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/target_time.h> 31 32#define TICK_SIZE (tick_nsec / 1000) 33 34/* 35 * timer_interrupt() needs to keep up the real-time clock, 36 * as well as call the "do_timer()" routine every clocktick 37 */ 38static void timer_interrupt(int irq, void *dummy, struct pt_regs * regs) 39{ 40 /* may need to kick the hardware timer */ 41 platform_timer_eoi(); 42 43 do_timer(1); 44#ifndef CONFIG_SMP 45 update_process_times(user_mode(regs)); 46#endif 47 profile_tick(CPU_PROFILING); 48} 49 50void time_init(void) 51{ 52 unsigned int year, mon, day, hour, min, sec; 53 54 /* FIX by dqg : Set to zero for platforms that don't have tod */ 55 /* without this time is undefined and can overflow time_t, causing */ 56 /* very stange errors */ 57 year = 1980; 58 mon = day = 1; 59 hour = min = sec = 0; 60 platform_gettod (&year, &mon, &day, &hour, &min, &sec); 61 62 if ((year += 1900) < 1970) 63 year += 100; 64 xtime.tv_sec = mktime(year, mon, day, hour, min, sec); 65 xtime.tv_nsec = 0; 66 67 platform_timer_setup(timer_interrupt); 68} 69