generic: Move simulator/irq.h to new file generic/irq.h

Move the generic irq definitions into generic/irq.h and move the
simulator irq code into main.c.

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

src/simulator/main.c

@@ -7,10 +7,42 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <unistd.h>
+#include "board/misc.h" // timer_from_us
+#include "board/irq.h" // irq_disable
 #include "sched.h" // sched_main
 
+
+/****************************************************************
+ * Interrupts
+ ****************************************************************/
+
 uint8_t Interrupt_off;
 
+void irq_disable(void)
+{
+    Interrupt_off = 1;
+    barrier();
+}
+
+void irq_enable(void)
+{
+    barrier();
+    Interrupt_off = 0;
+}
+
+uint8_t irq_save(void)
+{
+    uint8_t flag = Interrupt_off;
+    irq_disable();
+    return flag;
+}
+
+void irq_restore(uint8_t flag)
+{
+    barrier();
+    Interrupt_off = flag;
+}
+
 
 /****************************************************************
  * Timers