2 * Local APIC handling, local APIC timers
4 * (c) 1999, 2000 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/init.h>
20 #include <linux/delay.h>
21 #include <linux/bootmem.h>
22 #include <linux/interrupt.h>
23 #include <linux/mc146818rtc.h>
24 #include <linux/kernel_stat.h>
25 #include <linux/sysdev.h>
26 #include <linux/cpu.h>
27 #include <linux/clockchips.h>
28 #include <linux/acpi_pmtmr.h>
29 #include <linux/module.h>
30 #include <linux/dmi.h>
32 #include <asm/atomic.h>
35 #include <asm/mpspec.h>
37 #include <asm/arch_hooks.h>
39 #include <asm/i8253.h>
42 #include <mach_apic.h>
43 #include <mach_apicdef.h>
49 #if ((SPURIOUS_APIC_VECTOR & 0x0F) != 0x0F)
50 # error SPURIOUS_APIC_VECTOR definition error
53 unsigned long mp_lapic_addr;
56 * Knob to control our willingness to enable the local APIC.
60 static int force_enable_local_apic;
63 /* Local APIC timer verification ok */
64 static int local_apic_timer_verify_ok;
65 /* Disable local APIC timer from the kernel commandline or via dmi quirk */
66 static int local_apic_timer_disabled;
67 /* Local APIC timer works in C2 */
68 int local_apic_timer_c2_ok;
69 EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
71 int first_system_vector = 0xfe;
73 char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
76 * Debug level, exported for io_apic.c
78 unsigned int apic_verbosity;
82 /* Have we found an MP table */
85 static struct resource lapic_resource = {
87 .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
90 static unsigned int calibration_result;
92 static int lapic_next_event(unsigned long delta,
93 struct clock_event_device *evt);
94 static void lapic_timer_setup(enum clock_event_mode mode,
95 struct clock_event_device *evt);
96 static void lapic_timer_broadcast(cpumask_t mask);
97 static void apic_pm_activate(void);
100 * The local apic timer can be used for any function which is CPU local.
102 static struct clock_event_device lapic_clockevent = {
104 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT
105 | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY,
107 .set_mode = lapic_timer_setup,
108 .set_next_event = lapic_next_event,
109 .broadcast = lapic_timer_broadcast,
113 static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
115 /* Local APIC was disabled by the BIOS and enabled by the kernel */
116 static int enabled_via_apicbase;
118 static unsigned long apic_phys;
121 * Get the LAPIC version
123 static inline int lapic_get_version(void)
125 return GET_APIC_VERSION(apic_read(APIC_LVR));
129 * Check, if the APIC is integrated or a separate chip
131 static inline int lapic_is_integrated(void)
133 return APIC_INTEGRATED(lapic_get_version());
137 * Check, whether this is a modern or a first generation APIC
139 static int modern_apic(void)
141 /* AMD systems use old APIC versions, so check the CPU */
142 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
143 boot_cpu_data.x86 >= 0xf)
145 return lapic_get_version() >= 0x14;
148 void apic_wait_icr_idle(void)
150 while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
154 u32 safe_apic_wait_icr_idle(void)
161 send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
165 } while (timeout++ < 1000);
171 * enable_NMI_through_LVT0 - enable NMI through local vector table 0
173 void __cpuinit enable_NMI_through_LVT0(void)
177 /* unmask and set to NMI */
180 /* Level triggered for 82489DX (32bit mode) */
181 if (!lapic_is_integrated())
182 v |= APIC_LVT_LEVEL_TRIGGER;
184 apic_write(APIC_LVT0, v);
188 * get_physical_broadcast - Get number of physical broadcast IDs
190 int get_physical_broadcast(void)
192 return modern_apic() ? 0xff : 0xf;
196 * lapic_get_maxlvt - get the maximum number of local vector table entries
198 int lapic_get_maxlvt(void)
202 v = apic_read(APIC_LVR);
204 * - we always have APIC integrated on 64bit mode
205 * - 82489DXs do not report # of LVT entries
207 return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2;
214 /* Clock divisor is set to 16 */
215 #define APIC_DIVISOR 16
218 * This function sets up the local APIC timer, with a timeout of
219 * 'clocks' APIC bus clock. During calibration we actually call
220 * this function twice on the boot CPU, once with a bogus timeout
221 * value, second time for real. The other (noncalibrating) CPUs
222 * call this function only once, with the real, calibrated value.
224 static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
226 unsigned int lvtt_value, tmp_value;
228 lvtt_value = LOCAL_TIMER_VECTOR;
230 lvtt_value |= APIC_LVT_TIMER_PERIODIC;
231 if (!lapic_is_integrated())
232 lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV);
235 lvtt_value |= APIC_LVT_MASKED;
237 apic_write(APIC_LVTT, lvtt_value);
242 tmp_value = apic_read(APIC_TDCR);
243 apic_write(APIC_TDCR,
244 (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) |
248 apic_write(APIC_TMICT, clocks / APIC_DIVISOR);
252 * Program the next event, relative to now
254 static int lapic_next_event(unsigned long delta,
255 struct clock_event_device *evt)
257 apic_write(APIC_TMICT, delta);
262 * Setup the lapic timer in periodic or oneshot mode
264 static void lapic_timer_setup(enum clock_event_mode mode,
265 struct clock_event_device *evt)
270 /* Lapic used for broadcast ? */
271 if (!local_apic_timer_verify_ok)
274 local_irq_save(flags);
277 case CLOCK_EVT_MODE_PERIODIC:
278 case CLOCK_EVT_MODE_ONESHOT:
279 __setup_APIC_LVTT(calibration_result,
280 mode != CLOCK_EVT_MODE_PERIODIC, 1);
282 case CLOCK_EVT_MODE_UNUSED:
283 case CLOCK_EVT_MODE_SHUTDOWN:
284 v = apic_read(APIC_LVTT);
285 v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
286 apic_write(APIC_LVTT, v);
288 case CLOCK_EVT_MODE_RESUME:
289 /* Nothing to do here */
293 local_irq_restore(flags);
297 * Local APIC timer broadcast function
299 static void lapic_timer_broadcast(cpumask_t mask)
302 send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
307 * Setup the local APIC timer for this CPU. Copy the initilized values
308 * of the boot CPU and register the clock event in the framework.
