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int x,y;  
unsigned char cycle = 0;
char mouse_bytes[2];

void mouse_handler(struct regs *r)
{

  mouse_bytes[cycle++] = inportb(0x60);

  if (cycle == 3) { // if we have all the 3 bytes...
    cycle = 0; // reset the counter
    
    vid.puts("X: ",ALERT);
    vid.putn(mouse_bytes[1], ALERT);
    vid.putc(' ',ALERT);
    vid.puts("Y: ",ALERT);
    vid.putn(mouse_bytes[2], ALERT);
    
    // do what you wish with the bytes, this is just a sample
    if ((mouse_bytes[0] & 0x80) || (mouse_bytes[0] & 0x40))
      return; // the mouse only sends information about overflowing, do not care about it and return
    if (!(mouse_bytes[0] & 0x20))
      y |= 0xFFFFFF00; //delta-y is a negative value
    if (!(mouse_bytes[0] & 0x10))
      x |= 0xFFFFFF00; //delta-x is a negative value
    if (mouse_bytes[0] & 0x4)
      vid.puts("Middle button is pressed!n",ALERT);
    if (mouse_bytes[0] & 0x2)
      vid.puts("Right button is pressed!n",ALERT);
    if (mouse_bytes[0] & 0x1)
      vid.puts("Left button is pressed!n",ALERT);

  }
}

void mouse_wait(unsigned char type)
{
  unsigned int _time_out=100000;
  if(type==0)
  {
    while(_time_out--) //Data
    {
      if((inportb(0x64) & 1)==1)
      {
        return;
      }
    }
    return;
  }
  else
  {
    while(_time_out--) //Signal
    {
      if((inportb(0x64) & 2)==0)
      {
        return;
      }
    }
    return;
  }
}

/* Installs the keyboard handler into IRQ1 */
void keyboard_install()
{
    irq_install_handler(1, keyboard_handler);
}

void mouse_write(unsigned char a_write)
{
//Wait to be able to send a command
mouse_wait(1);
//Tell the mouse we are sending a command
outportb(0x64, 0xD4);
//Wait for the final part
mouse_wait(1);
//Finally write
outportb(0x60, a_write);
}

unsigned char mouse_read()
{
//Get response from mouse
mouse_wait(0);
return inportb(0x60);
}

void mouse_install()
{
     mouse_wait(1);
     outportb(0x64,0xA8);
     
     mouse_wait(1);
     outportb(0x64,0x20);
     
     unsigned char status_byte;
     mouse_wait(0);
     status_byte = (inportb(0x60) | 2);
     
     mouse_wait(1);
     outportb(0x64, 0x60);
     
    mouse_wait(1);
    outportb(0x60, status_byte);
    mouse_write(0xF6);
    mouse_read();
    mouse_write(0xF4);
    mouse_read();
    irq_install_handler(12, mouse_handler);
}

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Try an emulator, and also take note of what kind of connection the mouse uses.