memory.java

用jAVA实现的一个CPU32位的指令代码

import java.util.HashMap;
import java.util.Map;


public class Memory {
	
	private Map<Long,String> hashMap;
	static long MINADDR=0x00000000;
	static long DATABASE=0x00000000;
	static long CODEBASE=0x00004000;
	static long MAXADDR=(long)Math.pow(2, 32);

	public Memory() {
		this.hashMap=new HashMap<Long,String>();
	}

	//read memory
	public String read(Long addr){
		if((MINADDR<=addr)&(MAXADDR>addr)){
			return hashMap.get(addr);
		}else
			return null;
		
	}
	
	//write memory
	public void write(Long addr,String value){
		if((CODEBASE>addr)&(MINADDR<=addr)){
			hashMap.put(addr, value);
		}
		 
	}
	public void loader(Long addr,String value){
		if(CODEBASE<=addr){
			hashMap.put(addr, value);
		}
	}
	

}