You copied the Doc URL to your clipboard.

PMCNTENSET, Performance Monitors Count Enable Set register

The PMCNTENSET characteristics are:

Purpose

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

PMCNTENSET is used in conjunction with the PMCNTENCLR register.

Configuration

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

AArch32 System register PMCNTENSET bits [31:0] are architecturally mapped to External register PMCNTENSET_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

PMCNTENSET is a 32-bit register.

Field descriptions

The PMCNTENSET bit assignments are:

313029282726252423222120191817161514131211109876543210
CP<n>, bit [n]

C, bit [31]

PMCCNTR 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.

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

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

Event counter enable bit for PMEVCNTR<n>.

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 if EL2 is using AArch64, or in HDCR.HPMN if EL2 is using AArch32. Otherwise, N is the value in PMCR.N.

P<n>Meaning
0b0

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

0b1

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

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

Accessing the PMCNTENSET

Accesses to this register use the following encodings:

MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coprocopc1CRnCRmopc2
0b11110b0000b10010b11000b001
if PSTATE.EL == EL0 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> != '11' && HSTR_EL2.T9 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif !ELUsingAArch32(EL1) && PMUSERENR_EL0.EN == '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) && MDCR_EL2.TPM == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    else
        return PMCNTENSET;
elsif PSTATE.EL == EL1 then
    if 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 HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    else
        return PMCNTENSET;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    else
        return PMCNTENSET;
elsif PSTATE.EL == EL3 then
    return PMCNTENSET;
              

MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coprocopc1CRnCRmopc2
0b11110b0000b10010b11000b001
if PSTATE.EL == EL0 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> != '11' && HSTR_EL2.T9 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T9 == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif !ELUsingAArch32(EL1) && PMUSERENR_EL0.EN == '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) && MDCR_EL2.TPM == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.TPM == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    else
        PMCNTENSET = R[t];
elsif PSTATE.EL == EL1 then
    if 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 HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    else
        PMCNTENSET = R[t];
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TPM == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x03);
    else
        PMCNTENSET = R[t];
elsif PSTATE.EL == EL3 then
    PMCNTENSET = R[t];
              


Was this page helpful? Yes No