296 lines
8.0 KiB
C
296 lines
8.0 KiB
C
/****************************************************************************
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* sched/clock/clock_timekeeping.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_CLOCK_TIMEKEEPING
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#include <sys/time.h>
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#include <stdint.h>
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#include <time.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include "clock/clock.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define NTP_MAX_ADJUST 500
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static struct timespec g_clock_wall_time;
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static uint64_t g_clock_last_counter;
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static uint64_t g_clock_mask;
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static long g_clock_adjust;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: clock_get_current_time
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****************************************************************************/
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static int clock_get_current_time(FAR struct timespec *ts,
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FAR struct timespec *base)
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{
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irqstate_t flags;
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uint64_t counter;
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uint64_t offset;
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uint64_t nsec;
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time_t sec;
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int ret;
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flags = enter_critical_section();
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ret = up_timer_gettick(&counter);
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if (ret < 0)
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{
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goto errout_in_critical_section;
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}
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offset = (counter - g_clock_last_counter) & g_clock_mask;
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nsec = offset * NSEC_PER_TICK;
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sec = nsec / NSEC_PER_SEC;
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nsec -= sec * NSEC_PER_SEC;
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nsec += base->tv_nsec;
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if (nsec >= NSEC_PER_SEC)
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{
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nsec -= NSEC_PER_SEC;
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sec += 1;
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}
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ts->tv_nsec = nsec;
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ts->tv_sec = base->tv_sec + sec;
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errout_in_critical_section:
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leave_critical_section(flags);
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: clock_timekeeping_get_wall_time
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****************************************************************************/
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int clock_timekeeping_get_wall_time(FAR struct timespec *ts)
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{
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return clock_get_current_time(ts, &g_clock_wall_time);
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}
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/****************************************************************************
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* Name: clock_timekeeping_set_wall_time
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****************************************************************************/
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int clock_timekeeping_set_wall_time(FAR const struct timespec *ts)
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{
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irqstate_t flags;
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uint64_t counter;
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int ret;
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flags = enter_critical_section();
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ret = up_timer_gettick(&counter);
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if (ret < 0)
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{
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goto errout_in_critical_section;
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}
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memcpy(&g_clock_wall_time, ts, sizeof(struct timespec));
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g_clock_adjust = 0;
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g_clock_last_counter = counter;
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errout_in_critical_section:
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leave_critical_section(flags);
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return ret;
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}
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/****************************************************************************
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* Name: adjtime
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*
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* Description:
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* The adjtime() function gradually adjusts the system clock (as returned
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* by gettimeofday(2)). The amount of time by which the clock is to be
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* adjusted is specified in the structure pointed to by delta.
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*
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* This structure has the following form:
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*
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* struct timeval
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* {
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* time_t tv_sec; (seconds)
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* suseconds_t tv_usec; (microseconds)
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* };
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*
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* If the adjustment in delta is positive, then the system clock is
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* speeded up by some small percentage (i.e., by adding a small amount of
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* time to the clock value in each second) until the adjustment has been
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* completed. If the adjustment in delta is negative, then the clock is
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* slowed down in a similar fashion.
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*
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* If a clock adjustment from an earlier adjtime() call is already in
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* progress at the time of a later adjtime() call, and delta is not NULL
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* for the later call, then the earlier adjustment is stopped, but any
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* already completed part of that adjustment is not undone.
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*
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* If olddelta is not NULL, then the buffer that it points to is used to
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* return the amount of time remaining from any previous adjustment that
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* has not yet been completed.
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*
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* NOTE: This is not a POSIX interface but derives from 4.3BSD, System V.
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* It is also supported for Linux compatibility.
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*
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****************************************************************************/
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int adjtime(FAR const struct timeval *delta, FAR struct timeval *olddelta)
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{
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irqstate_t flags;
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long adjust_usec;
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if (!delta)
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{
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set_errno(EINVAL);
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return -1;
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}
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flags = enter_critical_section();
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adjust_usec = delta->tv_sec * USEC_PER_SEC + delta->tv_usec;
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if (olddelta)
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{
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olddelta->tv_usec = g_clock_adjust;
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}
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g_clock_adjust = adjust_usec;
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leave_critical_section(flags);
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return OK;
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}
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/****************************************************************************
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* Name: clock_update_wall_time
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****************************************************************************/
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void clock_update_wall_time(void)
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{
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irqstate_t flags;
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uint64_t counter;
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uint64_t offset;
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int64_t nsec;
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time_t sec;
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int ret;
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flags = enter_critical_section();
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ret = up_timer_gettick(&counter);
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if (ret < 0)
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{
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goto errout_in_critical_section;
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}
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offset = (counter - g_clock_last_counter) & g_clock_mask;
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if (offset == 0)
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{
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goto errout_in_critical_section;
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}
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nsec = offset * NSEC_PER_TICK;
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sec = nsec / NSEC_PER_SEC;
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nsec -= sec * NSEC_PER_SEC;
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nsec += g_clock_wall_time.tv_nsec;
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if (nsec >= NSEC_PER_SEC)
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{
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nsec -= NSEC_PER_SEC;
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sec += 1;
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}
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if (g_clock_adjust != 0 && sec > 0)
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{
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long adjust = NTP_MAX_ADJUST * (long)sec;
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if (g_clock_adjust < adjust && g_clock_adjust > -adjust)
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{
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adjust = g_clock_adjust;
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}
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nsec += adjust * NSEC_PER_USEC;
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while (nsec < 0)
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{
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nsec += NSEC_PER_SEC;
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sec -= 1;
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}
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while (nsec >= NSEC_PER_SEC)
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{
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nsec -= NSEC_PER_SEC;
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sec += 1;
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}
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}
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g_clock_wall_time.tv_sec += sec;
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g_clock_wall_time.tv_nsec = (long)nsec;
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g_clock_last_counter = counter;
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errout_in_critical_section:
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leave_critical_section(flags);
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}
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/****************************************************************************
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* Name: clock_inittimekeeping
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****************************************************************************/
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void clock_inittimekeeping(FAR const struct timespec *tp)
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{
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up_timer_getmask(&g_clock_mask);
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if (tp)
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{
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memcpy(&g_clock_wall_time, tp, sizeof(struct timespec));
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}
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else
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{
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clock_basetime(&g_clock_wall_time);
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}
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up_timer_gettick(&g_clock_last_counter);
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}
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#endif /* CONFIG_CLOCK_TIMEKEEPING */
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