B2.4 AArch64 registers by functional group
This section identifies the AArch64 registers by their functional groups and applies to the registers in the
core that are implementation defined or have micro-architectural bit fields. Reset values are provided for
these registers.
Identification registers
Name Type Reset Description
AIDR_EL1 RO
0x00000000
B2.14 AIDR_EL1, Auxiliary ID Register, EL1
on page B2-155
CCSIDR__EL1 RO
- B2.18 CCSIDR_EL1, Cache Size ID Register, EL1
on page B2-159
CLIDR_EL1 RO • 0xC3000123 if L3 cache present.
• 0x82000023 if no L3 cache.
B2.19 CLIDR_EL1, Cache Level ID Register, EL1
on page B2-161
CSSELR_EL1 RW
UNK B2.32 CSSELR_EL1, Cache Size Selection Register, EL1
on page B2-190
CTR_EL0 RO
0x8444C004
B2.33 CTR_EL0, Cache Type Register, EL0 on page B2-191
DCZID_EL0 RO
0x00000004
B2.34 DCZID_EL0, Data Cache Zero ID Register, EL0
on page B2-193
ERRIDR_EL1 RO
0x00000002
B2.36 ERRIDR_EL1, Error ID Register, EL1
on page B2-196
ID_AA64AFR0_EL1 RO
0x00000000
B2.52 ID_AA64AFR0_EL1, AArch64 Auxiliary Feature
Register 0 on page B2-214
ID_AA64AFR1_EL1 RO
0x00000000
B2.53 ID_AA64AFR1_EL1, AArch64 Auxiliary Feature
Register 1 on page B2-215
ID_AA64DFR0_EL1 RO
0x0000000010305408
B2.54 ID_AA64DFR0_EL1, AArch64 Debug Feature
Register 0, EL1 on page B2-216
ID_AA64DFR1_EL1 RO
0x00000000
B2.55 ID_AA64DFR1_EL1, AArch64 Debug Feature
Register 1, EL1 on page B2-218
ID_AA64ISAR0_EL1 RO • 0x0000100010211120 if the
Cryptographic Extension is
implemented.
• 0x0000100010210000 if the
Cryptographic Extension is not
implemented.
B2.56 ID_AA64ISAR0_EL1, AArch64 Instruction Set
Attribute Register 0, EL1 on page B2-219
ID_AA64ISAR1_EL1 RO
0x0000000000100001
B2.57 ID_AA64ISAR1_EL1, AArch64 Instruction Set
Attribute Register 1, EL1 on page B2-221
ID_AA64MMFR0_EL1 RO
0x0000000000101122
B2.58 ID_AA64MMFR0_EL1, AArch64 Memory Model
Feature Register 0, EL1 on page B2-222
ID_AA64MMFR1_EL1 RO
0x0000000010212122
B2.59 ID_AA64MMFR1_EL1, AArch64 Memory Model
Feature Register 1, EL1 on page B2-224
B2 AArch64 system registers
B2.4 AArch64 registers by functional group
100798_0300_00_en Copyright © 2016–2018 Arm Limited or its affiliates. All rights
reserved.
B2-136
Non-Confidential
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