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Kernel: Support loading the kernel at almost arbitrary virtual addresses
This enables further work on implementing KASLR by adding relocation support to the pre-kernel and updating the kernel to be less dependent on specific virtual memory layouts.
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57417a3d6e
20 changed files with 123 additions and 87 deletions
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@ -51,7 +51,7 @@ UNMAP_AFTER_INIT void PageDirectory::allocate_kernel_directory()
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dmesgln("MM: boot_pd_kernel @ {}", boot_pd_kernel);
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m_directory_table = PhysicalPage::create(boot_pdpt, MayReturnToFreeList::No);
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m_directory_pages[0] = PhysicalPage::create(boot_pd0, MayReturnToFreeList::No);
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m_directory_pages[(kernel_base >> 30) & 0x1ff] = PhysicalPage::create(boot_pd_kernel, MayReturnToFreeList::No);
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m_directory_pages[(kernel_mapping_base >> 30) & 0x1ff] = PhysicalPage::create(boot_pd_kernel, MayReturnToFreeList::No);
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}
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PageDirectory::PageDirectory(const RangeAllocator* parent_range_allocator)
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@ -77,13 +77,13 @@ PageDirectory::PageDirectory(const RangeAllocator* parent_range_allocator)
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m_directory_table = MM.allocate_user_physical_page();
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if (!m_directory_table)
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return;
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auto kernel_pd_index = (kernel_base >> 30) & 0x1ffu;
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auto kernel_pd_index = (kernel_mapping_base >> 30) & 0x1ffu;
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for (size_t i = 0; i < kernel_pd_index; i++) {
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m_directory_pages[i] = MM.allocate_user_physical_page();
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if (!m_directory_pages[i])
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return;
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}
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// Share the top 1 GiB of kernel-only mappings (>=kernel_base)
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// Share the top 1 GiB of kernel-only mappings (>=kernel_mapping_base)
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m_directory_pages[kernel_pd_index] = MM.kernel_page_directory().m_directory_pages[kernel_pd_index];
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#if ARCH(X86_64)
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