Comments (2)
phthinh
commented on July 26, 2024
1
Thanks for your hint! I have a small modification inside the kernel in the process.c file to enable RoCC. Custom instructions are able to be run with RoCC at the Linux userspace.
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seldridge
commented on July 26, 2024
This shouldn't be handled at the BBL level, but inside the kernel via context switch code. The quick and dirty hack is to set SR_XS whenever a process gets swapped in similar to how SR_FS works. Note: that doing this without saving and restoring the RoCC's state is going to result in bugs
If you search for usages of SR_FS* (see: csr.h) you should get some idea of how to do this.
There's an old thread about this over on riscv-linux with a much more detailed explanation.
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