1 | /* |
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2 | * SOCLIB_LGPL_HEADER_BEGIN |
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3 | * |
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4 | * This file is part of SoCLib, GNU LGPLv2.1. |
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5 | * |
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6 | * SoCLib is free software; you can redistribute it and/or modify it |
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7 | * under the terms of the GNU Lesser General Public License as published |
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8 | * by the Free Software Foundation; version 2.1 of the License. |
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9 | * |
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10 | * SoCLib is distributed in the hope that it will be useful, but |
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11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 | * Lesser General Public License for more details. |
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14 | * |
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15 | * You should have received a copy of the GNU Lesser General Public |
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16 | * License along with SoCLib; if not, write to the Free Software |
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17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 | * 02110-1301 USA |
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19 | * |
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20 | * SOCLIB_LGPL_HEADER_END |
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21 | * |
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22 | * Copyright (c) UPMC, Lip6, Asim |
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23 | Alain Greiner <alain.greiner@lip6.fr> 2005 |
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24 | * Nicolas Pouillon <nipo@ssji.net>, 2008 |
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25 | * |
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26 | * Maintainers: alain |
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27 | */ |
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28 | |
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29 | /////////////////////////////////////////////////////////////////////////// |
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30 | // Implementation Note : |
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31 | // This component is implemented as two independant combinational |
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32 | // crossbars, for VCI commands and VCI responses respectively. |
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33 | // - The CMD crossbar has NI local plus one global input |
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34 | // ports. It has NT local + one global output ports. |
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35 | // - The RSP crossbar has NT local plus one global input |
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36 | // ports. It has NI local + one global output ports. |
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37 | // For each generic crossbar, the input and output ports are impemented |
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38 | // as arrays of ports, and the last port (i.e. the largest index value) |
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39 | // is the port connected to the global interconnect. |
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40 | // |
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41 | // This component does not contain FIFOs, and behaves as a Mealy FSM. |
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42 | // |
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43 | // It supportsi single flit VCI broadcast commands : If the |
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44 | // two lsb bits of the VCI ADDRESS are non zero, the corresponding |
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45 | // command is considered as a broadcast. |
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46 | // For a broadcast, the single VCI flit is SEQUENCIALLY transmitted |
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47 | // to the (NT+1) output ports, but not to the requesting input port. |
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48 | // For each transmitted flit to a given output port, the standard |
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49 | // round-robin allocation policy is respected. |
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50 | // As the broadcast command arriving on input port (i) should not be |
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51 | // transmitted to the requester, it is not transmitted on output port (i). |
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52 | // Therefore, in case of broadcast, NI & NT must be equal, and all |
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53 | // connected components mus have the same index for input & output ports. |
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54 | /////////////////////////////////////////////////////////////////////////// |
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55 | |
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56 | #include <systemc> |
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57 | #include <cassert> |
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58 | #include "vci_buffers.h" |
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59 | #include "../include/vci_local_crossbar.h" |
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60 | #include "alloc_elems.h" |
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61 | |
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62 | namespace soclib { namespace caba { |
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63 | |
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64 | using soclib::common::alloc_elems; |
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65 | using soclib::common::dealloc_elems; |
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66 | |
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67 | using namespace sc_core; |
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68 | |
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69 | //////////////////////////////////////////////// |
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70 | template<typename pkt_t> |
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71 | class SimpleCrossbar |
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72 | //////////////////////////////////////////////// |
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73 | { |
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74 | const size_t m_cluster_id; // cluster index |
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75 | const size_t m_in_size; // total number of inputs (local + global) |
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76 | const size_t m_out_size; // total number of outputs (local + global) |
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77 | const void* m_rt; // routing table if cmd / masking table if rsp |
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78 | const void* m_lt; // locality table if cmd / id_locality table if rsp |
