| commit | 3e19bde3c8f623da5f2ee7a96203419eac4a400a | [log] [tgz] |
|---|---|---|
| author | Philipp Wagner <phw@lowrisc.org> | Thu Jul 22 19:05:01 2021 +0100 |
| committer | Philipp Wagner <mail@philipp-wagner.com> | Fri Aug 27 11:44:27 2021 +0200 |
| tree | 2a961748bc614b864091b62d8dfcf123c710e8b0 | |
| parent | bef0c8c3168a67265ee7ab1a9f36b7105fe4134b [diff] |
[otbn] Operational states and commands Specify the operational states OTBN can be in. - Consolidate all user (host-software) initiated actions into the CMD register. To keep things simple, I resorted to allowing only a single command being executed at any time, and in consequence encoding the command as number, not as bitfield. This also means that performing a secure wipe of IMEM and DMEM now requires two host-initiated actions. (Nobody ever asked explicitly for them being a single operation.) The CMD register is 8 bit wide to make multi-bit encodings and extensions of the commands easier going forward. - Expand the STATUS register to show what's currently going on within OTBN: mirror all CMDs in the status register. The STATUS register is 8 bit wide to make it easier to extend going forward. We already plan to have a LOCKED status. Update all users of the registers: - Update all software to make use of the new CMD and STATUS registers. - Update otbnsim to make use of the new registers. Refactor the err_bits module to hold other constants as well. - Update DV to make use of the new registers. Fixes #7434 Signed-off-by: Philipp Wagner <phw@lowrisc.org>
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