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/mod.rs      |  2 +-
 kernel/src/io/qemu.rs     | 15 ++++++++++++++
 kernel/src/io/serial.rs   | 53 +++++++++++++++++++++++++++++++----------------
 kernel/src/io/vga_text.rs |  1 +
 kernel/src/lib.rs         | 16 ++++++++------
 5 files changed, 62 insertions(+), 25 deletions(-)
 create mode 100644 kernel/src/io/qemu.rs

(limited to 'kernel/src')

diff --git a/kernel/src/io/mod.rs b/kernel/src/io/mod.rs
index 8a0652e..9ac924a 100644
--- a/kernel/src/io/mod.rs
+++ b/kernel/src/io/mod.rs
@@ -1,3 +1,3 @@
+pub mod qemu;
 pub mod serial;
 pub mod vga_text;
-
diff --git a/kernel/src/io/qemu.rs b/kernel/src/io/qemu.rs
new file mode 100644
index 0000000..8b01885
--- /dev/null
+++ b/kernel/src/io/qemu.rs
@@ -0,0 +1,15 @@
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(u32)]
+pub enum QemuExitCode {
+    Success = 0x10, // The actual exit code is (value << 1) | 1.
+    Failed = 0x11,
+}
+
+pub fn exit_qemu(exit_code: QemuExitCode) {
+    use x86_64::instructions::port::Port;
+
+    unsafe {
+        let mut port = Port::new(0xf4);
+        port.write(exit_code as u32);
+    }
+}
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)
+    }
 }
diff --git a/kernel/src/io/vga_text.rs b/kernel/src/io/vga_text.rs
index 34f13a8..fddb3e1 100644
--- a/kernel/src/io/vga_text.rs
+++ b/kernel/src/io/vga_text.rs
@@ -1,3 +1,4 @@
+#[allow(dead_code)]
 #[repr(u8)]
 pub enum Color {
     Black = 0,
diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
index 74daa8a..8d967ad 100644
--- a/kernel/src/lib.rs
+++ b/kernel/src/lib.rs
@@ -10,8 +10,8 @@ extern crate compiler_builtins;
 mod io;
 
 use core::fmt::Write;
-use io::vga_text;
 use io::vga_text::OStream;
+use io::{qemu, serial, vga_text};
 
 #[cfg(test)]
 pub fn test_runner(tests: &[&dyn Fn(&mut OStream)]) {
@@ -26,6 +26,8 @@ pub fn test_runner(tests: &[&dyn Fn(&mut OStream)]) {
 #[test_case]
 fn test01(stdout: &mut OStream) {
     write!(stdout, "running test01 . . . OK");
+    write!(serial::SerialStream::new(), "running test01 . . . OK\n");
+    assert_eq!(0, 1);
 }
 
 #[no_mangle]
@@ -33,16 +35,14 @@ pub extern "C" fn _start() -> ! {
     if cfg!(test) {
         #[cfg(test)]
         test_main();
-        loop {}
+        qemu::exit_qemu(qemu::QemuExitCode::Success);
     }
 
-    let mut stdout = vga_text::OStream::new();
+    let mut stdout = OStream::new();
     stdout.clear();
 
     write!(&mut stdout, "hello world!");
 
-    // panic!("i has panicing");
-
     core::iter::successors(Some(0), |n| Some(n + 1))
         .for_each(|n| write!(&mut stdout, "hello world {}!", n).unwrap());
 
@@ -52,7 +52,7 @@ pub extern "C" fn _start() -> ! {
 #[panic_handler]
 #[no_mangle]
 pub extern "C" fn panic_handler(_info: &core::panic::PanicInfo) -> ! {
-    let mut stderr = vga_text::OStream::new();
+    let mut stderr = OStream::new();
     stderr.set_state(vga_text::CharState::from_colors(
         vga_text::Color::LightRed,
         vga_text::Color::Red,
@@ -75,5 +75,9 @@ pub extern "C" fn panic_handler(_info: &core::panic::PanicInfo) -> ! {
         vga_text::Color::Red,
     ));
     stderr.print_centered(text.as_bytes());
+    if cfg!(test) {
+        write!(serial::SerialStream::new(), "Testing failed\n");
+        qemu::exit_qemu(qemu::QemuExitCode::Failed);
+    }
     loop {}
 }
-- 
cgit v1.2.3-54-g00ecf