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79 | const bool m_is_cmd; // cmd crossbar when true |
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80 | |
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81 | bool m_barrier; // barrier in the global interface is enabled |
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82 | bool m_barrier_release; // request to release the barrier |
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83 | |
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84 | sc_signal<bool>* r_allocated; // for each output port: allocation state |
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85 | sc_signal<size_t>* r_origin; // for each output port: input port index |
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86 | sc_signal<bool>* r_bc_state; // for each input port: broadcast requested |
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87 | sc_signal<size_t>* r_bc_count; // for each input port: requested output index |
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88 | |
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89 | public: |
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90 | //////////////////////////////// |
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91 | SimpleCrossbar( size_t cluster_id, // cluster index |
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92 | size_t in_size, // number of inputs |
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93 | size_t out_size, // number of outputs |
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94 | void* rt, // routing table |
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95 | void* lt, // locality table |
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96 | bool is_cmd, |
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97 | bool barrier = false) |
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98 | : m_cluster_id( cluster_id ), |
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99 | m_in_size( in_size ), |
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100 | m_out_size( out_size ), |
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101 | m_rt( rt ), |
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102 | m_lt( lt ), |
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103 | m_is_cmd( is_cmd ), |
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104 | m_barrier( barrier ), |
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105 | m_barrier_release( false ) |
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106 | { |
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107 | r_allocated = new sc_signal<bool>[out_size]; |
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108 | r_origin = new sc_signal<size_t>[out_size]; |
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109 | r_bc_state = new sc_signal<bool>[in_size]; |
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110 | r_bc_count = new sc_signal<size_t>[in_size]; |
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111 | } // end constructor |
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112 | |
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113 | ////////////////////////////////// |
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114 | inline void setBarrier(const bool &value) |
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115 | { |
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116 | m_barrier = value; |
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117 | } |
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118 | |
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119 | ////////////////////////////////// |
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120 | inline void releaseBarrier() |
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121 | { |
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122 | m_barrier_release = true; |
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123 | } |
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124 | |
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125 | //////////// |
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126 | void reset() |
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127 | { |
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128 | for (size_t i=0; i<m_out_size; ++i) |
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129 | { |
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130 | r_origin[i] = 0; |
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131 | r_allocated[i] = false; |
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132 | } |
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133 | for (size_t i=0; i<m_in_size; ++i) |
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134 | { |
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135 | r_bc_state[i] = false; |
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136 | r_bc_count[i] = 0; |
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137 | } |
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138 | } // end reset() |
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139 | |
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140 | ////////////////// |
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141 | void print_trace() |
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142 | { |
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143 | for( size_t out=0 ; out<m_out_size ; out++) |
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144 | { |
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145 | if( r_allocated[out].read() ) |
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146 | { |
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147 | if( m_is_cmd ) std::cout << std::dec |
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148 | << "initiator " << r_origin[out].read() |
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149 | << " => target " << out; |
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150 | else std::cout << std::dec |
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151 | << "target " << r_origin[out].read() |
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152 | << " => initiator " << out; |
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153 | } |
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154 | } |
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155 | for ( size_t in=0 ; in<m_in_size ; in++) |
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156 | { |
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157 | if( r_bc_state[in].read() ) |
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158 | { |
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159 | if( m_is_cmd ) std::cout << " broadcast request from initiator " << in |
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160 | << " requesting target " |
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161 | << r_bc_count[in].read(); |
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162 | else std::cout << " broadcast request from target " << in |
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163 | << " requesting initiator " |
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164 | << r_bc_count[in].read(); |
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165 | } |
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166 | } |
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167 | std::cout << " / barrier enable = " << m_barrier; |
