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;
55 DEFINE_PER_CPU(u16, x86_bios_cpu_apicid) = BAD_APICID;
56 EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
59 * Knob to control our willingness to enable the local APIC.
61 * -1=force-disable, +1=force-enable
63 static int enable_local_apic __initdata;
65 /* Local APIC timer verification ok */
66 static int local_apic_timer_verify_ok;
67 /* Disable local APIC timer from the kernel commandline or via dmi quirk */
68 static int local_apic_timer_disabled;
69 /* Local APIC timer works in C2 */
70 int local_apic_timer_c2_ok;
71 EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
73 int first_system_vector = 0xfe;
75 char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
78 * Debug level, exported for io_apic.c
82 static unsigned int calibration_result;
84 static int lapic_next_event(unsigned long delta,
85 struct clock_event_device *evt);
86 static void lapic_timer_setup(enum clock_event_mode mode,
87 struct clock_event_device *evt);
88 static void lapic_timer_broadcast(cpumask_t mask);
89 static void apic_pm_activate(void);
92 * The local apic timer can be used for any function which is CPU local.
94 static struct clock_event_device lapic_clockevent = {
96 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT
97 | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY,
99 .set_mode = lapic_timer_setup,
100 .set_next_event = lapic_next_event,
101 .broadcast = lapic_timer_broadcast,
105 static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
107 /* Local APIC was disabled by the BIOS and enabled by the kernel */
108 static int enabled_via_apicbase;
110 static unsigned long apic_phys;
113 * Get the LAPIC version
115 static inline int lapic_get_version(void)
117 return GET_APIC_VERSION(apic_read(APIC_LVR));
121 * Check, if the APIC is integrated or a separate chip
123 static inline int lapic_is_integrated(void)
125 return APIC_INTEGRATED(lapic_get_version());
129 * Check, whether this is a modern or a first generation APIC
131 static int modern_apic(void)
133 /* AMD systems use old APIC versions, so check the CPU */
134 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
135 boot_cpu_data.x86 >= 0xf)
137 return lapic_get_version() >= 0x14;
140 void apic_wait_icr_idle(void)
142 while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
146 u32 safe_apic_wait_icr_idle(void)
153 send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
157 } while (timeout++ < 1000);
163 * enable_NMI_through_LVT0 - enable NMI through local vector table 0
165 void __cpuinit enable_NMI_through_LVT0(void)
167 unsigned int v = APIC_DM_NMI;
169 /* Level triggered for 82489DX */
170 if (!lapic_is_integrated())
171 v |= APIC_LVT_LEVEL_TRIGGER;
172 apic_write_around(APIC_LVT0, v);
176 * get_physical_broadcast - Get number of physical broadcast IDs
178 int get_physical_broadcast(void)
180 return modern_apic() ? 0xff : 0xf;
184 * lapic_get_maxlvt - get the maximum number of local vector table entries
186 int lapic_get_maxlvt(void)
188 unsigned int v = apic_read(APIC_LVR);
190 /* 82489DXs do not report # of LVT entries. */
191 return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2;
198 /* Clock divisor is set to 16 */
199 #define APIC_DIVISOR 16
202 * This function sets up the local APIC timer, with a timeout of
203 * 'clocks' APIC bus clock. During calibration we actually call
204 * this function twice on the boot CPU, once with a bogus timeout
205 * value, second time for real. The other (noncalibrating) CPUs
206 * call this function only once, with the real, calibrated value.
208 * We do reads before writes even if unnecessary, to get around the
209 * P5 APIC double write bug.
211 static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
213 unsigned int lvtt_value, tmp_value;
215 lvtt_value = LOCAL_TIMER_VECTOR;
217 lvtt_value |= APIC_LVT_TIMER_PERIODIC;
218 if (!lapic_is_integrated())
219 lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV);
222 lvtt_value |= APIC_LVT_MASKED;
224 apic_write_around(APIC_LVTT, lvtt_value);
229 tmp_value = apic_read(APIC_TDCR);
230 apic_write_around(APIC_TDCR, (tmp_value
231 & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE))
235 apic_write_around(APIC_TMICT, clocks/APIC_DIVISOR);
239 * Program the next event, relative to now
241 static int lapic_next_event(unsigned long delta,
242 struct clock_event_device *evt)
244 apic_write_around(APIC_TMICT, delta);
249 * Setup the lapic timer in periodic or oneshot mode
251 static void lapic_timer_setup(enum clock_event_mode mode,
252 struct clock_event_device *evt)
257 /* Lapic used for broadcast ? */
258 if (!local_apic_timer_verify_ok)
261 local_irq_save(flags);
264 case CLOCK_EVT_MODE_PERIODIC:
265 case CLOCK_EVT_MODE_ONESHOT:
266 __setup_APIC_LVTT(calibration_result,
267 mode != CLOCK_EVT_MODE_PERIODIC, 1);
269 case CLOCK_EVT_MODE_UNUSED:
270 case CLOCK_EVT_MODE_SHUTDOWN:
271 v = apic_read(APIC_LVTT);
272 v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
273 apic_write_around(APIC_LVTT, v);
275 case CLOCK_EVT_MODE_RESUME:
276 /* Nothing to do here */
280 local_irq_restore(flags);
284 * Local APIC timer broadcast function
286 static void lapic_timer_broadcast(cpumask_t mask)
289 send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
294 * Setup the local APIC timer for this CPU. Copy the initilized values
295 * of the boot CPU and register the clock event in the framework.
