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DMB

Data memory barrier.

Syntax

DMB  option|#imm

Where:

option

Is a barrier option name. The options in the following table are ordered in decreasing scope of the shareability domain. ARM recommends that you use the option names in preference to the equivalent #imm values.

Table 36. Data memory barrier options
optionimmOrdered Accesses (before-after)Shareability domain
LD13Load-Load, Load-Store 
ST14Store-StoreFull system
SY15Any-Any 
OSHLD1Load-Load, Load-Store 
OSHST2Store-StoreOuter shareable
OSH3Any-Any 
ISHLD9Load-Load, Load-Store 
ISHST10Store-StoreInner shareable
ISH11Any-Any 
NSHLD5Load-Load, Load-Store 
NSHST6Store-StoreNon-shareable
NSH7Any-Any 

imm

Is a 4-bit unsigned immediate, in the range 0 to 15.

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