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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSImpl
*
* @brief This source file contains a implementation of the counter value
* conversion functions.
*/
/*
* Copyright (C) 2014, 2018 embedded brains GmbH & Co. KG
*
* 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.
*
* 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.
*/
#include <rtems/counter.h>
#include <rtems/sysinit.h>
RTEMS_STATIC_ASSERT(sizeof(rtems_counter_ticks) <= sizeof(uint32_t), type);
static uint64_t to_ns_scaler;
static uint64_t from_ns_scaler;
static uint64_t to_sbt_scaler;
static uint64_t from_sbt_scaler;
uint64_t rtems_counter_ticks_to_nanoseconds( rtems_counter_ticks ticks )
{
return (uint32_t) ((ticks * to_ns_scaler) >> 32);
}
rtems_counter_ticks rtems_counter_nanoseconds_to_ticks( uint32_t nanoseconds )
{
return (rtems_counter_ticks) ((nanoseconds * from_ns_scaler) >> 32);
}
int64_t rtems_counter_ticks_to_sbintime( rtems_counter_ticks ticks )
{
return (int64_t) ((ticks * to_sbt_scaler) >> 31);
}
rtems_counter_ticks rtems_counter_sbintime_to_ticks( int64_t sbt )
{
return (rtems_counter_ticks) (((uint64_t) sbt * from_sbt_scaler) >> 32);
}
void rtems_counter_initialize_converter( uint32_t frequency )
{
uint64_t ns_per_s = UINT64_C(1000000000);
uint64_t bin_per_s = UINT64_C(1) << 32;
uint64_t bin_freq = (uint64_t) frequency << 32;
to_ns_scaler = ((ns_per_s << 32) + frequency - 1) / frequency;
from_ns_scaler = (bin_freq + ns_per_s - 1) / ns_per_s;
to_sbt_scaler = ((bin_per_s << 31) + frequency - 1) / frequency;
from_sbt_scaler = (bin_freq + bin_per_s - 1) / bin_per_s;
}
static void rtems_counter_sysinit( void )
{
rtems_counter_initialize_converter( rtems_counter_frequency() );
}
RTEMS_SYSINIT_ITEM(
rtems_counter_sysinit,
RTEMS_SYSINIT_CPU_COUNTER,
RTEMS_SYSINIT_ORDER_LAST_BUT_5
);
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