq_enter().
821 * Besides, if we don't timer interrupts ignore the global
822 * interrupt lock, which is the WrongThing (tm) to do.
826 local_apic_timer_interrupt();
829 set_irq_regs(old_regs);
832 int setup_profiling_timer(unsigned int multiplier)
838 * Local APIC start and shutdown
842 * clear_local_APIC - shutdown the local APIC
844 * This is called, when a CPU is disabled and before rebooting, so the state of
845 * the local APIC has no dangling leftovers. Also used to cleanout any BIOS
846 * leftovers during boot.
848 void clear_local_APIC(void)
853 /* APIC hasn't been mapped yet */
854 if (!x2apic_mode && !apic_phys)
857 maxlvt = lapic_get_maxlvt();
859 * Masking an LVT entry can trigger a local APIC error
860 * if the vector is zero. Mask LVTERR first to prevent this.
863 v = ERROR_APIC_VECTOR; /* any non-zero vector will do */
864 apic_write(APIC_LVTERR, v | APIC_LVT_MASKED);
867 * Careful: we have to set masks only first to deassert
868 * any level-triggered sources.
870 v = apic_read(APIC_LVTT);
871 apic_write(APIC_LVTT, v | APIC_LVT_MASKED);
872 v = apic_read(APIC_LVT0);
873 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
874 v = apic_read(APIC_LVT1);
875 apic_write(APIC_LVT1, v | APIC_LVT_MASKED);
877 v = apic_read(APIC_LVTPC);
878 apic_write(APIC_LVTPC, v | APIC_LVT_MASKED);
881 /* lets not touch this if we didn't frob it */
882 #ifdef CONFIG_X86_THERMAL_VECTOR
884 v = apic_read(APIC_LVTTHMR);
885 apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED);
888 #ifdef CONFIG_X86_MCE_INTEL
890 v = apic_read(APIC_LVTCMCI);
891 if (!(v & APIC_LVT_MASKED))
892 apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED);
897 * Clean APIC state for other OSs:
899 apic_write(APIC_LVTT, APIC_LVT_MASKED);
900 apic_write(APIC_LVT0, APIC_LVT_MASKED);
901 apic_write(APIC_LVT1, APIC_LVT_MASKED);
903 apic_write(APIC_LVTERR, APIC_LVT_MASKED);
905 apic_write(APIC_LVTPC, APIC_LVT_MASKED);
907 /* Integrated APIC (!82489DX) ? */
908 if (lapic_is_integrated()) {
910 /* Clear ESR due to Pentium errata 3AP and 11AP */
911 apic_write(APIC_ESR, 0);
917 * disable_local_APIC - clear and disable the local APIC
919 void disable_local_APIC(void)
923 /* APIC hasn't been mapped yet */
924 if (!x2apic_mode && !apic_phys)
930 * Disable APIC (implies clearing of registers
933 value = apic_read(APIC_SPIV);
934 value &= ~APIC_SPIV_APIC_ENABLED;
935 apic_write(APIC_SPIV, value);
939 * When LAPIC was disabled by the BIOS and enabled by the kernel,
940 * restore the disabled state.
942 if (enabled_via_apicbase) {
945 rdmsr(MSR_IA32_APICBASE, l, h);
946 l &= ~MSR_IA32_APICBASE_ENABLE;
947 wrmsr(MSR_IA32_APICBASE, l, h);
953 * If Linux enabled the LAPIC against the BIOS default disable it down before
954 * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and
955 * not power-off. Additionally clear all LVT entries before disable_local_APIC
956 * for the case where Linux didn't enable the LAPIC.
958 void lapic_shutdown(void)
962 if (!cpu_has_apic && !apic_from_smp_config())
965 local_irq_save(flags);
968 if (!enabled_via_apicbase)
972 disable_local_APIC();
975 local_irq_restore(flags);
979 * This is to verify that we're looking at a real local APIC.
980 * Check these against your board if the CPUs aren't getting
981 * started for no apparent reason.
983 int __init verify_local_APIC(void)
985 unsigned int reg0, reg1;
988 * The version register is read-only in a real APIC.
990 reg0 = apic_read(APIC_LVR);
991 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0);
992 apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK);
993 reg1 = apic_read(APIC_LVR);
994 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1);
997 * The two version reads above should print the same
998 * numbers. If the second one is different, then we
999 * poke at a non-APIC.
1005 * Check if the version looks reasonably.
1007 reg1 = GET_APIC_VERSION(reg0);
1008 if (reg1 == 0x00 || reg1 == 0xff)
1010 reg1 = lapic_get_maxlvt();
1011 if (reg1 < 0x02 || reg1 == 0xff)
1015 * The ID register is read/write in a real APIC.
