1 files changed, 82 insertions, 0 deletions
diff --git a/riscv/sim.h b/riscv/sim.h
new file mode 100644
index 0000000..c4058d3
--- /dev/null
+++ b/riscv/sim.h
@@ -0,0 +1,82 @@
+#ifndef _RISCV_SIM_H
+#define _RISCV_SIM_H
+
+#include <vector>
+#include <string>
+#include "processor.h"
+#include "mmu.h"
+
+class htif_t;
+
+// this class encapsulates the processors and memory in a RISC-V machine.
+class sim_t
+{
+public:
+  sim_t(int _nprocs, htif_t* _htif);
+  ~sim_t();
+
+  // run the simulation to completion
+  void run(bool debug);
+
+  // communicate with the host machine
+  void set_tohost(reg_t val);
+  reg_t get_fromhost();
+
+  // deliver an IPI to a specific processor
+  void send_ipi(reg_t who);
+
+  // returns the number of processors in this simulator
+  size_t num_cores() { return procs.size(); }
+
+private:
+  htif_t* htif;
+
+  // global registers for communication with host machine
+  reg_t tohost;
+  reg_t fromhost;
+
+  // main memory, shared between processors
+  char* mem;
+  size_t memsz; // memory size in bytes
+  mmu_t* mmu; // debug port into main memory
+
+  // processors
+  std::vector<processor_t*> procs;
+
+  // terminate the simulation loop after the current iteration
+  void stop() { running = false; }
+  bool running;
+
+  // run each processor for n instructions; interleave instructions are
+  // run on a processor before moving on to the next processor.
+  // interleave must divide n.
+  // if noisy, print out the instructions as they execute.
+  void step_all(size_t n, size_t interleave, bool noisy);
+
+  // presents a prompt for introspection into the simulation
+  void interactive();
+
+  // functions that help implement interactive()
+  void interactive_quit(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_run(const std::string& cmd, const std::vector<std::string>& args, bool noisy);
+  void interactive_run_noisy(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_run_silent(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_run_proc(const std::string& cmd, const std::vector<std::string>& args, bool noisy);
+  void interactive_run_proc_noisy(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_run_proc_silent(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_reg(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_fregs(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_fregd(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_mem(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_str(const std::string& cmd, const std::vector<std::string>& args);
+  void interactive_until(const std::string& cmd, const std::vector<std::string>& args);
+  reg_t get_reg(const std::vector<std::string>& args);
+  reg_t get_freg(const std::vector<std::string>& args);
+  reg_t get_mem(const std::vector<std::string>& args);
+  reg_t get_pc(const std::vector<std::string>& args);
+  reg_t get_tohost(const std::vector<std::string>& args);
+
+  friend class htif_t;
+};
+
+#endif