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Kernel: Move PhysicalPage classes out of the heap into an array

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By moving the PhysicalPage classes out of the kernel heap into a static
array, one for each physical page, we can avoid the added overhead and
easily find them by indexing into an array.

This also wraps the PhysicalPage into a PhysicalPageEntry, which allows
us to re-use each slot with information where to find the next free
page.
This commit is contained in:
Tom 2021-07-07 19:50:05 -06:00 • committed by Andreas Kling
parent ad5d9d648b
commit 87dc4c3d2c
11 changed files with 285 additions and 43 deletions
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5
Kernel/VM/PageDirectory.cpp
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@ -37,9 +37,12 @@ extern "C" PageDirectoryEntry boot_pd3[1024];
UNMAP_AFTER_INIT PageDirectory::PageDirectory()
{
m_range_allocator.initialize_with_range(VirtualAddress(KERNEL_BASE + 0x02000000), 0x2f000000);
m_range_allocator.initialize_with_range(VirtualAddress(KERNEL_BASE + KERNEL_PD_OFFSET), KERNEL_PD_END - (KERNEL_BASE + KERNEL_PD_OFFSET));
m_identity_range_allocator.initialize_with_range(VirtualAddress(FlatPtr(0x00000000)), 0x00200000);
}
UNMAP_AFTER_INIT void PageDirectory::allocate_kernel_directory()
{
// Adopt the page tables already set up by boot.S
#if ARCH(X86_64)
PhysicalAddress boot_pml4t_paddr(virtual_to_low_physical((FlatPtr)boot_pml4t));