Method RecursiveFreePageTable

src/memory/virtual_memory.cpp:210–242

}

auto VirtualMemory::RecursiveFreePageTable(uint64_t* table, size_t level,
                                           bool free_pages) -> void {
  if (table == nullptr) {
    return;
  }

  // 遍历页表中的所有条目
  for (size_t i = 0; i < kEntriesPerTable; ++i) {
    uint64_t pte = table[i];
    if (!cpu_io::virtual_memory::IsPageTableEntryValid(pte)) {
      continue;
    }

    auto pa = cpu_io::virtual_memory::PageTableEntryToPhysical(pte);

    // 如果不是最后一级，递归释放子页表
    if (level > 0) {
      RecursiveFreePageTable(reinterpret_cast<uint64_t*>(pa), level - 1,
                             free_pages);
    } else if (free_pages) {
      // 最后一级页表，释放物理页
      aligned_free(reinterpret_cast<void*>(pa));
    }

    // 清除页表项
    table[i] = 0;
  }

  // 如果不是根页表，释放当前页表
  if (level < cpu_io::virtual_memory::kPageTableLevels - 1) {
    aligned_free(table);
  }
}

auto VirtualMemory::RecursiveClonePageTable(uint64_t* src_table,
                                            uint64_t* dst_table, size_t level,