1. A computer system for translating addresses in a computing environment, said computer system comprising: an adapter; and a hardware unit coupled to the adapter, wherein the hardware unit is configured to perform a method, the method comprising: obtaining an address from the adapter to be translated, the address comprising a plurality of bits, the plurality of bits comprising a first portion of bits and a second portion of bits; receiving an address range value that indicates a range of permitted addresses; and converting the address to a memory address usable in accessing memory of the computing environment, the converting ignoring the first portion of bits and using the second portion of bits to obtain address information from one or more levels of address translation tables to perform the converting.