US 6,715,016 B1Granted

Multiple operating system control method

AssigneeHitachi, Ltd.

InventorsHiroshi Ohno, Tomoaki Nakamura, Shigenori Kaneko, Ryokichi Yoshizawa, Naoshi Kato, Manabu Yamauchi, Toshiaki Arai, Tomoki Sekiguchi

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Abstract

An inter-OS control software for switching OS's in operation executed on a single CPU is installed, and plural OS's are made alternately executed. A control program is executed exclusively on one OS, which controls the controlled apparatus. A supervisory control program and a development environment program are executed on another OS, and a memory space is divided so as to make no effect for the operation of the control program. A higher real-time performance and reliability can be established with a single CPU architecture.

Claims9

Dependent claims

A multiple operating system control method for a multiple operating system having plural operating systems executed in a digital arithmetic processor and including a first operating system and a second operating system and a plurality of pieces of hardware, each piece of hardware assigned to a corresponding operating system, comprising:

assigning interrupt numbers to respective pieces of hardware and storing them in a table so as to maintain the operating systems independent from each other;
alternately switching, under inter-operating system control software control, on the basis of said table, between and said first and second operating systems to alternately execute said first and second operating systems;
and
reserving an interrupt number or an input and output address used by said second operating system for said first operating system when starting said first operating system.

1 more element

Dependencies are inferred from the claim text.