1017 reg0 = apic_read(APIC_ID);
1018 apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
1019 apic_write(APIC_ID, reg0 ^ apic->apic_id_mask);
1020 reg1 = apic_read(APIC_ID);
1021 apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1);
1022 apic_write(APIC_ID, reg0);
1023 if (reg1 != (reg0 ^ apic->apic_id_mask))
1027 * The next two are just to see if we have sane values.
1028 * They're only really relevant if we're in Virtual Wire
1029 * compatibility mode, but most boxes are anymore.
1031 reg0 = apic_read(APIC_LVT0);
1032 apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0);
1033 reg1 = apic_read(APIC_LVT1);
1034 apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1);
1040 * sync_Arb_IDs - synchronize APIC bus arbitration IDs
1042 void __init sync_Arb_IDs(void)
1045 * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
1048 if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
1054 apic_wait_icr_idle();
1056 apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n");
1057 apic_write(APIC_ICR, APIC_DEST_ALLINC |
1058 APIC_INT_LEVELTRIG | APIC_DM_INIT);
1062 * An initial setup of the virtual wire mode.
1064 void __init init_bsp_APIC(void)
1069 * Don't do the setup now if we have a SMP BIOS as the
1070 * through-I/O-APIC virtual wire mode might be active.
1072 if (smp_found_config || !cpu_has_apic)
1076 * Do not trust the local APIC being empty at bootup.
1083 value = apic_read(APIC_SPIV);
1084 value &= ~APIC_VECTOR_MASK;
1085 value |= APIC_SPIV_APIC_ENABLED;
1087 #ifdef CONFIG_X86_32
1088 /* This bit is reserved on P4/Xeon and should be cleared */
1089 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
1090 (boot_cpu_data.x86 == 15))
1091 value &= ~APIC_SPIV_FOCUS_DISABLED;
1094 value |= APIC_SPIV_FOCUS_DISABLED;
1095 value |= SPURIOUS_APIC_VECTOR;
1096 apic_write(APIC_SPIV, value);
1099 * Set up the virtual wire mode.
1101 apic_write(APIC_LVT0, APIC_DM_EXTINT);
1102 value = APIC_DM_NMI;
1103 if (!lapic_is_integrated()) /* 82489DX */
1104 value |= APIC_LVT_LEVEL_TRIGGER;
1105 apic_write(APIC_LVT1, value);
1108 static void __cpuinit lapic_setup_esr(void)
1110 unsigned int oldvalue, value, maxlvt;
1112 if (!lapic_is_integrated()) {
1113 pr_info("No ESR for 82489DX.\n");
1117 if (apic->disable_esr) {
1119 * Something untraceable is creating bad interrupts on
1120 * secondary quads ... for the moment, just leave the
1121 * ESR disabled - we can't do anything useful with the
1122 * errors anyway - mbligh
1124 pr_info("Leaving ESR disabled.\n");
1128 maxlvt = lapic_get_maxlvt();
1129 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
1130 apic_write(APIC_ESR, 0);
1131 oldvalue = apic_read(APIC_ESR);
1133 /* enables sending errors */
1134 value = ERROR_APIC_VECTOR;
1135 apic_write(APIC_LVTERR, value);
1138 * spec says clear errors after enabling vector.
1141 apic_write(APIC_ESR, 0);
1142 value = apic_read(APIC_ESR);
1143 if (value != oldvalue)
1144 apic_printk(APIC_VERBOSE, "ESR value before enabling "
1145 "vector: 0x%08x after: 0x%08x\n",
1151 * setup_local_APIC - setup the local APIC
1153 void __cpuinit setup_local_APIC(void)
1155 unsigned int value, queued;
1156 int i, j, acked = 0;
1157 unsigned long long tsc = 0, ntsc;
1158 long long max_loops = cpu_khz;
1164 arch_disable_smp_support();
1168 #ifdef CONFIG_X86_32
1169 /* Pound the ESR really hard over the head with a big hammer - mbligh */
1170 if (lapic_is_integrated() && apic->disable_esr) {
1171 apic_write(APIC_ESR, 0);
1172 apic_write(APIC_ESR, 0);
1173 apic_write(APIC_ESR, 0);
1174 apic_write(APIC_ESR, 0);
1177 perf_events_lapic_init();
1182 * Double-check whether this APIC is really registered.
1183 * This is meaningless in clustered apic mode, so we skip it.
1185 BUG_ON(!apic->apic_id_registered());
1188 * Intel recommends to set DFR, LDR and TPR before enabling
1189 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
1190 * document number 292116). So here it goes...
