Efficient DEBUG logging system with __FILE__ and fctprintf

src/io/serial/serial.h

@@ -5,6 +5,7 @@ void outb(int port, unsigned char data);
 unsigned char inb(int port);
 
 int serial_init();
-void serial_kputs(const char* str);
+void skputs(const char* str);
+void skputc(char c);
 
 #endif