ATS1CUW, Address Translate Stage 1 Current state Unprivileged Write

The ATS1CUW characteristics are:

Purpose

Performs stage 1 address translation as defined for PL0 and the current Security state, with permissions as if writing to the given virtual address.

Configuration

This instruction is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to ATS1CUW are UNDEFINED.

Attributes

ATS1CUW is a 32-bit System instruction.

Field descriptions

The ATS1CUW input value bit assignments are:

Bits [31:0]

Input address for translation. The resulting address can be read from the PAR.

This System instruction takes a VA as input. If EL2 is implemented and enabled in the current Security state, the resulting address is the IPA that is the output address of the stage 1 translation. Otherwise, the resulting address is a PA.

if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T7 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T7 == '1' then
        AArch32.TakeHypTrapException(0x03);
    else
        ATS1CUW(R[t]);
elsif PSTATE.EL == EL2 then
    ATS1CUW(R[t]);
elsif PSTATE.EL == EL3 then
    ATS1CUW(R[t]);