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AT

Address Translate.

This instruction is an alias of SYS.

Syntax

AT at_op, Xt

Equivalent to SYS #op1, C7, C8, #op2, Xt.

Where:

at_op

Is an AT operation name, as listed for the AT system operation group, and can be one of the values shown in Usage.

op1

Is a 3-bit unsigned immediate, in the range 0 to 7.

op2

Is a 3-bit unsigned immediate, in the range 0 to 7.

Xt

Is the 64-bit name of the general-purpose source register.

Usage

Address Translate. For more information, see A64 system instructions for address translation in the ARMv8-A Architecture Reference Manual.

The following table shows the valid specifier combinations:

Table 16-4 SYS parameter values corresponding to AT operations

at_op op1 op2
S12E0R 4 6
S12E0W 4 7
S12E1R 4 4
S12E1W 4 5
S1E0R 0 2
S1E0W 0 3
S1E1R 0 0
S1E1W 0 1
S1E2R 4 0
S1E2W 4 1
S1E3R 6 0
S1E3W 6 1
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