USEGD_GETBASE
ssd->bo = USEGD_GETBASE(usd);
baseaddr = (caddr_t)(uintptr_t)USEGD_GETBASE(descrp);
baseaddr = (caddr_t)(uintptr_t)USEGD_GETBASE(descrp);
baseaddr = (caddr_t)(uintptr_t)USEGD_GETBASE(descrp);
baseaddr = (caddr_t)(uintptr_t)USEGD_GETBASE(descrp);
*addr += USEGD_GETBASE(desc);
USEGD_GETBASE(&ldt[SELTOIDX(rp->r_ss)]);
ssd->bo = USEGD_GETBASE(usd);