PMCR_EL0 | Jon's Arm Reference

Provides details of the Performance Monitors implementation, including the number of counters implemented, and configures and controls the counters.

Configuration

External register PMCR_EL0 bits [63:32] are architecturally mapped to AArch64 System register PMCR_EL0[63:32] when FEAT_PMUv3_EXT64 is implemented.

External register PMCR_EL0 bits [31:0] are architecturally mapped to AArch64 System register PMCR_EL0[31:0].

External register PMCR_EL0 bits [10:0] are architecturally mapped to AArch32 System register PMCR[10:0].

This register is present only when FEAT_PMUv3_EXT is implemented. Otherwise, direct accesses to PMCR_EL0 are RES0.

This register is only partially mapped to the internal PMCR System register. An external agent must use other means to discover the information held in PMCR[31:11], such as accessing PMU.PMCFGR and the ID registers.

Attributes

Field descriptions

When FEAT_PMUv3_EXT64 is implemented:

Bits [63:33]

FZS, bit [32]

When FEAT_SPEv1p2 is implemented and FEAT_SPE_DPFZS is implemented:

Freeze-on-SPE event. Stop counters when PMBLIMITR_EL1.{PMFZ,E} == {1,1} and PMBSR_EL1.S == 1.

FZS	Meaning
0b0	Do not freeze on a Statistical Profiling Buffer Management event.
0b1	Affected counters do not count following a Statistical Profiling Buffer Management event.

The counters affected by this field are:

If EL2 is implemented, event counters PMU.PMEVCNTR<n>_EL0 for values of n less than PMN, where PMN is:
- If EL2 is implemented and using AArch32, HDCR.HPMN.
- If EL2 is implemented and using AArch64, MDCR_EL2.HPMN.
If EL2 is not implemented, all event counters PMU.PMEVCNTR<n>_EL0, where n is less than PMCR_EL0.N.
If FEAT_PMUv3_ICNTR is implemented, the instruction counter PMU.PMICNTR_EL0.
If PMCR_EL0.DP is 1, the cycle counter PMU.PMCCNTR_EL0.

Note

The same counters are affected even when EL2 is disabled in the current Security state.

Other event counters are not affected by this field.

When PMCR_EL0.DP is 0, PMU.PMCCNTR_EL0 is not affected by this field.

The reset behavior of this field is:

On a Warm reset:
- When AArch32 is supported, this field resets to 0.
- Otherwise, this field resets to an architecturally UNKNOWN value.

When FEAT_SPEv1p2 is implemented:

Freeze-on-SPE event. Stop counters when PMBLIMITR_EL1.{PMFZ,E} == {1,1} and PMBSR_EL1.S == 1.

FZS	Meaning
0b0	Do not freeze on Statistical Profiling Buffer Management event.
0b1	Event counter PMU.PMEVCNTR<n>_EL0 does not count following a Statistical Profiling Buffer Management event if n is in the range of affected event counters.

The counters affected by this field are:

If EL2 is implemented, event counters PMU.PMEVCNTR<n>_EL0 for values of n less than PMN, where PMN is:
- If EL2 is implemented and using AArch32,HDCR.HPMN.
- If EL2 is implemented and using AArch64, MDCR_EL2.HPMN.
If EL2 is not implemented, all event counters PMU.PMEVCNTR<n>_EL0, where n is less than PMCR_EL0.N.
If FEAT_PMUv3_ICNTR is implemented, the instruction counter PMU.PMICNTR_EL0.

Note

The same counters are affected even when EL2 is disabled in the current Security state.

Other event counters and PMU.PMCCNTR_EL0 are not affected by this field.

The reset behavior of this field is:

On a Warm reset:
- When AArch32 is supported, this field resets to 0.
- When the implementation only supports execution in AArch64 state, this field resets to an architecturally UNKNOWN value.

Otherwise:

Bits [31:11]

Reserved, RAZ/WI.

Hardware must implement this field as RAZ/WI. Software must not rely on the register reading as zero, and must use a read-modify-write sequence to write to the register.

Bit [10]

FZO, bit [9]

When FEAT_PMUv3p7 is implemented:

Freeze-on-overflow. Stop event counters on overflow.

