mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-11 05:25:32 +03:00
Replace zones with individually tracked physical pages.
It's just a simple struct { ref_count, paddr }. This will allow me to implement lazy zeroing and COW pages.
This commit is contained in:
parent
b5c5286ee1
commit
72cdc62155
Notes:
sideshowbarker
2024-07-19 18:33:43 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/72cdc62155b
@ -32,6 +32,7 @@ public:
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RetainPtr(RetainPtr& other) : m_ptr(other.copyRef().leakRef()) { }
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RetainPtr(RetainPtr&& other) : m_ptr(other.leakRef()) { }
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template<typename U> RetainPtr(RetainPtr<U>&& other) : m_ptr(static_cast<T*>(other.leakRef())) { }
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RetainPtr(const RetainPtr& other) : m_ptr(const_cast<RetainPtr&>(other).copyRef().leakRef()) { }
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~RetainPtr()
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{
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clear();
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@ -121,6 +122,8 @@ public:
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operator bool() { return !!m_ptr; }
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bool is_null() const { return !m_ptr; }
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private:
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T* m_ptr = nullptr;
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};
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17
AK/Vector.h
17
AK/Vector.h
@ -75,6 +75,13 @@ public:
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other.m_impl = nullptr;
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}
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Vector(const Vector& other)
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{
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ensureCapacity(other.size());
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for (size_t i = 0; i < other.size(); ++i)
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unchecked_append(other[i]);
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}
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Vector& operator=(Vector&& other)
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{
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if (this != &other) {
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@ -140,16 +147,22 @@ public:
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Vector<T> tmp = move(other);
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ensureCapacity(size() + tmp.size());
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for (auto&& v : tmp) {
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uncheckedAppend(move(v));
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unchecked_append(move(v));
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}
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}
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void uncheckedAppend(T&& value)
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void unchecked_append(T&& value)
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{
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new (m_impl->slot(m_impl->m_size)) T(move(value));
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++m_impl->m_size;
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}
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void unchecked_append(const T& value)
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{
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new (m_impl->slot(m_impl->m_size)) T(value);
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++m_impl->m_size;
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}
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void append(T&& value)
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{
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ensureCapacity(size() + 1);
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@ -45,12 +45,12 @@ void MemoryManager::release_page_directory(PageDirectory& page_directory)
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dbgprintf("MM: release_page_directory for PD K%x\n", &page_directory);
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#endif
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for (size_t i = 0; i < 1024; ++i) {
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auto page_table = page_directory.physical_addresses[i];
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auto& page_table = page_directory.physical_pages[i];
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if (!page_table.is_null()) {
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#ifdef MM_DEBUG
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dbgprintf("MM: deallocating process page table [%u] P%x @ %p\n", i, page_table.get(), &process.m_page_directory->physical_addresses[i]);
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dbgprintf("MM: deallocating user page table P%x\n", page_table->paddr().get());
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#endif
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deallocate_page_table(page_table);
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deallocate_page_table(page_directory, i);
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}
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}
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#ifdef SCRUB_DEALLOCATED_PAGE_TABLES
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@ -76,9 +76,9 @@ void MemoryManager::initializePaging()
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// The bottom 4 MB are identity mapped & supervisor only. Every process shares these mappings.
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create_identity_mapping(LinearAddress(PAGE_SIZE), 4 * MB);
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// The physical pages 4 MB through 8 MB are available for Zone allocation.
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// The physical pages 4 MB through 8 MB are available for allocation.
