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Kernel/aarch64: Keep track of root page table and kernel directory table

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Timon Kruiper 2023-01-24 19:22:41 +01:00 committed by Andreas Kling
parent 697c5ca5e5
commit d9946c8e89
Notes: sideshowbarker 2024-07-18 03:35:30 +09:00 
Author: https://github.com/FireFox317
Commit: https://github.com/SerenityOS/serenity/commit/d9946c8e89
Pull-request: https://github.com/SerenityOS/serenity/pull/16911
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/nico ✅
1 changed files with 17 additions and 0 deletions
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17
Kernel/Arch/aarch64/MMU.cpp
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@ -239,6 +239,17 @@ static u64* get_page_directory(u64* root_table, VirtualAddress virtual_addr)
return descriptor_to_pointer(level2_table[level1_idx]);
}
static u64* get_page_directory_table(u64* root_table, VirtualAddress virtual_addr)
{
u64 level0_idx = (virtual_addr.get() >> 39) & 0x1FF;
u64* level1_table = root_table;
if (level1_table[level0_idx] == 0)
return nullptr;
return descriptor_to_pointer(level1_table[level0_idx]);
}
static void setup_kernel_page_directory(u64* root_table)
{
auto kernel_page_directory = (PhysicalPtr)get_page_directory(root_table, VirtualAddress { *adjust_by_mapping_base(&kernel_mapping_base) });
@ -246,6 +257,12 @@ static void setup_kernel_page_directory(u64* root_table)
panic_without_mmu("Could not find kernel page directory!"sv);
*adjust_by_mapping_base(&boot_pd_kernel) = PhysicalAddress(kernel_page_directory);
// FIXME: Rename boot_pml4t to something architecture agnostic.
*adjust_by_mapping_base(&boot_pml4t) = PhysicalAddress((PhysicalPtr)root_table);
// FIXME: Rename to directory_table or similar
*adjust_by_mapping_base(&boot_pdpt) = PhysicalAddress((PhysicalPtr)get_page_directory_table(root_table, VirtualAddress { *adjust_by_mapping_base(&kernel_mapping_base) }));
}
void init_page_tables()