minix/lib/libsys/arch/earm/tsc_util.c

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#include <stdio.h>
#include <time.h>
#include <sys/times.h>
#include <sys/types.h>
#include <minix/u64.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/minlib.h>
#include <machine/archtypes.h>
#include "sysutil.h"
#ifndef CONFIG_MAX_CPUS
#define CONFIG_MAX_CPUS 1
#endif
#define MICROHZ 1000000 /* number of micros per second */
#define MICROSPERTICK(h) (MICROHZ/(h)) /* number of micros per HZ tick */
static u32_t calib_hz = 600000000;
u32_t tsc_64_to_micros(u64_t tsc)
{
u64_t tmp;
tmp = tsc / calib_hz;
return (u32_t) tmp;
}
u32_t tsc_to_micros(u32_t low, u32_t high)
{
return tsc_64_to_micros(make64(low, high));
}