GCPU_SEL
setsegment(&ci->ci_gdt[GCPU_SEL].sd, ci,
setsegment(&ci->ci_gdt[GCPU_SEL].sd, ci,
setsegment(&gdtstore[GCPU_SEL].sd, &cpu_info_primary,
tss->tss_fs = GSEL(GCPU_SEL, SEL_KPL);
movl $GSEL(GCPU_SEL, SEL_KPL),%eax ; \