tulip.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 tulip_hh_included
#define tulip_hh_included

#include <pcidevice.hh>
#include "tulip_types.hh"

#define PCI_VENDOR_ID_DEC		0x1011
#define PCI_DEVICE_ID_DEC_TULIP_PLUS	0x0014
#define PCI_CLASS_NETWORK_ETHERNET	0x0200

class Tulip
    : public Module, public PCIDevice, public IOListener
{
private:
    static SerialType<Tulip> type;

    enum {
	IRQ_TI = (1 << 0),
	IRQ_TU = (1 << 2),
	IRQ_RI = (1 << 6),
	IRQ_RU = (1 << 7),
	IRQ_AIS = (1 << 15),
	IRQ_NIS = (1 << 16)
    };

    UInt32 irq_status, irq_mask;

    UInt8 tx_buffer[1518];
    UInt32 tx_base, tx_next, tx_offset;
    UInt32 rx_base, rx_next;

    union bus_mode bus_mode;
    union op_mode op_mode;
    union srom_mii srom_mii;

    static const int srom_address_bits = 6;
    UInt16 srom[1 << srom_address_bits];
    UInt16 srom_in, srom_out;

    int tap_fd;

    void read_uint32(UInt32 address, UInt32 *value);
    void write_uint32(UInt32 address, UInt32 value);

    void tx_fragment(UInt32 address, UInt32 length);
    void tx_frame();
    void tx_poll();

    void rx_fragment(UInt32 address, UInt32 length, UInt8 *buffer, UInt32 &offset, UInt32 &remaining);
    void rx_input(UInt8 *buffer, UInt32 length);

    void check_interrupts();

    void setup_tap();

public:
    void io_poll();

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

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

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

};

#endif // tulip_hh_included