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Linux/arch/x86/kernel/time.c

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  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/i8253.h>
 15 #include <linux/time.h>
 16 #include <linux/export.h>
 17 
 18 #include <asm/vsyscall.h>
 19 #include <asm/x86_init.h>
 20 #include <asm/i8259.h>
 21 #include <asm/timer.h>
 22 #include <asm/hpet.h>
 23 #include <asm/time.h>
 24 
 25 #ifdef CONFIG_X86_64
 26 __visible volatile unsigned long jiffies __cacheline_aligned = INITIAL_JIFFIES;
 27 #endif
 28 
 29 unsigned long profile_pc(struct pt_regs *regs)
 30 {
 31         unsigned long pc = instruction_pointer(regs);
 32 
 33         if (!user_mode(regs) && in_lock_functions(pc)) {
 34 #ifdef CONFIG_FRAME_POINTER
 35                 return *(unsigned long *)(regs->bp + sizeof(long));
 36 #else
 37                 unsigned long *sp =
 38                         (unsigned long *)kernel_stack_pointer(regs);
 39                 /*
 40                  * Return address is either directly at stack pointer
 41                  * or above a saved flags. Eflags has bits 22-31 zero,
 42                  * kernel addresses don't.
 43                  */
 44                 if (sp[0] >> 22)
 45                         return sp[0];
 46                 if (sp[1] >> 22)
 47                         return sp[1];
 48 #endif
 49         }
 50         return pc;
 51 }
 52 EXPORT_SYMBOL(profile_pc);
 53 
 54 /*
 55  * Default timer interrupt handler for PIT/HPET
 56  */
 57 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 58 {
 59         global_clock_event->event_handler(global_clock_event);
 60         return IRQ_HANDLED;
 61 }
 62 
 63 static struct irqaction irq0  = {
 64         .handler = timer_interrupt,
 65         .flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
 66         .name = "timer"
 67 };
 68 
 69 void __init setup_default_timer_irq(void)
 70 {
 71         if (!nr_legacy_irqs())
 72                 return;
 73         setup_irq(0, &irq0);
 74 }
 75 
 76 /* Default timer init function */
 77 void __init hpet_time_init(void)
 78 {
 79         if (!hpet_enable())
 80                 setup_pit_timer();
 81         setup_default_timer_irq();
 82 }
 83 
 84 static __init void x86_late_time_init(void)
 85 {
 86         x86_init.timers.timer_init();
 87         tsc_init();
 88 }
 89 
 90 /*
 91  * Initialize TSC and delay the periodic timer init to
 92  * late x86_late_time_init() so ioremap works.
 93  */
 94 void __init time_init(void)
 95 {
 96         late_time_init = x86_late_time_init;
 97 }
 98 

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