score/src/objectgetlocal.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSScoreObject
0007  *
0008  * @brief This source file contains the implementation of
0009  *   _Objects_Get().
0010  */
0011
0012 /*
0013  * Copyright (c) 2016 embedded brains GmbH & Co. KG
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <rtems/score/objectimpl.h>
0042
0043 Objects_Control *_Objects_Get(
0044   Objects_Id                 id,
0045   ISR_lock_Context          *lock_context,
0046   const Objects_Information *information
0047 )
0048 {
0049   Objects_Id delta;
0050   Objects_Id maximum_id;
0051   Objects_Id end;
0052
0053   maximum_id = information->maximum_id;
0054   delta = maximum_id - id;
0055   end = _Objects_Get_index( maximum_id );
0056
0057   if ( RTEMS_PREDICT_TRUE( delta < end ) ) {
0058     ISR_Level        level;
0059     Objects_Control *the_object;
0060
0061     _ISR_Local_disable( level );
0062     _ISR_lock_Context_set_level( lock_context, level );
0063
0064     the_object =
0065       information->local_table[ end - OBJECTS_INDEX_MINIMUM - delta ];
0066     if ( RTEMS_PREDICT_TRUE( the_object != NULL ) ) {
0067       /* ISR disabled on behalf of caller */
0068       return the_object;
0069     }
0070
0071     _ISR_Local_enable( level );
0072   }
0073
0074   return NULL;
0075 }