V/ord Bits Name of Field Associated with Initial Value 6 0 VM Assist Hardware Assist Value depends
upon virtual
machine
6 1 VM Problem State Hardware Assist Value depends
upon virtual
machine
6 2 lSI( & SSK Hardware Assist Value depends
upon virtual
machine
6 3 S/360 or S/370 instructions Hardware Assist Value depends
upon virtual
machine
6 4 Virtual SVC Interrupts Hardware Assist Value depends
upon virtual
machine
6 5 Shadow Table Fixup Hardware Assist Value depends
upon virtual
machine
6 6 CP Assist Hardware Assist Value depends
upon virtual
machine
6 7 Virtual Interval Timer Hardware Assist Value depends
upon virtual
machine
6 8-28 Real address of VM pointer list Hardware Assist Value depends
upon virtual
machine
8 16-31 Monitor Masks Monitoring Value depends
upon virtual
machine
9 0-3 PER 1 Event Masks Program-Event Recording Value depends upon
9 16-31 PER GPR Alteration Masks Program-Event Recording virtual machine.
lPER means program-event
recording. 10 8-31 PER Starting Address Program-Event Recording Value depends upon
virtual machine.
11 8-31 PER Ending Address Program-Event Recording Value depends upon
virtual machine.
Figure 73 (Part 2 of 3). Control Register Assignments
Appendix A. System/370 Information 539
Word Bits Name of Field Associated with Initial Value
14 0 Check-Stop Control Machine-Check Handling Value depends upon
14 1 Synchronous MCEL2 Control Machine-Check Handling machine check
14 2 110 Extended Logout Control Channel-Check Handling handler for the
14 4 Recovery Report Mask Machine-Check Handling virtual machine.
14 5 Degradation Report Mask Machine-Check Handling
14 6 External Damage Report Mask Machine-Check Handling
14 7 Warning Mask Machine-Check Handling
14 8 Asynchronous MCEL Control Machine-Check Handling
14 9 Asynchronous Fixed Log Ctrl. Machine-Check Handling
2MCEL means machine-check
extended logout.
15 8-28 MCEL Address Machine-Check Handling Points to extend 110 logout area
Figure 73 (Part 3 of 3). Control Register Assignments
Explanation:
The fields not listed are unassigned.
The initial value of unassigned register posiUions is unpredictable.
540 VM!SP System Programmer's Guide
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