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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] .

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

RW fields in this register reset to architecturally UNKNOWN values.

Attributes

HPFAR is a 32-bit register.

Field descriptions

The HPFAR bit assignments are:

313029282726252423222120191817161514131211109876543210
FIPA[39:12]0000

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>}

opc1opc2CRncoprocCRm
0b1000b1000b01100b11110b0000
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>}

opc1opc2CRncoprocCRm
0b1000b1000b01100b11110b0000
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];
              


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