feat: io: serial & console

kernel/include/io.h

@@ -0,0 +1,18 @@
+static inline void outb(unsigned short port, unsigned char val) {
+    __asm__ volatile( 
+        "outb %0, %1" 
+        : 
+        : "a"(val), 
+        "Nd"(port) );
+}
+
+static inline unsigned char inb(unsigned short port) {
+    unsigned char ret;
+    __asm__ volatile(
+        "inb %1, %0"
+        : "=a"(ret)
+        : "Nd"(port)
+    );
+
+    return ret;
+}