bus.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,

#include <clock.hh>
#include <device.hh>
#include <pcidevice.hh>
#include <inttypes.hh>
#include <module.hh>
#include <mips64/bus.hh>

#define TIMER_CLOCKS_PER_TICK 2

class MIPS64SimpleBus
    : public virtual Serializable, public MIPS64Bus
{
private:

    static SerialType<MIPS64SimpleBus> type;

    // The memory array.
    UInt64* ram;
    UInt64  memory_size;
    const char* file_name;

    Device* decode[16];
    Device* cs1_subdecode[4];
    PCIDevice* pcidev[8];
    UInt32 pciconfig_address;

    Device *find_device(char *name);
    ClockValue pciconfig_read(UInt32 addr, UInt32* buf, int size);
    ClockValue pciconfig_write(UInt32 addr, const UInt32* buf, int size);

    class Timer : public Event
    {
      private:
	MIPS64SimpleBus *bus;
	int timer_id;
	bool running, is_timer;
	UInt32 start_value;

      public:
	Timer(MIPS64SimpleBus *b, int id)
		: Event(0, 0), bus(b), timer_id(id) { running = false; }
	void invoke();

	UInt32 read();
	void write(UInt32 val);
	void control(bool enable, bool timer);
    };
    friend class Timer;

    Timer *timer[4];
    UInt32 timer_control;
    UInt32 intr_pending, intr_mask;

    void timer_interrupt(unsigned int id);
    void check_interrupts(void);

public:

    // Constructors, etc.
    MIPS64SimpleBus(const SimArgs& args);
    MIPS64SimpleBus(Checkpoint& cp);
    ~MIPS64SimpleBus();

    // 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 sz);
    ClockValue write(UInt64 addr, const UInt64* buf, int sz);

    struct {
	char *file_name;
	int memory;
	char *cpu;
	char *cs0, *cs1, *cs2, *cs3, *bootcs;
	char *cs1a, *cs1b, *cs1c, *cs1d;
	char *pciintctrl;
	char *pci[8];
    } conf;

};