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 RTEMSScoreCPUARMPMSAv8 |
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7 | * |
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8 | * @brief This source file contains the implementation of |
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9 | * _AArch32_PMSA_Initialize(). |
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10 | */ |
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11 | |
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12 | /* |
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13 | * Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de) |
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14 | * |
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15 | * Redistribution and use in source and binary forms, with or without |
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16 | * modification, are permitted provided that the following conditions |
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17 | * are met: |
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18 | * 1. Redistributions of source code must retain the above copyright |
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19 | * notice, this list of conditions and the following disclaimer. |
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20 | * 2. Redistributions in binary form must reproduce the above copyright |
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21 | * notice, this list of conditions and the following disclaimer in the |
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22 | * documentation and/or other materials provided with the distribution. |
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23 | * |
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24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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34 | * POSSIBILITY OF SUCH DAMAGE. |
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35 | */ |
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36 | |
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37 | #ifdef HAVE_CONFIG_H |
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38 | #include "config.h" |
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39 | #endif |
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40 | |
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41 | #include <rtems/score/aarch32-pmsa.h> |
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42 | |
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43 | #if __ARM_ARCH >= 8 && __ARM_ARCH_PROFILE == 'R' |
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44 | |
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45 | #include <rtems/score/aarch32-system-registers.h> |
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46 | #include <rtems/score/cpu.h> |
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47 | |
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48 | #define AARCH32_PSMA_REGION_MAX \ |
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49 | ( ( AARCH32_MPUIR_REGION_MASK >> AARCH32_MPUIR_REGION_SHIFT ) + 1 ) |
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50 | |
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51 | typedef struct { |
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52 | uint32_t base; |
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53 | uint32_t limit; |
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54 | uint32_t attributes; |
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55 | } AArch32_PMSA_Region; |
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56 | |
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57 | static void _AArch32_PMSA_Configure( |
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58 | const AArch32_PMSA_Region *regions, |
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59 | size_t region_used, |
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60 | size_t region_max |
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61 | ) |
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62 | { |
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63 | size_t ri; |
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64 | uint32_t sctlr; |
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65 | |
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66 | for ( ri = 0 ; ri < region_used; ++ri ) { |
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67 | uint32_t prbar; |
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68 | uint32_t prlar; |
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69 | uint32_t attr; |
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70 | |
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71 | prbar = regions[ ri ].base; |
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72 | prlar = regions[ ri ].limit; |
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73 | attr = regions[ ri ].attributes; |
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74 | |
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75 | prbar |= ( attr >> 6 ) & 0x3fU; |
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76 | prlar |= attr & 0x3fU; |
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77 | |
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78 | _AArch32_Write_prselr( ri ); |
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79 | _ARM_Instruction_synchronization_barrier(); |
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80 | _AArch32_Write_prbar( prbar ); |
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81 | _AArch32_Write_prlar( prlar ); |
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82 | } |
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83 | |
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84 | for ( ri = region_used ; ri < region_max; ++ri ) { |
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85 | _AArch32_Write_prselr( ri ); |
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86 | _ARM_Instruction_synchronization_barrier(); |
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87 | _AArch32_Write_prbar( 0 ); |
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88 | _AArch32_Write_prlar( 0 ); |
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89 | } |
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90 | |
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91 | _ARM_Data_synchronization_barrier(); |
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92 | sctlr = _AArch32_Read_sctlr(); |
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93 | sctlr |= AARCH32_SCTLR_M | AARCH32_SCTLR_I | AARCH32_SCTLR_C; |
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94 | sctlr &= ~AARCH32_SCTLR_BR; |
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95 | _AArch32_Write_sctlr( sctlr ); |
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96 | _ARM_Instruction_synchronization_barrier(); |
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97 | } |
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98 | |
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99 | void _AArch32_PMSA_Initialize( |
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100 | uint32_t memory_attributes_0, |
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101 | uint32_t memory_attributes_1, |
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102 | const AArch32_PMSA_Section *sections, |
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103 | size_t section_count |
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104 | ) |
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105 | { |
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106 | AArch32_PMSA_Region regions[ AARCH32_PSMA_REGION_MAX ]; |
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107 | size_t ri; |
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108 | size_t si; |
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109 | size_t region_used; |
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110 | size_t region_max; |
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111 | |
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112 | _AArch32_Write_mair0( memory_attributes_0 ); |
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113 | _AArch32_Write_mair1( memory_attributes_1 ); |
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114 | |
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115 | region_max = ( _AArch32_Read_mpuir() & AARCH32_MPUIR_REGION_MASK ) >> |
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116 | AARCH32_MPUIR_REGION_SHIFT; |
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117 | region_used = 0; |
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118 | |
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119 | for ( si = 0; si < section_count; ++si ) { |
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120 | uint32_t base; |
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121 | uint32_t limit; |
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122 | uint32_t attr; |
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123 | |
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124 | base = sections[ si ].begin; |
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125 | limit = sections[ si ].end; |
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126 | attr = sections[ si ].attributes; |
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127 | |
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128 | if ( base == limit ) { |
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129 | continue; |
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130 | } |
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131 | |
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132 | base = RTEMS_ALIGN_DOWN( base, AARCH32_PMSA_MIN_REGION_ALIGN ); |
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133 | limit = RTEMS_ALIGN_DOWN( limit - 1, AARCH32_PMSA_MIN_REGION_ALIGN ); |
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134 | |
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135 | for ( ri = 0; ri < region_used; ++ri ) { |
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136 | uint32_t region_base; |
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137 | uint32_t region_limit; |
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138 | uint32_t region_attr; |
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139 | |
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140 | region_base = regions[ ri ].base; |
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141 | region_limit = regions[ ri ].limit; |
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142 | region_attr = regions[ ri ].attributes; |
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143 | |
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144 | if ( |
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145 | limit + AARCH32_PMSA_MIN_REGION_ALIGN == region_base && |
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146 | attr == region_attr |
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147 | ) { |
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148 | /* Merge section with existing region */ |
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149 | regions[ ri ].base = base; |
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150 | break; |
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151 | } else if ( |
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152 | base == region_limit + AARCH32_PMSA_MIN_REGION_ALIGN && |
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153 | attr == region_attr |
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154 | ) { |
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155 | /* Merge section with existing region */ |
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156 | regions[ ri ].limit = limit; |
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157 | break; |
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158 | } else if ( limit < region_base ) { |
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159 | size_t i; |
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160 | |
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161 | if ( region_used >= region_max ) { |
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162 | return; |
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163 | } |
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164 | |
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165 | for ( i = ri; i < region_used; ++i ) { |
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166 | regions[ i + 1 ] = regions[ i ]; |
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167 | } |
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168 | |
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169 | /* New first region */ |
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170 | ++region_used; |
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171 | regions[ ri ].base = base; |
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172 | regions[ ri ].limit = limit; |
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173 | regions[ ri ].attributes = attr; |
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174 | break; |
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175 | } |
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176 | } |
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177 | |
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178 | if ( ri == region_used ) { |
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179 | if ( region_used >= region_max ) { |
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180 | return; |
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181 | } |
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182 | |
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183 | /* New last region */ |
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184 | regions[ ri ].base = base; |
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185 | regions[ ri ].limit = limit; |
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186 | regions[ ri ].attributes = attr; |
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187 | ++region_used; |
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188 | } |
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189 | } |
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190 | |
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191 | _AArch32_PMSA_Configure( regions, region_used, region_max ); |
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192 | } |
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193 | |
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194 | #endif |
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