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FCSEIDR, FCSE Process ID register

The FCSEIDR characteristics are:

Purpose

Identifies whether the Fast Context Switch Extension (FCSE) is implemented.

From Armv8, the FCSE is not implemented, so this register is RAZ/WI. Software can access this register to determine that the implementation does not include the FCSE.

Configuration

Attributes

FCSEIDR is a 32-bit register.

Field descriptions

The FCSEIDR bit assignments are:

313029282726252423222120191817161514131211109876543210
RAZ/WI

Bits [31:0]

Reserved, RAZ/WI.

Accessing the FCSEIDR

Accesses to this register use the following encodings:

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

coprocopc1CRnCRmopc2
0b11110b0000b11010b00000b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T13 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T13 == '1' then
        AArch32.TakeHypTrapException(0x03);
    else
        return FCSEIDR;
elsif PSTATE.EL == EL2 then
    return FCSEIDR;
elsif PSTATE.EL == EL3 then
    return FCSEIDR;
              

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

coprocopc1CRnCRmopc2
0b11110b0000b11010b00000b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T13 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T13 == '1' then
        AArch32.TakeHypTrapException(0x03);
    else
        FCSEIDR = R[t];
elsif PSTATE.EL == EL2 then
    FCSEIDR = R[t];
elsif PSTATE.EL == EL3 then
    FCSEIDR = R[t];
              


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