You copied the Doc URL to your clipboard.

AMEVCNTVOFF0<n>_EL2, Activity Monitors Event Counter Virtual Offset Registers 0, n = 0 - 15

The AMEVCNTVOFF0<n>_EL2 characteristics are:

Purpose

Holds the 64-bit virtual offset for architected activity monitor events.

Configuration

This register is present only when ARMv8.6-AMU is implemented. Otherwise, direct accesses to AMEVCNTVOFF0<n>_EL2 are UNDEFINED.

RW fields in this register reset to architecturally UNKNOWN values.

Attributes

AMEVCNTVOFF0<n>_EL2 is a 64-bit register.

Field descriptions

The AMEVCNTVOFF0<n>_EL2 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
Virtual offset
Virtual offset
313029282726252423222120191817161514131211109876543210

Bits [63:0]

Virtual offset.

This field resets to an architecturally UNKNOWN value.

Accessing the AMEVCNTVOFF0<n>_EL2

If <n> is not 0, 2 or 3, reads and writes of AMEVCNTVOFF0<n>_EL2 are UNDEFINED.

Accesses to this register use the following encodings:

MRS <Xt>, AMEVCNTVOFF0<n>_EL2

op0op1CRnCRmop2
0b110b1000b11010b100:n[3]n[2:0]
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.<NV2,NV> == '11' then
        return NVMem[0xA00+8*UInt(CRm<0>:op2<2:0>)];
    elsif EL2Enabled() && HCR_EL2.NV == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.AMVOFFEN == '0' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TAM == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return AMEVCNTVOFF0_EL2[UInt(CRm<0>:op2<2:0>)];
elsif PSTATE.EL == EL3 then
    return AMEVCNTVOFF0_EL2[UInt(CRm<0>:op2<2:0>)];
              

MSR AMEVCNTVOFF0<n>_EL2, <Xt>

op0op1CRnCRmop2
0b110b1000b11010b100:n[3]n[2:0]
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.<NV2,NV> == '11' then
        NVMem[0xA00+8*UInt(CRm<0>:op2<2:0>)] = X[t];
    elsif EL2Enabled() && HCR_EL2.NV == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    AMEVCNTVOFF0_EL2[UInt(CRm<0>:op2<2:0>)] = X[t];
elsif PSTATE.EL == EL3 then
    AMEVCNTVOFF0_EL2[UInt(CRm<0>:op2<2:0>)] = X[t];
              


Was this page helpful? Yes No