at

Address Translate

AT <op>, <Xt>

Translates a virtual address to a physical address (for debug/software).

Pseudocode Operation

paResult ← TranslateAddress(op, virtAddr ← Xt); // Result written to PAR_EL1; op determines EL and access mode

Example

AT op, x3

Encoding

Binary Layout

1101010100

31:22

0

21

01

20:19

op1

18:16

0111

15:12

CRm

11:8

op2

7:5

Rt

4:0

 

Format System Alias

Opcode 0xD5087800

Extension System

Operands

• Xt
  Virtual Addr

Related

Other forms of at

• at Address Translate (Stage 1 Current)
• at Address Translate (Stage 1 Write)

More in System

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD5087800	AT <at_op>, <Xt>		A64		1101010100 | 0 | 01 | op1 | 0111 | CRm | op2 | Rt

Description

Address Translate. For more information, see op0==0b01, cache maintenance, TLB maintenance, and address translation instructions.