riscv/sim.h

   1 // See LICENSE for license details.
   2
   3 #ifndef _RISCV_SIM_H
   4 #define _RISCV_SIM_H
   5
   6 #include "processor.h"
   7 #include "devices.h"
   8 #include "debug_module.h"
   9 #include <fesvr/htif.h>
  10 #include <fesvr/context.h>
  11 #include <vector>
  12 #include <string>
  13 #include <memory>
  14
  15 class mmu_t;
  16 class remote_bitbang_t;
  17
  18 // this class encapsulates the processors and memory in a RISC-V machine.
  19 class sim_t : public htif_t
  20 {
  21 public:
  22   sim_t(const char* isa, size_t _nprocs,  bool halted, reg_t start_pc,
  23         std::vector<std::pair<reg_t, mem_t*>> mems,
  24         const std::vector<std::string>& args);
  25   ~sim_t();
  26
  27   // run the simulation to completion
  28   int run();
  29   void set_debug(bool value);
  30   void set_log(bool value);
  31   void set_histogram(bool value);
  32   void set_procs_debug(bool value);
  33   void set_remote_bitbang(remote_bitbang_t* remote_bitbang) {
  34     this->remote_bitbang = remote_bitbang;
  35   }
  36   const char* get_dts() { if (dts.empty()) reset(); return dts.c_str(); }
  37   processor_t* get_core(size_t i) { return procs.at(i); }
  38   unsigned nprocs() const { return procs.size(); }
  39
  40   debug_module_t debug_module;
  41
  42 private:
  43   std::vector<std::pair<reg_t, mem_t*>> mems;
  44   mmu_t* debug_mmu;  // debug port into main memory
  45   std::vector<processor_t*> procs;
  46   reg_t start_pc;
  47   std::string dts;
  48   std::unique_ptr<rom_device_t> boot_rom;
  49   std::unique_ptr<clint_t> clint;
  50   bus_t bus;
  51
  52   processor_t* get_core(const std::string& i);
  53   void step(size_t n); // step through simulation
  54   static const size_t INTERLEAVE = 5000;
  55   static const size_t INSNS_PER_RTC_TICK = 100; // 10 MHz clock for 1 BIPS core
  56   static const size_t CPU_HZ = 1000000000; // 1GHz CPU
  57   size_t current_step;
  58   size_t current_proc;
  59   bool debug;
  60   bool log;
  61   bool histogram_enabled; // provide a histogram of PCs
  62   remote_bitbang_t* remote_bitbang;
  63
  64   // memory-mapped I/O routines
  65   char* addr_to_mem(reg_t addr);
  66   bool mmio_load(reg_t addr, size_t len, uint8_t* bytes);
  67   bool mmio_store(reg_t addr, size_t len, const uint8_t* bytes);
  68   void make_dtb();
  69
  70   // presents a prompt for introspection into the simulation
  71   void interactive();
  72
  73   // functions that help implement interactive()
  74   void interactive_help(const std::string& cmd, const std::vector<std::string>& args);
  75   void interactive_quit(const std::string& cmd, const std::vector<std::string>& args);
  76   void interactive_run(const std::string& cmd, const std::vector<std::string>& args, bool noisy);
  77   void interactive_run_noisy(const std::string& cmd, const std::vector<std::string>& args);
  78   void interactive_run_silent(const std::string& cmd, const std::vector<std::string>& args);
  79   void interactive_reg(const std::string& cmd, const std::vector<std::string>& args);
  80   void interactive_freg(const std::string& cmd, const std::vector<std::string>& args);
  81   void interactive_fregs(const std::string& cmd, const std::vector<std::string>& args);
  82   void interactive_fregd(const std::string& cmd, const std::vector<std::string>& args);
  83   void interactive_pc(const std::string& cmd, const std::vector<std::string>& args);
  84   void interactive_mem(const std::string& cmd, const std::vector<std::string>& args);
  85   void interactive_str(const std::string& cmd, const std::vector<std::string>& args);
  86   void interactive_until(const std::string& cmd, const std::vector<std::string>& args);
  87   reg_t get_reg(const std::vector<std::string>& args);
  88   freg_t get_freg(const std::vector<std::string>& args);
  89   reg_t get_mem(const std::vector<std::string>& args);
  90   reg_t get_pc(const std::vector<std::string>& args);
  91
  92   friend class processor_t;
  93   friend class mmu_t;
  94
  95   // htif
  96   friend void sim_thread_main(void*);
  97   void main();
  98
  99   context_t* host;
 100   context_t target;
 101   void reset();
 102   void idle();
 103   void read_chunk(addr_t taddr, size_t len, void* dst);
 104   void write_chunk(addr_t taddr, size_t len, const void* src);
 105   size_t chunk_align() { return 8; }
 106   size_t chunk_max_size() { return 8; }
 107 };
 108
 109 extern volatile bool ctrlc_pressed;
 110
 111 #endif