sc_signal_rv.hh revision 13214
112841Sgabeblack@google.com/* 212841Sgabeblack@google.com * Copyright 2018 Google, Inc. 312841Sgabeblack@google.com * 412841Sgabeblack@google.com * Redistribution and use in source and binary forms, with or without 512841Sgabeblack@google.com * modification, are permitted provided that the following conditions are 612841Sgabeblack@google.com * met: redistributions of source code must retain the above copyright 712841Sgabeblack@google.com * notice, this list of conditions and the following disclaimer; 812841Sgabeblack@google.com * redistributions in binary form must reproduce the above copyright 912841Sgabeblack@google.com * notice, this list of conditions and the following disclaimer in the 1012841Sgabeblack@google.com * documentation and/or other materials provided with the distribution; 1112841Sgabeblack@google.com * neither the name of the copyright holders nor the names of its 1212841Sgabeblack@google.com * contributors may be used to endorse or promote products derived from 1312841Sgabeblack@google.com * this software without specific prior written permission. 1412841Sgabeblack@google.com * 1512841Sgabeblack@google.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1612841Sgabeblack@google.com * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1712841Sgabeblack@google.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 1812841Sgabeblack@google.com * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 1912841Sgabeblack@google.com * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2012841Sgabeblack@google.com * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2112841Sgabeblack@google.com * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2212841Sgabeblack@google.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2312841Sgabeblack@google.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2412841Sgabeblack@google.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2512841Sgabeblack@google.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2612841Sgabeblack@google.com * 2712841Sgabeblack@google.com * Authors: Gabe Black 2812841Sgabeblack@google.com */ 2912841Sgabeblack@google.com 3012841Sgabeblack@google.com#ifndef __SYSTEMC_EXT_CHANNEL_SC_SIGNAL_RV_HH__ 3112841Sgabeblack@google.com#define __SYSTEMC_EXT_CHANNEL_SC_SIGNAL_RV_HH__ 3212841Sgabeblack@google.com 3312841Sgabeblack@google.com#include "../core/sc_module.hh" // for sc_gen_unique_name 3413214Sgabeblack@google.com#include "../core/scheduler.hh" 3513214Sgabeblack@google.com#include "../dt/bit/sc_logic.hh" 3613214Sgabeblack@google.com#include "../dt/bit/sc_lv.hh" 3712841Sgabeblack@google.com#include "sc_signal.hh" 3812841Sgabeblack@google.com#include "warn_unimpl.hh" 3912841Sgabeblack@google.com 4012841Sgabeblack@google.comnamespace sc_dt 4112841Sgabeblack@google.com{ 4212841Sgabeblack@google.com 4312841Sgabeblack@google.comtemplate <int W> 4412841Sgabeblack@google.comclass sc_lv; 4512841Sgabeblack@google.com 4612841Sgabeblack@google.com}; 4712841Sgabeblack@google.com 4812841Sgabeblack@google.comnamespace sc_core 4912841Sgabeblack@google.com{ 5012841Sgabeblack@google.com 5112841Sgabeblack@google.comclass sc_port_base; 5212841Sgabeblack@google.com 5312841Sgabeblack@google.comtemplate <int W> 5412841Sgabeblack@google.comclass sc_signal_rv : public sc_signal<sc_dt::sc_lv<W>, SC_MANY_WRITERS> 5512841Sgabeblack@google.com{ 5612841Sgabeblack@google.com public: 5712841Sgabeblack@google.com sc_signal_rv() : sc_signal<sc_dt::sc_lv<W>, SC_MANY_WRITERS>( 5812841Sgabeblack@google.com sc_gen_unique_name("signal_rv")) 5912841Sgabeblack@google.com {} 6012841Sgabeblack@google.com sc_signal_rv(const char *name) : 6112841Sgabeblack@google.com sc_signal<sc_dt::sc_lv<W>, SC_MANY_WRITERS>(name) 6212841Sgabeblack@google.com {} 