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Execute Channel Program in Real Storage
In IBM mainframe operating systems, Execute Channel Program in Real Storage (EXCPVR) is a supervisor call for low-level device access, where the programmer is responsible for providing a list of device-specific CCWs, that is, a channel program, to be executed by I/O channels, control units and devices. Additionally, the programmer is expected and required to ensure that the input/output data areas are in real storage and are "fixed".
==Relationship to Execute Channel Program (EXCP)==
EXCPVR may be viewed, historically, as a V=R (i.e., Virtual=Real) version of EXCP. However, EXCPVR is not restricted to V=R applications. Indeed, EXCPVR may refer to non-V=R data areas provided such data areas are "fixed" and the channel command words which reference such data areas have been translated from virtual to real addresses by the programmer using the LRA privileged instruction. EXCPVR was first introduced in SVS and was continued in MVS/370. Unlike EXCP, the user of EXCPVR must be authorized and must remain in supervisor mode and key throughout the EXCPVR process.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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