Mmu.h

//
// Created by moiz on 5/10/20.
//

#ifndef ASSEMBLER_TEST_MMU_H
#define ASSEMBLER_TEST_MMU_H

#include <memory>
#include "memory_wrapper.h"
#include "riscv_cpu_common.h"

namespace RISCV_EMULATOR {

class Mmu {
 public:
  void SetMemory(std::shared_ptr<MemoryWrapper> memory);
  void SetMxl(const int mxl) { mxl_ = mxl; }
  void SetPrivilege(const PrivilegeMode privilege);
  uint64_t VirtualToPhysical(uint64_t virtual_address, uint64_t satp, bool write_access = false);
  bool GetPageFault() { return page_fault_; }
  uint64_t GetFaultingAddress() { return faulting_address_; }

 private:
  uint64_t VirtualToPhysical32(uint64_t virtual_address, uint64_t satp, bool write_access = false);

  uint64_t VirtualToPhysical64(uint64_t virtual_address, uint64_t satp, bool write_access = false);

  std::shared_ptr<MemoryWrapper> memory_;
  int mxl_ = 0;
  bool page_fault_ = false;
  uint64_t faulting_address_ = 0;
  PrivilegeMode privilege_ = PrivilegeMode::MACHINE_MODE;
  static constexpr int kPageSize = 1 << 12;  // PAGESIZE is 2^12.
  static constexpr int kMmuLevels = 2;
};

}  // namespace RISCV_EMULATOR

#endif  // ASSEMBLER_TEST_MMU_H