separating: there will be libk and libc

drivers/serial.h

@@ -0,0 +1,18 @@
+// Serial I/O driver header
+// Author: xamidev
+// Licensed under the Unlicense. See the repo below.
+// https://github.com/xamidev/blankos
+
+#ifndef SERIAL_H
+#define SERIAL_H
+
+#define PORT 0x3f8 //COM1
+
+int init_serial();
+int is_transmit_empty();
+void write_serial(const char a);
+void serial_puts(const char* str);
+void log(const char* str, const int errlevel);
+void serial_printf(int errlevel, const char* fmt, ...);
+
+#endif