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Kernel: Unmap Prekernel pages after they are no longer needed

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The Prekernel's memory is only accessed until MemoryManager has been
initialized. Keeping them around afterwards is both unnecessary and bad,
as it prevents the userland from using the 0x100000-0x155000 virtual
address range.

Co-authored-by: Idan Horowitz <idan.horowitz@gmail.com>
This commit is contained in:
Daniel Bertalan 2021-12-19 01:15:12 +01:00 • committed by Brian Gianforcaro
commit 4fc28bfe02
Notes: sideshowbarker 2024-07-17 22:23:21 +09:00
4 changed files with 31 additions and 8 deletions
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2
Kernel/Memory/Region.cpp
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@ -243,7 +243,7 @@ void Region::unmap(ShouldDeallocateVirtualRange deallocate_range)
size_t count = page_count();
for (size_t i = 0; i < count; ++i) {
auto vaddr = vaddr_from_page_index(i);
MM.release_pte(*m_page_directory, vaddr, i == count - 1);
MM.release_pte(*m_page_directory, vaddr, i == count - 1 ? MemoryManager::IsLastPTERelease::Yes : MemoryManager::IsLastPTERelease::No);
}
MemoryManager::flush_tlb(m_page_directory, vaddr(), page_count());
if (deallocate_range == ShouldDeallocateVirtualRange::Yes) {