ATS1CUR, Address Translate Stage 1 Current state Unprivileged Read

The ATS1CUR characteristics are:

Purpose

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

Configuration

This instruction is present only when AArch32 is supported at EL0. Otherwise, direct accesses to ATS1CUR are UNDEFINED.

Attributes

ATS1CUR 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. 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.

Executing the ATS1CUR instruction

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

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

coprocopc1CRnCRmopc2
0b11110b0000b01110b10000b010

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 ATS1CUR(R[t]); elsif PSTATE.EL == EL2 then ATS1CUR(R[t]); elsif PSTATE.EL == EL3 then ATS1CUR(R[t]);


30/06/2021 15:21; 2a17f7750cfd1ab239f20f6cf29877ba8041794f

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