Update some docs and add a little more code to main

kernel/src/graphics/writer.rs

@@ -1,3 +1,6 @@
+//! Formerly called ascii.rs, this file defines helper functions for drawing
+//! characters to the screen.
+
 use core::fmt;
 use spin::{Lazy, Mutex};
 use x86_64::instructions::interrupts;
@@ -219,7 +222,7 @@ macro_rules! println_log {
 
 #[macro_export]
 macro_rules! print_log {
-    ($($arg:tt)*) => ($crate::_print_log(format_args!($($arg)*)));
+    ($($arg:tt)*) => ($crate::graphics::writer::_print_log(format_args!($($arg)*)));
 }
 
 #[macro_export]