f-stack/dpdk/lib/librte_eal/bsdapp/eal/eal_timer.c

/*-
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 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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 *   modification, are permitted provided that the following conditions
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 *
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 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <errno.h>

#include <rte_common.h>
#include <rte_log.h>
#include <rte_cycles.h>
#include <rte_memory.h>
#include <rte_eal.h>
#include <rte_debug.h>

#include "eal_private.h"
#include "eal_internal_cfg.h"

#ifdef RTE_LIBEAL_USE_HPET
#warning HPET is not supported in FreeBSD
#endif

enum timer_source eal_timer_source = EAL_TIMER_TSC;

uint64_t
get_tsc_freq(void)
{
	size_t sz;
	int tmp;
	uint64_t tsc_hz;

	sz = sizeof(tmp);
	tmp = 0;

	if (sysctlbyname("kern.timecounter.smp_tsc", &tmp, &sz, NULL, 0))
		RTE_LOG(WARNING, EAL, "%s\n", strerror(errno));
	else if (tmp != 1)
		RTE_LOG(WARNING, EAL, "TSC is not safe to use in SMP mode\n");

	tmp = 0;

	if (sysctlbyname("kern.timecounter.invariant_tsc", &tmp, &sz, NULL, 0))
		RTE_LOG(WARNING, EAL, "%s\n", strerror(errno));
	else if (tmp != 1)
		RTE_LOG(WARNING, EAL, "TSC is not invariant\n");

	sz = sizeof(tsc_hz);
	if (sysctlbyname("machdep.tsc_freq", &tsc_hz, &sz, NULL, 0)) {
		RTE_LOG(WARNING, EAL, "%s\n", strerror(errno));
		return 0;
	}

	return tsc_hz;
}

int
rte_eal_timer_init(void)
{
	set_tsc_freq();
	return 0;
}