1192 apic->init_apic_ldr();
1195 * Set Task Priority to 'accept all'. We never change this
1198 value = apic_read(APIC_TASKPRI);
1199 value &= ~APIC_TPRI_MASK;
1200 apic_write(APIC_TASKPRI, value);
1203 * After a crash, we no longer service the interrupts and a pending
1204 * interrupt from previous kernel might still have ISR bit set.
1206 * Most probably by now CPU has serviced that pending interrupt and
1207 * it might not have done the ack_APIC_irq() because it thought,
1208 * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it
1209 * does not clear the ISR bit and cpu thinks it has already serivced
1210 * the interrupt. Hence a vector might get locked. It was noticed
1211 * for timer irq (vector 0x31). Issue an extra EOI to clear ISR.
1215 for (i = APIC_ISR_NR - 1; i >= 0; i--)
1216 queued |= apic_read(APIC_IRR + i*0x10);
1218 for (i = APIC_ISR_NR - 1; i >= 0; i--) {
1219 value = apic_read(APIC_ISR + i*0x10);
1220 for (j = 31; j >= 0; j--) {
1221 if (value & (1<<j)) {
1228 printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n",
1234 max_loops = (cpu_khz << 10) - (ntsc - tsc);
1237 } while (queued && max_loops > 0);
1238 WARN_ON(max_loops <= 0);
1241 * Now that we are all set up, enable the APIC
1243 value = apic_read(APIC_SPIV);
1244 value &= ~APIC_VECTOR_MASK;
1248 value |= APIC_SPIV_APIC_ENABLED;
1250 #ifdef CONFIG_X86_32
1252 * Some unknown Intel IO/APIC (or APIC) errata is biting us with
1253 * certain networking cards. If high frequency interrupts are
1254 * happening on a particular IOAPIC pin, plus the IOAPIC routing
1255 * entry is masked/unmasked at a high rate as well then sooner or
1256 * later IOAPIC line gets 'stuck', no more interrupts are received
1257 * from the device. If focus CPU is disabled then the hang goes
1260 * [ This bug can be reproduced easily with a level-triggered
1261 * PCI Ne2000 networking cards and PII/PIII processors, dual
1265 * Actually disabling the focus CPU check just makes the hang less
1266 * frequent as it makes the interrupt distributon model be more
1267 * like LRU than MRU (the short-term load is more even across CPUs).
1268 * See also the comment in end_level_ioapic_irq(). --macro
1272 * - enable focus processor (bit==0)
1273 * - 64bit mode always use processor focus
1274 * so no need to set it
1276 value &= ~APIC_SPIV_FOCUS_DISABLED;
1280 * Set spurious IRQ vector
1282 value |= SPURIOUS_APIC_VECTOR;
1283 apic_write(APIC_SPIV, value);
1286 * Set up LVT0, LVT1:
1288 * set up through-local-APIC on the BP's LINT0. This is not
1289 * strictly necessary in pure symmetric-IO mode, but sometimes
1290 * we delegate interrupts to the 8259A.
1293 * TODO: set up through-local-APIC from through-I/O-APIC? --macro
1295 value = apic_read(APIC_LVT0) & APIC_LVT_MASKED;
1296 if (!smp_processor_id() && (pic_mode || !value)) {
1297 value = APIC_DM_EXTINT;
1298 apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n",
1299 smp_processor_id());
1301 value = APIC_DM_EXTINT | APIC_LVT_MASKED;
1302 apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n",
1303 smp_processor_id());
1305 apic_write(APIC_LVT0, value);
1308 * only the BP should see the LINT1 NMI signal, obviously.
