src/volatile_nvram.h

// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "nvram.h"

namespace tpmd {

class VolatileNvram : public Nvram {
 public:
  VolatileNvram();
  virtual ~VolatileNvram();
  virtual bool Allocate(uint32_t slot, size_t len, uint32_t flags);
  virtual bool Free(uint32_t slot);
  virtual bool Write(uint32_t slot, const Bytes& bytes);
  virtual bool Read(uint32_t slot, Bytes* bytes);
  virtual bool is_defined(uint32_t slot);
  virtual bool is_locked(uint32_t slot);
  virtual size_t size(uint32_t slot);
  virtual size_t num_slots();

 private:
  static const unsigned int MAX_SLOTS = 16;
  static const unsigned int NVRAM_BASE = 0x20000000;

  struct BackingSlot {
    bool lockonce_;
    bool locked_;
    bool defined_;
    Bytes bytes_;
  };

  struct BackingSlot slots_[MAX_SLOTS];
};

}  // namespace tpmd