System and method for performing more efficient window context s

Details System and method for performing more efficient window context s System and method for performing more efficient window context s

1995-04-19

1997-12-02

Ton, Dang

Boots, shoes, and leggings

395842, G06K 1500

Patent

active

056943334

ABSTRACT:
A system and method for performing more efficient hardware context switches in a computer-controlled instrumentation system including a computer system which controls a plurality of instruments. The instrumentation system includes a direct memory access transfer device which performs various data transfers between the computer system and the various instruments. The system also includes a plurality of processes executing in the computer system which operates through a common window to map cycles onto the instrumentation bus to the various instruments. Each process or thread executing on the CPU requires a specific context, and the DMA transfer device automatically configures itself to different contexts in parallel with operating system context changes. Each process includes corresponding context information stored in memory. When the operating system is invoked to switch in a new process on the CPU, the operating system writes the address of the context information to the DMA transfer device. The DMA transfer device reads the context from memory and automatically configures itself in parallel with context changes performed by the operating system.

REFERENCES:
patent: 5428779 (1995-06-01), Allegrucci et al.
patent: 5479441 (1995-12-01), Tymes et al.
patent: 5495522 (1996-02-01), Allen et al.
MC689440, Dual-Channel Direct Memory Access Controller, Motorola Semiconductor Products Inc., Austin, Texas, Feb., 1984, pp. 1-10 through 8-4, Foldout 1-8.

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