| 1 | |
| 2 | |
| 3 | * Copyright (c) 1991,1992,1995 Linus Torvalds
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| 4 | * Copyright (c) 1994 Alan Modra
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| 5 | * Copyright (c) 1995 Markus Kuhn
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| 6 | * Copyright (c) 1996 Ingo Molnar
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| 7 | * Copyright (c) 1998 Andrea Arcangeli
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| 8 | * Copyright (c) 2002,2006 Vojtech Pavlik
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| 9 | * Copyright (c) 2003 Andi Kleen
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| 10 | *
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| 11 |
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| 12 |
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| 13 | #include <linux/clocksource.h>
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| 14 | #include <linux/clockchips.h>
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| 15 | #include <linux/interrupt.h>
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| 16 | #include <linux/irq.h>
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| 17 | #include <linux/i8253.h>
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| 18 | #include <linux/time.h>
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| 19 | #include <linux/export.h>
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| 20 |
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| 21 | #include <asm/vsyscall.h>
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| 22 | #include <asm/x86_init.h>
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| 23 | #include <asm/i8259.h>
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| 24 | #include <asm/timer.h>
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| 25 | #include <asm/hpet.h>
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| 26 | #include <asm/time.h>
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| 27 |
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| 28 | unsigned long profile_pc(struct pt_regs *regs)
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| 29 | {
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| 30 | return instruction_pointer(regs);
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| 31 | }
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| 32 | EXPORT_SYMBOL(profile_pc);
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| 33 |
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| 34 | |
| 35 | * Default timer interrupt handler for PIT/HPET
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| 36 |
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| 37 | static irqreturn_t timer_interrupt(int irq, void *dev_id)
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| 38 | {
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| 39 | global_clock_event->event_handler(global_clock_event);
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| 40 | return IRQ_HANDLED;
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| 41 | }
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| 42 |
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| 43 | static void __init setup_default_timer_irq(void)
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| 44 | {
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| 45 | unsigned long flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER;
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| 46 |
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| 47 | |
| 48 | * Unconditionally register the legacy timer interrupt; even
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| 49 | * without legacy PIC/PIT we need this for the HPET0 in legacy
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| 50 | * replacement mode.
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| 51 |
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| 52 | if (request_irq(0, timer_interrupt, flags, "timer", NULL))
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| 53 | pr_info("Failed to register legacy timer interrupt\n");
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| 54 | }
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| 55 |
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| 56 |
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| 57 | void __init hpet_time_init(void)
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| 58 | {
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| 59 | if (!hpet_enable()) {
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| 60 | if (!pit_timer_init())
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| 61 | return;
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| 62 | }
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| 63 |
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| 64 | setup_default_timer_irq();
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| 65 | }
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| 66 |
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| 67 | static __init void x86_late_time_init(void)
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| 68 | {
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| 69 | |
| 70 | * Before PIT/HPET init, select the interrupt mode. This is required
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| 71 | * to make the decision whether PIT should be initialized correct.
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| 72 |
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| 73 | x86_init.irqs.intr_mode_select();
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| 74 |
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| 75 |
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| 76 | x86_init.timers.timer_init();
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| 77 |
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| 78 | |
| 79 | * After PIT/HPET timers init, set up the final interrupt mode for
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| 80 | * delivering IRQs.
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| 81 |
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| 82 | x86_init.irqs.intr_mode_init();
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| 83 | tsc_init();
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| 84 |
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| 85 | if (cpu_feature_enabled(X86_FEATURE_WAITPKG))
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| 86 | use_tpause_delay();
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| 87 | }
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| 88 |
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| 89 | |
| 90 | * Initialize TSC and delay the periodic timer init to
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| 91 | * late x86_late_time_init() so ioremap works.
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| 92 |
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| 93 | void __init time_init(void)
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| 94 | {
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| 95 | late_time_init = x86_late_time_init;
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| 96 | }
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| 97 |
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| 98 | |
| 99 | * Sanity check the vdso related archdata content.
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| 100 |
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| 101 | void clocksource_arch_init(struct clocksource *cs)
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| 102 | {
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| 103 | if (cs->vdso_clock_mode == VDSO_CLOCKMODE_NONE)
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| 104 | return;
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| 105 |
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| 106 | if (cs->mask != CLOCKSOURCE_MASK(64)) {
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| 107 | pr_warn("clocksource %s registered with invalid mask %016llx for VDSO. Disabling VDSO support.\n",
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| 108 | cs->name, cs->mask);
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| 109 | cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE;
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| 110 | }
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| 111 | }
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