JPH08339303A - Os switching device - Google Patents

Abstract

PURPOSE: To provide an OS switching device which can perform an OS switching operation without using a power supply ON/OFF procedure and with addition of a small number of processing functions. CONSTITUTION: A partition A where plural loaders A/J are included is provided with a common loader 2 which reads the written loader codes out of a loader designation area 31 of a BUM (back-up memory) 3 where the OS information included in the commands are written. The OS information on the OS switching command includes the designation of a loader that loads the switching destination OS. The OS switching command is received and the OS information included in the command is written in the BUM 3. If the switching destination shows an OS-A under such conditions, a loader A (J) code to be designated is written in the area 31. Then an access is given to the loader 2 of the partition A of a disk device 1 based on the OS which is read out of the OS information on the BUM 3. As a result, the loader 2 has an access to the loader A (J) that is designated in the area 31 and the OS-A can be loaded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a large-capacity memory device of a system having a plurality of areas (hereinafter referred to as partitions) divided for each OS (operating system).
The present invention relates to an OS switching device when a plurality of loaders are mixed in the same partition, and more particularly to an OS switching device capable of OS switching without a power-off / power-on procedure.

[0002]

2. Description of the Related Art Conventionally, in this type of OS switching device, an operator once temporarily changes the OS mode of a system.
If the OS mode initially set in the system is different after the system is turned off, the OS is selected by calling the mode selection screen by turning on the power while pressing down a specific key.

After the power is turned off, the power is turned back on to restart the OS.
A technique for improving the troublesomeness of selecting a mode is disclosed in, for example, Japanese Patent Laid-Open No. 5-274120. The large-capacity memory device here is a magnetic disk device.

In this OS switching device, the OS mode is automatically designated by the operator executing a command corresponding to the designated OS mode. That is, the command input by the operator includes the position information of the partition in which the specified OS is registered, and this OS information is BUM (backup memory).
Written in. Next, the written OS information is read, the mode of the OS to be booted is determined from this OS information, the partition management information on the magnetic disk is accessed, and the OS partition position is specified. Is loaded.

[0005]

In the above-mentioned conventional OS switching device, the system to be constructed is complicated. For example, when the same machine is operated in a plurality of different systems such as a stand-alone system and a workstation system, It is necessary to have multiple loaders corresponding to multiple systems in the same partition.
Despite this, the OS information contains only the partition position. In this configuration, only one loader can exist in one partition to achieve the function only by designating the OS, and when multiple OSs are booted from the same partition, power is turned off / on and There is a problem that the operator needs to specify the menu.

An object of the present invention is to provide an OS switching device which is provided with a plurality of loaders and solves the above problems in the case of booting a plurality of OSs from the same partition, and which can switch the OS without the procedure of turning off / on the power. It is to be.

[0007]

An OS switching device according to the present invention has a plurality of partitions in a large-capacity memory device of a system, and an OS switching command when a plurality of loaders are mixed in the same partition. When the OS switching command is received, it is confirmed that there is a plurality of loaders in the partition of the specified OS, and then the specified loader is loaded into the specified loader. It has a function to access.

Further, a common loader for reading the written OS information by referring to the BUM in which the OS information included in the command is written is provided in a partition in which a plurality of loaders coexist, and a plurality of loaders are installed in the partition. Confirmation of this is based on access to the common loader based on the specified OS.

As a concrete means for this, a common loader is provided in a partition in which a plurality of loaders are mixed, and the OS information of the OS switching command includes designation of a loader for loading the switching destination OS. When receiving, the OS information included in the OS switching command is first written in the corresponding area of the BUM, the loader of the partition corresponding to the OS of the OS information is accessed, and the accessed loader is the common loader. In this case, the common loader reads the specified loader from the OS information written by referring to the BUM and accesses it.
Has the ability to load.

[0010]

Next, the present invention will be described with reference to the drawings. Here, the OS switching device is provided with various memory means and various processing means, and the large-capacity memory device is a disk device of ROM (read only memory).

FIG. 1 is an explanatory diagram showing an embodiment of a memory area according to the present invention.

Of the OS switching devices, the disk device 1 shown in FIG. 1A is provided with a plurality of partitions A, B, ... As areas divided by OS-A, B ,. Be present. Partition A has O
It is assumed that there are areas for S-A, loaders A and J, and common loader 2, and that partition B has areas for OS-B and loader B.

The common loader 2 is provided for each of the two loaders A and J in the partition A, and the OS to be switched is loaded into the OS information included in the command input by the operator. It is assumed that one of the plurality of loaders A and J is designated.

