mlib.h

/*
 * Copyright (C) 2018 Universita' di Pisa
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef __MLIB_H__
#define __MLIB_H__

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>

void tsc_init(void);
uint64_t ns2tsc(uint64_t ns);
uint64_t tsc2ns(uint64_t tsc);

static inline uint64_t
rdtsc(void)
{
    uint32_t hi, lo;
    __asm__ __volatile__("rdtsc" : "=a"(lo), "=d"(hi));
    return (uint64_t)lo | ((uint64_t)hi << 32);
}

static inline void
tsc_sleep_till(uint64_t when)
{
    while (rdtsc() < when) {
        /* compiler_barrier() */
        asm volatile("" ::: "memory");
    }
}

void runon(const char *prefix, int cpuid);

#ifdef __cplusplus
}
#endif

#endif /* __MLIB_H__ */