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168 | } // end print_trace() |
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169 | |
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170 | ////////////////////////// |
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171 | size_t route( pkt_t flit ) |
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172 | { |
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173 | if( m_is_cmd ) // we use a 64 bits AddressDecodingTable for ADDRESS |
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174 | { |
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175 | soclib::common::AddressDecodingTable<uint64_t, size_t>* rt = |
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176 | (soclib::common::AddressDecodingTable<uint64_t, size_t>*)m_rt; |
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177 | return rt->get_value( (uint64_t)(flit.dest()) ); |
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178 | } |
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179 | else // we use a 32 bits AddressDecodingTable for SRCID |
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180 | { |
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181 | soclib::common::AddressDecodingTable<uint32_t, size_t>* rt = |
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182 | (soclib::common::AddressDecodingTable<uint32_t, size_t>*)m_rt; |
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183 | return rt->get_value( (uint32_t)(flit.dest()) ); |
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184 | } |
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185 | } // end route() |
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186 | |
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187 | /////////////////////////// |
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188 | bool is_local( pkt_t flit ) |
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189 | { |
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190 | if( m_is_cmd ) // we use a 64 bits AddressDecoding Table for ADDRESS |
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191 | { |
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192 | soclib::common::AddressDecodingTable<uint64_t, bool>* lt = |
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193 | (soclib::common::AddressDecodingTable<uint64_t, bool>*)m_lt; |
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194 | return lt->get_value( (uint64_t)(flit.dest()) ); |
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195 | } |
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196 | else // we use a 32 bits AddressDecodingTable for SRCID |
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197 | { |
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198 | soclib::common::AddressDecodingTable<uint32_t, bool>* lt = |
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199 | (soclib::common::AddressDecodingTable<uint32_t, bool>*)m_lt; |
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200 | return lt->get_value( (uint32_t)(flit.dest()) ); |
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201 | } |
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202 | } // end is_local() |
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203 | |
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204 | ////////////////////////////////////////////////////////////// |
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205 | void transition( typename pkt_t::input_port_t **input_port, |
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206 | typename pkt_t::output_port_t **output_port ) |
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207 | { |
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208 | // loop on the input ports to handle r_bc_state[in] and r_bc_count[in] |
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209 | for( size_t in = 0 ; in < m_in_size ; in++ ) |
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210 | { |
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211 | /* drop global-to-local packets when the barrier is enabled */ |
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212 | bool write = input_port[in]->getVal(); |
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213 | if ( in == (m_in_size - 1) ) |
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214 | write = write && !m_barrier; |
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215 | |
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216 | if ( write ) |
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217 | { |
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218 | if ( r_bc_state[in].read() ) // pending broadcast |
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219 | { |
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220 | size_t out = r_bc_count[in]; |
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221 | if ( ( r_allocated[out].read() ) && |
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222 | ( r_origin[out].read() == in ) && |
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223 | ( output_port[out]->toPeerEnd() ) ) // successfully transmitted |
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224 | { |
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225 | // the broadcast should not be sent to the requester... |
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226 | if ( (out == 0) || ((out == 1) && (in == 0)) ) r_bc_state[in] = false; |
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227 | else if ( (out-1) != in ) r_bc_count[in] = out-1; |
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228 | else r_bc_count[in] = out-2; |
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229 | } |
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230 | } |
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231 | else // no pending proadcast |
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232 | { |
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233 | pkt_t tmp; |
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234 | tmp.readFrom(*input_port[in]); |
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235 | if ( tmp.is_broadcast() ) // broadcast request |
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236 | { |
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237 | assert( input_port[in]->eop && |
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238 | "error in vci_local_crossbar : VCI broacast packet must be one flit"); |
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239 | |
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240 | r_bc_state[in] = true; |
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241 | // the broadcast should not be sent to the requester... |
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242 | if ( in == m_in_size-1 ) r_bc_count[in] = m_out_size-2; |
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243 | else r_bc_count[in] = m_out_size-1; |
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244 | } |
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245 | } |
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246 | } |
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247 | } |
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248 | |
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249 | // loop on the output ports to handle r_allocated[out] and r_origin[out] |
