Multi OS configuration method and computer system

• US 20040237086A1
• Filed: 06/29/2004
• Published: 11/25/2004
• Est. Priority Date: 09/12/1997
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Shibata, Takashi, Inoue, Taro, Ohno, Hiroshi, Arai, Toshiaki, Sekiguchi, Tomoki, Kaneko, Shigenori
• Granted Patent: US 7,712,104 B2
• Time in Patent Office: Days
• US Class Current: 718/100
• CPC Class Codes: G06F 11/261 by simulating additional hardware, e.g. fault simulation
• CPC Class Codes: G06F 9/45537 Provision of facilities of other operating environments, e.g. WINE I/O emulation G06F13/105
• CPC Class Codes: G06F 9/4843 by program, e.g. task dispatcher, supervisor, operating system

Abstract

A computer system of a multi-operation-system (multi-OS) has a main memory having a memory area for a first OS and a memory area for a second OS, both the areas being independent from each other, and a plurality of I/O devices divisionally allocated to the first OS and the second OS. The first OS is loaded in the first OS memory area, and thereafter when the first OS is operated, the second OS is loaded in the second OS memory area and initialized. When the first OS is operated, the first OS hardware resources and the second OS hardware resources are registered by the first OS. Thereafter when the first OS is operated, the first OS inhibits the registration of an interrupt number already allocated to the second OS I/O device. In response to an interrupt request from a second OS I/O device, the second OS starts operating.

Claims

1-18. -18. (Canceled)

19. A computer comprising:

a processor;

a memory; and

an external device,

wherein said processor executes a first operating system and a second operating system;

said processor configures a virtual memory space managed by the second operating system at a predetermined section of a file constituting the first operating system, thereby to make the virtual memory space be referable also by the second operating system; and

said processor executes the second operating system by using the predetermined section of the file.

20. The computer according to claim 19, wherein the file is an object file executed by said processor in order that said processor controls said external device of said computer.

21. The computer according to claim 20, wherein said processor allocates a predetermined section of the object file to the virtual memory space managed by the second operating system.

22. The computer according to claim 21, wherein the predetermined section of the object file is a section executed by said processor when said processor processes an interrupt signal transmitted from said external device managed by the object file.

23. The computer according to claim 22, wherein information concerning the predetermined section of the object file is stored in a header of the object file.

24. The computer according to claim 19, wherein the virtual memory space is a common area referable by both the first and second operating systems, but the remainder of the file exclusive of the virtual memory space is referable by the first operating system only.

25. The computer according to claim 24, wherein said remainder of the file exclusive of the virtual memory determines physical memory allocation, I/O resource reservation, and interrupt level management.

26. The computer according to claim 24, wherein the virtual memory space includes an interrupt table, an interrupt handler, and an operating system context table storing data for switching between the first operating system and the second operating system.

27. The computer according to claim 19, wherein the processor configures the virtual memory space by a compiler.

28. The computer according to claim 27, wherein in configuring the virtual memory space, the compiler forms a page table that allows the second operating system to access only a particular address range of the file.