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
The HAMAIR1 bit assignments are:
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| IMPLEMENTATION DEFINED | |||||||||||||||||||||||||||||||
If an implementation does not provide any IMPLEMENTATION DEFINED memory attributes, this register is RES0.
IMPLEMENTATION DEFINED, bits [31:0]
IMPLEMENTATION DEFINED.
This field resets to an architecturally UNKNOWN value.
Accessing the HAMAIR1
Accesses to this register use the following encodings:
MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b100 | 0b1010 | 0b0011 | 0b001 |
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>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b100 | 0b1010 | 0b0011 | 0b001 |
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];