Moved decision of legal CSR accesses from decoder to cs_registers. (!158) · Merge requests · OpenHW Group / backup-20241120 / cv32e40x

Eclipse Webmaster requested to merge github/fork/silabs-oysteink/silabs-oysteink_csr-decode into master Jul 30, 2021

Created by: silabs-oysteink

Also killing CSR writes with csr_en instead of changing csr_op. EX stage will deassert write enables and set ex_wb_pipe.illegal_insn in case of illegal CSR instructions.

SEC equivalent under the following assumption:

No illegal CSR instructions (csr_en would stay high until EX, causing stalls)

Signed-off-by: Oystein Knauserud Oystein.Knauserud@silabs.com

Moved decision of legal CSR accesses from decoder to cs_registers.

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