4.3.6. c0, Multiprocessor ID Register

The MPIDR characteristics are:

Purpose

Enables CPUs to be recognized and characterized within a multi-processor system.

Usage constraints

The MPIDR is:

  • a read-only register

  • accessible in Privileged mode only.

Configurations

Available in all processor configurations.

Attributes

Because this is a uniprocessor system, this register is Read-As-Zero.

To access the MPIDR, read CP15 with:

MRC p15, 0, <Rd>, c0, c0, 5 ; Returns Multiprocessor ID information
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