Efficient saving and restoring state in task switching

Details Efficient saving and restoring state in task switching Efficient saving and restoring state in task switching

2005-05-24

2005-05-24

Eng, David Y. (Department: 2155)

Electrical computers and digital processing systems: processing

Processing control

Branching

Reexamination Certificate

active

06898700

ABSTRACT:
The present invention discloses a method and apparatus for saving and restoring registers. A single instruction is decoded. The single instruction moves contents of a plurality of registers associated with a functional unit in a processor to a memory; the processor operates under a plurality of operational modes and operand sizes. The single instruction arranges the contents in the memory according to a predetermined format into a plurality of groups, each group is aligned at an address boundary which corresponds to a multiple of 2Nbytes. The predetermined format is constant for the plurality of operational modes and operand sizes. The single instruction retains the contents of the plurality of registers after moving.

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