In reply to csc57:
This is what the UVM library is saying:
//------------------------------------------------------------------------------
//
// Title: Memory Allocation Manager
//
// Manages the exclusive allocation of consecutive memory locations
// called ~regions~.
// The regions can subsequently be accessed like little memories of
// their own, without knowing in which memory or offset they are
// actually located.
//
// The memory allocation manager should be used by any
// application-level process
// that requires reserved space in the memory,
// such as DMA buffers.
//
// A region will remain reserved until it is explicitly released.
//
//------------------------------------------------------------------------------