JPH0390936A - Conversion system for hardware interruption level - Google Patents

Abstract

PURPOSE:To start an OS with hardware having different interruption levels without remodeling the OS by converting the interruption level generated from the hardware into an interruption level for OS via a hardware interruption level conversion process. CONSTITUTION:An interruption process 6 includes an interruption level converting function 7 which performs the conversion of interruption levels by reference to an interruption level conversion table 5 and an interruption holding function 8 which performs a check to carry out the interruption processes in order of higher preference levels after conversion of the interruption levels. Furthermore an interruption simulating function 9 is provided to the process 6 to shift a process to an address which is shown by a table of an interruption handler before a change as if an interruption are applied to a hardware interruption level set in an OS 1 directly from the hardware. In such a constitution, the OS 1 can be started with hardware of different interruption levels without remodeling the OS 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hardware interrupt processing method, and particularly to a hardware interrupt level conversion method.

[Conventional technology]

Conventionally, if the hardware interrupt level set for the target hardware differs from the hardware interrupt level managed by the OS, the OS will not operate on that hardware.

[Problem to be solved by the invention]

In order for an OS to support the above-mentioned conventional hardware with different hardware interrupt levels, there is a drawback that the OS must be modified for the target hardware.

[Means to solve the problem]

The hardware interrupt level conversion method of the present invention includes means for converting the level of an interrupt generated from hardware to the level of an OS interrupt to be used, and means for emulating the converted interrupt into O5. and means for suspending the interrupt.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

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

Initialization process 2 of OS1 is performed by hardware 1 on which the OS operates.
The hardware type recognition function 3 recognizes which type 0 is, and the interrupt level conversion table data for the recognized hardware is selected from among the conversion table data 11, 12, and 13. 5 and changes the interrupt handler table so that when an interrupt occurs, the processing moves to the interrupt level conversion function 7.

The interrupt processing 6 includes an interrupt level conversion function 7 that converts the interrupt level by referring to the interrupt level conversion table 5, and an interrupt pending function that checks to perform interrupt processing in descending order of priority after converting the interrupt level. Interrupt emulation that shifts the processing to the address indicated by the interrupt handler table before changing the hardware interrupt level set in Function 8 and ○S1 as if the interrupt was directly from the hardware. Function 9 is included.

FIG. 2 is a flowchart of OS initialization processing 2. In the figure, a hardware type recognition unit 21 recognizes the type of currently operating hardware by reading, for example, a fixed address in the ROM. The interrupt level conversion table set 22 that has received the recognized type reads data for the hardware of the received type from among the interrupt level conversion table data predetermined according to the hardware type and converts it into the interrupt level conversion table 5. Set to . Interrupt processing address change 23 is set in advance in a fixed interrupt handler table, and changes the address that would have caused processing to directly transfer to the interrupt level handler to transfer to interrupt level conversion processing. and save the interrupt handler table before the change to the data area.

FIG. 3(a) is a flowchart showing the flow of processing when a hardware interrupt occurs. When a hardware interrupt occurs, the interrupt level conversion 31 is shifted by changing the address of the interrupt handler. The interrupt level conversion 31 refers to the interrupt level conversion table 5 and converts the interrupt level. For example, referring to the interrupt level conversion table 5 shown in FIG. 3(b), if an interrupt occurs from the keyboard of the interrupt device 51, the hardware setting interrupt level 52 is set to level 2. , control passes to the level 2 handler of the interrupt level conversion 34, refers to the interrupt level conversion table 5, and determines that the interrupt level 53 recognized by the OS is O for the hardware setting interrupt level 2. It turns out that there is an interrupt and converts it to interrupt level O.

Next, in step 32, it is checked whether an interrupt has already occurred at a higher priority level than the converted interrupt level. If the interrupt has not occurred, the process advances to the interrupt emulation 33, and if the interrupt has occurred, the process advances to the interrupt pending 34.

The interrupt emulator 33 turns on the flag of the level to be emulated among the interrupt flags with pins 1 to 1 for the interrupt level, refers to the copied interrupt handler table before the change, and emulates the interrupt handler table. Transfer control to the handler at the rate level. In other words, it is as if control was directly transferred due to an interrupt from hardware. This emulates an interrupt and shows which level is currently being interrupted.

The interrupt suspension 34 turns on the flag of the level to be suspended among the pending flags having flags corresponding to the interrupt levels. This will tell you which levels are currently pending.

FIG. 4 is a flowchart showing the processing after the OS interrupt processing is completed by the emulation described above. After the control is transferred by the above emulation, the interrupt flag of the level at which the interrupt was being emulated is turned off. After that, the pending flag is checked (step 41), and if there is currently a pending interrupt, if the highest priority level pending interrupt is higher than the highest priority interrupt interrupt emulation 42. Let's do it. This interrupt emulation 42 is the same process as the interrupt emulation 33 shown in FIG. 3 described above. Also, if the priority level is not high, the process exits without doing anything.

〔Effect of the invention〕

As explained above, the present invention converts interrupt levels generated from hardware into interrupt levels for the OS using hardware interrupt level conversion processing, thereby creating an interrupt level conversion table without modifying the OS. By simply changing this, the OS can operate on hardware with different interrupt levels.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of initialization processing, and FIGS. 3 and 4 are flowcharts showing the operation of interrupt processing. 1... OS, 2... Initialization processing, 3... Hardware type recognition function, 4... Interrupt level conversion data reading function, 5... Interrupt level conversion table, 6... Interrupt processing, 7... Interrupt level conversion function, 8... Interrupt pending function, 9... Interrupt emulation function, 10... Hardware.

Claims (2)

[Claims] (1) A means for converting the level of an interrupt generated from hardware into an interrupt level of the OS used, a means for emulating the converted interrupt in the OS, and a means for suspending the interrupt. A hardware interrupt level conversion method comprising: (2) The method according to claim 1, characterized in that the level of an interrupt generated from hardware is converted to the level of an interrupt of an OS to be used, and the converted interrupt is emulated in the OS. Hardware interrupt level conversion method.