The HAMAIR0 characteristics are:
Provides IMPLEMENTATION DEFINED memory attributes for the memory attribute encodings defined by HMAIR0. These IMPLEMENTATION DEFINED attributes can only provide additional qualifiers for the memory attribute encodings, and cannot change the memory attributes defined in HMAIR0.
AArch32 System register HAMAIR0 bits [31:0] are architecturally mapped to AArch64 System register AMAIR_EL2[31:0].
This register is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to HAMAIR0 are UNDEFINED.
If EL2 is not implemented, this register is RES0 from EL3.
HAMAIR0 is a 32-bit register.
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.
The reset behaviour of this field is:
Accesses to this register use the following encodings in the System register encoding space:
coproc | opc1 | CRn | CRm | opc2 |
---|---|---|---|---|
0b1111 | 0b100 | 0b1010 | 0b0011 | 0b000 |
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 HAMAIR0; elsif PSTATE.EL == EL3 then if SCR.NS == '0' then UNDEFINED; else return HAMAIR0;
coproc | opc1 | CRn | CRm | opc2 |
---|---|---|---|---|
0b1111 | 0b100 | 0b1010 | 0b0011 | 0b000 |
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 HAMAIR0 = R[t]; elsif PSTATE.EL == EL3 then if SCR.NS == '0' then UNDEFINED; else HAMAIR0 = R[t];
30/06/2021 09:39; 4f5dd962f4e34e1ac282f76da4d6e7fc4cab087e
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