riscv/processor.h

   1 #ifndef _RISCV_PROCESSOR_H
   2 #define _RISCV_PROCESSOR_H
   3
   4 #include "decode.h"
   5 #include <cstring>
   6 #include "trap.h"
   7
   8 #define MAX_UTS 2048
   9
  10 class processor_t;
  11 class mmu_t;
  12 typedef reg_t (*insn_func_t)(processor_t*, insn_t, reg_t);
  13 class sim_t;
  14
  15 // this class represents one processor in a RISC-V machine.
  16 class processor_t
  17 {
  18 public:
  19   processor_t(sim_t* _sim, mmu_t* _mmu, uint32_t _id);
  20   ~processor_t();
  21
  22   void step(size_t n, bool noisy); // run for n cycles
  23   void deliver_ipi(); // register an interprocessor interrupt
  24
  25 private:
  26   sim_t& sim;
  27   mmu_t& mmu; // main memory is always accessed via the mmu
  28
  29   // user-visible architected state
  30   reg_t XPR[NXPR];
  31   freg_t FPR[NFPR];
  32   reg_t pc;
  33
  34   // counters
  35   reg_t cycle;
  36
  37   // privileged control registers
  38   reg_t epc;
  39   reg_t badvaddr;
  40   reg_t evec;
  41   reg_t pcr_k0;
  42   reg_t pcr_k1;
  43   uint32_t cause;
  44   uint32_t interrupts_pending;
  45   uint32_t id;
  46   uint32_t sr; // only modify the status register using set_sr()
  47   uint32_t fsr;
  48   uint32_t count;
  49   uint32_t compare;
  50
  51   // # of bits in an XPR (32 or 64). (redundant with sr)
  52   int xprlen;
  53
  54   // is this processor running? (deliver_ipi() sets this)
  55   bool run;
  56
  57   // functions
  58   void reset(); // resets architected state; halts processor if it was running
  59   void take_interrupt(); // take a trap if any interrupts are pending
  60   void set_sr(uint32_t val); // set the status register
  61   void set_fsr(uint32_t val); // set the floating-point status register
  62   void take_trap(trap_t t, bool noisy); // take an exception
  63   void disasm(insn_t insn, reg_t pc); // disassemble and print an instruction
  64
  65   // vector stuff
  66   void vcfg();
  67   void setvl(int vlapp);
  68
  69   reg_t vecbanks;
  70   uint32_t vecbanks_count;
  71
  72   bool utmode;
  73   uint32_t utidx;
  74   int vlmax;
  75   int vl;
  76   int nxfpr_bank;
  77   int nxpr_use;
  78   int nfpr_use;
  79   processor_t* uts[MAX_UTS];
  80
  81   // this constructor is used for each of the uts
  82   processor_t(sim_t* _sim, mmu_t* _mmu, uint32_t _id, uint32_t _utidx);
  83
  84   friend class sim_t;
  85   friend class mmu_t;
  86
  87   #include "dispatch.h"
  88 };
  89
  90 #endif