KR0131860B1 - Apparatus for input/output of console in multiprocessor system and method of the same - Google Patents

Abstract

DISCLOSURE OF THE INVENTION The present invention is to prevent a problem of the system according to the input / output control process with a console equipped with a system controller of a multiprocessor system having a dedicated input / output processor. The port of a two-port general purpose asynchronous transceiver (DUART) The text input through the system is transferred to the desired area by the main processor of the system or the character is output to the port of the DUART designated by the main processor.

The present invention initializes the registers of the console input / output device, buffers and queues for transmission and reception, and then executes an input / output command for providing a service in the form defined in the message transfer protocol at the time when the console input / output is required. In conjunction, it controls data flow and handles interrupts.

Description

Console I / O Drive in Multiprocessor System and Its Method

1 is a diagram showing the basic structure of a system to which the present invention is applied.

2 is a view for explaining the interface method between the main processor and the present invention.

3 is a block diagram of the present invention.

4 is a flowchart showing a function execution process of an interrupt handler.

* Description of the symbols for the main parts of the drawings *

1: main processor 2: system controller

3: I / O processor 4: shared memory

5: 2-port general purpose asynchronous transceiver 6: Sequential I / O port

7: Console 100: Console I / O Driver

The present invention relates to a character input / output control process with a console (con-sole) mounted on a system controller of a multiprocessor system having an input / output dedicated processor. More specifically, a two-port general purpose asynchronous transceiver (hereinafter referred to as 'DUART') The present invention relates to an apparatus and method for transmitting a character inputted by determining a port of a terminal) to a desired area of a system main processor or outputting a character to a port of a DUART designated by the main processor.

A fast medium sized computer, such as a supermini or mainframe, is typically referred to FIG. 1 with a number of main processors 1, a system controller 2, an input / output processor 3 and a main memory. The shared memory 4, which is a device, has a tightly coupled multiprocessor structure connected to the system bus 8, and a symmetric operating system is mounted and operated.

The kernel of the operating system is executed in the main processor 1.

In this system, all inputs and outputs are made by message transmission between the kernel in the main processor 1 and the system controller 2.

In systems such as personal computers and minicomputers, console I / O is implemented at the kernel level of the operating system (i.e. only by software) .In high speed medium computers such as multiprocessor systems, console I / O is implemented at the kernel level due to the hardware structure of the system. In this case, due to the difference in data processing speed between the console and the system, the main processor 1, which actually executes the kernel, may be inefficiently executed.

An object of the present invention is to improve performance degradation of a system due to console input / output control in a high speed computer system.

Another object of the present invention is to provide a console input / output driving apparatus and a driving method thereof, which can increase the work performance of the main processor even when controlling the console input / output in a multiprocessor system.

In order to achieve the above objects, the present invention provides a console input / output driving apparatus capable of performing a dedicated control function at the firmware level of a lower control function for a console to satisfy a console input / output requirement of a kernel when a console input / output is desired. do.

According to one aspect, a console input / output driving apparatus of the present invention for driving the input / output of a console in a multiprocessor system in which a plurality of main processors, a system controller, an input / output processor and a shared memory are tightly coupled to a system bus, respectively, A two-port universal asynchronous transceiver (DUART) connected between the console and the console and having two ports, and a console driver for input / output driving of the console; Data transmission between the main processor, the console driver and the DUART is performed in character units, and information exchange between the main processor and the console driver uses the shared memory and interrupts according to a message transfer protocol. It consists of; The console driver sequentially transfers first queue means for receiving parallel data from the kernel of the main processor, converting the serial data into serial data, and outputting the information provided from the first queue means to the registers of the DUART. A first buffer means for receiving data, a second buffer means for receiving data provided serially from the registers of the DUART, and serial data provided from the second buffer means for converting the serial data into parallel data. Second queue means for providing the kernel, and interrupt processing means for processing interrupts for console input and output.

According to the method of the present invention, after the registers of the console input / output values initialize buffers and queues for transmission and reception, an input / output command for providing a service in the form defined in the message transfer protocol is performed at the time when the console input / output is required. In conjunction with this, it controls the data flow and handles interrupts.