297 static void __devinit setup_APIC_timer(void)
299 struct clock_event_device *levt = &__get_cpu_var(lapic_events);
301 memcpy(levt, &lapic_clockevent, sizeof(*levt));
302 levt->cpumask = cpumask_of_cpu(smp_processor_id());
304 clockevents_register_device(levt);
308 * In this functions we calibrate APIC bus clocks to the external timer.
310 * We want to do the calibration only once since we want to have local timer
311 * irqs syncron. CPUs connected by the same APIC bus have the very same bus
314 * This was previously done by reading the PIT/HPET and waiting for a wrap
315 * around to find out, that a tick has elapsed. I have a box, where the PIT
316 * readout is broken, so it never gets out of the wait loop again. This was
317 * also reported by others.
319 * Monitoring the jiffies value is inaccurate and the clockevents
320 * infrastructure allows us to do a simple substitution of the interrupt
323 * The calibration routine also uses the pm_timer when possible, as the PIT
324 * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes
325 * back to normal later in the boot process).
328 #define LAPIC_CAL_LOOPS (HZ/10)
330 static __initdata int lapic_cal_loops = -1;
331 static __initdata long lapic_cal_t1, lapic_cal_t2;
332 static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2;
333 static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2;
334 static __initdata unsigned long lapic_cal_j1, lapic_cal_j2;
337 * Temporary interrupt handler.
339 static void __init lapic_cal_handler(struct clock_event_device *dev)
341 unsigned long long tsc = 0;
342 long tapic = apic_read(APIC_TMCCT);
343 unsigned long pm = acpi_pm_read_early();
348 switch (lapic_cal_loops++) {
350 lapic_cal_t1 = tapic;
351 lapic_cal_tsc1 = tsc;
353 lapic_cal_j1 = jiffies;
356 case LAPIC_CAL_LOOPS:
357 lapic_cal_t2 = tapic;
358 lapic_cal_tsc2 = tsc;
359 if (pm < lapic_cal_pm1)
360 pm += ACPI_PM_OVRRUN;
362 lapic_cal_j2 = jiffies;
368 * Setup the boot APIC
370 * Calibrate and verify the result.
372 void __init setup_boot_APIC_clock(void)
374 struct clock_event_device *levt = &__get_cpu_var(lapic_events);
375 const long pm_100ms = PMTMR_TICKS_PER_SEC/10;
376 const long pm_thresh = pm_100ms/100;
377 void (*real_handler)(struct clock_event_device *dev);
378 unsigned long deltaj;
380 int pm_referenced = 0;
383 * The local apic timer can be disabled via the kernel
384 * commandline or from the CPU detection code. Register the lapic
385 * timer as a dummy clock event source on SMP systems, so the
386 * broadcast mechanism is used. On UP systems simply ignore it.
388 if (local_apic_timer_disabled) {
389 /* No broadcast on UP ! */
390 if (num_possible_cpus() > 1) {
391 lapic_clockevent.mult = 1;
397 apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n"
398 "calibrating APIC timer ...\n");
402 /* Replace the global interrupt handler */
403 real_handler = global_clock_event->event_handler;
404 global_clock_event->event_handler = lapic_cal_handler;
407 * Setup the APIC counter to 1e9. There is no way the lapic
408 * can underflow in the 100ms detection time frame
410 __setup_APIC_LVTT(1000000000, 0, 0);
412 /* Let the interrupts run */
415 while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
420 /* Restore the real event handler */
421 global_clock_event->event_handler = real_handler;
423 /* Build delta t1-t2 as apic timer counts down */
424 delta = lapic_cal_t1 - lapic_cal_t2;
425 apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta);
427 /* Check, if the PM timer is available */
428 deltapm = lapic_cal_pm2 - lapic_cal_pm1;
429 apic_printk(APIC_VERBOSE, "... PM timer delta = %ld\n", deltapm);
435 mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22);
437 if (deltapm > (pm_100ms - pm_thresh) &&
438 deltapm < (pm_100ms + pm_thresh)) {
439 apic_printk(APIC_VERBOSE, "... PM timer result ok\n");
441 res = (((u64) deltapm) * mult) >> 22;
442 do_div(res, 1000000);
443 printk(KERN_WARNING "APIC calibration not consistent "
444 "with PM Timer: %ldms instead of 100ms\n",
446 /* Correct the lapic counter value */
447 res = (((u64) delta) * pm_100ms);
448 do_div(res, deltapm);
449 printk(KERN_INFO "APIC delta adjusted to PM-Timer: "
450 "%lu (%ld)\n", (unsigned long) res, delta);
456 /* Calculate the scaled math multiplication factor */
457 lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
458 lapic_clockevent.shift);
459 lapic_clockevent.max_delta_ns =
460 clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
461 lapic_clockevent.min_delta_ns =
462 clockevent_delta2ns(0xF, &lapic_clockevent);
464 calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
466 apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
467 apic_printk(APIC_VERBOSE, "..... mult: %ld\n", lapic_clockevent.mult);
468 apic_printk(APIC_VERBOSE, "..... calibration result: %u\n",
472 delta = (long)(lapic_cal_tsc2 - lapic_cal_tsc1);
473 apic_printk(APIC_VERBOSE, "..... CPU clock speed is "
475 (delta / LAPIC_CAL_LOOPS) / (1000000 / HZ),
476 (delta / LAPIC_CAL_LOOPS) % (1000000 / HZ));
