Created a proper driver for the serial bus

* The driver can write to any of the pre-defined serial COM ports
* The driver can read from any of the pre-defined serial COM ports (Untested)

kernel/drivers/serial/serial.cpp

@@ -1,19 +1,52 @@
 #include "serial.h"
+#include "../../io/io.h"
 
-Serial Serial::init() {
-    // No clue what to setup yet!
+// Initializes communication according to the spec given
+Serial::Serial(SerialConfig config) {
+    port = config.port;
+    // Disable interrupts
+    outb(config.port + 1, 0x00);
 
-    return Serial();
+    // Enable DLAB
+    outb(config.port + 3, 0x80);
+
+    // set the baudrate
+    outb(config.port + 0, 0x03);
+    outb(config.port + 1, 0x00);
+
+    // configure for 8bits, no parity, one stop bit
+    outb(config.port + 3, 0x03);
+
+    // Enable FIFO, clear them, with 14-byte threshhold
+    outb(config.port + 2, 0xC7);
+    // Enable IRQ's, RTS/DSR set
+    outb(config.port + 4, 0x0B );
+    // Set in loopback mode, test the serial chip.
+    outb(config.port + 4, 0x1E);
+
+    // TEST
+    outb(config.port + 0 , 0xAE);
+
+    if(inb(config.port + 0) != 0xAE)
+        return ; // FAIL
+
+    outb(config.port + 4, 0x0F);
+    return ;
 }
 
-void Serial::print(){
-    // Do nothing!
+void Serial::write(void* data, int len) {
+    while (is_transmit_empty() == 0); // Wait for transmit queue to be free
+    for (int i = 0; i < len ; i++){
+        outb(port, ((uint8_t*)data)[i]);
+    }
 }
 
-Serial::Serial(){
-    // Do nothing!
+char Serial::read() {
+    return inb(port);
 }
 
-Serial::~Serial(){
-    // Do nothing!
-}
+int Serial::is_transmit_empty() {
+    return inb(port + 5) & 0x20;
+}
+
+