#include	"u.h"
#include	"../port/lib.h"
#include	"mem.h"
#include	"dat.h"
#include	"fns.h"
#include	"io.h"

#include	"ureg.h"

/*
 *  delay for l milliseconds more or less.  delayloop is set by
 *  clockinit() to match the actual CPU speed.
 */
void
delay(int l)
{
	ulong i, j;

	j = m->delayloop;
	while(l-- > 0)
		for(i=0; i < j; i++)
			;
}

void
clockinit(void)
{
	long x;

	m->delayloop = m->speed*100;
	do {
		x = rdcount();
		delay(10);
		x = rdcount() - x;
	} while(x < 0);

	/*
	 *  fix count
	 */
	m->delayloop = (m->delayloop*m->speed*1000*10)/x;
	if(m->delayloop == 0)
		m->delayloop = 1;

	wrcompare(rdcount()+(m->speed*1000000)/HZ);
}

void
clock(Ureg *ur)
{
	wrcompare(rdcount()+(m->speed*1000000)/HZ);

	m->ticks++;
	if(m->proc)
		m->proc->pc = ur->pc;

	accounttime();

	ifjab();

	kproftimer(ur->pc);

	kmapinval();

	if((active.machs&(1<<m->machno)) == 0)
		return;

	if(active.exiting && (active.machs & (1<<m->machno))) {
		print("someone's exiting\n");
		exit(0);
	}

	checkalarms();
	uartclock();
	mouseclock();
	randomclock();

	if(up == 0 || up->state != Running)
		return;

	if(anyready())
		sched();

	/* user profiling clock */
	if(ur->status & KUSER) {
		(*(ulong*)(USTKTOP-BY2WD)) += TK2MS(1);
		segclock(ur->pc);
	}
}