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AT
Address Translate.
This instruction is an alias of SYS.
The equivalent instruction is SYS #.op1, C7, Cm, #op2, Xt
Syntax
AT
at_op, Xt
Where:
at_op- Is an AT instruction name, as listed for the AT system instruction group, and can be one of the values shown in Usage.
op1- Is a 3-bit unsigned immediate, in the range 0 to 7.
Cm- Is a name
Cm, withmin the range 0 to 15. 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 ARM Architecture Reference Manual ARMv8, for ARMv8-A architecture profile.
The following table shows the valid specifier combinations:
Table 16-4 SYS parameter values corresponding to AT operations
at_op |
op1 |
Cm |
op2 |
|---|---|---|---|
| S12E0R | 4 | 0 | 6 |
| S12E0W | 4 | 0 | 7 |
| S12E1R | 4 | 0 | 4 |
| S12E1W | 4 | 0 | 5 |
| S1E0R | 0 | 0 | 2 |
| S1E0W | 0 | 0 | 3 |
| S1E1R | 0 | 0 | 0 |
| S1E1RP | 0 | 1 | 0 |
| S1E1W | 0 | 0 | 1 |
| S1E1WP | 0 | 1 | 1 |
| S1E2R | 4 | 0 | 0 |
| S1E2W | 4 | 0 | 1 |
| S1E3R | 6 | 0 | 0 |
| S1E3W | 6 | 0 | 1 |