From f582a36e4df16d5709943f7df17a900c8bcc12ab Mon Sep 17 00:00:00 2001
From: Kevin O'Connor <kevin@koconnor.net>
Date: Wed, 25 May 2016 11:37:40 -0400
Subject: Initial commit of source code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
---
 src/avr/irq.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 src/avr/irq.h

(limited to 'src/avr/irq.h')

diff --git a/src/avr/irq.h b/src/avr/irq.h
new file mode 100644
index 00000000..bfc6cb51
--- /dev/null
+++ b/src/avr/irq.h
@@ -0,0 +1,29 @@
+#ifndef __AVR_IRQ_H
+#define __AVR_IRQ_H
+// Definitions for irq enable/disable on AVR
+
+#include <avr/interrupt.h> // cli
+#include "compiler.h" // barrier
+
+static inline void irq_disable(void) {
+    cli();
+    barrier();
+}
+
+static inline void irq_enable(void) {
+    barrier();
+    sei();
+}
+
+static inline uint8_t irq_save(void) {
+    uint8_t flag = SREG;
+    irq_disable();
+    return flag;
+}
+
+static inline void irq_restore(uint8_t flag) {
+    barrier();
+    SREG = flag;
+}
+
+#endif // irq.h
-- 
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