gtpi1m0vSystem Installation Support Reference

CPU Timer Interrupt

User exit routine UCCCPTI is invoked whenever a CPU timer clock interrupt is taken and the exit point named CPTI is active. Exit point CPTI is contained in CSECT CCNUCL.

This exit point has been provided to allow the user exit routine to be invoked when an external CPU timer interrupt is received. The exit will be invoked from both the main and application I-streams.

General Conditions at Entry

The registers at entry to UCCCPTI are:

R11-R15
See User Exit Routines - Common Entry Conditions.

System Conditions at Entry

System state
Supervisor

System mask
Masked

Protect key
0

Address Space
SVM.

Programming Considerations at Entry

See User Exit Routines - Common Programming Considerations for other considerations.

Programming Considerations on Return

See User Exit Routines - Common Return Conditions.

General Conditions on Return

See User Exit Routines - Common Return Conditions.