System for transferring I/O data between an I/O device and an ap

Details System for transferring I/O data between an I/O device and an ap System for transferring I/O data between an I/O device and an ap

1998-02-27

2000-03-28

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Data transfer specifying

710 4, 710 37, 709229, 709301, 709302, 370397, 370399, G06F 1314, G06F 1517

Patent

active

060444150

ABSTRACT:
A virtual connection created between an application program and a selected I/O device is used as a communications medium for controlling I/O processing of the I/O device by the application program. The virtual connection is implemented as a system area network connecting a process of the application program and the I/O device. The application program registers the application program's memory that the application program shares with the I/O device (i.e., gives access rights to the I/O device) with the system area network. Once the virtual connection is created and initialized, the application program uses the virtual connection to send request messages for I/O services to the I/O device and to receive reply messages from the I/O device. The I/O device uses the virtual connection to obtain source data from the application program's memory for I/O write operations and to transfer data to the application program's memory for I/O read operations.

REFERENCES:
patent: 5446915 (1995-08-01), Pierce
patent: 5758182 (1998-05-01), Rosenthal et al.
patent: 5790804 (1998-08-01), Osborne
patent: 5915124 (1999-06-01), Morris, III
"Virtual Interface Architecture Specification", Version 1.0, Dec. 16, 1997, Compaq Computer Corp., Intel Corp., Mircosoft Corp., pp. 1-83.
"Intelligent I/O (1.sub.2 0) Architecture Specification", Version 1.5, Mar. 1997, I.sub.2 O Special Interest Group, pp. 1-1 through 2-23.

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