GICC_ABPR, CPU Interface Aliased Binary Point Register

The GICC_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.

Configuration

This register is present only when FEAT_GICv3_LEGACY is implemented. Otherwise, direct accesses to GICC_ABPR are RES0.

In systems that support two Security states:

This register is an alias of the Non-secure copy of GICC_BPR.
Non-secure accesses to this register return a shifted value of the binary point.
If ICC_CTLR_EL3.CBPR_EL1NS == 1, Secure accesses to this register access ICC_BPR0_EL1.

Attributes

GICC_ABPR is a 32-bit register.

Field descriptions

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0																													Binary_Point

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. The following list describes how this field determines the interrupt priority bits assigned to the group priority field:

'Secure ICC_BPR1_EL1 Binary Point when CBPR == 0' in ARM® Generic Interrupt Controller Architecture Specification, GIC architecture version 3.0 and version 4.0 (ARM IHI 0069), for the processing of Group 1 interrupts in a GIC implementation that supports interrupt grouping, when GICC_CTLR.CBPR == 0.
'Non-secure ICC_BPR1_EL1 Binary Point when CBPR == 0' in ARM® Generic Interrupt Controller Architecture Specification, GIC architecture version 3.0 and version 4.0 (ARM IHI 0069), for all other cases.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Accessing GICC_ABPR

This register is used only when System register access is not enabled. When System register access is enabled, the System registers ICC_BPR0_EL1 and ICC_BPR1_EL1 provide equivalent functionality.

GICC_ABPR can be accessed through the memory-mapped interfaces:

Component	Offset	Instance
GIC CPU interface	0x001C	GICC_ABPR

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.

26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6