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#include "arch/memory/main.hpp"
#include "arch/exception_handling/assert.hpp"
#include "arch/kernel/cpu/control_register.hpp"
#include "arch/kernel/cpu/msr.hpp"
#include "arch/memory/allocator/area_frame_allocator.hpp"
#include "arch/memory/allocator/concept.hpp"
#include "arch/memory/heap/heap_allocator.hpp"
#include "arch/memory/paging/active_page_table.hpp"
#include "arch/memory/paging/kernel_mapper.hpp"
namespace teachos::arch::memory
{
namespace
{
template<allocator::FrameAllocator T>
auto create_frame_allocator(multiboot::memory_information const & memory_information) -> T
{
return allocator::area_frame_allocator{memory_information};
}
template<allocator::FrameAllocator T>
auto remap_heap(T & 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 | paging::entry::USER_ACCESSIBLE);
}
}
} // 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();
auto allocator = create_frame_allocator<allocator::area_frame_allocator>(memory_information);
kernel::cpu::set_cr0_bit(kernel::cpu::cr0_flags::WRITE_PROTECT);
kernel::cpu::set_efer_bit(kernel::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
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