JPS59177634A - Counting system of length of all input data in input buffer - Google Patents

Abstract

PURPOSE:To count the length of all input data with a less number of execution steps independently of the length of input data by deriving the length of all input data on a basis of the number of the last used input buffer, the size of input buffers, etc. CONSTITUTION:The length of all input data is obtained on a basis of the number of the last used input buffer, the size of input buffers, a left byte count of CSW, etc. For example, when input data is read into input buffers 5-1-5-5 on a memory 4 of a CPU 1 from an input/output controller 3 through a channel device 2, areas H and L are set to input buffers 5-1-5-4 by the CPU 1 to generate a CCW 7, and sequential numbers are set to input buffers to issue a start instruction SIO. A CAW and the CCW are read in by the channel device 2, and the read CCW is executed, and the CSW in the channel device 2 is rewritten on a basis of the execution result. Then, the length of all input data is obtained on a basis of the number of the last used input buffer, lengths of areas L, and a left byte count l of the CSW by the CPU 1.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention comprises a central processing unit, a channel device, and an input/output control device. For multiple input buffers,
Input data is read from the input/output control device via the channel device using a channel command word that is data chained and has a serial number, and when calculating the length of the total input data read, the serial number is used to count the data. The present invention relates to a total input data length counting method for an input cover sofa.

[Prior art and problems]

FIG. 1 is a diagram showing an overview of the system configuration, and FIG. 2 is a diagram illustrating a conventional example of a method for calculating the number of input data of an input buffer. In the figure, 1 is a CPU (central processing unit), 2 is
is a channel device, 3 is an input/output control device, 4 is a memory, 5
-1 to 5-5 are input buffers, 6-1 to 6-5
is CCW (ChannelCommandWo)
r d ), 7 is CS W (Channel 5t
atusWOrd).

As shown in FIG. 1, in a system in which an input/output control device 3 is connected to a CPUI through a channel device 2,
A plurality of input buffers of a certain size are linked and prepared on the memory 4 of the PUI to correspond to the maximum amount of data to be read, and data from the input/output control device 3 is read into the input buffers via the channel. . In such cases, CCW (Channel Commander)
d Word (channel command word)
P U 1 requests the channel device 2 to read data. The channel device 2 fills the input buffer on the memory 4 with data from the input/output control device 3 while reading the CCW, but the manual buffer is filled with the maximum amount of data expected to be read as described above. Because they are prepared according to their capacity, they are not always full, and loading often ends midway through.

Figure 2 shows the input buffer and CCW before reading data. As shown in FIG. 2 (5), the manual buffers 5-1 to 5-5 consist of a control area and a data area. The control area is used to store control information such as data content and characteristics, and also has a pointer to the control area of the next input buffer. Also CCW6-1 to 6-5
point to the start address of the input data area, and are chained to the next CCW by the TIC command. In addition, in the prisoner in Figure 2, L is each human power buffer 5-1
Indicates the size of the data area from 5 to 5, and this value is fixed. FIG. 2(B) shows a state in which data has been read into such input buffers 5-1 to 5-5. In FIG. 2 (8), CS W (Chann
The channel status word (channel status word) is provided in a predetermined storage area of the CP'U, and is set immediately before the channel finishes executing a series of CCWs.The status includes normal completion, abnormal completion, and error. Status information such as , etc. is written, and the number of bytes remaining in the data area of the last user power buffer in which data is stored is written in the byte count.

In the CPUI, when data is read into the manual buffers 5-1 to 5-5 as described above, information on the amount of data read is required. Conventionally, a manual buffer 5-1 filled with data following the input buffer
The total length of the data is determined by counting the numbers from 5-3 to 5-3 and adding the number of data in the input cover sofa 5-4, which is filled halfway with the last data.

Therefore, in such a conventional method, the total read input data length is, for example, TOTALNUM=Oi DO person cover sofa pointer taco first person cover sofa number address REPEAT next input buffer address WHILE
(Data address in input buffer - final address)
; TOTALNUM=TOTALNUM+input buffer length END.

