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Rust

// SPDX-License-Identifier: MIT OR Apache-2.0
//
// Copyright (c) 2019-2021 Andre Richter <andre.o.richter@gmail.com>
//! Console sanity tests - RX, TX and statistics.
#![feature(format_args_nl)]
#![no_main]
#![no_std]
use libkernel::{bsp, console, cpu, exception, print};
#[no_mangle]
unsafe fn kernel_init() -> ! {
use bsp::console::console;
use console::interface::*;
exception::handling_init();
bsp::console::qemu_bring_up_console();
// Handshake
assert_eq!(console().read_char(), 'A');
assert_eq!(console().read_char(), 'B');
assert_eq!(console().read_char(), 'C');
print!("OK1234");
// 6
print!("{}", console().chars_written());
// 3
print!("{}", console().chars_read());
// The QEMU process running this test will be closed by the I/O test harness.
// cpu::wait_forever();
// For some reason, in this test, rustc or the linker produces an empty binary when
// wait_forever() is used. Calling qemu_exit_success() fixes this behavior. So for the time
// being, the following lines are just a workaround to fix this compiler/linker weirdness.
use libkernel::time::interface::TimeManager;
libkernel::time::time_manager().spin_for(core::time::Duration::from_secs(3600));
cpu::qemu_exit_success()
}