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HPFAR, Hyp IPA Fault Address Register

The HPFAR characteristics are:

Purpose

Holds the faulting IPA for some aborts on a stage 2 translation taken to Hyp mode.

Configuration

AArch32 System register HPFAR bits [31:0] are architecturally mapped to AArch64 System register HPFAR_EL2[31:0] .

This register is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to HPFAR are UNDEFINED.

If EL2 is not implemented, this register is RES0 from EL3.

Attributes

HPFAR is a 32-bit register.

Field descriptions

The HPFAR bit assignments are:

313029282726252423222120191817161514131211109876543210
FIPA[39:12]RES0

Execution in any Non-secure mode other than Hyp mode makes this register UNKNOWN.

FIPA[39:12], bits [31:4]

Bits [39:12] of the faulting intermediate physical address.

This field resets to an architecturally UNKNOWN value.

Bits [3:0]

Reserved, RES0.

Accessing the HPFAR

Accesses to this register use the following encodings:

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

coprocopc1CRnCRmopc2
0b11110b1000b01100b00000b100
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T6 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T6 == '1' then
        AArch32.TakeHypTrapException(0x03);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    return HPFAR;
elsif PSTATE.EL == EL3 then
    if SCR.NS == '0' then
        UNDEFINED;
    else
        return HPFAR;
              

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

coprocopc1CRnCRmopc2
0b11110b1000b01100b00000b100
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T6 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T6 == '1' then
        AArch32.TakeHypTrapException(0x03);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    HPFAR = R[t];
elsif PSTATE.EL == EL3 then
    if SCR.NS == '0' then
        UNDEFINED;
    else
        HPFAR = R[t];