JPH0471034A - Multitask execution device - Google Patents

Abstract

PURPOSE:To prevent the generation of overhead by specifying the total number of register files and executing a context by successively using the register files. CONSTITUTION:When the value of a bank number specifying register 4 is set up to '4' by a CPU in accordance with the execution of an OS, the value of a bank number counter 6 is successively changed to '0(bank 0)', '1(bank 1)', '2(bank 2)', and '3(bank 3)' synchronizing with an end signal 7. Since the value of the register 4 is set up to '4', a set/reset signal 9 is outputted from a comparator 5 at the time of executing register files 2 up to bank 3, the value of the counter 6 is cleared and the bank 0 of the file 2 is selected again. Hereafter the register files 2, 2... are successively switched from '0(bank 0)' up to '3(bank 3)'.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multitask execution device that efficiently executes multiple tasks.

(Prior Art) Conventionally, in a multi-task execution device, register files in a multi-bank system having a plurality of register files are switched by an operating system (hereinafter referred to as O8) by a system call from a register file assigned to a user bank. ) or a register file to be executed, then O8 searches for a user task to be executed next, and allocates that user task to one register file for processing.

(Problem to be Solved by the Invention) However, in the above-mentioned multi-task execution device, an overhead, which is the running time of O8, occurs between executions of user tasks, making it difficult to realize a system that requires real-time processing. It was difficult.

Therefore, methods have been considered to implement part of the context processing using hardware, but even with this method, overhead still occurs and there is a problem that multitasking execution efficiency is poor.

The present invention solves the above-mentioned conventional problems, and aims to provide a multi-task execution device that realizes a high-speed context without generating overhead in a multi-bank system in which the execution order of user tasks can be limited in advance.

(Means for Solving the Problems) In order to achieve the above object, the multitask execution device of the present invention is configured to automatically sequentially execute contexts by specifying the total number of register files that execute contexts. This is what I did.

Specifically, the measures taken by the present invention are first aimed at a multi-bank system consisting of a plurality of register files. Further, register file number designating means is provided for designating the total number of register files that perform context. In addition, context execution means is provided for automatically executing a context using the number of register files designated by the register file number designation means in order.

(Operation) With the above configuration, in the present invention, first, the total number of register files to be used for context is specified by the register file number specifying means. By specifying the total number of register files, the context execution means automatically executes the context using the specified number of register files in order.

Then, when executing this context, you may set whether or not to add the register file of the privileged bank to the context loop, and also set the context loop direction to either the ascending order of the register file number or the ascending order of the register file number. May be set.

Therefore, since context is performed using register files in order, system throughput can be improved and high-speed processing can be realized.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of a multitask execution device according to the present invention, which includes a plurality of register files 22. . . . executes a context in a multi-bank system consisting of...

In this FIG.
and a bank number counter 6. The bank number designation register 4 is assigned to the register file group 1 by the operating system (hereinafter referred to as O8).
Of these, register file number designating means is configured to designate how many register files 2 are used to execute a user task. Furthermore, when the bank number counter 6 completes the specification of the bank number designation register 4, the value of the bank number counter 6 becomes the selection signal 8 of the register file 2, and the value of the bank number counter 6 becomes the selection signal 8 of the register file 2. Select the required bank from Furthermore, when the user task of one register file 2 is completed, a completion signal 7 is input to the bank number counter 6, and the value of the bank number counter 6 is updated. Further, the comparator 5 inputs the values of the bank number designation register 4 and the bank number counter 6, and when they match, outputs a set reset signal 9 to set or reset the value of the bank number counter 6. The comparator 5 and the bank number counter 6 constitute a context execution means 10.

FIG. 2 shows the sequence of the multitask execution device described above. Assuming that the value 11 of the bank number designation register 4 is set to "4°" by the CPU by executing O8,
The value 12 of the bank number counter 6 changes to “0 (bank 0),” “1 (bank 1),” and 2 (bank 2) in synchronization with the end signal 7.
It changes in the order of "3 (Bank 3)". After that, since the value 11 of the bank number designation register 4 is set to "4°," when the execution reaches bank 3 of the register file 2, the reset signal 13, which is the set reset signal 9, is output from the comparator 5. , the value 12 of the bank number counter 6 is cleared, and bank O of the register aisle 2 is selected again.
)", "2 (Bank 2)", 3 (Bank 3) #, etc., the register files 2, 2, etc. are switched in this order.

