Esempio n. 1
0
void ArchMemory::freePageDirectory(uint32 physical_page_directory_page)
{
  PageDirEntry *page_directory = (PageDirEntry *) getIdentAddressOfPPN(physical_page_directory_page);
  for (uint32 pde_vpn=0; pde_vpn < PAGE_DIRECTORY_ENTRIES; ++pde_vpn)
  {
    if (page_directory[pde_vpn].pt.present)
    {
      if (page_directory[pde_vpn].page.size)
      {
        page_directory[pde_vpn].page.present=0;
          for (uint32 p=0;p<1024;++p)
            PageManager::instance()->freePPN(page_directory[pde_vpn].page.page_ppn*1024 + p);
      }
      else
      {
        PageTableEntry *pte_base = (PageTableEntry *) getIdentAddressOfPPN(page_directory[pde_vpn].pt.page_table_ppn);
        for (uint32 pte_vpn=0; pte_vpn < PAGE_TABLE_ENTRIES; ++pte_vpn)
        {
          if (pte_base[pte_vpn].present)
          {
            pte_base[pte_vpn].present = 0;
            PageManager::instance()->freePPN(pte_base[pte_vpn].page_ppn);
          }
        }
        page_directory[pde_vpn].pt.present=0;
        PageManager::instance()->freePPN(page_directory[pde_vpn].pt.page_table_ppn);
      }
    }
  }
  PageManager::instance()->freePPN(physical_page_directory_page);
}
Esempio n. 2
0
bool ArchMemory::mapPage(uint32 virtual_page, uint32 physical_page, uint32 user_access)
{
  RESOLVEMAPPING(page_dir_pointer_table_,virtual_page);

  if (page_dir_pointer_table_[pdpte_vpn].present == 0)
  {
    uint32 pd_ppn = PageManager::instance()->allocPPN();
    page_directory = (PageDirEntry*) getIdentAddressOfPPN(pd_ppn);
    insertPD(pdpte_vpn, pd_ppn);
  }

  if (page_directory[pde_vpn].pt.present == 0)
  {
    insertPT(page_directory, pde_vpn, PageManager::instance()->allocPPN());
  }
  assert(page_directory[pde_vpn].page.size == 0);

  PageTableEntry *pte_base = (PageTableEntry *) getIdentAddressOfPPN(page_directory[pde_vpn].pt.page_table_ppn);
  if(pte_base[pte_vpn].present == 0)
  {
    pte_base[pte_vpn].writeable = 1;
    pte_base[pte_vpn].user_access = user_access;
    pte_base[pte_vpn].page_ppn = physical_page;
    pte_base[pte_vpn].present = 1;
    return true;
  }

  assert(false);
  return false;
}
Esempio n. 3
0
bool ArchMemory::mapPage(uint64 virtual_page, uint64 physical_page, uint64 user_access)
{
  debug(A_MEMORY, "%zx %zx %zx %zx\n", page_map_level_4_, virtual_page, physical_page, user_access);
  ArchMemoryMapping m = resolveMapping(page_map_level_4_, virtual_page);
  assert((m.page_size == 0) || (m.page_size == PAGE_SIZE));

  if (m.pdpt_ppn == 0)
  {
    m.pdpt_ppn = PageManager::instance()->allocPPN();
    insert<PageMapLevel4Entry>((pointer) m.pml4, m.pml4i, m.pdpt_ppn, 1, 0, 1, 1);
  }

  if (m.pd_ppn == 0)
  {
    m.pd_ppn = PageManager::instance()->allocPPN();
    insert<PageDirPointerTablePageDirEntry>(getIdentAddressOfPPN(m.pdpt_ppn), m.pdpti, m.pd_ppn, 1, 0, 1, 1);
  }

  if (m.pt_ppn == 0)
  {
    m.pt_ppn = PageManager::instance()->allocPPN();
    insert<PageDirPageTableEntry>(getIdentAddressOfPPN(m.pd_ppn), m.pdi, m.pt_ppn, 1, 0, 1, 1);
  }

