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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 #include <linux/mca.h>
 18 
 19 #include <asm/vsyscall.h>
 20 #include <asm/x86_init.h>
 21 #include <asm/i8259.h>
 22 #include <asm/timer.h>
 23 #include <asm/hpet.h>
 24 #include <asm/time.h>
 25 
 26 #ifdef CONFIG_X86_64
 27 DEFINE_VVAR(volatile unsigned long, jiffies) = INITIAL_JIFFIES;
 28 #endif
 29 
 30 unsigned long profile_pc(struct pt_regs *regs)
 31 {
 32         unsigned long pc = instruction_pointer(regs);
 33 
 34         if (!user_mode_vm(regs) && in_lock_functions(pc)) {
 35 #ifdef CONFIG_FRAME_POINTER
 36                 return *(unsigned long *)(regs->bp + sizeof(long));
 37 #else
 38                 unsigned long *sp =
 39                         (unsigned long *)kernel_stack_pointer(regs);
 40                 /*
 41                  * Return address is either directly at stack pointer
 42                  * or above a saved flags. Eflags has bits 22-31 zero,
 43                  * kernel addresses don't.
 44                  */
 45                 if (sp[0] >> 22)
 46                         return sp[0];
 47                 if (sp[1] >> 22)
 48                         return sp[1];
 49 #endif
 50         }
 51         return pc;
 52 }
 53 EXPORT_SYMBOL(profile_pc);
 54 
 55 /*
 56  * Default timer interrupt handler for PIT/HPET
 57  */
 58 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 59 {
 60         /* Keep nmi watchdog up to date */
 61         inc_irq_stat(irq0_irqs);
 62 
 63         global_clock_event->event_handler(global_clock_event);
 64 
 65         /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
 66         if (MCA_bus)
 67                 outb_p(inb_p(0x61)| 0x80, 0x61);
 68 
 69         return IRQ_HANDLED;
 70 }
 71 
 72 static struct irqaction irq0  = {
 73         .handler = timer_interrupt,
 74         .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
 75         .name = "timer"
 76 };
 77 
 78 void __init setup_default_timer_irq(void)
 79 {
 80         setup_irq(0, &irq0);
 81 }
 82 
 83 /* Default timer init function */
 84 void __init hpet_time_init(void)
 85 {
 86         if (!hpet_enable())
 87                 setup_pit_timer();
 88         setup_default_timer_irq();
 89 }
 90 
 91 static __init void x86_late_time_init(void)
 92 {
 93         x86_init.timers.timer_init();
 94         tsc_init();
 95 }
 96 
 97 /*
 98  * Initialize TSC and delay the periodic timer init to
 99  * late x86_late_time_init() so ioremap works.
100  */
101 void __init time_init(void)
102 {
103         late_time_init = x86_late_time_init;
104 }
105 

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