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PMEVTYPER<n>_EL0, Performance Monitors Event Type Registers, n = 0 - 30

The PMEVTYPER<n>_EL0 characteristics are:

Purpose

Configures event counter n, where n is 0 to 30.

Configuration

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

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

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

Field descriptions

The PMEVTYPER<n>_EL0 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0
PUNSKNSUNSHMMTSHTRES0evtCount[15:10]evtCount[9:0]
313029282726252423222120191817161514131211109876543210

Bits [63:32]

Reserved, RES0.

P, bit [31]

Privileged filtering bit. Controls counting in EL1. If EL3 is implemented, then counting in Non-secure EL1 is further controlled by the PMEVTYPER<n>_EL0.NSK bit. The possible values of this bit are:

PMeaning
0b0

Count events in EL1.

0b1

Do not count events in EL1.

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

U, bit [30]

User filtering bit. Controls counting in EL0. If EL3 is implemented, then counting in Non-secure EL0 is further controlled by the PMEVTYPER<n>_EL0.NSU bit. The possible values of this bit are:

UMeaning
0b0

Count events in EL0.

0b1

Do not count events in EL0.

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

NSK, bit [29]

Non-secure EL1 (kernel) modes filtering bit. Controls counting in Non-secure EL1. If EL3 is not implemented, this bit is RES0.

If the value of this bit is equal to the value of the PMEVTYPER<n>_EL0.P bit, events in Non-secure EL1 are counted.

Otherwise, events in Non-secure EL1 are not counted.

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

NSU, bit [28]

Non-secure EL0 (Unprivileged) filtering bit. Controls counting in Non-secure EL0. If EL3 is not implemented, this bit is RES0.

If the value of this bit is equal to the value of the PMEVTYPER<n>_EL0.U bit, events in Non-secure EL0 are counted.

Otherwise, events in Non-secure EL0 are not counted.

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

NSH, bit [27]

EL2 (Hypervisor) filtering bit. Controls counting in EL2. If EL2 is not implemented, this bit is RES0. If Secure EL2 is implemented, counting in Secure EL2 is further controlled by the PMEVTYPER<n>_EL0.SH bit.

NSHMeaning
0b0

Do not count events in EL2.

0b1

Count events in EL2.

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

M, bit [26]

Secure EL3 filtering bit. If EL3 is not implemented, this bit is RES0.

If the value of this bit is equal to the value of the PMEVTYPER<n>_EL0.P bit, cycles in Secure EL3 are counted.

Otherwise, cycles in Secure EL3 are not counted.

Most applications can ignore this field and set its value to 0b0.

Note

This field is not visible in the AArch32 PMEVTYPER<n> System register.

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

MT, bit [25]

Multithreading. When the implementation is multi-threaded, the valid values for this bit are:

MTMeaning
0b0

Count events only on controlling PE.

0b1

Count events from any PE with the same affinity at level 1 and above as this PE.

When the implementation is not multi-threaded, this bit is RES0.

Note
  • When the lowest level of affinity consists of logical PEs that are implemented using a multi-threading type approach, an implementation is described as multi-threaded. That is, the performance of PEs at the lowest affinity level is highly interdependent. On such an implementation, when read at the highest implemented Exception level, the value of the MPIDR_EL1.MT bit is 0b1.
  • Events from a different thread of a multithreaded implementation are not Attributable to the thread counting the event.

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

SH, bit [24]

When ARMv8.4-SecEL2 is implemented:

Secure EL2 filtering.

If the value of this bit is not equal to the value of the PMEVTYPER<n>_EL0.NSH bit, events in Secure EL2 are counted.

Otherwise, events in Secure EL2 are not counted.

If Secure EL2 is not implemented or is disabled, this field is RES0.

Note

This field is not visible in the AArch32 PMEVTYPER<n> System register.

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


Otherwise:

Reserved, RES0.

T, bit [23]

When TME is implemented:

Transactional state filtering bit. Controls counting in Transactional state. The possible values of this bit are:

TMeaning
0b0

Count events in both Transactional and Non-transactional states.

0b1

Count events only in Transactional state.

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


Otherwise:

Reserved, RES0.

Bits [22:16]

Reserved, RES0.

evtCount[15:10], bits [15:10]

When ARMv8.1-PMU is implemented:

Extension to evtCount[9:0]. See evtCount[9:0] for more details.

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


Otherwise:

Reserved, RES0.

evtCount[9:0], bits [9:0]

Event to count. The event number of the event that is counted by event counter PMEVCNTR<n>_EL0.

If evtCount is programmed to an event that is reserved or not supported by the PE, the behavior depends on the value written:

  • For the range 0x000 to 0x03F, no events are counted, and the value returned by a direct or external read of the evtCount field is the value written to the field.
  • If 16-bit evtCount is implemented, for the range 0x4000 to 0x403F, no events are counted, and the value returned by a direct or external read of the evtCount field is the value written to the field.
  • For IMPLEMENTATION DEFINED events, it is UNPREDICTABLE what event, if any, is counted, and the value returned by a direct or external read of the evtCount field is UNKNOWN.
Note

UNPREDICTABLE means the event must not expose privileged information.

Arm recommends that the behavior across a family of implementations is defined such that if a given implementation does not include an event from a set of common IMPLEMENTATION DEFINED events, then no event is counted and the value read back on evtCount is the value written.

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

Accessing the PMEVTYPER<n>_EL0

PMEVTYPER<n>_EL0 can also be accessed by using PMXEVTYPER_EL0 with PMSELR_EL0.SEL set to n.

If <n> is greater than or equal to the number of accessible counters, reads and writes of PMEVTYPER<n>_EL0 are CONSTRAINED UNPREDICTABLE, and the following behaviors are permitted:

  • Accesses to the register are UNDEFINED.
  • Accesses to the register behave as RAZ/WI.
  • Accesses to the register execute as a NOP.
  • If EL2 is implemented and enabled in the current Security state, and <n> is less than the number of implemented counters, accesses from EL1 or permitted accesses from EL0 are trapped to EL2.
Note

In EL0, an access is permitted if it is enabled by PMUSERENR_EL0.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>, PMEVTYPER<n>_EL0

op0op1CRnCRmop2
0b110b0110b11100b11[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
        return PMEVTYPER_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 PMEVTYPER_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 PMEVTYPER_EL0[UInt(CRm<1:0>:op2<2:0>)];
elsif PSTATE.EL == EL3 then
    return PMEVTYPER_EL0[UInt(CRm<1:0>:op2<2:0>)];

MSR PMEVTYPER<n>_EL0, <Xt>

op0op1CRnCRmop2
0b110b0110b11100b11[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
        PMEVTYPER_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
        PMEVTYPER_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
        PMEVTYPER_EL0[UInt(CRm<1:0>:op2<2:0>)] = X[t];
elsif PSTATE.EL == EL3 then
    PMEVTYPER_EL0[UInt(CRm<1:0>:op2<2:0>)] = X[t];


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