  if (m.page_ppn == 0)
  {
    return insert<PageTableEntry>(getIdentAddressOfPPN(m.pt_ppn), m.pti, physical_page, 0, 0, user_access, 1);
  }
  assert(false); // you should never get here
  return false;
}
Esempio n. 4
0
bool ArchMemory::unmapPage(uint64 virtual_page)
{
  ArchMemoryMapping m = resolveMapping(page_map_level_4_, virtual_page);

  assert(m.page_ppn != 0 && m.page_size == PAGE_SIZE && m.pt[m.pti].present);
  m.pt[m.pti].present = 0;
  PageManager::instance()->freePPN(m.page_ppn, PAGE_SIZE);
  ((uint64*)m.pt)[m.pti] = 0; // for easier debugging
  bool empty = checkAndRemove<PageTableEntry>(getIdentAddressOfPPN(m.pt_ppn), m.pti);
  if (empty) 
  {
    PageManager::instance()->freePPN(m.pt_ppn, PAGE_SIZE);
    empty = checkAndRemove<PageDirPageTableEntry>(getIdentAddressOfPPN(m.pd_ppn), m.pdi);
  }
  if (empty) 
  {
    PageManager::instance()->freePPN(m.pd_ppn, PAGE_SIZE);
    empty = checkAndRemove<PageDirPointerTablePageDirEntry>(getIdentAddressOfPPN(m.pdpt_ppn), m.pdpti);
  }
  if (empty) 
  {
    PageManager::instance()->freePPN(m.pdpt_ppn, PAGE_SIZE);
    empty = checkAndRemove<PageMapLevel4Entry>(getIdentAddressOfPPN(m.pml4_ppn), m.pml4i);
  }
  return true;
}
Esempio n. 5
0
bool ArchMemory::unmapPage(uint64 virtual_page)
{
  ArchMemoryMapping m = resolveMapping(page_map_level_4_, virtual_page);

