shithub: riscv

ref: 1aa8352b43390f548da154b82b0b50e295d9c03f
dir: /sys/src/9/riscv64/clock.c/

View raw version 
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "ureg.h"
#include "sysreg.h"

/* Fixed tick frequency in QEMU */
static uvlong freq = 10000000;

extern uvlong rdtime(void);

void
clockinit(void)
{
}

void
timerset(uvlong next)
{
	// TODO
}

uvlong
fastticks(uvlong *hz)
{
	if(hz)
		*hz = freq;
	return rdtime();
}

ulong
µs(void)
{
	uvlong hz;
	uvlong t = fastticks(&hz);
	return (t * 1000000ULL) / hz;
}

void
microdelay(int n)
{
	ulong now;

	now = µs();
	while(µs() - now < n);
}

void
delay(int n)
{
	while(--n >= 0)
		microdelay(1000);
}