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16.21 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_opop1op2
S12E0R46
S12E0W47
S12E1R44
S12E1W45
S1E0R02
S1E0W03
S1E1R00
S1E1W01
S1E2R40
S1E2W41
S1E3R60
S1E3W61
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