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#include "kernel/memory.hpp"
#include "kapi/memory.hpp"
#include "kapi/system.hpp"
#include "kernel/memory/free_list_allocator.hpp"
#include "kernel/memory/heap_allocator.hpp"
#include <atomic>
#include <cstddef>
#include <new>
#include <optional>
namespace kernel::memory
{
namespace
{
struct null_allocator : heap_allocator
{
null_allocator static instance;
[[nodiscard]] auto allocate(std::size_t, std::align_val_t) noexcept -> void * override
{
return nullptr;
}
auto deallocate(void *) noexcept -> void override {}
};
constinit null_allocator null_allocator::instance{};
auto constinit active_heap_allocator = std::optional<heap_allocator *>{&null_allocator::instance};
auto constinit basic_allocator = std::optional<free_list_allocator>{};
} // namespace
auto get_heap_allocator() -> heap_allocator &
{
return *active_heap_allocator.value();
}
auto init_heap(kapi::memory::linear_address base) -> void
{
auto static constinit is_initialized = std::atomic_flag{};
if (is_initialized.test_and_set())
{
kapi::system::panic("[OS] The heap has already been initialized.");
}
auto & instance = basic_allocator.emplace(base);
active_heap_allocator = &instance;
}
} // namespace kernel::memory
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