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Diffstat (limited to 'arch/x86_64/src/memory/main.cpp')
| -rw-r--r-- | arch/x86_64/src/memory/main.cpp | 47 |
1 files changed, 47 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..ce07115 --- /dev/null +++ b/arch/x86_64/src/memory/main.cpp @@ -0,0 +1,47 @@ +#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/allocator.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 heap_start_page = paging::virtual_page::containing_address(memory::heap::HEAP_START); + auto heap_end_page = + paging::virtual_page::containing_address(memory::heap::HEAP_START + memory::heap::HEAP_SIZE - 1); + + for (auto i = heap_start_page.page_number; i <= heap_end_page.page_number; i++) + { + active_table.map_page_to_next_free_frame(allocator, paging::virtual_page{i}, 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_cr2_bit(memory::cpu::cr2_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 successfull", video::vga::text::common_attributes::green_on_black); + + remap_heap(allocator, active_table); + } +} // namespace teachos::arch::memory
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