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Kernel: Remove "supervisor" bit from PhysicalPage

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Instead of each PhysicalPage knowing whether it comes from the
supervisor pages or from the user pages, we can just check in both
sets when freeing a page.

It's just a handful of pointer range checks, nothing expensive.
This commit is contained in:
Andreas Kling 2021-07-11 23:12:32 +02:00
parent ac78f1e812
commit c2792212f4
9 changed files with 39 additions and 53 deletions
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8
Kernel/VM/PageDirectory.cpp
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@ -47,7 +47,7 @@ UNMAP_AFTER_INIT void PageDirectory::allocate_kernel_directory()
#if ARCH(X86_64)
PhysicalAddress boot_pml4t_paddr(virtual_to_low_physical((FlatPtr)boot_pml4t));
dmesgln("MM: boot_pml4t @ {}", boot_pml4t_paddr);
m_pml4t = PhysicalPage::create(boot_pml4t_paddr, true, false);
m_pml4t = PhysicalPage::create(boot_pml4t_paddr, false);
#endif
PhysicalAddress boot_pdpt_paddr(virtual_to_low_physical((FlatPtr)boot_pdpt));
PhysicalAddress boot_pd0_paddr(virtual_to_low_physical((FlatPtr)boot_pd0));
@ -55,9 +55,9 @@ UNMAP_AFTER_INIT void PageDirectory::allocate_kernel_directory()
dmesgln("MM: boot_pdpt @ {}", boot_pdpt_paddr);
dmesgln("MM: boot_pd0 @ {}", boot_pd0_paddr);
dmesgln("MM: boot_pd3 @ {}", boot_pd3_paddr);
m_directory_table = PhysicalPage::create(boot_pdpt_paddr, true, false);
m_directory_pages[0] = PhysicalPage::create(boot_pd0_paddr, true, false);
m_directory_pages[3] = PhysicalPage::create(boot_pd3_paddr, true, false);
m_directory_table = PhysicalPage::create(boot_pdpt_paddr, false);
m_directory_pages[0] = PhysicalPage::create(boot_pd0_paddr, false);
m_directory_pages[3] = PhysicalPage::create(boot_pd3_paddr, false);
}
PageDirectory::PageDirectory(const RangeAllocator* parent_range_allocator)