137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/****************************************************************************
|
|
* sched/clock/clock_systimer.c
|
|
*
|
|
* Copyright (C) 2011, 2014-2016 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* 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.
|
|
* 3. Neither the name NuttX nor the names of its 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
|
|
* "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
|
|
* COPYRIGHT OWNER 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <nuttx/irq.h>
|
|
#include <nuttx/arch.h>
|
|
#include <nuttx/clock.h>
|
|
|
|
#include "clock/clock.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
/* See nuttx/clock.h */
|
|
|
|
#undef clock_systimer
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: clock_systimer
|
|
*
|
|
* Description:
|
|
* Return the current value of the 32/64-bit system timer counter
|
|
*
|
|
* Parameters:
|
|
* None
|
|
*
|
|
* Return Value:
|
|
* The current value of the system timer counter
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
systime_t clock_systimer(void)
|
|
{
|
|
#ifdef CONFIG_SCHED_TICKLESS
|
|
# ifdef CONFIG_SYSTEM_TIME64
|
|
|
|
struct timespec ts;
|
|
|
|
/* Get the time from the platform specific hardware */
|
|
|
|
#ifndef CONFIG_CLOCK_TIMEKEEPING
|
|
(void)up_timer_gettime(&ts);
|
|
#else
|
|
(void)clock_timekeeping_get_monotonic_time(&ts);
|
|
#endif
|
|
|
|
/* Convert to a 64-bit value in microseconds, then in clock tick units */
|
|
|
|
return USEC2TICK(1000000 * (uint64_t)ts.tv_sec + (uint64_t)ts.tv_nsec / 1000);
|
|
|
|
# else /* CONFIG_SYSTEM_TIME64 */
|
|
|
|
struct timespec ts;
|
|
uint64_t tmp;
|
|
|
|
/* Get the time from the platform specific hardware */
|
|
|
|
#ifndef CONFIG_CLOCK_TIMEKEEPING
|
|
(void)up_timer_gettime(&ts);
|
|
#else
|
|
(void)clock_timekeeping_get_monotonic_time(&ts);
|
|
#endif
|
|
|
|
/* Convert to a 64- then a 32-bit value */
|
|
|
|
tmp = USEC2TICK(1000000 * (uint64_t)ts.tv_sec + (uint64_t)ts.tv_nsec / 1000);
|
|
return (systime_t)(tmp & 0x00000000ffffffff);
|
|
|
|
# endif /* CONFIG_SYSTEM_TIME64 */
|
|
#else /* CONFIG_SCHED_TICKLESS */
|
|
# ifdef CONFIG_SYSTEM_TIME64
|
|
|
|
irqstate_t flags;
|
|
systime_t sample;
|
|
|
|
/* 64-bit accesses are not atomic on most architectures. */
|
|
|
|
flags = enter_critical_section();
|
|
sample = g_system_timer;
|
|
leave_critical_section(flags);
|
|
return sample;
|
|
|
|
# else /* CONFIG_SYSTEM_TIME64 */
|
|
|
|
/* Return the current system time */
|
|
|
|
return g_system_timer;
|
|
|
|
# endif /* CONFIG_SYSTEM_TIME64 */
|
|
#endif /* CONFIG_SCHED_TICKLESS */
|
|
}
|