310 static void __devinit setup_APIC_timer(void)
312 struct clock_event_device *levt = &__get_cpu_var(lapic_events);
314 memcpy(levt, &lapic_clockevent, sizeof(*levt));
315 levt->cpumask = cpumask_of_cpu(smp_processor_id());
317 clockevents_register_device(levt);
321 * In this functions we calibrate APIC bus clocks to the external timer.
323 * We want to do the calibration only once since we want to have local timer
324 * irqs syncron. CPUs connected by the same APIC bus have the very same bus
327 * This was previously done by reading the PIT/HPET and waiting for a wrap
328 * around to find out, that a tick has elapsed. I have a box, where the PIT
329 * readout is broken, so it never gets out of the wait loop again. This was
330 * also reported by others.
332 * Monitoring the jiffies value is inaccurate and the clockevents
333 * infrastructure allows us to do a simple substitution of the interrupt
336 * The calibration routine also uses the pm_timer when possible, as the PIT
337 * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes
338 * back to normal later in the boot process).
341 #define LAPIC_CAL_LOOPS (HZ/10)
343 static __initdata int lapic_cal_loops = -1;
344 static __initdata long lapic_cal_t1, lapic_cal_t2;
345 static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2;
346 static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2;
347 static __initdata unsigned long lapic_cal_j1, lapic_cal_j2;
350 * Temporary interrupt handler.
352 static void __init lapic_cal_handler(struct clock_event_device *dev)
354 unsigned long long tsc = 0;
355 long tapic = apic_read(APIC_TMCCT);
356 unsigned long pm = acpi_pm_read_early();
361 switch (lapic_cal_loops++) {
363 lapic_cal_t1 = tapic;
364 lapic_cal_tsc1 = tsc;
366 lapic_cal_j1 = jiffies;
369 case LAPIC_CAL_LOOPS:
370 lapic_cal_t2 = tapic;
371 lapic_cal_tsc2 = tsc;
372 if (pm < lapic_cal_pm1)
373 pm += ACPI_PM_OVRRUN;
375 lapic_cal_j2 = jiffies;
380 static int __init calibrate_APIC_clock(void)
382 struct clock_event_device *levt = &__get_cpu_var(lapic_events);
383 const long pm_100ms = PMTMR_TICKS_PER_SEC/10;
384 const long pm_thresh = pm_100ms/100;
385 void (*real_handler)(struct clock_event_device *dev);
386 unsigned long deltaj;
388 int pm_referenced = 0;
392 /* Replace the global interrupt handler */
393 real_handler = global_clock_event->event_handler;
394 global_clock_event->event_handler = lapic_cal_handler;
397 * Setup the APIC counter to 1e9. There is no way the lapic
398 * can underflow in the 100ms detection time frame
400 __setup_APIC_LVTT(1000000000, 0, 0);
402 /* Let the interrupts run */
405 while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
410 /* Restore the real event handler */
411 global_clock_event->event_handler = real_handler;
413 /* Build delta t1-t2 as apic timer counts down */
414 delta = lapic_cal_t1 - lapic_cal_t2;
415 apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta);
417 /* Check, if the PM timer is available */
418 deltapm = lapic_cal_pm2 - lapic_cal_pm1;
419 apic_printk(APIC_VERBOSE, "... PM timer delta = %ld\n", deltapm);
425 mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22);
427 if (deltapm > (pm_100ms - pm_thresh) &&
428 deltapm < (pm_100ms + pm_thresh)) {
429 apic_printk(APIC_VERBOSE, "... PM timer result ok\n");
431 res = (((u64) deltapm) * mult) >> 22;
432 do_div(res, 1000000);
433 printk(KERN_WARNING "APIC calibration not consistent "
434 "with PM Timer: %ldms instead of 100ms\n",
436 /* Correct the lapic counter value */
437 res = (((u64) delta) * pm_100ms);
438 do_div(res, deltapm);
439 printk(KERN_INFO "APIC delta adjusted to PM-Timer: "
440 "%lu (%ld)\n", (unsigned long) res, delta);
446 /* Calculate the scaled math multiplication factor */
447 lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
448 lapic_clockevent.shift);
449 lapic_clockevent.max_delta_ns =
450 clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
451 lapic_clockevent.min_delta_ns =
452 clockevent_delta2ns(0xF, &lapic_clockevent);
454 calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
456 apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
457 apic_printk(APIC_VERBOSE, "..... mult: %ld\n", lapic_clockevent.mult);
458 apic_printk(APIC_VERBOSE, "..... calibration result: %u\n",
462 delta = (long)(lapic_cal_tsc2 - lapic_cal_tsc1);
463 apic_printk(APIC_VERBOSE, "..... CPU clock speed is "
465 (delta / LAPIC_CAL_LOOPS) / (1000000 / HZ),
466 (delta / LAPIC_CAL_LOOPS) % (1000000 / HZ));
469 apic_printk(APIC_VERBOSE, "..... host bus clock speed is "
471 calibration_result / (1000000 / HZ),
472 calibration_result % (1000000 / HZ));
475 * Do a sanity check on the APIC calibration result
477 if (calibration_result < (1000000 / HZ)) {
480 "APIC frequency too slow, disabling apic timer\n");
484 local_apic_timer_verify_ok = 1;
486 /* We trust the pm timer based calibration */
487 if (!pm_referenced) {
488 apic_printk(APIC_VERBOSE, "... verify APIC timer\n");
491 * Setup the apic timer manually
493 levt->event_handler = lapic_cal_handler;
494 lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt);
495 lapic_cal_loops = -1;
497 /* Let the interrupts run */
500 while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
505 /* Stop the lapic timer */
506 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt);
511 deltaj = lapic_cal_j2 - lapic_cal_j1;
512 apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj);
514 /* Check, if the jiffies result is consistent */
515 if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2)
516 apic_printk(APIC_VERBOSE, "... jiffies result ok\n");
518 local_apic_timer_verify_ok = 0;
522 if (!local_apic_timer_verify_ok) {
524 "APIC timer disabled due to verification failure.\n");
532 * Setup the boot APIC
534 * Calibrate and verify the result.
