csky: C-SKY SMP supported.
This is the first verion for C-SKY SMP. It only support ck860mp and up
to 4 cores.
ck860mp introduce some new features for atomic operation, eg:
- ldex/stex
- tlbi
- mem barreior
- soc multi-cores reset controller
It's new start point for C-SKY high performance SMP CPU.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
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