diff --git a/firmware/inc/isr.h b/firmware/inc/isr.h
new file mode 100644
index 0000000..c1e95d6
--- /dev/null
+++ b/firmware/inc/isr.h
@@ -0,0 +1,51 @@
+#ifndef __ISR_H
+#define __ISR_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <cpu.h>
+#include <list.h>
+#include <util.h>
+
+struct ChainedInterrupt {
+    link_t isrs;
+
+    void (*const enable)(struct ChainedInterrupt *);
+    void (*const disable)(struct ChainedInterrupt *);
+};
+
+struct ChainedIsr {
+    link_t node;
+    bool (*const func)(struct ChainedIsr *);
+};
+
+static inline void chainIsr(struct ChainedInterrupt *interrupt, struct ChainedIsr *isr)
+{
+    interrupt->disable(interrupt);
+    list_add_tail(&interrupt->isrs, &isr->node);
+    interrupt->enable(interrupt);
+}
+
+static inline void unchainIsr(struct ChainedInterrupt *interrupt, struct ChainedIsr *isr)
+{
+    interrupt->disable(interrupt);
+    list_delete(&isr->node);
+    if (!list_is_empty(&interrupt->isrs))
+        interrupt->enable(interrupt);
+}
+
+static inline bool dispatchIsr(struct ChainedInterrupt *interrupt)
+{
+    struct link_t *cur, *tmp;
+    bool handled = false;
+
+    list_iterate(&interrupt->isrs, cur, tmp) {
+        struct ChainedIsr *curIsr = container_of(cur, struct ChainedIsr, node);
+        handled = handled || curIsr->func(curIsr);
+    }
+
+    return handled;
+}
+
+#endif /* __ISR_H */