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;
+}
+
+

kernel/drivers/serial/serial.h

@@ -1,19 +1,29 @@
 #pragma once
+// For now these are the standard
+// serial ports we can talk to
+enum SERIALPORT {
+    COM1 = 0x3F8,
+    COM2 = 0x2F8,
+    COM3 = 0x3E8,
+    COM4 = 0x2E8
+};
 
-class Serial {
+struct SerialConfig {
+    SERIALPORT port;
+    char baud_rate_lo ;
+    char baud_rate_hi;
+};
+
+
+class Serial   {
 
     public: 
-        static Serial init();
-        
-        void print();
+        Serial (SerialConfig config );
 
-    private: 
-        const int COM1 = 0x3F8;
-        const int COM2 = 0x2F8;
-        const int COM3 = 0x3E8;
-        const int COM4 = 0x2E8;
+        char read();
+        void write(void* data, int length);
 
-
-        Serial();
-        ~Serial();
+    private:
+        SERIALPORT port;
+        int is_transmit_empty();
 };