Ensure long irs sequencer_tick can be interrupted

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gba/gba.h b/src/gba/gba.h
index 3f629fd..1bb3afd 100644
--- a/src/gba/gba.h
+++ b/src/gba/gba.h
@@ -534,6 +534,14 @@ void irs_set(IrqIndex idx, IrsFunc func);
 // assembly and enable interrupts.
 void irq_init(void);
 
+// Only should be used inside an IrsFunc to enable it being interrupted by the
+// given interrupt (nested IRS).
+static inline void
+irs_interruptible(IrqIndex idx) {
+    IRQ_ENABLE |= (1 << idx);
+    IRQ_CTRL = 1;
+}
+
 //
 // BIOS function declarations.
 //