Rustboot Modified

#![feature(no_std)]
#![no_std]
#![allow(ctypes)]

enum Color {
    Black      = 0,
    Blue       = 1,
    Green      = 2,
    Cyan       = 3,
    Red        = 4,
    Pink       = 5,
    Brown      = 6,
    LightGray  = 7,
    DarkGray   = 8,
    LightBlue  = 9,
    LightGreen = 10,
    LightCyan  = 11,
    LightRed   = 12,
    LightPink  = 13,
    Yellow     = 14,
    White      = 15,
}

enum Option<T> {
    None,
    Some(T)
}

struct IntRange {
    cur: i32,
    max: i32
}

impl IntRange {
    fn next(&mut self) -> Option<i32> {
        if self.cur < self.max {
            self.cur += 1;
            Option::Some(self.cur - 1)
        } else {
            Option::None
        }
    }
}

fn range(lo: i32, hi: i32) -> IntRange {
    IntRange { cur: lo, max: hi }
}

fn clear_screen(background: Color) {
    for i in range(0, 80 * 25) {
        unsafe {
            *((0xb8000 + i * 2) as *mut u16) = (background as u16) << 12;
        }
    }
}

#[no_mangle]
pub fn main() {
    clear_screen(Color::LightRed);
}