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Free physical pages allocated for a process's page directory on exit.

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Also use a ProcessPagingScope instead of region aliasing to implement
create-process ELF loading.
This commit is contained in:
Andreas Kling 2018-11-01 23:04:34 +01:00
parent c70afd045e
commit 90ddbca127
8 changed files with 113 additions and 55 deletions
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22
Kernel/MemoryManager.h
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@ -17,6 +17,11 @@ enum class PageFaultResponse {
Continue,
};
struct PageDirectory {
dword entries[1024];
PhysicalAddress physical_addresses[1024];
};
struct Zone : public Retainable<Zone> {
friend ByteBuffer procfs$mm();
public:
@ -78,6 +83,7 @@ public:
void unregisterZone(Zone&);
void populate_page_directory(Process&);
void release_page_directory(Process&);
byte* create_kernel_alias_for_region(Region&);
void remove_kernel_alias_for_region(Region&, byte*);
@ -93,14 +99,14 @@ private:
~MemoryManager();
LinearAddress allocate_linear_address_range(size_t);
void map_region_at_address(dword* page_directory, Region&, LinearAddress, bool user_accessible);
void unmap_range(dword* page_directory, LinearAddress, size_t);
void map_region_at_address(PageDirectory*, Region&, LinearAddress, bool user_accessible);
void unmap_range(PageDirectory*, LinearAddress, size_t);
void initializePaging();
void flushEntireTLB();
void flushTLB(LinearAddress);
void* allocatePageTable();
void* allocate_page_table();
void protectMap(LinearAddress, size_t length);
void identityMap(LinearAddress, size_t length);
@ -185,9 +191,9 @@ private:
dword* m_pte;
};
PageTableEntry ensurePTE(dword* pageDirectory, LinearAddress);
PageTableEntry ensurePTE(PageDirectory*, LinearAddress);
dword* m_kernel_page_directory;
PageDirectory* m_kernel_page_directory;
dword* m_pageTableZero;
dword* m_pageTableOne;
@ -203,7 +209,7 @@ struct KernelPagingScope {
~KernelPagingScope() { MM.enter_process_paging_scope(*current); }
};
struct OtherProcessPagingScope {
OtherProcessPagingScope(Process& process) { MM.enter_process_paging_scope(process); }
~OtherProcessPagingScope() { MM.enter_process_paging_scope(*current); }
struct ProcessPagingScope {
ProcessPagingScope(Process& process) { MM.enter_process_paging_scope(process); }
~ProcessPagingScope() { MM.enter_process_paging_scope(*current); }
};