1310 if (!smp_processor_id())
1311 value = APIC_DM_NMI;
1313 value = APIC_DM_NMI | APIC_LVT_MASKED;
1314 if (!lapic_is_integrated()) /* 82489DX */
1315 value |= APIC_LVT_LEVEL_TRIGGER;
1316 apic_write(APIC_LVT1, value);
1320 #ifdef CONFIG_X86_MCE_INTEL
1321 /* Recheck CMCI information after local APIC is up on CPU #0 */
1322 if (smp_processor_id() == 0)
1327 void __cpuinit end_local_APIC_setup(void)
1331 #ifdef CONFIG_X86_32
1334 /* Disable the local apic timer */
1335 value = apic_read(APIC_LVTT);
1336 value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
1337 apic_write(APIC_LVTT, value);
1341 setup_apic_nmi_watchdog(NULL);
1345 #ifdef CONFIG_X86_X2APIC
1346 void check_x2apic(void)
1348 if (x2apic_enabled()) {
1349 pr_info("x2apic enabled by BIOS, switching to x2apic ops\n");
1350 x2apic_preenabled = x2apic_mode = 1;
1354 void enable_x2apic(void)
1361 rdmsr(MSR_IA32_APICBASE, msr, msr2);
1362 if (!(msr & X2APIC_ENABLE)) {
1363 printk_once(KERN_INFO "Enabling x2apic\n");
1364 wrmsr(MSR_IA32_APICBASE, msr | X2APIC_ENABLE, 0);
1367 #endif /* CONFIG_X86_X2APIC */
1369 int __init enable_IR(void)
1371 #ifdef CONFIG_INTR_REMAP
1372 if (!intr_remapping_supported()) {
1373 pr_debug("intr-remapping not supported\n");
1377 if (!x2apic_preenabled && skip_ioapic_setup) {
1378 pr_info("Skipped enabling intr-remap because of skipping "
1383 if (enable_intr_remapping(x2apic_supported()))
1386 pr_info("Enabled Interrupt-remapping\n");
1394 void __init enable_IR_x2apic(void)
1396 unsigned long flags;
1397 struct IO_APIC_route_entry **ioapic_entries = NULL;
1398 int ret, x2apic_enabled = 0;
1399 int dmar_table_init_ret;
1401 dmar_table_init_ret = dmar_table_init();
1402 if (dmar_table_init_ret && !x2apic_supported())
1405 ioapic_entries = alloc_ioapic_entries();
1406 if (!ioapic_entries) {
1407 pr_err("Allocate ioapic_entries failed\n");
1411 ret = save_IO_APIC_setup(ioapic_entries);
1413 pr_info("Saving IO-APIC state failed: %d\n", ret);
1417 local_irq_save(flags);
1418 legacy_pic->mask_all();
1419 mask_IO_APIC_setup(ioapic_entries);
1421 if (dmar_table_init_ret)
1427 /* IR is required if there is APIC ID > 255 even when running
1430 if (max_physical_apicid > 255 || !kvm_para_available())
1433 * without IR all CPUs can be addressed by IOAPIC/MSI
1434 * only in physical mode
1436 x2apic_force_phys();
1441 if (x2apic_supported() && !x2apic_mode) {
1444 pr_info("Enabled x2apic\n");
1448 if (!ret) /* IR enabling failed */
1449 restore_IO_APIC_setup(ioapic_entries);
1450 legacy_pic->restore_mask();
1451 local_irq_restore(flags);
1455 free_ioapic_entries(ioapic_entries);
1460 if (x2apic_preenabled)
1461 panic("x2apic: enabled by BIOS but kernel init failed.");
1462 else if (cpu_has_x2apic)
1463 pr_info("Not enabling x2apic, Intr-remapping init failed.\n");
1466 #ifdef CONFIG_X86_64
1468 * Detect and enable local APICs on non-SMP boards.
1469 * Original code written by Keir Fraser.
1470 * On AMD64 we trust the BIOS - if it says no APIC it is likely
1471 * not correctly set up (usually the APIC timer won't work etc.)
1473 static int __init detect_init_APIC(void)
1475 if (!cpu_has_apic) {
1476 pr_info("No local APIC present\n");
1480 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
1485 * Detect and initialize APIC
1487 static int __init detect_init_APIC(void)
1491 /* Disabled by kernel option? */
1495 switch (boot_cpu_data.x86_vendor) {
1496 case X86_VENDOR_AMD:
1497 if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) ||
1498 (boot_cpu_data.x86 >= 15))
1501 case X86_VENDOR_INTEL:
1502 if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 ||
1503 (boot_cpu_data.x86 == 5 && cpu_has_apic))
1510 if (!cpu_has_apic) {
1512 * Over-ride BIOS and try to enable the local APIC only if
1513 * "lapic" specified.
1515 if (!force_enable_local_apic) {
1516 pr_info("Local APIC disabled by BIOS -- "
1517 "you can enable it with \"lapic\"\n");
1521 * Some BIOSes disable the local APIC in the APIC_BASE
1522 * MSR. This can only be done in software for Intel P6 or later
1523 * and AMD K7 (Model > 1) or later.
1525 rdmsr(MSR_IA32_APICBASE, l, h);
1526 if (!(l & MSR_IA32_APICBASE_ENABLE)) {
1527 pr_info("Local APIC disabled by BIOS -- reenabling.\n");
1528 l &= ~MSR_IA32_APICBASE_BASE;
1529 l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE;
1530 wrmsr(MSR_IA32_APICBASE, l, h);
1531 enabled_via_apicbase = 1;
1535 * The APIC feature bit should now be enabled
1538 features = cpuid_edx(1);
1539 if (!(features & (1 << X86_FEATURE_APIC))) {
1540 pr_warning("Could not enable APIC!\n");
1543 set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
1544 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
1546 /* The BIOS may have set up the APIC at some other address */
1547 rdmsr(MSR_IA32_APICBASE, l, h);
1548 if (l & MSR_IA32_APICBASE_ENABLE)
1549 mp_lapic_addr = l & MSR_IA32_APICBASE_BASE;
1551 pr_info("Found and enabled local APIC!\n");
1558 pr_info("No local APIC present or hardware disabled\n");
1563 #ifdef CONFIG_X86_64
1564 void __init early_init_lapic_mapping(void)
1567 * If no local APIC can be found then go out
1568 * : it means there is no mpatable and MADT
1570 if (!smp_found_config)
1573 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
1574 apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
1575 APIC_BASE, mp_lapic_addr);
1578 * Fetch the APIC ID of the BSP in case we have a
1579 * default configuration (or the MP table is broken).
