flushing datacache on linux

What is the standard way to manipulate the data-cache on linux from a user-mode program?

I'd like to writeback and invalidate the data开发者_高级运维-cache of a memory region that that is shared between my user-mode program and a peripheral device.

Linux has no driver for it, and writing one myself would be overkill for the simple things I want to do...

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How do you share the memory region without a driver?

But anyway, look at the msync functions.