reimplements the gdt

kernel/arch/gdt/gdt_entry.c

@@ -0,0 +1,19 @@
+#include <kernel/x86/gdt.h>
+
+uint64_t create_descriptor(uint32_t base, uint32_t limit, uint16_t flag)
+{
+	uint64_t descriptor;
+
+	descriptor = limit & 0x000F0000;
+	descriptor |= (flag << 8) & 0x00F0FF00;
+	descriptor |= (base >> 16) & 0x000000FF;
+	descriptor |= base & 0xFF000000;
+
+	descriptor <<= 32;
+
+	descriptor |= base << 16;
+	descriptor |= limit & 0x0000FFFF;
+
+	return descriptor;
+}
+