Hereinafter, the present name will be described in detail with reference to the accompanying drawings. Referring to FIG. 1, the system controller 2 according to the present invention includes one DUART 5 having two sequential I / O ports 6 as shared resources, and a program for driving the console I / O embedded therein. A PROM (Programmable Read Only Memory) 7 mounted thereon is provided.

The apparatus and method according to the invention are realized by the system controller 2 performing a control function in accordance with the instructions recorded in the PROM.

2 illustrates an interface method between a main processor 1 in which a kernel of an operating system is mounted, and a console driver 100 implemented in the system controller 2.

The exchange of information between the main processor 1 and the console driver 100 uses a shared memory 4 according to the Message Passing Protocol (MPP) and a message transfer method using interrupts.

The message 10 transmitted between the main processor 1 and the console driver 100 includes information for inputting and outputting the console.

The Message Transfer Protocol (MPP) defines the console I / O commands that the kernel can request.

These I / O commands include initialization, read, write, stop / resume input data flow, input data output, mode conversion, buffer and queue flush, modem control, hangup, parameter setting command, etc. have.

The kernel in the main processor 1 writes an I / O command in a message and transmits it to the console I / O driver 100 so that a console I / O request is generated.

Upon receipt of a message from the kernel, the console I / O driver 100 performs a corresponding service by calling a function that performs an I / O command according to the I / O command recorded in the message, and then returns the status and the result (if necessary). By returning to the kernel via, the one execution cycle to complete the service is terminated.

3 shows the configuration of the driver 100 according to the present invention.

The console driver 100 of the present invention is connected between the main processor 1 and the DUART (5). Data transmission between the main processor 1, the console driver 100, and the DUART 5 is performed in units of characters.

The console driver 100 receives the parallel data from the kernel of the main processor 1, converts it into serial data and outputs the serial data, and transmits the information provided from the transmission queue 101 to DUART ( A transmitting buffer 102 for sequentially transferring to the registers 107, 109 of 5), and a receiving buffer for receiving serial data provided from the registers of the DUART 5; 103, a receiving queue 104 which converts serial data provided from the receiving buffer 103 into parallel data and provides it to the kernel of the main processor 1, DUART 5 and transmitting buffer 102. And an interrupt handler 105 that handles the interrupt of the receive buffer 103.

In addition, when the echo flag is set, the output of the reception buffer 103 is provided to the transmission queue 101.

The transmission queue 101, the transmission buffer 102, the reception buffer 103, and the reception queue 104 for managing data and control information are configured in a local memory of the system controller 2.

The data flow control between the kernel of the main processor 1, the buffers 102 and 103 and the queues 101 and 104 of the console driver 100, and the DUART 5 is based on the interrupt processing function of the interrupt processor 105 and the system. This is performed by linkage of data flow control processing functions in the controller 2.

When the main processor 1 (more specifically, the kernel) requests data input from the console, when a character is input by the console keyboard or the like, the character is once input to the data registers 107 and 109 of the DUART 5. Stored.

The character data stored in the data register of the DUART 5 is transferred to the main processor 1 kernel through the reception buffer 103 and the reception queue 104.

At this time, if the echo flag is set, the output of the reception buffer 103 is also transmitted to the transmission queue 101 at the same time and echoed on the screen.

In this case, however, the monitor daemon runs unless it is in kernel mode.

When the kernel in the main processor 1 requests data output to the console, the kernel first provides the character data to be output to the console to the transmission queue 101 of the console driver 100.

The serial output of the transmission queue 101 is provided to the data register of the DUART 5 via the transmission buffer 102 and output to the terminal which is the console.

The buffers 102 and 103 and the queues 101 and 104 reduce the overhead of data and message traffic due to frequent data transmission and reception to perform a quick response and prevent data loss.

4 is a flowchart illustrating a functional process of the interrupt handler 105.

