ember_os 0.1.3

A simple OS kernel implemented in rust, which has referenced https://os.phil-opp.com/
Documentation 
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[repr(u32)]
pub enum QemuExitCode {
  Success = 0x10,
  Failed = 0x11,
}

pub fn exit_qemu(exit_code: QemuExitCode) {
  use x86_64::instructions::port::Port;
  unsafe {
    let mut port = Port::new(0xf4);
    port.write(exit_code as u32);
  }
}