sldt
struct soft_segment_descriptor sldt;
sldt.ssd_base = sva;
sldt.ssd_limit = sz - 1;
sldt.ssd_type = SDT_SYSLDT;
sldt.ssd_dpl = SEL_KPL;
sldt.ssd_p = 1;
sldt.ssd_long = 0;
sldt.ssd_def32 = 0;
sldt.ssd_gran = 0;
ssdtosyssd(&sldt, &p->p_md.md_ldt_sd);
ldt_sel = sldt();
ldt_sel = sldt();