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4.3.82. Configuration Base Address Register, EL1

The CBAR_EL1 characteristics are:

Purpose

Holds the physical base address of the memory-mapped GIC CPU interface registers.

Usage constraints

This register is accessible as follows:

EL0

EL1

(NS)

EL1

(S)

EL2

EL3

(SCR.NS = 1)

EL3

(SCR.NS = 0)

-RORORORORO
Configurations

There is one copy of this register that is used in both Secure and Non-secure states.

Attributes

CBAR_EL1 is a 64-bit register.

Figure 4.75 shows the CBAR_EL1 bit assignments.

Figure 4.75. CBAR_EL1 bit assignments

Figure 4.75. CBAR_EL1 bit assignments

Table 4.128 shows the CBAR_EL1 bit assignments.

Table 4.128. CBAR_EL1 bit assignments
BitsNameFunction
[63:40]-

Reserved, res0.

[39:18]PERIPHBASE[39:18]

The input PERIPHBASE[39:18] determines the reset value.

[17:0]-Reserved, res0.

To access the CBAR_EL1:

MRS <Xt>, S3_1_C15_C3_0 ; Read CBAR_EL1 into Xt