1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup RTEMSScoreProcessorMask |
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7 | * |
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8 | * @brief This source file contains the definition of |
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9 | * ::_Processor_mask_The_one_and_only and the implementation of |
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10 | * _Processor_mask_Copy(). |
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11 | */ |
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12 | |
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13 | /* |
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14 | * Copyright (c) 2017 embedded brains GmbH. All rights reserved. |
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15 | * |
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16 | * embedded brains GmbH |
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17 | * Dornierstr. 4 |
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18 | * 82178 Puchheim |
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19 | * Germany |
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20 | * <rtems@embedded-brains.de> |
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21 | * |
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22 | * Redistribution and use in source and binary forms, with or without |
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23 | * modification, are permitted provided that the following conditions |
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24 | * are met: |
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25 | * 1. Redistributions of source code must retain the above copyright |
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26 | * notice, this list of conditions and the following disclaimer. |
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27 | * 2. Redistributions in binary form must reproduce the above copyright |
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28 | * notice, this list of conditions and the following disclaimer in the |
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29 | * documentation and/or other materials provided with the distribution. |
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30 | * |
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31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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32 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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33 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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34 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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35 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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36 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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37 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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38 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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39 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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40 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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41 | * POSSIBILITY OF SUCH DAMAGE. |
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42 | */ |
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43 | |
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44 | #ifdef HAVE_CONFIG_H |
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45 | #include "config.h" |
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46 | #endif |
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47 | |
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48 | #include <rtems/score/processormask.h> |
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49 | |
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50 | const Processor_mask _Processor_mask_The_one_and_only = { .__bits[ 0 ] = 1 }; |
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51 | |
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52 | Processor_mask_Copy_status _Processor_mask_Copy( |
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53 | long *dst, |
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54 | size_t dst_size, |
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55 | const long *src, |
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56 | size_t src_size |
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57 | ) |
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58 | { |
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59 | long inclusive = 0; |
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60 | long exclusive = 0; |
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61 | |
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62 | if ( ( dst_size | src_size ) % sizeof( long ) != 0 ) { |
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63 | return PROCESSOR_MASK_COPY_INVALID_SIZE; |
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64 | } |
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65 | |
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66 | while ( dst_size > 0 && src_size > 0 ) { |
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67 | long bits = *src; |
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68 | |
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69 | inclusive |= bits; |
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70 | *dst = bits; |
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71 | ++dst; |
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72 | ++src; |
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73 | dst_size -= sizeof( long ); |
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74 | src_size -= sizeof( long ); |
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75 | } |
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76 | |
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77 | while ( dst_size > 0 ) { |
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78 | *dst = 0; |
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79 | ++dst; |
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80 | dst_size -= sizeof( long ); |
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81 | } |
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82 | |
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83 | while ( src_size > 0 ) { |
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84 | exclusive |= *src; |
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85 | ++src; |
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86 | src_size -= sizeof( long ); |
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87 | } |
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88 | |
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89 | if ( exclusive != 0 ) { |
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90 | if ( inclusive != 0 ) { |
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91 | return PROCESSOR_MASK_COPY_PARTIAL_LOSS; |
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92 | } else { |
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93 | return PROCESSOR_MASK_COPY_COMPLETE_LOSS; |
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94 | } |
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95 | } |
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96 | |
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97 | return PROCESSOR_MASK_COPY_LOSSLESS; |
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98 | } |
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