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#include "util/time.h"
#include "drivers/cmos.h"
#include "main/apic.h"
#include "proc/sched.h"
#include "util/printf.h"
#include "util/timer.h"
#include <drivers/screen.h>
#define TIME_APIC_TICK_FREQUENCY 16
// this is pretty wrong...
#define MICROSECONDS_PER_APIC_TICK (16 * 1000 / TIME_APIC_TICK_FREQUENCY)
volatile uint64_t jiffies;
uint64_t timer_tickcount CORE_SPECIFIC_DATA;
uint64_t kernel_preempted_count CORE_SPECIFIC_DATA;
uint64_t user_preempted_count CORE_SPECIFIC_DATA;
uint64_t not_preempted_count CORE_SPECIFIC_DATA;
uint64_t idle_count CORE_SPECIFIC_DATA;
// (freq / 16) interrupts per millisecond
static long timer_tick_handler(regs_t *regs)
{
timer_tickcount++;
#ifdef __VGABUF__
if (timer_tickcount % 128 == 0)
screen_flush();
#endif
if (curcore.kc_id == 0)
{
jiffies = timer_tickcount;
__timers_fire();
}
#ifdef __KPREEMPT__ // if (preemption_enabled()) {
(regs->r_cs & 0x3) ? user_preempted_count++ : kernel_preempted_count++;
apic_eoi();
if (regs->r_cs & 0x3 && curthr->kt_cancelled)
kthread_exit((void *)-1);
sched_yield();
return 1;
#endif
#ifndef __KPREEMPT__ //} else {
curthr ? not_preempted_count++ : idle_count++;
return 0;
#endif //}
return 0;
}
void time_init()
{
timer_tickcount = 0;
intr_register(INTR_APICTIMER, timer_tick_handler);
apic_enable_periodic_timer(TIME_APIC_TICK_FREQUENCY);
}
void time_spin(uint64_t ms)
{
uint64_t ticks_to_wait = ms * TIME_APIC_TICK_FREQUENCY / 16;
uint64_t target = timer_tickcount + ticks_to_wait;
dbg(DBG_SCHED, "spinning for %lu ms (%lu APIC ticks)\n", ms, ticks_to_wait);
while (timer_tickcount < target)
;
}
void time_sleep(uint64_t ms)
{
// TODO make curthr runnable and place on runqueue
time_spin(ms);
}
inline time_t core_uptime()
{
return (MICROSECONDS_PER_APIC_TICK * timer_tickcount) / 1000;
}
static int mdays[] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
time_t do_time()
{
rtc_time_t tm = rtc_get_time();
// dbg(DBG_SCHED, "rtc_time (Y-M-D:hh:mm:ss): %d-%d-%d:%d:%d:%d\n", tm.year,
// tm.month, tm.day, tm.hour, tm.minute, tm.second);
int yday = mdays[tm.month - 1] + tm.day - 1;
if (tm.month >= 3 && (((tm.year % 4 == 0) && (tm.year % 100 != 0)) ||
(tm.year % 400 == 0)))
{
yday += 1;
}
tm.year -= 1900;
/* oof */
time_t unix_time =
tm.second + tm.minute * 60 + tm.hour * 3600 + yday * 86400 +
(tm.year - 70) * 31536000 + ((tm.year - 69) / 4) * 86400 -
((tm.year - 1) / 100) * 86400 + ((tm.year + 299) / 400) * 86400;
return unix_time;
}
static size_t human_readable_format(char *buf, size_t size, uint64_t ticks)
{
uint64_t milliseconds = core_uptime();
uint64_t minutes = milliseconds / (60 * 1000);
milliseconds -= minutes * 60 * 1000;
uint64_t seconds = milliseconds / 1000;
milliseconds -= seconds * 1000;
return (size_t)snprintf(buf, size, "%lu min, %lu sec, %lu ms", minutes,
seconds, milliseconds);
}
static size_t percentage(char *buf, size_t size, uint64_t numerator,
uint64_t denominator)
{
// 2 decimal points, no floats
uint64_t new_numerator = numerator * 10000;
if (new_numerator < numerator)
{
return (size_t)snprintf(buf, size, "N/A");
}
uint64_t result = denominator ? new_numerator / denominator : 0;
return (size_t)snprintf(buf, size, "%lu.%02lu%%", result / 100,
result % 100);
}
size_t time_stats(char *buf, size_t len)
{
size_t off = 0;
off += snprintf(buf + off, len - off, "core uptime:\t");
off += human_readable_format(buf + off, len - off, timer_tickcount);
off += snprintf(buf + off, len - off, "\nidle time:\t");
off += human_readable_format(buf + off, len - off, idle_count);
off += snprintf(buf + off, len - off, "\t");
off += percentage(buf + off, len - off, idle_count, timer_tickcount);
KASSERT(not_preempted_count + user_preempted_count +
kernel_preempted_count + idle_count - timer_tickcount <=
2);
off += snprintf(buf + off, len - off, "\n\ntotal tick count = %lu",
timer_tickcount);
off += snprintf(buf + off, len - off, "\nidle count = %lu",
idle_count);
off += snprintf(buf + off, len - off, "\t");
off += percentage(buf + off, len - off, idle_count, timer_tickcount);
off += snprintf(buf + off, len - off, "\nkernel preempted count = %lu",
kernel_preempted_count);
off += snprintf(buf + off, len - off, "\t");
off += percentage(buf + off, len - off, kernel_preempted_count,
timer_tickcount);
off += snprintf(buf + off, len - off, "\nuser preempted count = %lu",
user_preempted_count);
off += snprintf(buf + off, len - off, "\t");
off +=
percentage(buf + off, len - off, user_preempted_count, timer_tickcount);
off += snprintf(buf + off, len - off, "\nnot preempted count = %lu",
not_preempted_count);
off += snprintf(buf + off, len - off, "\t");
off +=
percentage(buf + off, len - off, not_preempted_count, timer_tickcount);
return off;
}
static void do_wakeup(uint64_t arg)
{
kthread_t *thr = (kthread_t *)arg;
if (thr->kt_wchan)
{
sched_broadcast_on(thr->kt_wchan);
}
}
long do_usleep(useconds_t usec)
{
ktqueue_t waitq;
sched_queue_init(&waitq);
timer_t timer;
timer_init(&timer);
timer.function = do_wakeup;
timer.data = (uint64_t)curthr;
timer.expires = jiffies + (usec / MICROSECONDS_PER_APIC_TICK);
timer_add(&timer);
long ret = sched_cancellable_sleep_on(&waitq);
timer_del(&timer);
return ret;
}
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