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+ Eliminated need for save/load_regs, now the register save area is
behind a pointer which _slightly_ increases overall syscall delay, but
speeds up ipc requests by a fair bit.
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+ It really only works with Sv39, I suppose similar structures should be
added for Sv4} etc. if I ever get around to it.
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+ Both easier to look at and now the userspace doesn't play as big of a
role in the 'benchmarking' with optimizations turned on.
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+ Not strictly done yet, but we can swap between two processes :D
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+ Not actually working (at least fully), need to continue debugging when
I have time.
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+ Slightly unsure if it should be a syscall, or if assign would be
enough. Also, which thread should run in a fork/spawn? For now, old
thread, though this might increase latency. Or add swap flag to these
calls?
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+ Prefer over unixy fork/exec for speed since I don't want to support
cow. Shell redirection should be done with env server and cooperating
libc.
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+ Skip cow for now, maybe implement later but try to keep things simple.
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+ Multiple notify signals at the same time, or queued ones waiting for
ipc_req/fwd to finish would require a notify stack of some kind, which
is maybe too complex for my liking. Not impossible by any means, but I
want to keep things simple.
Let's say a client wants the server to do some async operation. First,
the client calls ipc_req to inform the server that it would like the
operation to be done. The server sets this task in some work queue or
whatever, and returns to the client as quickly as possible. Later on,
when the task is finished, the server does a ipc_req to the client,
with data about what was just finished. The client is responsible for
noting this data down somewhere, either reacting to the operation
directly in the callback, or calling ipc_notify to the thread that
requested the operation. Other possible notifications at the same time
should be handled at the same time, whichever way the client wants to
handle them.
Note that ipc_notify triggers only when the thread it targets is in
its base state, i.e. not doing an ipc_req. This makes things a bit
easier.
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+ Now to actually start implementing shit. :)
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+ In total, a syscall is built up of 6 values, with the first being the
syscall number. Symmetrically, the first value is now a status and the
following five values return "values". This allows us to cram in more
info into the ipc_* functions. The performance difference is
absolutely minimal, at least from my testing in qemu.
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+ Note that it is NOT intended for end user usage, just for debugging.
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+ Prepare for possibly testing rv32
+ Also remove newline from debugging output
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+ May warn about PHDR not being in LOAD, there is a flag to silence it
(--no-warn-rwx-segment) but it doesn't seem to exist in
riscv64-unknown-elf for some reason.
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+ Doesn't seem to be specified anywhere, but I'll stick with 2MB for
now, working on the assumption that the FW is at the start of the
physical RAM.
Possible TODOs: generate apos.its automatically from init.elf,
allocate root_branch statically?
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+ Does not mean documentation is done, but it's a nice little
achievement nonetheless.
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