479 apic_printk(APIC_VERBOSE, "..... host bus clock speed is "
481 calibration_result / (1000000 / HZ),
482 calibration_result % (1000000 / HZ));
484 local_apic_timer_verify_ok = 1;
487 * Do a sanity check on the APIC calibration result
489 if (calibration_result < (1000000 / HZ)) {
492 "APIC frequency too slow, disabling apic timer\n");
493 /* No broadcast on UP ! */
494 if (num_possible_cpus() > 1)
499 /* We trust the pm timer based calibration */
500 if (!pm_referenced) {
501 apic_printk(APIC_VERBOSE, "... verify APIC timer\n");
504 * Setup the apic timer manually
506 levt->event_handler = lapic_cal_handler;
507 lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt);
508 lapic_cal_loops = -1;
510 /* Let the interrupts run */
513 while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
518 /* Stop the lapic timer */
519 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt);
524 deltaj = lapic_cal_j2 - lapic_cal_j1;
525 apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj);
527 /* Check, if the jiffies result is consistent */
528 if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2)
529 apic_printk(APIC_VERBOSE, "... jiffies result ok\n");
531 local_apic_timer_verify_ok = 0;
535 if (!local_apic_timer_verify_ok) {
537 "APIC timer disabled due to verification failure.\n");
538 /* No broadcast on UP ! */
539 if (num_possible_cpus() == 1)
543 * If nmi_watchdog is set to IO_APIC, we need the
544 * PIT/HPET going. Otherwise register lapic as a dummy
547 if (nmi_watchdog != NMI_IO_APIC)
548 lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
550 printk(KERN_WARNING "APIC timer registered as dummy,"
551 " due to nmi_watchdog=1!\n");
554 /* Setup the lapic or request the broadcast */
558 void __devinit setup_secondary_APIC_clock(void)
564 * The guts of the apic timer interrupt
566 static void local_apic_timer_interrupt(void)
568 int cpu = smp_processor_id();
569 struct clock_event_device *evt = &per_cpu(lapic_events, cpu);
572 * Normally we should not be here till LAPIC has been initialized but
573 * in some cases like kdump, its possible that there is a pending LAPIC
574 * timer interrupt from previous kernel's context and is delivered in
575 * new kernel the moment interrupts are enabled.
577 * Interrupts are enabled early and LAPIC is setup much later, hence
578 * its possible that when we get here evt->event_handler is NULL.
579 * Check for event_handler being NULL and discard the interrupt as
582 if (!evt->event_handler) {
584 "Spurious LAPIC timer interrupt on cpu %d\n", cpu);
586 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt);
591 * the NMI deadlock-detector uses this.
593 per_cpu(irq_stat, cpu).apic_timer_irqs++;
595 evt->event_handler(evt);
599 * Local APIC timer interrupt. This is the most natural way for doing
600 * local interrupts, but local timer interrupts can be emulated by
601 * broadcast interrupts too. [in case the hw doesn't support APIC timers]
603 * [ if a single-CPU system runs an SMP kernel then we call the local
604 * interrupt as well. Thus we cannot inline the local irq ... ]
606 void smp_apic_timer_interrupt(struct pt_regs *regs)
608 struct pt_regs *old_regs = set_irq_regs(regs);
611 * NOTE! We'd better ACK the irq immediately,
612 * because timer handling can be slow.
616 * update_process_times() expects us to have done irq_enter().
617 * Besides, if we don't timer interrupts ignore the global
618 * interrupt lock, which is the WrongThing (tm) to do.
621 local_apic_timer_interrupt();
624 set_irq_regs(old_regs);
627 int setup_profiling_timer(unsigned int multiplier)
633 * Setup extended LVT, AMD specific (K8, family 10h)
635 * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and
636 * MCE interrupts are supported. Thus MCE offset must be set to 0.
639 #define APIC_EILVT_LVTOFF_MCE 0
640 #define APIC_EILVT_LVTOFF_IBS 1
642 static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask)
644 unsigned long reg = (lvt_off << 4) + APIC_EILVT0;
645 unsigned int v = (mask << 16) | (msg_type << 8) | vector;
649 u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask)
651 setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask);
652 return APIC_EILVT_LVTOFF_MCE;
655 u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask)
657 setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask);
658 return APIC_EILVT_LVTOFF_IBS;
662 * Local APIC start and shutdown
666 * clear_local_APIC - shutdown the local APIC
668 * This is called, when a CPU is disabled and before rebooting, so the state of
669 * the local APIC has no dangling leftovers. Also used to cleanout any BIOS
670 * leftovers during boot.
672 void clear_local_APIC(void)
677 /* APIC hasn't been mapped yet */
681 maxlvt = lapic_get_maxlvt();
683 * Masking an LVT entry can trigger a local APIC error
684 * if the vector is zero. Mask LVTERR first to prevent this.
687 v = ERROR_APIC_VECTOR; /* any non-zero vector will do */
688 apic_write_around(APIC_LVTERR, v | APIC_LVT_MASKED);
691 * Careful: we have to set masks only first to deassert
692 * any level-triggered sources.
