riscv/htif.h

   1 #ifndef _HTIF_H
   2 #define _HTIF_H
   3
   4 #include <stdint.h>
   5
   6 class sim_t;
   7 struct packet;
   8
   9 // this class implements the host-target interface for program loading, etc.
  10 class htif_t
  11 {
  12 public:
  13   htif_t(int _tohost_fd, int _fromhost_fd);
  14   ~htif_t();
  15   void init(sim_t* _sim);
  16
  17   // wait for host to send start command
  18   void wait_for_start();
  19
  20   // we block on the host if the target machine reads the fromhost register,
  21   // which provides determinism in tohost/fromhost communication.
  22   void wait_for_fromhost_write();
  23
  24 private:
  25   sim_t* sim;
  26   int tohost_fd;
  27   int fromhost_fd;
  28   uint16_t seqno;
  29
  30   void nack(uint16_t seqno);
  31   void send_packet(packet* p);
  32   int wait_for_packet();
  33 };
  34
  35 #endif