rtc.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 rtc_hh_included
#define rtc_hh_included


#include <clock.hh>
#include <checkpoint.hh>
#include <cpu.hh>
#include <device.hh>
#include <inttypes.hh>
#include <module.hh>
#include <serial.hh>
#include <simarg.hh>

#define USE_MMAP

class MT48Tx2
    : public Module, public Device
{
private:

    static SerialType<MT48Tx2> type;

    // Size of the data.
    static const int size = 2*KB;

    // Configuration parameter cache.
    const char* file_name;
    ClockValue read_latency, write_latency;
    ClockValue initial_time;
    UInt8 initial_seconds;
    UInt8 initial_minutes;
    UInt8 initial_hour;
    UInt8 initial_weekday;
    UInt8 initial_date;
    UInt8 initial_month;
    UInt8 initial_year;

   // The clock frequency for which the cached values are valid.
    ClockValue freq;

    // Actual data array.
    char *data;

    // Register locations.
    enum Register {
	CONTROL = 0x7f8, SECONDS, MINUTES, HOUR, WEEKDAY, DATE, MONTH, YEAR
    };

    // Update the register locations.
    void update_read(Clock *clock);
    void update_write(Clock *clock);

    // Load the ROM image.

public:

    // Constructors, etc.
    MT48Tx2(const SimArgs& args);
    MT48Tx2(Checkpoint& cp);
    ~MT48Tx2();

    // Module interfaces.
    void reset(bool warm);

    // Serialization information.
    void checkpoint(Checkpoint& cp, bool parent = false) const;
    
    // Device access.
    ClockValue read(UInt64 addr, UInt64* buf, int size);
    ClockValue write(UInt64 addr, const UInt64* buf, int size);

private:

    // Conviguration data.
    struct {
	char* file_name;
	int read_latency, write_latency;
    } conf;
};

#endif // rtc_hh_included