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The ACTLR2 provides extra space to the ACTLR register to hold implementation defined trap functionality for execution at EL1 and EL0.
ACTLR2 is a 32-bit register, and is part of:
AArch32 System register ACTLR2 is architecturally mapped to AArch64 System register ACTLR_EL1[63:32]. See B2.5 ACTLR_EL1, Auxiliary Control Register, EL1.
AArch32 register ACTLR2(S) is architecturally mapped to AArch64 register ACTLR_EL3[63:32]. See B2.7 ACTLR_EL3, Auxiliary Control Register, EL3.
Bit fields and details not provided in this description are architecturally defined. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile.