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BOOM lacks efficient WFI support
See original GitHub issueLegally, WFI (wait for interrupt) can be handled as a NOP. However, BOOM should strive to be more efficient in how it handles WFI.
As a starting point, this signal from the CSR file is used to provide WFI support in Rocket (csr.io.csr_stall) by informing the Decode stage to stall:
https://github.com/ucb-bar/rocket-chip/blob/boom/src/main/scala/rocket/csr.scala#L506
Issue Analytics
- State:
- Created 7 years ago
- Reactions:3
- Comments:5 (3 by maintainers)
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Yes, the WFI is given to the CSRFile, since that is where external interrupts are managed. The CSRFile then asserts a
csr_stallsignal until it something happens. Thatcsr_stallsignal is then sent to the ROB and commit is blocked.https://github.com/ucb-bar/riscv-boom/commit/98c60153c6c49e15aeb5664d702755dd6295fc7d#diff-69f876ff27fd9890b973a8d95cadfc0eR480
This is now a part of the master branch.