have to absorb a version change due to xous-semver change
might as well also update the utra/svd generator dependencies
since that's been held off for a long time now.
This is the weirdest damn thing. All the crates say 0.4.19 as
the chrono version, but the actual version in the lockfile
is 0.4.33. And there isn't an error about it?
Anyways, this update the pins to reflect what's in the lockfile.
The nominal purpose of this is to allow other services to delay
interactions that could interfere with an EC update.
Note that anyone could call this routine and mark the EC as not
ready, since the llio block is not secured and the API is public.
I don't think it's a security problem, but is a DoS vector.
Wait until after the struct is created. This will cause it to be placed
in a fixed address, which works around an issue that appeared in 1.71.0.
Signed-off-by: Sean Cross <sean@xobs.io>
- make the "base" field no longer public. It is accessible, but only
through an `unsafe` method, because, it is unsafe.
- add accessors to offest/mask fields. Because, it's not at all
unsafe to access these, and it can be useful for bit-ops that are
not part of the generic set of UTRA.
- add Arc to AtomicCSR, and require `std` for AtomicCSR types.
This should not break anything, I checked inside @foundation-devices
keyOS and they don't seem to be using AtomicCSR anywhere.
The Arc makes it a bit safer to clone the AtomicCSR base pointer
and share it between threads, but it will have an impact on performance.
The USB stack (which requires AtomicCSR) was regression testing and the
impact seems minimal.
Recall that the main purpose of AtomicCSR is to provide a CSR accessor
that does not require a mutable reference to the base object. This
can make certain Rust idioms a bit cleaner. We wrap the base accessor
in Arc+Atomic to try and improve the safety of throwing the borrow
checker under the bus, but it's still not perfect because hardware
mutable state can have side-effects within hardware itself that cannot
be modeled or checked by Rust's borrow checker.
