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SYS

System instruction.

This instruction is used by the aliases:

  • AT.
  • DC.
  • IC.
  • TLBI.

Syntax

SYS #op1, Cn, Cm, #op2{, Xt}

Where:

op1
Is a 3-bit unsigned immediate, in the range 0 to 7.
Cn
Is a name Cn, with n in the range 0 to 15.
Cm
Is a name Cm, with m in 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 optional general-purpose source register, defaulting to 31.

Usage

System instruction. For more information, see Op0 equals 0b01, cache maintenance, TLB maintenance, and address translation instructions in the ARM Architecture Reference Manual ARMv8, for ARMv8-A architecture profile for the encodings of System instructions.

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