PROVIDING INDIRECT DATA ADDRESSING FOR A CONTROL BLOCK AT A CHANNEL SUBSYSTEM OF AN I/O PROCESSING SYSTEM
摘要
An computer program product, apparatus, and method for facilitating input/output (I/O) processing for an I/O operation at a host computer system configured for communication with a control unit. The computer program product is provided for performing a method including: sending a transport command word (TCW) to an I/O subsystem, the TCW specifying a location address and indicating whether the TCW directly or indirectly addresses a message; extracting the location address from the TCW; obtaining the message from the specified location address based on the TCW indicating direct addressing, the message including the one or more I/O commands; gathering the one or more I/O commands from command locations specified by a list of addresses identified by the specified location address to form the message based on the TCW indicating indirect addressing; and generating a message including the one or more I/O commands.
申请公布号
EP2245545(A1)
申请公布日期
2010.11.03
申请号
EP20090710800
申请日期
2009.02.09
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
CASPER, DANIEL;FLANAGAN, JOHN;HUANG, CATHERINE;KALOS, MATTHEW;NJOKU, UGOCHUKWU;RIEDY, DALE;SITTMANN III, GUSTAV