Referring to FIG. 4, the interrupt handler 105 alternately performs interrupt processing on two ports of the DUART 5 in accordance with a request of the kernel. Interrupt processing of the interrupt handler 105 according to the console input / output request of the kernel includes reception processing for delivering data stored in the data registers 107 and 109 of the DUART 5 and data from the kernel to the data of the DUART 5. It is divided into transmission processing to transfer to register.

First, when there is a console input / output request of the kernel, the interrupt register 105 reads the status registers 106 and 108 of the DUART 5 for interrupt processing for one port of the DUART 5, and the DUART 5 receives the processing. It is checked whether it is in a ready state (401). If it is found that it is in a ready state for receiving processing, it reads data from the data register of DUART (5) (402). Then, it is checked whether the read data is the data transmitted from the console device and the character data for changing the mode (403). At this time, if the read data is found to be data for mode conversion (YES in step 403), the mode is switched (404), and then whether the processing up to now has been for the second port is checked ( 405).

If it is found in step 405 above that the process was not for the second port, then branch to step 401 to further perform interrupt processing for the second port.

At this time, if it is determined that the processing was for the second port, the interrupt processing for the console input / output request of the kernel is terminated.

On the other hand, if it is found in step 403 that the read data is not data for mode switching (No), it is checked whether the current mode is the console mode (406).

At this time, if it is determined that the current mode is not the console mode (NO in step 406), the monitor function is performed and the process returns to step 405 described above. In step 406 above, if the current mode is found to be in console mode ('Yes'), character data and status data are written to the reception buffer 103 (408).

As a result, data from the console is provided to the kernel of the main processor 1 through the reception buffer 103 and the reception queue 104 to perform reception processing. When the reception process is completed (see step 408) or when the reception process is not ready (NO in step 401), the interrupt handler 105 reads the state registers 106 and 108 of the DUART 5, It is checked whether the DUART 5 is in a transmission processing ready state (409), and if it is determined that the DUART 5 is not in the transmission processing ready state (NO in step 409), the process returns to step 405.

In step 409, if the DUART 5 is found to be ready for transmission processing (YES), it is checked whether there is data to be transmitted (data to be output to the console) (410).

In the above step 410, if it is determined that there is data to be transmitted (YES), the data of the transmission buffer 102 is written to the data register of the DUART 5 (411), and then returned to the step 405. do.

Data from the kernel is transferred to the console by writing the data of the transmission buffer 102 to the data register of the DUART 5.

In step 410 above, if it is determined that there is no data to transmit ('No'), the transmission interrupt is disabled (412), and then the flow returns to step 405.

As described above, according to the present invention, the console entry / exit driver configured in the system controller improves the efficiency of the system so that the overhead of the main processor can be reduced by directly processing the character input to or output from the console. It is effective to let.

Claims (3)

