ID_AFR0_EL1, AArch32 Auxiliary Feature Register 0
The ID_AFR0_EL1 characteristics are:
Purpose
Provides information about the IMPLEMENTATION DEFINED features of the PE in AArch32 state.
Must be interpreted with the Main ID Register, MIDR_EL1.
For general information about the interpretation of the ID registers see 'Principles of the ID scheme for fields in ID registers' in the Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile, section D10.4.1.
Configuration
AArch64 System register ID_AFR0_EL1 bits [31:0] are architecturally mapped to AArch32 System register ID_AFR0[31:0] .
In an implementation that supports only AArch64 state, this register is UNKNOWN.
Attributes
ID_AFR0_EL1 is a 64-bit register.
Field descriptions
The ID_AFR0_EL1 bit assignments are:
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 |
RES0 | |||||||||||||||||||||||||||||||
RES0 | IMPLEMENTATION DEFINED | IMPLEMENTATION DEFINED | IMPLEMENTATION DEFINED | IMPLEMENTATION DEFINED | |||||||||||||||||||||||||||
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 |
Bits [63:16]
Reserved, RES0.
IMPLEMENTATION DEFINED, bits [15:12]
IMPLEMENTATION DEFINED.
IMPLEMENTATION DEFINED, bits [11:8]
IMPLEMENTATION DEFINED.
IMPLEMENTATION DEFINED, bits [7:4]
IMPLEMENTATION DEFINED.
IMPLEMENTATION DEFINED, bits [3:0]
IMPLEMENTATION DEFINED.
Accessing the ID_AFR0_EL1
Accesses to this register use the following encodings:
MRS <Xt>, ID_AFR0_EL1
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b000 | 0b0000 | 0b0001 | 0b011 |
if PSTATE.EL == EL0 then if IsFeatureImplemented("ARMv8.4-IDST") then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); else UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TID1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else return ID_AFR0_EL1; elsif PSTATE.EL == EL2 then return ID_AFR0_EL1; elsif PSTATE.EL == EL3 then return ID_AFR0_EL1;