536 void __init setup_boot_APIC_clock(void)
539 * The local apic timer can be disabled via the kernel
540 * commandline or from the CPU detection code. Register the lapic
541 * timer as a dummy clock event source on SMP systems, so the
542 * broadcast mechanism is used. On UP systems simply ignore it.
544 if (local_apic_timer_disabled) {
545 /* No broadcast on UP ! */
546 if (num_possible_cpus() > 1) {
547 lapic_clockevent.mult = 1;
553 apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n"
554 "calibrating APIC timer ...\n");
556 if (calibrate_APIC_clock()) {
557 /* No broadcast on UP ! */
558 if (num_possible_cpus() > 1)
564 * If nmi_watchdog is set to IO_APIC, we need the
565 * PIT/HPET going. Otherwise register lapic as a dummy
568 if (nmi_watchdog != NMI_IO_APIC)
569 lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
571 printk(KERN_WARNING "APIC timer registered as dummy,"
572 " due to nmi_watchdog=%d!\n", nmi_watchdog);
574 /* Setup the lapic or request the broadcast */
578 void __devinit setup_secondary_APIC_clock(void)
584 * The guts of the apic timer interrupt
586 static void local_apic_timer_interrupt(void)
588 int cpu = smp_processor_id();
589 struct clock_event_device *evt = &per_cpu(lapic_events, cpu);
592 * Normally we should not be here till LAPIC has been initialized but
593 * in some cases like kdump, its possible that there is a pending LAPIC
594 * timer interrupt from previous kernel's context and is delivered in
595 * new kernel the moment interrupts are enabled.
597 * Interrupts are enabled early and LAPIC is setup much later, hence
598 * its possible that when we get here evt->event_handler is NULL.
599 * Check for event_handler being NULL and discard the interrupt as
602 if (!evt->event_handler) {
604 "Spurious LAPIC timer interrupt on cpu %d\n", cpu);
606 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt);
611 * the NMI deadlock-detector uses this.
613 per_cpu(irq_stat, cpu).apic_timer_irqs++;
615 evt->event_handler(evt);
619 * Local APIC timer interrupt. This is the most natural way for doing
620 * local interrupts, but local timer interrupts can be emulated by
621 * broadcast interrupts too. [in case the hw doesn't support APIC timers]
623 * [ if a single-CPU system runs an SMP kernel then we call the local
624 * interrupt as well. Thus we cannot inline the local irq ... ]
626 void smp_apic_timer_interrupt(struct pt_regs *regs)
628 struct pt_regs *old_regs = set_irq_regs(regs);
631 * NOTE! We'd better ACK the irq immediately,
632 * because timer handling can be slow.
636 * update_process_times() expects us to have done irq_enter().
637 * Besides, if we don't timer interrupts ignore the global
638 * interrupt lock, which is the WrongThing (tm) to do.
641 local_apic_timer_interrupt();
644 set_irq_regs(old_regs);
647 int setup_profiling_timer(unsigned int multiplier)
653 * Setup extended LVT, AMD specific (K8, family 10h)
655 * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and
656 * MCE interrupts are supported. Thus MCE offset must be set to 0.
659 #define APIC_EILVT_LVTOFF_MCE 0
660 #define APIC_EILVT_LVTOFF_IBS 1
662 static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask)
664 unsigned long reg = (lvt_off << 4) + APIC_EILVT0;
665 unsigned int v = (mask << 16) | (msg_type << 8) | vector;
669 u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask)
671 setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask);
672 return APIC_EILVT_LVTOFF_MCE;
675 u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask)
677 setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask);
678 return APIC_EILVT_LVTOFF_IBS;
682 * Local APIC start and shutdown
686 * clear_local_APIC - shutdown the local APIC
688 * This is called, when a CPU is disabled and before rebooting, so the state of
689 * the local APIC has no dangling leftovers. Also used to cleanout any BIOS
690 * leftovers during boot.