694 v = apic_read(APIC_LVTT);
695 apic_write_around(APIC_LVTT, v | APIC_LVT_MASKED);
696 v = apic_read(APIC_LVT0);
697 apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED);
698 v = apic_read(APIC_LVT1);
699 apic_write_around(APIC_LVT1, v | APIC_LVT_MASKED);
701 v = apic_read(APIC_LVTPC);
702 apic_write_around(APIC_LVTPC, v | APIC_LVT_MASKED);
705 /* lets not touch this if we didn't frob it */
706 #ifdef CONFIG_X86_MCE_P4THERMAL
708 v = apic_read(APIC_LVTTHMR);
709 apic_write_around(APIC_LVTTHMR, v | APIC_LVT_MASKED);
713 * Clean APIC state for other OSs:
715 apic_write_around(APIC_LVTT, APIC_LVT_MASKED);
716 apic_write_around(APIC_LVT0, APIC_LVT_MASKED);
717 apic_write_around(APIC_LVT1, APIC_LVT_MASKED);
719 apic_write_around(APIC_LVTERR, APIC_LVT_MASKED);
721 apic_write_around(APIC_LVTPC, APIC_LVT_MASKED);
723 #ifdef CONFIG_X86_MCE_P4THERMAL
725 apic_write_around(APIC_LVTTHMR, APIC_LVT_MASKED);
727 /* Integrated APIC (!82489DX) ? */
728 if (lapic_is_integrated()) {
730 /* Clear ESR due to Pentium errata 3AP and 11AP */
731 apic_write(APIC_ESR, 0);
737 * disable_local_APIC - clear and disable the local APIC
739 void disable_local_APIC(void)
746 * Disable APIC (implies clearing of registers
749 value = apic_read(APIC_SPIV);
750 value &= ~APIC_SPIV_APIC_ENABLED;
751 apic_write_around(APIC_SPIV, value);
754 * When LAPIC was disabled by the BIOS and enabled by the kernel,
755 * restore the disabled state.
757 if (enabled_via_apicbase) {
760 rdmsr(MSR_IA32_APICBASE, l, h);
761 l &= ~MSR_IA32_APICBASE_ENABLE;
762 wrmsr(MSR_IA32_APICBASE, l, h);
767 * If Linux enabled the LAPIC against the BIOS default disable it down before
768 * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and
769 * not power-off. Additionally clear all LVT entries before disable_local_APIC
770 * for the case where Linux didn't enable the LAPIC.
772 void lapic_shutdown(void)
779 local_irq_save(flags);
782 if (enabled_via_apicbase)
783 disable_local_APIC();
785 local_irq_restore(flags);
789 * This is to verify that we're looking at a real local APIC.
790 * Check these against your board if the CPUs aren't getting
791 * started for no apparent reason.
793 int __init verify_local_APIC(void)
795 unsigned int reg0, reg1;
798 * The version register is read-only in a real APIC.
800 reg0 = apic_read(APIC_LVR);
801 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0);
802 apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK);
803 reg1 = apic_read(APIC_LVR);
804 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1);
807 * The two version reads above should print the same
808 * numbers. If the second one is different, then we
809 * poke at a non-APIC.
815 * Check if the version looks reasonably.
817 reg1 = GET_APIC_VERSION(reg0);
818 if (reg1 == 0x00 || reg1 == 0xff)
820 reg1 = lapic_get_maxlvt();
821 if (reg1 < 0x02 || reg1 == 0xff)
825 * The ID register is read/write in a real APIC.
827 reg0 = apic_read(APIC_ID);
828 apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
831 * The next two are just to see if we have sane values.
832 * They're only really relevant if we're in Virtual Wire
833 * compatibility mode, but most boxes are anymore.
835 reg0 = apic_read(APIC_LVT0);
836 apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0);
837 reg1 = apic_read(APIC_LVT1);
838 apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1);
844 * sync_Arb_IDs - synchronize APIC bus arbitration IDs
846 void __init sync_Arb_IDs(void)
849 * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
852 if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
857 apic_wait_icr_idle();
859 apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n");
860 apic_write_around(APIC_ICR, APIC_DEST_ALLINC | APIC_INT_LEVELTRIG
865 * An initial setup of the virtual wire mode.
867 void __init init_bsp_APIC(void)
872 * Don't do the setup now if we have a SMP BIOS as the
873 * through-I/O-APIC virtual wire mode might be active.
875 if (smp_found_config || !cpu_has_apic)
879 * Do not trust the local APIC being empty at bootup.
886 value = apic_read(APIC_SPIV);
887 value &= ~APIC_VECTOR_MASK;
888 value |= APIC_SPIV_APIC_ENABLED;
890 /* This bit is reserved on P4/Xeon and should be cleared */
891 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
892 (boot_cpu_data.x86 == 15))
893 value &= ~APIC_SPIV_FOCUS_DISABLED;
895 value |= APIC_SPIV_FOCUS_DISABLED;
896 value |= SPURIOUS_APIC_VECTOR;
897 apic_write_around(APIC_SPIV, value);
900 * Set up the virtual wire mode.
902 apic_write_around(APIC_LVT0, APIC_DM_EXTINT);
904 if (!lapic_is_integrated()) /* 82489DX */
905 value |= APIC_LVT_LEVEL_TRIGGER;
906 apic_write_around(APIC_LVT1, value);
909 static void __cpuinit lapic_setup_esr(void)
911 unsigned long oldvalue, value, maxlvt;
912 if (lapic_is_integrated() && !esr_disable) {
914 maxlvt = lapic_get_maxlvt();
915 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
916 apic_write(APIC_ESR, 0);
917 oldvalue = apic_read(APIC_ESR);
919 /* enables sending errors */
920 value = ERROR_APIC_VECTOR;
921 apic_write_around(APIC_LVTERR, value);
923 * spec says clear errors after enabling vector.