  assert(m.page_ppn != 0 && m.page_size == PAGE_SIZE);
  bool empty = checkAndRemove<PageTableEntry>(getIdentAddressOfPPN(m.pt_ppn), m.pti);
  if (empty)
    empty = checkAndRemove<PageDirPageEntry>(getIdentAddressOfPPN(m.pd_ppn), m.pdi);
  if (empty)
    empty = checkAndRemove<PageDirPointerTablePageDirEntry>(getIdentAddressOfPPN(m.pdpt_ppn), m.pdpti);
  if (empty)
    empty = checkAndRemove<PageMapLevel4Entry>(getIdentAddressOfPPN(m.pml4_ppn), m.pml4i);
  return true;
}
Esempio n. 6
0
uint32 ArchMemory::get_PPN_Of_VPN_In_KernelMapping(uint32 virtual_page, size_t *physical_page, uint32 *physical_pte_page)
{
  PageDirPointerTableEntry *pdpt = kernel_page_directory_pointer_table;
  RESOLVEMAPPING(pdpt, virtual_page);
  if (pdpt[pdpte_vpn].present)
  {
    if (page_directory[pde_vpn].pt.present)
    {
      if (page_directory[pde_vpn].page.size)
      {
        if (physical_page)
          *physical_page = page_directory[pde_vpn].page.page_ppn;
        return (PAGE_SIZE*PAGE_TABLE_ENTRIES);
      }
      else
      {
        if (physical_pte_page)
          *physical_pte_page = page_directory[pde_vpn].pt.page_table_ppn;
        PageTableEntry *pte_base = (PageTableEntry *) getIdentAddressOfPPN(page_directory[pde_vpn].pt.page_table_ppn);
        if (pte_base[pte_vpn].present)
        {
          if (physical_page)
            *physical_page = pte_base[pte_vpn].page_ppn;
          return PAGE_SIZE;
        }
      }
    }
  }
  return 0;
}
Esempio n. 7
0
ArchMemory::ArchMemory()
{
  page_map_level_4_ = PageManager::instance()->getFreePhysicalPage();
  PageMapLevel4Entry* new_pml4 = (PageMapLevel4Entry*) getIdentAddressOfPPN(page_map_level_4_);
  ArchCommon::memcpy((pointer) new_pml4,(pointer)kernel_page_map_level_4, PAGE_SIZE);
  bzero(new_pml4,PAGE_SIZE / 2); // should be zero, this is just for safety
}
Esempio n. 8
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ArchMemory::ArchMemory()
{
  page_map_level_4_ = PageManager::instance()->allocPPN();
  PageMapLevel4Entry* new_pml4 = (PageMapLevel4Entry*) getIdentAddressOfPPN(page_map_level_4_);
  memcpy((void*) new_pml4, (void*) kernel_page_map_level_4, PAGE_SIZE);
  memset(new_pml4, 0, PAGE_SIZE / 2); // should be zero, this is just for safety
}
Esempio n. 9
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void ArchMemory::unmapKernelPage(size_t virtual_page)
{
  ArchMemoryMapping mapping = resolveMapping(((uint64) VIRTUAL_TO_PHYSICAL_BOOT(kernel_page_map_level_4) / PAGE_SIZE),
                                             virtual_page);
  PageMapLevel4Entry* pml4 = kernel_page_map_level_4;
  assert(pml4[mapping.pml4i].present);
  PageDirPointerTableEntry *pdpt = (PageDirPointerTableEntry*) getIdentAddressOfPPN(pml4[mapping.pml4i].page_ppn);
  assert(pdpt[mapping.pdpti].pd.present);
  PageDirEntry *pd = (PageDirEntry*) getIdentAddressOfPPN(pdpt[mapping.pdpti].pd.page_ppn);
  assert(pd[mapping.pdi].pt.present);
  PageTableEntry *pt = (PageTableEntry*) getIdentAddressOfPPN(pd[mapping.pdi].pt.page_ppn);
  assert(pt[mapping.pti].present);
  pt[mapping.pti].present = 0;
  pt[mapping.pti].writeable = 0;
  PageManager::instance()->freePPN(pt[mapping.pti].page_ppn);
  asm volatile ("movq %%cr3, %%rax; movq %%rax, %%cr3;" ::: "%rax");
}
Esempio n. 10
0
void ArchMemory::insertPD(uint32 pdpt_vpn, uint32 physical_page_directory_page)
{
  kprintfd("insertPD: pdpt %p pdpt_vpn %x physical_page_table_page %x\n",page_dir_pointer_table_,pdpt_vpn,physical_page_directory_page);
  memset((void*)getIdentAddressOfPPN(physical_page_directory_page), 0,PAGE_SIZE);
  memset((void*)(page_dir_pointer_table_ + pdpt_vpn), 0, sizeof(PageDirPointerTableEntry));
  page_dir_pointer_table_[pdpt_vpn].page_directory_ppn = physical_page_directory_page;
  page_dir_pointer_table_[pdpt_vpn].present = 1;
}
Esempio n. 11
0
pointer ArchMemory::checkAddressValid(uint32 vaddress_to_check)
{
  RESOLVEMAPPING(page_dir_pointer_table_, vaddress_to_check / PAGE_SIZE);
  if (page_dir_pointer_table_[pdpte_vpn].present)
  {
    if (page_directory[pde_vpn].pt.present)
    {
      if (page_directory[pde_vpn].page.size)
        return getIdentAddressOfPPN(page_directory[pde_vpn].page.page_ppn,PAGE_SIZE * PAGE_TABLE_ENTRIES) | (vaddress_to_check % (PAGE_SIZE * PAGE_TABLE_ENTRIES));

      PageTableEntry *pte_base = (PageTableEntry *) getIdentAddressOfPPN(page_directory[pde_vpn].pt.page_table_ppn);
      if (pte_base[pte_vpn].present)
        return getIdentAddressOfPPN(pte_base[pte_vpn].page_ppn) | (vaddress_to_check % PAGE_SIZE);
    }
  }
  return 0;
}
Esempio n. 12
0
void ArchMemory::checkAndRemovePT(uint32 physical_page_directory_page, uint32 pde_vpn)
{
  PageDirEntry *page_directory = (PageDirEntry *) getIdentAddressOfPPN(physical_page_directory_page);
  PageTableEntry *pte_base = (PageTableEntry *) getIdentAddressOfPPN(page_directory[pde_vpn].pt.page_table_ppn);
  assert(page_directory[pde_vpn].page.size == 0);

  if (!page_directory[pde_vpn].pt.present) return; // PT not present -> do nothing.

