intpin.hh

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 * Copyright 2019 Google, Inc.
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 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer;
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 * neither the name of the copyright holders nor the names of its
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 * this software without specific prior written permission.
 *
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#ifndef __DEV_INTPIN_HH__
#define __DEV_INTPIN_HH__
 
#include "sim/port.hh"
 
namespace gem5
{
 
class IntSourcePinBase;
 
class IntSinkPinBase : public Port
{
  protected:
    friend IntSourcePinBase;
 
    IntSourcePinBase *source = nullptr;
 
    int _number = 0;
    bool _state = false;
 
    IntSinkPinBase(const std::string &_name, PortID _id, int num) :
        Port(_name, _id), _number(num)
    {}
 
    virtual void raiseOnDevice() = 0;
    virtual void lowerOnDevice() = 0;
 
    void
    raise()
    {
        _state = true;
        raiseOnDevice();
    }
 
    void
    lower()
    {
        _state = false;
        lowerOnDevice();
    }
 
  public:
    int number() { return _number; }
    bool state() { return _state; }
 
    void bind(Port &peer) override;
    void unbind() override;
};
 
template <class Device>
class IntSinkPin : public IntSinkPinBase
{
  private:
    Device *device = nullptr;
 
    void raiseOnDevice() override { device->raiseInterruptPin(number()); }
    void lowerOnDevice() override { device->lowerInterruptPin(number()); }
 
  public:
    IntSinkPin(const std::string &_name, PortID _id, Device *dev, int num) :
        IntSinkPinBase(_name, _id, num), device(dev) {}
    IntSinkPin(const std::string &_name, PortID _id, Device *dev) :
        IntSinkPin(_name, _id, dev, _id) {}
};
 
class IntSourcePinBase : public Port
{
  private:
    IntSinkPinBase *sink = nullptr;
    bool _state = false;
 
  public:
    IntSourcePinBase(const std::string &_name, PortID _id, bool def_state) :
        Port(_name, _id), _state(def_state)
    {}
 
    void raise() { sink->raise(); }
    void lower() { sink->lower(); }
 
    void bind(Port &peer) override;
    void unbind() override;
};
 
template <class Device>
class IntSourcePin : public IntSourcePinBase
{
  public:
    IntSourcePin(const std::string &_name, PortID _id, Device *owner,
                 bool def_state=false) :
        IntSourcePinBase(_name, _id, def_state)
    {}
};
 
} // namespace gem5
 
#endif //__DEV_INTPIN_HH__