1581 boot_cpu_physical_apicid = read_apic_id();
1586 * init_apic_mappings - initialize APIC mappings
1588 void __init init_apic_mappings(void)
1590 unsigned int new_apicid;
1593 boot_cpu_physical_apicid = read_apic_id();
1597 /* If no local APIC can be found return early */
1598 if (!smp_found_config && detect_init_APIC()) {
1599 /* lets NOP'ify apic operations */
1600 pr_info("APIC: disable apic facility\n");
1603 apic_phys = mp_lapic_addr;
1606 * acpi lapic path already maps that address in
1607 * acpi_register_lapic_address()
1610 set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
1612 apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n",
1613 APIC_BASE, apic_phys);
1617 * Fetch the APIC ID of the BSP in case we have a
1618 * default configuration (or the MP table is broken).
1620 new_apicid = read_apic_id();
1621 if (boot_cpu_physical_apicid != new_apicid) {
1622 boot_cpu_physical_apicid = new_apicid;
1624 * yeah -- we lie about apic_version
1625 * in case if apic was disabled via boot option
1626 * but it's not a problem for SMP compiled kernel
1627 * since smp_sanity_check is prepared for such a case
1628 * and disable smp mode
1630 apic_version[new_apicid] =
1631 GET_APIC_VERSION(apic_read(APIC_LVR));
1636 * This initializes the IO-APIC and APIC hardware if this is
1639 int apic_version[MAX_APICS];
1641 int __init APIC_init_uniprocessor(void)
1644 pr_info("Apic disabled\n");
1647 #ifdef CONFIG_X86_64
1648 if (!cpu_has_apic) {
1650 pr_info("Apic disabled by BIOS\n");
1654 if (!smp_found_config && !cpu_has_apic)
1658 * Complain if the BIOS pretends there is one.
1660 if (!cpu_has_apic &&
1661 APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
1662 pr_err("BIOS bug, local APIC 0x%x not detected!...\n",
1663 boot_cpu_physical_apicid);
1670 default_setup_apic_routing();
1673 verify_local_APIC();
1676 #ifdef CONFIG_X86_64
1677 apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid));
1680 * Hack: In case of kdump, after a crash, kernel might be booting
1681 * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid
1682 * might be zero if read from MP tables. Get it from LAPIC.
1684 # ifdef CONFIG_CRASH_DUMP
1685 boot_cpu_physical_apicid = read_apic_id();
1688 physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
1691 #ifdef CONFIG_X86_IO_APIC
1693 * Now enable IO-APICs, actually call clear_IO_APIC
1694 * We need clear_IO_APIC before enabling error vector
1696 if (!skip_ioapic_setup && nr_ioapics)
1700 end_local_APIC_setup();
1702 #ifdef CONFIG_X86_IO_APIC
1703 if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
1707 localise_nmi_watchdog();
1710 localise_nmi_watchdog();
1713 x86_init.timers.setup_percpu_clockev();
1714 #ifdef CONFIG_X86_64
1715 check_nmi_watchdog();
1722 * Local APIC interrupts
1726 * This interrupt should _never_ happen with our APIC/SMP architecture
1728 void smp_spurious_interrupt(struct pt_regs *regs)
1735 * Check if this really is a spurious interrupt and ACK it
1736 * if it is a vectored one. Just in case...
1737 * Spurious interrupts should not be ACKed.