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for (size_t i = (4 * MB) + PAGE_SIZE; i < (8 * MB); i += PAGE_SIZE)
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m_freePages.append(PhysicalAddress(i));
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m_free_physical_pages.append(adopt(*new PhysicalPage(PhysicalAddress(i))));
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asm volatile("movl %%eax, %%cr3"::"a"(m_kernel_page_directory));
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asm volatile(
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@ -88,20 +88,29 @@ void MemoryManager::initializePaging()
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);
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}
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PhysicalAddress MemoryManager::allocate_page_table()
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RetainPtr<PhysicalPage> MemoryManager::allocate_page_table(PageDirectory& page_directory, unsigned index)
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{
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auto ppages = allocatePhysicalPages(1);
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dword address = ppages[0].get();
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auto& page_directory_physical_ptr = page_directory.physical_pages[index];
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ASSERT(!page_directory_physical_ptr);
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auto ppages = allocate_physical_pages(1);
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ASSERT(ppages.size() == 1);
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dword address = ppages[0]->paddr().get();
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create_identity_mapping(LinearAddress(address), PAGE_SIZE);
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memset((void*)address, 0, PAGE_SIZE);
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return PhysicalAddress(address);
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page_directory.physical_pages[index] = move(ppages[0]);
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return page_directory.physical_pages[index];
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}
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void MemoryManager::deallocate_page_table(PhysicalAddress paddr)
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void MemoryManager::deallocate_page_table(PageDirectory& page_directory, unsigned index)
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{
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ASSERT(!m_freePages.contains_slow(paddr));
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remove_identity_mapping(LinearAddress(paddr.get()), PAGE_SIZE);
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m_freePages.append(paddr);
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auto& physical_page = page_directory.physical_pages[index];
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ASSERT(physical_page);
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ASSERT(!m_free_physical_pages.contains_slow(physical_page));
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for (size_t i = 0; i < MM.m_free_physical_pages.size(); ++i) {
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ASSERT(MM.m_free_physical_pages[i].ptr() != physical_page.ptr());
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}
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remove_identity_mapping(LinearAddress(physical_page->paddr().get()), PAGE_SIZE);
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page_directory.physical_pages[index] = nullptr;
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}
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void MemoryManager::remove_identity_mapping(LinearAddress laddr, size_t size)
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@ -143,20 +152,21 @@ auto MemoryManager::ensurePTE(PageDirectory* page_directory, LinearAddress laddr
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pde.setPresent(true);
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pde.setWritable(true);
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} else {
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auto page_table = allocate_page_table();
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auto page_table = allocate_page_table(*page_directory, page_directory_index);
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#ifdef MM_DEBUG
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dbgprintf("MM: PD K%x (%s) allocated page table #%u (for L%x) at P%x\n",
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page_directory,
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page_directory == m_kernel_page_directory ? "Kernel" : "User",
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page_directory_index,
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laddr.get(),
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page_table);
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page_table->paddr().get());
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#endif
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page_directory->physical_addresses[page_directory_index] = page_table;
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pde.setPageTableBase(page_table.get());
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pde.setPageTableBase(page_table->paddr().get());
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pde.setUserAllowed(true);
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pde.setPresent(true);
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pde.setWritable(true);
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page_directory->physical_pages[page_directory_index] = move(page_table);
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}
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}
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return PageTableEntry(&pde.pageTableBase()[page_table_index]);
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@ -209,61 +219,18 @@ PageFaultResponse MemoryManager::handlePageFault(const PageFault& fault)
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return PageFaultResponse::ShouldCrash;
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}
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void MemoryManager::registerZone(Zone& zone)
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{
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ASSERT_INTERRUPTS_DISABLED();
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m_zones.set(&zone);
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#ifdef MM_DEBUG
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for (size_t i = 0; i < zone.m_pages.size(); ++i)
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dbgprintf("MM: allocated to zone: P%x\n", zone.m_pages[i].get());
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#endif
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}
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void MemoryManager::unregisterZone(Zone& zone)
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{
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ASSERT_INTERRUPTS_DISABLED();
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#ifdef MM_DEBUG
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for (size_t i = 0; i < zone.m_pages.size(); ++i)
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dbgprintf("MM: deallocated from zone: P%x\n", zone.m_pages[i].get());
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#endif
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m_zones.remove(&zone);
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m_freePages.append(move(zone.m_pages));
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}
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Zone::Zone(Vector<PhysicalAddress>&& pages)
