JPH0340160A - Input/output system - Google Patents

Abstract

PURPOSE:To process a list of physical addresses with use an inexpensive DMA controller by preparing a means which calculates the continuous physical addresses based on the physical address list and starts an address list process means to set these physical addresses to a DMA controller. CONSTITUTION:When an input/output request is produced, an address list process means 15 calculates the continuous physical addresses to be set to a DMA controller 12 based on a list of physical addresses in accordance with the starting interval of a driver start means 16. These continuous physical addresses are set to the controller 12. Then the controller 12 performs the input/output operations to the memories of those set addresses. Thus it is possible to perform the input/output operations based on the physical address list and with use of the inexpensive controller 12 having no function to process the physical address list.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a turnout system for inputting and outputting data to and from peripheral devices in a computer system.

4 shows a block diagram of a conventional input/output system, in which 41 is a disk device such as a floppy disk, and 42 is a DMA controller that performs DMA transfer;
43 is a target buffer to be input/output, 44 is an address list generation means for checking the state of physical addresses of the target buffer and generating a list of physical addresses for each physically continuous area, and 45 is an address list generation means generated by the address list generation means. This is address list setting means for setting a list of physical addresses in the DMA controller. In the conventional people-output system configured as described above, when an input/output request occurs, the address list generation means 44 outputs
The continuity of the physical addresses of the target buffer 43 is checked, the target buffer 43 is divided into physically continuous areas, and pairs of the start address of each area and the size of the area are created as many as the number of divided areas. Next, the created list of physical addresses is passed to the address list setting means 45, and the address list setting means 45 sets the address list in the DMA controller 42.

The DMA controller 42 transfers data between the disk device 41 and the target buffer 44 while processing the address list.

However, with the above configuration, the DMA controller must process the list of physical addresses.However, the DMA controller with such a function has the problem of being expensive. In view of this, it is an object of the present invention to provide an input/output system that processes a list of physical addresses using an inexpensive MA controller that does not have the function of processing a list of physical addresses.

Means for Solving the Problem The present invention calculates physically contiguous physical addresses to be set in a DMA controller from a list of physical addresses.
This input/output system is characterized by comprising an address list processing means for setting the address in a DMA controller and a driver starting means for starting the address list processing means.

According to the above-described structure, when an input/output request occurs, the address list processing means selects a DMA from the list of physical addresses according to the interval of activation from the driver activation means.
Calculate physically contiguous addresses to set in the controller. Set the addresses in the L DMA controller.

Thereafter, the DMA controller performs human output to the memory at the set address. By doing so, it is possible to perform input/output using a list of physical addresses using an inexpensive MA controller that does not have the function of processing a list of physical addresses.

Embodiment Fig. 1 is a block diagram of a people flow system in an embodiment of the present invention @ Fig. 2 is a data structure of a list of physical addresses @
FIG. 3 is a flowchart showing the input/output procedure. In FIG. 1, 11 is a disk device such as a floppy disk 12 is a DMA controller that performs DMA transfer;
3 is a target buffer to be input/output; 14 is address list generation means for checking the state of the physical addresses of the target buffer and generating a list of physical addresses for each physically continuous area; and 15 is an address list generation means generated by the address list generation means. I) An address list processing means that calculates physically consecutive addresses to be set in the MA controller from the physical address and sets the addresses in the DMA controller. Reference numeral 16 denotes a driver startup method 17 for starting an address list processing means, a driver internal buffer that temporarily stores data for the fractional memory, and 18 a fractional memory processing means that transfers data between the driver internal buffer and the target buffer. In Figure 2, 211, 21
2 is the start address and size of the first physically contiguous area of the target buffer to be input/output, 2
21 and 222 are the start address and size of the second physically contiguous area of the target buffer to be input/output, respectively. 231 and 232 are the start address and size of the third physically contiguous area of the target buffer to be input/output, respectively. Starting address and size 24] and 242 are the starting address and size of the fourth physically contiguous area of the target buffer to be input/output, respectively. Regarding the turnout system of this embodiment configured as described above,
The operation will be explained below. A data reading request is issued to the desk device 11, and the address list processing means 1
5 considers the case where the driver activation means 16 activates the transfer unit in units of 512 bytes. Input/output (input/output) is performed as follows according to the flowchart in FIG. Generates a list of physical addresses and passes the list of physical addresses to the address list processing means 15 1e
The address list processing means 15 (Dai) looks at the data 211 and 212 regarding the first area of the target buffer, and
It is determined whether 512 bytes of memory, which is a unit of transfer, is physically continuous. If continuous, address 2
11 and size 512 bytes as the DMA controller 12
Set to . Then, the DMA controller 12 performs data transfer. Judgment result: Not consecutive ＼ In other words, when performing memory rounding (
The physical address and size of 512 bytes are set in the DMA controller 12. And DMA controller 1
2 is the driver's internal buffer (transfers data to 7).
＼ When the data transfer is completed, the fractional memory processing means 18
is from driver internal buffer 17 to target buffer 13
Transfer data by the actual fractional size. Next, the address list processing means 15 (Yo driver starting means 16)
When activated by When the process of engraving in a certain area is completed, the process for the next area is performed.\ When the process for the last area is completed, the entire process is completed.As described above, according to this embodiment, the EDMA controller has a length of 512 mm.
If you have the ability to transfer data to bytes of physical memory, you can transfer data to physically discontinuous target buffers.

As described in detail, according to the present invention, it is possible to perform input/output using a list of physical addresses using an inexpensive MA controller that does not have the function of processing a list of physical addresses, and its practical effects It's thick.

[Brief explanation of drawings]

Figure 1 shows the blocks of the people-output system according to the embodiment of the present invention, Figure 2 shows the data structure of the list of physical addresses, Figure 3 is a flowchart showing the input/output procedure, and Figure 4 shows the conventional input-output system. It is a block diagram. 11... Disk storage 12... DMA controller, 13... Target buffer, 14
. . . address list generation means, 15 . . . address list processing means, 16 . . . driver activation means, 1
7... Driver internal buffer, 18... Fractional memory processing means, 211.221.231241... Start address input 212.222.232.242...
the size

Claims (2)

[Claims] (1) Address list generation means for checking the state of physical addresses of the input/output target memory and generating a list of physical addresses for each physically continuous area; The present invention is characterized by comprising an address list processing means for calculating a physical address of a physically continuous memory to be set and setting the address in a DMA controller, and a driver starting means for periodically starting the address list processing means. input/output system. (2) In the unit processed by the address list processing means, if a fractional memory is generated when physically continuous memory indicated by the list of physical addresses generated by the physical address generation means is processed, the data for the fractional memory is temporarily stored. The input device according to claim 1, further comprising: a buffer within the driver for storing data; and fraction memory processing means for transferring data between the buffer within the driver and the input/output target memory. output system.