JPS62217326A - Computer capable of storing and switching plural os - Google Patents

Abstract

PURPOSE:To attain the restart of processing of plural OS at a time point when they are discontinued again after they are switched to other OS and executed, by performing the exchange among the memory areas having the same address and therefore discontinuing these OS at an optional time point. CONSTITUTION:The input/output devices 16 and 17 set the corresponding FF out of those of an FF group 18 when the input/output instructions are accepted and then reset them at the time of said input/output instructions are over. A switch means 12 validates a memory area 15 and a status register 21 and stores the hardware information on a program counter, a register, a flag, etc., which are under execution in the register 21 in case a switch request is produced to another OS 2 during execution of an OS 1 out of plural OS. If a switch request is given again to the OS 1 during execution of the OS 2, the program counter, etc., are stored in a status register 20 and then switched to a memory area 15 and the register 21 after all FF of the group 18 are reset.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a computer, and more particularly to a system in which a plurality of OSs are stored and are switched according to instructions to execute -ωS at the same time.

[Conventional technology]

Conventionally, there have been the following methods for switching and executing multiple OSs with one CPU.

(1) Method of reloading the OS.

(2) A system that stores multiple operating systems in memory and has a supervisor program that switches between them.

[Problem that the invention seeks to solve]

In the conventional (1)08 reload method described above, switching takes time. Furthermore, when returning to the original OS after switching to another OS, there is a drawback that it is not possible to return to the state before switching because there is no information about the entire target OS. Also, (2) the number of supervisors is O
In the method of switching S, for example, the processing of a supervisor who analyzes an interrupt vector and passes control to the currently executing OS becomes complicated. Furthermore, there is a drawback that the structure of the OS is different from the OS when used alone, such as the interrupt vector analysis section being different.

An object of the present invention is to provide a computer capable of storing and switching multiple OSs, which can suspend multiple OSs at any time and resume processing from the point of suspension by switching memory areas having the same address range. It is in.

[Means for solving problems]

The configuration of the computer capable of storing multiple OSs and switching according to the present invention is as follows:
In a computer system equipped with a memory having the same address band and a plurality of input/output devices, a switching means for switching a plurality of memory areas in the same address band of the memory, and storing information on the hardware being executed corresponding to each memory area. and a group of flip-flops for storing that the input/output device is performing an input/output operation,
The stored hardware information is set, and while one of the plurality of OSs respectively stored in the memory area for the number of seconds is running, a request for switching to another OS is stored in the means, and at this time, the input/output information is stored in the means. If any of the devices is in operation, each of the flip-flops in the group of flip-flops is set, and when the operation is completed, each flip-flop is reset, and the switching means is set to the flip-flop that is currently being executed. Switching a memory area and the storage means corresponding to this memory area to a memory area in which another OS is stored and the storage means corresponding to this memory area, and storing data in the storage means before this switching. interrupting the plurality of OSs at any point during execution by setting the hardware information and executing the OS after the injection;
The feature is that after executing another OS, the process of the interrupted OS is resumed.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In FIG. 1, one embodiment of the present invention includes a plurality of input/output devices 16 and 17, one CPU II, and a different OS for each.
Memory 3o has multiple memory areas with the same address range for storing information, and when the OS running in each memory area switches to another, it stores the currently running hardware information and switches to the OS again. means 19 to 21 for resetting the stored hardware and hardware information, a flip-flop group I8 indicating that the input/output device is performing an input/output operation, and means 12 for switching memory areas. have.

The storage means 19 to 21 are status registers for storing the running state, that is, the program counter, various registers, and seven-lag hardware information, and are configured to be switched together with the memory area having the same address band as the switching means 12. has been done.

Various input/output devices x6.17 are 717 when receiving orders for people to leave.
The corresponding flip-flop in the group 18 of 70 chips is set, and when the input/output command is completed, the 7 chips 70 are reset.

When the switching means 12 memory area 15 and the status register 21 are enabled and a request to switch to another OS2 occurs when one of the multiple OSs 081 is running, the program color/register currently being executed is and hardware information such as flags are stored in the status register 21. It's good to know that the power to obtain it is in operation]\6- One or more of the flop group 18 is set.

In this case, in order to wait for the completion of the input/output command, after all of the flip-flops 18 are reset, the switching means 12 stores the memory area 14 and the status register 20.
The program counter and the like previously executed in OS2 are stored, and they are reset and 082 is executed.

If a request to switch to OS1 occurs again while OS2 is running,
The program counter and the like are stored in the status register 20, and after waiting for all the flip-flops 18 to be reset, switching is made to the memory area 15 and the status register 21.

Thereafter, when hardware information such as the program counter, various registers and flags stored in the status register 21 is reset and 081 is executed, the OS1 resumes execution from the operation at the time of switching to the OS2.

In this way, it is possible to interrupt the execution of multiple OSs at any time, run another OS, and then resume processing of the interrupted OS.

The flip-flop group 18 functions to prevent data from being input/output to the wrong memory area when the input/output device switches memories during DMA (direct memory access).

〔Effect of the invention〕

As explained above, the present invention has the advantage of being able to suspend multiple OSs at any point in time by switching memory areas in the same address band, switch to another OS, and then resume processing from the point where it was interrupted again. be.

Moreover, it is possible to prevent malfunctions caused by switching during execution of input/output using DMA (direct memory access).

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. 11...CPLI, 12...Switching means, 13.14°15...Memory area, 16. i
7...Input/output device, 18...Flip-flop group, 19, 20.21...Status register, 30...Memory. [-

Claims (1)

[Claims] In a computer system equipped with a memory having the same address band and a plurality of input/output devices, a switching means for switching a plurality of memory areas in the same address band of the memory, and storing information on the hardware being executed corresponding to each memory area. and a group of flip-flops for storing that the input/output device is performing an input/output operation,
When the stored hardware information is set and a request to switch to another OS occurs while one of the plurality of OSs respectively stored in the plurality of memory areas is being executed, the hardware information currently being executed is storing information in the storage means; if any of the input/output devices is in operation at this time, each corresponding flip-flop of the flip-flop group is set; and when the operation is completed, each flip-flop is reset; Then, the switching means switches the memory area currently being executed and the storage means corresponding to this memory area to the memory area in which the other OA is stored and the storage means corresponding to this memory area; The hardware information stored in the storage means before switching is set and the OS after switching is executed, the plurality of OSs are interrupted at any point during execution, and the other OS is executed. A computer capable of storing and switching a plurality of OSs, characterized in that a computer is capable of storing and switching between multiple OSs, and then resumes processing of an OS that has been interrupted.