void timer_irq(union uml_pt_regs *regs)
{
unsigned long long ticks = 0;
#ifdef CONFIG_UML_REAL_TIME_CLOCK
if(prev_nsecs){
/* We've had 1 tick */
unsigned long long nsecs = os_nsecs();
delta += nsecs - prev_nsecs;
prev_nsecs = nsecs;
/* Protect against the host clock being set backwards */
if(delta < 0)
delta = 0;
ticks += (delta * HZ) / BILLION;
delta -= (ticks * BILLION) / HZ;
}
else prev_nsecs = os_nsecs();
#else
ticks = 1;
#endif
while(ticks > 0){
do_IRQ(TIMER_IRQ, regs);
ticks--;
}
}
void read_persistent_clock(struct timespec *ts)
{
long long nsecs = os_nsecs();
set_normalized_timespec(ts, nsecs / NSEC_PER_SEC,
nsecs % NSEC_PER_SEC);
}
void time_init_kern(void)
{
long long nsecs;
nsecs = os_nsecs();
set_normalized_timespec(&wall_to_monotonic, -nsecs / BILLION,
-nsecs % BILLION);
}
void time_init(void)
{
long long nsecs;
nsecs = os_nsecs();
set_normalized_timespec(&wall_to_monotonic, -nsecs / BILLION,
-nsecs % BILLION);
late_time_init = register_timer;
}
static inline void set_time(unsigned long long nsecs)
{
unsigned long long now;
unsigned long flags;
spin_lock_irqsave(&timer_spinlock, flags);
now = os_nsecs();
local_offset = nsecs - now;
spin_unlock_irqrestore(&timer_spinlock, flags);
clock_was_set();
}
static inline unsigned long long get_time(void)
{
unsigned long long nsecs;
unsigned long flags;
spin_lock_irqsave(&timer_spinlock, flags);
nsecs = os_nsecs();
nsecs += local_offset;
spin_unlock_irqrestore(&timer_spinlock, flags);
return nsecs;
}
void timer_irq(union uml_pt_regs *regs)
{
unsigned long long ticks = 0;
if(!timer_irq_inited){
/* This is to ensure that ticks don't pile up when
* the timer handler is suspended */
first_tick = 0;
return;
}
if(first_tick){
#ifdef CONFIG_UML_REAL_TIME_CLOCK
/* We've had 1 tick */
unsigned long long nsecs = os_nsecs();
delta += nsecs - prev_nsecs;
prev_nsecs = nsecs;
/* Protect against the host clock being set backwards */
if(delta < 0)
delta = 0;
ticks += (delta * HZ) / BILLION;
delta -= (ticks * BILLION) / HZ;
#else
ticks = 1;
#endif
}
else {
prev_nsecs = os_nsecs();
first_tick = 1;
}
while(ticks > 0){
do_IRQ(TIMER_IRQ, regs);
ticks--;
}
}
void __init time_init(void)
{
long long nsecs;
timer_init();
nsecs = os_nsecs();
set_normalized_timespec(&wall_to_monotonic, -nsecs / NSEC_PER_SEC,
-nsecs % NSEC_PER_SEC);
set_normalized_timespec(&xtime, nsecs / NSEC_PER_SEC,
nsecs % NSEC_PER_SEC);
late_time_init = setup_itimer;
}
static cycle_t itimer_read(struct clocksource *cs)
{
return os_nsecs() / 1000;
}
static u64 timer_read(struct clocksource *cs)
{
return os_nsecs() / TIMER_MULTIPLIER;
}
static cycle_t itimer_read(void)
{
return os_nsecs();
}
