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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScorePerCPU
*
* @brief This source file contains the implementation of
* _Per_CPU_State_wait_for_non_initial_state().
*/
/*
* Copyright (c) 2014 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/percpu.h>
#include <rtems/counter.h>
bool _Per_CPU_State_wait_for_non_initial_state(
uint32_t cpu_index,
uint32_t timeout_in_ns
)
{
const Per_CPU_Control *cpu;
Per_CPU_State state;
cpu = _Per_CPU_Get_by_index( cpu_index );
state = _Per_CPU_Get_state( cpu );
if ( timeout_in_ns > 0 ) {
rtems_counter_ticks ticks =
rtems_counter_nanoseconds_to_ticks( timeout_in_ns );
rtems_counter_ticks a = rtems_counter_read();
rtems_counter_ticks delta = 0;
while ( ticks > delta && state == PER_CPU_STATE_INITIAL ) {
rtems_counter_ticks b;
state = _Per_CPU_Get_state( cpu );
ticks -= delta;
b = rtems_counter_read();
delta = rtems_counter_difference( b, a );
a = b;
}
} else {
while ( state == PER_CPU_STATE_INITIAL ) {
state = _Per_CPU_Get_state( cpu );
}
}
return state != PER_CPU_STATE_INITIAL;
}
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