ID_AA64AFR0_EL1, AArch64 Auxiliary Feature Register 0

The ID_AA64AFR0_EL1 characteristics are:

Purpose

Provides information about the IMPLEMENTATION DEFINED features of the PE in AArch64 state.

For general information about the interpretation of the ID registers, see 'Principles of the ID scheme for fields in ID registers'.

Configuration

There are no configuration notes.

Attributes

ID_AA64AFR0_EL1 is a 64-bit register.

Field descriptions

The ID_AA64AFR0_EL1 bit assignments are:

Bits [63:32]

Reserved, RES0.

IMPLEMENTATION DEFINED, bits [31:28]

IMPLEMENTATION DEFINED.

IMPLEMENTATION DEFINED, bits [27:24]

IMPLEMENTATION DEFINED.

IMPLEMENTATION DEFINED, bits [23:20]

IMPLEMENTATION DEFINED.

IMPLEMENTATION DEFINED, bits [19:16]

IMPLEMENTATION DEFINED.

IMPLEMENTATION DEFINED, bits [15:12]

IMPLEMENTATION DEFINED.

IMPLEMENTATION DEFINED, bits [11:8]

IMPLEMENTATION DEFINED.

IMPLEMENTATION DEFINED, bits [7:4]

IMPLEMENTATION DEFINED.

IMPLEMENTATION DEFINED, bits [3:0]

IMPLEMENTATION DEFINED.

if PSTATE.EL == EL0 then
    if IsFeatureImplemented(FEAT_IDST) then
        if EL2Enabled() && HCR_EL2.TGE == '1' then
            AArch64.SystemAccessTrap(EL2, 0x18);
        else
            AArch64.SystemAccessTrap(EL1, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.TID3 == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    else
        return ID_AA64AFR0_EL1;
elsif PSTATE.EL == EL2 then
    return ID_AA64AFR0_EL1;
elsif PSTATE.EL == EL3 then
    return ID_AA64AFR0_EL1;