add println! and panic! macro

The rust lazy_static requires interior mutability. I have to include a
Mutex impl (spin::Mutex). But I'd like to implement my own primitives.

1 files changed, 34 insertions, 0 deletions

diff --git a/src/io.rs b/src/io.rs
new file mode 100644
index 0000000..988db09
--- /dev/null
+++ b/src/io.rs
@@ -0,0 +1,34 @@
+use crate::machine::cgascr::CGAScreen;
+use core::fmt;
+use lazy_static::lazy_static;
+use spin::Mutex;
+
+// TODO I want my own locking primitive for practice, instead of stock spin lock
+lazy_static! {
+	// TODO perhaps remove the 'a lifetime from the struc defs
+	pub static ref CGASCREEN_GLOBAL: Mutex<CGAScreen> = Mutex::new(CGAScreen::new());
+}
+
+#[macro_export]
+macro_rules! print {
+    ($($arg:tt)*) => ($crate::io::_print(format_args!($($arg)*)));
+}
+
+#[macro_export]
+macro_rules! println {
+    () => ($crate::print!("\n"));
+    ($($arg:tt)*) => (print!("{}\n", format_args!($($arg)*)));
+}
+
+pub fn _print(args: fmt::Arguments) {
+	use core::fmt::Write;
+	CGASCREEN_GLOBAL.lock().write_fmt(args).unwrap();
+}
+
+pub fn clear() {
+	CGASCREEN_GLOBAL.lock().clear();
+}
+
+pub fn set_attr(attr: u8) {
+	CGASCREEN_GLOBAL.lock().setattr(attr);
+}