feat(cpu): add GDT and TSS for ring 0 and ring 3 segments

include/tss.h

@@ -0,0 +1,9 @@
+#ifndef FROSTBYTE_TSS_H
+#define FROSTBYTE_TSS_H
+
+#include "types.h"
+
+void tssInit(uint64 rsp0);
+void tssSetRsp0(uint64 rsp0);
+
+#endif