Added:

- TTY driver
- VGA driver
- kernel's main function
- Makefiles

*NOTE*: iceOS not works at this stage.

kernel/drivers/ports.h

@@ -0,0 +1,20 @@
+#ifndef _PORTS_H
+#define _PORTS_H
+
+#include <stdint.h>
+
+/* outb:
+ * Redirect data to port(high level interface for ports.asm)
+ * @param port: Output port to send data to.
+ * @param data: The actual data to send to port
+*/
+void outb(uint16_t port, uint8_t data);
+
+/* inb:
+ * Fetch data from a port, return a char
+ * @param port: Input port to read data from.
+*/
+uint8_t inb(uint16_t port);
+
+
+#endif