Register/saving/restoring system for saving and restoring data i

Details Register/saving/restoring system for saving and restoring data i Register/saving/restoring system for saving and restoring data i

1987-03-24

1989-07-25

Eng, David Y.

Boots, shoes, and leggings

3642283, 3642670, 3642304, 364968A, G06F 1516, G06F 1300, G06F 900

Patent

active

048519928

ABSTRACT:
A register saving/restoring system for use in a data processing system is constructed of a CPU and at least one slave processors. The registers of the slave processors are not saved nor restored when the CPU switches tasks, however the descriptor of the task carried out in one slave processor most recently and the descriptor of a task being executed by the CPU are compared so that the slave processor registers are saved and restored. This process is done only if the descriptors are different, in order to avoid the waste register saving/restoring processing.

REFERENCES:
patent: 3643227 (1972-02-01), Smith et al.
patent: 4096564 (1978-06-01), Inose et al.
patent: 4333144 (1982-06-01), Whiteside et al.
patent: 4394730 (1983-07-01), Suzuki et al.
patent: 4414624 (1983-11-01), Summer, Jr. et al.
patent: 4430707 (1984-02-01), Kim
patent: 4685125 (1987-08-01), Zave
patent: 4736318 (1988-04-01), Delyani et al.

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