GDT_ENTRY_BOOT_CS   18 arch/x86/include/asm/segment.h #define __BOOT_CS		(GDT_ENTRY_BOOT_CS * 8)
GDT_ENTRY_BOOT_CS   20 arch/x86/include/asm/segment.h #define GDT_ENTRY_BOOT_DS	(GDT_ENTRY_BOOT_CS + 1)
GDT_ENTRY_BOOT_CS   23 arch/x86/include/asm/segment.h #define GDT_ENTRY_BOOT_TSS	(GDT_ENTRY_BOOT_CS + 2)