Configuration Base Address Register
The CBAR 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
(NS)
EL0
(S)
EL1
(NS)
EL1
(S)
EL2 EL3
(SCR.NS = 1)
EL3
(SCR.NS = 0)
- - RO RO RO RO RO - Configurations
-
The CBAR is Common to the Secure and Non-secure states.
- Attributes
-
CBAR is a 32-bit register.
Figure 4.144 shows the CBAR bit assignments.
Table 4.258 shows the CBAR bit assignments.
| Bits | Name | Function |
|---|---|---|
| [31:18] | PERIPHBASE[31:18] |
The input PERIPHBASE[31:18] determines the reset value. |
| [17:8] | - |
Reserved, res0. |
| [7:0] | PERIPHBASE[39:32] |
The input PERIPHBASE[39:32] determines the reset value. |
To access the CBAR:
MRC p15, 1, <Rt>, c15, c3, 0; Read CBAR into Rt