Implemented serial driver

kernel/include/serial.h

@@ -0,0 +1,19 @@
+#ifndef _SERIAL_H
+#define _SERIAL_H
+
+#include <kernel.h>
+
+#define COM1	0x3f8
+#define COM2	0x2f8
+#define COM3	0x3e8
+#define COM4	0x2e8
+
+int  serial_init(int dev);
+int  serial_txem(int dev);
+void serial_send(int dev, char data);
+int  serial_rcvd(int dev);
+char serial_recv(int dev);
+void serial_write(int dev, char* buf, size_t len);
+void serial_print(int dev, char* s);
+
+#endif

kernel/include/system.h

@@ -0,0 +1,16 @@
+#ifndef _SYSTEM_H
+#define _SYSTEM_H
+
+#include <kernel.h>
+
+void cpuid(uint32_t* eax, uint32_t* ebx, uint32_t* ecx, uint32_t* edx);
+
+// Ports
+uint8_t  inb(uint16_t port);
+void     outb(uint16_t port, uint8_t data);
+uint16_t inw(uint16_t port);
+void     outw(uint16_t port, uint16_t data);
+uint32_t inl(uint16_t port);
+void     outl(uint16_t port, uint32_t data);
+
+#endif