1463: Allow for an optional user-defined entry macro when targeting RISC-V r=Dirbaio a=jessebraham
In [esp-hal](https://github.com/esp-rs/esp-hal) we use our own custom runtime crate, [esp-riscv-rt](https://github.com/esp-rs/esp-riscv-rt). This PR adds the ability to optionally specify an entry macro when using `embassy_executor::main`. The following forms are both accepted:
```rust
#[embassy_executor::main] // uses `riscv_rt::entry` by default
async fn main() {}
#[embassy_executor::main(entry = "esp_riscv_rt::entry")]
async fn main() {}
```
I attempted to get this working without needing to quote the entry macro argument, however I was not able to get this working. Based off some reading I did this may not be possible, however I am rather inexperienced with proc macros. Happy to change this if anybody has any insight.
Co-authored-by: Jesse Braham <jesse@beta7.io>
1465: rp: continue clock rework r=Dirbaio a=pennae
vastly reduce the code size of initial clock config (over 700 bytes saved!), at the cost of about 48 bytes of ram used to store the frequencies of all clocks in the system. also stop exporting unstable pac items for clock config, fix a few settings that were out of spec, and add missing features (most notably gpin source information).
Co-authored-by: pennae <github@quasiparticle.net>
gpin clock sources aren't going to be very useful during cold boot and
thus require runtime clock reconfig. once we get there we can use this
for reference. or maybe we can't, only time will tell.
we'll take static ownership of an entire pin (not just a limited
reference), otherwise we cannot at all guarantee that the pin will not
be reused for something else while still in use. in theory we could
limit the liftime of this use, but that would require attaching
lifetimes to ClockConfig (and subsequently the main config), passing
those through init(), and returning an object that undoes the gpin
configuration on drop. that's a lot unnecessary support code while we
don't have runtime clock reconfig.
don't recalculate clock frequencies every time they are asked for. while
this is not very often in practice it does consume a bunch of flash
space that cannot be optimized away, and was pulled in unconditionally
previously. while we technically only need the configured rosc, xosc and
gpin frequencies it is easier to store all frequencies (and much cheaper
at runtime too).
if rosc really does run at 140MHz in high at div=1 then these values
were not correct and would've exceeded the chip spec. the HIL test
device seems to run fast (150MHz) so they're still not quite correct,
but rosc has high variance anyway so it's probably fine.
exposing pac items kind of undermines the unstable-pac feature. directly
exposing register structure is also pretty inconvenient since the clock
switching code takes care of the src/aux difference in behavior, so a
user needn't really be forced to write down decomposed register values.
the datasheet says that the xosc may be run by feeding a square wave
into the XIN pin of the chip, but requires that the oscillator be set to
pass through XIN in that case. it does not mention how, the xosc
peripheral does not seem to have any config bits that could be set to
this effect, and pico-sdk seems to have no (or at least no special)
handling for this configuration at all. it can thus be assumed to either
be not supported even by the reference sdk or to not need different
handling.
solvers usually output fbdiv directly, using vco_freq to get back to
fbdiv is not all that necessary or useful. both vco_freq and fbdiv have
hidden constraints, but vco_freq is a lot less accurate because the
fbdiv value resulting from the division may be off by almost a full
ref_freq's worth of frequency.
also fixes the usb pll config, which ran the pll vco way out of (below)
spec.
we might not configure both, so we should put the others into reset
state. leaving them fully as is might leave them running, which might
not be the goal for runtime reconfig (when it comes around). this now
mirrors how we reset all clock-using peripherals and only unreset those
that are properly clocked.
this is only really useful for runtime *re*configuration, which we don't
currently support. even runtime reconfig probably won't need it, unless
we keep taking the sledgehammer approach of reconfiguring everything all
the time.
1459: rp/multicore: fix undefined behavior in multicore spawn. r=Dirbaio a=Dirbaio
It is UB to pass `entry` to core1 as `&mut`, because core0 keeps an aliasing pointer to that memory region, and actually writes to it (when `spawn_core1` returns, the stack frame gets deallocated and the memory gets reused). This violates noalias requirements.
Added the fence just in case, een though it works without.
bors r+
Co-authored-by: Dario Nieuwenhuis <dirbaio@dirbaio.net>
It is UB to pass `entry` to core1 as `&mut`, because core0 keeps
an aliasing pointer to that memory region, and actually writes to
it (when `spawn_core1` returns, the stack frame gets deallocated and the memory
gets reused). This violates noalias requirements.
Added the fence just in case, een though it works without.
1458: rp: remove take!, add bind_interrupts! r=Dirbaio a=pennae
both of the uart interrupts now check a flag that only the dma rx path ever sets (and now unsets again on drop) to return early if it's not as they expect. this is ... not our preferred solution, but if bind_interrupts *must* allow mutiple handlers to be specified then this is the only way we can think of that doesn't break uarts.
Co-authored-by: pennae <github@quasiparticle.net>
1456: net: do not use smoltcp Instant/Duration in public API, docs. r=Dirbaio a=Dirbaio
bors r+
Co-authored-by: Dario Nieuwenhuis <dirbaio@dirbaio.net>
1451: Work around xtensa deadlock, take 2 r=Dirbaio a=bugadani
This PR is another go at trying to do something with #1449. The commit was part of the previous attempt but mistakenly discarded as I still experienced lockups. However, after further testing, it looks like that lockup is caused by something else.
This is a manual, "cpu-local" critical section impl that should be good enough on dual-core CPUs, although the implementation still contains `SIGNAL_WORK_THREAD_MODE` which is absolutely not correct on dual-core. This approach was chosen because:
- not taking the global lock technically allows the second core to run
- wrapping the signal read and the sleep in a critical section prevents a race condition that would cause the CPU to sleep longer than ideal if an interrupt hits after reading, but before sleeping.
Co-authored-by: Dániel Buga <bugadani@gmail.com>
1454: stm32f0 flash implementation r=Dirbaio a=jp99
i've copied and modified the f3 implementation and it seems to be working.
Co-authored-by: Jaap Prickartz <jaap@tetra.nl>