1739 v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1));
1740 if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f)))
1743 inc_irq_stat(irq_spurious_count);
1745 /* see sw-dev-man vol 3, chapter 7.4.13.5 */
1746 pr_info("spurious APIC interrupt on CPU#%d, "
1747 "should never happen.\n", smp_processor_id());
1752 * This interrupt should never happen with our APIC/SMP architecture
1754 void smp_error_interrupt(struct pt_regs *regs)
1760 /* First tickle the hardware, only then report what went on. -- REW */
1761 v = apic_read(APIC_ESR);
1762 apic_write(APIC_ESR, 0);
1763 v1 = apic_read(APIC_ESR);
1765 atomic_inc(&irq_err_count);
1768 * Here is what the APIC error bits mean:
1770 * 1: Receive CS error
1771 * 2: Send accept error
1772 * 3: Receive accept error
1774 * 5: Send illegal vector
1775 * 6: Received illegal vector
1776 * 7: Illegal register address
1778 pr_debug("APIC error on CPU%d: %02x(%02x)\n",
1779 smp_processor_id(), v , v1);
1784 * connect_bsp_APIC - attach the APIC to the interrupt system
1786 void __init connect_bsp_APIC(void)
1788 #ifdef CONFIG_X86_32
1791 * Do not trust the local APIC being empty at bootup.
1795 * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's
1796 * local APIC to INT and NMI lines.
1798 apic_printk(APIC_VERBOSE, "leaving PIC mode, "
1799 "enabling APIC mode.\n");
1803 if (apic->enable_apic_mode)
1804 apic->enable_apic_mode();
1808 * disconnect_bsp_APIC - detach the APIC from the interrupt system
1809 * @virt_wire_setup: indicates, whether virtual wire mode is selected
1811 * Virtual wire mode is necessary to deliver legacy interrupts even when the
1814 void disconnect_bsp_APIC(int virt_wire_setup)
1818 #ifdef CONFIG_X86_32
1821 * Put the board back into PIC mode (has an effect only on
1822 * certain older boards). Note that APIC interrupts, including
1823 * IPIs, won't work beyond this point! The only exception are
1826 apic_printk(APIC_VERBOSE, "disabling APIC mode, "
1827 "entering PIC mode.\n");
1833 /* Go back to Virtual Wire compatibility mode */
1835 /* For the spurious interrupt use vector F, and enable it */
1836 value = apic_read(APIC_SPIV);
1837 value &= ~APIC_VECTOR_MASK;
1838 value |= APIC_SPIV_APIC_ENABLED;
1840 apic_write(APIC_SPIV, value);
1842 if (!virt_wire_setup) {
1844 * For LVT0 make it edge triggered, active high,
1845 * external and enabled
1847 value = apic_read(APIC_LVT0);
1848 value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
1849 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
1850 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
1851 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
1852 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
1853 apic_write(APIC_LVT0, value);
1856 apic_write(APIC_LVT0, APIC_LVT_MASKED);
1860 * For LVT1 make it edge triggered, active high,
1863 value = apic_read(APIC_LVT1);
1864 value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
1865 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
1866 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
1867 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
1868 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
1869 apic_write(APIC_LVT1, value);
1872 void __cpuinit generic_processor_info(int apicid, int version)
1879 if (version == 0x0) {
1880 pr_warning("BIOS bug, APIC version is 0 for CPU#%d! "
1881 "fixing up to 0x10. (tell your hw vendor)\n",
1885 apic_version[apicid] = version;
1887 if (num_processors >= nr_cpu_ids) {
1888 int max = nr_cpu_ids;
1889 int thiscpu = max + disabled_cpus;
1892 "ACPI: NR_CPUS/possible_cpus limit of %i reached."
1893 " Processor %d/0x%x ignored.\n", max, thiscpu, apicid);
1900 cpu = cpumask_next_zero(-1, cpu_present_mask);
1902 if (version != apic_version[boot_cpu_physical_apicid])
1904 "ACPI: apic version mismatch, bootcpu: %x cpu %d: %x\n",
1905 apic_version[boot_cpu_physical_apicid], cpu, version);
1907 physid_set(apicid, phys_cpu_present_map);
1908 if (apicid == boot_cpu_physical_apicid) {
1910 * x86_bios_cpu_apicid is required to have processors listed
1911 * in same order as logical cpu numbers. Hence the first
1912 * entry is BSP, and so on.
