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Kernel/aarch64: Change MMU::kernel_virtual_range to high virtual memory

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This was previously hardcoded this to be the physical memory range,
since we identity mapped the memory, however we now run the kernel at
a high virtual memory address.

Also changes PageDirectory.h to store up-to 512 pages, as the code now
needs access to more than 4 pages.
This commit is contained in:
Timon Kruiper 2023-01-07 15:18:33 +01:00 committed by Linus Groh
parent 5db32ecbe1
commit 5e00bb0b9f
2 changed files with 2 additions and 7 deletions
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5
Kernel/Memory/MemoryManager.cpp
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@ -72,9 +72,8 @@ bool MemoryManager::is_initialized()
static UNMAP_AFTER_INIT VirtualRange kernel_virtual_range()
{
#if ARCH(AARCH64)
// NOTE: We currently identity map the kernel image for aarch64, so the kernel virtual range
// is the complete memory range.
return VirtualRange { VirtualAddress((FlatPtr)0), 0x3F000000 };
// NOTE: This is not the same as x86_64, because the aarch64 kernel currently doesn't use the pre-kernel.
return VirtualRange { VirtualAddress(kernel_mapping_base), KERNEL_PD_END - kernel_mapping_base };
#else
size_t kernel_range_start = kernel_mapping_base + 2 * MiB; // The first 2 MiB are used for mapping the pre-kernel
return VirtualRange { VirtualAddress(kernel_range_start), KERNEL_PD_END - kernel_range_start };

4
Kernel/Memory/PageDirectory.h
View file

@ -67,11 +67,7 @@ private:
RefPtr<PhysicalPage> m_pml4t;
#endif
RefPtr<PhysicalPage> m_directory_table;
#if ARCH(X86_64)
RefPtr<PhysicalPage> m_directory_pages[512];
#else
RefPtr<PhysicalPage> m_directory_pages[4];
#endif
RecursiveSpinlock<LockRank::None> m_lock {};
};