GPANIC_SEL
setidt(IDT_DF, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL,
gdt[GPANIC_SEL].sd.sd_lobase = (int)dblfault_tss;
gdt[GPANIC_SEL].sd.sd_hibase = (u_int)dblfault_tss >> 24;