Consoles for driving the input and output of the console in a multiprocessor system in which a plurality of main processors 1, a system controller 2, an input / output processor 3 and a shared memory 4 are tightly coupled to the system bus 8, respectively. An input / output drive device; A two-port universal asynchronous transceiver (DUART) 5 connected between the system controller 2 and the console and each having two ports, and a console driver 100 for input / output driving of the console; Data transmission between the main processor 1 and the console driver 100 and the DUART 5 is performed in units of characters, and information exchange between the main processor 1 and the console driver 100 is a message transfer protocol. According to the message transmission method using the shared memory 4 and using an interrupt; The console driver 100 receives first parallel data from the kernel of the main processor 1, converts the serial data into serial data, and outputs the serial data from the first queue means. First buffer means 102 for sequentially transferring to the registers of the DUART 5, second buffer means 103 for receiving data provided in series from the registers of the DUART 5, A second queue means 104 for converting serial data provided from the second buffer means into parallel data and providing it to the kernel of the main processor 1, and an interrupt processing means for processing an interrupt for console input / output ( 105); The interrupt processing means reads the state register of the DUART 5 when the console input / output request of the kernel is checked to determine whether the DUART 5 is in a reception processing ready state, and turns out to be in a reception processing ready state. If data is read from the data register of the DUART (5), the read data is data transmitted from the console device, and whether or not it is character data for mode conversion is determined. If the mode is changed and the read data is found to be not the mode for mode conversion, it is checked whether the current mode is the console mode, and if it is determined that the mode is not the console mode, the monitor function is performed. If it is determined that the console mode, the character data and status data is recorded in the second buffer means 103. When the reception processing is completed or when the reception processing is not ready, the state register of the DUART 5 is read to check whether the DUART 5 is in the transmission processing ready state, and is ready for transmission processing. If it is found that the data is transmitted, it is examined whether there is data to be transmitted; if it is found that there is data to be transmitted, the data of the first buffer means 102 is recorded in the data register of the DUART 5; If the data to be transmitted is found to be absent, the transmission interrupt is disabled and the processing so far is completed after the above mode change, monitor function execution, data register writing, transmission interrupt disabling is completed or transmission preparation is not completed. Investigate whether it was processing for the second port, and if it turns out that it was not processing for the second port, And performing an interrupt process for the port, and terminating the interrupt process for the console I / O request of the kernel if it is determined that the process was for the second port. 2. The second buffer means (103) according to claim 1, wherein the second buffer means (103) provides its output to the first queue means (101) in response to the control of the interrupt processing means (105) when the echo flag is set. Console input and output drive device of the multi-processor system. A plurality of main processors 1 and a system controller 2. A two-port universal asynchronous transceiver (DUART) 5 connected between the input / output processor 3, the shared memory 4, the system bus 8, the system controller 2 and the console and having two ports; It includes a console driver 100 for driving the input and output of the console; The console driver 100 includes a transmission queue and a transmission buffer connected in series between the main processor 1 and the DUART 5 to transfer data from the main processor 1 to the console, In order to transfer data from the console to the main processor (1), the DUART (5) receiving buffer and reception protocol connected in series between the main processor 1, and for transmitting and receiving data between the main processor and the DUART An interrupt processor for performing interrupt processing; data transmission between the main processor 1, the console driver 100, and the DUART 5 is performed in units of characters, and the main processor 1 and the console. The exchange of information between the drivers 100 drives the input / output of the console in the multiprocessor system which uses the shared memory 4 and the message transfer method using interrupts according to the message transfer protocol. In the method for; if the console I / O request of the kernel of the operating system mounted on the main processor, the interrupt processor reads the status register of the DUART (5) to check whether the DUART is in the ready to receive processing (401, 402) to read data from the data register of the DUART (5) when it is determined that the receiver is ready to receive processing; Investigate whether the read data is data transmitted from the console device and whether it is character data for mode conversion (403), and if it is determined that the data is for mode conversion, mode conversion (404). After that, it is checked whether the processing up to now was processing for the second port (405), and if it is found that the processing was not for the second port, the DUART reception processing preparation is performed to further perform interrupt processing for the second port. Checking the status and terminating the interrupt processing for the console input / output request of the kernel if it is determined that the processing was for the second port; If the read data is found to be not the data for the mode conversion, it is checked whether the current mode is the console mode (406), and if the current mode is found not to be the console mode, the monitor function is performed. Checking whether the second port is processed or not, and if it is determined that the current mode is the console mode, recording the read data into the receiving buffer (408); Receiving, by the reception queue, serial data provided from the reception buffer and converting the serial data into parallel data and providing the serial data to the kernel of the main processor (1); When there is a console output request from the kernel of the main processor 1, parallel data from the kernel is accepted by the transmission queue and converted into serial data, and the transmission buffer accepts serial data from the transmission queue. Step; When the reception process is completed or when the reception processing of the DUART is not ready, the interrupt processor reads the status register of the DUART to check whether the DUART is in a transmission processing preparation state (409). If it is determined that it is not in the processing ready state, performing a process checking step for the second port; and if it is determined that it is in the processing ready state, investigating whether there is data to be transmitted (410); If the data to be transmitted is found to exist, the data of the transmission buffer is written to the data register of the DUART (411). If the data to be transmitted is found to be absent, the transmission interrupt is disabled (412). And performing a step of checking whether or not a processing is performed for a second port of the console.