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#include "kapi/memory.hpp"
#include "kapi/memory/frame.hpp"
#include "kapi/memory/frame_allocator.hpp"
#include "kapi/system.hpp"
#include "x86_64/boot/boot.hpp"
#include "x86_64/boot/ld.hpp"
#include "x86_64/cpu/impl/control_registers.hpp"
#include "x86_64/cpu/registers.hpp"
#include "x86_64/memory/region_allocator.hpp"
#include <multiboot2/information.hpp>
#include <atomic>
namespace teachos::memory
{
std::size_t const PLATFORM_FRAME_SIZE{4096};
namespace
{
// NOLINTBEGIN(cppcoreguidelines-avoid-non-const-global-variables)
auto constinit is_initialized = std::atomic_flag{};
auto constinit allocator = static_cast<frame_allocator *>(nullptr);
// NOLINTEND(cppcoreguidelines-avoid-non-const-global-variables)
auto create_memory_information() -> x86_64::region_allocator::memory_information
{
auto const & mbi = boot::x86_64::multiboot_information_pointer.get();
return {.image_range = std::make_pair(physical_address{&boot::x86_64::_start_physical},
physical_address{&boot::x86_64::_end_physical}),
.mbi_range = std::make_pair(physical_address{std::bit_cast<std::byte *>(mbi)},
physical_address{std::bit_cast<std::byte *>(mbi) + mbi->size_bytes()}),
.memory_map = mbi->memory_map()};
};
auto create_early_frame_allocator()
{
auto memory_map = boot::x86_64::multiboot_information_pointer->maybe_memory_map();
if (!memory_map)
{
system::panic("[x86_64] Failed to create early allocator, no memory map available.");
}
return x86_64::region_allocator{create_memory_information()};
}
auto enable_cpu_protections() -> void
{
cpu::x86_64::cr0::set(cpu::x86_64::cr0::flags::write_protect);
// set_efer_bit(efer_flags::NXE);
}
} // namespace
auto active_allocator() -> frame_allocator &
{
if (!allocator)
{
system::panic("[x86_64] The frame allocator has not been set yet.");
}
return *allocator;
}
auto init() -> void
{
if (is_initialized.test_and_set())
{
system::panic("[x86_64] Memory management has already been initialized.");
}
[[maybe_unused]] auto allocator = create_early_frame_allocator();
enable_cpu_protections();
// paging::kernel_mapper kernel(allocator, memory_information);
// kernel.remap_kernel();
// video::vga::text::write("Kernel remapping successful", video::vga::text::common_attributes::green_on_black);
// video::vga::text::newline();
// remap_heap(heap::KERNEL_HEAP_START, heap::KERNEL_HEAP_SIZE);
// video::vga::text::write("Heap remapping successful", video::vga::text::common_attributes::green_on_black);
// video::vga::text::newline();
}
} // namespace teachos::memory
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