64 lines
2.1 KiB
Rust
64 lines
2.1 KiB
Rust
#[cfg(feature = "executor-interrupt")]
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compile_error!("`executor-interrupt` is not supported with `arch-riscv32`.");
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#[cfg(feature = "thread-context")]
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compile_error!("`thread-context` is not supported with `arch-riscv32`.");
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#[cfg(feature = "executor-thread")]
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pub use thread::*;
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#[cfg(feature = "executor-thread")]
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mod thread {
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use core::marker::PhantomData;
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use core::sync::atomic::{AtomicBool, Ordering};
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#[cfg(feature = "nightly")]
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pub use embassy_macros::main_riscv as main;
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use crate::raw::OpaqueThreadContext;
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use crate::thread::ThreadContext;
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/// global atomic used to keep track of whether there is work to do since sev() is not available on RISCV
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static SIGNAL_WORK_THREAD_MODE: AtomicBool = AtomicBool::new(false);
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#[export_name = "__thread_mode_pender"]
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fn __thread_mode_pender(_core_id: OpaqueThreadContext) {
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SIGNAL_WORK_THREAD_MODE.store(true, Ordering::SeqCst);
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}
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/// TODO
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// Name pending
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#[derive(Default)] // Default enables Executor::new
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pub struct RiscVThreadContext {
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_not_send: PhantomData<*mut ()>,
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}
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impl ThreadContext for RiscVThreadContext {
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fn context(&self) -> OpaqueThreadContext {
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OpaqueThreadContext(())
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}
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fn wait(&mut self) {
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// We do not care about race conditions between the load and store operations,
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// interrupts will only set this value to true.
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critical_section::with(|_| {
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// if there is work to do, loop back to polling
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// TODO can we relax this?
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if SIGNAL_WORK_THREAD_MODE.load(Ordering::SeqCst) {
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SIGNAL_WORK_THREAD_MODE.store(false, Ordering::SeqCst);
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}
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// if not, wait for interrupt
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else {
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unsafe {
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core::arch::asm!("wfi");
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}
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}
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});
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// if an interrupt occurred while waiting, it will be serviced here
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}
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}
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/// TODO
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// Type alias for backwards compatibility
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pub type Executor = crate::thread::ThreadModeExecutor<RiscVThreadContext>;
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}
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