Data processing system comprising a memory access controller which is provided for combining descriptor bits of different descriptors associated with virtual addresses

摘要

A technique for changing attributes and/or permission bits of a portion of a segment of a virtual memory address space by allowing the bitwise combination of attribute and/or permission bits of its descriptors to yield an attribute and/or permission for a portion of said address space which is different from the attribute and/or permission for the whole segment of said memory address space.