Multiple I/O bus virtual broadcast of programmed I/O instruction

Details Multiple I/O bus virtual broadcast of programmed I/O instruction Multiple I/O bus virtual broadcast of programmed I/O instruction

1987-04-13

1989-08-08

Williams, Jr., Archie E.

Boots, shoes, and leggings

G06F 300, G06F 900, G06F 1320

Patent

active

048558990

ABSTRACT:
A method of performing an input/output process containing a programmed input/output (PIO) instruction in a multiprocessor system including at least two processors each having an associated I/O bus with I/O devices connected thereto. The method has the steps of storing a unique address and a bus location for each I/O device in a device location table, determining the address of a referenced I/O device prior to performing the PIO instruction, reading the corresponding I/O bus location of the referenced I/O device from the device location table and executing the input/output process on the prescribed processor associated with the I/O bus to which the referenced I/O device is located. The method is used in conjunction with a task scheduler including a process control block for each scheduled process. When the PIO instruction references a device on the local I/O bus, the input/output process is executed normally. To execute the input/output process on a remote processor, a locked descriptor identifying the remote processor is placed in the process control block for that process. The input/output process is then scheduled for execution on the remote processor.

REFERENCES:
patent: 3938098 (1976-02-01), Garlic
patent: 4665482 (1987-05-01), Murray et al.
patent: 4672537 (1987-06-01), Katzman et al.
patent: 4707693 (1987-11-01), Hessel

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