static ssize_t clocksource_read_time(struct kobj_t * kobj, void * buf, size_t size)
{
struct clocksource_t * cs = (struct clocksource_t *)kobj->priv;
u64_t cycle = clocksource_cycle(cs);
u64_t time = clocksource_delta2ns(cs, cycle);
return sprintf(buf, "%llu.%09llu", time / 1000000000ULL, time % 1000000000ULL);
}
bool_t register_clocksource(struct device_t ** device, struct clocksource_t * cs)
{
struct device_t * dev;
irq_flags_t flags;
if(!cs || !cs->name || !cs->read)
return FALSE;
dev = malloc(sizeof(struct device_t));
if(!dev)
return FALSE;
cs->keeper.interval = clocksource_deferment(cs) >> 1;
cs->keeper.last = clocksource_cycle(cs);
cs->keeper.nsec = 0;
seqlock_init(&cs->keeper.lock);
timer_init(&cs->keeper.timer, clocksource_keeper_timer_function, cs);
dev->name = strdup(cs->name);
dev->type = DEVICE_TYPE_CLOCKSOURCE;
dev->driver = NULL;
dev->priv = cs;
dev->kobj = kobj_alloc_directory(dev->name);
kobj_add_regular(dev->kobj, "mult", clocksource_read_mult, NULL, cs);
kobj_add_regular(dev->kobj, "shift", clocksource_read_shift, NULL, cs);
kobj_add_regular(dev->kobj, "period", clocksource_read_period, NULL, cs);
kobj_add_regular(dev->kobj, "deferment", clocksource_read_deferment, NULL, cs);
kobj_add_regular(dev->kobj, "cycle", clocksource_read_cycle, NULL, cs);
kobj_add_regular(dev->kobj, "time", clocksource_read_time, NULL, cs);
if(!register_device(dev))
{
kobj_remove_self(dev->kobj);
free(dev->name);
free(dev);
return FALSE;
}
if(__clocksource == &__cs_dummy)
{
spin_lock_irqsave(&__clocksource_lock, flags);
__clocksource = cs;
spin_unlock_irqrestore(&__clocksource_lock, flags);
}
timer_start_now(&cs->keeper.timer, ns_to_ktime(cs->keeper.interval));
if(device)
*device = dev;
return TRUE;
}
static int clocksource_keeper_timer_function(struct timer_t * timer, void * data)
{
struct clocksource_t * cs = (struct clocksource_t *)(data);
u64_t now, delta, offset;
irq_flags_t flags;
write_seqlock_irqsave(&cs->keeper.lock, flags);
now = clocksource_cycle(cs);
delta = clocksource_delta(cs, cs->keeper.last, now);
offset = clocksource_delta2ns(cs, delta);
cs->keeper.nsec += offset;
cs->keeper.last = now;
write_sequnlock_irqrestore(&cs->keeper.lock, flags);
timer_forward_now(timer, ns_to_ktime(cs->keeper.interval));
return 1;
}
static ssize_t clocksource_read_cycle(struct kobj_t * kobj, void * buf, size_t size)
{
struct clocksource_t * cs = (struct clocksource_t *)kobj->priv;
return sprintf(buf, "%llu", clocksource_cycle(cs));
}