Is there a simple method to keep memory coherent between two different cpus

Here I want to share a block of physical memory between two different cpus.
I want to simple use original real mode memory address.
Is there a simple way to invalid linux memory cache after writing to and 
before reading from it?
ex. invalid_cache_range(u32 phy_address, u32 length).


My cpu is arm. Thanks.




 
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