The BUM3 of the OS switching device has an area for writing OS information input by a command.
In the information area, there is a loader specification area 31 in which a 1-byte loader is specified, as shown in FIG. In this loader designation area 31, when one partition has a plurality of loaders, the loader to be selected is designated. For example, in the case of partition A, reference numeral 00 indicates no loader designation, reference numeral 01 designates the loader A, and reference numeral 02 designates the loader J.

When the partition A is accessed based on the switching destination OS-A, the common loader 2 is first read, and the common loader 2 reads the designated loader from the loader designation area 31 of the BUM 3.

Next, referring to FIG. 1 and FIG. 2 together, an operation procedure from the input of the mode switching command of the OS to the loading of the switching destination OS will be described.

First, when the OS mode switching command issued by the operator is input (procedure S1), the processing means sets the O specified in the command in the corresponding area of the BUM3.
Write S information (step S2). At this time, when there are a plurality of loaders A and J for the partition A, for example, when the loader A is designated, the code 01 is written in the loader designation area 31.

Next, the processing means accesses the disk device 1 which is a ROM (step S3), initializes the hardware to be written (step S4), and changes the switching destination according to the OS information written in the BUM3. Know the OS partition and access the loader of this partition (step S5).

When the switching destination is OS-A, the access destination is the common loader 2 of partition A (YES in step S6). The common loader 2 is the loader designation area 31 of the BUM 3.
, The reference numeral 01 of the designated loader A is taken out, and the OS information stored in step S2 is deleted (step S
7) Do. As a result of the processing means accessing the loader A designated by the extracted code 01 (step S8),
The loader A loads the OS-A designated by the operator into a predetermined area (step S9).

On the other hand, when the switching destination is OS-B, the access destination is the loader B of the partition B, and the step S6 is "NO". In this case, the OA-B is loaded by the loader B to the step S9. move on.

In the above description, the loader A is designated. However, if another loader J is designated, it goes without saying that the loader J is accessed and the loader J loads the OS-A. is there. Further, in the above description, only the part to be changed from the conventional one is limited and illustrated, but the above description does not limit the present invention.

[0022]

As described above, according to the present invention, O
The OS information of the S switching command includes the designation of the loader for loading the switching destination OS, and when the OS switching command is received, after confirming that there are a plurality of loaders in the partition of the designated OS, the designated loader By providing the function of accessing the OS, it is possible to obtain an OS switching device capable of switching the OS without the procedure of turning off / on the power.

Further, a common loader for reading the written OS information by referring to the BUM in which the OS information included in the command is written is provided in a partition in which a plurality of loaders coexist, and a plurality of loaders are installed in the partition. To confirm that there is, by accessing the common loader based on the specified OS, the processing function of the common loader and the processing function of selecting one from a plurality of loaders are simplified, and a small amount of processing function is added. It is possible to obtain an OS switching device that can be realized by.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a memory area according to the present invention.

FIG. 2 is a flow chart showing an embodiment of the present invention.

[Explanation of symbols]

 1 disk device (large-capacity memory device) 2 common loader 3 BUM (backup memory) 31 loader specified area

Claims (3)

[Claims] 1. An OS switching device in which a large-capacity memory device of a system has a plurality of areas (hereinafter referred to as partitions) divided for each OS (operating system) and a plurality of loaders are mixed in the same partition. The OS information of the switching command includes the designation of the loader for loading the switching destination OS, and when the OS switching command is received, after confirming that there are a plurality of loaders in the partition of the designated OS, the designated loader An OS switching device having a function of accessing the OS. 2. A partition in which a plurality of loaders coexist as a common loader for reading OS information written by referring to a BUM (backup memory) in which OS information included in a command is written. In preparation for the above, the OS switching device is characterized in that the confirmation that the partition has a plurality of loaders is made by accessing the common loader based on a designated OS. 3. An OS switching device having a plurality of partitions in a large-capacity memory device of a system, wherein a plurality of loaders coexist in the same partition, and a partition having a plurality of loaders provided with a common loader and OS switching. The OS information of the command includes the designation of the loader for loading the switching destination OS, and when the OS switching command is received, first, the OS information included in the OS switching command is set to B.
When the loader that has accessed is the common loader, the common loader writes B to the corresponding area of the UM and accesses the loader of the partition corresponding to the OS of the OS information.
An OS switching device having a function of reading and accessing a loader designated from OS information written by referring to UM and loading the OS by the loader.