Squash commits for public release

boot/x86_64/prekernel/drivers/uart.h

@@ -0,0 +1,15 @@
+#ifndef _BOOT_DRIVERS_UART_H
+#define _BOOT_DRIVERS_UART_H
+
+#include <libboot/types.h>
+
+#define COM1 0x3F8
+#define COM2 0x2F8
+#define COM3 0x3E8
+#define COM4 0x2E8
+
+void uart_init();
+int uart_write(uint8_t data);
+int uart_read(uint8_t* data);
+
+#endif //_BOOT_DRIVERS_UART_H