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ICV_BPR0_EL1 defines the point at which the priority value fields split into two parts, the group priority field and the subpriority field. The group priority field determines virtual Group 0 interrupt preemption.
ICC_BPR0_EL1 is a 32-bit register and is part of the virtual GIC system registers functional group.
The value of this field controls how the 8-bit interrupt priority field is split into a group priority field, that determines interrupt preemption, and a subpriority field. The minimum value that is implemented is:
Bit fields and details that are not provided in this description are architecturally defined. See the Arm® Generic Interrupt Controller Architecture Specification.