B4.6 ICC_BPR1_EL1, Interrupt Controller Binary Point Register 1, EL1
ICC_BPR1_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 Group 1 interrupt preemption.
Bit field descriptions
ICC_BPR1_EL1 is a 32-bit register and is part of:
• The GIC system registers functional group.
• The GIC control registers functional group.
31
0
2
3
BinaryPoint
RES0
Figure B4-2 ICC_BPR1_EL1 bit assignments
RES0, [31:3]
Reserved, RES0.
BinaryPoint, [2:0]
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 implemented of ICC_BPR1_EL1 Secure register is 0x2.
The minimum value implemented of ICC_BPR1_EL1 Non-secure register is 0x3.
Bit fields and details that are not provided in this description are architecturally defined. See the Arm
®
Generic Interrupt Controller Architecture Specification.
B4 GIC registers
B4.6 ICC_BPR1_EL1, Interrupt Controller Binary Point Register 1, EL1
100798_0300_00_en Copyright © 2016–2018 Arm Limited or its affiliates. All rights
reserved.
B4-318
Non-Confidential
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