From b9fdcc729c1875858297c0f3fb9d8e6feff71374 Mon Sep 17 00:00:00 2001 From: Fabian Imhof Date: Fri, 1 Nov 2024 14:29:58 +0000 Subject: implement temporary_page and update active/inactive page tables --- arch/x86_64/src/memory/paging/active_page_table.cpp | 10 ++++++++++ arch/x86_64/src/memory/paging/inactive_page_table.cpp | 10 ++++++++++ 2 files changed, 20 insertions(+) (limited to 'arch/x86_64/src/memory/paging') diff --git a/arch/x86_64/src/memory/paging/active_page_table.cpp b/arch/x86_64/src/memory/paging/active_page_table.cpp index 38696f8..5f31f75 100644 --- a/arch/x86_64/src/memory/paging/active_page_table.cpp +++ b/arch/x86_64/src/memory/paging/active_page_table.cpp @@ -93,4 +93,14 @@ namespace teachos::arch::memory::paging { // Nothing to do } + + auto active_page_table::with(inactive_page_table inactive_page_table, temporary_page temporary_page, + active_page_table::function f) -> void + { + active_handle[511].set_entry(inactive_page_table.page_table_level_4_frame, entry::PRESENT | entry::WRITABLE); + invalidate_page_cache(PAGE_TABLE_LEVEL_4_ADDRESS); + + f(*mapper); + } + } // namespace teachos::arch::memory::paging diff --git a/arch/x86_64/src/memory/paging/inactive_page_table.cpp b/arch/x86_64/src/memory/paging/inactive_page_table.cpp index 1f36aa3..afba1f0 100644 --- a/arch/x86_64/src/memory/paging/inactive_page_table.cpp +++ b/arch/x86_64/src/memory/paging/inactive_page_table.cpp @@ -2,4 +2,14 @@ namespace teachos::arch::memory::paging { + inactive_page_table::inactive_page_table(allocator::physical_frame frame, active_page_table active_page_table, + temporary_page temporary_page) + : page_table_level_4_frame{frame} + { + auto table = temporary_page.map_table_frame(page_table_level_4_frame, active_page_table); + table.zero_entries(); + table[511].set_entry(page_table_level_4_frame, entry::PRESENT | entry::WRITABLE); + + temporary_page.unmap(active_page_table); + } } // namespace teachos::arch::memory::paging -- cgit v1.2.3