In the description of this field:

If EL2 is implemented and is using AArch32, then PMN is HDCR.HPMN.
If EL2 is implemented and is using AArch64, then PMN is MDCR_EL2.HPMN.
If EL2 is not implemented, then PMN is PMCR_EL0.N.

FZO	Meaning
0b0	Do not freeze on overflow.
0b1	Affected counters do not count when any of the following applies: For any value of m less than PMN, PMU.PMOVSCLR_EL0[m] is 1, and either FEAT_SEBEP is not implemented or PMEVTYPER<m>_EL0.SYNC is 0. FEAT_PMUv3_ICNTR is implemented, PMU.PMOVSCLR_EL0.F0 is 1, and either FEAT_SEBEP is not implemented or PMU.PMICFILTR_EL0.SYNC is 0.

FZO

Meaning

0b0

Do not freeze on overflow.

0b1

Affected counters do not count when any of the following applies:

For any value of m less than PMN, PMU.PMOVSCLR_EL0[m] is 1, and either FEAT_SEBEP is not implemented or PMEVTYPER<m>_EL0.SYNC is 0.
FEAT_PMUv3_ICNTR is implemented, PMU.PMOVSCLR_EL0.F0 is 1, and either FEAT_SEBEP is not implemented or PMU.PMICFILTR_EL0.SYNC is 0.

The counters affected by this field are:

If EL2 is implemented, event counters PMU.PMEVCNTR<n>_EL0 for values of n less than PMN. This applies even when EL2 is disabled in the current Security state.
If EL2 is not implemented, all event counters PMU.PMEVCNTR<n>_EL0.
If FEAT_PMUv3_ICNTR is implemented, the instruction counter PMU.PMICNTR_EL0.
If PMCR_EL0.DP is 1, the cycle counter PMU.PMCCNTR_EL0.

Other event counters are not affected by this field.

When PMCR_EL0.DP is 0, PMU.PMCCNTR_EL0 is not affected by this field.

The reset behavior of this field is:

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

Otherwise:

Bit [8]

LP, bit [7]

When FEAT_PMUv3p5 is implemented:

Long event counter enable. Determines when unsigned overflow is recorded by an event counter overflow bit.

In the description of this field:

If EL2 is implemented and is using AArch32, then PMN is HDCR.HPMN.
If EL2 is implemented and is using AArch64, then PMN is MDCR_EL2.HPMN.
If EL2 is not implemented, then PMN is PMCR_EL0.N.

LP	Meaning
0b0	Event counter overflow on increment that causes unsigned overflow of PMU.PMEVCNTR<n>_EL0[31:0].
0b1	Event counter overflow on increment that causes unsigned overflow of PMU.PMEVCNTR<n>_EL0[63:0].

When FEAT_EBEP is implemented and the PMU exception is enabled, the Effective value of this field is 1.

The counters affected by this field are:

If EL2 is implemented, event counters PMU.PMEVCNTR<n>_EL0 for values of n less than PMN. This applies even when EL2 is disabled in the current Security state.
If EL2 is not implemented, all event counters PMU.PMEVCNTR<n>_EL0.

Other event counters, PMU.PMCCNTR_EL0, and, if FEAT_PMUv3_ICNTR is implemented, PMU.PMICNTR_EL0 are not affected by this field.

The reset behavior of this field is:

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

Otherwise:

LC, bit [6]

When AArch32 is supported:

Long cycle counter enable. Determines when unsigned overflow is recorded by the cycle counter overflow bit.

LC	Meaning
0b0	Cycle counter overflow on increment that causes unsigned overflow of PMU.PMCCNTR_EL0[31:0].
0b1	Cycle counter overflow on increment that causes unsigned overflow of PMU.PMCCNTR_EL0[63:0].

When FEAT_EBEP is implemented and the PMU exception is enabled, the Effective value of this field is 1.

Arm deprecates use of PMU.PMCR_EL0.LC = 0.

The reset behavior of this field is:

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

Otherwise:

DP, bit [5]

When EL3 is implemented or (FEAT_PMUv3p1 is implemented and EL2 is implemented):

Disable cycle counter when event counting is prohibited.

