REVIDR

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REVIDR_EL1, Revision ID Register

Purpose

Configuration

AArch64 System register REVIDR_EL1 bits [31:0] are architecturally mapped to AArch32 System register REVIDR[31:0].

This register is present only when FEAT_AA64 is implemented. Otherwise, direct accesses to REVIDR_EL1 are UNDEFINED.

If REVIDR_EL1 has the same value as MIDR_EL1, then its contents have no significance.

Attributes

Field descriptions

IMPLEMENTATION DEFINED, bits [63:0]

Accessing REVIDR_EL1

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

MRS <Xt>, REVIDR_EL1

op0	op1	CRn	CRm	op2
0b11	0b000	0b0000	0b0000	0b110

if !IsFeatureImplemented(FEAT_AA64) then UnimplementedIDRegister(); elsif PSTATE.EL == EL0 then if IsFeatureImplemented(FEAT_IDST) then if EL2Enabled() && HCR_EL2().TGE == '1' then AArch64_SystemAccessTrap(EL2, 0x18); else AArch64_SystemAccessTrap(EL1, 0x18); end; else Undefined(); end; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2().TID1 == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3().FGTEn == '1') && HFGRTR_EL2().REVIDR_EL1 == '1' then AArch64_SystemAccessTrap(EL2, 0x18); else X{64}(t) = REVIDR_EL1(); end; elsif PSTATE.EL == EL2 then X{64}(t) = REVIDR_EL1(); elsif PSTATE.EL == EL3 then X{64}(t) = REVIDR_EL1(); end;

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