JPH0235333B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Technical Field of the Invention The present invention relates to a ZAP area setting processing method, particularly a so-called ZAP area in which batch data for bug correction of a program module in a data processing device is stored. This relates to a ZAP area setting processing method that aims to effectively utilize the main memory by making only the part of the ZAP area that is actually used resident in the main memory, and making the unused part non-resident.

(B) Technical background Generally, a program for making a computer perform a desired operation is created as a source module using character codes, converted into object modules by a compiler or assembler, and then converted into object modules by combining and editing modules. is converted into an executable load module. When a mistake is made in a program, it is essentially necessary to correct the source module, recompile or reassemble it, and recombine and edit the modules. However, especially in the case of an operating system, the above processing takes a lot of time, so if the amount of modification is relatively small or if modification is urgently required, consider the assigned address. , a direct modification of the load module is performed. In the case of adding an instruction, etc., an area is required for adding that instruction, so you can deal with this by preparing a ZAP area in the system in advance and cutting out and using that area as needed. things are being done.

(C) Conventional technology and problems Conventionally, since it is unknown in advance which module and how much the ZAP area will be used, even if it is a fixed size, it is incorporated as a module at a relatively low address and the main It was made to reside permanently in memory. According to this conventional method, if the ZAP area is set too large, there will be more waste in the main memory, and if it is too small, if the amount of corrections increases in the future, the ZAP area will become insufficient and the ZAP area will be used twice. There's a problem.

(D) Purpose and Structure of the Invention The present invention aims to solve the above-mentioned problems by making the used portion of the ZAP area resident in the main memory and making the unused portion non-resident, thereby preventing future shortages of the ZAP area. The purpose is to avoid double use of the ZAP area, reduce unnecessary resident storage, and make effective use of main memory. Therefore, the ZAP area setting processing method of the present invention sets a ZAP area in a predetermined address space in which instructions or data for emergency correction of a program module in a data processing device that fetches and executes instructions in main memory to be stored. In the ZAP area setting processing method to secure in advance, the ZAP area is allocated to the end of the system resident module group, and a boundary information storage unit that stores information indicating a boundary between a used area and an unused area in the ZAP area; , above ZAP
A ZAP area allocation setting unit that sequentially cuts and allocates areas from the top and updates the contents of the boundary information storage unit at the time of allocation, and a ZAP area allocation setting unit that updates the contents of the boundary information storage unit at the time of allocation, and a ZAP area allocation setting unit that refers to the boundary information storage unit at the time of system IPL and determines the boundary between the used area and unused area. It is characterized by a ZAP area loading section that loads pages up to the recognized and used area into main memory. Embodiments will be described below with reference to the drawings.

(E) Embodiment of the invention FIG. 1 shows the configuration of an embodiment of the invention, and FIG.
The figure shows the internal structure of one embodiment of the illustrated nuclear load module area.

In the figure, code 1 is the patch data input section, and 2 is the patch data input section.
ZAP area allocation setting section, 3 is system volume, 4 is nuclear load module area, 5 is ZAP
Area module, 6 is resident module, 7-1 is
Used part of the ZAP area, 7-2 is an unused part of the ZAP area, 8 is a boundary information storage part, 9 is a non-resident module for system initialization, 10 is a system initialization part, 11
12 is a resident module load section, 12 is a ZAP area load section, 13 is a boundary determination section, 14 is an initialization processing section, and 15 is a main memory.

The system volume 3 is a storage medium on a direct access device such as a magnetic disk device, and stores control programs, various control tables, and other load modules by system generation. In particular, the nuclear load module area 4 holds resident modules 6 such as control programs and data that must always reside in the main memory, and instructions and data for emergency correction to deal with bugs, etc. ZAP
The area module 5, non-resident module 9 for system initialization, etc. are stored.

