Merge branch 'feat_memory_manager' into 'develop_sa'

Finish inital draft of Memory Manager

See merge request teachos/kernel!3

1 files changed, 53 insertions, 0 deletions

diff --git a/arch/x86_64/src/memory/main.cpp b/arch/x86_64/src/memory/main.cpp
new file mode 100644
index 0000000..b978319
--- /dev/null
+++ b/arch/x86_64/src/memory/main.cpp
@@ -0,0 +1,53 @@
+#include "arch/memory/main.hpp"
+
+#include "arch/exception_handling/assert.hpp"
+#include "arch/memory/allocator/area_frame_allocator.hpp"
+#include "arch/memory/cpu/control_register.hpp"
+#include "arch/memory/cpu/msr.hpp"
+#include "arch/memory/heap/concept.hpp"
+#include "arch/memory/paging/active_page_table.hpp"
+#include "arch/memory/paging/kernel_mapper.hpp"
+
+namespace teachos::arch::memory
+{
+  namespace
+  {
+    auto remap_heap(allocator::area_frame_allocator allocator, paging::active_page_table & active_table) -> void
+    {
+      auto const start_page = paging::virtual_page::containing_address(memory::heap::HEAP_START);
+      auto const end_page =
+          ++(paging::virtual_page::containing_address(memory::heap::HEAP_START + memory::heap::HEAP_SIZE - 1));
+      paging::page_container::iterator const begin{start_page};
+      paging::page_container::iterator const end{end_page};
+      paging::page_container const pages{begin, end};
+
+      for (auto const & page : pages)
+      {
+        active_table.map_page_to_next_free_frame(allocator, page, paging::entry::WRITABLE);
+      }
+    }
+  }  // namespace
+
+  auto initialize_memory_management() -> void
+  {
+    static bool has_been_called = false;
+    arch::exception_handling::assert(!has_been_called,
+                                     "[Initialization] Memory management has already been initialized");
+    has_been_called = true;
+
+    auto const memory_information = multiboot::read_multiboot2();
+    allocator::area_frame_allocator allocator(memory_information);
+
+    cpu::set_cr0_bit(memory::cpu::cr0_flags::WRITE_PROTECT);
+    cpu::set_efer_bit(memory::cpu::efer_flags::NXE);
+
+    paging::kernel_mapper kernel(allocator, memory_information);
+    auto & active_table = kernel.remap_kernel();
+    video::vga::text::write("Kernel remapping successful", video::vga::text::common_attributes::green_on_black);
+    video::vga::text::newline();
+
+    remap_heap(allocator, active_table);
+    video::vga::text::write("Heap remapping successful", video::vga::text::common_attributes::green_on_black);
+    video::vga::text::newline();
+  }
+}  // namespace teachos::arch::memory