DP	Meaning
0b0	Cycle counting by PMU.PMCCNTR_EL0 is not affected by this mechanism.
0b1	Cycle counting by PMU.PMCCNTR_EL0 is disabled in prohibited regions and when event counting is frozen: If FEAT_PMUv3p1 is implemented, EL2 is implemented, and MDCR_EL2.HPMD is 1, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL2. If FEAT_PMUv3p7 is implemented, EL3 is implemented and using AArch64, and MDCR_EL3.MPMX is 1, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL3. If FEAT_PMUv3p7 is implemented and event counting is frozen by PMCR_EL0.FZO, then cycle counting by PMU.PMCCNTR_EL0 is disabled. If FEAT_SPE_DPFZS is implemented and event counting is frozen by PMCR_EL0.FZS, then cycle counting by PMCCNTR_EL0 is disabled. If EL3 is implemented, MDCR_EL3.SPME is 0, and either FEAT_PMUv3p7 is not implemented or MDCR_EL3.MPMX is 0, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL3 and in Secure state.

Meaning

0b0

Cycle counting by PMU.PMCCNTR_EL0 is not affected by this mechanism.

0b1

Cycle counting by PMU.PMCCNTR_EL0 is disabled in prohibited regions and when event counting is frozen:

If FEAT_PMUv3p1 is implemented, EL2 is implemented, and MDCR_EL2.HPMD is 1, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL2.
If FEAT_PMUv3p7 is implemented, EL3 is implemented and using AArch64, and MDCR_EL3.MPMX is 1, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL3.
If FEAT_PMUv3p7 is implemented and event counting is frozen by PMCR_EL0.FZO, then cycle counting by PMU.PMCCNTR_EL0 is disabled.
If FEAT_SPE_DPFZS is implemented and event counting is frozen by PMCR_EL0.FZS, then cycle counting by PMCCNTR_EL0 is disabled.
If EL3 is implemented, MDCR_EL3.SPME is 0, and either FEAT_PMUv3p7 is not implemented or MDCR_EL3.MPMX is 0, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL3 and in Secure state.

The conditions when this field disables the cycle counter are the same as when event counting by an event counter PMU.PMEVCNTR<n>_EL0 is prohibited or frozen, when either EL2 is not implemented or n is less than MDCR_EL2.HPMN.

If FEAT_PMUv3p7 and FEAT_SPEv1p2 are implemented, meaning PMCR_EL0.FZS is implemented, and FEAT_SPE_DPFZS is not implemented, then cycle counting by PMCCNTR_EL0 is not affected by PMCR_EL0.FZS.

For more information, see 'Prohibiting event and cycle counting'.

The reset behavior of this field is:

On a Warm reset:
- When the implementation only supports execution in AArch32 state, this field resets to 0.
- Otherwise, this field resets to an architecturally UNKNOWN value.

Otherwise:

X, bit [4]

When the implementation includes a PMU event export bus:

Enable export of events in an IMPLEMENTATION DEFINED PMU event export bus.

X	Meaning
0b0	Do not export events.
0b1	Export events where not prohibited.

This field enables the exporting of events over an IMPLEMENTATION DEFINED PMU event export bus to another device, for example to an OPTIONAL trace unit.

No events are exported when counting is prohibited.

This field does not affect the generation of Performance Monitors overflow interrupt requests or signaling to a cross-trigger interface (CTI) that can be implemented as signals exported from the PE.

When this register has an architecturally-defined reset value, if this field is implemented as an RW field it resets to:

A value that is architecturally UNKNOWN if the reset is into an Exception level that is using AArch64.
0 if the reset is into an Exception level that is using AArch32.

Otherwise:

D, bit [3]

When AArch32 is supported:

Clock divider.

D	Meaning
0b0	When enabled, PMU.PMCCNTR_EL0 counts every clock cycle.
0b1	When enabled, PMU.PMCCNTR_EL0 counts once every 64 clock cycles.

If PMCR_EL0.LC == 1, this bit is ignored and the cycle counter counts every clock cycle.

