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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/types.h>
#include <errno.h>
#include <rte_common.h>
#include <rte_log.h>
#include <rte_cycles.h>
#include <rte_pause.h>
#include "eal_private.h"
/* The frequency of the RDTSC timer resolution */
static uint64_t eal_tsc_resolution_hz;
/* Pointer to user delay function */
void (*rte_delay_us)(unsigned int) = NULL;
void
rte_delay_us_block(unsigned int us)
{
const uint64_t start = rte_get_timer_cycles();
const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6;
while ((rte_get_timer_cycles() - start) < ticks)
rte_pause();
}
uint64_t
rte_get_tsc_hz(void)
{
return eal_tsc_resolution_hz;
}
static uint64_t
estimate_tsc_freq(void)
{
RTE_LOG(WARNING, EAL, "WARNING: TSC frequency estimated roughly"
" - clock timings may be less accurate.\n");
/* assume that the sleep(1) will sleep for 1 second */
uint64_t start = rte_rdtsc();
sleep(1);
return rte_rdtsc() - start;
}
void
set_tsc_freq(void)
{
uint64_t freq;
freq = get_tsc_freq_arch();
if (!freq)
freq = get_tsc_freq();
if (!freq)
freq = estimate_tsc_freq();
RTE_LOG(DEBUG, EAL, "TSC frequency is ~%" PRIu64 " KHz\n", freq / 1000);
eal_tsc_resolution_hz = freq;
}
void rte_delay_us_callback_register(void (*userfunc)(unsigned int))
{
rte_delay_us = userfunc;
}
RTE_INIT(rte_timer_init)
{
/* set rte_delay_us_block as a delay function */
rte_delay_us_callback_register(rte_delay_us_block);
}
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