diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86_64/include/arch/memory/paging/page_mapper.hpp | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/x86_64/include/arch/memory/paging/page_mapper.hpp b/arch/x86_64/include/arch/memory/paging/page_mapper.hpp index 3590dda..4905e9e 100644 --- a/arch/x86_64/include/arch/memory/paging/page_mapper.hpp +++ b/arch/x86_64/include/arch/memory/paging/page_mapper.hpp @@ -9,6 +9,17 @@ namespace teachos::arch::memory::paging { + namespace + { + /** + * @brief Invalidates any translation lookaside buffer (TLB) entries into the page table the given entry is cotained + * in. See https://www.felixcloutier.com/x86/invlpg for more information int he used x86 instruction. + * + * @param entry Any entry into the page table we want to invalidate all cached entries in. + */ + auto invalidate_page_cache(entry * entry) -> void { asm volatile("invlpg (%0)" ::"r"(entry) : "memory"); } + } // namespace + /** * @brief Creates a single instance of the level 4 page table table and returns handle to it or alternatively returns * the previously created handle instead. The instance is owned by this method and is static, meaning it lives on for @@ -135,7 +146,7 @@ namespace teachos::arch::memory::paging exception_handling::assert(level1_frame.has_value(), "[Page Mapper] Attempted to unmap page, which has not been mapped previously"); level1_entry.set_unused(); - // TODO: Flush the translation lookaside buffer to clear the entry from cache as well. (mov cr3, cr3) + invalidate_page_cache(&level1_entry); // TODO: Deallocate and unmap level 1, 2, 3 page table entry if this was the last page in them. // TODO: Fix deallocate because it is not yet implemented. allocator.deallocate_frame(level1_frame.value()); |