4.3.56. Configuration Base Address Register

The CBAR characteristics are:

Purpose

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

Usage constraints

The CBAR is:

  • A read-only register.

  • Common to the Secure and Non-secure states.

  • Only accessible from PL1 or higher.

Configurations

Available in all configurations.

Attributes

See the register summary in Table 4.14.

Figure 4.41 shows the CBAR bit assignments.

Figure 4.41. CBAR bit assignments

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Table 4.76 shows the CBAR bit assignments.

Table 4.76. CBAR bit assignments

BitsNameFunction
[31:15]PERIPHBASE[31:15]

The primary input PERIPHBASE[31:15] determines the reset value

[11:8]-

Reserved, UNK/SBZP

[7:0]PERIPHBASE[39:32]

The primary input PERIPHBASE[39:32] determines the reset value


To access the CBAR, read the CP15 register with:

MRC p15, 4, <Rt>, c15, c0, 0; Read Configuration Base Address Register
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