Controls observability of Root and Realm events by System PMU <s>.
This register is present only when FEAT_RME is implemented and FEAT_SPMU is implemented. Otherwise, direct accesses to SPMROOTCR_EL3 are UNDEFINED.
SPMROOTCR_EL3 is a 64-bit register.
| 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 | |||||||||||||||||||||||||||||||
| RAO | RES0 | NAO | RES0 | RLO | RTO | ||||||||||||||||||||||||||
IMPLEMENTATION DEFINED observation controls. Additional IMPLEMENTATION DEFINED bits to control certain types of filter or events by System PMU <s>.
The reset behavior of this field is:
Reserved, RAO.
Indicates SPMROOTCR_EL3 is implemented by System PMU <s>.
Reserved, RES0.
Non-attributable Observation. Controls whether events or monitorable characteristics not attributable with any source can be monitored by System PMU <s>.
| NAO | Meaning |
|---|---|
| 0b0 |
Events not attributable with any event source are not counted by System PMU <s>. |
| 0b1 |
Counting non-attributable events by System PMU <s> is not prevented by this mechanism. |
When both SPMROOTCR_EL3 and SPMSCR_EL1 are implemented, non-attributable events are counted only if both SPMROOTCR_EL3.NAO is 1 and SPMSCR_EL1.{NAO, SO} is nonzero.
SPMROOTCR_EL3.NAO has the opposite reset polarity to SPMSCR_EL1.NAO.
The reset behavior of this field is:
Reserved, RES0.
Reserved, RES0.
Realm Observation. Controls whether events or monitorable characteristics attributable to a Realm event source can be monitored by System PMU <s>.
| RLO | Meaning |
|---|---|
| 0b0 |
Events attributable to a Realm event source are not counted by System PMU <s>. |
| 0b1 |
Counting events by System PMU <s> that are attributable to a Realm event source is not prevented by this mechanism. |
The reset behavior of this field is:
Root Observation. Controls whether events or monitorable characteristics attributable to a Root event source can be monitored by System PMU <s>.
| RTO | Meaning |
|---|---|
| 0b0 |
Events attributable to a Root event source are not counted by System PMU <s>. |
| 0b1 |
Counting events by System PMU <s> that are attributable to a Root event source is not prevented by this mechanism. |
The reset behavior of this field is:
To access SPMROOTCR_EL3 for System PMU <s>, set SPMSELR_EL0.SYSPMUSEL to s.
SPMROOTCR_EL3 reads-as-zero and ignores writes if any of the following are true:
Accesses to this register use the following encodings in the System register encoding space:
MRS <Xt>, SPMROOTCR_EL3
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b10 | 0b110 | 0b1001 | 0b1110 | 0b111 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then UNDEFINED; elsif PSTATE.EL == EL2 then UNDEFINED; elsif PSTATE.EL == EL3 then X[t, 64] = SPMROOTCR_EL3[UInt(SPMSELR_EL0.SYSPMUSEL)];
MSR SPMROOTCR_EL3, <Xt>
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b10 | 0b110 | 0b1001 | 0b1110 | 0b111 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then UNDEFINED; elsif PSTATE.EL == EL2 then UNDEFINED; elsif PSTATE.EL == EL3 then if IsFeatureImplemented(FEAT_FGWTE3) && FGWTE3_EL3.SPMROOTCR_EL3 == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else SPMROOTCR_EL3[UInt(SPMSELR_EL0.SYSPMUSEL)] = X[t, 64];