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2ad963d261
This allows the page fault code to find the owning PageDirectory and corresponding process for faulting regions. The mapping is implemented as a global hash map right now, which is definitely not optimal. We can come up with something better when it becomes necessary.
60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
#include <Kernel/Process.h>
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#include <Kernel/Thread.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/PageDirectory.h>
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static const u32 userspace_range_base = 0x01000000;
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static const u32 kernelspace_range_base = 0xc0000000;
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static HashMap<u32, PageDirectory*>& pdb_map()
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{
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ASSERT_INTERRUPTS_DISABLED();
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static HashMap<u32, PageDirectory*>* map;
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if (!map)
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map = new HashMap<u32, PageDirectory*>;
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return *map;
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}
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RefPtr<PageDirectory> PageDirectory::find_by_pdb(u32 pdb)
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{
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InterruptDisabler disabler;
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return pdb_map().get(pdb).value_or({});
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}
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PageDirectory::PageDirectory(PhysicalAddress paddr)
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: m_range_allocator(VirtualAddress(0xc0000000), 0x3f000000)
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{
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m_directory_page = PhysicalPage::create(paddr, true, false);
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InterruptDisabler disabler;
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pdb_map().set(m_directory_page->paddr().get(), this);
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}
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PageDirectory::PageDirectory(Process& process, const RangeAllocator* parent_range_allocator)
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: m_process(&process)
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, m_range_allocator(parent_range_allocator ? RangeAllocator(*parent_range_allocator) : RangeAllocator(VirtualAddress(userspace_range_base), kernelspace_range_base - userspace_range_base))
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{
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MM.populate_page_directory(*this);
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InterruptDisabler disabler;
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pdb_map().set(m_directory_page->paddr().get(), this);
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}
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PageDirectory::~PageDirectory()
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{
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#ifdef MM_DEBUG
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dbgprintf("MM: ~PageDirectory K%x\n", this);
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#endif
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InterruptDisabler disabler;
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pdb_map().remove(m_directory_page->paddr().get());
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}
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void PageDirectory::flush(VirtualAddress vaddr)
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{
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#ifdef MM_DEBUG
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dbgprintf("MM: Flush page L%x\n", vaddr.get());
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#endif
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if (!current)
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return;
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if (this == &MM.kernel_page_directory() || ¤t->process().page_directory() == this)
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MM.flush_tlb(vaddr);
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}
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