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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
parent 2f1b4b8a81
commit 4fc28bfe02
4 changed files with 31 additions and 8 deletions
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2
Kernel/init.cpp
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@ -193,6 +193,8 @@ extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
CommandLine::initialize();
Memory::MemoryManager::initialize(0);
MM.unmap_prekernel();
// Ensure that the safemem sections are not empty. This could happen if the linker accidentally discards the sections.
VERIFY(+start_of_safemem_text != +end_of_safemem_text);
VERIFY(+start_of_safemem_atomic_text != +end_of_safemem_atomic_text);