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Kernel: Make identity mapping mechanism used during AP boot non-generic

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When booting AP's, we identity map a region at 0x8000 while doing the
initial bringup sequence. This is the only thing in the kernel that
requires an identity mapping, yet we had a bunch of generic API's and a
dedicated VirtualRangeAllocator in every PageDirectory for this purpose.

This patch simplifies the situation by moving the identity mapping logic
to the AP boot code and removing the generic API's.
This commit is contained in:
Andreas Kling 2021-08-06 21:35:56 +02:00
parent 16ac3bbfd7
commit cdab5b2091
6 changed files with 20 additions and 23 deletions
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1
Kernel/Memory/PageDirectory.cpp
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@ -38,7 +38,6 @@ UNMAP_AFTER_INIT NonnullRefPtr<PageDirectory> PageDirectory::must_create_kernel_
// make sure this starts in a new page directory to make MemoryManager::initialize_physical_pages() happy
FlatPtr start_of_range = ((FlatPtr)end_of_kernel_image & ~(FlatPtr)0x1fffff) + 0x200000;
directory->m_range_allocator.initialize_with_range(VirtualAddress(start_of_range), KERNEL_PD_END - start_of_range);
directory->m_identity_range_allocator.initialize_with_range(VirtualAddress(FlatPtr(0x00000000)), 0x00200000);
return directory;
}