926 apic_write(APIC_ESR, 0);
927 value = apic_read(APIC_ESR);
928 if (value != oldvalue)
929 apic_printk(APIC_VERBOSE, "ESR value before enabling "
930 "vector: 0x%08lx after: 0x%08lx\n",
935 * Something untraceable is creating bad interrupts on
936 * secondary quads ... for the moment, just leave the
937 * ESR disabled - we can't do anything useful with the
938 * errors anyway - mbligh
940 printk(KERN_INFO "Leaving ESR disabled.\n");
942 printk(KERN_INFO "No ESR for 82489DX.\n");
948 * setup_local_APIC - setup the local APIC
950 void __cpuinit setup_local_APIC(void)
952 unsigned long value, integrated;
955 /* Pound the ESR really hard over the head with a big hammer - mbligh */
957 apic_write(APIC_ESR, 0);
958 apic_write(APIC_ESR, 0);
959 apic_write(APIC_ESR, 0);
960 apic_write(APIC_ESR, 0);
963 integrated = lapic_is_integrated();
966 * Double-check whether this APIC is really registered.
968 if (!apic_id_registered())
972 * Intel recommends to set DFR, LDR and TPR before enabling
973 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
974 * document number 292116). So here it goes...
979 * Set Task Priority to 'accept all'. We never change this
982 value = apic_read(APIC_TASKPRI);
983 value &= ~APIC_TPRI_MASK;
984 apic_write_around(APIC_TASKPRI, value);
987 * After a crash, we no longer service the interrupts and a pending
988 * interrupt from previous kernel might still have ISR bit set.
990 * Most probably by now CPU has serviced that pending interrupt and
991 * it might not have done the ack_APIC_irq() because it thought,
992 * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it
993 * does not clear the ISR bit and cpu thinks it has already serivced
994 * the interrupt. Hence a vector might get locked. It was noticed
995 * for timer irq (vector 0x31). Issue an extra EOI to clear ISR.
997 for (i = APIC_ISR_NR - 1; i >= 0; i--) {
998 value = apic_read(APIC_ISR + i*0x10);
999 for (j = 31; j >= 0; j--) {
1006 * Now that we are all set up, enable the APIC
1008 value = apic_read(APIC_SPIV);
1009 value &= ~APIC_VECTOR_MASK;
1013 value |= APIC_SPIV_APIC_ENABLED;
1016 * Some unknown Intel IO/APIC (or APIC) errata is biting us with
1017 * certain networking cards. If high frequency interrupts are
1018 * happening on a particular IOAPIC pin, plus the IOAPIC routing
1019 * entry is masked/unmasked at a high rate as well then sooner or
1020 * later IOAPIC line gets 'stuck', no more interrupts are received
1021 * from the device. If focus CPU is disabled then the hang goes
1024 * [ This bug can be reproduced easily with a level-triggered
1025 * PCI Ne2000 networking cards and PII/PIII processors, dual
1029 * Actually disabling the focus CPU check just makes the hang less
1030 * frequent as it makes the interrupt distributon model be more
1031 * like LRU than MRU (the short-term load is more even across CPUs).
1032 * See also the comment in end_level_ioapic_irq(). --macro
1035 /* Enable focus processor (bit==0) */
1036 value &= ~APIC_SPIV_FOCUS_DISABLED;
1039 * Set spurious IRQ vector
1041 value |= SPURIOUS_APIC_VECTOR;
1042 apic_write_around(APIC_SPIV, value);
1045 * Set up LVT0, LVT1:
1047 * set up through-local-APIC on the BP's LINT0. This is not
1048 * strictly necessary in pure symmetric-IO mode, but sometimes
1049 * we delegate interrupts to the 8259A.
1052 * TODO: set up through-local-APIC from through-I/O-APIC? --macro
1054 value = apic_read(APIC_LVT0) & APIC_LVT_MASKED;
1055 if (!smp_processor_id() && (pic_mode || !value)) {
1056 value = APIC_DM_EXTINT;
1057 apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n",
1058 smp_processor_id());
1060 value = APIC_DM_EXTINT | APIC_LVT_MASKED;
1061 apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n",
1062 smp_processor_id());
1064 apic_write_around(APIC_LVT0, value);
1067 * only the BP should see the LINT1 NMI signal, obviously.
1069 if (!smp_processor_id())
1070 value = APIC_DM_NMI;
1072 value = APIC_DM_NMI | APIC_LVT_MASKED;
1073 if (!integrated) /* 82489DX */
1074 value |= APIC_LVT_LEVEL_TRIGGER;
1075 apic_write_around(APIC_LVT1, value);
1078 void __cpuinit end_local_APIC_setup(void)
1080 unsigned long value;
1083 /* Disable the local apic timer */
1084 value = apic_read(APIC_LVTT);
1085 value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
1086 apic_write_around(APIC_LVTT, value);
1088 setup_apic_nmi_watchdog(NULL);
1093 * Detect and initialize APIC
1095 static int __init detect_init_APIC(void)
1099 /* Disabled by kernel option? */
1100 if (enable_local_apic < 0)
1103 switch (boot_cpu_data.x86_vendor) {
1104 case X86_VENDOR_AMD:
1105 if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) ||
1106 (boot_cpu_data.x86 == 15))
1109 case X86_VENDOR_INTEL:
1110 if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 ||
1111 (boot_cpu_data.x86 == 5 && cpu_has_apic))
1118 if (!cpu_has_apic) {
1120 * Over-ride BIOS and try to enable the local APIC only if
1121 * "lapic" specified.
