*/
/*
* Modification history kernel/time.c
- *
+ *
* 1993-09-02 Philip Gladstone
- * Created file with time related functions from sched.c and adjtimex()
+ * Created file with time related functions from sched.c and adjtimex()
* 1993-10-08 Torsten Duwe
* adjtime interface update and CMOS clock write code
* 1995-08-13 Torsten Duwe
#include <linux/module.h>
#include <linux/timex.h>
#include <linux/capability.h>
+#include <linux/clocksource.h>
#include <linux/errno.h>
#include <linux/syscalls.h>
#include <linux/security.h>
#include <linux/fs.h>
-#include <linux/module.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
-/*
+/*
* The timezone where the local system is located. Used as a default by some
* programs who obtain this value by using gettimeofday.
*/
*/
asmlinkage long sys_time(time_t __user * tloc)
{
- /*
- * We read xtime.tv_sec atomically - it's updated
- * atomically by update_wall_time(), so no need to
- * even read-lock the xtime seqlock:
- */
- time_t i = xtime.tv_sec;
-
- smp_rmb(); /* sys_time() results are coherent */
+ time_t i = get_seconds();
if (tloc) {
- if (put_user(i, tloc))
+ if (put_user(i,tloc))
i = -EFAULT;
}
return i;
* why not move it into the appropriate arch directory (for those
* architectures that need it).
*/
-
+
asmlinkage long sys_stime(time_t __user *tptr)
{
struct timespec tv;
/*
* Adjust the time obtained from the CMOS to be UTC time instead of
* local time.
- *
+ *
* This is ugly, but preferable to the alternatives. Otherwise we
* would either need to write a program to do it in /etc/rc (and risk
- * confusion if the program gets run more than once; it would also be
+ * confusion if the program gets run more than once; it would also be
* hard to make the program warp the clock precisely n hours) or
* compile in the timezone information into the kernel. Bad, bad....
*
write_seqlock_irq(&xtime_lock);
wall_to_monotonic.tv_sec -= sys_tz.tz_minuteswest * 60;
xtime.tv_sec += sys_tz.tz_minuteswest * 60;
- time_interpolator_reset();
write_sequnlock_irq(&xtime_lock);
clock_was_set();
}
if (tz) {
/* SMP safe, global irq locking makes it work. */
sys_tz = *tz;
+ update_vsyscall_tz();
if (firsttime) {
firsttime = 0;
if (!tv)
return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret;
}
-inline struct timespec current_kernel_time(void)
-{
- struct timespec now;
- unsigned long seq;
-
- do {
- seq = read_seqbegin(&xtime_lock);
-
- now = xtime;
- } while (read_seqretry(&xtime_lock, seq));
-
- return now;
-}
-
-EXPORT_SYMBOL(current_kernel_time);
-
/**
* current_fs_time - Return FS time
* @sb: Superblock.
}
EXPORT_SYMBOL(timespec_trunc);
-#ifdef CONFIG_TIME_INTERPOLATION
-void getnstimeofday (struct timespec *tv)
-{
- unsigned long seq,sec,nsec;
-
- do {
- seq = read_seqbegin(&xtime_lock);
- sec = xtime.tv_sec;
- nsec = xtime.tv_nsec+time_interpolator_get_offset();
- } while (unlikely(read_seqretry(&xtime_lock, seq)));
-
- while (unlikely(nsec >= NSEC_PER_SEC)) {
- nsec -= NSEC_PER_SEC;
- ++sec;
- }
- tv->tv_sec = sec;
- tv->tv_nsec = nsec;
-}
-EXPORT_SYMBOL_GPL(getnstimeofday);
-
-int do_settimeofday (struct timespec *tv)
-{
- time_t wtm_sec, sec = tv->tv_sec;
- long wtm_nsec, nsec = tv->tv_nsec;
-
- if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
- return -EINVAL;
-
- write_seqlock_irq(&xtime_lock);
- {
- wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
- wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
-
- set_normalized_timespec(&xtime, sec, nsec);
- set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
-
- time_adjust = 0; /* stop active adjtime() */
- time_status |= STA_UNSYNC;
- time_maxerror = NTP_PHASE_LIMIT;
- time_esterror = NTP_PHASE_LIMIT;
- time_interpolator_reset();
- }
- write_sequnlock_irq(&xtime_lock);
- clock_was_set();
- return 0;
-}
-EXPORT_SYMBOL(do_settimeofday);
-
-void do_gettimeofday (struct timeval *tv)
-{
- unsigned long seq, nsec, usec, sec, offset;
- do {
- seq = read_seqbegin(&xtime_lock);
- offset = time_interpolator_get_offset();
- sec = xtime.tv_sec;
- nsec = xtime.tv_nsec;
- } while (unlikely(read_seqretry(&xtime_lock, seq)));
-
- usec = (nsec + offset) / 1000;
-
- while (unlikely(usec >= USEC_PER_SEC)) {
- usec -= USEC_PER_SEC;
- ++sec;
- }
-
- tv->tv_sec = sec;
- tv->tv_usec = usec;
-
- /*
- * Make sure xtime.tv_sec [returned by sys_time()] always
- * follows the gettimeofday() result precisely. This
- * condition is extremely unlikely, it can hit at most
- * once per second:
- */
- if (unlikely(xtime.tv_sec != tv->tv_sec)) {
- unsigned long flags;
-
- write_seqlock_irqsave(&xtime_lock, flags);
- update_wall_time();
- write_sequnlock_irqrestore(&xtime_lock, flags);
- }
-}
-EXPORT_SYMBOL(do_gettimeofday);
-
-#else /* CONFIG_TIME_INTERPOLATION */
-
#ifndef CONFIG_GENERIC_TIME
/*
* Simulate gettimeofday using do_gettimeofday which only allows a timeval
}
EXPORT_SYMBOL_GPL(getnstimeofday);
#endif
-#endif /* CONFIG_TIME_INTERPOLATION */
/* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
* Assumes input in normal date format, i.e. 1980-12-31 23:59:59