cpu.hh

一个mips虚拟机非常好代码,使用C++来编写的,希望大家多学学,

#ifndef cpu_hh_included
#define cpu_hh_included

#include "inttypes.hh"
#include "clock.hh"
#include "module.hh"
#include "simarg.hh"
#include "serial.hh"
#include "interruptsink.hh"


// CPU adds fetch-execute loop support to Module.

class CPU
    : public virtual Serializable, public Module, public Clock, public InterruptSink
{
private:
    // The scheduler information (see "sulima/cpu.cc").
    static int cpu_count;
    static CPU *first_cpu, *last_cpu;
    CPU *next_cpu;
protected:
    // Timeslice of this CPU.
    // Do not change or you're wreck havoc in the scheduler!!!
    ClockValue timeslice;
    // Minimum and maximum timeslice. Adjust these if needed.
    static const ClockValue min_timeslice = 32;
    static const ClockValue max_timeslice = 16*KB;
public:
    // An interrupt event.
    class InterruptEvent
	: public virtual Serializable, public Event
    {
    private:
	static SerialType<InterruptEvent> type;
	CPU* cpu;
	Int8 num;
    public:
	InterruptEvent(Int8 n, CPU* c, ClockValue when)
	    : Event(when), cpu(c), num(n) { }
	explicit InterruptEvent(const SimArgs& args)
	    : Event(args) { assert(UNREACHABLE); }
	explicit InterruptEvent(Checkpoint& cp);
	void invoke();
	void checkpoint(Checkpoint& cp, bool parent = false) const;
    };
    // Dump state for debugging
    virtual void dump_state() = 0;
    // Constructors, etc.
    CPU(const char *n, ClockValue f);
    explicit CPU(const SimArgs &args);
    explicit CPU(Checkpoint &cp);
    void checkpoint(Checkpoint &cp, bool parent = false) const;
    // Simulator interfaces.
    virtual void run(ClockValue timeslice) = 0;
    // Tcl interfaces.
    static SimArg run_all(const SimArgs &args);

    Int32 trace_level;

};


#endif // cpu_hh_included