692 void clear_local_APIC(void)
697 /* APIC hasn't been mapped yet */
701 maxlvt = lapic_get_maxlvt();
703 * Masking an LVT entry can trigger a local APIC error
704 * if the vector is zero. Mask LVTERR first to prevent this.
707 v = ERROR_APIC_VECTOR; /* any non-zero vector will do */
708 apic_write(APIC_LVTERR, v | APIC_LVT_MASKED);
711 * Careful: we have to set masks only first to deassert
712 * any level-triggered sources.
714 v = apic_read(APIC_LVTT);
715 apic_write(APIC_LVTT, v | APIC_LVT_MASKED);
716 v = apic_read(APIC_LVT0);
717 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
718 v = apic_read(APIC_LVT1);
719 apic_write(APIC_LVT1, v | APIC_LVT_MASKED);
721 v = apic_read(APIC_LVTPC);
722 apic_write(APIC_LVTPC, v | APIC_LVT_MASKED);
725 /* lets not touch this if we didn't frob it */
726 #ifdef CONFIG_X86_MCE_P4THERMAL
728 v = apic_read(APIC_LVTTHMR);
729 apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED);
733 * Clean APIC state for other OSs:
735 apic_write(APIC_LVTT, APIC_LVT_MASKED);
736 apic_write(APIC_LVT0, APIC_LVT_MASKED);
737 apic_write(APIC_LVT1, APIC_LVT_MASKED);
739 apic_write(APIC_LVTERR, APIC_LVT_MASKED);
741 apic_write(APIC_LVTPC, APIC_LVT_MASKED);
743 #ifdef CONFIG_X86_MCE_P4THERMAL
745 apic_write(APIC_LVTTHMR, APIC_LVT_MASKED);
747 /* Integrated APIC (!82489DX) ? */
748 if (lapic_is_integrated()) {
750 /* Clear ESR due to Pentium errata 3AP and 11AP */
751 apic_write(APIC_ESR, 0);
757 * disable_local_APIC - clear and disable the local APIC
759 void disable_local_APIC(void)
766 * Disable APIC (implies clearing of registers
769 value = apic_read(APIC_SPIV);
770 value &= ~APIC_SPIV_APIC_ENABLED;
771 apic_write(APIC_SPIV, value);
774 * When LAPIC was disabled by the BIOS and enabled by the kernel,
775 * restore the disabled state.
777 if (enabled_via_apicbase) {
780 rdmsr(MSR_IA32_APICBASE, l, h);
781 l &= ~MSR_IA32_APICBASE_ENABLE;
782 wrmsr(MSR_IA32_APICBASE, l, h);
787 * If Linux enabled the LAPIC against the BIOS default disable it down before
788 * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and
789 * not power-off. Additionally clear all LVT entries before disable_local_APIC
790 * for the case where Linux didn't enable the LAPIC.
792 void lapic_shutdown(void)
799 local_irq_save(flags);
802 if (enabled_via_apicbase)
803 disable_local_APIC();
805 local_irq_restore(flags);
809 * This is to verify that we're looking at a real local APIC.
810 * Check these against your board if the CPUs aren't getting
811 * started for no apparent reason.
813 int __init verify_local_APIC(void)
815 unsigned int reg0, reg1;
818 * The version register is read-only in a real APIC.
820 reg0 = apic_read(APIC_LVR);
821 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0);
822 apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK);
823 reg1 = apic_read(APIC_LVR);
824 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1);
827 * The two version reads above should print the same
828 * numbers. If the second one is different, then we
829 * poke at a non-APIC.
835 * Check if the version looks reasonably.
837 reg1 = GET_APIC_VERSION(reg0);
838 if (reg1 == 0x00 || reg1 == 0xff)
840 reg1 = lapic_get_maxlvt();
841 if (reg1 < 0x02 || reg1 == 0xff)
845 * The ID register is read/write in a real APIC.
847 reg0 = apic_read(APIC_ID);
848 apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
851 * The next two are just to see if we have sane values.
852 * They're only really relevant if we're in Virtual Wire
853 * compatibility mode, but most boxes are anymore.
855 reg0 = apic_read(APIC_LVT0);
856 apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0);
857 reg1 = apic_read(APIC_LVT1);
858 apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1);
864 * sync_Arb_IDs - synchronize APIC bus arbitration IDs
866 void __init sync_Arb_IDs(void)
869 * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
872 if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
877 apic_wait_icr_idle();
879 apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n");
881 APIC_DEST_ALLINC | APIC_INT_LEVELTRIG | APIC_DM_INIT);
885 * An initial setup of the virtual wire mode.
887 void __init init_bsp_APIC(void)
892 * Don't do the setup now if we have a SMP BIOS as the
893 * through-I/O-APIC virtual wire mode might be active.
895 if (smp_found_config || !cpu_has_apic)
899 * Do not trust the local APIC being empty at bootup.
906 value = apic_read(APIC_SPIV);
907 value &= ~APIC_VECTOR_MASK;
908 value |= APIC_SPIV_APIC_ENABLED;
910 /* This bit is reserved on P4/Xeon and should be cleared */
911 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
912 (boot_cpu_data.x86 == 15))
913 value &= ~APIC_SPIV_FOCUS_DISABLED;
915 value |= APIC_SPIV_FOCUS_DISABLED;
916 value |= SPURIOUS_APIC_VECTOR;
917 apic_write(APIC_SPIV, value);
920 * Set up the virtual wire mode.
