1. A computer program product for enabling adapters in a computing environment, said computer program product comprising: a computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising: responsive to executing a Call Logical Processor (CLP) instruction for enabling an adapter, the CLP instruction comprising a function handle identifying the adapter and having an adapter not enabled indicator, the CLP instruction requesting a number of direct memory access (DMA) address spaces, the execution enabling one or more DMA address spaces comprising a) and b): a) enabling the adapter, wherein the enabling comprises enabling registration for address translation and interruptions for supporting direct memory accesses and message signaled interruptions for the adapter; and b) returning the function handle having an adapter enabled indicator.