Arm deprecates use of PMCR_EL0.D = 1.

When this register has an architecturally-defined reset value, if this field is implemented as an RW field it resets to:

A value that is architecturally UNKNOWN if the reset is into an Exception level that is using AArch64.
0 if the reset is into an Exception level that is using AArch32.

Otherwise:

C, bit [2]

Cycle counter reset. The effects of writing to this bit are:

C	Meaning
0b0	No action.
0b1	Reset PMU.PMCCNTR_EL0 to zero.

Note

Resetting PMU.PMCCNTR_EL0 does not change the cycle counter overflow bit. If FEAT_PMUv3p5 is implemented, the value of PMCR_EL0.LC is ignored, and bits [63:0] of the cycle counter are reset.

Access to this field is WO/RAZ.

P, bit [1]

Event counter reset. The effects of writing to this bit are:

P	Meaning
0b0	No action.
0b1	Reset all event counters, not including PMU.PMCCNTR_EL0, to zero.

Note

Resetting the event counters does not change the event counter overflow bits. If FEAT_PMUv3p5 is implemented, the value of MDCR_EL2.HLP, or PMCR_EL0.LP is ignored and bits [63:0] of all affected event counters are reset.

Access to this field is WO/RAZ.

E, bit [0]

Enable.

In the description of this field:

If EL2 is implemented and is using AArch32, then PMN is HDCR.HPMN.
If EL2 is implemented and is using AArch64, then PMN is MDCR_EL2.HPMN.
If EL2 is not implemented, then PMN is PMCR_EL0.N.

E	Meaning
0b0	Affected counters are disabled and do not count.
0b1	Affected counters are enabled by PMCNTENSET_EL0.

The counters affected by this field are:

If EL2 is implemented, event counters PMU.PMEVCNTR<n>_EL0 for values of n less than PMN. This applies even when EL2 is disabled in the current Security state.
If EL2 is not implemented, all event counters PMU.PMEVCNTR<n>_EL0.
If FEAT_PMUv3_ICNTR is implemented, the instruction counter PMU.PMICNTR_EL0.
The cycle counter PMU.PMCCNTR_EL0.

Other event counters are not affected by this field.

The reset behavior of this field is:

On a Warm reset, this field resets to 0.

Otherwise:

Bits [31:11]

Reserved, RAZ/WI.

Hardware must implement this field as RAZ/WI. Software must not rely on the register reading as zero, and must use a read-modify-write sequence to write to the register.

Bit [10]

FZO, bit [9]

When FEAT_PMUv3p7 is implemented:

Freeze-on-overflow. Stop event counters on overflow.

In the description of this field:

If EL2 is implemented and is using AArch32, then PMN is HDCR.HPMN.
If EL2 is implemented and is using AArch64, then PMN is MDCR_EL2.HPMN.
If EL2 is not implemented, then PMN is PMCR_EL0.N.

FZO	Meaning
0b0	Do not freeze on overflow.
0b1	Affected counters do not count when any of the following applies: For any value of m less than PMN, PMU.PMOVSCLR_EL0[m] is 1, and either FEAT_SEBEP is not implemented or PMEVTYPER<m>_EL0.SYNC is 0. FEAT_PMUv3_ICNTR is implemented, PMU.PMOVSCLR_EL0.F0 is 1, and either FEAT_SEBEP is not implemented or PMU.PMICFILTR_EL0.SYNC is 0.

FZO

Meaning

0b0

Do not freeze on overflow.

0b1

Affected counters do not count when any of the following applies:

For any value of m less than PMN, PMU.PMOVSCLR_EL0[m] is 1, and either FEAT_SEBEP is not implemented or PMEVTYPER<m>_EL0.SYNC is 0.
FEAT_PMUv3_ICNTR is implemented, PMU.PMOVSCLR_EL0.F0 is 1, and either FEAT_SEBEP is not implemented or PMU.PMICFILTR_EL0.SYNC is 0.

