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);
}
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;
}
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;
}
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;
}
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;
}
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;
}
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
}
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
}
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");
}
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;
}
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;
}
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
}
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_);
}
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;
}
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");
}
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);
}
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;
}
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;
}
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;
}
