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
  34 void 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
  44 void __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 }