Initial commit of source code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/simulator/irq.h

@@ -0,0 +1,31 @@
+#ifndef __SIMU_IRQ_H
+#define __SIMU_IRQ_H
+// Definitions for irq enable/disable on host simulator
+
+#include <stdint.h>
+#include "compiler.h" // barrier
+
+extern uint8_t Interrupt_off;
+
+static inline void irq_disable(void) {
+    Interrupt_off = 1;
+    barrier();
+}
+
+static inline void irq_enable(void) {
+    barrier();
+    Interrupt_off = 0;
+}
+
+static inline uint8_t irq_save(void) {
+    uint8_t flag = Interrupt_off;
+    irq_disable();
+    return flag;
+}
+
+static inline void irq_restore(uint8_t flag) {
+    barrier();
+    Interrupt_off = flag;
+}
+
+#endif // irq.h