if you don't want to
add atomic instructions to your FPGA :-)
I did discuss this in our mailing lists. Unfortunately it's not possible
in a really fast way, as you can't write user instructions that access
memory through the cache. A possibility could be to create a single
hardware-Mutex (standard design or within a user instruction) and
protect the atomic instructions with same.
But right now, there is SMP, no MMU, and no privileged instruction
protection, so we can just reset the enable interrupt bit in user space
for a few instructions.
-Michael
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