main.rs

#![no_std]
#![no_main]
#![feature(abi_efiapi)]

use uefi::prelude::*;
use core::fmt::Write;

#[entry]
fn efi_main(image: Handle, st: SystemTable<Boot>) -> Status {
    uefi_services::init(&st).expect_success("Failed to initialize services.");
    let mut stdout = st.stdout();
    stdout.reset(false).expect_success("Failed to reset stdout");
    use uefi::proto::console::text::Color::*;
    stdout.set_color(White, Cyan).expect_success("Failed to set colors");
    stdout.clear().expect_success("Failed to clear");

    writeln!(&mut stdout, "Hello, world!").expect("Failed to write");

    loop {
        st.boot_services().stall(1_000_000);
    }
}