System for determining adapter interrupt status where interrupt

Details System for determining adapter interrupt status where interrupt System for determining adapter interrupt status where interrupt

1997-10-15

2000-06-20

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral monitoring

709223, 710 15, 710 48, 710260, 710268, 711 2, G06F 1324

Patent

active

060789700

ABSTRACT:
An I/O adapter connects an I/O adapter to an I/O bus and includes a device interrupt status register and an interrupt status shadow address register. The device interrupt status register stores the interrupt status of the I/O adapter. The I/O adapter accesses the interrupt status shadow address register to determine an address of main memory at which the device interrupt status register is shadowed. After shadowing the interrupt status, the I/O adapter interrupts the processor complex which may then access local, main memory to determine the interrupt status. A multifunction I/O adapter permits a plurality of I/O adapters to be connected thereto and includes a function interrupt status register to summarize the interrupt status of all the I/O adapters attached thereto. After shadowing the summarized interrupt status, the multifunction I/O adapter interrupts the processor complex which may then access local, main memory to determine the interrupt status.

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