1123 if (enable_local_apic <= 0) {
1124 printk(KERN_INFO "Local APIC disabled by BIOS -- "
1125 "you can enable it with \"lapic\"\n");
1129 * Some BIOSes disable the local APIC in the APIC_BASE
1130 * MSR. This can only be done in software for Intel P6 or later
1131 * and AMD K7 (Model > 1) or later.
1133 rdmsr(MSR_IA32_APICBASE, l, h);
1134 if (!(l & MSR_IA32_APICBASE_ENABLE)) {
1136 "Local APIC disabled by BIOS -- reenabling.\n");
1137 l &= ~MSR_IA32_APICBASE_BASE;
1138 l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE;
1139 wrmsr(MSR_IA32_APICBASE, l, h);
1140 enabled_via_apicbase = 1;
1144 * The APIC feature bit should now be enabled
1147 features = cpuid_edx(1);
1148 if (!(features & (1 << X86_FEATURE_APIC))) {
1149 printk(KERN_WARNING "Could not enable APIC!\n");
1152 set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
1153 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
1155 /* The BIOS may have set up the APIC at some other address */
1156 rdmsr(MSR_IA32_APICBASE, l, h);
1157 if (l & MSR_IA32_APICBASE_ENABLE)
1158 mp_lapic_addr = l & MSR_IA32_APICBASE_BASE;
1160 printk(KERN_INFO "Found and enabled local APIC!\n");
1167 printk(KERN_INFO "No local APIC present or hardware disabled\n");
1172 * init_apic_mappings - initialize APIC mappings
1174 void __init init_apic_mappings(void)
1177 * If no local APIC can be found then set up a fake all
1178 * zeroes page to simulate the local APIC and another
1179 * one for the IO-APIC.
1181 if (!smp_found_config && detect_init_APIC()) {
1182 apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
1183 apic_phys = __pa(apic_phys);
1185 apic_phys = mp_lapic_addr;
1187 set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
1188 printk(KERN_DEBUG "mapped APIC to %08lx (%08lx)\n", APIC_BASE,
1192 * Fetch the APIC ID of the BSP in case we have a
1193 * default configuration (or the MP table is broken).
1195 if (boot_cpu_physical_apicid == -1U)
1196 boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
1198 #ifdef CONFIG_X86_IO_APIC
1200 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
1203 for (i = 0; i < nr_ioapics; i++) {
1204 if (smp_found_config) {
1205 ioapic_phys = mp_ioapics[i].mpc_apicaddr;
1208 "WARNING: bogus zero IO-APIC "
1209 "address found in MPTABLE, "
1210 "disabling IO/APIC support!\n");
1211 smp_found_config = 0;
1212 skip_ioapic_setup = 1;
1213 goto fake_ioapic_page;
1217 ioapic_phys = (unsigned long)
1218 alloc_bootmem_pages(PAGE_SIZE);
1219 ioapic_phys = __pa(ioapic_phys);
1221 set_fixmap_nocache(idx, ioapic_phys);
1222 printk(KERN_DEBUG "mapped IOAPIC to %08lx (%08lx)\n",
1223 __fix_to_virt(idx), ioapic_phys);
1231 * This initializes the IO-APIC and APIC hardware if this is
1235 int apic_version[MAX_APICS];
1237 int __init APIC_init_uniprocessor(void)
1239 if (enable_local_apic < 0)
1240 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
1242 if (!smp_found_config && !cpu_has_apic)
1246 * Complain if the BIOS pretends there is one.
1248 if (!cpu_has_apic &&
1249 APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
1250 printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
1251 boot_cpu_physical_apicid);
1252 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
1256 verify_local_APIC();
1261 * Hack: In case of kdump, after a crash, kernel might be booting
1262 * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid
1263 * might be zero if read from MP tables. Get it from LAPIC.
1265 #ifdef CONFIG_CRASH_DUMP
1266 boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
1268 phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
1272 #ifdef CONFIG_X86_IO_APIC
1273 if (!smp_found_config || skip_ioapic_setup || !nr_ioapics)
1275 localise_nmi_watchdog();
1276 end_local_APIC_setup();
1277 #ifdef CONFIG_X86_IO_APIC
1278 if (smp_found_config)
1279 if (!skip_ioapic_setup && nr_ioapics)
1288 * Local APIC interrupts
1292 * This interrupt should _never_ happen with our APIC/SMP architecture
1294 void smp_spurious_interrupt(struct pt_regs *regs)
1300 * Check if this really is a spurious interrupt and ACK it
1301 * if it is a vectored one. Just in case...
1302 * Spurious interrupts should not be ACKed.
1304 v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1));
1305 if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f)))
1308 /* see sw-dev-man vol 3, chapter 7.4.13.5 */
1309 printk(KERN_INFO "spurious APIC interrupt on CPU#%d, "
1310 "should never happen.\n", smp_processor_id());
1311 __get_cpu_var(irq_stat).irq_spurious_count++;
1316 * This interrupt should never happen with our APIC/SMP architecture
1318 void smp_error_interrupt(struct pt_regs *regs)
1320 unsigned long v, v1;
1323 /* First tickle the hardware, only then report what went on. -- REW */
1324 v = apic_read(APIC_ESR);
1325 apic_write(APIC_ESR, 0);
1326 v1 = apic_read(APIC_ESR);
1328 atomic_inc(&irq_err_count);
1330 /* Here is what the APIC error bits mean:
1333 2: Send accept error
1334 3: Receive accept error
1336 5: Send illegal vector
1337 6: Received illegal vector
1338 7: Illegal register address
1340 printk(KERN_DEBUG "APIC error on CPU%d: %02lx(%02lx)\n",
1341 smp_processor_id(), v , v1);
1346 void __init smp_intr_init(void)
1349 * IRQ0 must be given a fixed assignment and initialized,
1350 * because it's used before the IO-APIC is set up.
