core: hle: kernel: Implement thread pinning.

- We largely had the mechanics in place for thread pinning, this change hooks these up.
- Validated with tests https://github.com/Atmosphere-NX/Atmosphere/blob/master/tests/TestSvc/source/test_thread_pinning.cpp.

1 files changed, 34 insertions, 0 deletions

diff --git a/src/core/hle/kernel/k_interrupt_manager.cpp b/src/core/hle/kernel/k_interrupt_manager.cpp
new file mode 100644
index 0000000000..e5dd39751a
--- /dev/null
+++ b/src/core/hle/kernel/k_interrupt_manager.cpp
@@ -0,0 +1,34 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/hle/kernel/k_interrupt_manager.h"
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/k_scheduler.h"
+#include "core/hle/kernel/k_thread.h"
+#include "core/hle/kernel/kernel.h"
+
+namespace Kernel::KInterruptManager {
+
+void HandleInterrupt(KernelCore& kernel, s32 core_id) {
+    auto* process = kernel.CurrentProcess();
+    if (!process) {
+        return;
+    }
+
+    auto& scheduler = kernel.Scheduler(core_id);
+    auto& current_thread = *scheduler.GetCurrentThread();
+
+    // If the user disable count is set, we may need to pin the current thread.
+    if (current_thread.GetUserDisableCount() && !process->GetPinnedThread(core_id)) {
+        KScopedSchedulerLock sl{kernel};
+
+        // Pin the current thread.
+        process->PinCurrentThread(core_id);
+
+        // Set the interrupt flag for the thread.
+        scheduler.GetCurrentThread()->SetInterruptFlag();
+    }
+}
+
+} // namespace Kernel::KInterruptManager