The counters affected by this field are:

If EL2 is implemented, event counters PMU.PMEVCNTR<n>_EL0 for values of n less than PMN. This applies even when EL2 is disabled in the current Security state.
If EL2 is not implemented, all event counters PMU.PMEVCNTR<n>_EL0.
If FEAT_PMUv3_ICNTR is implemented, the instruction counter PMU.PMICNTR_EL0.
If PMCR_EL0.DP is 1, the cycle counter PMU.PMCCNTR_EL0.

Other event counters are not affected by this field.

When PMCR_EL0.DP is 0, PMU.PMCCNTR_EL0 is not affected by this field.

The reset behavior of this field is:

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

Otherwise:

Bit [8]

LP, bit [7]

When FEAT_PMUv3p5 is implemented:

Long event counter enable. Determines when unsigned overflow is recorded by an event counter overflow bit.

In the description of this field:

If EL2 is implemented and is using AArch32, then PMN is HDCR.HPMN.
If EL2 is implemented and is using AArch64, then PMN is MDCR_EL2.HPMN.
If EL2 is not implemented, then PMN is PMCR_EL0.N.

LP	Meaning
0b0	Event counter overflow on increment that causes unsigned overflow of PMU.PMEVCNTR<n>_EL0[31:0].
0b1	Event counter overflow on increment that causes unsigned overflow of PMU.PMEVCNTR<n>_EL0[63:0].

When FEAT_EBEP is implemented and the PMU exception is enabled, the Effective value of this field is 1.

The counters affected by this field are:

If EL2 is implemented, event counters PMU.PMEVCNTR<n>_EL0 for values of n less than PMN. This applies even when EL2 is disabled in the current Security state.
If EL2 is not implemented, all event counters PMU.PMEVCNTR<n>_EL0.

Other event counters, PMU.PMCCNTR_EL0, and, if FEAT_PMUv3_ICNTR is implemented, PMU.PMICNTR_EL0 are not affected by this field.

The reset behavior of this field is:

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

Otherwise:

LC, bit [6]

When AArch32 is supported:

Long cycle counter enable. Determines when unsigned overflow is recorded by the cycle counter overflow bit.

LC	Meaning
0b0	Cycle counter overflow on increment that causes unsigned overflow of PMU.PMCCNTR_EL0[31:0].
0b1	Cycle counter overflow on increment that causes unsigned overflow of PMU.PMCCNTR_EL0[63:0].

When FEAT_EBEP is implemented and the PMU exception is enabled, the Effective value of this field is 1.

Arm deprecates use of PMU.PMCR_EL0.LC = 0.

The reset behavior of this field is:

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

Otherwise:

DP, bit [5]

When EL3 is implemented or (FEAT_PMUv3p1 is implemented and EL2 is implemented):

Disable cycle counter when event counting is prohibited.

DP	Meaning
0b0	Cycle counting by PMU.PMCCNTR_EL0 is not affected by this mechanism.
0b1	Cycle counting by PMU.PMCCNTR_EL0 is disabled in prohibited regions and when event counting is frozen: If FEAT_PMUv3p1 is implemented, EL2 is implemented, and MDCR_EL2.HPMD is 1, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL2. If FEAT_PMUv3p7 is implemented, EL3 is implemented and using AArch64, and MDCR_EL3.MPMX is 1, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL3. If FEAT_PMUv3p7 is implemented and event counting is frozen by PMCR_EL0.FZO, then cycle counting by PMU.PMCCNTR_EL0 is disabled. If FEAT_SPE_DPFZS is implemented and event counting is frozen by PMCR_EL0.FZS, then cycle counting by PMCCNTR_EL0 is disabled. If EL3 is implemented, MDCR_EL3.SPME is 0, and either FEAT_PMUv3p7 is not implemented or MDCR_EL3.MPMX is 0, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL3 and in Secure state.

Meaning

0b0

Cycle counting by PMU.PMCCNTR_EL0 is not affected by this mechanism.

