Reads or writes the value of the selected event counter, PMEVCNTR<n>. PMSELR.SEL determines which event counter is selected.
AArch32 System register PMXEVCNTR bits [31:0] are architecturally mapped to AArch64 System register PMXEVCNTR_EL0[31:0].
This register is present only when AArch32 is supported and FEAT_PMUv3 is implemented. Otherwise, direct accesses to PMXEVCNTR are UNDEFINED.
PMXEVCNTR is a 32-bit register.
| 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 |
| PMEVCNTR<n> | |||||||||||||||||||||||||||||||
Value of the selected event counter, PMEVCNTR<n>, where n is the value stored in PMSELR.SEL.
If FEAT_PMUv3p5 is implemented, the event counter is 64 bits and only the least-significant part of the event counter is accessible in AArch32 state:
Reads from PMXEVCNTR return bits [31:0] of the counter.
Writes to PMXEVCNTR update bits [31:0] and leave bits [63:32] unchanged.
There is no means to access bits [63:32] directly from AArch32 state.
If the implementation does not support AArch64, bits [63:32] are not required to be implemented.
If FEAT_PMUv3p5 is not implemented, the event counter is 32 bits.
The reset behavior of this field is:
If FEAT_FGT is implemented and PMSELR.SEL is greater than or equal to the number of accessible event counters, then the behavior of permitted reads and writes of PMXEVCNTR is as follows:
If FEAT_FGT is not implemented and PMSELR.SEL is greater than or equal to the number of accessible event counters, then reads and writes of PMXEVCNTR are CONSTRAINED UNPREDICTABLE, and the following behaviors are permitted:
Permitted reads and writes of PMXEVCNTR are RAZ/WI if all of the following are true:
Permitted writes of PMXEVCNTR are ignored if all of the following are true:
In EL0, an access is permitted if it is enabled by PMUSERENR.{ER,EN} or PMUSERENR_EL0.{UEN,ER,EN}.
If EL2 is implemented and enabled in the current Security state, at EL0 and EL1:
Otherwise, the number of accessible event counters is the number of implemented event counters. For more information, see HDCR.HPMN and MDCR_EL2.HPMN.
Accesses to this register use the following encodings in the System register encoding space:
MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b1001 | 0b1101 | 0b010 |
if UInt(PMSELR.SEL) >= NUM_PMU_COUNTERS then if IsFeatureImplemented(FEAT_FGT) then UNDEFINED; else ConstrainUnpredictableProcedure(Unpredictable_PMUEVENTCOUNTER); elsif PSTATE.EL == EL0 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then UNDEFINED; elsif !ELUsingAArch32(EL1) && ((IsFeatureImplemented(FEAT_PMUv3p9) && PMUSERENR_EL0.<UEN,ER,EN> == '000') || (!IsFeatureImplemented(FEAT_PMUv3p9) && PMUSERENR_EL0.<ER,EN> == '00')) then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); else AArch64.AArch32SystemAccessTrap(EL1, 0x03); elsif ELUsingAArch32(EL1) && PMUSERENR.<ER,EN> == '00' then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TGE == '1' then AArch32.TakeHypTrapException(0x00); else UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && !ELIsInHost(EL0) && HSTR_EL2.T9 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && !ELUsingAArch32(EL1) && !ELIsInHost(EL0) && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.PMEVCNTRn_EL0 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && UInt(PMSELR.SEL) >= GetNumEventCountersAccessible() then if !IsFeatureImplemented(FEAT_FGT) then ConstrainUnpredictableProcedure(Unpredictable_PMUEVENTCOUNTER); elsif ELUsingAArch32(EL1) then AArch32.TakeHypTrapException(0x03); else AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x03); else R[t] = PMEVCNTR[UInt(PMSELR.SEL)]; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T9 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && UInt(PMSELR.SEL) >= GetNumEventCountersAccessible() then if !IsFeatureImplemented(FEAT_FGT) then ConstrainUnpredictableProcedure(Unpredictable_PMUEVENTCOUNTER); elsif ELUsingAArch32(EL2) then AArch32.TakeHypTrapException(0x03); else AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x03); else R[t] = PMEVCNTR[UInt(PMSELR.SEL)]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then UNDEFINED; elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x03); else R[t] = PMEVCNTR[UInt(PMSELR.SEL)]; elsif PSTATE.EL == EL3 then R[t] = PMEVCNTR[UInt(PMSELR.SEL)];
MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b1001 | 0b1101 | 0b010 |
if UInt(PMSELR.SEL) >= NUM_PMU_COUNTERS then if IsFeatureImplemented(FEAT_FGT) then UNDEFINED; else ConstrainUnpredictableProcedure(Unpredictable_PMUEVENTCOUNTER); elsif PSTATE.EL == EL0 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then UNDEFINED; elsif !ELUsingAArch32(EL1) && (PMUSERENR_EL0.EN == '0' && (!IsFeatureImplemented(FEAT_PMUv3p9) || PMUSERENR_EL0.UEN == '0')) then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); else AArch64.AArch32SystemAccessTrap(EL1, 0x03); elsif ELUsingAArch32(EL1) && PMUSERENR.EN == '0' then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TGE == '1' then AArch32.TakeHypTrapException(0x00); else UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && !ELIsInHost(EL0) && HSTR_EL2.T9 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && !ELUsingAArch32(EL1) && !ELIsInHost(EL0) && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGWTR_EL2.PMEVCNTRn_EL0 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && UInt(PMSELR.SEL) >= GetNumEventCountersAccessible() then if !IsFeatureImplemented(FEAT_FGT) then ConstrainUnpredictableProcedure(Unpredictable_PMUEVENTCOUNTER); elsif ELUsingAArch32(EL1) then AArch32.TakeHypTrapException(0x03); else AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x03); else PMEVCNTR[UInt(PMSELR.SEL)] = R[t]; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T9 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && UInt(PMSELR.SEL) >= GetNumEventCountersAccessible() then if !IsFeatureImplemented(FEAT_FGT) then ConstrainUnpredictableProcedure(Unpredictable_PMUEVENTCOUNTER); elsif ELUsingAArch32(EL2) then AArch32.TakeHypTrapException(0x03); else AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x03); else PMEVCNTR[UInt(PMSELR.SEL)] = R[t]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then UNDEFINED; elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x03); else PMEVCNTR[UInt(PMSELR.SEL)] = R[t]; elsif PSTATE.EL == EL3 then PMEVCNTR[UInt(PMSELR.SEL)] = R[t];