1 files changed, 51 insertions, 0 deletions
diff --git a/src/kernel/HALKit/AMD64/HalSchedulerCorePrimitives.cc b/src/kernel/HALKit/AMD64/HalSchedulerCorePrimitives.cc
new file mode 100644
index 00000000..44ec2a37
--- /dev/null
+++ b/src/kernel/HALKit/AMD64/HalSchedulerCorePrimitives.cc
@@ -0,0 +1,51 @@
+/* ========================================
+
+  Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
+
+======================================== */
+
+#include <HALKit/AMD64/Processor.h>
+#include <KernelKit/ProcessScheduler.h>
+
+namespace Kernel {
+/***********************************************************************************/
+/// @brief Unimplemented function (crashes by default)
+/// @param
+/***********************************************************************************/
+
+EXTERN_C Void __ne_pure_call(USER_PROCESS* process) {
+  if (process) process->Crash();
+}
+
+/***********************************************************************************/
+/// @brief Validate user stack.
+/// @param stack_ptr the frame pointer.
+/***********************************************************************************/
+
+EXTERN_C Bool hal_check_task(HAL::StackFramePtr stack_ptr) {
+  if (!stack_ptr) return No;
+
+  return stack_ptr->SP > 0 && stack_ptr->IP > 0;
+}
+
+/// @brief Wakes up thread.
+/// Wakes up thread from the hang state.
+Void mp_wakeup_thread(HAL::StackFrame* stack) {
+  if (!hal_check_task(stack)) return;
+
+  // RIP is always in R15. R15 is reserved for the RIP.
+  stack->IP = stack->R15;
+
+  Kernel::UserProcessHelper::StartScheduling();
+}
+
+/// @brief makes the thread sleep on a loop.
+/// hooks and hangs thread to prevent code from executing.
+Void mp_hang_thread(HAL::StackFrame* stack) {
+  if (!hal_check_task(stack)) return;
+
+  // Store IP in R15
+  stack->R15 = stack->IP;
+  stack->IP  = 0UL;
+}
+}  // namespace Kernel