1916 if (apicid > max_physical_apicid)
1917 max_physical_apicid = apicid;
1919 #if defined(CONFIG_SMP) || defined(CONFIG_X86_64)
1920 early_per_cpu(x86_cpu_to_apicid, cpu) = apicid;
1921 early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
1924 set_cpu_possible(cpu, true);
1925 set_cpu_present(cpu, true);
1928 int hard_smp_processor_id(void)
1930 return read_apic_id();
1933 void default_init_apic_ldr(void)
1937 apic_write(APIC_DFR, APIC_DFR_VALUE);
1938 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
1939 val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
1940 apic_write(APIC_LDR, val);
1943 #ifdef CONFIG_X86_32
1944 int default_apicid_to_node(int logical_apicid)
1947 return apicid_2_node[hard_smp_processor_id()];
1961 * 'active' is true if the local APIC was enabled by us and
1962 * not the BIOS; this signifies that we are also responsible
1963 * for disabling it before entering apm/acpi suspend
1966 /* r/w apic fields */
1967 unsigned int apic_id;
1968 unsigned int apic_taskpri;
1969 unsigned int apic_ldr;
1970 unsigned int apic_dfr;
1971 unsigned int apic_spiv;
1972 unsigned int apic_lvtt;
1973 unsigned int apic_lvtpc;
1974 unsigned int apic_lvt0;
1975 unsigned int apic_lvt1;
1976 unsigned int apic_lvterr;
1977 unsigned int apic_tmict;
1978 unsigned int apic_tdcr;
1979 unsigned int apic_thmr;
1982 static int lapic_suspend(struct sys_device *dev, pm_message_t state)
1984 unsigned long flags;
1987 if (!apic_pm_state.active)
1990 maxlvt = lapic_get_maxlvt();
1992 apic_pm_state.apic_id = apic_read(APIC_ID);
1993 apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI);
1994 apic_pm_state.apic_ldr = apic_read(APIC_LDR);
1995 apic_pm_state.apic_dfr = apic_read(APIC_DFR);
1996 apic_pm_state.apic_spiv = apic_read(APIC_SPIV);
1997 apic_pm_state.apic_lvtt = apic_read(APIC_LVTT);
1999 apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC);
2000 apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0);
2001 apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1);
2002 apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR);
2003 apic_pm_state.apic_tmict = apic_read(APIC_TMICT);
2004 apic_pm_state.apic_tdcr = apic_read(APIC_TDCR);
2005 #ifdef CONFIG_X86_THERMAL_VECTOR
2007 apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR);
2010 local_irq_save(flags);
2011 disable_local_APIC();
2013 if (intr_remapping_enabled)
2014 disable_intr_remapping();
2016 local_irq_restore(flags);
2020 static int lapic_resume(struct sys_device *dev)
2023 unsigned long flags;
2026 struct IO_APIC_route_entry **ioapic_entries = NULL;
2028 if (!apic_pm_state.active)
2031 local_irq_save(flags);
2032 if (intr_remapping_enabled) {
2033 ioapic_entries = alloc_ioapic_entries();
2034 if (!ioapic_entries) {
2035 WARN(1, "Alloc ioapic_entries in lapic resume failed.");
2040 ret = save_IO_APIC_setup(ioapic_entries);
2042 WARN(1, "Saving IO-APIC state failed: %d\n", ret);
2043 free_ioapic_entries(ioapic_entries);
2047 mask_IO_APIC_setup(ioapic_entries);
2048 legacy_pic->mask_all();
2055 * Make sure the APICBASE points to the right address
2057 * FIXME! This will be wrong if we ever support suspend on
2058 * SMP! We'll need to do this as part of the CPU restore!
2060 rdmsr(MSR_IA32_APICBASE, l, h);
2061 l &= ~MSR_IA32_APICBASE_BASE;
2062 l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
2063 wrmsr(MSR_IA32_APICBASE, l, h);
2066 maxlvt = lapic_get_maxlvt();
2067 apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED);
2068 apic_write(APIC_ID, apic_pm_state.apic_id);
2069 apic_write(APIC_DFR, apic_pm_state.apic_dfr);
2070 apic_write(APIC_LDR, apic_pm_state.apic_ldr);
2071 apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri);
2072 apic_write(APIC_SPIV, apic_pm_state.apic_spiv);
2073 apic_write(APIC_LVT0, apic_pm_state.apic_lvt0);
2074 apic_write(APIC_LVT1, apic_pm_state.apic_lvt1);
2075 #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL)
2077 apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr);
2080 apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc);
2081 apic_write(APIC_LVTT, apic_pm_state.apic_lvtt);
2082 apic_write(APIC_TDCR, apic_pm_state.apic_tdcr);
2083 apic_write(APIC_TMICT, apic_pm_state.apic_tmict);
2084 apic_write(APIC_ESR, 0);
2085 apic_read(APIC_ESR);
2086 apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr);
2087 apic_write(APIC_ESR, 0);
2088 apic_read(APIC_ESR);
2090 if (intr_remapping_enabled) {
2091 reenable_intr_remapping(x2apic_mode);
2092 legacy_pic->restore_mask();
2093 restore_IO_APIC_setup(ioapic_entries);
2094 free_ioapic_entries(ioapic_entries);
2097 local_irq_restore(flags);
2103 * This device has no shutdown method - fully functioning local APICs
2104 * are needed on every CPU up until machine_halt/restart/poweroff.
