JPS633337A - Dynamic loading system for system control program - Google Patents

Abstract

PURPOSE:To ensure addition of a system function in a no-stop state by adding an expandable system symbol table and an expansion system control program file to be newly added onto an auxiliary memory device. CONSTITUTION:A system symbol table 12 is set in an auxiliary memory device 11; while the 1st system control program file 22 and the 2nd system control program file 23 are set on an auxiliary memory device 21 respectively. The file 22 stores all system control programs produced in a system production mode. Then the file 22 is loaded to a static system control program area 36 in a system rise mode. While the file 23 stores the system programs SP1, SP2... to be added with expansion and then loaded to a dynamic system control program area 37 in a system operation mode.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a system control program load control method in an electronic computer system.

(Prior Art) Conventionally, in system control programs, necessary programs are selected when the system is released, and all system control programs are loaded into the system control program area at the time of initial loading of the system, that is, at the time of system startup, and the above programs are loaded into the system control program area. All intervening references to the system control program 5YSREF are also resolved. Such a system is shown, for example, in FIG. In FIG. 12, 11 and 21 are first and second auxiliary storage devices, respectively, 12 is a system symbol table, and 22
is the system control program, 31 is the main storage, 32 is the SYSDEF table, 33 is the system control program, 34
is the dynamic system control program area. Here, the dynamic system control program area 34 is allocated to the same area as the system control program area.

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, the size of the system control program is determined when the system is installed, all system control programs are loaded by the time the system is started up, and thereafter, the system control program is The disadvantage is that when adding a system, the system must be generated again.

Therefore, it is not possible to add system functions to a system that is in a stopped state for 24 hours, and when testing new functions during the development of a system control program, it is necessary to generate the system. There is a drawback.

An object of the present invention is to provide an expandable system symbol table and a newly added expandable system control program file on auxiliary storage, and further provide an expandable S
The above disadvantages are eliminated by providing the YSDEF table, an expandable system program load control table, and static and dynamic system control program areas on the main memory, and the dynamic loading of system control programs in computer systems is improved. The purpose is to provide a method.

(Means for Solving the Problems) The system control program dynamic loading method according to the present invention includes first and second auxiliary storage devices and a main storage device, and the system control program area is stored in a static system. It consists of a control program area and a dynamic system control program area, and allows the system control program in the main storage to be loaded into the first and second auxiliary storage devices.

The first auxiliary storage device includes an expandable system symbol table.

The second auxiliary storage device includes a plurality of expandable system control program files.

The main storage device has an expandable SYSDEF table, an expandable system program load control table, a static system control program area consisting of a system control program file, and a dynamic system control program area consisting of a system control program file. It is something.

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

FIG. 1 is a block diagram for realizing a system control program dynamic loading method according to the present invention. In FIG. 1, 11.21 are first and second auxiliary storage devices, 12 is a system symbol table, 22 is a system control program file, 23 is a second system control program file, 31 is a main storage device, 32 is SYSDEF
33 is a system control program file, 35 is a system program load control table, 36 is a static system control program area, and 37 is a dynamic system control program area.

In FIG. 1, a system symbol table 12 is provided on a first auxiliary storage device 11, and a first system control program file 22 and a second system control program file 23 are provided on a second auxiliary storage device 21. .

As shown in Figure 2, the system symbol table 12 includes the SYSDEF name in the system control program (the name in the system control program given to the address referenced from other programs), the system control program name, and the SYSDEF name in the system control program. It has an index value.

The system control program file 22 stores all system control programs created at the time of system generation, and the first system control program file 22 stores the static system control program area 3 at the time of system startup.
6. The second system 111M program file 23 stores expanded and added system control programs (SPI, SF3,...).
It is loaded into the dynamic system control program area 37 upon request during system operation.

The main storage device 31 is provided with a static system control program area 36 and a dynamic system control program area 37 as system control program areas. The uses of these areas are as described above.

Static system control program area 36 of main storage device 31
In addition to system control program file 33, 5Y
An SDE11 table 32 and a system program load control table 35 are provided.

The above table is a control table on the main storage device 31 that corresponds to the system symbol table 12 on the first auxiliary storage device 11. The contents of these tables are as shown in FIGS. 3 to 5. A program instruction that references 8YSDEF (referred to as 8YSREF) in the system control program and its operand have the format shown in FIG.

