IBM Professional Series - Appendix A. CP CMS Interface; Privileged Operation Simulation; Set Storage Key - SSK; Insert Storage Key - ISK

Appendix A. CP / CMS Interface
Privileged Operation Simulation
The following privileged operations are supported:
Set Storage Key - SSK
• Insert Storage Key - ISK
Set System
Mask - SSM
•
Load PSW - LPSW
Test I/O - TIO
• Store
CPU ID - STIDP
• Set
Clock - SCK
Set PSW
Key from Address - SPKA
• Insert PSW Key - IPK
• Set
CPU Timer - SPT
• Store
CPU Timer - STPT
Privileged operations not listed above are not supported and,
if executed, will cause an operation program check to be
reflected to the Virtual Machine. Operations listed above
but not described below, function as described in the
System/370 Principles of Operations.
For privileged operations which modify the PSW, only the
BC format of the
PSW is supported.
Set Storage Key - SSK
The hardware does not support storage protection, but
storage keys can be set
and may be retrieved by the ISK
instruction. The Fetch Protect and Dynamic Address
Translation bits (4-6) are ignored.
Insert Storage Key - ISK
The requested storage key is returned as set by the SSK
instruction, but the Fetch Protect and Dynamic Address
Translation bits (4-6) will always
be zero.
Appendix A. CP / CMS Interface A-I