2107 static struct sysdev_class lapic_sysclass = {
2109 .resume = lapic_resume,
2110 .suspend = lapic_suspend,
2113 static struct sys_device device_lapic = {
2115 .cls = &lapic_sysclass,
2118 static void __cpuinit apic_pm_activate(void)
2120 apic_pm_state.active = 1;
2123 static int __init init_lapic_sysfs(void)
2129 /* XXX: remove suspend/resume procs if !apic_pm_state.active? */
2131 error = sysdev_class_register(&lapic_sysclass);
2133 error = sysdev_register(&device_lapic);
2137 /* local apic needs to resume before other devices access its registers. */
2138 core_initcall(init_lapic_sysfs);
2140 #else /* CONFIG_PM */
2142 static void apic_pm_activate(void) { }
2144 #endif /* CONFIG_PM */
2146 #ifdef CONFIG_X86_64
2148 static int __cpuinit apic_cluster_num(void)
2150 int i, clusters, zeros;
2152 u16 *bios_cpu_apicid;
2153 DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS);
2155 bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid);
2156 bitmap_zero(clustermap, NUM_APIC_CLUSTERS);
2158 for (i = 0; i < nr_cpu_ids; i++) {
2159 /* are we being called early in kernel startup? */
2160 if (bios_cpu_apicid) {
2161 id = bios_cpu_apicid[i];
2162 } else if (i < nr_cpu_ids) {
2164 id = per_cpu(x86_bios_cpu_apicid, i);
2170 if (id != BAD_APICID)
2171 __set_bit(APIC_CLUSTERID(id), clustermap);
2174 /* Problem: Partially populated chassis may not have CPUs in some of
2175 * the APIC clusters they have been allocated. Only present CPUs have
2176 * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap.
2177 * Since clusters are allocated sequentially, count zeros only if
2178 * they are bounded by ones.
2182 for (i = 0; i < NUM_APIC_CLUSTERS; i++) {
2183 if (test_bit(i, clustermap)) {
2184 clusters += 1 + zeros;
2193 static int __cpuinitdata multi_checked;
2194 static int __cpuinitdata multi;
2196 static int __cpuinit set_multi(const struct dmi_system_id *d)
2200 pr_info("APIC: %s detected, Multi Chassis\n", d->ident);
2205 static const __cpuinitconst struct dmi_system_id multi_dmi_table[] = {
2207 .callback = set_multi,
2208 .ident = "IBM System Summit2",
2210 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2211 DMI_MATCH(DMI_PRODUCT_NAME, "Summit2"),
2217 static void __cpuinit dmi_check_multi(void)
2222 dmi_check_system(multi_dmi_table);
2227 * apic_is_clustered_box() -- Check if we can expect good TSC
2229 * Thus far, the major user of this is IBM's Summit2 series:
2230 * Clustered boxes may have unsynced TSC problems if they are
2232 * Use DMI to check them
2234 __cpuinit int apic_is_clustered_box(void)
2244 * ScaleMP vSMPowered boxes have one cluster per board and TSCs are
2245 * not guaranteed to be synced between boards
2247 if (apic_cluster_num() > 1)
2255 * APIC command line parameters
2257 static int __init setup_disableapic(char *arg)
2260 setup_clear_cpu_cap(X86_FEATURE_APIC);
2263 early_param("disableapic", setup_disableapic);
2265 /* same as disableapic, for compatibility */
2266 static int __init setup_nolapic(char *arg)
2268 return setup_disableapic(arg);
2270 early_param("nolapic", setup_nolapic);
2272 static int __init parse_lapic_timer_c2_ok(char *arg)
2274 local_apic_timer_c2_ok = 1;
2277 early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
2279 static int __init parse_disable_apic_timer(char *arg)
2281 disable_apic_timer = 1;
2284 early_param("noapictimer", parse_disable_apic_timer);
2286 static int __init parse_nolapic_timer(char *arg)
2288 disable_apic_timer = 1;
2291 early_param("nolapic_timer", parse_nolapic_timer);
2293 static int __init apic_set_verbosity(char *arg)
2296 #ifdef CONFIG_X86_64
2297 skip_ioapic_setup = 0;
2303 if (strcmp("debug", arg) == 0)
2304 apic_verbosity = APIC_DEBUG;
2305 else if (strcmp("verbose", arg) == 0)
2306 apic_verbosity = APIC_VERBOSE;
2308 pr_warning("APIC Verbosity level %s not recognised"
2309 " use apic=verbose or apic=debug\n", arg);
2315 early_param("apic", apic_set_verbosity);
2317 static int __init lapic_insert_resource(void)
2322 /* Put local APIC into the resource map. */
2323 lapic_resource.start = apic_phys;
2324 lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1;
2325 insert_resource(&iomem_resource, &lapic_resource);
2331 * need call insert after e820_reserve_resources()
2332 * that is using request_resource
2334 late_initcall(lapic_insert_resource);