adds a utility to dump the gdt, adds serial printing for printf in testing

kernel/kmain.c

@@ -8,15 +8,13 @@
 #include <kernel/x86/idt.h>
 #include <kernel/x86/pic.h>
 
-uint64_t gdt[GDT_SIZE];
-
 void kmain(void)
 {
 #ifdef __TESTING__ // important components should be declared first, but if we're testing we want to log all of that
 	terminal_initialize();
 	serial_initialize();
 #endif
-	gdt_init(gdt);		
+	gdt_init();		
 	idt_init();
 	PIC_remap(0x20, 0x28);
 
@@ -24,8 +22,4 @@ void kmain(void)
 	terminal_initialize();
 	serial_initialize();
 #endif
-
-
-	printf("Integer: %1\n", gdt[1]);
-	printf("Hex Int: %x\n", 2);
 }