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Kernel: Move end_of_kernel_image after the .ksyms section

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Without this we won't be able to detect whether .ksyms overlaps the end
of the page table we set up for the kernel image.
This commit is contained in:
Gunnar Beutner 2021-07-16 09:50:34 +02:00 • committed by Andreas Kling
parent acf8f2a2a3
commit cbdb488578
5 changed files with 38 additions and 5 deletions
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23
Kernel/VM/MemoryManager.cpp
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@ -31,6 +31,8 @@ extern FlatPtr start_of_ro_after_init;
extern FlatPtr end_of_ro_after_init;
extern FlatPtr start_of_unmap_after_init;
extern FlatPtr end_of_unmap_after_init;
extern FlatPtr start_of_kernel_ksyms;
extern FlatPtr end_of_kernel_ksyms;
extern multiboot_module_entry_t multiboot_copy_boot_modules_array[16];
extern size_t multiboot_copy_boot_modules_count;
@ -114,7 +116,7 @@ UNMAP_AFTER_INIT void MemoryManager::protect_readonly_after_init_memory()
}
}
void MemoryManager::unmap_memory_after_init()
void MemoryManager::unmap_text_after_init()
{
ScopedSpinLock mm_lock(s_mm_lock);
ScopedSpinLock page_lock(kernel_page_directory().get_lock());
@ -130,7 +132,24 @@ void MemoryManager::unmap_memory_after_init()
}
dmesgln("Unmapped {} KiB of kernel text after init! :^)", (end - start) / KiB);
//Processor::halt();
}
void MemoryManager::unmap_ksyms_after_init()
{
ScopedSpinLock mm_lock(s_mm_lock);
ScopedSpinLock page_lock(kernel_page_directory().get_lock());
auto start = page_round_down((FlatPtr)&start_of_kernel_ksyms);
auto end = page_round_up((FlatPtr)&end_of_kernel_ksyms);
// Unmap the entire .ksyms section
for (auto i = start; i < end; i += PAGE_SIZE) {
auto& pte = *ensure_pte(kernel_page_directory(), VirtualAddress(i));
pte.clear();
flush_tlb(&kernel_page_directory(), VirtualAddress(i));
}
dmesgln("Unmapped {} KiB of kernel symbols after init! :^)", (end - start) / KiB);
}
UNMAP_AFTER_INIT void MemoryManager::register_reserved_ranges()