score/src/processormaskcopy.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSScoreProcessorMask
0007  *
0008  * @brief This source file contains the definition of
0009  *   ::_Processor_mask_The_one_and_only and the implementation of
0010  *   _Processor_mask_Copy().
0011  */
0012
0013 /*
0014  * Copyright (c) 2017 embedded brains GmbH & Co. KG
0015  *
0016  * Redistribution and use in source and binary forms, with or without
0017  * modification, are permitted provided that the following conditions
0018  * are met:
0019  * 1. Redistributions of source code must retain the above copyright
0020  *    notice, this list of conditions and the following disclaimer.
0021  * 2. Redistributions in binary form must reproduce the above copyright
0022  *    notice, this list of conditions and the following disclaimer in the
0023  *    documentation and/or other materials provided with the distribution.
0024  *
0025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0035  * POSSIBILITY OF SUCH DAMAGE.
0036  */
0037
0038 #ifdef HAVE_CONFIG_H
0039 #include "config.h"
0040 #endif
0041
0042 #include <rtems/score/processormaskimpl.h>
0043
0044 const Processor_mask _Processor_mask_The_one_and_only = { .__bits[ 0 ] = 1 };
0045
0046 Processor_mask_Copy_status _Processor_mask_Copy(
0047   long       *dst,
0048   size_t      dst_size,
0049   const long *src,
0050   size_t      src_size
0051 )
0052 {
0053   long inclusive = 0;
0054   long exclusive = 0;
0055
0056   if ( ( dst_size | src_size ) % sizeof( long ) != 0 ) {
0057     return PROCESSOR_MASK_COPY_INVALID_SIZE;
0058   }
0059
0060   while ( dst_size > 0 && src_size > 0 ) {
0061     long bits = *src;
0062
0063     inclusive |= bits;
0064     *dst = bits;
0065     ++dst;
0066     ++src;
0067     dst_size -= sizeof( long );
0068     src_size -= sizeof( long );
0069   }
0070
0071   while ( dst_size > 0 ) {
0072     *dst = 0;
0073     ++dst;
0074     dst_size -= sizeof( long );
0075   }
0076
0077   while ( src_size > 0 ) {
0078     exclusive |= *src;
0079     ++src;
0080     src_size -= sizeof( long );
0081   }
0082
0083   if ( exclusive != 0 ) {
0084     if ( inclusive != 0 ) {
0085       return PROCESSOR_MASK_COPY_PARTIAL_LOSS;
0086     } else {
0087       return PROCESSOR_MASK_COPY_COMPLETE_LOSS;
0088     }
0089   }
0090
0091   return PROCESSOR_MASK_COPY_LOSSLESS;
0092 }