mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-14 05:16:41 +07:00
135 lines
3.0 KiB
C
135 lines
3.0 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)
|
||
|
|
||
|
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;
|
||
|
time_adjust = 0; /* stop active adjtime() */
|
||
|
time_status |= STA_UNSYNC;
|
||
|
time_maxerror = NTP_PHASE_LIMIT;
|
||
|
time_esterror = NTP_PHASE_LIMIT;
|
||
|
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);
|
||
|
|
||
|
}
|