dmb

Data Memory Barrier

DMB <option>

Ensures memory access ordering.

Pseudocode Operation

Barrier(option)

Example

DMB option

Encoding

Binary Layout

11010101000000110011

31:12

CRm

11:8

1

7

01

6:5

11111

4:0

 

Format System

Opcode 0xD50330BF

Extension Base

Operands

• option
  Barrier type (SY, ISH, etc)

Related

Other forms of dmb

• dmb Data Memory Barrier (Thumb)
• dmb Data Memory Barrier (A32)

Across architectures

Memory Barrier / Fence : how x86, ARM, RISC-V, and PowerISA each do this.

More in Base

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD50330BF	DMB (<option>|#<imm>)		A64		11010101000000110011 | CRm | 1 | 01 | 11111

Description

Data Memory Barrier is a memory barrier that ensures the ordering of observations of memory accesses, see Data Memory Barrier.

Operation

DataMemoryBarrier(domain, types);