A sufficiently large address space is prepared for the ZAP area module 5 at the time of system editing, and the first address is set to follow the end of the resident module 6 except for the ZAP area module 5. The area of the ZAP area module 5 is used by sequentially storing commands and data for modification from the beginning as needed after the system starts operating. A boundary information storage unit 8 is provided to indicate the boundary with the unused portion 7-2 of the ZAP area that has not yet been used to store instructions and data. This boundary information storage section 8
For example, code strings that are not used in normal instructions or data, such as hexadecimal X′FFFF−
F′ is used as a fence. Also, something like pointer information indicating boundaries may be stored and used. In the case of a fence, the position of the boundary information storage section 8 changes within the ZAP area, but when the boundary is managed by a pointer, the position of the boundary information storage section 8 is fixedly determined.

When batch data is given from the batch data input unit 1 and a new request to use a ZAP area is made, the ZAP area allocation setting unit 2 receives the ZAP data from the boundary information storage unit 8 of the ZAP area module 5.
Obtain the head information of the unused area 7-2, cut out an area of the necessary size, set the command and data for emergency correction of batch data there, and mark the area after the cut out area as an unused area. The boundary information storage unit 8 is updated to set the new boundary.

The system initialization unit 10 belongs to the non-resident module 9 for system initialization, and is loaded and started at the time of initial program loading (IPL) of the system. The system initialization unit 10 first loads the resident module 6 into a predetermined area on the main memory 15 using the resident module load unit 11 . Next, control is transferred to the ZAP area loading section 12. The ZAP area loading unit 12 loads the ZAP area module 5 after the resident module 6. however,
Rather than loading the entire ZAP area module 5 onto the main memory, only the used part 7-1 of the ZAP area is extracted and made resident. Therefore, it has a boundary determination section 13, and the boundary determination section 13 allows
The fence 8' in the boundary information storage section 8 is detected. Generally, the unit of memory allocation for resident/nonresident is, for example, a 4096-byte page unit, so
The pages from the beginning of the ZAP area to the page containing fence 8' are loaded onto the main memory and made resident, and the rest are made non-resident and no main memory is allocated to them. Therefore, only the ZAP area usage section 7-1 in which commands and data necessary for emergency correction are actually stored occupies the main memory in the ZAP area module 5. In addition, regarding the unused part after fence 8' on the page where fence 8' exists,
As before, it can be used as free storage in the system's work area. Boundary information storage unit 8
The same applies even if the information is not the fence 8' but pointer information.

After the ZAP area loading unit 12, the initialization processing unit 1
4 is activated, and the initialization processing section 14 performs the following steps as before.
Performs initial settings for various system control blocks, initializes input/output devices, and other processing.

(F) Effects of the Invention As explained above, according to the present invention, only the actually necessary portion of the ZAP area can occupy the main memory, and the unused portion can be made non-resident. Even if the area is made relatively large in advance, the main memory will not be wasted, and if a new area is needed for emergency correction instructions or data, the non-resident part will automatically become resident. Therefore, it is possible to easily avoid situations where the ZAP area runs out.

[Brief explanation of drawings]

Figure 1 shows the configuration of one embodiment of the present invention, and Figure 2 shows the configuration of the first embodiment.
The figure shows the internal structure of one embodiment of the illustrated nuclear load module area. In the figure, 1 is patch data input section, 2 is ZAP
Area allocation setting section, 3 is system volume,
4 is the nuclear load module area, 5 is the ZAP area module, 6 is the resident module, 7-1 is the ZAP
The used part of the area, 7-2 is the unused part of the ZAP area,
8 is a boundary information storage unit, 9 is a non-resident module for system initialization, 10 is a system initialization unit, 11 is a resident module load unit, 12 is a ZAP area load unit, 13 is a boundary determination unit, and 14 is an initialization processing unit , 15 represents the main memory.

Claims (1)

[Claims] 1 Stores instructions or data for emergency modification of a program module in a data processing device that fetches and executes instructions from main memory
Reserve a ZAP area in a specified address space in advance
In the ZAP area setting processing method, a boundary information storage unit that allocates the ZAP area to the end of the system resident module group and stores information indicating a boundary between a used area and an unused area in the ZAP area; A ZAP area allocation setting unit that sequentially cuts out and allocates areas from the top and updates the contents of the boundary information storage unit at the time of allocation, and a system IPL
A ZAP area characterized by comprising a ZAP area loading unit that sometimes refers to the boundary information storage unit, recognizes the boundary between a used area and an unused area, and loads pages including the used area into main memory. Setting processing method.