Send output to the serial port, rather than the video display

Signed-off-by: SlyMarbo <[email protected]>

Author: SlyMarbo

kernel/Cargo.toml

@@ -32,9 +32,8 @@ test-args = [
 run-command = [
 	"qemu-system-x86_64",
 	"-drive", "format=raw,file={}",
-	"-device", "e1000,mac=01:23:45:67:89:ab",
-	"-m", "128M",
-	"-cpu", "Haswell"
+	"-serial", "stdio",
+	"-display", "none"
 ]
 
 [[test]]

kernel/src/lib.rs

@@ -17,7 +17,6 @@ pub mod interrupts;
 pub mod memory;
 pub mod serial;
 pub mod time;
-pub mod vga_buffer;
 
 /// init sets up critical core functions of the kernel.
 ///

kernel/src/serial.rs

@@ -26,6 +26,27 @@ pub fn _print(args: ::core::fmt::Arguments) {
     });
 }
 
+/// print! is the standard printing macro, implemented
+/// using the _print function, which acquires SERIAL1
+/// using a spin lock and writes the message to the
+/// serial port.
+///
+#[macro_export]
+macro_rules! print {
+    ($($arg:tt)*) => ($crate::serial::_print(format_args!($($arg)*)));
+}
+
+/// println! is the standard printing macro, implemented
+/// using the _print function, which acquires WRITER
+/// using a spin lock and writes the message to the
+/// VGA display.
+///
+#[macro_export]
+macro_rules! println {
+    () => ($crate::print!("\n"));
+    ($($arg:tt)*) => ($crate::print!("{}\n", format_args!($($arg)*)));
+}
+
 /// serial_print! prints to the host through
 /// the serial interface.
 ///