riscv/icsim.h

   1 #ifndef _RISCV_ICSIM_H
   2 #define _RISCV_ICSIM_H
   3
   4 #include <cstring>
   5 #include <string>
   6 #include <stdint.h>
   7
   8 class lfsr_t
   9 {
  10 public:
  11   lfsr_t() : reg(1) {}
  12   lfsr_t(const lfsr_t& lfsr) : reg(lfsr.reg) {}
  13   uint32_t next() { return reg = (reg>>1)^(-(reg&1) & 0xd0000001); }
  14 private:
  15   uint32_t reg;
  16 };
  17
  18 class icsim_t
  19 {
  20 public:
  21   icsim_t(size_t sets, size_t ways, size_t linesz, const char* name);
  22   icsim_t(const icsim_t& rhs);
  23   ~icsim_t();
  24
  25   void tick(uint64_t pc, int insnlen, bool store);
  26   void print_stats();
  27 private:
  28   lfsr_t lfsr;
  29
  30   size_t sets;
  31   size_t ways;
  32   size_t linesz;
  33   size_t idx_shift;
  34   size_t idx_mask;
  35
  36   uint64_t* tags;
  37
  38   uint64_t read_accesses;
  39   uint64_t read_misses;
  40   uint64_t bytes_read;
  41   uint64_t write_accesses;
  42   uint64_t write_misses;
  43   uint64_t bytes_written;
  44   uint64_t writebacks;
  45
  46   std::string name;
  47
  48   static const uint64_t VALID = 1ULL << 63;
  49   static const uint64_t DIRTY = 1ULL << 62;
  50 };
  51
  52 #endif