1. A method, in a data processing system, for accessing a memory location in a physical memory of the data processing system, comprising: receiving a request from an application to access a memory location specified by an effective address in an application address space; performing, at a user level of execution, a translation of the effective address to a real address table index (RATI) value corresponding to the effective address; performing, at a hardware level of execution, a lookup operation of the RATI value in a real address table data structure maintained by trusted system level hardware of the data processing system, to identify a real address for accessing physical memory; and accessing a memory location in physical memory based on the identified real address.