1. A method of mapping a memory instruction to a shared memory address space in a computer arrangement configured for unified operation between a central processing unit (CPU) and an accelerated processing device (APD), comprising: receiving the memory instruction, wherein the memory instruction refers to an address in the shared memory address space; mapping the memory instruction to a memory resource based on the address, wherein the memory resource is associated with at least one of the CPU and the APD; and sending information corresponding to the mapping to the processor.