It is determined by TOTALNUM = TOTALNUM ten-person Kabuff γ length - 1°. Therefore, if the read input data length is long, the number of execution steps until the number of input data (TOTALNUM) is calculated is large, and the total number of source lines is large, making it difficult to read due to loops.

[Purpose of the invention]

The present invention is based on the above consideration, and when calculating the total input data length by reading input data into an input buffer prepared on the memory of a central processing unit via a channel device, the input data It is an object of the present invention to provide a method for counting the total input data length of an input buffer, which can count the total input data length with a small number of execution steps, regardless of the length.

[Structure of the invention]

To avoid this, the method for counting the total input data length of the input buffer of the present invention comprises a central processing unit, a channel device, and an input/output control device, and a plurality of input data lengths of a certain size prepared in the storage section of the central processing unit. For the linked input buffer,
When the input data from the input/output control device is read from the input/output control device via the channel device through the data chained channel command word, the total input data length of the input cover sofa is now calculated. In the data length counting method, the central processing unit is configured to provide a number setting unit in the manual input/(sofa) and input the input keyword(s) when creating the channel command word for reading data and the input couch. A number is set on the sofa according to the link order, and the setting position of the number and the size of the data storage area of the input buffer are memorized, and when the input data is read into the input buffer, the channel device , reads the channel command word from the central processing unit, executes the channel command word, and every time the channel command word is executed, the end state of the channel and the remaining number of channels in the channel state word provided in the channel device are calculated. When the channel information such as When a termination interrupt is applied to the processing device, the central processing device reads the number of the setting position of the number on the final servant's couch, multiplies the read number by the value of the size of the data storage area, The present invention is characterized in that it is configured to perform arithmetic processing to count the total input data length by subtracting the remaining byte count from the multiplied value.

[Embodiments of the invention]

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

FIG. 3 is a diagram illustrating the configuration of an embodiment of the present invention, FIG. 4 is a diagram illustrating the configuration of a buffer to which the present invention is applied, and FIG. 5 is a diagram illustrating an algorithm for calculating the number of input data according to the present invention. , FIG. 6 is a diagram illustrating the flow of data reading processing to which the present invention is applied. In the figure, 8 is a buffer area, 9 is a buffer management routine, 10 is a CCW and buffer creation section, 11 is a buffer post-processing routine, 12 is a counting processing section, 13 is a channel interface control routine, and 5-1 to 5 -5.6-1 to 6-5
and 7 indicate those corresponding to FIG.

The present invention sets a serial number according to the chain in the control area of the input buffer, and counts the total input data length based on the size of the input sofa, the serial number of the final servant's sofa, and the number of bytes remaining in the data area. That's what I'm trying to do. In FIG. 3, the buffer management routine 9 is
The sofa creation unit 10 manages the entire sofa, and the CCW and input buffer 10 points to the CCW and input buffer to form a chain, and input data according to the chain. It is used to set serial numbers for cute sofas. As shown in FIG. 4, the serial number is set at the position h from the beginning of the data area of the input cover sofa pointed to by the CCW. In addition, ■■
indicates the size of the control area, and L indicates the size of the data area. The buffer post-processing routine 11 performs processing after data has been read into the buffer, and when counting the number of input data, it sends a final message to the counting processing section 13.
Pass the sofa number, remaining number, and input buffer size, and output the number of input data obtained by the counting processing unit 13.
The channel interface control routine 14 controls the interface with the channel device.

A case where input data is read into the input buffers 5-1 to 5-5 as shown in FIG. 5 will be described. In FIG. 5, C3WPTR of C8W'7 points to the start address of the data area of the last employee Kakku Sofa 5-4. Therefore, as described above, the serial number of the last employee Kakkuso 5-4 is set to the address obtained by subtracting h from the first address. Therefore, assume that the serial number of the count section read according to that address is "4", and also assume that the serial number of the count part read according to that address is "4", and
If 3WL is l, the total input data length is 4-X
-L-1.