922 apic_write(APIC_LVT0, APIC_DM_EXTINT);
924 if (!lapic_is_integrated()) /* 82489DX */
925 value |= APIC_LVT_LEVEL_TRIGGER;
926 apic_write(APIC_LVT1, value);
929 static void __cpuinit lapic_setup_esr(void)
931 unsigned long oldvalue, value, maxlvt;
932 if (lapic_is_integrated() && !esr_disable) {
934 maxlvt = lapic_get_maxlvt();
935 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
936 apic_write(APIC_ESR, 0);
937 oldvalue = apic_read(APIC_ESR);
939 /* enables sending errors */
940 value = ERROR_APIC_VECTOR;
941 apic_write(APIC_LVTERR, value);
943 * spec says clear errors after enabling vector.
946 apic_write(APIC_ESR, 0);
947 value = apic_read(APIC_ESR);
948 if (value != oldvalue)
949 apic_printk(APIC_VERBOSE, "ESR value before enabling "
950 "vector: 0x%08lx after: 0x%08lx\n",
955 * Something untraceable is creating bad interrupts on
956 * secondary quads ... for the moment, just leave the
957 * ESR disabled - we can't do anything useful with the
958 * errors anyway - mbligh
960 printk(KERN_INFO "Leaving ESR disabled.\n");
962 printk(KERN_INFO "No ESR for 82489DX.\n");
968 * setup_local_APIC - setup the local APIC
970 void __cpuinit setup_local_APIC(void)
972 unsigned long value, integrated;
975 /* Pound the ESR really hard over the head with a big hammer - mbligh */
977 apic_write(APIC_ESR, 0);
978 apic_write(APIC_ESR, 0);
979 apic_write(APIC_ESR, 0);
980 apic_write(APIC_ESR, 0);
983 integrated = lapic_is_integrated();
986 * Double-check whether this APIC is really registered.
988 if (!apic_id_registered())
992 * Intel recommends to set DFR, LDR and TPR before enabling
993 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
994 * document number 292116). So here it goes...
999 * Set Task Priority to 'accept all'. We never change this
1002 value = apic_read(APIC_TASKPRI);
1003 value &= ~APIC_TPRI_MASK;
1004 apic_write(APIC_TASKPRI, value);
1007 * After a crash, we no longer service the interrupts and a pending
1008 * interrupt from previous kernel might still have ISR bit set.
1010 * Most probably by now CPU has serviced that pending interrupt and
1011 * it might not have done the ack_APIC_irq() because it thought,
1012 * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it
1013 * does not clear the ISR bit and cpu thinks it has already serivced
1014 * the interrupt. Hence a vector might get locked. It was noticed
1015 * for timer irq (vector 0x31). Issue an extra EOI to clear ISR.
1017 for (i = APIC_ISR_NR - 1; i >= 0; i--) {
1018 value = apic_read(APIC_ISR + i*0x10);
1019 for (j = 31; j >= 0; j--) {
1026 * Now that we are all set up, enable the APIC
1028 value = apic_read(APIC_SPIV);
1029 value &= ~APIC_VECTOR_MASK;
1033 value |= APIC_SPIV_APIC_ENABLED;
1036 * Some unknown Intel IO/APIC (or APIC) errata is biting us with
1037 * certain networking cards. If high frequency interrupts are
1038 * happening on a particular IOAPIC pin, plus the IOAPIC routing
1039 * entry is masked/unmasked at a high rate as well then sooner or
1040 * later IOAPIC line gets 'stuck', no more interrupts are received
1041 * from the device. If focus CPU is disabled then the hang goes
1044 * [ This bug can be reproduced easily with a level-triggered
1045 * PCI Ne2000 networking cards and PII/PIII processors, dual
1049 * Actually disabling the focus CPU check just makes the hang less
1050 * frequent as it makes the interrupt distributon model be more
1051 * like LRU than MRU (the short-term load is more even across CPUs).
1052 * See also the comment in end_level_ioapic_irq(). --macro
1055 /* Enable focus processor (bit==0) */
1056 value &= ~APIC_SPIV_FOCUS_DISABLED;
1059 * Set spurious IRQ vector
1061 value |= SPURIOUS_APIC_VECTOR;
1062 apic_write(APIC_SPIV, value);
1065 * Set up LVT0, LVT1:
1067 * set up through-local-APIC on the BP's LINT0. This is not
1068 * strictly necessary in pure symmetric-IO mode, but sometimes
1069 * we delegate interrupts to the 8259A.
1072 * TODO: set up through-local-APIC from through-I/O-APIC? --macro
1074 value = apic_read(APIC_LVT0) & APIC_LVT_MASKED;
1075 if (!smp_processor_id() && (pic_mode || !value)) {
1076 value = APIC_DM_EXTINT;
1077 apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n",
1078 smp_processor_id());
1080 value = APIC_DM_EXTINT | APIC_LVT_MASKED;
1081 apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n",
1082 smp_processor_id());
1084 apic_write(APIC_LVT0, value);
1087 * only the BP should see the LINT1 NMI signal, obviously.
