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Kernel: Make the loop that marks the bottom 1MB NX a little less busy

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This commit is contained in:
Andreas Kling 2020-01-02 22:01:27 +01:00
parent 2a4a19aed8
commit 0f9800ca57
1 changed files with 4 additions and 3 deletions
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7
Kernel/VM/MemoryManager.cpp
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@ -63,10 +63,11 @@ void MemoryManager::initialize_paging()
create_identity_mapping(kernel_page_directory(), VirtualAddress(PAGE_SIZE), (8 * MB) - PAGE_SIZE);
// Disable execution from 0MB through 1MB (BIOS data, legacy things, ...)
for (size_t i = 0; i < (1 * MB); ++i) {
auto& pte = ensure_pte(kernel_page_directory(), VirtualAddress(i));
if (g_cpu_supports_nx)
if (g_cpu_supports_nx) {
for (size_t i = 0; i < (1 * MB); i += PAGE_SIZE) {
auto& pte = ensure_pte(kernel_page_directory(), VirtualAddress(i));
pte.set_execute_disabled(true);
}
}
// Disable execution from 2MB through 8MB (kmalloc, kmalloc_eternal, slabs, page tables, ...)