  for (uint32 pte_vpn=0; pte_vpn < PAGE_TABLE_ENTRIES; ++pte_vpn)
    if (pte_base[pte_vpn].present > 0)
      return; //not empty -> do nothing

  //else:
  page_directory[pde_vpn].pt.present = 0;
  PageManager::instance()->freePPN(page_directory[pde_vpn].pt.page_table_ppn);
  ((uint64*)page_directory)[pde_vpn] = 0; // for easier debugging
}
Esempio n. 13
0
ArchMemory::~ArchMemory()
{
  PageMapLevel4Entry* pml4 = (PageMapLevel4Entry*) getIdentAddressOfPPN(page_map_level_4_);
  for (uint64 pml4i = 0; pml4i < PAGE_MAP_LEVEL_4_ENTRIES / 2; pml4i++) // free only lower half
  {
    if (pml4[pml4i].present)
    {
      PageDirPointerTableEntry* pdpt = (PageDirPointerTableEntry*) getIdentAddressOfPPN(pml4[pml4i].page_ppn);
      for (uint64 pdpti = 0; pdpti < PAGE_DIR_POINTER_TABLE_ENTRIES; pdpti++)
      {
        if (pdpt[pdpti].pd.present)
        {
          assert(pdpt[pdpti].pd.size == 0);
          PageDirEntry* pd = (PageDirEntry*) getIdentAddressOfPPN(pdpt[pdpti].pd.page_ppn);
          for (uint64 pdi = 0; pdi < PAGE_DIR_ENTRIES; pdi++)
          {
            if (pd[pdi].pt.present)
            {
              assert(pd[pdi].pt.size == 0);
              PageTableEntry* pt = (PageTableEntry*) getIdentAddressOfPPN(pd[pdi].pt.page_ppn);
              for (uint64 pti = 0; pti < PAGE_TABLE_ENTRIES; pti++)
              {
                if (pt[pti].present)
                {
                  pt[pti].present = 0;
                  PageManager::instance()->freePPN(pt[pti].page_ppn);
                }
              }
              pd[pdi].pt.present = 0;
              PageManager::instance()->freePPN(pd[pdi].pt.page_ppn);
            }
          }
          pdpt[pdpti].pd.present = 0;
          PageManager::instance()->freePPN(pdpt[pdpti].pd.page_ppn);
        }
      }
      pml4[pml4i].present = 0;
      PageManager::instance()->freePPN(pml4[pml4i].page_ppn);
    }
  }
  PageManager::instance()->freePPN(page_map_level_4_);
}
Esempio n. 14
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void ArchMemory::insertPT(PageDirEntry* page_directory, uint32 pde_vpn, uint32 physical_page_table_page)
{
  kprintfd("insertPT: page_directory %p pde_vpn %x physical_page_table_page %x\n",page_directory,pde_vpn,physical_page_table_page);
  memset((void*)getIdentAddressOfPPN(physical_page_table_page), 0, PAGE_SIZE);
  memset((void*)(page_directory + pde_vpn), 0, sizeof(PageDirPointerTableEntry));
  page_directory[pde_vpn].pt.writeable = 1;
  page_directory[pde_vpn].pt.size = 0;
  page_directory[pde_vpn].pt.page_table_ppn = physical_page_table_page;
  page_directory[pde_vpn].pt.user_access = 1;
  page_directory[pde_vpn].pt.present = 1;
}
Esempio n. 15
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void ArchMemory::unmapKernelPage(uint32 virtual_page)
{
  PageDirPointerTableEntry *pdpt = kernel_page_directory_pointer_table;
  RESOLVEMAPPING(pdpt, virtual_page);
  assert(pdpt[pdpte_vpn].present);
  assert(page_directory[pde_vpn].pt.present && page_directory[pde_vpn].pt.size == 0);
  PageTableEntry *pte_base = (PageTableEntry *) getIdentAddressOfPPN(page_directory[pde_vpn].pt.page_table_ppn);
  assert(pte_base[pte_vpn].present);
  pte_base[pte_vpn].present = 0;
  pte_base[pte_vpn].writeable = 0;
  PageManager::instance()->freePPN(pte_base[pte_vpn].page_ppn);
  asm volatile ("movl %%cr3, %%eax; movl %%eax, %%cr3;" ::: "%eax");
}
Esempio n. 16
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void ArchMemory::unmapPage(uint32 virtual_page)
{
  RESOLVEMAPPING(page_dir_pointer_table_,virtual_page);

