3171a0305d
Pass ticks to do_timer() and update_times(), and adjust x86_64 and s390
timer interrupt handler with this change.
Currently update_times() calculates ticks by "jiffies - wall_jiffies", but
callers of do_timer() should know how many ticks to update. Passing ticks
get rid of this redundant calculation. Also there are another redundancy
pointed out by Martin Schwidefsky.
This cleanup make a barrier added by
5aee405c66 needless. So this patch removes
it.
As a bonus, this cleanup make wall_jiffies can be removed easily, since now
wall_jiffies is always synced with jiffies. (This patch does not really
remove wall_jiffies. It would be another cleanup patch)
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Mikael Starvik <starvik@axis.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Hirokazu Takata <takata.hirokazu@renesas.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Acked-by: "Luck, Tony" <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
/*
|
|
* 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)
|
|
|
|
/*
|
|
* 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(1);
|
|
#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);
|
|
|
|
}
|