Initial commit

kernel/core/irq.c

@@ -0,0 +1,16 @@
+#include <kernel/irq.h>
+#include <kernel/percpu.h>
+#include <stdatomic.h>
+
+void irq_lock() {
+    irq_set_state(false);
+    atomic_fetch_add_explicit(&percpu_get()->irq.level, 1, memory_order_acq_rel);
+}
+
+void irq_unlock() {
+    uint32_t old_level = atomic_fetch_sub_explicit(&percpu_get()->irq.level, 1, memory_order_acq_rel);
+    // If it was 1, the new IRQ level is now 0.
+    if (old_level == 1) {
+        irq_set_state(true);
+    }
+}