1089 if (!smp_processor_id())
1090 value = APIC_DM_NMI;
1092 value = APIC_DM_NMI | APIC_LVT_MASKED;
1093 if (!integrated) /* 82489DX */
1094 value |= APIC_LVT_LEVEL_TRIGGER;
1095 apic_write(APIC_LVT1, value);
1098 void __cpuinit end_local_APIC_setup(void)
1100 unsigned long value;
1103 /* Disable the local apic timer */
1104 value = apic_read(APIC_LVTT);
1105 value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
1106 apic_write(APIC_LVTT, value);
1108 setup_apic_nmi_watchdog(NULL);
1113 * Detect and initialize APIC
1115 static int __init detect_init_APIC(void)
1119 /* Disabled by kernel option? */
1123 switch (boot_cpu_data.x86_vendor) {
1124 case X86_VENDOR_AMD:
1125 if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) ||
1126 (boot_cpu_data.x86 == 15))
1129 case X86_VENDOR_INTEL:
1130 if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 ||
1131 (boot_cpu_data.x86 == 5 && cpu_has_apic))
1138 if (!cpu_has_apic) {
1140 * Over-ride BIOS and try to enable the local APIC only if
1141 * "lapic" specified.
1143 if (!force_enable_local_apic) {
1144 printk(KERN_INFO "Local APIC disabled by BIOS -- "
1145 "you can enable it with \"lapic\"\n");
1149 * Some BIOSes disable the local APIC in the APIC_BASE
1150 * MSR. This can only be done in software for Intel P6 or later
1151 * and AMD K7 (Model > 1) or later.
1153 rdmsr(MSR_IA32_APICBASE, l, h);
1154 if (!(l & MSR_IA32_APICBASE_ENABLE)) {
1156 "Local APIC disabled by BIOS -- reenabling.\n");
1157 l &= ~MSR_IA32_APICBASE_BASE;
1158 l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE;
1159 wrmsr(MSR_IA32_APICBASE, l, h);
1160 enabled_via_apicbase = 1;
1164 * The APIC feature bit should now be enabled
1167 features = cpuid_edx(1);
1168 if (!(features & (1 << X86_FEATURE_APIC))) {
1169 printk(KERN_WARNING "Could not enable APIC!\n");
1172 set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
1173 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
1175 /* The BIOS may have set up the APIC at some other address */
1176 rdmsr(MSR_IA32_APICBASE, l, h);
1177 if (l & MSR_IA32_APICBASE_ENABLE)
1178 mp_lapic_addr = l & MSR_IA32_APICBASE_BASE;
1180 printk(KERN_INFO "Found and enabled local APIC!\n");
1187 printk(KERN_INFO "No local APIC present or hardware disabled\n");
1192 * init_apic_mappings - initialize APIC mappings
1194 void __init init_apic_mappings(void)
1197 * If no local APIC can be found then set up a fake all
1198 * zeroes page to simulate the local APIC and another
1199 * one for the IO-APIC.
1201 if (!smp_found_config && detect_init_APIC()) {
1202 apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
1203 apic_phys = __pa(apic_phys);
1205 apic_phys = mp_lapic_addr;
1207 set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
1208 printk(KERN_DEBUG "mapped APIC to %08lx (%08lx)\n", APIC_BASE,
1212 * Fetch the APIC ID of the BSP in case we have a
1213 * default configuration (or the MP table is broken).
1215 if (boot_cpu_physical_apicid == -1U)
1216 boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
1221 * This initializes the IO-APIC and APIC hardware if this is
1225 int apic_version[MAX_APICS];
1227 int __init APIC_init_uniprocessor(void)
1229 if (!smp_found_config && !cpu_has_apic)
1233 * Complain if the BIOS pretends there is one.
1235 if (!cpu_has_apic &&
1236 APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
1237 printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
1238 boot_cpu_physical_apicid);
1239 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
1243 verify_local_APIC();
1248 * Hack: In case of kdump, after a crash, kernel might be booting
1249 * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid
1250 * might be zero if read from MP tables. Get it from LAPIC.
1252 #ifdef CONFIG_CRASH_DUMP
1253 boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
1255 physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
1259 #ifdef CONFIG_X86_IO_APIC
1260 if (!smp_found_config || skip_ioapic_setup || !nr_ioapics)
1262 localise_nmi_watchdog();
1263 end_local_APIC_setup();
1264 #ifdef CONFIG_X86_IO_APIC
1265 if (smp_found_config)
1266 if (!skip_ioapic_setup && nr_ioapics)
1275 * Local APIC interrupts
1279 * This interrupt should _never_ happen with our APIC/SMP architecture
1281 void smp_spurious_interrupt(struct pt_regs *regs)
1287 * Check if this really is a spurious interrupt and ACK it
1288 * if it is a vectored one. Just in case...
1289 * Spurious interrupts should not be ACKed.
1291 v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1));
1292 if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f)))
1295 /* see sw-dev-man vol 3, chapter 7.4.13.5 */
1296 printk(KERN_INFO "spurious APIC interrupt on CPU#%d, "
1297 "should never happen.\n", smp_processor_id());
1298 __get_cpu_var(irq_stat).irq_spurious_count++;
1303 * This interrupt should never happen with our APIC/SMP architecture
1305 void smp_error_interrupt(struct pt_regs *regs)
1307 unsigned long v, v1;
1310 /* First tickle the hardware, only then report what went on. -- REW */
1311 v = apic_read(APIC_ESR);
1312 apic_write(APIC_ESR, 0);
1313 v1 = apic_read(APIC_ESR);
1315 atomic_inc(&irq_err_count);
1317 /* Here is what the APIC error bits mean:
1320 2: Send accept error
1321 3: Receive accept error
1323 5: Send illegal vector
1324 6: Received illegal vector
1325 7: Illegal register address
1327 printk(KERN_DEBUG "APIC error on CPU%d: %02lx(%02lx)\n",
1328 smp_processor_id(), v , v1);
1333 void __init smp_intr_init(void)
1336 * IRQ0 must be given a fixed assignment and initialized,
1337 * because it's used before the IO-APIC is set up.