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250 | for ( size_t out = 0; out < m_out_size; out++) |
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251 | { |
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252 | // de-allocation if the last flit is accepted |
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253 | if ( r_allocated[out] ) |
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254 | { |
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255 | if ( output_port[out]->toPeerEnd() ) r_allocated[out] = false; |
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256 | } |
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257 | // allocation respecting round-robin priority (even for broadcast) |
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258 | else |
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259 | { |
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260 | for(size_t _in = 0; _in < m_in_size; _in++) |
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261 | { |
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262 | size_t in = (_in + r_origin[out] + 1) % m_in_size; |
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263 | |
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264 | /* drop global-to-local packets when the barrier is enabled */ |
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265 | bool write = input_port[in]->getVal(); |
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266 | if ( in == (m_in_size - 1) ) |
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267 | write = write && !m_barrier; |
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268 | |
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269 | if ( write ) |
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270 | { |
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271 | pkt_t tmp; |
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272 | tmp.readFrom(*input_port[in]); |
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273 | |
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274 | // broadcast request |
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275 | bool bc_req = tmp.is_broadcast() and |
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276 | r_bc_state[in].read() and (r_bc_count[in].read() == out); |
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277 | |
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278 | // to global request |
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279 | bool gl_req = not tmp.is_broadcast() and (out == m_out_size-1) and |
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280 | not is_local( tmp ) and (in != m_in_size-1); |
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281 | |
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282 | // to local request |
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283 | bool lc_req = not tmp.is_broadcast() and (out == route( tmp )) and |
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284 | is_local( tmp ); |
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285 | |
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286 | // to migrated segment request (to local) |
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287 | bool mg_req = not tmp.is_broadcast() and (out == route( tmp )) and |
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288 | not is_local( tmp ) and (in == m_in_size-1); |
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289 | |
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290 | if ( bc_req or gl_req or lc_req or mg_req ) |
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291 | { |
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292 | r_allocated[out] = true; |
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293 | r_origin[out] = in; |
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294 | break; |
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295 | } |
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296 | } |
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297 | } |
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298 | } |
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299 | } |
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300 | |
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301 | // release the barrier if there is no pending global-to-local |
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302 | // request. This avoid a race condition situation between a |
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303 | // global-to-local request and the release of the barrier. In |
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304 | // such situation, for multi-flit packets, some flits may be |
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305 | // dropped and others not. |
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306 | if (m_barrier && m_barrier_release && !input_port[m_in_size-1]->getVal()) |
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307 | { |
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308 | m_barrier = false; |
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309 | } |
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310 | } // end transition |
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311 | |
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312 | ///////////////////////////////////////////////////////////// |
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313 | void genMealy( typename pkt_t::input_port_t **input_port, |
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314 | typename pkt_t::output_port_t **output_port ) |
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315 | { |
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316 | bool ack[m_in_size]; |
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317 | for( size_t in = 0; in < m_in_size; in++) ack[in] = false; |
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318 | |
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319 | // transmit flits on output ports |
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320 | for( size_t out = 0; out < m_out_size; out++) |
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321 | { |
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322 | if (r_allocated[out]) |
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323 | { |
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324 | size_t in = r_origin[out]; |
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325 | pkt_t tmp; |
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326 | tmp.readFrom(*input_port[in]); |
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327 | |
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328 | // if the hardware barrier is activated, drop all |
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329 | // local-to-global packets. This is done by consuming every |
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330 | // incoming packet (send the acknowledgement to the input port) |
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331 | // and resetting the cmdval signal to the upper network level. |
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332 | // When there is a barrier release request, local-to-global |
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333 | // request are allowed. |
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334 | bool read = output_port[out]->getAck(); |
