LXR linux/arch/h8300/kernel/time.c

   1/*
   2 *  linux/arch/h8300/kernel/time.c
   3 *
   4 *  Yoshinori Sato <ysato@users.sourceforge.jp>
   5 *
   6 *  Copied/hacked from:
   7 *
   8 *  linux/arch/m68k/kernel/time.c
   9 *
  10 *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
  11 *
  12 * This file contains the m68k-specific time handling details.
  13 * Most of the stuff is located in the machine specific files.
  14 *
  15 * 1997-09-10   Updated NTP code according to technical memorandum Jan '96
  16 *              "A Kernel Model for Precision Timekeeping" by Dave Mills
  17 */
  18
  19#include <linux/errno.h>
  20#include <linux/module.h>
  21#include <linux/sched.h>
  22#include <linux/kernel.h>
  23#include <linux/param.h>
  24#include <linux/string.h>
  25#include <linux/mm.h>
  26#include <linux/timex.h>
  27#include <linux/profile.h>
  28
  29#include <asm/io.h>
  30#include <asm/timer.h>
  31
  32#define TICK_SIZE (tick_nsec / 1000)
  33
  34void h8300_timer_tick(void)
  35{
  36        if (current->pid)
  37                profile_tick(CPU_PROFILING);
  38        write_seqlock(&xtime_lock);
  39        do_timer(1);
  40        write_sequnlock(&xtime_lock);
  41        update_process_times(user_mode(get_irq_regs()));
  42}
  43
  44void __init time_init(void)
  45{
  46        unsigned int year, mon, day, hour, min, sec;
  47
  48        /* FIX by dqg : Set to zero for platforms that don't have tod */
  49        /* without this time is undefined and can overflow time_t, causing  */
  50        /* very strange errors */
  51        year = 1980;
  52        mon = day = 1;
  53        hour = min = sec = 0;
  54#ifdef CONFIG_H8300_GETTOD
  55        h8300_gettod (&year, &mon, &day, &hour, &min, &sec);
  56#endif
  57        if ((year += 1900) < 1970)
  58                year += 100;
  59        xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
  60        xtime.tv_nsec = 0;
  61
  62        h8300_timer_setup();
  63}
  64