How can Java Write/Read hardware ports like C does? (outb, inb etc..)

Question

I've a C application. This application writes and reads some I/O port addresses.

I think that Java can't access low level I/O address natively. Am I right?

Here is an example of C++ app:

#include <malloc.h>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <sys/io.h>

int main(int argc, char *argv[])
{
    cout << "Refresh watchdog program" << endl;

    outb(0x87,0x2E);     //Extended Function Mode
    outb(0x30,0x2E);     //Set Watch Dog Timer Activate
    outb(0x01,0x2F);
    int reg = inb(0x2f);
    outb(reg|0x08, 0x2f);

}

How can I do the same in Java?

Answer 1

I think sun.misc.Unsafe might help you for this. It has methods like void putAddress(long address, long value) that may suit your need. To be honest I haven't worked on this but you could know more about it from

http://mydailyjava.blogspot.co.uk/2013/12/sunmiscunsafe.html

http://mishadoff.github.io/blog/java-magic-part-4-sun-dot-misc-dot-unsafe/

http://highlyscalable.wordpress.com/2012/02/02/direct-memory-access-in-java/

A small sample program could be found on

http://robaustin.wikidot.com/how-to-write-to-direct-memory-locations-in-java