Add an abstract interrupt controller interface

We add an abstract interrupt controller interface which can be used by
devices to trigger wired interrupts.

Signed-off-by: Anup Patel <anup@brainfault.org>

riscv/abstract_interrupt_controller.h

@@ -0,0 +1,14 @@
+#ifndef _RISCV_ABSTRACT_INTERRUPT_CONTROLLER_H
+#define _RISCV_ABSTRACT_INTERRUPT_CONTROLLER_H
+
+#include "decode.h"
+#include <cstdint>
+#include <cstddef>
+
+class abstract_interrupt_controller_t {
+ public:
+  virtual void set_interrupt_level(uint32_t interrupt_id, int level) = 0;
+  virtual ~abstract_interrupt_controller_t() {}
+};
+
+#endif

riscv/devices.h

@@ -4,6 +4,7 @@
 #include "decode.h"
 #include "mmio_plugin.h"
 #include "abstract_device.h"
+#include "abstract_interrupt_controller.h"
 #include "platform.h"
 #include <map>
 #include <vector>