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/irq_regs.h>
  31 #include <asm/timer.h>
  32
  33 #define TICK_SIZE (tick_nsec / 1000)
  34
  35 void h8300_timer_tick(void)
  36 {
  37         if (current->pid)
  38                 profile_tick(CPU_PROFILING);
  39         xtime_update(1);
  40         update_process_times(user_mode(get_irq_regs()));
  41 }
  42
  43 void read_persistent_clock(struct timespec *ts)
  44 {
  45         unsigned int year, mon, day, hour, min, sec;
  46
  47         /* FIX by dqg : Set to zero for platforms that don't have tod */
  48         /* without this time is undefined and can overflow time_t, causing  */
  49         /* very strange errors */
  50         year = 1980;
  51         mon = day = 1;
  52         hour = min = sec = 0;
  53 #ifdef CONFIG_H8300_GETTOD
  54         h8300_gettod (&year, &mon, &day, &hour, &min, &sec);
  55 #endif
  56         if ((year += 1900) < 1970)
  57                 year += 100;
  58         ts->tv_sec = mktime(year, mon, day, hour, min, sec);
  59         ts->tv_nsec = 0;
  60 }
  61
  62 void __init time_init(void)
  63 {
  64
  65         h8300_timer_setup();
  66 }