From 403c53fd6c7059c159db1604eb178251239fc4bf Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Mon, 4 Nov 2019 03:25:16 +0100
Subject: Implement serial connection and basic testing

---
 kernel/src/io/serial.rs | 53 ++++++++++++++++++++++++++++++++-----------------
 1 file changed, 35 insertions(+), 18 deletions(-)

(limited to 'kernel/src/io/serial.rs')

diff --git a/kernel/src/io/serial.rs b/kernel/src/io/serial.rs
index e1d4660..2a3bae8 100644
--- a/kernel/src/io/serial.rs
+++ b/kernel/src/io/serial.rs
@@ -1,25 +1,42 @@
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[repr(u32)]
-pub enum QemuExitCode {
-    Success = 0x10, // The actual exit code is (value << 1) | 1.
-    Failed = 0x11,
+use spin::Mutex;
+use uart_16550::SerialPort;
+
+/*lazy_static! {
+    pub static ref SERIAL1: Mutex<SerialPort> = {
+        let mut serial_port = unsafe { SerialPort::new(0x3F8) };
+        serial_port.init();
+        Mutex::new(serial_port)
+    };
+}*/
+const SERIAL_IO_PORT: u16 = 0x3F8;
+
+static CONNECTION: Mutex<Serial> = Mutex::new(Serial {
+    initialized: false,
+    port: unsafe { SerialPort::new(SERIAL_IO_PORT) },
+});
+
+struct Serial {
+    pub initialized: bool,
+    pub port: SerialPort,
 }
 
-pub fn exit_qemu(exit_code: QemuExitCode) {
-    use x86_64::instructions::port::Port;
+pub struct SerialStream {}
 
-    unsafe {
-        let mut port = Port::new(0xf4);
-        port.write(exit_code as u32);
+impl SerialStream {
+    pub fn new() -> Self {
+        SerialStream {}
     }
 }
 
-fn trivial_assertion() {
-    use crate::io::vga_text::OStream;
-    let mut stdout = OStream::new();
-    stdout.clear();
-
-    stdout.print(b"trivial assertion... ");
-    assert_eq!(0, 1);
-    stdout.print(b"[ok]");
+impl core::fmt::Write for SerialStream {
+    fn write_str(&mut self, s: &str) -> core::fmt::Result {
+        let mut guard = CONNECTION.lock();
+        if !guard.initialized {
+            unsafe {
+                guard.port.init();
+            }
+            guard.initialized = true;
+        }
+        guard.port.write_str(s)
+    }
 }
-- 
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