- use proper seeding of entire state
- chacha8 does not evolve internal state when extracting the seed,
so we have to run the cipher some to force mixing of the seed
state.
lots of terrible stuff going on, nothing tested, but we have
a baseline of whatever they put in C directly forced into Rust.
A lot of really naughty things going on with raw pointers in this
driver -- it's going to be a challenge to oxidize.
The loader bringup now has some IRQ testing built into it.
Couldn't actually get an IRQ to trigger, but it has to do something
more with me not getting the RV IRQ machine bits configured right
than anything else. However, the stub is useful for confirming
which IRQ bits actually fire on the UDMA UART implementation,
which is the big point. There's an ambiguity in the wiring
of the UDMA block which isn't explained at all, which is the
fact that there's an RX interrupt and an RX_CHAR interrupt.
I still don't know what RX_CHAR does, but the RX interrupt
does fire when a character is received, so that's the one
we're going to use.
not quite sure why it is even there, might just be a thing from
really old code we never removed. Removing this allows us to
specify pointer types to non-copy elements, making Rust do
the hard work of figuring out how big of a block we need to zero.
some errors were made in clearing memory because we weren't
using the Rust type system to our advantage. This cleans up
the phase 1 loader to use the native types of the block plus
the slice length we intend to create to block-zero the correct
region size.
also simplify mem::size_of to size_of
because the print! macro becomes a dummy when debug printing is
off, we get a bunch of warnings about unused variables because
the print! arguments aren't used. Add _ before variable names
to quiet these warnings.