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: m_pages(move(pages))
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{
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MM.registerZone(*this);
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}
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Zone::~Zone()
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{
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MM.unregisterZone(*this);
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}
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RetainPtr<Zone> MemoryManager::createZone(size_t size)
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Vector<RetainPtr<PhysicalPage>> MemoryManager::allocate_physical_pages(size_t count)
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{
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InterruptDisabler disabler;
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auto pages = allocatePhysicalPages(ceilDiv(size, PAGE_SIZE));
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if (pages.isEmpty()) {
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kprintf("MM: createZone: no physical pages for size %u\n", size);
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return nullptr;
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}
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return adopt(*new Zone(move(pages)));
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}
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Vector<PhysicalAddress> MemoryManager::allocatePhysicalPages(size_t count)
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{
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InterruptDisabler disabler;
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if (count > m_freePages.size())
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if (count > m_free_physical_pages.size())
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return { };
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Vector<PhysicalAddress> pages;
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Vector<RetainPtr<PhysicalPage>> pages;
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pages.ensureCapacity(count);
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for (size_t i = 0; i < count; ++i) {
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pages.append(m_freePages.takeLast());
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pages.append(m_free_physical_pages.takeLast());
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#ifdef MM_DEBUG
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dbgprintf("MM: allocate_physical_pages vending P%x\n", pages.last());
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dbgprintf("MM: allocate_physical_pages vending P%x\n", pages.last()->paddr().get());
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#endif
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}
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return pages;
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@ -299,17 +266,22 @@ void MemoryManager::flushTLB(LinearAddress laddr)
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void MemoryManager::map_region_at_address(PageDirectory* page_directory, Region& region, LinearAddress laddr, bool user_allowed)
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{
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InterruptDisabler disabler;
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auto& zone = *region.zone;
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for (size_t i = 0; i < zone.m_pages.size(); ++i) {
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for (size_t i = 0; i < region.physical_pages.size(); ++i) {
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auto page_laddr = laddr.offset(i * PAGE_SIZE);
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auto pte = ensurePTE(page_directory, page_laddr);
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pte.setPhysicalPageBase(zone.m_pages[i].get());
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pte.setPresent(true); // FIXME: Maybe we could use the is_readable flag here?
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auto& physical_page = region.physical_pages[i];
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if (physical_page) {
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pte.setPhysicalPageBase(physical_page->paddr().get());
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pte.setPresent(true); // FIXME: Maybe we should use the is_readable flag here?
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} else {
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pte.setPhysicalPageBase(0);
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pte.setPresent(false);
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}
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pte.setWritable(region.is_writable);
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pte.setUserAllowed(user_allowed);
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flushTLB(page_laddr);
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#ifdef MM_DEBUG
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dbgprintf("MM: >> map_region_at_address (PD=%x) L%x => P%x\n", page_directory, page_laddr, zone.m_pages[i].get());
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dbgprintf("MM: >> map_region_at_address (PD=%x) '%s' L%x => P%x (@%p)\n", page_directory, region.name.characters(), page_laddr, physical_page ? physical_page->paddr().get() : 0, physical_page.ptr());
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#endif
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}
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}
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@ -369,8 +341,7 @@ void MemoryManager::remove_kernel_alias_for_region(Region& region, byte* addr)
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bool MemoryManager::unmapRegion(Process& process, Region& region)
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{
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InterruptDisabler disabler;
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auto& zone = *region.zone;
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for (size_t i = 0; i < zone.m_pages.size(); ++i) {
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for (size_t i = 0; i < region.physical_pages.size(); ++i) {
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auto laddr = region.linearAddress.offset(i * PAGE_SIZE);
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auto pte = ensurePTE(process.m_page_directory, laddr);
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pte.setPhysicalPageBase(0);
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@ -379,7 +350,8 @@ bool MemoryManager::unmapRegion(Process& process, Region& region)
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pte.setUserAllowed(false);
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flushTLB(laddr);
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#ifdef MM_DEBUG
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//dbgprintf("MM: >> Unmapped L%x => P%x <<\n", laddr, zone.m_pages[i].get());
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auto& physical_page = region.physical_pages[i];
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dbgprintf("MM: >> Unmapped L%x => P%x <<\n", laddr, physical_page ? physical_page->paddr().get() : 0);
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#endif
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}
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return true;
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@ -429,12 +401,12 @@ RetainPtr<Region> Region::clone()
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KernelPagingScope pagingScope;
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if (is_readable && !is_writable) {
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// Create a new region backed by the same zone.
