Nucleus

/*
 * This file controls the system clock and contains the functions related to
 * getting and setting the time from various sources.  It keeps a monotonic
 * clock internally, but can also make use of the tasks' clocks, and the RTC.
 */

#include <stdint.h>
#include <nucleus/cpu.h>
#include <nucleus/task.h>

uint32_t monotonic = 0;
uint8_t slice[MAX_CPUS] = {0};

/* Timer interrupt */
void
timer_handler(struct InterruptFrame *frame)
{
	monotonic++;

	/* Account timeslices */
	slice[CPUID]++;
	if (!current)
		return;

	/* Call scheduler */
	if (slice[CPUID] < current->priority)
		return;
	slice[CPUID] = 0;
	schedule();
}