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4.3.33. Auxiliary Control Register, EL3

The ACTLR_EL3 characteristics are:

Purpose

Controls write access to implementation defined registers in EL2, such as CPUACTLR, CPUECTLR, L2CTLR, L2ECTLR and L2ACTLR.

Usage constraints

This register is accessible as follows:

EL0

EL1

(NS)

EL1

(S)

EL2

EL3

(SCR.NS = 1)

EL3

(SCR.NS = 0)

----RWRW
Configurations

ACTLR_EL3 is mapped to AArch32 register ACTLR (S). See Auxiliary Control Register.

Attributes

ACTLR_EL3 is a 32-bit register.

Figure 4.30 shows the ACTLR_EL3 bit assignments.

Figure 4.30. ACTLR_EL3 bit assignments

Figure 4.30. ACTLR_EL3 bit assignments

Table 4.74 shows the ACTLR_EL3 bit assignments.

Table 4.74. ACTLR_EL3 bit assignments
BitsNameFunction
[31:7]-

Reserved, res0.

[6]L2ACTLR_EL1 access control

L2ACTLR_EL1 write access control. The possible values are:

0

The register is not write accessible from a lower exception level. This is the reset value.

1

The register is write accessible from EL2.

[5]L2ECTLR_EL1 access control

L2ECTLR_EL1 write access control. The possible values are:

0

The register is not write accessible from a lower exception level. This is the reset value.

1

The register is write accessible from EL2.

[4]L2CTLR_EL1 access control

L2CTLR_EL1 write access control. The possible values are:

0

The register is not write accessible from a lower exception level. This is the reset value.

1

The register is write accessible from EL2.

[3:2]-Reserved, res0.
[1]CPUECTLR_EL1 access control

CPUECTLR_EL1 write access control. The possible values are:

0

The register is not write accessible from a lower exception level. This is the reset value.

1

The register is write accessible from EL2.

[0]CPUACTLR_EL1 access control

CPUACTLR_EL1 write access control. The possible values are:

0

The register is not write accessible from a lower exception level. This is the reset value.

1

The register is write accessible from EL2.


To access the ACTLR_EL3:

MRS <Xt>, ACTLR_EL3 ; Read ACTLR_EL3 into Xt
MSR ACTLR_EL3, <Xt> ; Write Xt to ACTLR_EL3