mirror of https://github.com/F-Stack/f-stack.git
100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2010-2014 Intel Corporation
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*/
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include <time.h>
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#include <errno.h>
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#include <rte_common.h>
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#include <rte_compat.h>
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#include <rte_log.h>
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#include <rte_cycles.h>
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#include <rte_pause.h>
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#include "eal_private.h"
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/* The frequency of the RDTSC timer resolution */
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static uint64_t eal_tsc_resolution_hz;
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/* Pointer to user delay function */
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void (*rte_delay_us)(unsigned int) = NULL;
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void
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rte_delay_us_block(unsigned int us)
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{
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const uint64_t start = rte_get_timer_cycles();
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const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6;
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while ((rte_get_timer_cycles() - start) < ticks)
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rte_pause();
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}
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void __rte_experimental
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rte_delay_us_sleep(unsigned int us)
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{
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struct timespec wait[2];
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int ind = 0;
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wait[0].tv_sec = 0;
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if (us >= US_PER_S) {
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wait[0].tv_sec = us / US_PER_S;
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us -= wait[0].tv_sec * US_PER_S;
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}
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wait[0].tv_nsec = 1000 * us;
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while (nanosleep(&wait[ind], &wait[1 - ind]) && errno == EINTR) {
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/*
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* Sleep was interrupted. Flip the index, so the 'remainder'
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* will become the 'request' for a next call.
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*/
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ind = 1 - ind;
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}
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}
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uint64_t
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rte_get_tsc_hz(void)
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{
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return eal_tsc_resolution_hz;
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}
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static uint64_t
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estimate_tsc_freq(void)
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{
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RTE_LOG(WARNING, EAL, "WARNING: TSC frequency estimated roughly"
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" - clock timings may be less accurate.\n");
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/* assume that the sleep(1) will sleep for 1 second */
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uint64_t start = rte_rdtsc();
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sleep(1);
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return rte_rdtsc() - start;
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}
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void
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set_tsc_freq(void)
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{
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uint64_t freq;
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freq = get_tsc_freq_arch();
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if (!freq)
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freq = get_tsc_freq();
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if (!freq)
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freq = estimate_tsc_freq();
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RTE_LOG(DEBUG, EAL, "TSC frequency is ~%" PRIu64 " KHz\n", freq / 1000);
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eal_tsc_resolution_hz = freq;
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}
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void rte_delay_us_callback_register(void (*userfunc)(unsigned int))
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{
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rte_delay_us = userfunc;
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}
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RTE_INIT(rte_timer_init)
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{
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/* set rte_delay_us_block as a delay function */
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rte_delay_us_callback_register(rte_delay_us_block);
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}
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