Next, the processing by the CPU and channel device when input data is read into the input buffer via the channel device will be explained with reference to FIG.

■ First, set h and L of the input buffer necessary to count the number of input data.

■ Create a CCW by filling in the RE A D command and the TIC command that points to the next CCW.

■ Set the serial number of the cover sofa.

■Issue startup command S.

When the above processing is performed in the CPU, the channel device will receive ■ CA W (Channel Address
0 ■ Read CCW.

■ Execute the loaded CCW.

■ Rewrite C8W in the channel device based on the executed results.

(2) Check whether the chain flag of the CCW previously executed in (2) is on and there is read data.

In the case of Yes, the process returns to step (2) and the same process is repeated. However, in the case of NO (the chain flag is off or there is no read φ data), the C8W on the main memory
After setting the C8W information of the channel device to
An end interrupt is sent to the CPU by the end (CE) or the device φ end (DE).

[Phase] The CPU checks the data count request bit, and if it is off, it is considered complete, but if it is on, all input data is obtained from the last user power buffer number, L, and the remaining byte count l of C8W. Count the total number of input data using the data length = number %L-1.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the number of the final servant cover sofa, the size of the cover sofa, C8
Since the total input data length is determined by counting the remaining bytes of W, even if the input data is long, the total input data length can be determined with a small number of execution steps, regardless of the length. Additionally, the number of source lines required to count the total input data length is reduced, making it easier to see.

[Brief explanation of drawings]

Figure 1 is a diagram showing an overview of the system configuration, Figure 2 is a diagram explaining a conventional example of a method for calculating the number of input data of an input buffer,
FIG. 3 is a diagram illustrating the configuration of an embodiment of the present invention, FIG. 4 is a diagram illustrating the configuration of a buffer to which the present invention is applied, and FIG. 5 is a diagram illustrating an algorithm for calculating the number of input data according to the present invention. , FIG. 6 is a diagram illustrating the flow of data reading processing to which the present invention is applied. 1... CPU, 2... Channel device, 3... Input/output control device, 4... Memory, 5-1 to 5-5...
・Input buffer, 6-1 to 6-5...CCW-,
7...C5W1S...Buffer area, 9...Buffer management routine, 10...CCW and buffer creation section, 11...Buffer post-processing routine, 12...Counting processing section, 13... Channel interface control routine. Patent Applicant: Fujitsu Limited Representative Patent Attorney Yotsube Kyotani

Claims (1)

[Claims] It is equipped with a central processing unit, a channel device, and an input/output control device, and sends a data chained channel written command word to an input buffer of a fixed size, which is prepared in the storage unit of the central processing unit and is linked to a plurality of input buffers. A method for counting the total input data length of an input buffer that calculates the total input data length when input data from the input/output control device is read via the channel device, and the central processing unit provides a number setting part in the input buffer, and when creating the channel command word for reading data and the input buffer, sets a number in the input buffer according to the link order, and also sets the setting position of the number. The size of the data storage area of the input buffer is memorized, and when input data is read into the manual buffer, the channel device reads a channel command word from the central processing unit and reads the channel command word. is executed, and each time it is executed, information on the channel such as the end status of the channel, remaining byte count, etc. in the channel status word provided in the channel device is rewritten, and when there is no more data to be input, the current channel When a termination interrupt is issued from the channel device to the central processing unit after setting the status word information in the channel status word provided in the main storage area of the central processing unit, the central processing unit stores the last used input buffer. Read the number at the setting position of the above number, multiply the read number by the value of the size of the data storage area, and subtract the remaining byte count from the multiplied value to obtain the total input data length. A total input data length counting method for an input buffer, characterized in that the input buffer is configured to perform counting calculation processing.