JPH0395609A - Personal computer system - Google Patents

Abstract

PURPOSE:To prevent the destruction of data even if a power supply is interrupted in an access mode by waiting for the end of a disk access mode if it is in the disk accessing at the time of requiring a power OFF and then turning off a power unit after the system information is reserved. CONSTITUTION:When a power switch is turned off, a power unit 4 issues a power OFF NMI and waits for a power OFF state until a power OFF command is received. An NMI process block 1 checks based on the power OFF NMI whether an FDD access is kept or not. If so, the FDD NMI request information is set and the NMI process is terminated. An FDD process block 2 issues an FDD NMI if the FDD NMI request information is set at the end. Thus the block 1 stores the system information with a resuming process and then sends a power OFF command to the power unit 4. Thus, the unit 4 receives the command and turns off the power supply. In a resuming process carried out in the block 1, the system information is stored in a memory and a system reserving flag is set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a personal computer system in which files are not destroyed even if the power switch is turned off during disk access.

(Prior Art) In the field of personal computers, floppy disks (FDD) are standardly used as external storage, and recently it has become essential to also install relatively large-capacity hard disks (HDD). By the way, if the power switch is turned off while accessing a disk such as an FDD or HDD, especially while data is being written, the mechanism may stop and the data may be destroyed. Furthermore, even if the data is not destroyed, related data or files may become inconsistent.

(Problems to be Solved by the Invention) As described above, conventionally, if the power switch is turned off during FDD/HDD access, there is a possibility that the contents of the data and files in the disk are not guaranteed.

This invention has been made in view of the above circumstances, and is intended to prevent data on the disk from being destroyed even if the power switch is turned off during disk access in a personal computer, and to prevent the power from being turned off the next time the power switch is turned on. An object of the present invention is to provide a personal computer system that can be returned to its previous state.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a personal computer whose input/output is controlled by a basic input/output system, in which a power-off request is notified to the host as an interrupt when the power switch is turned off, and the host A power supply device that turns off the power with power-off permission from the power supply device, and a basic input/output system that stores system information until the access is completed if the disk is being accessed at the time of a power-off request, and then notifies the power-off permission to the power supply device. an interrupt processing means, a disk processing means in the basic input/output system that notifies the interrupt processing means of the end of the disk access if the interrupt processing means has been notified of a power-off request when the disk access ends, and a power switch; and means in the basic input/output processing system for system boot processing to restore system information if it has been retained and return control to the state immediately before the power switch was turned off. .

This prevents files on the disk from being destroyed or related data from becoming inconsistent even if the power switch is turned off during disk access, and
It is characterized in that when the power switch is turned on again, it returns to the state immediately before it was turned off.

(Function) In the above-described configuration, the power supply device issues a power OFF NMI when the power switch is turned OFF, waits for the arrival of a power OFF command, and then turns off the power.

If the host is accessing the disk using the "Power OFF NMI", the host sets the NMI request information, saves the system information to an external storage device or backup memory, and then outputs a power OFF command. The disk access means notifies the NMI processing means of the end of the disk access, if the means for NMI processing has been notified of the power-off request at the end of the disk access. The system boot processing means restores the system information if it is retained by turning on the power switch again, and returns control to the state immediately before turning off the power switch.

This makes it possible to prevent data on the disk from being destroyed even if the power switch is turned off during disk access, and to return to the state immediately before the power is turned on again.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, reference numeral 1 is a control block that executes NMI processing, which will be described later.
(interrupt) processing and resume processing to preserve system data.

Further, as a result, a power OFF command is sent to the power supply device 4, which will be described later. Reference numeral 2 is a block that performs FDD processing, and accesses the FDD connected to the system.
Issue FDD NMI to NMI processing block 1.

Reference numeral 3 is a block that performs system boot processing, and if system data is saved, system restoration is performed. code 4
is a power supply device, and the power is turned off when the power switch is turned off.
F Issuing an NMI or turning off power from the host
When a command arrives, the power is turned off.

The blocks for the NMI processing, F'DD processing, and system boot processing described above are all implemented in the basic input/output system (BI) built into the personal computer main body (host).
is programmed into the operating system (OS).

Reference numeral 5 is an FDD device. Reference numeral 6 is information indicating that the FDD is being accessed, and indicates whether or not the FDD is being accessed. code 7
is FDD Nyrxg request information, which indicates whether or not to issue an FDD NMI after FDD access is completed. Symbol 8 is system data, CPU register, each LS
This is data such as I information, V-RAM, memory, etc. code 9
is system save data, and the system data and system save flag are saved to an external storage device or backup memory.

Figures 2 to 5 are diagrams cited to explain the operation of the embodiment of the present invention, and are the flowcharts of NMI processing, resume processing within NMI processing, FDD processing, and system boot processing, respectively. shows.

