IBM PPC440X5 CPU Core, User Manual

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MCSR
Machine Check Status Register
PPC440x5 CPU Core User’s Manual
Preliminary
Page 500 of 589
regsumm440core.fm.
September 12, 2002
MCSR
SPR 0x23C Supervisor Read/Clear
See Machine Check Status Register (MCSR) on page 174.
Figure 10-34. Machine Check Status Register (MCSR)
0 MCS
Machine Check Summary
0 No async machine check exception pending
1 Async machine check exception pending
Set when a machine check exception occurs
that is handled in the asynchronous fashion.
One of MCSR bits 1:7 will be set simulta-
neously to indicate the exception type. When
MSR[ME] and this bit are both set, Machine
Check interrupt is taken.
1 IB
Instruction PLB Error
0 Exception not caused by Instruction Read PLB
interrupt request (IRQ)
1 Exception caused by Instruction Read PLB interrupt
request (IRQ)
2 DRB
Data Read PLB Error
0 Exception not caused by Data Read PLB interrupt
request (IRQ)
1 Exception caused by Data Read PLB interrupt
request (IRQ)
3 DWB
Data Write PLB Error
0 Exception not caused by Data Write PLB interrupt
request (IRQ)
1 Exception caused by Data Write PLB interrupt
request (IRQ)
4 TLBP
Translation Lookaside Buffer Parity Error
0 Exception not caused by TLB parity error
1 Exception caused by TLB parity error
5 ICP
Instruction Cache Parity Error
0 Exception not caused by I-cache parity error
1 Exception caused by I-cache parity error
6 DCSP
Data Cache Search Parity Error
0 Exception not caused by DCU Search parity error
1 Exception caused by DCU Search parity error
Set if and only If the DCU parity error was dis-
covered during a DCU Search operation.
See Data Cache Parity Operations on
page 129.
7 DCFP
Data Cache Flush Parity Error
0 Exception not caused by DCU Flush parity error
1 Exception caused by DCU Flush parity error
Set if and only If the DCU parity error was dis-
covered during a DCU Flush operation.
See Data Cache Parity Operations on
page 129.
8 IMPE
Imprecise Machine Check Exception
0 No imprecise machine check exception occurred.
1 Imprecise machine check exception occurred.
Set if a machine check exception occurs that
sets MCSR[MCS] (or would if it were not
already set) and MSR[ME] = 0.
9:31 Reserved
0 1 2 3 4 5 6 7 8 9 31
MCS
DWB IB
DRB
IMPE TLBP
ICP DCFP
DCSP