6312841Sgabeblack@google.com virtual ~sc_signal_rv() {} 6412841Sgabeblack@google.com 6512841Sgabeblack@google.com virtual void 6612841Sgabeblack@google.com register_port(sc_port_base &, const char *) 6712841Sgabeblack@google.com { 6812841Sgabeblack@google.com sc_channel_warn_unimpl(__PRETTY_FUNCTION__); 6912841Sgabeblack@google.com } 7012841Sgabeblack@google.com 7112841Sgabeblack@google.com virtual void 7213214Sgabeblack@google.com write(const sc_dt::sc_lv<W> &l) 7312841Sgabeblack@google.com { 7413214Sgabeblack@google.com ::sc_gem5::Process *p = ::sc_gem5::scheduler.current(); 7513214Sgabeblack@google.com 7613214Sgabeblack@google.com auto it = inputs.find(p); 7713214Sgabeblack@google.com if (it == inputs.end()) { 7813214Sgabeblack@google.com inputs.emplace(p, l); 7913214Sgabeblack@google.com this->request_update(); 8013214Sgabeblack@google.com } else if (it->second != l) { 8113214Sgabeblack@google.com it->second = l; 8213214Sgabeblack@google.com this->request_update(); 8313214Sgabeblack@google.com } 8412841Sgabeblack@google.com } 8512841Sgabeblack@google.com sc_signal_rv<W> & 8613214Sgabeblack@google.com operator = (const sc_dt::sc_lv<W> &l) 8712841Sgabeblack@google.com { 8813214Sgabeblack@google.com write(l); 8912841Sgabeblack@google.com return *this; 9012841Sgabeblack@google.com } 9112841Sgabeblack@google.com sc_signal_rv<W> & 9213214Sgabeblack@google.com operator = (const sc_signal_rv<W> &r) 9312841Sgabeblack@google.com { 9413214Sgabeblack@google.com write(r.read()); 9512841Sgabeblack@google.com return *this; 9612841Sgabeblack@google.com } 9712841Sgabeblack@google.com 9812841Sgabeblack@google.com virtual const char *kind() const { return "sc_signal_rv"; } 9912841Sgabeblack@google.com 10012841Sgabeblack@google.com protected: 10112841Sgabeblack@google.com virtual void 10212841Sgabeblack@google.com update() 10312841Sgabeblack@google.com { 10413214Sgabeblack@google.com using sc_dt::Log_0; 10513214Sgabeblack@google.com using sc_dt::Log_1; 10613214Sgabeblack@google.com using sc_dt::Log_Z; 10713214Sgabeblack@google.com using sc_dt::Log_X; 10813214Sgabeblack@google.com static sc_dt::sc_logic_value_t merge_table[4][4] = { 10913214Sgabeblack@google.com { Log_0, Log_X, Log_0, Log_X }, 11013214Sgabeblack@google.com { Log_X, Log_1, Log_1, Log_X }, 11113214Sgabeblack@google.com { Log_0, Log_1, Log_Z, Log_X }, 11213214Sgabeblack@google.com { Log_X, Log_X, Log_X, Log_X } 11313214Sgabeblack@google.com }; 11413214Sgabeblack@google.com 11513214Sgabeblack@google.com // Resolve the inputs, and give the result to the underlying 11613214Sgabeblack@google.com // signal class. 11713214Sgabeblack@google.com for (int i = 0; i < W; i++) { 11813214Sgabeblack@google.com sc_dt::sc_logic_value_t bit = Log_Z; 11913214Sgabeblack@google.com for (auto &input: inputs) 12013214Sgabeblack@google.com bit = merge_table[bit][input.second.get_bit(i)]; 12113214Sgabeblack@google.com this->m_new_val.set_bit(i, bit); 12213214Sgabeblack@google.com } 12313214Sgabeblack@google.com 12413214Sgabeblack@google.com // Ask the signal to update it's value. 12513214Sgabeblack@google.com sc_signal<sc_dt::sc_lv<W>, SC_MANY_WRITERS>::update(); 12612841Sgabeblack@google.com } 12712841Sgabeblack@google.com 12812841Sgabeblack@google.com private: 12912841Sgabeblack@google.com // Disabled 13012841Sgabeblack@google.com sc_signal_rv(const sc_signal_rv<W> &) : 13112841Sgabeblack@google.com sc_signal<sc_dt::sc_lv<W>, SC_MANY_WRITERS>() 13212841Sgabeblack@google.com {} 13313214Sgabeblack@google.com 13413214Sgabeblack@google.com std::map<::sc_gem5::Process *, sc_dt::sc_lv<W> > inputs; 13512841Sgabeblack@google.com}; 13612841Sgabeblack@google.com 13712841Sgabeblack@google.com} // namespace sc_core 13812841Sgabeblack@google.com 13912841Sgabeblack@google.com#endif //__SYSTEMC_EXT_CHANNEL_SC_SIGNAL_RV_HH__ 140