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ATS12NSOUR: Address Translate Stages 1 and 2 Non-secure Only Unprivileged Read

Purpose

Performs stage 1 and 2 address translations as defined for PL0 and the Non-secure state, with permissions as if reading from the given virtual address.

Configuration

This instruction is present only when EL2 is capable of using AArch32. Otherwise, direct accesses to ATS12NSOUR are UNDEFINED.

Attributes

ATS12NSOUR is a 32-bit System instruction.

Field descriptions

313029282726252423222120191817161514131211109876543210
Input address for translation

Bits [31:0]

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

This System instruction takes a VA as input. The resulting address is the PA that is the output address of the stage 2 translation.

Executing ATS12NSOUR

Accesses to this instruction use the following encodings in the System instruction encoding space:

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

coprocopc1CRnCRmopc2
0b11110b0000b01110b10000b110

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); elsif !ELUsingAArch32(EL2) && SCR_EL3.<NS,EEL2> == '01' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif !ELUsingAArch32(EL3) && SCR_EL3.NS == '0' then AArch64.AArch32SystemAccessTrap(EL3, 0x03); else UNDEFINED; elsif PSTATE.EL == EL2 then AArch32.AT(R[t], TranslationStage_12, EL0, ATAccess_Read); elsif PSTATE.EL == EL3 then AArch32.AT(R[t], TranslationStage_12, EL0, ATAccess_Read);