#include "kapi/acpi.hpp"

#include "arch/boot/boot.hpp"

#include <kstd/memory>

namespace kapi::acpi
{

  auto get_root_pointer() -> kstd::observer_ptr<root_system_description_pointer const>
  {
    auto const & mbi = kapi::boot::bootstrap_information.mbi;
    auto system_description_pointer = static_cast<kapi::acpi::root_system_description_pointer const *>(nullptr);

    if (auto const & xsdp = mbi->maybe_acpi_xsdp())
    {
      auto data = xsdp->pointer().data();

      system_description_pointer = reinterpret_cast<kapi::acpi::root_system_description_pointer const *>(data);
    }
    else if (auto const & rsdp = mbi->maybe_acpi_rsdp())
    {
      auto data = rsdp->pointer().data();
      system_description_pointer = reinterpret_cast<kapi::acpi::root_system_description_pointer const *>(data);
    }

    return kstd::make_observer(system_description_pointer);
  }

}  // namespace kapi::acpi