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335 | if (out == (m_out_size - 1)) { |
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336 | read = read || (m_barrier && !m_barrier_release); |
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337 | tmp.set_val(tmp.val() && (!m_barrier || m_barrier_release)); |
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338 | } |
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339 | |
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340 | ack[in] = read; |
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341 | tmp.writeTo(*output_port[out]); |
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342 | |
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343 | if ( r_bc_state[in].read() ) // its a broacast |
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344 | { |
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345 | // in case of broadcast, the flit must be consumed only |
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346 | // if it is the last output port ... |
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347 | ack[in] = ack[in] && ( (out == 0) || ((out == 1) && (in == 0)) ); |
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348 | } |
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349 | } |
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350 | else |
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351 | { |
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352 | output_port[out]->setVal( false ); |
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353 | } |
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354 | } |
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355 | // Drop all global-to-local packets when the hardware barrier is enabled |
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356 | ack[m_in_size - 1] = ack[m_in_size - 1] || m_barrier; |
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357 | |
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358 | // Send acknowledges on input ports |
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359 | for( size_t in = 0; in < m_in_size; in++) input_port[in]->setAck( ack[in] ); |
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360 | } // en genmealy |
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361 | |
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362 | }; // end class SimpleCrossbar |
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363 | |
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364 | #define tmpl(x) template<typename vci_param> x VciLocalCrossbar<vci_param> |
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365 | |
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366 | ///////////////////////// |
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367 | tmpl(void)::print_trace() |
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368 | { |
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369 | std::cout << "LOCAL_CROSSBAR " << name() << " / "; |
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370 | m_cmd_crossbar->print_trace(); |
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371 | std::cout << " / "; |
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372 | m_rsp_crossbar->print_trace(); |
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373 | std::cout << std::endl; |
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374 | } |
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375 | |
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376 | //////////////////////// |
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377 | tmpl(void)::transition() |
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378 | { |
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379 | if ( ! p_resetn.read() ) |
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380 | { |
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381 | m_cmd_crossbar->reset(); |
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382 | m_rsp_crossbar->reset(); |
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383 | return; |
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384 | } |
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385 | |
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386 | if ( p_barrier_enable != NULL ) |
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387 | { |
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388 | if ( p_barrier_enable->read() == 0xFFFFFFFF ) |
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389 | { |
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390 | m_cmd_crossbar->releaseBarrier(); |
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391 | m_rsp_crossbar->releaseBarrier(); |
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392 | } |
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393 | } |
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394 | m_cmd_crossbar->transition( m_ports_to_initiator, m_ports_to_target ); |
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395 | m_rsp_crossbar->transition( m_ports_to_target, m_ports_to_initiator ); |
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396 | } |
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397 | |
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398 | ////////////////////// |
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399 | tmpl(void)::genMealy() |
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400 | { |
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401 | m_cmd_crossbar->genMealy( m_ports_to_initiator, m_ports_to_target ); |
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402 | m_rsp_crossbar->genMealy( m_ports_to_target, m_ports_to_initiator ); |
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403 | } |
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404 | |
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405 | /////////////////////////////////////////////////////////////////////// |
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406 | tmpl(/**/)::VciLocalCrossbar( sc_core::sc_module_name name, |
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407 | const soclib::common::MappingTable &mt, |
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408 | const size_t cluster_id, |
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409 | const size_t nb_attached_initiators, |
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410 | const size_t nb_attached_targets, |
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411 | const size_t default_target_id, |
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412 | const bool hardware_barrier ) |
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413 | : BaseModule(name), |
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414 | p_clk("clk"), |
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415 | p_resetn("resetn"), |
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416 | p_to_target(soclib::common::alloc_elems<VciInitiator<vci_param> >( |
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417 | "to_target", nb_attached_targets)), |
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418 | p_to_initiator(soclib::common::alloc_elems<VciTarget<vci_param> >( |
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419 | "to_initiator", nb_attached_initiators)), |
