ERR<n>MISC0 | Jon's Arm Reference

IMPLEMENTATION DEFINED error syndrome register. The miscellaneous syndrome registers might contain:

If the node that owns error record <n> implements a standard format Corrected error counter or counters (ERRFR[FirstRecordOfNode(n)].CEC != 0b000), then it is IMPLEMENTATION DEFINED whether error record <n> can record countable errors, and:

Configuration

This register is present only when error record n is implemented. Otherwise, direct accesses to ERR<n>MISC0 are RES0.

ERRFR[FirstRecordOfNode(n)] describes the features implemented by the node that owns error record <n>. FirstRecordOfNode(n) is the index of the first error record owned by the same node as error record <n>. If the node owns a single record then FirstRecordOfNode(n) = n.

For IMPLEMENTATION DEFINED fields in ERR<n>MISC0, writing zero returns the error record to an initial quiescent state.

In particular, if any IMPLEMENTATION DEFINED syndrome fields might generate a Fault Handling or Error Recovery Interrupt request, writing zero is sufficient to deactivate the Interrupt request.

Fields that are read-only, nonzero, and ignore writes are compliant with this requirement.

Note

Arm recommends that any IMPLEMENTATION DEFINED syndrome field that can generate a Fault Handling, Error Recovery, Critical, or IMPLEMENTATION DEFINED, interrupt request is disabled at Cold reset and is enabled by software writing an IMPLEMENTATION DEFINED nonzero value to an IMPLEMENTATION DEFINED field in ERRCTLR[FirstRecordOfNode(n)].

Attributes

Field descriptions

When ERRFR[FirstRecordOfNode(n)].CEC == 0b000 or error record n does not record countable errors:

IMPLEMENTATION DEFINED, bits [63:0]

IMPLEMENTATION DEFINED syndrome.

When ERRFR[FirstRecordOfNode(n)].CEC == 0b100, ERRFR[FirstRecordOfNode(n)].RP == 0 and error record n records countable errors:

IMPLEMENTATION DEFINED, bits [63:48]

IMPLEMENTATION DEFINED syndrome.

OF, bit [47]

Sticky overflow bit. Set to 1 when ERR<n>MISC0.CEC is incremented and wraps through zero.

OF	Meaning
0b0	Counter has not overflowed.
0b1	Counter has overflowed.

A direct write that modifies this field might indirectly set ERR<n>STATUS.OF to an UNKNOWN value and a direct write to ERR<n>STATUS.OF that clears it to zero might indirectly set this field to an UNKNOWN value.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

CEC, bits [46:32]

Corrected error count. Incremented for each Corrected error. It is IMPLEMENTATION DEFINED and might be UNPREDICTABLE whether Deferred and Uncorrected errors are counted.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

IMPLEMENTATION DEFINED, bits [31:0]

IMPLEMENTATION DEFINED syndrome.

When ERRFR[FirstRecordOfNode(n)].CEC == 0b010, ERRFR[FirstRecordOfNode(n)].RP == 0 and error record n records countable errors:

IMPLEMENTATION DEFINED, bits [63:40]

IMPLEMENTATION DEFINED syndrome.

OF, bit [39]

Sticky overflow bit. Set to 1 when ERR<n>MISC0.CEC is incremented and wraps through zero.

OF	Meaning
0b0	Counter has not overflowed.
0b1	Counter has overflowed.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

CEC, bits [38:32]

Corrected error count. Incremented for each Corrected error. It is IMPLEMENTATION DEFINED and might be UNPREDICTABLE whether Deferred and Uncorrected errors are counted.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

IMPLEMENTATION DEFINED, bits [31:0]

IMPLEMENTATION DEFINED syndrome.

When ERRFR[FirstRecordOfNode(n)].CEC == 0b100, ERRFR[FirstRecordOfNode(n)].RP == 1 and error record n records countable errors:

OFO, bit [63]

Sticky overflow bit, other. Set to 1 when ERR<n>MISC0.CECO is incremented and wraps through zero.

OFO	Meaning
0b0	Other counter has not overflowed.
0b1	Other counter has overflowed.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

CECO, bits [62:48]

Corrected error count, other. Incremented for each countable error that is not accounted for by incrementing ERR<n>MISC0.CECR.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

OFR, bit [47]

Sticky overflow bit, repeat. Set to 1 when ERR<n>MISC0.CECR is incremented and wraps through zero.

OFR	Meaning
0b0	Repeat counter has not overflowed.
0b1	Repeat counter has overflowed.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

CECR, bits [46:32]

Corrected error count, repeat. Incremented for the first countable error, which also records other syndrome for the error, and subsequently for each countable error that matches the recorded other syndrome. Corrected errors are countable errors. It is IMPLEMENTATION DEFINED and might be UNPREDICTABLE whether Deferred and Uncorrected errors are countable errors.

