Remove the shim kernel crate

kernel/src/time/softirq.rs

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use alloc::{boxed::Box, vec::Vec};
+
+use ostd::{arch::timer, sync::RwLock, trap::SoftIrqLine};
+
+use crate::softirq_id::TIMER_SOFTIRQ_ID;
+
+static TIMER_SOFTIRQ_CALLBACKS: RwLock<Vec<Box<dyn Fn() + Sync + Send>>> = RwLock::new(Vec::new());
+
+pub(super) fn init() {
+    SoftIrqLine::get(TIMER_SOFTIRQ_ID).enable(timer_softirq_handler);
+
+    timer::register_callback(|| {
+        SoftIrqLine::get(TIMER_SOFTIRQ_ID).raise();
+    });
+}
+
+/// Registers a function that will be executed during timer softirq.
+pub(super) fn register_callback<F>(func: F)
+where
+    F: Fn() + Sync + Send + 'static,
+{
+    TIMER_SOFTIRQ_CALLBACKS
+        .write_irq_disabled()
+        .push(Box::new(func));
+}
+
+fn timer_softirq_handler() {
+    let callbacks = TIMER_SOFTIRQ_CALLBACKS.read_irq_disabled();
+    for callback in callbacks.iter() {
+        (callback)();
+    }
+}