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return adopt(*new Region(linearAddress, size, zone.copyRef(), String(name), is_readable, is_writable));
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// Create a new region backed by the same physical pages.
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return adopt(*new Region(linearAddress, size, physical_pages, String(name), is_readable, is_writable));
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}
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// FIXME: Implement COW regions.
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auto clone_zone = MM.createZone(zone->size());
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auto clone_region = adopt(*new Region(linearAddress, size, move(clone_zone), String(name), is_readable, is_writable));
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auto clone_physical_pages = MM.allocate_physical_pages(physical_pages.size());
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auto clone_region = adopt(*new Region(linearAddress, size, move(clone_physical_pages), String(name), is_readable, is_writable));
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// FIXME: It would be cool to make the src_alias a read-only mapping.
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byte* src_alias = MM.create_kernel_alias_for_region(*this);
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@ -447,3 +419,26 @@ RetainPtr<Region> Region::clone()
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return clone_region;
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}
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Region::Region(LinearAddress a, size_t s, Vector<RetainPtr<PhysicalPage>> pp, String&& n, bool r, bool w)
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: linearAddress(a)
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, size(s)
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, physical_pages(move(pp))
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, name(move(n))
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, is_readable(r)
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, is_writable(w)
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{
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}
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Region::~Region()
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{
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}
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void PhysicalPage::return_to_freelist()
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{
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InterruptDisabler disabler;
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m_retain_count = 1;
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MM.m_free_physical_pages.append(adopt(*this));
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#ifdef MM_DEBUG
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dbgprintf("MM: P%x released to freelist\n", m_paddr.get());
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#endif
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}
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@ -17,34 +17,50 @@ enum class PageFaultResponse {
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Continue,
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};
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struct PageDirectory {
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dword entries[1024];
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PhysicalAddress physical_addresses[1024];
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};
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struct Zone : public Retainable<Zone> {
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friend ByteBuffer procfs$mm();
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class PhysicalPage {
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friend class MemoryManager;
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public:
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~Zone();
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size_t size() const { return m_pages.size() * PAGE_SIZE; }
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~PhysicalPage() { }
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PhysicalAddress paddr() const { return m_paddr; }
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const Vector<PhysicalAddress>& pages() const { return m_pages; }
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void retain()
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{
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ASSERT(m_retain_count);
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++m_retain_count;
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}
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void release()
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{
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ASSERT(m_retain_count);
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if (!--m_retain_count)
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return_to_freelist();
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}
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private:
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friend class MemoryManager;
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explicit Zone(Vector<PhysicalAddress>&&);
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PhysicalPage(PhysicalAddress paddr)
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: m_paddr(paddr)
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{
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}
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Vector<PhysicalAddress> m_pages;
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void return_to_freelist();
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unsigned m_retain_count { 1 };
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PhysicalAddress m_paddr;
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};
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struct PageDirectory {
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dword entries[1024];
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RetainPtr<PhysicalPage> physical_pages[1024];
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};
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struct Region : public Retainable<Region> {
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Region(LinearAddress, size_t, RetainPtr<Zone>&&, String&&, bool r, bool w);
