AMAIR2

Provides IMPLEMENTATION DEFINED memory attributes for the memory regions specified by MAIR2_EL1.

Configuration

This register is present only when FEAT_AIE is implemented. Otherwise, direct accesses to AMAIR2_EL1 are UNDEFINED.

Attributes

Field descriptions

IMPLEMENTATION DEFINED, bits [63:0]

Accessing AMAIR2_EL1

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

MRS <Xt>, AMAIR2_EL1

op0	op1	CRn	CRm	op2
0b11	0b000	0b1010	0b0011	0b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && SCR_EL3.AIEn == '0' then UNDEFINED; elsif EL2Enabled() && HCR_EL2.TRVM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HFGRTR_EL2.nAMAIR2_EL1 == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.AIEn == '0' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '111' then X[t, 64] = NVMem[0x288]; else X[t, 64] = AMAIR2_EL1; elsif PSTATE.EL == EL2 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && SCR_EL3.AIEn == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.AIEn == '0' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HCR_EL2.E2H == '1' then X[t, 64] = AMAIR2_EL2; else X[t, 64] = AMAIR2_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = AMAIR2_EL1;

MSR AMAIR2_EL1, <Xt>

op0	op1	CRn	CRm	op2
0b11	0b000	0b1010	0b0011	0b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && SCR_EL3.AIEn == '0' then UNDEFINED; elsif EL2Enabled() && HCR_EL2.TVM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HFGWTR_EL2.nAMAIR2_EL1 == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.AIEn == '0' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '111' then NVMem[0x288] = X[t, 64]; else AMAIR2_EL1 = X[t, 64]; elsif PSTATE.EL == EL2 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && SCR_EL3.AIEn == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.AIEn == '0' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HCR_EL2.E2H == '1' then AMAIR2_EL2 = X[t, 64]; else AMAIR2_EL1 = X[t, 64]; elsif PSTATE.EL == EL3 then AMAIR2_EL1 = X[t, 64];

MRS <Xt>, AMAIR2_EL12

op0	op1	CRn	CRm	op2
0b11	0b101	0b1010	0b0011	0b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '101' then X[t, 64] = NVMem[0x288]; elsif EL2Enabled() && HCR_EL2.NV == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then if HCR_EL2.E2H == '1' then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && SCR_EL3.AIEn == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.AIEn == '0' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = AMAIR2_EL1; else UNDEFINED; elsif PSTATE.EL == EL3 then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '1' then X[t, 64] = AMAIR2_EL1; else UNDEFINED;

MSR AMAIR2_EL12, <Xt>

op0	op1	CRn	CRm	op2
0b11	0b101	0b1010	0b0011	0b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '101' then NVMem[0x288] = X[t, 64]; elsif EL2Enabled() && HCR_EL2.NV == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then if HCR_EL2.E2H == '1' then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && SCR_EL3.AIEn == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.AIEn == '0' then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else AMAIR2_EL1 = X[t, 64]; else UNDEFINED; elsif PSTATE.EL == EL3 then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '1' then AMAIR2_EL1 = X[t, 64]; else UNDEFINED;

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
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
IMPLEMENTATION DEFINED

AMAIR2_EL1, Extended Auxiliary Memory Attribute Indirection Register (EL1)

Purpose