1352 set_intr_gate(FIRST_DEVICE_VECTOR, interrupt[0]);
1355 * The reschedule interrupt is a CPU-to-CPU reschedule-helper
1356 * IPI, driven by wakeup.
1358 alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
1360 /* IPI for invalidation */
1361 alloc_intr_gate(INVALIDATE_TLB_VECTOR, invalidate_interrupt);
1363 /* IPI for generic function call */
1364 alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
1369 * Initialize APIC interrupts
1371 void __init apic_intr_init(void)
1376 /* self generated IPI for local APIC timer */
1377 alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
1379 /* IPI vectors for APIC spurious and error interrupts */
1380 alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
1381 alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
1383 /* thermal monitor LVT interrupt */
1384 #ifdef CONFIG_X86_MCE_P4THERMAL
1385 alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
1390 * connect_bsp_APIC - attach the APIC to the interrupt system
1392 void __init connect_bsp_APIC(void)
1396 * Do not trust the local APIC being empty at bootup.
1400 * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's
1401 * local APIC to INT and NMI lines.
1403 apic_printk(APIC_VERBOSE, "leaving PIC mode, "
1404 "enabling APIC mode.\n");
1412 * disconnect_bsp_APIC - detach the APIC from the interrupt system
1413 * @virt_wire_setup: indicates, whether virtual wire mode is selected
1415 * Virtual wire mode is necessary to deliver legacy interrupts even when the
1418 void disconnect_bsp_APIC(int virt_wire_setup)
1422 * Put the board back into PIC mode (has an effect only on
1423 * certain older boards). Note that APIC interrupts, including
1424 * IPIs, won't work beyond this point! The only exception are
1427 apic_printk(APIC_VERBOSE, "disabling APIC mode, "
1428 "entering PIC mode.\n");
1432 /* Go back to Virtual Wire compatibility mode */
1433 unsigned long value;
1435 /* For the spurious interrupt use vector F, and enable it */
1436 value = apic_read(APIC_SPIV);
1437 value &= ~APIC_VECTOR_MASK;
1438 value |= APIC_SPIV_APIC_ENABLED;
1440 apic_write_around(APIC_SPIV, value);
1442 if (!virt_wire_setup) {
1444 * For LVT0 make it edge triggered, active high,
1445 * external and enabled
1447 value = apic_read(APIC_LVT0);
1448 value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
1449 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
1450 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
1451 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
1452 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
1453 apic_write_around(APIC_LVT0, value);
1456 apic_write_around(APIC_LVT0, APIC_LVT_MASKED);
1460 * For LVT1 make it edge triggered, active high, nmi and
1463 value = apic_read(APIC_LVT1);
1465 APIC_MODE_MASK | APIC_SEND_PENDING |
1466 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
1467 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
1468 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
1469 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
1470 apic_write_around(APIC_LVT1, value);
1474 unsigned int __cpuinitdata maxcpus = NR_CPUS;
1476 void __cpuinit generic_processor_info(int apicid, int version)
1480 physid_mask_t phys_cpu;
1485 if (version == 0x0) {
1486 printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
1487 "fixing up to 0x10. (tell your hw vendor)\n",
1491 apic_version[apicid] = version;
1493 phys_cpu = apicid_to_cpu_present(apicid);
1494 physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
1496 if (num_processors >= NR_CPUS) {
1497 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
1498 " Processor ignored.\n", NR_CPUS);
1502 if (num_processors >= maxcpus) {
1503 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
1504 " Processor ignored.\n", maxcpus);
1509 cpus_complement(tmp_map, cpu_present_map);
1510 cpu = first_cpu(tmp_map);
1512 if (apicid == boot_cpu_physical_apicid)
1514 * x86_bios_cpu_apicid is required to have processors listed
1515 * in same order as logical cpu numbers. Hence the first
1516 * entry is BSP, and so on.
1521 * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
1522 * but we need to work other dependencies like SMP_SUSPEND etc
1523 * before this can be done without some confusion.