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Region(LinearAddress, size_t, Vector<RetainPtr<PhysicalPage>>, String&&, bool r, bool w);
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~Region();
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RetainPtr<Region> clone();
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LinearAddress linearAddress;
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size_t size { 0 };
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RetainPtr<Zone> zone;
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Vector<RetainPtr<PhysicalPage>> physical_pages;
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String name;
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bool is_readable { true };
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bool is_writable { true };
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@ -54,6 +70,7 @@ struct Region : public Retainable<Region> {
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class MemoryManager {
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AK_MAKE_ETERNAL
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friend class PhysicalPage;
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friend ByteBuffer procfs$mm();
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public:
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static MemoryManager& the() PURE;
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@ -64,14 +81,9 @@ public:
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PageFaultResponse handlePageFault(const PageFault&);
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RetainPtr<Zone> createZone(size_t);
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bool mapRegion(Process&, Region&);
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bool unmapRegion(Process&, Region&);
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void registerZone(Zone&);
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void unregisterZone(Zone&);
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void populate_page_directory(PageDirectory&);
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void release_page_directory(PageDirectory&);
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@ -84,6 +96,8 @@ public:
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bool validate_user_read(const Process&, LinearAddress) const;
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bool validate_user_write(const Process&, LinearAddress) const;
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Vector<RetainPtr<PhysicalPage>> allocate_physical_pages(size_t count);
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private:
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MemoryManager();
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~MemoryManager();
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@ -96,16 +110,14 @@ private:
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void flushEntireTLB();
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void flushTLB(LinearAddress);
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PhysicalAddress allocate_page_table();
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void deallocate_page_table(PhysicalAddress);
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RetainPtr<PhysicalPage> allocate_page_table(PageDirectory&, unsigned index);
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void deallocate_page_table(PageDirectory&, unsigned index);
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void protectMap(LinearAddress, size_t length);
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void create_identity_mapping(LinearAddress, size_t length);
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void remove_identity_mapping(LinearAddress, size_t);
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Vector<PhysicalAddress> allocatePhysicalPages(size_t count);
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struct PageDirectoryEntry {
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explicit PageDirectoryEntry(dword* pde) : m_pde(pde) { }
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@ -192,9 +204,7 @@ private:
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LinearAddress m_next_laddr;
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HashTable<Zone*> m_zones;
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Vector<PhysicalAddress> m_freePages;
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Vector<RetainPtr<PhysicalPage>> m_free_physical_pages;
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};
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||||
|
||||
struct KernelPagingScope {
|
||||
|
@ -49,7 +49,7 @@ ByteBuffer procfs$pid_vm(Process& process)
|
||||
{
|
||||
ProcessInspectionScope scope(process);
|
||||
char* buffer;
|
||||
auto stringImpl = StringImpl::createUninitialized(80 + process.regionCount() * 80, buffer);
|
||||
auto stringImpl = StringImpl::createUninitialized(80 + process.regionCount() * 80 + 4096, buffer);
|
||||
memset(buffer, 0, stringImpl->length());
|
||||
char* ptr = buffer;
|
||||
ptr += ksprintf(ptr, "BEGIN END SIZE NAME\n");
|
||||
@ -59,6 +59,10 @@ ByteBuffer procfs$pid_vm(Process& process)
|
||||
region->linearAddress.offset(region->size - 1).get(),
|
||||
region->size,
|
||||
region->name.characters());
|
||||
for (auto& physical_page : region->physical_pages) {
|
||||
ptr += ksprintf(ptr, "P%x ", physical_page ? physical_page->paddr().get() : 0);
|
||||
}
|
||||
ptr += ksprintf(ptr, "\n");
|
||||
}
|
||||
*ptr = '\0';
|
||||
return ByteBuffer::copy((byte*)buffer, ptr - buffer);
|
||||
@ -130,6 +134,8 @@ void ProcFileSystem::removeProcess(Process& process)
|
||||
|
||||
ByteBuffer procfs$mm()
|
||||
{
|
||||
// FIXME: Implement
|
||||
#if 0
|
||||
InterruptDisabler disabler;
|
||||
size_t zonePageCount = 0;
|
||||
for (auto* zone : MM.m_zones)
|
||||
@ -143,9 +149,11 @@ ByteBuffer procfs$mm()
|
||||
ptr += ksprintf(ptr, "\n");
|
||||
}
|
||||
ptr += ksprintf(ptr, "Zone count: %u\n", MM.m_zones.size());
|
||||
ptr += ksprintf(ptr, "Free physical pages: %u\n", MM.m_freePages.size());
|
||||
ptr += ksprintf(ptr, "Free physical pages: %u\n", MM.m_free_physical_pages.size());
|
||||
buffer.trim(ptr - (char*)buffer.pointer());
|
||||
return buffer;
|
||||
#endif
|
||||
return { };
|
||||
}
|
||||
|
||||
|
||||
|
@ -17,6 +17,7 @@
|
||||
|
||||
//#define DEBUG_IO
|
||||
//#define TASK_DEBUG
|
||||
//#define FORK_DEBUG
|
||||
//#define SCHEDULER_DEBUG
|
||||
|
||||
// FIXME: Only do a single validation for accesses that don't span multiple pages.