In FIG. 6, if the value of the tag of the data descriptor indicated by the operand of the instruction is "1", a trap is generated to notify that it is an unresolved 5YSREF. At this time,
The contents of the data descriptor that generated the trap are passed as information.

The SYSDEF index value of this content
By knowing the relevant entry in the EF table 32, it is possible to execute control to solve 5Y8REF.

On the other hand, if a system function is used, the program (referring to the user program and system control program) has 5YSREF. That is, by searching the system symbol table 12 shown in FIG. 2, it is possible to determine whether or not it is 5YSREF. If 5YSREF exists, a unit entry is created in the 5YSREF information table shown in FIG. This 5Y8REF information table is
Created with a program and stored in a program library file. Further, SYSDEF can also be determined by searching the system symbol table 12, and this information is also set in the SY, 8DEF information table and stored in the program library file along with the program.

A control procedure according to the present invention using the various tables described above will be described below.

In addition, when executing the following control procedure, since there are multiple simultaneous accesses to the same table, the above-mentioned table locking/association is necessary. Therefore, the following three lock mechanisms are provided.

A first lock is placed on the system symbol table 12, a second lock is placed on the SYSDEF table 32 and the system program load control table 35, and a third lock is placed on the system control program being loaded. It is provided for meeting people.

The process is executed by the following four control procedures 1 to 4.

(1) Control procedure 1 Steps for registering SYSDEF) @ This is a procedure executed according to FIG.

In step 801, the SYSDEF name and system control program name to be registered are input.

In step 802, the first lock is locked. In step 803, a free entry in system symbol tables 1 and 2 is assigned to the input SYSDEF name. At this time, the corresponding SYSDEF index value is also determined. In step 804, SYSD is added to the above empty entry.
EF name, system control program name, and 5Y8DEF
Set the index value. In step 805,
Unlock the first lock.

In step 806, the second lock is locked. In step 807, the state of tag = 1 (unresolved state) shown in FIG.
is set, a free entry in the system program load control table 35 is allocated, and a pointer to this system program load control entry is set. Step 808
Then, for the system program load control table entry, the status flags LOAD ING flag and LOADED flag are set to @01, and the system control program name is set. In step 809, the second lock is unlocked.

(2) Control procedure 2 This is a control procedure added when creating a program consisting of a user program and a system control program.
The procedure is carried out according to the figure.

In step 901, the program is input, and in step 90
In step 2, the first lock is locked.

In step 903, it is determined whether processing of all external references and external definitions has been completed. If the processing has not been completed, the synutem symbol table 12 is searched by the external reference name or external definition group in step 904. In step 905, it is determined whether the above name has been found. Step 90
In 6, if it is an external reference name, set the unit end l) to the 5YSREF information table, and if it is an external definition base, set the unit end l) to the 5YSREF information table.
Set a unit entry in the DEF information table. In step 907, the next external reference or external definition is obtained, and then the process returns to step 903. If the process in step 903 has not been completed, the first lock is unlocked in step 908. In step 909, the 5YSREF information table and the SYSDEF information table are stored in the program library file along with the program body.

(3) Control Procedure 6 This is a control procedure added when loading the user program, and is a procedure executed according to FIG.

In step 1001, the corresponding user program is loaded, and in step 1002, a 5YSREF information table for the user program is obtained. In step 1003, the second lock is locked, and in step 1004, it is determined whether all 5YSREFs (external references) have been resolved. If the above 5YSREF is not resolved, in step 1005, the SYSDEF' index value in the entry of the 5YSREF information table is used to resolve the SYSDEF.
Obtain the corresponding entry in the SDEF table and obtain the SYSDEF pointer from the entry. In step 1006, the SYSDEF pointer is set to the 5YSREF section. In step 1007, the next 5YSRBF information table end IJ is obtained, and the process returns to step 10041. Above 5
If YSREF has been resolved, the process advances to step 1008 and the second lock is unlocked.

(4) Rule I] Procedure 4 When an instruction (see Figure 6) that has a data descriptor with '1'AG=l as an operand is executed, a trap occurs and an unresolved 5YSDBF (system definition, It is shown that there was a righteousness).

