main.cc

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 <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <serial.hh>
#include <sulima.hh>
#include "rtc.hh"


// Serialization information.

SerialType<MT48Tx2> MT48Tx2::type(
    "MT48Tx2",
    "T48T02/12 Timekeeper(R) RAM"
);


// Runtime constructor.

MT48Tx2::MT48Tx2(const SimArgs &args)
    : Module(args), Device(8), file_name(0)
{
    define("fileName", conf.file_name);
    define("readLatency", conf.read_latency, 150);
    define("writeLatency", conf.write_latency, 150);
}


// Serialized constructor.

MT48Tx2::MT48Tx2(Checkpoint &cp)
    : Module(cp), Device(8), file_name(extract_word(cp))
{
    define("fileName", conf.file_name, file_name);
    cp >> conf.read_latency >> conf.write_latency >> '\n';
    define("readLatency", conf.read_latency, conf.read_latency);
    define("writeLatency", conf.write_latency, conf.write_latency);
    reset(false);
}


// Checkpointing interface.

void
MT48Tx2::checkpoint(Checkpoint &cp, bool parent) const
{
    ClockValue rl = nanoseconds(read_latency, freq);
    ClockValue wl = nanoseconds(write_latency, freq);
    if (parent)
	cp << type << ' ' << id << '\n';
    cp << file_name << ' ' << rl << ' ' << wl << '\n';
    if (file_name[0]) {
	FILE *fp = fopen(conf.file_name, "wb");
	if (!fp)
	    throw FileError(conf.file_name);
	fwrite(data, 1, size, fp);
	if (ferror(fp) || fclose(fp)) {
	    fclose(fp);
	    throw FileError(conf.file_name);
	}
	fclose(fp);
    }
}

// Destructor.

MT48Tx2::~MT48Tx2()
{
    delete file_name;
}


// Module interface.

void
MT48Tx2::reset(bool warm)
{
    if (!warm) {
#ifdef USE_MMAP
	int fd = open(conf.file_name, O_RDWR|O_CREAT, 0600);
	if (fd != -1)
	{
		ftruncate(fd, size);
		data = (char *)mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
	}
	else
	{
#endif
	data = new char[size];
	memset(data, 0, size);
	if (conf.file_name[0]) {
	    FILE *fp = fopen(conf.file_name, "rb");
	    if (!fp)
		throw FileError(conf.file_name);
	    fread(data, 1, size, fp);
	    if (ferror(fp)) {
		fclose(fp);
		throw FileError(conf.file_name);
	    }
	    fclose(fp);
	}
	delete file_name;
#ifdef USE_MMAP
	}
#endif
	file_name = copy(conf.file_name);
	read_latency = conf.read_latency;
	write_latency = conf.write_latency;
	// initially latencies are specified in nanoseconds
	freq = nanoseconds(1,1);
    }
}