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https://github.com/RGBCube/serenity
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Kernel: Move VM-related files into Kernel/VM/.
Also break MemoryManager.{cpp,h} into one file per class.
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21 changed files with 630 additions and 575 deletions
227
Kernel/VM/MemoryManager.h
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227
Kernel/VM/MemoryManager.h
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#pragma once
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#include "types.h"
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#include "i386.h"
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#include <AK/Bitmap.h>
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#include <AK/ByteBuffer.h>
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#include <AK/Retainable.h>
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#include <AK/RetainPtr.h>
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#include <AK/Vector.h>
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#include <AK/HashTable.h>
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#include <AK/AKString.h>
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#include <AK/Badge.h>
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#include <AK/Weakable.h>
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#include <Kernel/VM/PhysicalPage.h>
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#include <Kernel/VM/Region.h>
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#include <Kernel/VM/VMObject.h>
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#include <Kernel/FileSystem/InodeIdentifier.h>
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#define PAGE_ROUND_UP(x) ((((dword)(x)) + PAGE_SIZE-1) & (~(PAGE_SIZE-1)))
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class SynthFSInode;
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enum class PageFaultResponse {
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ShouldCrash,
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Continue,
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};
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#define MM MemoryManager::the()
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class MemoryManager {
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AK_MAKE_ETERNAL
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friend class PageDirectory;
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friend class PhysicalPage;
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friend class Region;
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friend class VMObject;
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friend ByteBuffer procfs$mm(InodeIdentifier);
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friend ByteBuffer procfs$memstat(InodeIdentifier);
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public:
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[[gnu::pure]] static MemoryManager& the();
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static void initialize();
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PageFaultResponse handle_page_fault(const PageFault&);
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bool map_region(Process&, Region&);
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bool unmap_region(Region&);
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void populate_page_directory(PageDirectory&);
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void enter_process_paging_scope(Process&);
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void enter_kernel_paging_scope();
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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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enum class ShouldZeroFill { No, Yes };
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RetainPtr<PhysicalPage> allocate_physical_page(ShouldZeroFill);
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RetainPtr<PhysicalPage> allocate_supervisor_physical_page();
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void remap_region(PageDirectory&, Region&);
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size_t ram_size() const { return m_ram_size; }
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int user_physical_pages_in_existence() const { return s_user_physical_pages_in_existence; }
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int super_physical_pages_in_existence() const { return s_super_physical_pages_in_existence; }
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void map_for_kernel(LinearAddress, PhysicalAddress);
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private:
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MemoryManager();
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~MemoryManager();
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void register_vmo(VMObject&);
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void unregister_vmo(VMObject&);
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void register_region(Region&);
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void unregister_region(Region&);
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void map_region_at_address(PageDirectory&, Region&, LinearAddress, bool user_accessible);
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void remap_region_page(Region&, unsigned page_index_in_region, bool user_allowed);
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void initialize_paging();
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void flush_entire_tlb();
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void flush_tlb(LinearAddress);
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RetainPtr<PhysicalPage> allocate_page_table(PageDirectory&, unsigned index);
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void map_protected(LinearAddress, size_t length);
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void create_identity_mapping(PageDirectory&, LinearAddress, size_t length);
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void remove_identity_mapping(PageDirectory&, LinearAddress, size_t);
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static Region* region_from_laddr(Process&, LinearAddress);
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static const Region* region_from_laddr(const Process&, LinearAddress);
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bool copy_on_write(Region&, unsigned page_index_in_region);
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bool page_in_from_inode(Region&, unsigned page_index_in_region);
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bool zero_page(Region& region, unsigned page_index_in_region);
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byte* quickmap_page(PhysicalPage&);
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void unquickmap_page();
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PageDirectory& kernel_page_directory() { return *m_kernel_page_directory; }
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struct PageDirectoryEntry {
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explicit PageDirectoryEntry(dword* pde) : m_pde(pde) { }
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dword* page_table_base() { return reinterpret_cast<dword*>(raw() & 0xfffff000u); }
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void set_page_table_base(dword value)
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{
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*m_pde &= 0xfff;
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*m_pde |= value & 0xfffff000;
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}
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dword raw() const { return *m_pde; }
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dword* ptr() { return m_pde; }
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enum Flags {
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Present = 1 << 0,
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ReadWrite = 1 << 1,
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UserSupervisor = 1 << 2,
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WriteThrough = 1 << 3,
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CacheDisabled = 1 << 4,
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};
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bool is_present() const { return raw() & Present; }
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void set_present(bool b) { set_bit(Present, b); }
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bool is_user_allowed() const { return raw() & UserSupervisor; }
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void set_user_allowed(bool b) { set_bit(UserSupervisor, b); }
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bool is_writable() const { return raw() & ReadWrite; }
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void set_writable(bool b) { set_bit(ReadWrite, b); }
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bool is_write_through() const { return raw() & WriteThrough; }
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void set_write_through(bool b) { set_bit(WriteThrough, b); }
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bool is_cache_disabled() const { return raw() & CacheDisabled; }
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void set_cache_disabled(bool b) { set_bit(CacheDisabled, b); }
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void set_bit(byte bit, bool value)
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{
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if (value)
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*m_pde |= bit;
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else
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*m_pde &= ~bit;
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}
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dword* m_pde;
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};
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struct PageTableEntry {
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explicit PageTableEntry(dword* pte) : m_pte(pte) { }
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dword* physical_page_base() { return reinterpret_cast<dword*>(raw() & 0xfffff000u); }
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void set_physical_page_base(dword value)
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{
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*m_pte &= 0xfffu;
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*m_pte |= value & 0xfffff000u;
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}
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dword raw() const { return *m_pte; }
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dword* ptr() { return m_pte; }
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enum Flags {
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Present = 1 << 0,
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ReadWrite = 1 << 1,
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UserSupervisor = 1 << 2,
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WriteThrough = 1 << 3,
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CacheDisabled = 1 << 4,
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};
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bool is_present() const { return raw() & Present; }
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void set_present(bool b) { set_bit(Present, b); }
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bool is_user_allowed() const { return raw() & UserSupervisor; }
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void set_user_allowed(bool b) { set_bit(UserSupervisor, b); }
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bool is_writable() const { return raw() & ReadWrite; }
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void set_writable(bool b) { set_bit(ReadWrite, b); }
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bool is_write_through() const { return raw() & WriteThrough; }
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void set_write_through(bool b) { set_bit(WriteThrough, b); }
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bool is_cache_disabled() const { return raw() & CacheDisabled; }
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void set_cache_disabled(bool b) { set_bit(CacheDisabled, b); }
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void set_bit(byte bit, bool value)
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{
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if (value)
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*m_pte |= bit;
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else
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*m_pte &= ~bit;
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}
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dword* m_pte;
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};
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static unsigned s_user_physical_pages_in_existence;
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static unsigned s_super_physical_pages_in_existence;
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PageTableEntry ensure_pte(PageDirectory&, LinearAddress);
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RetainPtr<PageDirectory> m_kernel_page_directory;
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dword* m_page_table_zero;
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LinearAddress m_quickmap_addr;
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Vector<Retained<PhysicalPage>> m_free_physical_pages;
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Vector<Retained<PhysicalPage>> m_free_supervisor_physical_pages;
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HashTable<VMObject*> m_vmos;
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HashTable<Region*> m_regions;
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size_t m_ram_size { 0 };
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bool m_quickmap_in_use { false };
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};
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struct ProcessPagingScope {
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ProcessPagingScope(Process&);
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~ProcessPagingScope();
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};
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struct KernelPagingScope {
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KernelPagingScope();
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~KernelPagingScope();
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};
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