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https://github.com/RGBCube/serenity
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02e21de20a
Since the kernel page directory is inherited by all other page directories, we should always flush the TLB when it's updated.
37 lines
1.1 KiB
C++
37 lines
1.1 KiB
C++
#include <Kernel/VM/PageDirectory.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/Process.h>
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#include <Kernel/Thread.h>
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static const dword userspace_range_base = 0x01000000;
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static const dword kernelspace_range_base = 0xc0000000;
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PageDirectory::PageDirectory(PhysicalAddress paddr)
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: m_range_allocator(LinearAddress(0xc0000000), 0x3f000000)
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{
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m_directory_page = PhysicalPage::create_eternal(paddr, true);
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}
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PageDirectory::PageDirectory(const RangeAllocator* parent_range_allocator)
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: m_range_allocator(parent_range_allocator ? RangeAllocator(*parent_range_allocator) : RangeAllocator(LinearAddress(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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}
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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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}
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void PageDirectory::flush(LinearAddress laddr)
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{
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#ifdef MM_DEBUG
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dbgprintf("MM: Flush page L%x\n", laddr.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(laddr);
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}
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