PMCNTENSET_EL0, Performance Monitors Count Enable Set register

The PMCNTENSET_EL0 characteristics are:

Purpose

Enables the Cycle Count Register, PMCCNTR_EL0, and any implemented event counters PMEVCNTR<n>_EL0. Reading this register shows which counters are enabled.

Configuration

AArch64 System register PMCNTENSET_EL0 bits [31:0] are architecturally mapped to AArch32 System register PMCNTENSET[31:0].

AArch64 System register PMCNTENSET_EL0 bits [31:0] are architecturally mapped to External register PMU.PMCNTENSET_EL0[31:0].

AArch64 System register PMCNTENSET_EL0 bits [63:32] are architecturally mapped to External register PMU.PMCNTENSET_EL0[63:32] when FEAT_PMUv3_EXT64 is implemented.

This register is present only when FEAT_PMUv3 is implemented. Otherwise, direct accesses to PMCNTENSET_EL0 are UNDEFINED.

Attributes

PMCNTENSET_EL0 is a 64-bit register.

Field descriptions

6362616059585756555453525150494847464544434241403938373635343332
313029282726252423222120191817161514131211109876543210
RES0F0
CP30P29P28P27P26P25P24P23P22P21P20P19P18P17P16P15P14P13P12P11P10P9P8P7P6P5P4P3P2P1P0

Bits [63:33]

Reserved, RES0.

F<m>, bit [m+32], for m = 0
When FEAT_PMUv3_ICNTR is implemented:

Fixed-function counter <m> enable. On writes, allows software to enable fixed-function counter <m>. On reads, returns the fixed-function counter <m> enable status.

F<m>Meaning
0b0

Fixed-function counter <m> disabled.

0b1

Fixed-function counter <m> enabled.

PMCNTENSET_EL0.F0 holds the enable status for PMICNTR_EL0.

The reset behavior of this field is:

Access to this field is W1S.


Otherwise:

Reserved, RES0.

C, bit [31]

PMCCNTR_EL0 enable bit. Enables the cycle counter register. Possible values are:

CMeaning
0b0

When read, means the cycle counter is disabled. When written, has no effect.

0b1

When read, means the cycle counter is enabled. When written, enables the cycle counter.

The reset behavior of this field is:

P<n>, bit [n], for n = 30 to 0

Event counter enable bit for PMEVCNTR<n>_EL0.

If N is less than 31, then bits [30:N] are RAZ/WI. When EL2 is implemented and enabled in the current Security state, in EL1 and EL0, N is the value in MDCR_EL2.HPMN. Otherwise, N is the value in PMCR_EL0.N.

P<n>Meaning
0b0

When read, means that PMEVCNTR<n>_EL0 is disabled. When written, has no effect.

0b1

When read, means that PMEVCNTR<n>_EL0 event counter is enabled. When written, enables PMEVCNTR<n>_EL0.

The reset behavior of this field is:

Accessing PMCNTENSET_EL0

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, PMCNTENSET_EL0

op0op1CRnCRmop2
0b110b0110b10010b11000b001

if PSTATE.EL == EL0 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && MDCR_EL3.TPM == '1' then UNDEFINED; elsif PMUSERENR_EL0.EN == '0' then if EL2Enabled() && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); elsif EL2Enabled() && HCR_EL2.<E2H,TGE> != '11' && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.PMCNTEN == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.TPM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TPM == '1' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = PMCNTENSET_EL0; elsif PSTATE.EL == EL1 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && MDCR_EL3.TPM == '1' then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.PMCNTEN == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.TPM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TPM == '1' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = PMCNTENSET_EL0; elsif PSTATE.EL == EL2 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && MDCR_EL3.TPM == '1' then UNDEFINED; elsif HaveEL(EL3) && MDCR_EL3.TPM == '1' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = PMCNTENSET_EL0; elsif PSTATE.EL == EL3 then X[t, 64] = PMCNTENSET_EL0;

MSR PMCNTENSET_EL0, <Xt>

op0op1CRnCRmop2
0b110b0110b10010b11000b001

if PSTATE.EL == EL0 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && MDCR_EL3.TPM == '1' then UNDEFINED; elsif PMUSERENR_EL0.EN == '0' then if EL2Enabled() && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); elsif EL2Enabled() && HCR_EL2.<E2H,TGE> != '11' && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGWTR_EL2.PMCNTEN == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.TPM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TPM == '1' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else PMCNTENSET_EL0 = X[t, 64]; elsif PSTATE.EL == EL1 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && MDCR_EL3.TPM == '1' then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGWTR_EL2.PMCNTEN == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.TPM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TPM == '1' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else PMCNTENSET_EL0 = X[t, 64]; elsif PSTATE.EL == EL2 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && MDCR_EL3.TPM == '1' then UNDEFINED; elsif HaveEL(EL3) && MDCR_EL3.TPM == '1' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else PMCNTENSET_EL0 = X[t, 64]; elsif PSTATE.EL == EL3 then PMCNTENSET_EL0 = X[t, 64];


30/09/2022 15:58; 21c5a6dd0fdaf10a712e2f2d6fffbdbd66d4d96f

Copyright © 2010-2022 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.