PageMgr.h

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// a way to create and find our pages.
// I'm thinking about a separate way of getting a paged area.
 
/* ========================================
 
  Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
 
======================================== */
 
#pragma once
 
#include <NeKit/Config.h>
#include <NeKit/Ref.h>
 
namespace Kernel {
class PageMgr;
 
class PTEWrapper final {
 public:
  explicit PTEWrapper(Boolean Rw = false, Boolean User = false, Boolean ExecDisable = false,
                      UIntPtr Address = 0);
 
  ~PTEWrapper();
 
  PTEWrapper& operator=(const PTEWrapper&) = default;
  PTEWrapper(const PTEWrapper&)            = default;
 
 public:
  UIntPtr VirtualAddress();
 
  Void NoExecute(const bool enable = false);
  Bool NoExecute();
 
  operator bool() { return fVirtAddr; }
 
  bool Reclaim();
  bool Shareable();
  bool Present();
  bool Access();
 
 private:
  Boolean fRw;
  Boolean fUser;
  Boolean fExecDisable;
  UIntPtr fVirtAddr;
  Boolean fCache;
  Boolean fShareable;
  Boolean fWt;
  Boolean fPresent;
  Boolean fAccessed;
 
 private:
  friend class PageMgr;
  friend class Pmm;
};
 
struct PageMgr final {
 public:
  PageMgr()  = default;
  ~PageMgr() = default;
 
  PageMgr& operator=(const PageMgr&) = default;
  PageMgr(const PageMgr&)            = default;
 
 public:
  PTEWrapper Request(Boolean Rw, Boolean User, Boolean ExecDisable, SizeT Sz, SizeT Pad);
  bool       Free(Ref<PTEWrapper>& wrapper);
 
 private:
  void FlushTLB();
 
 private:
  friend PTEWrapper;
  friend class Pmm;
};
}  // namespace Kernel