1 | /* |
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2 | * Copyright (c) 2011 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Obere Lagerstr. 30 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #ifdef HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <rtems/score/nios2-utility.h> |
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20 | |
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21 | static bool _Nios2_MPU_Is_region_disabled( |
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22 | const Nios2_MPU_Configuration *config, |
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23 | uint32_t mpubase, |
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24 | uint32_t mpuacc |
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25 | ) |
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26 | { |
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27 | bool disabled = false; |
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28 | |
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29 | if ( config->region_uses_limit ) { |
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30 | disabled = (mpubase & NIOS2_MPUBASE_BASE_MASK) |
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31 | > (mpuacc & NIOS2_MPUACC_LIMIT_MASK); |
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32 | } else { |
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33 | disabled = (mpuacc & NIOS2_MPUACC_MASK_MASK) == 0; |
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34 | } |
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35 | |
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36 | return disabled; |
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37 | } |
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38 | |
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39 | int _Nios2_MPU_Get_disabled_region_index( |
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40 | const Nios2_MPU_Configuration *config, |
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41 | bool data, |
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42 | int begin, |
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43 | int end |
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44 | ) |
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45 | { |
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46 | int index = -1; |
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47 | int count = _Nios2_MPU_Get_region_count( config, data ); |
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48 | |
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49 | if ( end < 0 || count < end ) { |
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50 | end = count; |
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51 | } |
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52 | |
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53 | if ( begin >= 0 ) { |
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54 | int i = 0; |
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55 | |
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56 | for ( i = begin; i < end && index < 0; ++i ) { |
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57 | uint32_t mpubase = 0; |
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58 | uint32_t mpuacc = 0; |
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59 | |
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60 | _Nios2_MPU_Get_region_registers( i, data, &mpubase, &mpuacc ); |
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61 | |
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62 | if ( _Nios2_MPU_Is_region_disabled( config, mpubase, mpuacc ) ) { |
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63 | index = i; |
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64 | } |
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65 | } |
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66 | } |
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67 | |
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68 | return index; |
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69 | } |
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70 | |
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71 | bool _Nios2_MPU_Add_region( |
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72 | const Nios2_MPU_Configuration *config, |
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73 | const Nios2_MPU_Region_descriptor *desc, |
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74 | bool force |
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75 | ) |
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76 | { |
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77 | bool ok = true; |
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78 | int index = desc->index; |
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79 | bool data = desc->data; |
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80 | uint32_t mpubase = 0; |
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81 | uint32_t mpuacc = 0; |
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82 | |
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83 | if ( _Nios2_MPU_Is_valid_index( config, index, data ) ) { |
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84 | if ( !force ) { |
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85 | _Nios2_MPU_Get_region_registers( index, data, &mpubase, &mpuacc ); |
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86 | ok = _Nios2_MPU_Is_region_disabled( config, mpubase, mpuacc ); |
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87 | } |
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88 | |
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89 | if ( ok ) { |
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90 | ok = _Nios2_MPU_Setup_region_registers( |
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91 | config, |
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92 | desc, |
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93 | &mpubase, |
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94 | &mpuacc |
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95 | ); |
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96 | if ( ok ) { |
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97 | _Nios2_Set_ctlreg_mpubase(mpubase); |
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98 | _Nios2_Set_ctlreg_mpuacc(mpuacc); |
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99 | } |
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100 | } |
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101 | } else { |
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102 | ok = false; |
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103 | } |
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104 | |
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105 | return ok; |
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106 | } |
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