FIG. 3 shows a detailed configuration of the bank selection section 3 of the multitask execution device. In FIG. 3, the bank 0 flag 14 is the register file 2 of the privileged bank assigned to O8 (bank 0 in the specific example described later).
This is a flag that specifies whether or not to add the privileged bank register file 2 to the context loop.When set to "1", register file 2 of the privileged bank is added to the context loop. The context direction designation flag 17 is a register that specifies the direction of the context loop, and when it is "1", the loop is performed in the order of the smallest bank number, which is the number of the register file 2, and when it is "0#, it is made to loop in the order of the largest bank number. The bank number specification register 4 is stored in the register file 2 as described above.
This is a register that specifies how many are used to execute the context loop, and specifies the number of register files.

Then, the value of the bank 0 flag 14 and the value of the inverter 1
The value of the context direction designation flag 17 inverted by 8 is input to the adder 15 together with the value of the bank number designation register 4.

Furthermore, when the value of the context direction designation flag 17 is "0", the complement generation circuit 19 inputs the complement of 1 for the value of the bank number designation register 4 to the adder 15, and when the value of the context direction designation flag 17 is "1", ”, the value of the bank number designation register 4 is input as is to the adder 15. The addition result of the adder 15 is input and set to the bank number register 16.

On the other hand, when the value of the context direction designation flag 17 is "1", the bank number counter 6 performs a count-up operation in synchronization with a bank processing end signal (not shown), which is the end signal 7 in FIGS. 1 and 2. and when the value of the context direction designation flag 17 is "0", a countdown is performed. Furthermore, the value of bank number counter 6 and bank number register 1
The value of 6 is input to the comparator 5, and when they match, the set clear signal 20, which is the set reset signal 7 mentioned above, is input to the bank number counter 6. At this time, when the value of the context direction designation flag 17 is "1", the bank number counter 6 is cleared, and when the value is '0', the bank number counter 6 is set to 1.

Next, the operation of the bank selection section 3 will be explained based on a specific example. Note that the privileged bank which is the register file 2 of O8 is bank 0.

Specific example (1) Bank 0 flag 14-1 Context direction specification flag 17-0 Bank number specification register 4-011 When set, the value of bank number register 16 is 110.
As shown in Table 1 below, it operates from the top downward.

Table 1 Specific example (2) Bank 0 flag 14-0 Context direction specification flag 17-0 Bank number specification register 4-011 When set, the value of bank number register 16 is 101.
The operation is as shown in Table 2.

Table Bank number specification register 4-011 If set to 2, the value of bank number register 16 is 010.
The operation is as shown in Table 3.

Table 3 Specific example (3) Bank 0 flag 14-1 Context direction specification flag, 17-1 Specific example (4) Bank 0 flag 14-0 Context direction specification flag 17-1 Bank number specification register 4-011 Set to In this case, the value of bank number register 16 is 011.
The operation is as shown in Table 4.

Table 4 (Effects of the Invention) As described above, according to the present invention, since the total number of register files is specified and the context is performed using the register files in order, no overhead is generated. A high-speed context can be realized, the throughput of the system can be improved, and a real-time processing system can be easily realized.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the schematic structure of the multitask execution device, FIG. 2 is a timing diagram showing the sequence of the multitask execution device, and FIG. 3 is a block diagram showing the configuration of the bank selection section of the multitask execution device. be. 1... Register file group 2... Register file 3... Bank selection section 4... Bank number designation register 6... Bank number counter 10... Context execution means 14... Bank 0 flag 15 ... Adder 16 ... Bank number register 17 ... Context direction designation flag 18 ... Inverter menu 3

Claims (1)

[Claims] (1) In a multi-bank system consisting of a plurality of register files, a register file number specifying means for specifying the total number of register files for performing context, and the number of register files specified by the register file number specifying means are sequentially used. 1. A multitask execution device comprising: context execution means for automatically executing a context.