#include "mach_time.h"
#include <linux/timex.h>
+#include <linux/config.h>
#include <asm/hpet.h>
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
+#include <asm/i8253.h>
+
+DEFINE_SPINLOCK(i8253_lock);
+EXPORT_SYMBOL(i8253_lock);
+
+struct timer_opts *cur_timer __read_mostly = &timer_none;
+
/*
* This is a special lock that is owned by the CPU and holds the index
* register we are working with. It is required for NMI access to the
}
EXPORT_SYMBOL(rtc_cmos_write);
+/*
+ * This version of gettimeofday has microsecond resolution
+ * and better than microsecond precision on fast x86 machines with TSC.
+ */
+void do_gettimeofday(struct timeval *tv)
+{
+ unsigned long seq;
+ unsigned long usec, sec;
+ unsigned long max_ntp_tick;
+
+ do {
+ unsigned long lost;
+
+ seq = read_seqbegin(&xtime_lock);
+
+ usec = cur_timer->get_offset();
+ lost = jiffies - wall_jiffies;
+
+ /*
+ * If time_adjust is negative then NTP is slowing the clock
+ * so make sure not to go into next possible interval.
+ * Better to lose some accuracy than have time go backwards..
+ */
+ if (unlikely(time_adjust < 0)) {
+ max_ntp_tick = (USEC_PER_SEC / HZ) - tickadj;
+ usec = min(usec, max_ntp_tick);
+
+ if (lost)
+ usec += lost * max_ntp_tick;
+ }
+ else if (unlikely(lost))
+ usec += lost * (USEC_PER_SEC / HZ);
+
+ sec = xtime.tv_sec;
+ usec += (xtime.tv_nsec / 1000);
+ } while (read_seqretry(&xtime_lock, seq));
+
+ while (usec >= 1000000) {
+ usec -= 1000000;
+ sec++;
+ }
+
+ tv->tv_sec = sec;
+ tv->tv_usec = usec;
+}
+
+EXPORT_SYMBOL(do_gettimeofday);
+
+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);
+ /*
+ * This is revolting. We need to set "xtime" correctly. However, the
+ * value in this location is the value at the most recent update of
+ * wall time. Discover what correction gettimeofday() would have
+ * made, and then undo it!
+ */
+ nsec -= cur_timer->get_offset() * NSEC_PER_USEC;
+ nsec -= (jiffies - wall_jiffies) * TICK_NSEC;
+
+ 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);
+
+ ntp_clear();
+ write_sequnlock_irq(&xtime_lock);
+ clock_was_set();
+ return 0;
+}
+
+EXPORT_SYMBOL(do_settimeofday);
+
static int set_rtc_mmss(unsigned long nowtime)
{
int retval;
- unsigned long flags;
+
+ WARN_ON(irqs_disabled());
/* gets recalled with irq locally disabled */
- /* XXX - does irqsave resolve this? -johnstul */
- spin_lock_irqsave(&rtc_lock, flags);
+ spin_lock_irq(&rtc_lock);
if (efi_enabled)
retval = efi_set_rtc_mmss(nowtime);
else
retval = mach_set_rtc_mmss(nowtime);
- spin_unlock_irqrestore(&rtc_lock, flags);
+ spin_unlock_irq(&rtc_lock);
return retval;
}
int timer_ack;
+/* monotonic_clock(): returns # of nanoseconds passed since time_init()
+ * Note: This function is required to return accurate
+ * time even in the absence of multiple timer ticks.
+ */
+unsigned long long monotonic_clock(void)
+{
+ return cur_timer->monotonic_clock();
+}
+EXPORT_SYMBOL(monotonic_clock);
+
#if defined(CONFIG_SMP) && defined(CONFIG_FRAME_POINTER)
unsigned long profile_pc(struct pt_regs *regs)
{
unsigned long pc = instruction_pointer(regs);
- if (!user_mode_vm(regs) && in_lock_functions(pc))
+ if (in_lock_functions(pc))
return *(unsigned long *)(regs->ebp + 4);
return pc;
#endif
/*
- * This is the same as the above, except we _also_ save the current
- * Time Stamp Counter value at the time of the timer interrupt, so that
- * we later on can estimate the time of day more exactly.
+ * timer_interrupt() needs to keep up the real-time clock,
+ * as well as call the "do_timer()" routine every clocktick
*/
-irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static inline void do_timer_interrupt(int irq, struct pt_regs *regs)
{
- /*
- * Here we are in the timer irq handler. We just have irqs locally
- * disabled but we don't know if the timer_bh is running on the other
- * CPU. We need to avoid to SMP race with it. NOTE: we don' t need
- * the irq version of write_lock because as just said we have irq
- * locally disabled. -arca
- */
- write_seqlock(&xtime_lock);
-
#ifdef CONFIG_X86_IO_APIC
if (timer_ack) {
/*
irq = inb_p( 0x61 ); /* read the current state */
outb_p( irq|0x80, 0x61 ); /* reset the IRQ */
}
+}
+
+/*
+ * This is the same as the above, except we _also_ save the current
+ * Time Stamp Counter value at the time of the timer interrupt, so that
+ * we later on can estimate the time of day more exactly.
+ */
+irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ /*
+ * Here we are in the timer irq handler. We just have irqs locally
+ * disabled but we don't know if the timer_bh is running on the other
+ * CPU. We need to avoid to SMP race with it. NOTE: we don' t need
+ * the irq version of write_lock because as just said we have irq
+ * locally disabled. -arca
+ */
+ write_seqlock(&xtime_lock);
+
+ cur_timer->mark_offset();
+
+ do_timer_interrupt(irq, regs);
write_sequnlock(&xtime_lock);
unsigned long get_cmos_time(void)
{
unsigned long retval;
- unsigned long flags;
- spin_lock_irqsave(&rtc_lock, flags);
+ spin_lock(&rtc_lock);
if (efi_enabled)
retval = efi_get_time();
else
retval = mach_get_cmos_time();
- spin_unlock_irqrestore(&rtc_lock, flags);
+ spin_unlock(&rtc_lock);
return retval;
}
static long clock_cmos_diff, sleep_start;
+static struct timer_opts *last_timer;
static int timer_suspend(struct sys_device *dev, pm_message_t state)
{
/*
clock_cmos_diff = -get_cmos_time();
clock_cmos_diff += get_seconds();
sleep_start = get_cmos_time();
+ last_timer = cur_timer;
+ cur_timer = &timer_none;
+ if (last_timer->suspend)
+ last_timer->suspend(state);
return 0;
}
jiffies_64 += sleep_length;
wall_jiffies += sleep_length;
write_sequnlock_irqrestore(&xtime_lock, flags);
+ if (last_timer->resume)
+ last_timer->resume();
+ cur_timer = last_timer;
+ last_timer = NULL;
touch_softlockup_watchdog();
return 0;
}
printk("Using HPET for base-timer\n");
}
+ cur_timer = select_timer();
+ printk(KERN_INFO "Using %s for high-res timesource\n",cur_timer->name);
+
time_init_hook();
}
#endif
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
+ cur_timer = select_timer();
+ printk(KERN_INFO "Using %s for high-res timesource\n",cur_timer->name);
+
time_init_hook();
}
git://git.onelab.eu / linux-2.6.git / blobdiff