1524 * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
1525 * - Ashok Raj <ashok.raj@intel.com>
1527 if (num_processors > 8) {
1528 switch (boot_cpu_data.x86_vendor) {
1529 case X86_VENDOR_INTEL:
1530 if (!APIC_XAPIC(version)) {
1534 /* If P4 and above fall through */
1535 case X86_VENDOR_AMD:
1540 /* are we being called early in kernel startup? */
1541 if (x86_cpu_to_apicid_early_ptr) {
1542 u16 *cpu_to_apicid = x86_cpu_to_apicid_early_ptr;
1543 u16 *bios_cpu_apicid = x86_bios_cpu_apicid_early_ptr;
1545 cpu_to_apicid[cpu] = apicid;
1546 bios_cpu_apicid[cpu] = apicid;
1548 per_cpu(x86_cpu_to_apicid, cpu) = apicid;
1549 per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
1552 cpu_set(cpu, cpu_possible_map);
1553 cpu_set(cpu, cpu_present_map);
1563 /* r/w apic fields */
1564 unsigned int apic_id;
1565 unsigned int apic_taskpri;
1566 unsigned int apic_ldr;
1567 unsigned int apic_dfr;
1568 unsigned int apic_spiv;
1569 unsigned int apic_lvtt;
1570 unsigned int apic_lvtpc;
1571 unsigned int apic_lvt0;
1572 unsigned int apic_lvt1;
1573 unsigned int apic_lvterr;
1574 unsigned int apic_tmict;
1575 unsigned int apic_tdcr;
1576 unsigned int apic_thmr;
1579 static int lapic_suspend(struct sys_device *dev, pm_message_t state)
1581 unsigned long flags;
1584 if (!apic_pm_state.active)
1587 maxlvt = lapic_get_maxlvt();
1589 apic_pm_state.apic_id = apic_read(APIC_ID);
1590 apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI);
1591 apic_pm_state.apic_ldr = apic_read(APIC_LDR);
1592 apic_pm_state.apic_dfr = apic_read(APIC_DFR);
1593 apic_pm_state.apic_spiv = apic_read(APIC_SPIV);
1594 apic_pm_state.apic_lvtt = apic_read(APIC_LVTT);
1596 apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC);
1597 apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0);
1598 apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1);
1599 apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR);
1600 apic_pm_state.apic_tmict = apic_read(APIC_TMICT);
1601 apic_pm_state.apic_tdcr = apic_read(APIC_TDCR);
1602 #ifdef CONFIG_X86_MCE_P4THERMAL
1604 apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR);
1607 local_irq_save(flags);
1608 disable_local_APIC();
1609 local_irq_restore(flags);
1613 static int lapic_resume(struct sys_device *dev)
1616 unsigned long flags;
1619 if (!apic_pm_state.active)
1622 maxlvt = lapic_get_maxlvt();
1624 local_irq_save(flags);
1627 * Make sure the APICBASE points to the right address
1629 * FIXME! This will be wrong if we ever support suspend on
1630 * SMP! We'll need to do this as part of the CPU restore!
1632 rdmsr(MSR_IA32_APICBASE, l, h);
1633 l &= ~MSR_IA32_APICBASE_BASE;
1634 l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
1635 wrmsr(MSR_IA32_APICBASE, l, h);
1637 apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED);
1638 apic_write(APIC_ID, apic_pm_state.apic_id);
1639 apic_write(APIC_DFR, apic_pm_state.apic_dfr);
1640 apic_write(APIC_LDR, apic_pm_state.apic_ldr);
1641 apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri);
1642 apic_write(APIC_SPIV, apic_pm_state.apic_spiv);
1643 apic_write(APIC_LVT0, apic_pm_state.apic_lvt0);
1644 apic_write(APIC_LVT1, apic_pm_state.apic_lvt1);
1645 #ifdef CONFIG_X86_MCE_P4THERMAL
1647 apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr);
1650 apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc);
1651 apic_write(APIC_LVTT, apic_pm_state.apic_lvtt);
1652 apic_write(APIC_TDCR, apic_pm_state.apic_tdcr);
1653 apic_write(APIC_TMICT, apic_pm_state.apic_tmict);
1654 apic_write(APIC_ESR, 0);
1655 apic_read(APIC_ESR);
1656 apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr);
1657 apic_write(APIC_ESR, 0);
1658 apic_read(APIC_ESR);
1659 local_irq_restore(flags);
1664 * This device has no shutdown method - fully functioning local APICs
1665 * are needed on every CPU up until machine_halt/restart/poweroff.
1668 static struct sysdev_class lapic_sysclass = {
1670 .resume = lapic_resume,
1671 .suspend = lapic_suspend,
1674 static struct sys_device device_lapic = {
1676 .cls = &lapic_sysclass,
1679 static void __devinit apic_pm_activate(void)
1681 apic_pm_state.active = 1;
1684 static int __init init_lapic_sysfs(void)
1690 /* XXX: remove suspend/resume procs if !apic_pm_state.active? */
1692 error = sysdev_class_register(&lapic_sysclass);
1694 error = sysdev_register(&device_lapic);
1697 device_initcall(init_lapic_sysfs);
1699 #else /* CONFIG_PM */
1701 static void apic_pm_activate(void) { }
1703 #endif /* CONFIG_PM */
1706 * APIC command line parameters
1708 static int __init parse_lapic(char *arg)
1710 enable_local_apic = 1;
1713 early_param("lapic", parse_lapic);
1715 static int __init parse_nolapic(char *arg)
1717 enable_local_apic = -1;
1718 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
1721 early_param("nolapic", parse_nolapic);
1723 static int __init parse_disable_lapic_timer(char *arg)
1725 local_apic_timer_disabled = 1;
1728 early_param("nolapic_timer", parse_disable_lapic_timer);
1730 static int __init parse_lapic_timer_c2_ok(char *arg)
1732 local_apic_timer_c2_ok = 1;
1735 early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
1737 static int __init apic_set_verbosity(char *str)
1739 if (strcmp("debug", str) == 0)
1740 apic_verbosity = APIC_DEBUG;
1741 else if (strcmp("verbose", str) == 0)
1742 apic_verbosity = APIC_VERBOSE;
1745 __setup("apic=", apic_set_verbosity);