/* -------------------------------------------

  Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.

------------------------------------------- */

#include <KernelKit/DebugOutput.h>
#include <NewKit/PageMgr.h>

#ifdef __NE_AMD64__
#include <HALKit/AMD64/Paging.h>
#elif defined(__NE_ARM64__)
#include <HALKit/ARM64/Paging.h>
#endif  // ifdef __NE_AMD64__ || defined(__NE_ARM64__)

namespace Kernel {
PTEWrapper::PTEWrapper(Boolean Rw, Boolean User, Boolean ExecDisable, UIntPtr VirtAddr)
    : fRw(Rw),
      fUser(User),
      fExecDisable(ExecDisable),
      fVirtAddr(VirtAddr),
      fCache(false),
      fShareable(false),
      fWt(false),
      fPresent(true),
      fAccessed(false) {}

PTEWrapper::~PTEWrapper() = default;

/// @brief Flush virtual address.
/// @param VirtAddr
Void PageMgr::FlushTLB() {
#ifndef __NE_MINIMAL_OS__
  hal_flush_tlb();
#endif  // !__NE_MINIMAL_OS__
}

/// @brief Reclaim freed page.
/// @return
Bool PTEWrapper::Reclaim() {
  if (!this->fPresent) {
    this->fPresent = true;
    return true;
  }

  return false;
}

/// @brief Request a PTE.
/// @param Rw r/w?
/// @param User user mode?
/// @param ExecDisable disable execution on page?
/// @return
PTEWrapper PageMgr::Request(Boolean Rw, Boolean User, Boolean ExecDisable, SizeT Sz, SizeT Pad) {
  // Store PTE wrapper right after PTE.
  VoidPtr ptr = Kernel::HAL::mm_alloc_bitmap(Rw, User, Sz, NO, Pad);

  return PTEWrapper{Rw, User, ExecDisable, reinterpret_cast<UIntPtr>(ptr)};
}

/// @brief Disable BitMap.
/// @param wrapper the wrapper.
/// @return If the page bitmap was cleared or not.
Bool PageMgr::Free(Ref<PTEWrapper>& wrapper) {
  if (!Kernel::HAL::mm_free_bitmap((VoidPtr) wrapper.Leak().VirtualAddress())) return false;

  return true;
}

/// @brief Virtual PTE address.
/// @return The virtual address of the page.
UIntPtr PTEWrapper::VirtualAddress() {
  return (fVirtAddr);
}

Bool PTEWrapper::Shareable() {
  return fShareable;
}

Bool PTEWrapper::Present() {
  return fPresent;
}

Bool PTEWrapper::Access() {
  return fAccessed;
}

Void PTEWrapper::NoExecute(const bool enable) {
  fExecDisable = enable;
}

Bool PTEWrapper::NoExecute() {
  return fExecDisable;
}
}  // namespace Kernel