GNULL_SEL 136 arch/i386/i386/gdt.c gdt_free = GNULL_SEL; GNULL_SEL 236 arch/i386/i386/gdt.c if (gdt_free != GNULL_SEL) { GNULL_SEL 107 arch/i386/i386/vm_machdep.c p2->p_md.md_tss_sel = GSEL(GNULL_SEL, SEL_KPL);