Method and apparatus for handling interrupts through the use of

Details Method and apparatus for handling interrupts through the use of Method and apparatus for handling interrupts through the use of

1998-06-19

2000-09-05

Auve, Glenn A.

Electrical computers and digital data processing systems: input/

Interrupt processing

262269, G06F 1324

Patent

active

061157783

ABSTRACT:
A control system comprises an interrupt controller, having vector access signal output mechanism for outputting a vector access signal, which is activated when a start address is read out from a vector holder, and a central processing unit (CPU), comprising a present mask holder, which holds a present mask level, and a previous mask holder, which holds a previous mask level, wherein the CPU compares the interrupt level and the present mask level, and, when the interrupt level is higher than the present mask level, copies a value of the present mask level holder into the previous mask level holder, reads out a start address of an interrupt processing program corresponding to an accepted interrupt request from the vector holder, starts executing the interrupt processing program, and copies the interrupt level into a present mask level holder by means of an activated vector access signal.

REFERENCES:
patent: 5349667 (1994-09-01), Kaneko
patent: 5590380 (1996-12-01), Yamada et al.
patent: 5594905 (1997-01-01), Mital
patent: 5603035 (1997-02-01), Erramoun et al.
patent: 5659759 (1997-08-01), Yamada
Tanenbaum, Structured Computer Organization, 1990, pp. 11-13.

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