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420 | p_target_to_up("target_to_up"), |
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421 | p_initiator_to_up("initiator_to_up"), |
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422 | m_nb_attached_initiators(nb_attached_initiators), |
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423 | m_nb_attached_targets(nb_attached_targets), |
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424 | m_cmd_rt ( mt.getLocalIndexFromAddress( cluster_id, default_target_id ) ), |
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425 | m_cmd_lt ( mt.getLocalMatchFromAddress( cluster_id ) ), |
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426 | m_rsp_rt ( mt.getLocalIndexFromSrcid( cluster_id ) ), |
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427 | m_rsp_lt ( mt.getLocalMatchFromSrcid( cluster_id ) ) |
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428 | { |
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429 | std::cout << " - Building VciLocalCrossbar " << name << std::dec << std::endl |
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430 | << " => cluster_id = " << cluster_id << std::endl |
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431 | << " => targets = " << nb_attached_targets << std::endl |
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432 | << " => initiators = " << nb_attached_initiators << std::endl |
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433 | << " => default target = " << default_target_id << std::endl; |
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434 | |
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435 | SC_METHOD(transition); |
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436 | dont_initialize(); |
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437 | sensitive << p_clk.pos(); |
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438 | |
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439 | SC_METHOD(genMealy); |
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440 | dont_initialize(); |
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441 | sensitive << p_clk.neg(); |
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442 | |
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443 | for ( size_t i=0; i<nb_attached_initiators; ++i ) |
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444 | sensitive << p_to_initiator[i]; |
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445 | for ( size_t i=0; i<nb_attached_targets; ++i ) |
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446 | sensitive << p_to_target[i]; |
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447 | |
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448 | sensitive << p_target_to_up |
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449 | << p_initiator_to_up; |
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450 | |
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451 | // building cmd and rsp crossbars |
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452 | m_cmd_crossbar = new SimpleCrossbar<VciCmdBuffer<vci_param> >( |
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453 | cluster_id, |
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454 | nb_attached_initiators+1, |
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455 | nb_attached_targets+1, |
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456 | (void*)(&m_cmd_rt), |
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457 | (void*)(&m_cmd_lt), |
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458 | true, |
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459 | hardware_barrier ); |
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460 | |
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461 | m_rsp_crossbar = new SimpleCrossbar<VciRspBuffer<vci_param> >( |
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462 | cluster_id, |
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463 | nb_attached_targets+1, |
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464 | nb_attached_initiators+1, |
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465 | (void*)(&m_rsp_rt), |
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466 | (void*)(&m_rsp_lt), |
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467 | false, |
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468 | hardware_barrier ); |
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469 | |
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470 | m_ports_to_initiator = new VciTarget<vci_param>*[nb_attached_initiators+1]; |
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471 | for (size_t i=0; i<nb_attached_initiators; ++i) |
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472 | m_ports_to_initiator[i] = &p_to_initiator[i]; |
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473 | m_ports_to_initiator[nb_attached_initiators] = &p_target_to_up; |
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474 | |
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475 | m_ports_to_target = new VciInitiator<vci_param>*[nb_attached_targets+1]; |
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476 | for (size_t i=0; i<nb_attached_targets; ++i) |
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477 | m_ports_to_target[i] = &p_to_target[i]; |
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478 | m_ports_to_target[nb_attached_targets] = &p_initiator_to_up; |
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479 | |
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480 | if (hardware_barrier) |
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481 | p_barrier_enable = new sc_in<uint32_t>("p_barrier_enable"); |
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482 | else |
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483 | p_barrier_enable = NULL; |
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484 | } |
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485 | |
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486 | /////////////////////////////// |
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487 | tmpl(/**/)::~VciLocalCrossbar() |
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488 | { |
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489 | soclib::common::dealloc_elems(p_to_initiator, m_nb_attached_initiators); |
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490 | soclib::common::dealloc_elems(p_to_target, m_nb_attached_targets); |
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491 | } |
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492 | |
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493 | }} |
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494 | |
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495 | // Local Variables: |
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496 | // tab-width: 4 |
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497 | // c-basic-offset: 4 |
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498 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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499 | // indent-tabs-mode: nil |
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500 | // End: |
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501 | |
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502 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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