work on tss descriptor

kernel/arch/gdt.cc

@@ -1,6 +1,7 @@
 #include "gdt.h"
 
 #include "core.h"
+#include "tss.h"
 
 namespace GDT {
 
@@ -30,6 +31,11 @@ alignas(16) constinit SegmentDescriptor long_mode[] = {
 	// Global data segment
 	SegmentDescriptor::Segment64(false, 0),
 
+	SegmentDescriptor::Segment64(true , 3),
+	SegmentDescriptor::Segment64(false, 3),
+
+	//SegmentDescriptor::TSSLow(),
+	//SegmentDescriptor::TSSHigh(),
 };
 extern "C" constexpr Pointer gdt_long_mode_pointer(long_mode);