Note

For example, the other syndrome might include the set and way information for an error detected in a cache. This might be recorded in the IMPLEMENTATION DEFINED ERR<n>MISC<m> fields on a first Corrected error. ERR<n>MISC0.CECR is then incremented for each subsequent Corrected Error in the same set and way.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

IMPLEMENTATION DEFINED, bits [31:0]

IMPLEMENTATION DEFINED syndrome.

When ERRFR[FirstRecordOfNode(n)].CEC == 0b010, ERRFR[FirstRecordOfNode(n)].RP == 1 and error record n records countable errors:

IMPLEMENTATION DEFINED, bits [63:48]

IMPLEMENTATION DEFINED syndrome.

OFO, bit [47]

Sticky overflow bit, other. Set to 1 when ERR<n>MISC0.CECO is incremented and wraps through zero.

OFO	Meaning
0b0	Other counter has not overflowed.
0b1	Other counter has overflowed.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

CECO, bits [46:40]

Corrected error count, other. Incremented for each countable error that is not accounted for by incrementing ERR<n>MISC0.CECR.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

OFR, bit [39]

Sticky overflow bit, repeat. Set to 1 when ERR<n>MISC0.CECR is incremented and wraps through zero.

OFR	Meaning
0b0	Repeat counter has not overflowed.
0b1	Repeat counter has overflowed.

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

CECR, bits [38:32]

Note

The reset behavior of this field is:

On a Cold reset, this field resets to an architecturally UNKNOWN value.

IMPLEMENTATION DEFINED, bits [31:0]

IMPLEMENTATION DEFINED syndrome.

Accessing ERR<n>MISC0

Reads from ERR<n>MISC0 return an IMPLEMENTATION DEFINED value and writes have IMPLEMENTATION DEFINED behavior.

If the Common Fault Injection Mechanism is implemented by the node that owns this error record, and ERRPFGF[FirstRecordOfNode(n)].MV is 1, then some parts of this register are read/write when ERR<n>STATUS.MV is 0. See ERR<n>PFGF.MV for more information.

For other parts of this register, or if the Common Fault Injection Mechanism is not implemented, then Arm recommends that:

Note

These recommendations allow a counter to be reset in the presence of a persistent error, while preventing specific information, such as that identifying a FRU, from being lost if an error is detected while the previous error is being logged.

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
IMPLEMENTATION DEFINED
IMPLEMENTATION DEFINED

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
IMPLEMENTATION DEFINED																OF	CEC
IMPLEMENTATION DEFINED

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
IMPLEMENTATION DEFINED																								OF	CEC
IMPLEMENTATION DEFINED

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
OFO	CECO															OFR	CECR
IMPLEMENTATION DEFINED

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
IMPLEMENTATION DEFINED																OFO	CECO							OFR	CECR
IMPLEMENTATION DEFINED

ERR<n>MISC0: Error Record <n> Miscellaneous Register 0, n = 0 - 65534

Purpose

Configuration

Attributes

Field descriptions

When ERRFR[FirstRecordOfNode(n)].CEC == 0b000 or error record n does not record countable errors:

IMPLEMENTATION DEFINED, bits [63:0]

When ERRFR[FirstRecordOfNode(n)].CEC == 0b100, ERRFR[FirstRecordOfNode(n)].RP == 0 and error record n records countable errors:

IMPLEMENTATION DEFINED, bits [63:48]

OF, bit [47]

CEC, bits [46:32]

IMPLEMENTATION DEFINED, bits [31:0]

When ERRFR[FirstRecordOfNode(n)].CEC == 0b010, ERRFR[FirstRecordOfNode(n)].RP == 0 and error record n records countable errors:

IMPLEMENTATION DEFINED, bits [63:40]

OF, bit [39]

CEC, bits [38:32]

IMPLEMENTATION DEFINED, bits [31:0]

When ERRFR[FirstRecordOfNode(n)].CEC == 0b100, ERRFR[FirstRecordOfNode(n)].RP == 1 and error record n records countable errors:

OFO, bit [63]

CECO, bits [62:48]

OFR, bit [47]

CECR, bits [46:32]

IMPLEMENTATION DEFINED, bits [31:0]

When ERRFR[FirstRecordOfNode(n)].CEC == 0b010, ERRFR[FirstRecordOfNode(n)].RP == 1 and error record n records countable errors:

IMPLEMENTATION DEFINED, bits [63:48]

OFO, bit [47]

CECO, bits [46:40]

OFR, bit [39]

CECR, bits [38:32]

IMPLEMENTATION DEFINED, bits [31:0]

Accessing ERR<n>MISC0

ERR<n>MISC0 can be accessed through the memory-mapped interfaces: