2
* linux/arch/m68knommu/kernel/time.c
4
* Copyright (C) 1991, 1992, 1995 Linus Torvalds
6
* This file contains the m68k-specific time handling details.
7
* Most of the stuff is located in the machine specific files.
9
* 1997-09-10 Updated NTP code according to technical memorandum Jan '96
10
* "A Kernel Model for Precision Timekeeping" by Dave Mills
13
#include <linux/errno.h>
14
#include <linux/module.h>
15
#include <linux/sched.h>
16
#include <linux/kernel.h>
17
#include <linux/param.h>
18
#include <linux/string.h>
20
#include <linux/profile.h>
21
#include <linux/time.h>
22
#include <linux/timex.h>
24
#include <asm/machdep.h>
25
#include <asm/irq_regs.h>
27
#define TICK_SIZE (tick_nsec / 1000)
29
static inline int set_rtc_mmss(unsigned long nowtime)
31
if (mach_set_clock_mmss)
32
return mach_set_clock_mmss (nowtime);
36
#ifndef CONFIG_GENERIC_CLOCKEVENTS
38
* timer_interrupt() needs to keep up the real-time clock,
39
* as well as call the "do_timer()" routine every clocktick
41
irqreturn_t arch_timer_interrupt(int irq, void *dummy)
45
profile_tick(CPU_PROFILING);
47
write_seqlock(&xtime_lock);
51
write_sequnlock(&xtime_lock);
53
update_process_times(user_mode(get_irq_regs()));
59
static unsigned long read_rtc_mmss(void)
61
unsigned int year, mon, day, hour, min, sec;
64
mach_gettod(&year, &mon, &day, &hour, &min, &sec);
65
if ((year += 1900) < 1970)
74
return mktime(year, mon, day, hour, min, sec);
77
void read_persistent_clock(struct timespec *ts)
79
ts->tv_sec = read_rtc_mmss();
83
int update_persistent_clock(struct timespec now)
85
return set_rtc_mmss(now.tv_sec);