signal_receiver.hh

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/*
 * Copyright 2019 Google, Inc.
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 * notice, this list of conditions and the following disclaimer;
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 * this software without specific prior written permission.
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#ifndef __ARCH_ARM_FASTMODEL_COMMON_SIGNAL_RECEIVER_HH__
#define __ARCH_ARM_FASTMODEL_COMMON_SIGNAL_RECEIVER_HH__
 
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Woverloaded-virtual"
#include <amba_pv.h>
#pragma GCC diagnostic pop
 
#include <functional>
#include <vector>
 
#include "base/compiler.hh"
#include "base/cprintf.hh"
#include "base/types.hh"
#include "dev/intpin.hh"
 
namespace gem5
{
 
namespace fastmodel
{
 
class SignalReceiver : public amba_pv::signal_slave_base<bool>
{
  public:
    typedef std::function<void(bool)> OnChangeFunc;
 
  private:
    bool _state;
    OnChangeFunc _onChange;
 
  public:
    amba_pv::signal_slave_export<bool> signal_in;
 
    SignalReceiver(const std::string &name, OnChangeFunc on_change=nullptr) :
        SignalReceiver(name.c_str(), on_change)
    {}
 
    SignalReceiver(const char *name, OnChangeFunc on_change=nullptr) :
        amba_pv::signal_slave_base<bool>(name),
        _state(false), _onChange(on_change)
    {
        signal_in.bind(*this);
    }
 
    void onChange(OnChangeFunc func) { _onChange = func; }
 
    void
    set_state(int export_id, const bool &new_state) override
    {
        if (new_state == _state)
            return;
 
        _state = new_state;
        _onChange(_state);
    }
};
 
class SignalReceiverInt : public SignalReceiver
{
  public:
    using IntPin = SignalSourcePort<bool>;
 
    explicit SignalReceiverInt(const std::string &name)
        : SignalReceiver(name)
    {
        onChange([this](bool status) {
            for (auto &signal : signalOut) {
                if (signal && signal->isConnected())
                    signal->set(status);
            }
        });
    }
 
    IntPin &
    getSignalOut(int idx)
    {
        if (signalOut.size() <= idx) {
            signalOut.resize(idx + 1);
        }
        if (!signalOut[idx]) {
            signalOut[idx] = std::make_unique<IntPin>(
                csprintf("%s.signalOut[%d]", get_name(), idx), idx);
        }
        return *signalOut[idx];
    }
 
  private:
    std::vector<std::unique_ptr<IntPin>> signalOut;
};
 
} // namespace fastmodel
} // namespace gem5
 
#endif // __ARCH_ARM_FASTMODEL_COMMON_SIGNAL_RECEIVER_HH__