rustos 0.4.3

Writing an OS in Rust
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//! Serial driver
extern crate uart_16550;
use self::uart_16550::SerialPort;
use core::fmt::{self, Write};
use lazy_static::lazy_static;
use spin::Mutex;
use x86_64::instructions::interrupts;

/// Print out the message to the serial port.
#[macro_export]
macro_rules! serial_println {
    () => ($crate::serial_print!("\n"));
    ($fmt:expr) => ($crate::serial_print!(concat!($fmt, "\n")));
    ($fmt:expr, $($arg:tt)*) => ($crate::serial_print!(
            concat!($fmt, "\n"), $($arg)*));
}

/// Print out the message to the serial port.
#[macro_export]
macro_rules! serial_print {
    ($($arg:tt)*) => ($crate::serial::_print(format_args!($($arg)*)));
}

#[doc(hidden)]
pub fn _print(args: fmt::Arguments) {
    interrupts::without_interrupts(|| {
        SERIAL1
            .lock()
            .write_fmt(args)
            .expect("Printing to serial failed");
    });
}

lazy_static! {
    /// Global serial driver.
    pub static ref SERIAL1: Mutex<SerialPort> = {
        let mut serial_port = unsafe { SerialPort::new(0x3F8) };
        serial_port.init();
        Mutex::new(serial_port)
    };
}