Re: [PATCH] Add direct memory access synchronize extension


Nick Kossifidis
 

Στις 2021-06-07 07:03, Anup Patel έγραψε:
Let's have a simple SBI DMA sync extension in SBI v0.4 spec.
The shared code pages between M-mode and S-mode will have it's own
Challenges and we will have to define more stuff in SBI spec to support
this (see above).
Totally agree with you, I just thought it'd be a good opportunity to bring this up so that we can discuss it at some point, let's have something that works and we can optimize it later on.

It seems CMO extension might freeze sooner than we think (others can
comment on this). If CMO extension is frozen by year end then we can
trap-n-emulate CMO instructions instead of SBI DMA sync extension. If
it does not freeze by year end then we will have to go ahead with
SBI DMA sync extension as stop-gap solution.
The CMOs TG has a meeting today, I'll try and join and ask for updates on this.

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