  assert(page_dir_pointer_table_[pdpte_vpn].present);
  assert(!page_directory[pde_vpn].page.size);

  PageTableEntry *pte_base = (PageTableEntry *) getIdentAddressOfPPN(page_directory[pde_vpn].pt.page_table_ppn);
  assert(pte_base[pte_vpn].present);

  pte_base[pte_vpn].present = 0;
  PageManager::instance()->freePPN(pte_base[pte_vpn].page_ppn);
  ((uint64*)pte_base)[pte_vpn] = 0; // for easier debugging

  checkAndRemovePT(page_dir_pointer_table_[pdpte_vpn].page_directory_ppn, pde_vpn);
}
Esempio n. 17
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bool ArchMemory::insert(pointer map_ptr, uint64 index, uint64 ppn, uint64 bzero, uint64 size, uint64 user_access, uint64 writeable)
{
  assert(map_ptr & ~0xFFFFF00000000000ULL);
  T* map = (T*) map_ptr;
  debug(A_MEMORY,"%s: page %x index %x ppn %x user_access %x size %x\n", __PRETTY_FUNCTION__, map, index, ppn, user_access, size);
  if (bzero)
  {
    ArchCommon::bzero(getIdentAddressOfPPN(ppn), PAGE_SIZE);
    assert(((uint64*)map)[index] == 0);
  }
  map[index].size = size;
  map[index].writeable = writeable;
  map[index].page_ppn = ppn;
  map[index].user_access = user_access;
  map[index].present = 1;
  return true;
}
Esempio n. 18
0
bool ArchMemory::mapPage(uint64 virtual_page, uint64 physical_page, uint64 user_access, uint64 page_size)
{
  debug(A_MEMORY,"%x %x %x %x %x\n",page_map_level_4_, virtual_page, physical_page, user_access, page_size);
  PageMapLevel4Entry* pml4p = (PageMapLevel4Entry*) getIdentAddressOfPPN(page_map_level_4_);
  ArchMemoryMapping m = resolveMapping(page_map_level_4_, virtual_page);

  if (m.pdpt_ppn == 0)
  {
    m.pdpt_ppn = PageManager::instance()->getFreePhysicalPage();
    insert<PageMapLevel4Entry>((pointer) m.pml4, m.pml4i, m.pdpt_ppn, 1, 0, 1, 1);
  }

  if (m.pd_ppn == 0)
  {
    if (page_size == PAGE_SIZE * PAGE_TABLE_ENTRIES * PAGE_DIR_ENTRIES)
    {
      return insert<PageDirPointerTablePageEntry>(getIdentAddressOfPPN(m.pdpt_ppn), m.pdi, physical_page, 0, 1,
                                                     user_access, 1);
    }
    else
    {
      m.pd_ppn = PageManager::instance()->getFreePhysicalPage();
      insert<PageDirPointerTablePageDirEntry>(getIdentAddressOfPPN(m.pdpt_ppn), m.pdpti, m.pd_ppn, 1, 0, 1, 1);
    }
  }

  if (m.pt_ppn == 0)
  {
    if (page_size == PAGE_SIZE * PAGE_TABLE_ENTRIES)
    {
      return insert<PageDirPageEntry>(getIdentAddressOfPPN(m.pd_ppn), m.pdi, physical_page, 0, 1, user_access, 1);
    }
    else// if (m.pd == 0)
    {
      m.pt_ppn = PageManager::instance()->getFreePhysicalPage();
      insert<PageDirPageTableEntry>(getIdentAddressOfPPN(m.pd_ppn), m.pdi, m.pt_ppn, 1, 0, 1, 1);
    }
  }

