GICV_ABPR, Virtual Machine Aliased Binary Point Register

The GICV_ABPR characteristics are:

Purpose

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.

This register corresponds to GICC_ABPR in the physical CPU interface.

Configuration

This register is available when the GIC implementation supports interrupt virtualization.

Attributes

GICV_ABPR is a 32-bit register.

Field descriptions

The GICV_ABPR bit assignments are:

Bits [31:3]

Reserved, RES0.

Binary_Point, bits [2:0]

Controls how the 8-bit interrupt priority field is split into a group priority field, that determines interrupt preemption, and a subpriority field.

For information about how this field determines the interrupt priority bits assigned to the group priority field, see 'Priority grouping' in ARM® Generic Interrupt Controller Architecture Specification, GIC architecture version 3.0 and version 4.0 (ARM IHI 0069).

This field resets to 0.

Accessing the GICV_ABPR

This register is used only when System register access is not enabled. When System register access is enabled:

• For AArch32 implementations, ICC_BPR1 provides equivalent functionality.
• For AArch64 implementations, ICC_BPR1_EL1 provides equivalent functionality.

The value contained in this register is one greater than the actual applied binary point value, as described in 'Priority grouping' in ARM® Generic Interrupt Controller Architecture Specification, GIC architecture version 3.0 and version 4.0 (ARM IHI 0069).

This register is used for Group 1 interrupts when GICV_CTLR.CBPR == 0. GICV_BPR provides equivalent functionality for Group 0 interrupts, and for Group 1 interrupts when GICV_CTLR.CBPR == 1.

GICV_ABPR can be accessed through the memory-mapped interfaces:

This interface is accessible as follows:

• When GICD_CTLR.DS == 0 accesses to this register are RW.
• When an access is Secure accesses to this register are RW.
• When an access is Non-secure accesses to this register are RW.