src/arch/x86_64/io_port.rs


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extern "C" {
    fn _inb(port:u16) -> u8;
    fn _inw(port:u16) -> u16;
    fn _outb(port:u16, val:u8);
    fn _outw(port:u16, val:u16);
}

// The port addr is 16-bit wide.
// wrappers for in/out[b,w]
// Also I don't feel necessary to have a IO_Port Class give how 
// trivial it is
// TODO perhaps use inline asm, because the code is short

pub fn inw(p:u16) -> u16 {
    unsafe{
        _inw(p)
    }
}

pub fn inb(p:u16) -> u8 {
    unsafe{
        _inb(p)
    }
}
pub fn outb(p:u16, val:u8){
    unsafe{
        _outb(p,val);
    }
}

pub fn outw(p:u16, val:u16){
    unsafe{
        _outw(p,val)
    }
}