| | 1 | /* |
| | 2 | * Copyright (c) 1991,1992,1995 Linus Torvalds |
| | 3 | * Copyright (c) 1994 Alan Modra |
| | 4 | * Copyright (c) 1995 Markus Kuhn |
| | 5 | * Copyright (c) 1996 Ingo Molnar |
| | 6 | * Copyright (c) 1998 Andrea Arcangeli |
| | 7 | * Copyright (c) 2002,2006 Vojtech Pavlik |
| | 8 | * Copyright (c) 2003 Andi Kleen |
| | 9 | * |
| | 10 | */ |
| | 11 | |
| | 12 | #include <linux/clockchips.h> |
| | 13 | #include <linux/interrupt.h> |
| | 14 | #include <linux/time.h> |
| | 15 | #include <linux/mca.h> |
| | 16 | |
| | 17 | #include <asm/vsyscall.h> |
| | 18 | #include <asm/x86_init.h> |
| | 19 | #include <asm/i8259.h> |
| | 20 | #include <asm/i8253.h> |
| | 21 | #include <asm/timer.h> |
| | 22 | #include <asm/hpet.h> |
| | 23 | #include <asm/time.h> |
| | 24 | |
| | 25 | #if defined(CONFIG_X86_32) && defined(CONFIG_X86_IO_APIC) |
| | 26 | int timer_ack; |
| | 27 | #endif |
| | 28 | |
| | 29 | #ifdef CONFIG_X86_64 |
| | 30 | volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES; |
| | 31 | #endif |
| | 32 | |
| | 33 | unsigned long profile_pc(struct pt_regs *regs) |
| | 34 | { |
| | 35 | unsigned long pc = instruction_pointer(regs); |
| | 36 | |
| | 37 | if (!user_mode_vm(regs) && in_lock_functions(pc)) { |
| | 38 | #ifdef CONFIG_FRAME_POINTER |
| | 39 | return *(unsigned long *)(regs->bp + sizeof(long)); |
| | 40 | #else |
| | 41 | unsigned long *sp = |
| | 42 | (unsigned long *)kernel_stack_pointer(regs); |
| | 43 | /* |
| | 44 | * Return address is either directly at stack pointer |
| | 45 | * or above a saved flags. Eflags has bits 22-31 zero, |
| | 46 | * kernel addresses don't. |
| | 47 | */ |
| | 48 | if (sp[0] >> 22) |
| | 49 | return sp[0]; |
| | 50 | if (sp[1] >> 22) |
| | 51 | return sp[1]; |
| | 52 | #endif |
| | 53 | } |
| | 54 | return pc; |
| | 55 | } |
| | 56 | EXPORT_SYMBOL(profile_pc); |
| | 57 | |
| | 58 | /* |
| | 59 | * Default timer interrupt handler for PIT/HPET |
| | 60 | */ |
| | 61 | static irqreturn_t timer_interrupt(int irq, void *dev_id) |
| | 62 | { |
| | 63 | /* Keep nmi watchdog up to date */ |
| | 64 | inc_irq_stat(irq0_irqs); |
| | 65 | |
| | 66 | /* Optimized out for !IO_APIC and x86_64 */ |
| | 67 | if (timer_ack) { |
| | 68 | /* |
| | 69 | * Subtle, when I/O APICs are used we have to ack timer IRQ |
| | 70 | * manually to deassert NMI lines for the watchdog if run |
| | 71 | * on an 82489DX-based system. |
| | 72 | */ |
| | 73 | raw_spin_lock(&i8259A_lock); |
| | 74 | outb(0x0c, PIC_MASTER_OCW3); |
| | 75 | /* Ack the IRQ; AEOI will end it automatically. */ |
| | 76 | inb(PIC_MASTER_POLL); |
| | 77 | raw_spin_unlock(&i8259A_lock); |
| | 78 | } |
| | 79 | |
| | 80 | global_clock_event->event_handler(global_clock_event); |
| | 81 | |
| | 82 | /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */ |
| | 83 | if (MCA_bus) |
| | 84 | outb_p(inb_p(0x61)| 0x80, 0x61); |
| | 85 | |
| | 86 | return IRQ_HANDLED; |
| | 87 | } |
| | 88 | |
| | 89 | static struct irqaction irq0 = { |
| | 90 | .handler = timer_interrupt, |
| | 91 | .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER, |
| | 92 | .name = "timer" |
| | 93 | }; |
| | 94 | |
| | 95 | void __init setup_default_timer_irq(void) |
| | 96 | { |
| | 97 | setup_irq(0, &irq0); |
| | 98 | } |
| | 99 | |
| | 100 | /* Default timer init function */ |
| | 101 | void __init hpet_time_init(void) |
| | 102 | { |
| | 103 | if (!hpet_enable()) |
| | 104 | setup_pit_timer(); |
| | 105 | setup_default_timer_irq(); |
| | 106 | } |
| | 107 | |
| | 108 | static __init void x86_late_time_init(void) |
| | 109 | { |
| | 110 | x86_init.timers.timer_init(); |
| | 111 | tsc_init(); |
| | 112 | } |
| | 113 | |
| | 114 | /* |
| | 115 | * Initialize TSC and delay the periodic timer init to |
| | 116 | * late x86_late_time_init() so ioremap works. |
| | 117 | */ |
| | 118 | void __init time_init(void) |
| | 119 | { |
| | 120 | late_time_init = x86_late_time_init; |
| | 121 | } |
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