Data processing system for utilizing a memory-mapped...

Details Data processing system for utilizing a memory-mapped... Data processing system for utilizing a memory-mapped...

G - Physics

06

F

354/230

G06F 12/06 (2006.01)

Patent

CA 1312958

DATA PROCESSING SYSTEM FOR UTILIZING A MEMORY-MAPPED COPROCESSOR WITHIN A LIMITED ADDRESS SPACE ABSTRACT A data processing system is disclosed which permits the use of a memory mapped floating point coprocessor or other such peripheral, by a process which is unable to ad- dress the peripheral's resident memory location but which is able to address a specified location. Memory mapping means intercept attempted accesses by the process to the specified location and diverts the process's access in- struction to cause it to access the corresponding mapped address instead. An illustrative implementation is also described, namely the use of a *Weitek 1167 memory-mapped, floating point coprocessor by processes running in the "virtual mode" of an Intel 80386 CPU. *Trade-mark

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