fix(core_local): put scheduler in RefCell

Signed-off-by: Martin Kröning <[email protected]>

src/arch/aarch64/kernel/core_local.rs

@@ -1,7 +1,7 @@
 use alloc::boxed::Box;
 use alloc::vec::Vec;
 use core::arch::asm;
-use core::cell::{Cell, RefCell, RefMut};
+use core::cell::{RefCell, RefMut};
 use core::ptr;
 use core::sync::atomic::Ordering;
 
@@ -20,7 +20,7 @@ pub(crate) struct CoreLocal {
 	/// ID of the current Core.
 	core_id: CoreId,
 	/// Scheduler of the current Core.
-	scheduler: Cell<*mut PerCoreScheduler>,
+	scheduler: RefCell<Option<PerCoreScheduler>>,
 	/// Interface to the interrupt counters
 	irq_statistics: &'static IrqStatistics,
 	/// Queue of async tasks
@@ -44,7 +44,7 @@ impl CoreLocal {
 		let this = Self {
 			this: ptr::null_mut(),
 			core_id,
-			scheduler: Cell::new(ptr::null_mut()),
+			scheduler: RefCell::new(None),
 			irq_statistics,
 			async_tasks: RefCell::new(Vec::new()),
 			#[cfg(feature = "smp")]
@@ -91,17 +91,18 @@ pub(crate) fn core_id() -> CoreId {
 	}
 }
 
-#[inline]
-pub(crate) fn core_scheduler() -> &'static mut PerCoreScheduler {
-	unsafe { &mut *CoreLocal::get().scheduler.get() }
+pub(crate) fn core_scheduler() -> RefMut<'static, PerCoreScheduler> {
+	RefMut::map(CoreLocal::get().scheduler.borrow_mut(), |scheduler| {
+		scheduler.as_mut().unwrap()
+	})
 }
 
 pub(crate) fn async_tasks() -> RefMut<'static, Vec<AsyncTask>> {
 	CoreLocal::get().async_tasks.borrow_mut()
 }
 
-pub(crate) fn set_core_scheduler(scheduler: *mut PerCoreScheduler) {
-	CoreLocal::get().scheduler.set(scheduler);
+pub(crate) fn set_core_scheduler(scheduler: PerCoreScheduler) {
+	*CoreLocal::get().scheduler.borrow_mut() = Some(scheduler);
 }
 
 pub(crate) fn increment_irq_counter(irq_no: u8) {

src/arch/x86_64/kernel/apic.rs

@@ -225,9 +225,11 @@ extern "x86-interrupt" fn spurious_interrupt_handler(stack_frame: interrupts::Ex
 
 #[cfg(feature = "smp")]
 extern "x86-interrupt" fn wakeup_handler(_stack_frame: interrupts::ExceptionStackFrame) {
+	use crate::scheduler::PerCoreSchedulerExt;
+
 	debug!("Received Wakeup Interrupt");
 	increment_irq_counter(WAKEUP_INTERRUPT_NUMBER);
-	let core_scheduler = core_scheduler();
+	let mut core_scheduler = core_scheduler();
 	core_scheduler.check_input();
 	eoi();
 	if core_scheduler.is_scheduling() {

src/arch/x86_64/kernel/core_local.rs

@@ -24,7 +24,7 @@ pub(crate) struct CoreLocal {
 	/// Sequential ID of this CPU Core.
 	core_id: CoreId,
 	/// Scheduler for this CPU Core.
-	scheduler: Cell<*mut PerCoreScheduler>,
+	scheduler: RefCell<Option<PerCoreScheduler>>,
 	/// Task State Segment (TSS) allocated for this CPU Core.
 	pub tss: Cell<*mut TaskStateSegment>,
 	/// start address of the kernel stack
@@ -54,7 +54,7 @@ impl CoreLocal {
 		let this = Self {
 			this: ptr::null_mut(),
 			core_id,
-			scheduler: Cell::new(ptr::null_mut()),
+			scheduler: RefCell::new(None),
 			tss: Cell::new(ptr::null_mut()),
 			kernel_stack: Cell::new(0),
 			irq_statistics,
@@ -101,16 +101,18 @@ pub(crate) fn core_id() -> CoreId {
 	}
 }
 
-pub(crate) fn core_scheduler() -> &'static mut PerCoreScheduler {
-	unsafe { &mut *CoreLocal::get().scheduler.get() }
+pub(crate) fn core_scheduler() -> RefMut<'static, PerCoreScheduler> {
+	RefMut::map(CoreLocal::get().scheduler.borrow_mut(), |scheduler| {
+		scheduler.as_mut().unwrap()
+	})
 }
 
 pub(crate) fn async_tasks() -> RefMut<'static, Vec<AsyncTask>> {
 	CoreLocal::get().async_tasks.borrow_mut()
 }
 
-pub(crate) fn set_core_scheduler(scheduler: *mut PerCoreScheduler) {
-	CoreLocal::get().scheduler.set(scheduler);
+pub(crate) fn set_core_scheduler(scheduler: PerCoreScheduler) {
+	*CoreLocal::get().scheduler.borrow_mut() = Some(scheduler);
 }
 
 pub(crate) fn increment_irq_counter(irq_no: u8) {

src/arch/x86_64/kernel/scheduler.rs

@@ -16,6 +16,7 @@ use crate::arch::x86_64::mm::{PhysAddr, VirtAddr};
 use crate::config::*;
 use crate::kernel;
 use crate::scheduler::task::{Task, TaskFrame};
+use crate::scheduler::PerCoreSchedulerExt;
 
 #[repr(C, packed)]
 struct State {

src/drivers/net/mod.rs

@@ -70,6 +70,8 @@ pub(crate) fn network_irqhandler(_state: &State) -> bool {
 
 #[cfg(target_arch = "x86_64")]
 pub(crate) extern "x86-interrupt" fn network_irqhandler(_stack_frame: ExceptionStackFrame) {
+	use crate::scheduler::PerCoreSchedulerExt;
+
 	debug!("Receive network interrupt");
 	apic::eoi();
 	let _ = _irqhandler();

src/lib.rs

@@ -56,6 +56,7 @@ use mm::allocator::LockedAllocator;
 pub(crate) use crate::arch::*;
 pub(crate) use crate::config::*;
 use crate::kernel::is_uhyve_with_pci;
+use crate::scheduler::{PerCoreScheduler, PerCoreSchedulerExt};
 pub use crate::syscalls::*;
 
 #[macro_use]
@@ -342,9 +343,8 @@ fn boot_processor_main() -> ! {
 	// Start the initd task.
 	scheduler::PerCoreScheduler::spawn(initd, 0, scheduler::task::NORMAL_PRIO, 0, USER_STACK_SIZE);
 
-	let core_scheduler = core_scheduler();
 	// Run the scheduler loop.
-	core_scheduler.run();
+	PerCoreScheduler::run();
 }
 
 /// Entry Point of HermitCore for an Application Processor
@@ -358,9 +358,8 @@ fn application_processor_main() -> ! {
 	synch_all_cores();
 	crate::executor::init();
 
-	let core_scheduler = core_scheduler();
 	// Run the scheduler loop.
-	core_scheduler.run();
+	PerCoreScheduler::run();
 }
 
 #[cfg(target_os = "none")]