=> R0 = 1 (reason code) + flags
R1 = logical address, if bit 29 set
This call is used to flush the cache, TLB or write buffer. Only use this where it is unavoidable.
MMU Control 1 flags
Bit Meaning if set
8-27 reserved (must be 0)
28 drain write buffer
29 flush one entry (otherwise complete flush)
30 flush processor TLBs
31 flush processor caches
Bit 29 is currently ignored.
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