  if (m.page_ppn == 0 && page_size == PAGE_SIZE)
  {
    return insert<PageTableEntry>(getIdentAddressOfPPN(m.pt_ppn), m.pti, physical_page, 0, 0, user_access, 1);
  }
  assert(false); // you should never get here
  return false;
}
Esempio n. 19
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ArchMemoryMapping ArchMemory::resolveMapping(uint64 pml4, uint64 vpage)
{
  ArchMemoryMapping m;

  m.pti = vpage;
  m.pdi = m.pti / PAGE_TABLE_ENTRIES;
  m.pdpti = m.pdi / PAGE_DIR_ENTRIES;
  m.pml4i = m.pdpti / PAGE_DIR_POINTER_TABLE_ENTRIES;

  m.pti %= PAGE_TABLE_ENTRIES;
  m.pdi %= PAGE_DIR_ENTRIES;
  m.pdpti %= PAGE_DIR_POINTER_TABLE_ENTRIES;
  m.pml4i %= PAGE_MAP_LEVEL_4_ENTRIES;

  assert(pml4 <= 2048);
  m.pml4 = (PageMapLevel4Entry*) getIdentAddressOfPPN(pml4);
  m.pdpt = 0;
  m.pd = 0;
  m.pt = 0;
  m.page = 0;
  m.pml4_ppn = pml4;
  m.pdpt_ppn = 0;
  m.pd_ppn = 0;
  m.pt_ppn = 0;
  m.page_ppn = 0;
  m.page_size = 0;
  if (m.pml4[m.pml4i].present)
  {
    m.pdpt_ppn = m.pml4[m.pml4i].page_ppn;
    m.pdpt = (PageDirPointerTableEntry*) getIdentAddressOfPPN(m.pml4[m.pml4i].page_ppn);
    if (m.pdpt[m.pdpti].pd.present && !m.pdpt[m.pdpti].pd.size) // 1gb page ?
    {
      m.pd_ppn = m.pdpt[m.pdpti].pd.page_ppn;
      if (m.pd_ppn > 2048)
      {
        debug(A_MEMORY, "%zx\n", m.pd_ppn);
      }
      assert(m.pd_ppn <= 2048);
      m.pd = (PageDirEntry*) getIdentAddressOfPPN(m.pdpt[m.pdpti].pd.page_ppn);
      if (m.pd[m.pdi].pt.present && !m.pd[m.pdi].pt.size) // 2mb page ?
      {
        m.pt_ppn = m.pd[m.pdi].pt.page_ppn;
        assert(m.pt_ppn <= 2048);
        m.pt = (PageTableEntry*) getIdentAddressOfPPN(m.pd[m.pdi].pt.page_ppn);
        if (m.pt[m.pti].present)
        {
          m.page = getIdentAddressOfPPN(m.pt[m.pti].page_ppn);
          m.page_ppn = m.pt[m.pti].page_ppn;
          assert(m.page_ppn <= 2048);
          m.page_size = PAGE_SIZE;
        }
      }
      else if (m.pd[m.pdi].page.present)
      {
        m.page_size = PAGE_SIZE * PAGE_TABLE_ENTRIES;
        m.page_ppn = m.pd[m.pdi].page.page_ppn;
        assert(m.page_ppn <= 2048);
        m.page = getIdentAddressOfPPN(m.pd[m.pdi].page.page_ppn);
      }
    }
    else if (m.pdpt[m.pdpti].page.present)
    {
      m.page_size = PAGE_SIZE * PAGE_TABLE_ENTRIES * PAGE_DIR_ENTRIES;
      m.page_ppn = m.pdpt[m.pdpti].page.page_ppn;
      assert(m.page_ppn <= 2048);
      m.page = getIdentAddressOfPPN(m.pdpt[m.pdpti].page.page_ppn);
    }
  }
  return m;
}