ARM Cortex-A76 Core Technical Reference Manual page 268

Aff1, [15:11]
Aff1, [10:8]
Aff0, [7:0]
Configurations
100798_0300_00_en
CLUSTERID
Indicates the value read in the CLUSTERIDAFF2 configuration signal.
Part of Affinity level 1. Third highest level affinity field.
RAZ Read-As-Zero.
Part of Affinity level 1. Third highest level affinity field.
CPUID. Identification number for each CPU in the Cortex-A76 cluster:
MP1: CPUID: 0.
0x0
to
MP8: CPUID: 7.
0x7
Affinity level 0. The level identifies individual threads within a multithreaded core. The
Cortex-A76 core is single-threaded, so this field has the value
MPIDR_EL1[31:0] is mapped to external register EDDEVAFF0.
MPIDR_EL1[63:32] is mapped to external register EDDEVAFF1.
Bit fields and details that are not provided in this description are architecturally defined. See the
Arm Architecture Reference Manual Armv8, for Armv8-A architecture profile.
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B2.85 MPIDR_EL1, Multiprocessor Affinity Register, EL1
reserved.
Non-Confidential
B2 AArch64 system registers
.
0x00
B2-268