1339 set_intr_gate(FIRST_DEVICE_VECTOR, interrupt[0]);
1342 * The reschedule interrupt is a CPU-to-CPU reschedule-helper
1343 * IPI, driven by wakeup.
1345 alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
1347 /* IPI for invalidation */
1348 alloc_intr_gate(INVALIDATE_TLB_VECTOR, invalidate_interrupt);
1350 /* IPI for generic function call */
1351 alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
1353 /* IPI for single call function */
1354 set_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
1355 call_function_single_interrupt);
1360 * Initialize APIC interrupts
1362 void __init apic_intr_init(void)
1367 /* self generated IPI for local APIC timer */
1368 alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
1370 /* IPI vectors for APIC spurious and error interrupts */
1371 alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
1372 alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
1374 /* thermal monitor LVT interrupt */
1375 #ifdef CONFIG_X86_MCE_P4THERMAL
1376 alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
1381 * connect_bsp_APIC - attach the APIC to the interrupt system
1383 void __init connect_bsp_APIC(void)
1387 * Do not trust the local APIC being empty at bootup.
1391 * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's
1392 * local APIC to INT and NMI lines.
1394 apic_printk(APIC_VERBOSE, "leaving PIC mode, "
1395 "enabling APIC mode.\n");
1403 * disconnect_bsp_APIC - detach the APIC from the interrupt system
1404 * @virt_wire_setup: indicates, whether virtual wire mode is selected
1406 * Virtual wire mode is necessary to deliver legacy interrupts even when the
1409 void disconnect_bsp_APIC(int virt_wire_setup)
1413 * Put the board back into PIC mode (has an effect only on
1414 * certain older boards). Note that APIC interrupts, including
1415 * IPIs, won't work beyond this point! The only exception are
1418 apic_printk(APIC_VERBOSE, "disabling APIC mode, "
1419 "entering PIC mode.\n");
1423 /* Go back to Virtual Wire compatibility mode */
1424 unsigned long value;
1426 /* For the spurious interrupt use vector F, and enable it */
1427 value = apic_read(APIC_SPIV);
1428 value &= ~APIC_VECTOR_MASK;
1429 value |= APIC_SPIV_APIC_ENABLED;
1431 apic_write(APIC_SPIV, value);
1433 if (!virt_wire_setup) {
1435 * For LVT0 make it edge triggered, active high,
1436 * external and enabled
1438 value = apic_read(APIC_LVT0);
1439 value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
1440 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
1441 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
1442 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
1443 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
1444 apic_write(APIC_LVT0, value);
1447 apic_write(APIC_LVT0, APIC_LVT_MASKED);
1451 * For LVT1 make it edge triggered, active high, nmi and
1454 value = apic_read(APIC_LVT1);
1456 APIC_MODE_MASK | APIC_SEND_PENDING |
1457 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
1458 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
1459 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
1460 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
1461 apic_write(APIC_LVT1, value);
1465 unsigned int __cpuinitdata maxcpus = NR_CPUS;
1467 void __cpuinit generic_processor_info(int apicid, int version)
1471 physid_mask_t phys_cpu;
1476 if (version == 0x0) {
1477 printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
1478 "fixing up to 0x10. (tell your hw vendor)\n",
1482 apic_version[apicid] = version;
1484 phys_cpu = apicid_to_cpu_present(apicid);
1485 physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
1487 if (num_processors >= NR_CPUS) {
1488 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
1489 " Processor ignored.\n", NR_CPUS);
1493 if (num_processors >= maxcpus) {
1494 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
1495 " Processor ignored.\n", maxcpus);
1500 cpus_complement(tmp_map, cpu_present_map);
1501 cpu = first_cpu(tmp_map);
1503 if (apicid == boot_cpu_physical_apicid)
1505 * x86_bios_cpu_apicid is required to have processors listed
1506 * in same order as logical cpu numbers. Hence the first
1507 * entry is BSP, and so on.
1511 if (apicid > max_physical_apicid)
1512 max_physical_apicid = apicid;
1515 * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
1516 * but we need to work other dependencies like SMP_SUSPEND etc
1517 * before this can be done without some confusion.
