JPH0444146A - Emulation processing system for input/output controller - Google Patents

Abstract

PURPOSE:To attain the use of an input/output device with no reliance on an operating system OS of a computer system by simulating the operations of the input/output controllers of different control systems at a machine instruction level. CONSTITUTION:A status conversion processing part 22 reads the command end status (state information) of an input/output controller 3 into an end status part 83 and converts the status into the status information on a target computer 4 to store them in a drive status register and a status register of a register area 81 and then to inform a virtual input/output control part 1 of these status information. Based on the received information, the part 1 produces an interruption to a control program 1. The program 1 applies a read access to the part 1 in order to start a command conversion processing part 21. The part 21 transfers the value of the drive status register of the area 81 or the value of the status register to a register part 11. Thus the controller 3 is used with no reliance on an OS.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to an emulation processing method for input/output control devices, and is capable of emulating input/output control devices with different control methods, regardless of the specific input/output control method used by a computer system. The purpose is to enable use in a computer system, and it has a virtual input/output control section, an emulation processing section, an input/output control device, and a target computer, and the emulation processing section has a command conversion processing section and a command conversion processing section. The virtual input/output control unit provides an interface for sending and receiving input/output access information between the target computer and the emulation processing unit, and the virtual input/output control unit provides an interface for sending and receiving input/output access information between the target computer and the emulation processing unit. When an input/output access operation is performed, a command conversion processing unit is activated, and the command conversion processing unit converts the input/output access information set in the virtual input/output control unit into command information for the input/output control device and processes the input/output. The status conversion processing unit is activated by an interrupt issued by the input/output control unit, reads the command completion status, converts it to a status for the target computer, notifies the virtual input/output control unit, and converts the status to the virtual input/output control unit. The output control unit is configured to generate an interrupt to the target computer.

[Industrial application field]

The present invention relates to an emulation processing method for an input/output control device.

Since the control program (operating system) of a computer system is created using the instruction set architecture specific to the computer, the software running on the computer is an input/output control device that is compatible with the control method of the control program. The problem was that it could only be used. In order to utilize software assets, it is necessary to enable software to be used without depending on a specific input/output control device.

[Conventional technology]

FIG. 2 is a conventional system configuration diagram.

In this figure, when an application program 61 running on a computer system 6 uses an input/output control device 72, it requests the control program 7 (operating system) to input/output data. The control program 7 inputs and outputs data to and from the input/output control device 72 using the input/output control program 7.
1.

When the computer system 6 is connected to an input/output control device 74 that has a different control force formula from the input/output control device 72, the control instructions used by the input/output control program 71 cannot be used for the input/output control device 74.

Therefore, it is necessary to modify the input/output control program 71 to create an input/output control program 73 that matches the control commands of the input/output control device 74.

[Problem to be solved by the invention]

The input/output control device used by a computer system is controlled under the operating system (abbreviated as O3) that the computer system has, but since the control method of the input/output control device differs depending on O8, specific There was a problem in that the input/output control device used in O3 could not be used in other O3s.

The present invention converts commands and statuses of input/output control devices that operate on other O8s at the machine instruction level. ).

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention.

It has a virtual input/output control section 1, an emulation processing section 2, an input/output control device 3, and a target computer 4, and the emulation processing section 2 has a command conversion processing section 21 and a status conversion processing section 22. The virtual input/output control unit 1 provides an interface for sending and receiving input/output access information between the target computer 4 and the emulation processing unit 2. When an access operation is performed, the command conversion processing unit 21 is started, and the command conversion processing unit 21 converts the input/output access information set in the virtual input/output control unit 1 into command information for the input/output control device 3 and executes the command conversion processing unit 21. The status conversion processing unit 22 is activated by an interrupt issued by the input/output control device 3, reads the command completion status, converts it to the status of target computer 4, and performs virtual input/output control. The virtual input/output controller 1 generates an interrupt to the target computer 4.

[Function] The tree method allows input/output control devices that operate on other O3s to
By performing command conversion and status conversion at the machine instruction level, it is possible to use the input/output control device without depending on O3.

〔Example〕

FIG. 3 is a system configuration diagram of the embodiment. In this figure, the target computer 4 accesses the input/output control device 3 to which the floppy disk device 31 is connected (commands for reading or writing data and control information). This section explains the case when issuing (issuance).

The control program 41 writes control information such as machine instructions based on the instruction set architecture of the target computer 4 to the register section 11 of the virtual input/output control section 1 (referred to as write access), or reads information from the register section 11 (referred to as write access). read access). The command conversion processing section 21 of the emulation processing section 2 is activated by the write access or the read access.

In the case of write access, the command conversion processing unit 21 converts the control information of the register unit 11 into the register area 8 of the work area 8.
Store to 1.

The command conversion processing unit 21 searches the register area 81, and if the stored information is drive information, performs drive selection (drive unit selection) for the floppy disk device 31.
, performs motor control and related interrupt processing. If the stored information is a command, the command is analyzed and the drive information, track information, sector information,
Parameters for issuing a command to the input/output control bag W3 are created in the command parameter section 82 by referring to the data register information. The command conversion processing section 21 uses the command parameters of the command parameter section 82 to issue a command to the input/output control device 3, which is an actual device.

If the information stored in the register area 81 is track, sector, and data information settings, the information is held in the register area 81 as is.

The status conversion processing unit 22 is activated by an interrupt when a command to the input/output control device 3 ends. The status conversion processing unit 22 started by reading the command completion side reads the command completion status (status information) of the input/output control device 3 into the completion status unit 83, converts it into status information of the target computer 4, and stores it in the register area. The information is stored in the drive status register 81 and the status register, and is notified to the virtual input/output control unit 1.

As a result of the notification, the virtual input/output control unit 1 executes the control program 4.
1, and in response to the interrupt, the control program 41 performs read access (operation of reading the register section 11) to the virtual input/output control section 1. The command conversion processing unit 21 is activated by the read access, and transfers the value of the drive status register or the status register in the register area 81 to the register unit 11.

〔Effect of the invention〕

By simulating the operation of input/output control devices with different control methods at the machine command level, the present invention enables the use of input/output devices without depending on the O3 of the computer system, and enables the use of a wide range of computer system resources. This can be realized in terms of software assets and hardware assets.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a conventional system configuration diagram, and Fig. 3 is a system configuration diagram of an embodiment. rate processing section, 21 is a command conversion processing section, 22 is a status conversion processing section, 3.72.74 is an input/output control device, 31 is a floppy disk device, 4 is a target computer, 41.7 is a control program, 6 is a computer system, 61
71 and 73 are application programs, 71 and 73 are input/output control programs, 8 is a work area, 81 is a register area, 82 is a command parameter section, and 83 is an end status section.

Claims (1)

[Claims] Virtual input/output control unit (1) and emulation processing unit (2)
, an input/output control device (3), and a target computer (4), and the emulation processing section (2) has a command conversion processing section (2).
1) and a status conversion processing unit (22), and the virtual input/output control unit (1) is configured to exchange input/output access information between the target computer (4) and the emulation processing unit (2). When the target computer (4) performs an input/output access operation to the virtual input/output control unit (1), the command conversion processing unit (21
) is activated, and the command conversion processing unit (21) converts the virtual input/output control unit (1
) to transfer the input/output access information set to the input/output control device (
The status conversion processing unit (22) converts the information into command information for the input/output control device (3) and passes it to the input/output control device (3).
), reads the command completion status, converts it to the status for the target computer (4), and notifies it to the virtual input/output control unit (1). An emulation processing method for an input/output control device characterized by generating an interrupt in a computer (4).