Control procedure 4 for solving this problem is executed according to FIG. In step 1101, a message notified by a trap is obtained.

This message contains the 5YSI)EF index value. In step 1102, the 5YSDBF index value is obtained from the message. Step 11
03 locks the second lock, and step 1104 locks the SYSDEF corresponding to the SYSDEF index value.
Get table entries. In step 1105, SYSD
A system program load control table entry (hereinafter referred to as 5LCTB) is obtained from the entry in the EF table. In step 1106, the L OA D engineering N on the 5LCTE is
Check the G flag.

If the value of the LOAD ING flag is not "1", the LOAD on 5LCTE is executed in step 1107.
Check the ED flag. If the value of the LOADED flag is not 1', 5LcT is set in step 7 l108.
E (7) Set the LO and ADING flags to 111. Therefore, the second lock is unlocked at Sten 7'1109. In step 1110, the system control program indicated as 5LCTE is loaded into the dynamic system control program area. Step 1111 locks the second lock, step 1112 determines the addresses of all 5YSDBFs on the SYSDEF information table of the system control program, and stores these values in the 5YSDB of all entries in the corresponding 5YSDBF table.
F pointer section and set the tag value to 10" as shown in FIG. 4. In step 1113, 5LCT
Set the LOADED flag of E to 1" and LOAD
Set the value of the ING flag to 10″. Step 11
Step 14 unlocks the second lock, step 111
In step 1116, when a system control program load request is awaited, all requests are released from the third lock.In step 1116, the SYSDEF pointer value is obtained from the entry in the 3YSDBF table and a trap is generated. This is set in the data descriptor which is the operand that was used, and the value of this tag is set to "0#" before proceeding to step 1121. If the value of the LOADSING flag is "1" in step 1106, proceeding to step 1117. In step 1117, the second lock is unlocked. In step 1118, the second lock is locked. In step 1119, the second lock is locked, and then the process returns to step 1106. In step 1107, the LOADED
If the value of the flag is "1", the process proceeds to step 1120, where an entry in the 8YSI)EF table is obtained based on the SYSDEF index value, and then the process proceeds to step 1116.

In step 1121, control is passed to the instruction that generated the trap.

(Effects of the Invention) As explained above, the present invention provides an expandable system symbol table and an auxiliary storage for newly added expanded system control program files so that a system control program can be added during system operation. By providing an expandable 5YSDBF table on the device, an expandable system program load control table, and static and dynamic system control program areas on the main storage,
It is possible to add system functions non-stop to a system that is operated non-stop for 24 hours, and during system development, it is possible to add and test system functions without having to generate the system. There is an effect.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the system control program dynamic loading method according to the present invention. FIG. 2 is an explanatory diagram showing an example of the system symbol table in FIG. 1. FIG. 3 is an explanatory diagram showing an example of the 5YSDBF table and the system program load control table in FIG. 1. FIG. 4 is an explanatory diagram showing an example of the SYSDEF pointer in FIG. 1. FIG. 5 is an explanatory diagram showing an example of the status display flag in FIG. 1. FIG. 6 is an explanatory diagram showing an instruction format having 5YSRBF' as an operand. FIG. 7 is an explanatory diagram showing an example of the 5YSREF information table and the 8YSDEF information table in the program. FIGS. 8 to 11 are flowcharts each showing a control mechanism for realizing the present invention. FIG. 12 is an explanatory diagram showing an example of implementing a conventional system control program loading method. 11.21...Auxiliary storage device 12...System symbol table 22.23, 33...System control program file 31...Main storage device 32...5YSDBF table 35...System program load control Table 34.36
...Static system control program area

Claims (1)

[Claims] a first auxiliary storage device with an expandable system symbol table; a second auxiliary storage device with a plurality of expandable system control program files; and an expandable SYS.
A main storage device comprising a DEF table, an expandable system program load control table, a static system control program area consisting of the system control program file, and a dynamic system control program area consisting of the system control program file. and the system control program area is configured such that the system control program in the main storage device can be loaded into the first and second auxiliary storage devices by the static system control program area and the dynamic system control program area. Features a dynamic loading method for system control programs.