dcbi

Data Cache Block Invalidate

dcbi RA, RB

Invalidates a cache block (Privileged).

Details

Invalidates the data cache block at effective address (RA + RB), removing it from the cache. This is a privileged instruction used for cache management. The instruction does not modify condition registers and may trigger cache coherency operations on multiprocessor systems.

Pseudocode Operation

EA ← (RA) + (RB)
Invalidate cache block at EA

Programming Note

Privileged. Invalidates a cache block without writeback. Use only when you know the block is clean or its contents can be discarded.

Example

dcbi r4, r5

Encoding

Binary Layout
31
0
/
6
RA
11
RB
16
470
21
/
31
 
Format X-form
Opcode 0x7C0003AE
Extension Privileged

Operands

  • RA
    Base
  • RB
    Index