stos+amd64: Add serial logging + trace facility

Signed-off-by: Chloe M. <chloe@mensia.org>

paw/stos/init/init.c

@@ -6,9 +6,26 @@
  * Author:       Chloe M.
  */
 
+#include <ex/trace.h>
+#include <hal/serial.h>
 #include <stdef.h>
 
+/*
+ * Display a boot banner
+ */
+static VOID
+BootBanner(VOID)
+{
+    TRACE("Machine has been turned on~\n");
+    TRACE("Booting SystemPaw3 !! <3\n");
+}
+
 VOID
 KiKernelEntry(VOID)
 {
+    /* Initialize the serial driver */
+    HalSerialInit();
+
+    /* Write the boot banner */
+    BootBanner();
 }