|
||||
@ -144,11 +145,11 @@ Region* Process::allocate_region(LinearAddress laddr, size_t size, String&& name
|
||||
|
||||
laddr.mask(0xfffff000);
|
||||
|
||||
auto zone = MM.createZone(size);
|
||||
ASSERT(zone);
|
||||
|
||||
m_regions.append(adopt(*new Region(laddr, size, move(zone), move(name), is_readable, is_writable)));
|
||||
unsigned page_count = ceilDiv(size, PAGE_SIZE);
|
||||
auto physical_pages = MM.allocate_physical_pages(page_count);
|
||||
ASSERT(physical_pages.size() == page_count);
|
||||
|
||||
m_regions.append(adopt(*new Region(laddr, size, move(physical_pages), move(name), is_readable, is_writable)));
|
||||
MM.mapRegion(*this, *m_regions.last());
|
||||
return m_regions.last().ptr();
|
||||
}
|
||||
@ -1258,20 +1259,6 @@ Process* Process::kernelProcess()
|
||||
return s_kernelProcess;
|
||||
}
|
||||
|
||||
Region::Region(LinearAddress a, size_t s, RetainPtr<Zone>&& z, String&& n, bool r, bool w)
|
||||
: linearAddress(a)
|
||||
, size(s)
|
||||
, zone(move(z))
|
||||
, name(move(n))
|
||||
, is_readable(r)
|
||||
, is_writable(w)
|
||||
{
|
||||
}
|
||||
|
||||
Region::~Region()
|
||||
{
|
||||
}
|
||||
|
||||
bool Process::isValidAddressForKernel(LinearAddress laddr) const
|
||||
{
|
||||
// We check extra carefully here since the first 4MB of the address space is identity-mapped.
|
||||
|
@ -318,7 +318,7 @@ void gdt_init()
|
||||
s_gdt_freelist = new Vector<word, KmallocEternalAllocator>();
|
||||
s_gdt_freelist->ensureCapacity(256);
|
||||
for (size_t i = s_gdtLength; i < 256; ++i)
|
||||
s_gdt_freelist->uncheckedAppend(i * 8);
|
||||
s_gdt_freelist->unchecked_append(i * 8);
|
||||
|
||||
s_gdtLength = 256;
|
||||
s_gdtr.address = s_gdt;
|
||||
|
@ -19,6 +19,7 @@ cp ../Userland/uname mnt/bin/uname
|
||||
cp ../Userland/clear mnt/bin/clear
|
||||
cp ../Userland/tst mnt/bin/tst
|
||||
cp ../Userland/ft mnt/bin/ft
|
||||
cp ../Userland/ft2 mnt/bin/ft2
|
||||
cp ../Userland/mm mnt/bin/mm
|
||||
cp ../Userland/kill mnt/bin/kill
|
||||
cp ../Userland/tty mnt/bin/tty
|
||||
|
1
Userland/.gitignore
vendored
1
Userland/.gitignore
vendored
@ -17,3 +17,4 @@ mm
|
||||
kill
|
||||
tty
|
||||
ft
|
||||
ft2
|
||||
|
16
Userland/ft2.cpp
Normal file
16
Userland/ft2.cpp
Normal file
@ -0,0 +1,16 @@
|
||||
#include <stdio.h>
|
||||
#include <unistd.h>
|
||||
|
||||
int main(int argc, char** argv)
|
||||
{
|
||||
printf("Testing fork()...\n");
|
||||
pid_t pid = fork();
|
||||
if (!pid) {
|
||||
printf("child, pid=%d\n", getpid());
|
||||
for (;;);
|
||||
} else {
|
||||
printf("parent, child pid=%d\n", pid);
|
||||
for (;;);
|
||||
}
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue
Block a user