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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 present only when FEAT_PMUv3 is implemented. Otherwise, direct accesses to PMEVTYPER<n>_EL0 are UNDEFINED.

Attributes

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

Field descriptions

The PMEVTYPER<n>_EL0 bit assignments are:

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
RES0
P	U	NSK	NSU	NSH	M	MT	SH	T	RES0							evtCount[15:10]						evtCount[9:0]
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0

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.

P	Meaning
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.

U	Meaning
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]

When EL3 is implemented:

Non-secure EL1 (kernel) modes filtering bit. Controls counting in Non-secure EL1.

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.

Otherwise:

Reserved, RES0.

NSU, bit [28]

When EL3 is implemented:

Non-secure EL0 (Unprivileged) filtering bit. Controls counting in Non-secure EL0.

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.

Otherwise:

Reserved, RES0.

NSH, bit [27]

When EL2 is implemented:

EL2 (Hypervisor) filtering bit. Controls counting in EL2.

If Secure EL2 is implemented, and EL3 is implemented, counting in Secure EL2 is further controlled by the PMEVTYPER<n>_EL0.SH bit.

NSH	Meaning
0b0	Do not count events in EL2.
0b1	Count events in EL2.

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

Otherwise:

Reserved, RES0.

M, bit [26]

When EL3 is implemented:

Secure EL3 filtering bit.

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

Otherwise, events 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.

Otherwise:

Reserved, RES0.

MT, bit [25]

When (FEAT_MTPMU is implemented and enabled) or an IMPLEMENTATION DEFINED multi-threaded PMU Extension is implemented:

Multithreading.

MT	Meaning
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.

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.
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.

Otherwise:

Reserved, RES0.

SH, bit [24]

When FEAT_SEL2 is implemented and EL3 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.

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 FEAT_TME is implemented:

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

T	Meaning
0b0	This bit has no effect on the filtering of events.
0b1	Do not count events 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 FEAT_PMUv3p1 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.

Software must program this field with an event that is supported by the PE being programmed.

The ranges of event numbers allocated to each type of event are shown in 'Allocation of the PMU event number space'.

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 0x0000 to 0x003F, 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 FEAT_FGT is implemented and <n> is greater than or equal to the number of accessible counters, then the behavior of permitted reads and writes of PMEVTYPER<n>_EL0 is as follows:

If <n> is an unimplemented event counter, the access is UNDEFINED.
Otherwise, the access is trapped to EL2.

If FEAT_FGT is not implemented and <n> is greater than or equal to the number of accessible counters, then 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 event 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 event counters. Otherwise, the number of accessible event counters is the number of implemented event counters. See MDCR_EL2.HPMN for more details.

Accesses to this register use the following encodings:

MRS <Xt>, PMEVTYPER<n>_EL0

op0	op1	CRn	CRm	op2
0b11	0b011	0b1110	0b11:n[4:3]	n[2:0]

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' && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.PMEVTYPERn_EL0 == '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
        return PMEVTYPER_EL0[UInt(CRm<1:0>:op2<2:0>)];
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() && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.PMEVTYPERn_EL0 == '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
        return PMEVTYPER_EL0[UInt(CRm<1:0>:op2<2:0>)];
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
        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>

op0	op1	CRn	CRm	op2
0b11	0b011	0b1110	0b11:n[4:3]	n[2:0]

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' && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGWTR_EL2.PMEVTYPERn_EL0 == '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
        PMEVTYPER_EL0[UInt(CRm<1:0>:op2<2:0>)] = X[t];
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() && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGWTR_EL2.PMEVTYPERn_EL0 == '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
        PMEVTYPER_EL0[UInt(CRm<1:0>:op2<2:0>)] = X[t];
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
        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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Arm® Architecture Registers: Future Architecture Technologies in the A architecture profile

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

Purpose

Configuration

Attributes

Field descriptions

Bits [63:32]

P, bit [31]

U, bit [30]

NSK, bit [29] When EL3 is implemented:

Otherwise:

NSU, bit [28] When EL3 is implemented:

Otherwise:

NSH, bit [27] When EL2 is implemented:

Otherwise:

M, bit [26] When EL3 is implemented:

Otherwise:

MT, bit [25] When (FEAT_MTPMU is implemented and enabled) or an IMPLEMENTATION DEFINED multi-threaded PMU Extension is implemented:

Otherwise:

SH, bit [24] When FEAT_SEL2 is implemented and EL3 is implemented:

Otherwise:

T, bit [23] When FEAT_TME is implemented:

Otherwise:

Bits [22:16]

evtCount[15:10], bits [15:10] When FEAT_PMUv3p1 is implemented:

Otherwise:

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

Accessing the PMEVTYPER<n>_EL0

MRS <Xt>, PMEVTYPER<n>_EL0

MSR PMEVTYPER<n>_EL0, <Xt>

NSK, bit [29]

When EL3 is implemented:

NSU, bit [28]

When EL3 is implemented:

NSH, bit [27]

When EL2 is implemented:

M, bit [26]

When EL3 is implemented:

MT, bit [25]

When (FEAT_MTPMU is implemented and enabled) or an IMPLEMENTATION DEFINED multi-threaded PMU Extension is implemented:

SH, bit [24]

When FEAT_SEL2 is implemented and EL3 is implemented:

T, bit [23]

When FEAT_TME is implemented:

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

When FEAT_PMUv3p1 is implemented: