PMEVCNTR<n>_EL0, Performance Monitors Event Count Registers, n = 0 - 30

The PMEVCNTR<n>_EL0 characteristics are:

Purpose

Holds event counter n, which counts events, where n is 0 to 30.

Configuration

AArch64 System register PMEVCNTR<n>_EL0 bits [31:0] are architecturally mapped to AArch32 System register PMEVCNTR<n>[31:0] .

AArch64 System register PMEVCNTR<n>_EL0 bits [31:0] are architecturally mapped to External register PMEVCNTR<n>_EL0[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

PMEVCNTR<n>_EL0 is a 64-bit register.

Field descriptions

The PMEVCNTR<n>_EL0 bit assignments are:

When ARMv8.5-PMU is implemented:

6362616059585756555453525150494847464544434241403938373635343332
Event counter n
Event counter n
313029282726252423222120191817161514131211109876543210

Bits [63:0]

Event counter n. Value of event counter n, where n is the number of this register and is a number from 0 to 30.

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

Otherwise:

6362616059585756555453525150494847464544434241403938373635343332
RES0
Event counter n
313029282726252423222120191817161514131211109876543210

Bits [63:32]

Reserved, RES0.

Bits [31:0]

Event counter n. Value of event counter n, where n is the number of this register and is a number from 0 to 30.

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

Accessing the PMEVCNTR<n>_EL0

PMEVCNTR<n>_EL0 can also be accessed by using PMXEVCNTR_EL0 with PMSELR_EL0.SEL set to the value of <n>.

If <n> is greater than or equal to the number of accessible counters, reads and writes of PMEVCNTR<n>_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>, PMEVCNTR<n>_EL0

op0op1CRnCRmop2
0b110b0110b11100b10[n:4:3]0b[n:2:0]

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 PMEVCNTR_EL0[UInt(CRm<1:0>:op2<2:0>)]; 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 PMEVCNTR_EL0[UInt(CRm<1:0>:op2<2:0>)]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else return PMEVCNTR_EL0[UInt(CRm<1:0>:op2<2:0>)]; elsif PSTATE.EL == EL3 then return PMEVCNTR_EL0[UInt(CRm<1:0>:op2<2:0>)];

MSR PMEVCNTR<n>_EL0, <Xt>

op0op1CRnCRmop2
0b110b0110b11100b10[n:4:3]0b[n:2:0]

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 PMEVCNTR_EL0[UInt(CRm<1:0>:op2<2:0>)] = 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 PMEVCNTR_EL0[UInt(CRm<1:0>:op2<2:0>)] = X[t]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else PMEVCNTR_EL0[UInt(CRm<1:0>:op2<2:0>)] = X[t]; elsif PSTATE.EL == EL3 then PMEVCNTR_EL0[UInt(CRm<1:0>:op2<2:0>)] = X[t];




27/03/2019 21:59; e5e4db499bf9867a4b93324c4dbac985d3da9376

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