HAMAIR1, Hyp Auxiliary Memory Attribute Indirection Register 1

The HAMAIR1 characteristics are:

Purpose

Provides IMPLEMENTATION DEFINED memory attributes for the memory attribute encodings defined by HMAIR1. These IMPLEMENTATION DEFINED attributes can only provide additional qualifiers for the memory attribute encodings, and cannot change the memory attributes defined in HMAIR1.

Configuration

AArch32 System register HAMAIR1 bits [31:0] are architecturally mapped to AArch64 System register AMAIR_EL2[63:32].

This register is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to HAMAIR1 are UNDEFINED.

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

Attributes

HAMAIR1 is a 32-bit register.

Field descriptions

313029282726252423222120191817161514131211109876543210
IMPLEMENTATION DEFINED

If an implementation does not provide any IMPLEMENTATION DEFINED memory attributes, this register is RES0.

IMPLEMENTATION DEFINED, bits [31:0]

IMPLEMENTATION DEFINED.

The reset behaviour of this field is:

Accessing HAMAIR1

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

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

coprocopc1CRnCRmopc2
0b11110b1000b10100b00110b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T10 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T10 == '1' then AArch32.TakeHypTrapException(0x03); else UNDEFINED; elsif PSTATE.EL == EL2 then return HAMAIR1; elsif PSTATE.EL == EL3 then if SCR.NS == '0' then UNDEFINED; else return HAMAIR1;

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

coprocopc1CRnCRmopc2
0b11110b1000b10100b00110b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T10 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T10 == '1' then AArch32.TakeHypTrapException(0x03); else UNDEFINED; elsif PSTATE.EL == EL2 then HAMAIR1 = R[t]; elsif PSTATE.EL == EL3 then if SCR.NS == '0' then UNDEFINED; else HAMAIR1 = R[t];


30/06/2021 09:39; 4f5dd962f4e34e1ac282f76da4d6e7fc4cab087e

Copyright © 2010-2021 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.