/* * linux/arch/h8300/kernel/time.c * * Yoshinori Sato <ysato@users.sourceforge.jp> * * Copied/hacked from: * * linux/arch/m68k/kernel/time.c * * Copyright (C) 1991, 1992, 1995 Linus Torvalds * * This file contains the m68k-specific time handling details. * Most of the stuff is located in the machine specific files. * * 1997-09-10 Updated NTP code according to technical memorandum Jan '96 * "A Kernel Model for Precision Timekeeping" by Dave Mills */ #include <linux/config.h> /* CONFIG_HEARTBEAT */ #include <linux/errno.h> #include <linux/module.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/param.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/timex.h> #include <linux/profile.h> #include <asm/io.h> #include <asm/target_time.h> #define TICK_SIZE (tick_nsec / 1000) u64 jiffies_64; EXPORT_SYMBOL(jiffies_64); /* * timer_interrupt() needs to keep up the real-time clock, * as well as call the "do_timer()" routine every clocktick */ static void timer_interrupt(int irq, void *dummy, struct pt_regs * regs) { /* may need to kick the hardware timer */ platform_timer_eoi(); do_timer(regs); #ifndef CONFIG_SMP update_process_times(user_mode(regs)); #endif profile_tick(CPU_PROFILING, regs); } void time_init(void) { unsigned int year, mon, day, hour, min, sec; /* FIX by dqg : Set to zero for platforms that don't have tod */ /* without this time is undefined and can overflow time_t, causing */ /* very stange errors */ year = 1980; mon = day = 1; hour = min = sec = 0; platform_gettod (&year, &mon, &day, &hour, &min, &sec); if ((year += 1900) < 1970) year += 100; xtime.tv_sec = mktime(year, mon, day, hour, min, sec); xtime.tv_nsec = 0; platform_timer_setup(timer_interrupt); } /* * This version of gettimeofday has near microsecond resolution. */ void do_gettimeofday(struct timeval *tv) { unsigned long flags; unsigned long usec, sec; read_lock_irqsave(&xtime_lock, flags); usec = 0; sec = xtime.tv_sec; usec += (xtime.tv_nsec / 1000); read_unlock_irqrestore(&xtime_lock, flags); while (usec >= 1000000) { usec -= 1000000; sec++; } tv->tv_sec = sec; tv->tv_usec = usec; } EXPORT_SYMBOL(do_gettimeofday); int do_settimeofday(struct timespec *tv) { if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC) return -EINVAL; write_lock_irq(&xtime_lock); /* This is revolting. We need to set the xtime.tv_usec * correctly. However, the value in this location is * is value at the last tick. * Discover what correction gettimeofday * would have done, and then undo it! */ while (tv->tv_nsec < 0) { tv->tv_nsec += NSEC_PER_SEC; tv->tv_sec--; } xtime.tv_sec = tv->tv_sec; xtime.tv_nsec = tv->tv_nsec; ntp_clear(); write_sequnlock_irq(&xtime_lock); clock_was_set(); return 0; } EXPORT_SYMBOL(do_settimeofday); unsigned long long sched_clock(void) { return (unsigned long long)jiffies * (1000000000 / HZ); }