Implement RoCC and add a dummy RoCC

Enable it with --extension=dummy

1 files changed, 33 insertions, 0 deletions

diff --git a/riscv/extension.h b/riscv/extension.h
new file mode 100644
index 0000000..218deb4
--- /dev/null
+++ b/riscv/extension.h
@@ -0,0 +1,33 @@
+#ifndef _RISCV_COPROCESSOR_H
+#define _RISCV_COPROCESSOR_H
+
+#include "processor.h"
+#include <map>
+#include <string>
+#include <vector>
+#include <functional>
+
+class extension_t
+{
+ public:
+  virtual std::vector<insn_desc_t> get_instructions() = 0;
+  virtual const char* name() = 0;
+  virtual ~extension_t();
+
+  void set_processor(processor_t* _p) { p = _p; }
+ protected:
+  processor_t* p;
+
+  void illegal_instruction();
+  void raise_interrupt();
+  void clear_interrupt();
+};
+
+std::map<std::string, std::function<extension_t*()>>& extensions();
+
+#define REGISTER_EXTENSION(name, constructor) \
+  class register_##name { \
+    public: register_##name() { extensions()[#name] = constructor; } \
+  }; static register_##name dummy_##name;
+
+#endif