1518 * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
1519 * - Ashok Raj <ashok.raj@intel.com>
1521 if (max_physical_apicid >= 8) {
1522 switch (boot_cpu_data.x86_vendor) {
1523 case X86_VENDOR_INTEL:
1524 if (!APIC_XAPIC(version)) {
1528 /* If P4 and above fall through */
1529 case X86_VENDOR_AMD:
1534 /* are we being called early in kernel startup? */
1535 if (early_per_cpu_ptr(x86_cpu_to_apicid)) {
1536 u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
1537 u16 *bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid);
1539 cpu_to_apicid[cpu] = apicid;
1540 bios_cpu_apicid[cpu] = apicid;
1542 per_cpu(x86_cpu_to_apicid, cpu) = apicid;
1543 per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
1546 cpu_set(cpu, cpu_possible_map);
1547 cpu_set(cpu, cpu_present_map);
1557 /* r/w apic fields */
1558 unsigned int apic_id;
1559 unsigned int apic_taskpri;
1560 unsigned int apic_ldr;
1561 unsigned int apic_dfr;
1562 unsigned int apic_spiv;
1563 unsigned int apic_lvtt;
1564 unsigned int apic_lvtpc;
1565 unsigned int apic_lvt0;
1566 unsigned int apic_lvt1;
1567 unsigned int apic_lvterr;
1568 unsigned int apic_tmict;
1569 unsigned int apic_tdcr;
1570 unsigned int apic_thmr;
1573 static int lapic_suspend(struct sys_device *dev, pm_message_t state)
1575 unsigned long flags;
1578 if (!apic_pm_state.active)
1581 maxlvt = lapic_get_maxlvt();
1583 apic_pm_state.apic_id = apic_read(APIC_ID);
1584 apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI);
1585 apic_pm_state.apic_ldr = apic_read(APIC_LDR);
1586 apic_pm_state.apic_dfr = apic_read(APIC_DFR);
1587 apic_pm_state.apic_spiv = apic_read(APIC_SPIV);
1588 apic_pm_state.apic_lvtt = apic_read(APIC_LVTT);
1590 apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC);
1591 apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0);
1592 apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1);
1593 apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR);
1594 apic_pm_state.apic_tmict = apic_read(APIC_TMICT);
1595 apic_pm_state.apic_tdcr = apic_read(APIC_TDCR);
1596 #ifdef CONFIG_X86_MCE_P4THERMAL
1598 apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR);
1601 local_irq_save(flags);
1602 disable_local_APIC();
1603 local_irq_restore(flags);
1607 static int lapic_resume(struct sys_device *dev)
1610 unsigned long flags;
1613 if (!apic_pm_state.active)
1616 maxlvt = lapic_get_maxlvt();
1618 local_irq_save(flags);
1621 * Make sure the APICBASE points to the right address
1623 * FIXME! This will be wrong if we ever support suspend on
1624 * SMP! We'll need to do this as part of the CPU restore!
1626 rdmsr(MSR_IA32_APICBASE, l, h);
1627 l &= ~MSR_IA32_APICBASE_BASE;
1628 l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
1629 wrmsr(MSR_IA32_APICBASE, l, h);
1631 apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED);
1632 apic_write(APIC_ID, apic_pm_state.apic_id);
1633 apic_write(APIC_DFR, apic_pm_state.apic_dfr);
1634 apic_write(APIC_LDR, apic_pm_state.apic_ldr);
1635 apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri);
1636 apic_write(APIC_SPIV, apic_pm_state.apic_spiv);
1637 apic_write(APIC_LVT0, apic_pm_state.apic_lvt0);
1638 apic_write(APIC_LVT1, apic_pm_state.apic_lvt1);
1639 #ifdef CONFIG_X86_MCE_P4THERMAL
1641 apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr);
1644 apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc);
1645 apic_write(APIC_LVTT, apic_pm_state.apic_lvtt);
1646 apic_write(APIC_TDCR, apic_pm_state.apic_tdcr);
1647 apic_write(APIC_TMICT, apic_pm_state.apic_tmict);
1648 apic_write(APIC_ESR, 0);
1649 apic_read(APIC_ESR);
1650 apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr);
1651 apic_write(APIC_ESR, 0);
1652 apic_read(APIC_ESR);
1653 local_irq_restore(flags);
1658 * This device has no shutdown method - fully functioning local APICs
1659 * are needed on every CPU up until machine_halt/restart/poweroff.
1662 static struct sysdev_class lapic_sysclass = {
1664 .resume = lapic_resume,
1665 .suspend = lapic_suspend,
1668 static struct sys_device device_lapic = {
1670 .cls = &lapic_sysclass,
1673 static void __devinit apic_pm_activate(void)
1675 apic_pm_state.active = 1;
1678 static int __init init_lapic_sysfs(void)
1684 /* XXX: remove suspend/resume procs if !apic_pm_state.active? */
1686 error = sysdev_class_register(&lapic_sysclass);
1688 error = sysdev_register(&device_lapic);
1691 device_initcall(init_lapic_sysfs);
1693 #else /* CONFIG_PM */
1695 static void apic_pm_activate(void) { }
1697 #endif /* CONFIG_PM */
1700 * APIC command line parameters
1702 static int __init parse_lapic(char *arg)
1704 force_enable_local_apic = 1;
1707 early_param("lapic", parse_lapic);
1709 static int __init parse_nolapic(char *arg)
1712 setup_clear_cpu_cap(X86_FEATURE_APIC);
1715 early_param("nolapic", parse_nolapic);
1717 static int __init parse_disable_lapic_timer(char *arg)
1719 local_apic_timer_disabled = 1;
1722 early_param("nolapic_timer", parse_disable_lapic_timer);
1724 static int __init parse_lapic_timer_c2_ok(char *arg)
1726 local_apic_timer_c2_ok = 1;
1729 early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
1731 static int __init apic_set_verbosity(char *str)
1733 if (strcmp("debug", str) == 0)
1734 apic_verbosity = APIC_DEBUG;
1735 else if (strcmp("verbose", str) == 0)
1736 apic_verbosity = APIC_VERBOSE;
1739 __setup("apic=", apic_set_verbosity);
1741 static int __init lapic_insert_resource(void)
1746 /* Put local APIC into the resource map. */
1747 lapic_resource.start = apic_phys;
1748 lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1;
1749 insert_resource(&iomem_resource, &lapic_resource);
1755 * need call insert after e820_reserve_resources()
1756 * that is using request_resource
1758 late_initcall(lapic_insert_resource);