SDT_SYSTSS
tss_desc->sd_type = SDT_SYSTSS;
if (tss_desc->sd_type != SDT_SYSTSS &&
tss_desc->sd_type = SDT_SYSTSS; /* unbusy */
.ssd_type = SDT_SYSTSS,
tss_sd->sd_type = SDT_SYSTSS;
case SDT_SYSTSS:
tss_sd->sd_type = SDT_SYSTSS;