In the figure, reference numeral 21 is a step of checking whether the puff is 10FF NMI. Reference numeral 22 is a step for checking whether or not FDD access is in progress, and the information set by the FDD process as to whether or not FDD access is in progress is checked. Reference numeral 23 is a step for setting an FDDNMI request. Reference numeral 24 is a step of checking whether or not it is FDD NMI. Reference numeral 25 is a step for performing resume processing, the details of which are shown in FIG. Code 26 is power O
This is a step of outputting an FF command, and a power OFF command is output to the microprocessor built in the power supply device 4. Reference numeral 27 is a step for performing other NMI processing, and NMI other than power OFF NMI and FDD NMI
Perform processing.

Reference numeral 31 is a step for saving system information, in which various data of the system are saved in an external storage device or a backup memory. Reference numeral 32 is a step to express that the system is being saved, and a system save flag is set.

Reference numeral 41 is a step for determining that the FDD is being accessed, and N
Information for determining whether or not the FDD is being accessed in MI processing is provided during the FDD access. Reference numeral 42 is a step for performing FDD access processing. Reference numeral 43 is a step for terminating FDD access, and is information for determining whether or not FDD access is in progress in NMI processing. Reference numeral 44 is a step of checking whether or not it is an FDDNMI request;
It is determined whether or not to issue an FDD NMI based on the FDD NMI request information set by the NMI process. Reference numeral 45 is a step for clearing the FDD NMI request. Reference numeral 46 is a step of issuing an FDD NMI.

Reference numeral 51 is a step for checking whether the system is being preserved, and the system preservation flag is checked. Reference numeral 52 is a step for restoring system information, in which various data of the system are restored to the system from an external storage device or backup memory. Reference numeral 53 is a step in which the system is not saved, and the system save flag is cleared. Reference numeral 54 is a step of transferring control to the system,
Returns the saved system information to the CPU register and transfers control to the program counter. Reference numeral 55 is a step for performing normal system boot processing.

When this is activated and executed, the system becomes operational.

Hereinafter, the operation of the embodiment of the present invention will be explained in detail.

When the power switch is turned off, the power supply device 4 issues a power 10FF NMI. Then, it waits until a power OFF command is received to turn off the power. Power 10FF
According to the NMI, the NM■ processing block 1 checks whether or not the FDD is being accessed based on the FDD accessing information,
If it is not being accessed, a power OFF command is sent to the power supply device 4.

If accessing, set FDD NMIi request information,
End NMI processing.

The FDD processing block 2 sets and clears the FDD access information at the start and end, but the FDD NM
If the I request information is set, issue an FDD NMI. With this FDDNMI, NMI processing block 1 saves system information by resume processing,
After that, a power OFF command is sent to the power supply device 4.

The power supply device 4 receives the power OFF command and turns off the power. Resume processing within NMI processing block 1 saves system information to external storage or backup memory and sets a system save flag.

Turn on the power switch, system boot processing block 3
restores the system from external storage or backup memory if the system save flag was set.

As described above, when accessing the FDD, the electric power lJi. Even if the switch is turned off, the data in the FD will not be destroyed, and the next time the power switch is turned on, the previous state can be restored.

Although the present invention has been shown by way of example only for FDDs, it can be applied not only to FDDs but also to HDDs with the same specifications.

[Effects of the Invention] As explained above, according to the present invention, even if the power switch is accidentally turned off while accessing the FDD, the data in the FD is not destroyed, and when the power is turned on again, the state immediately before being turned off can be returned immediately. It has the advantage of being able to continue processing.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIGS. 2 to 5 are diagrams cited to explain the operation of the embodiment of the present invention, and FIG. 2 is a flowchart showing NMI processing;
FIG. 3 is a flowchart showing resume processing in the NMI processing block, FIG. 4 is a flowchart showing FDD processing, and FIG. 5 is a flowchart showing system boot processing. 1... NMI processing block, 2... FDD processing block, 3... System boot processing block, 4...
Power supply, 9...System save flag.

Claims (1)

[Claims] In a personal computer whose input/output is controlled by a basic input/output system, a power supply device that notifies the host of a power-off request as an interrupt when the power switch is turned off, and turns off the power upon power-off permission from the host; If the disk access is in progress, the interrupt processing means in the basic input/output system is retained until the access is completed, and then the system information is saved and the power supply device is notified of power-off permission, and when the disk access is completed, the interrupt processing means issues a power-off request. If the system information has been retained, the disk processing means in the basic input/output system notifies the interrupt processing means of the end of the disk access, and the system information is restored and controlled by turning on the power switch. A personal computer system comprising means in the basic input/output processing system described above for performing system boot processing to return to the state immediately before the power switch was turned off.