Installation guide

8-4 System Errors
Table 8-1 Machine Check Frame Parameters (Continued)
Table 8-2 Machine Check Codes in the Stack Frame
Longword Bits Contents
<7> VR. The VAX Restart bit, which is used to commu-
nicate restart information between the microcode
and the operating system. When set, this bit indi-
cates that no architectural state has been changed
by the instruction that was executing when the er-
ror was detected. When clear, it indicates that ar-
chitectural state was modified by the instruction.
SP+28
<31:0> PC. The value of the program counter at the time
of the fault.
SP+32
<31:0> PSL. The value of the processor status longword at
the time of the fault.
Code Description Restart Condition
01
Unknown memory manage-
ment fault parameter re-
turned by Mbox
(VR
1
= 1) or (PSL<FPD>
2
= 1)
02
Illegal interrupt ID value re-
turned in INT.SYS
(VR = 1) or (PSL<FPD> = 1)
03
Illegal microcode dispatch (VR = 1) or (PSL<FPD> = 1)
04
Illegal combination of state
bits detected during string
instruction
(PSL<FPD> = 1)
05
Asynchronous hardware er-
ror
Recovery is generally not pos-
sible.
06
Synchronous hardware error Recovery and retry are possi-
ble.
1
VR is the VAX restart bit in the machine check stack frame.
2
FPD (First Part Done) is PSL <27>.