[PATCH 06/10] ARM: V7M: Implement cache macros for V7M

[Russell King - ARM Linux]

On Mon, Jun 13, 2016 at 04:03:05PM +0100, Vladimir Murzin wrote:
> From: Jonathan Austin <jonathan.austin at arm.com>
> 
> This commit implements the cache operation macros for V7M, paving the way
> for caches to be used on V7 with a future commit.
> 
> Because the cache operations in V7M are memory mapped, in most operations an
> extra register is required compared to the V7 version, where the type of
> operation is encoded in the instruction, not the address that is written to.
> 
> Thus, an extra register argument has been added to the cache operation macros,
> that is required in V7M but ignored/unused in V7. In almost all cases there
> was a spare temporary register, but in places where the register allocation
> was tighter the M_CLASS macro has been used to avoid clobbering new
> registers.

It's probably way more efficient to just implement this as an entirely
separate implementation, rather than trying to bodge this into the v7
stuff.

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