Page of GA22-7000-4 Revised September 1, 1975
By TNL: GN22-0498
Summary of Machine-Check Masking
Subclass Condition SD System Damage
PD Instruction Processing Damage
TD Timer Damage
CD Timing Facilities Damage SR System Recovery
ED External Damage
DG Degradation
W Warning
Explanati on:
P Indication held pending.
Subclass Mask
EM
EM
RM
EM
DM
WM
Action When CPU Disabled for Condition
Check-Stop Control = 0 P*
P*
P
P
Y
P
P
P
Check-Stop Control = 1
Check stop
Check stop
P
P
Y
P
P
P
Y Indication may be held pending or may be discarded.
* In this situation, the system integrity may have been lost, and the system cannot be considered dependable.
Machine-Check Condition Masking PSW Bit 13
o
AFL Control
SMCEL Control
CR 14 Bit 1
X
o
o
AMCEL Control
CR14Bit8
X
o
o
Machine-Check Extended Logout Action
No MCEL
No MCEL
MCEL may occur only during machine-check interruption.
1
MCEL may occur at any time.
2
MCEL may occur at any time.
Fixed Logout Action
o CPU portion of fixed logout area may be changed only during machine-check interruption.
1
CPU portion 'Of fixed logout area may be changed at any time.
Explanation:
X Indicates the same action occurs whether the bit is zero or one.
Logout prior to instruction retry is not permissible in this state even though recovery reports are enabled.
2 In some models the AMCEL mask bit is ignored, and no logout occurs in this state.
Machine-Check Logout Control
Control Register 14 State of Bit on Initial Bit Description Bit Position Program Reset CS Check-stop control 0 SL Synchronous MCEL mask 1 IL IOEL control 2 0 RM Recovery report mask 4 0 DM Degradation report mask 5 0 EM External damage report mask 6 1
WM Warning mask 7 0 AL Asynchronous MCEL control 8 0 FL Asynchronous fixed logout control 9 0 Machine-Check Control Register Bits
Machine-Check Handling 183
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