types.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 mips64_types_hh_included
#define mips64_types_hh_included

#include <device.hh>
#include <inttypes.hh>
#include <object.hh>

// A collection of some fundamental MIPS64 types.

class MIPS64Types
    : public Object
{
public:

    // Fundamental types.

    typedef UInt64 VA;		// Virtual address
    typedef UInt64 PA;		// Physical address
    typedef UInt32 Instr;	// Instruction

    // Width of the MIPS64 address space.

    static const int paddr_width = 36;

    // Caching algorithm numbers.

    enum {
	noncoherent_write_through	= 0,
	noncoherent_write_allocate	= 1,
	uncached			= 2,
	noncoherent_write_back		= 3,
	exclusive			= 4,
	exclusive_on_write		= 5,
	update_on_write			= 6
    };

    // The caching algorithm is stored as part of the physical address,
    // using the same encoding as that of XKPHYS address space region.

    static int coherency_algorithm(PA pa)
	{ return bits(pa, 61, 59); }
    static PA physical_address(PA pa)
	{ return bits(pa, paddr_width, 0); }
    static PA make_physical_address(PA pa, PA ca)
	{ return pa | (ca << 59); }

    // Hardware data types.

    enum {
	byte,
	halfword,
	triplebyte,
	word,
	quintibyte,
	sextibyte,
	septibyte,
	doubleword
    };

};


#endif // mips64_types_hh_included