From 8c60628bd5db5c238d22fd3ce8b739824606a9de Mon Sep 17 00:00:00 2001
From: Christian Cunningham <c@localhost>
Date: Mon, 22 Aug 2022 21:28:11 -0700
Subject: Add serial

---
 src/serial/buffer.rs | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/serial/mod.rs    |  2 ++
 2 files changed, 54 insertions(+)
 create mode 100644 src/serial/buffer.rs
 create mode 100644 src/serial/mod.rs

(limited to 'src')

diff --git a/src/serial/buffer.rs b/src/serial/buffer.rs
new file mode 100644
index 0000000..f40771f
--- /dev/null
+++ b/src/serial/buffer.rs
@@ -0,0 +1,52 @@
+use crate::sync::NullLock;
+use crate::sync::interface::Mutex;
+use uart_16550::SerialPort;
+
+pub struct Serial {
+	buffer: Option<SerialPort>,
+}
+
+impl Serial {
+	pub const fn new() -> Self {
+		Serial { buffer: None }
+	}
+}
+
+impl NullLock<Serial> {
+	pub fn init(&self) {
+		self.lock(|serial| {
+			let mut serial_port = unsafe { SerialPort::new(0x3F8) };
+			serial_port.init();
+			serial.buffer = Some(serial_port);
+		});
+	}
+}
+
+#[doc(hidden)]
+pub fn _print(args: ::core::fmt::Arguments) {
+	use core::fmt::Write;
+	SERIAL1.lock(|serial| {
+		if let Some(buffer) = &mut serial.buffer {
+			buffer.write_fmt(args).expect("printing to serial failed!");
+		}
+	})
+}
+
+/// Prints to the host through the serial interface.
+#[macro_export]
+macro_rules! serial_print {
+	($($arg:tt)*) => {
+		$crate::serial::_print(format_args!($($arg)*));
+	};
+}
+
+/// Prints to the host through the serial interface, appending a newline.
+#[macro_export]
+macro_rules! serial_println {
+	() => ($crate::serial_print!("\n"));
+	($fmt:expr) => ($crate::serial_print!(concat!($fmt, "\n")));
+	($fmt:expr, $($arg:tt)*) => ($crate::serial_print!(
+				concat!($fmt, "\n"), $($arg)*));
+}
+
+pub static SERIAL1: NullLock<Serial> = NullLock::new(Serial::new());
diff --git a/src/serial/mod.rs b/src/serial/mod.rs
new file mode 100644
index 0000000..dc7dac5
--- /dev/null
+++ b/src/serial/mod.rs
@@ -0,0 +1,2 @@
+mod buffer;
+pub use buffer::*;
-- 
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