0b1

Cycle counting by PMU.PMCCNTR_EL0 is disabled in prohibited regions and when event counting is frozen:

If FEAT_PMUv3p1 is implemented, EL2 is implemented, and MDCR_EL2.HPMD is 1, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL2.
If FEAT_PMUv3p7 is implemented, EL3 is implemented and using AArch64, and MDCR_EL3.MPMX is 1, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL3.
If FEAT_PMUv3p7 is implemented and event counting is frozen by PMCR_EL0.FZO, then cycle counting by PMU.PMCCNTR_EL0 is disabled.
If FEAT_SPE_DPFZS is implemented and event counting is frozen by PMCR_EL0.FZS, then cycle counting by PMCCNTR_EL0 is disabled.
If EL3 is implemented, MDCR_EL3.SPME is 0, and either FEAT_PMUv3p7 is not implemented or MDCR_EL3.MPMX is 0, then cycle counting by PMU.PMCCNTR_EL0 is disabled at EL3 and in Secure state.

If FEAT_PMUv3p7 and FEAT_SPEv1p2 are implemented, meaning PMCR_EL0.FZS is implemented, and FEAT_SPE_DPFZS is not implemented, then cycle counting by PMCCNTR_EL0 is not affected by PMCR_EL0.FZS.

For more information, see 'Prohibiting event and cycle counting'.

The reset behavior of this field is:

On a Warm reset:
- When the implementation only supports execution in AArch32 state, this field resets to 0.
- Otherwise, this field resets to an architecturally UNKNOWN value.

Otherwise:

X, bit [4]

When the implementation includes a PMU event export bus:

Enable export of events in an IMPLEMENTATION DEFINED PMU event export bus.

X	Meaning
0b0	Do not export events.
0b1	Export events where not prohibited.

This field enables the exporting of events over an IMPLEMENTATION DEFINED PMU event export bus to another device, for example to an OPTIONAL trace unit.

No events are exported when counting is prohibited.

This field does not affect the generation of Performance Monitors overflow interrupt requests or signaling to a cross-trigger interface (CTI) that can be implemented as signals exported from the PE.

When this register has an architecturally-defined reset value, if this field is implemented as an RW field it resets to:

A value that is architecturally UNKNOWN if the reset is into an Exception level that is using AArch64.
0 if the reset is into an Exception level that is using AArch32.

Otherwise:

D, bit [3]

When AArch32 is supported:

Clock divider.

D	Meaning
0b0	When enabled, PMU.PMCCNTR_EL0 counts every clock cycle.
0b1	When enabled, PMU.PMCCNTR_EL0 counts once every 64 clock cycles.

If PMCR_EL0.LC == 1, this bit is ignored and the cycle counter counts every clock cycle.

Arm deprecates use of PMCR_EL0.D = 1.

When this register has an architecturally-defined reset value, if this field is implemented as an RW field it resets to:

A value that is architecturally UNKNOWN if the reset is into an Exception level that is using AArch64.
0 if the reset is into an Exception level that is using AArch32.

Otherwise:

C, bit [2]

Cycle counter reset. The effects of writing to this bit are:

C	Meaning
0b0	No action.
0b1	Reset PMU.PMCCNTR_EL0 to zero.

Note

Resetting PMU.PMCCNTR_EL0 does not change the cycle counter overflow bit. If FEAT_PMUv3p5 is implemented, the value of PMCR_EL0.LC is ignored, and bits [63:0] of the cycle counter are reset.

Access to this field is WO/RAZ.

P, bit [1]

Event counter reset. The effects of writing to this bit are:

P	Meaning
0b0	No action.
0b1	Reset all event counters, not including PMU.PMCCNTR_EL0, to zero.

Note

Access to this field is WO/RAZ.

E, bit [0]

Enable.

In the description of this field:

If EL2 is implemented and is using AArch32, then PMN is HDCR.HPMN.
If EL2 is implemented and is using AArch64, then PMN is MDCR_EL2.HPMN.
If EL2 is not implemented, then PMN is PMCR_EL0.N.

E	Meaning
0b0	Affected counters are disabled and do not count.
0b1	Affected counters are enabled by PMCNTENSET_EL0.

The counters affected by this field are:

If EL2 is implemented, event counters PMU.PMEVCNTR<n>_EL0 for values of n less than PMN. This applies even when EL2 is disabled in the current Security state.
If EL2 is not implemented, all event counters PMU.PMEVCNTR<n>_EL0.
If FEAT_PMUv3_ICNTR is implemented, the instruction counter PMU.PMICNTR_EL0.
The cycle counter PMU.PMCCNTR_EL0.

