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 read_persistent_clock(struct timespec *ts) 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 ts->tv_sec = mktime(year, mon, day, hour, min, sec); 60 ts->tv_nsec = 0; 61} 62 63void __init time_init(void) 64{ 65 66 h8300_timer_setup(); 67} 68