/*
* IRQ handler for the RTC (called twice a second)
*/
static void rtc_sys_tick(void* ctx) {
// Read the RTC register so IRQ will happen again
io_outb(0x70, 0x0C);
io_inb(0x71);
// Only increment time every second
if(tick++ == 2) {
tick = 0;
} else {
return;
}
// Increment seconds
if(time.second++ == 59) {
time.second = 0;
// Increment minutes
if(time.minute++ == 59) {
time.minute = 0;
// Resync with hardware every hour
rtc_read();
}
}
// Reseed PRNG
srand(irq_count());
// KDEBUG("%02u:%02u:%02u (%02u-%02u-%04u)", time.hour, time.minute, time.second, time.day, time.month, time.year);
}
static inline bool use_lazy_mmu_mode(void)
{
#ifdef CONFIG_PREEMPT
if (!preempt_count())
return false;
#endif
return !irq_count();
}
void vtime_account_system(struct task_struct *tsk)
{
struct thread_info *ti = task_thread_info(tsk);
__u64 stime = vtime_delta(tsk);
if ((tsk->flags & PF_VCPU) && !irq_count())
ti->gtime += stime;
else if (hardirq_count())
ti->hardirq_time += stime;
else if (in_serving_softirq())
ti->softirq_time += stime;
else
ti->stime += stime;
}
/*
* Account system cpu time to a process.
* @p: the process that the cpu time gets accounted to
* @hardirq_offset: the offset to subtract from hardirq_count()
* @cputime: the cpu time spent in kernel space since the last update
*/
void account_system_time(struct task_struct *p, int hardirq_offset, u64 cputime)
{
int index;
if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0)) {
account_guest_time(p, cputime);
return;
}
if (hardirq_count() - hardirq_offset)
index = CPUTIME_IRQ;
else if (in_serving_softirq())
index = CPUTIME_SOFTIRQ;
else
index = CPUTIME_SYSTEM;
account_system_index_time(p, cputime, index);
}
static void debug_kmap_atomic_prot(enum km_type type)
{
#ifdef CONFIG_DEBUG_HIGHMEM
static unsigned warn_count = 10;
if (unlikely(warn_count == 0))
return;
if (unlikely(in_interrupt())) {
if (in_irq()) {
if (type != KM_IRQ0 && type != KM_IRQ1 &&
type != KM_BIO_SRC_IRQ && type != KM_BIO_DST_IRQ &&
type != KM_BOUNCE_READ) {
WARN_ON(1);
warn_count--;
}
} else if (!irqs_disabled()) { /* softirq */
if (type != KM_IRQ0 && type != KM_IRQ1 &&
type != KM_SOFTIRQ0 && type != KM_SOFTIRQ1 &&
type != KM_SKB_SUNRPC_DATA &&
type != KM_SKB_DATA_SOFTIRQ &&
type != KM_BOUNCE_READ) {
WARN_ON(1);
warn_count--;
}
}
}
if (type == KM_IRQ0 || type == KM_IRQ1 || type == KM_BOUNCE_READ ||
type == KM_BIO_SRC_IRQ || type == KM_BIO_DST_IRQ) {
if (!irqs_disabled()) {
WARN_ON(1);
warn_count--;
}
} else if (type == KM_SOFTIRQ0 || type == KM_SOFTIRQ1) {
if (irq_count() == 0 && !irqs_disabled()) {
WARN_ON(1);
warn_count--;
}
}
#endif
}
/*
* Account a single tick of cpu time.
* @p: the process that the cpu time gets accounted to
* @user_tick: indicates if the tick is a user or a system tick
*/
void account_process_tick(struct task_struct *p, int user_tick)
{
cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
struct rq *rq = this_rq();
if (sched_clock_irqtime) {
irqtime_account_process_tick(p, user_tick, rq);
return;
}
if (steal_account_process_tick())
return;
if (user_tick)
account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
account_system_time(p, HARDIRQ_OFFSET, cputime_one_jiffy,
one_jiffy_scaled);
else
account_idle_time(cputime_one_jiffy);
}
/*
* Account time for a transition between system, hard irq or soft irq state.
* Note that this function is called with interrupts enabled.
*/
void account_system_vtime(struct task_struct *tsk)
{
struct thread_info *ti = task_thread_info(tsk);
unsigned long flags;
cputime_t delta_stime;
__u64 now;
local_irq_save(flags);
now = ia64_get_itc();
delta_stime = cycle_to_cputime(ti->ac_stime + (now - ti->ac_stamp));
if (irq_count() || idle_task(smp_processor_id()) != tsk)
account_system_time(tsk, 0, delta_stime, delta_stime);
else
account_idle_time(delta_stime);
ti->ac_stime = 0;
ti->ac_stamp = now;
local_irq_restore(flags);
}
static void __vtime_account_system(struct task_struct *tsk)
{
cputime_t delta_cpu = get_vtime_delta(tsk);
account_system_time(tsk, irq_count(), delta_cpu, cputime_to_scaled(delta_cpu));
}