Other event counters are not affected by this field.

The reset behavior of this field is:

On a Warm reset, this field resets to 0.

Accessing PMCR_EL0

Note

SoftwareLockStatus() depends on the type of access attempted and AllowExternalPMUAccess() has a new definition from Armv8.4. Refer to the Pseudocode definitions for more information.

Accesses to this register use the following encodings:

When FEAT_PMUv3_EXT32 is implemented

Accessible at offset 0xE04 from PMU

When DoubleLockStatus(), or !IsCorePowered(), or OSLockStatus() or !AllowExternalPMUAccess(), accesses to this register generate an error response.
When SoftwareLockStatus(), accesses to this register are RO.
Otherwise, accesses to this register are RW.

When FEAT_PMUv3_EXT64 is implemented

Accessible at offset 0xE10 from PMU

When DoubleLockStatus(), or !IsCorePowered(), or OSLockStatus() or !AllowExternalPMUAccess(), accesses to this register generate an error response.
Otherwise, accesses to this register are RW.

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
RES0																															FZS
RAZ/WI																					RES0	FZO	RES0	LP	LC	DP	X	D	C	P	E

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
RAZ/WI																					RES0	FZO	RES0	LP	LC	DP	X	D	C	P	E

PMCR_EL0: Performance Monitors Control Register

Purpose

Configuration

Attributes

Field descriptions

When FEAT_PMUv3_EXT64 is implemented:

Bits [63:33]

FZS, bit [32]When FEAT_SPEv1p2 is implemented and FEAT_SPE_DPFZS is implemented:

When FEAT_SPEv1p2 is implemented:

Otherwise:

Bits [31:11]

Bit [10]

FZO, bit [9]When FEAT_PMUv3p7 is implemented:

Otherwise:

Bit [8]

LP, bit [7]When FEAT_PMUv3p5 is implemented:

Otherwise:

LC, bit [6]When AArch32 is supported:

Otherwise:

DP, bit [5]When EL3 is implemented or (FEAT_PMUv3p1 is implemented and EL2 is implemented):

Otherwise:

X, bit [4]When the implementation includes a PMU event export bus:

Otherwise:

D, bit [3]When AArch32 is supported:

Otherwise:

C, bit [2]

P, bit [1]

E, bit [0]

Otherwise:

Bits [31:11]

Bit [10]

FZO, bit [9]When FEAT_PMUv3p7 is implemented:

Otherwise:

Bit [8]

LP, bit [7]When FEAT_PMUv3p5 is implemented:

Otherwise:

LC, bit [6]When AArch32 is supported:

Otherwise:

DP, bit [5]When EL3 is implemented or (FEAT_PMUv3p1 is implemented and EL2 is implemented):

Otherwise:

X, bit [4]When the implementation includes a PMU event export bus:

Otherwise:

D, bit [3]When AArch32 is supported:

Otherwise:

C, bit [2]

P, bit [1]

E, bit [0]

Accessing PMCR_EL0

FZS, bit [32]

When FEAT_SPEv1p2 is implemented and FEAT_SPE_DPFZS is implemented:

FZO, bit [9]

When FEAT_PMUv3p7 is implemented:

LP, bit [7]

When FEAT_PMUv3p5 is implemented:

LC, bit [6]

When AArch32 is supported:

DP, bit [5]

When EL3 is implemented or (FEAT_PMUv3p1 is implemented and EL2 is implemented):

X, bit [4]

When the implementation includes a PMU event export bus:

D, bit [3]

When AArch32 is supported:

FZO, bit [9]

When FEAT_PMUv3p7 is implemented:

LP, bit [7]

When FEAT_PMUv3p5 is implemented:

LC, bit [6]

When AArch32 is supported:

DP, bit [5]

When EL3 is implemented or (FEAT_PMUv3p1 is implemented and EL2 is implemented):

X, bit [4]

When the implementation includes a PMU event export bus:

D, bit [3]

When AArch32 is supported: