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PMXEVCNTR_EL0, Performance Monitors Selected Event Count Register

The PMXEVCNTR_EL0 characteristics are:

Purpose

Reads or writes the value of the selected event counter, PMEVCNTR<n>_EL0. PMSELR_EL0.SEL determines which event counter is selected.

Configuration

AArch64 System register PMXEVCNTR_EL0 bits [31:0] are architecturally mapped to AArch32 System register PMXEVCNTR[31:0] .

This register is in the Warm reset domain. On a Warm or Cold reset RW fields in this register reset to architecturally UNKNOWN values.

Attributes

PMXEVCNTR_EL0 is a 64-bit register.

Field descriptions

The PMXEVCNTR_EL0 bit assignments are:

When ARMv8.5-PMU is implemented:

6362616059585756555453525150494847464544434241403938373635343332
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 PMEVCNTR<n>
PMEVCNTR<n>
313029282726252423222120191817161514131211109876543210

PMEVCNTR<n>, bits [63:0]

Value of the selected event counter, PMEVCNTR<n>_EL0, where n is the value stored in PMSELR_EL0.SEL.

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

Otherwise:

6362616059585756555453525150494847464544434241403938373635343332
RES0
PMEVCNTR<n>
313029282726252423222120191817161514131211109876543210

Bits [63:32]

Reserved, RES0.

PMEVCNTR<n>, bits [31:0]

Value of the selected event counter, PMEVCNTR<n>_EL0, where n is the value stored in PMSELR_EL0.SEL.

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

Accessing the PMXEVCNTR_EL0

If PMSELR_EL0.SEL is greater than or equal to the number of accessible counters then reads and writes of PMXEVCNTR_EL0 are CONSTRAINED UNPREDICTABLE, and the following behaviors are permitted:

Note

In EL0, an access is permitted if it is enabled by PMUSERENR_EL0.{ER,EN}.

If EL2 is implemented and enabled in the current Security state, in EL1 and EL0, MDCR_EL2.HPMN identifies the number of accessible counters. Otherwise, the number of accessible counters is the number of implemented counters. See MDCR_EL2.HPMN for more details.

Accesses to this register use the following encodings:

MRS <Xt>, PMXEVCNTR_EL0

op0op1CRnCRmop2
op0CRnop1op2CRm
0b110b0110b10010b11010b010
0b110b10010b0110b0100b1101

if PSTATE.EL == EL0 then if !ELUsingAArch32(EL1) && PMUSERENR_EL0.<ER,EN> == '00' then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else return PMXEVCNTR_EL0; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else return PMXEVCNTR_EL0; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else return PMXEVCNTR_EL0; elsif PSTATE.EL == EL3 then return PMXEVCNTR_EL0;

MSR PMXEVCNTR_EL0, <Xt>

op0op1CRnCRmop2
op0CRnop1op2CRm
0b110b0110b10010b11010b010
0b110b10010b0110b0100b1101

if PSTATE.EL == EL0 then if !ELUsingAArch32(EL1) && PMUSERENR_EL0.EN == '0' then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else PMXEVCNTR_EL0 = X[t]; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.TPM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else PMXEVCNTR_EL0 = X[t]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else PMXEVCNTR_EL0 = X[t]; elsif PSTATE.EL == EL3 then PMXEVCNTR_EL0 = X[t];




2713/0312/20192018 2116:5942; e5e4db499bf9867a4b93324c4dbac985d3da93766379d01c197f1d40720d32d0f84c419c9187c009

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