pub unsafe fn __dsb<A>(arg: A) where
Generates a DSB (data synchronization barrier) instruction or equivalent CP15 instruction.
DSB ensures the completion of memory accesses. A DSB behaves as the equivalent DMB and has additional properties. After a DSB instruction completes, all memory accesses of the specified type issued before the DSB are guaranteed to have completed.
The __dsb() intrinsic also acts as a compiler memory barrier of the appropriate type.